1News for the tz database 2 3Release 2019b - 2019-07-01 00:09:53 -0700 4 5 Briefly: 6 Brazil no longer observes DST. 7 'zic -b slim' outputs smaller TZif files; please try it out. 8 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 9 10 Changes to future timestamps 11 12 Brazil has canceled DST and will stay on standard time indefinitely. 13 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 14 Oliveira.) 15 16 Predictions for Morocco now go through 2087 instead of 2037, to 17 work around a problem on newlib when using TZif files output by 18 zic 2019a or earlier. (Problem reported by David Gauchard.) 19 20 Changes to past and future timestamps 21 22 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 23 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 24 future transitions to be March's last Friday at 00:00. 25 26 Changes to past timestamps 27 28 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 29 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 30 not 09-15 at 00:00. In 1946 its spring-forward transition was on 31 04-21 at 00:00, not the previous day at 03:30. From 1946 through 32 1952 its fall-back transitions occurred at 04:30, not at 03:30. 33 In 1947 its fall-back transition was on 11-30, not 12-30. 34 (Thanks to P Chan.) 35 36 Changes to past time zone abbreviations 37 38 Italy's 1866 transition to Rome Mean Time was on December 12, not 39 September 22. This affects only the time zone abbreviation for 40 Europe/Rome between those dates. (Thanks to Stephen Trainor and 41 Luigi Rosa.) 42 43 Changes affecting metadata only 44 45 Add info about the Crimea situation in zone1970.tab and zone.tab. 46 (Problem reported by Serhii Demediuk.) 47 48 Changes to code 49 50 zic's new -b option supports a way to control data bloat and to 51 test for year-2038 bugs in software that reads TZif files. 52 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 53 for example, changing from fat to slim shrinks the Europe/London 54 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 55 files represent the same set of timestamps and use the same TZif 56 format as documented in tzfile(5) and in Internet RFC 8536. 57 Fat format attempts to work around bugs or incompatibilities in 58 older software, notably software that mishandles 64-bit TZif data 59 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 60 Slim format is more efficient and does not work around 64-bit bugs 61 or obsolete TZ strings. Currently zic defaults to fat format 62 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 63 out-of-the-box default is intended to change in future releases 64 as the buggy software often mishandles timestamps anyway. 65 66 zic no longer treats a set of rules ending in 2037 specially. 67 Previously, zic assumed that such a ruleset meant that future 68 timestamps could not be predicted, and therefore omitted a 69 POSIX-like TZ string in the TZif output. The old behavior is no 70 longer needed for current tzdata, and caused problems with newlib 71 when used with older tzdata (reported by David Gauchard). 72 73 zic no longer generates some artifact transitions. For example, 74 Europe/London no longer has a no-op transition in January 1996. 75 76 Changes to build procedure 77 78 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 79 by a percent or so. 80 81 Changes to documentation and commentary 82 83 The Makefile now documents the POSIXRULES macro as being obsolete, 84 and similarly, zic's -p POSIXRULES option is now documented as 85 being obsolete. Although the POSIXRULES feature still exists and 86 works as before, in practice it is rarely used for its intended 87 purpose, and it does not work either in the default reference 88 implementation (for timestamps after 2037) or in common 89 implementations such as GNU/Linux (for contemporary timestamps). 90 Since POSIXRULES was designed primarily as a temporary transition 91 facility for System V platforms that died off decades ago, it is 92 being decommissioned rather than institutionalized. 93 94 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 95 96 97Release 2019a - 2019-03-25 22:01:33 -0700 98 99 Briefly: 100 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 101 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 102 103 Changes to past and future timestamps 104 105 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 106 previously predicted. Adjust our prediction by guessing that spring 107 transitions will be between 24 and 30 March, which matches recent practice 108 since 2016. (Thanks to Even Scharning and Tim Parenti.) 109 110 Metlakatla ended its observance of Pacific standard time, 111 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 112 Stanley and Tim Parenti.) 113 114 Changes to past timestamps 115 116 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 117 (Thanks to Alois Treindl and Isaac Starkman.) 118 119 Changes to time zone abbreviations 120 121 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 122 of being a separate zone that generates the abbreviation "UCT", 123 which nowadays is typically a typo. (Problem reported by Isiah 124 Meadows.) 125 126 Changes to code 127 128 zic now has an -r option to limit the time range of output data. 129 For example, 'zic -r @1000000000' limits the output data to 130 timestamps starting 1000000000 seconds after the Epoch. 131 This helps shrink output size and can be useful for applications 132 not needing the full timestamp history, such as TZDIST truncation; 133 see Internet RFC 8536 section 5.1. (Inspired by a feature request 134 from Christopher Wong, helped along by bug reports from Wong and 135 from Tim Parenti.) 136 137 Changes to documentation 138 139 Mention Internet RFC 8536 (February 2019), which documents TZif. 140 141 tz-link.html now cites tzdata-meta 142 <https://tzdata-meta.timtimeonline.com/>. 143 144 145Release 2018i - 2018-12-30 11:05:43 -0800 146 147 Briefly: 148 São Tomé and Príncipe switches from +01 to +00 on 2019-01-01. 149 150 Changes to future timestamps 151 152 Due to a change in government, São Tomé and Príncipe switches back 153 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 154 Nasardinov and Michael Deckers.) 155 156 157Release 2018h - 2018-12-23 17:59:32 -0800 158 159 Briefly: 160 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 161 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 162 Metlakatla, Alaska observes PST this winter only. 163 Guess Morocco will continue to adjust clocks around Ramadan. 164 Add predictions for Iran from 2038 through 2090. 165 166 Changes to future timestamps 167 168 Guess that Morocco will continue to fall back just before and 169 spring forward just after Ramadan, the practice since 2012. 170 (Thanks to Maamar Abdelkader.) This means Morocco will observe 171 negative DST during Ramadan in main and vanguard formats, and in 172 rearguard format it stays in the +00 timezone and observes 173 ordinary DST in all months other than Ramadan. As before, extend 174 this guesswork to the year 2037. As a consequence, Morocco is 175 scheduled to observe three DST transitions in some Gregorian years 176 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 177 calendars. 178 179 The table of exact transitions for Iranian DST has been extended. 180 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 181 It now cuts off before 2091 as there is doubt about how the Persian 182 calendar will treat 2091. This change predicts DST transitions in 183 2038-9, 2042-3, and 2046-7 to occur one day later than previously 184 predicted. As before, post-cutoff transitions are approximated. 185 186 Changes to past and future timestamps 187 188 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 189 +05 on 2018-12-21. This is a zone split as Qostanay (aka 190 Kostanay) did not switch, so create a zone Asia/Qostanay. 191 192 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 193 It did not change clocks that day and remains on -08 this winter. 194 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 195 rules next spring, so this change affects only timestamps 196 from 2018-11-04 through 2019-03-10. 197 198 Change to past timestamps 199 200 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 201 not 00:00. I transcribed the time incorrectly from Shanks. 202 (Thanks to Phake Nick.) 203 204 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 205 (Thanks to Phake Nick.) 206 207 Guam observed DST irregularly from 1959 through 1977. 208 (Thanks to Phake Nick.) 209 210 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 211 10-01 changed standard time to +08:30 (not +08). Its transition 212 back to +08 after WWII was on 1945-09-15, not the previous day. 213 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 214 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 215 its 1952 fallback was on 11-02 (not 10-25). 216 217 This release contains many changes to timestamps before 1946 due 218 to Japanese possession or occupation of Pacific/Chuuk, 219 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 220 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 221 (Thanks to Phake Nick.) 222 223 Assume that the Spanish East Indies was like the Philippines and 224 observed American time until the end of 1844. This affects 225 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 226 227 Changes to past tm_isdst flags 228 229 For the recent Morocco change, the tm_isdst flag should be 1 from 230 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 231 Give a URL to the official decree. (Thanks to Matt Johnson.) 232 233 234Release 2018g - 2018-10-26 22:22:45 -0700 235 236 Briefly: 237 Morocco switches to permanent +01 on 2018-10-28. 238 239 Changes to future timestamps 240 241 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 242 so its clocks will not fall back as previously scheduled. 243 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 244 245 Changes to code 246 247 When generating TZif files with leap seconds, zic no longer uses a 248 format that trips up older 32-bit clients, fixing a bug introduced 249 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 250 for QTBUG-53071 now also works for TZif files with leap seconds. 251 252 The translator to rearguard format now rewrites the line 253 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 254 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 255 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 256 and earlier. (Reported by Christos Zoulas.) 257 258 Changes to past time zone abbreviations 259 260 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 261 This reverts to 2011h, as the abbreviation change in 2011i was 262 likely inadvertent. 263 264 Changes to documentation 265 266 tzfile.5 has new sections on interoperability issues. 267 268 269Release 2018f - 2018-10-18 00:14:18 -0700 270 271 Briefly: 272 Volgograd moves from +03 to +04 on 2018-10-28. 273 Fiji ends DST 2019-01-13, not 2019-01-20. 274 Most of Chile changes DST dates, effective 2019-04-06. 275 276 Changes to future timestamps 277 278 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 279 (Thanks to Alexander Fetisov and Stepan Golosunov.) 280 281 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 282 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 283 accordingly. 284 285 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 286 time, and resume DST on the first Saturday in September at 24:00 mainland 287 time. The changes are effective from 2019-04-06, and do not affect the 288 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 289 and Tim Parenti.) Adjust future predictions accordingly. 290 291 Changes to past timestamps 292 293 The 2018-05-05 North Korea 30-minute time zone change took place 294 at 23:30 the previous day, not at 00:00 that day. 295 296 China's 1988 spring-forward transition was on April 17, not 297 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 298 (Thanks to P Chan.) 299 300 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 301 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 302 temporarily switched to +09/+10 during World War II. Macau 303 observed DST in 1942/79, not 1961/80, and there were several 304 errors for transition times and dates. (Thanks to P Chan.) 305 306 The 1948-1951 fallback transitions in Japan were at 25:00 on 307 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 308 zic turns this into 01:00 on the day after September's second 309 Saturday, which is the best that POSIX or C platforms can do. 310 311 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 312 paper by Li Yu, replacing more-questionable data from Shanks. 313 314 Changes to time zone abbreviations 315 316 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 317 318 Changes to code 319 320 zic now always generates TZif files where time type 0 is used for 321 timestamps before the first transition. This simplifies the 322 reading of TZif files and should not affect behavior of existing 323 TZif readers because the same set of time types is used; only 324 their internal indexes may have changed. This affects only the 325 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 326 EET, which previously used nonzero types for these timestamps. 327 328 Because of the type 0 change, zic no longer outputs a dummy 329 transition at time -2**59 (before the Big Bang), as clients should 330 no longer need this to handle historical timestamps correctly. 331 This reverts a change introduced in 2013d and shrinks most TZif 332 files by a few bytes. 333 334 zic now supports negative time-of-day in Rule and Leap lines, e.g., 335 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 336 occurs at 18:00 on the Saturday before the last Sunday in April. 337 This behavior was documented in 2018a but the code did not 338 entirely match the documentation. 339 340 localtime.c no longer requires at least one time type in TZif 341 files that lack transitions or have a POSIX-style TZ string. This 342 future-proofs the code against possible future extensions to the 343 format that would allow TZif files with POSIX-style TZ strings and 344 without transitions or time types. 345 346 A read-access subscript error in localtime.c has been fixed. 347 It could occur only in TZif files with timecnt == 0, something that 348 does not happen in practice now but could happen in future versions. 349 350 localtime.c no longer ignores TZif POSIX-style TZ strings that 351 specify only standard time. Instead, these TZ strings now 352 override the default time type for timestamps after the last 353 transition (or for all timestamps if there are no transitions), 354 just as DST strings specifying DST have always done. 355 356 leapseconds.awk now outputs "#updated" and "#expires" comments, 357 and supports leap seconds at the ends of months other than June 358 and December. (Inspired by suggestions from Chris Woodbury.) 359 360 Changes to documentation 361 362 New restrictions: A Rule name must start with a character that 363 is neither an ASCII digit nor "-" nor "+", and an unquoted name 364 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 365 The latter restriction makes room for future extensions (a 366 possibility noted by Tom Lane). 367 368 tzfile.5 now documents what time types apply before the first and 369 after the last transition, if any. 370 371 Documentation now uses the spelling "timezone" for a TZ setting 372 that determines timestamp history, and "time zone" for a 373 geographic region currently sharing the same standard time. 374 375 The name "TZif" is now used for the tz binary data format. 376 377 tz-link.htm now mentions the A0 TimeZone Migration utilities. 378 (Thanks to Aldrin Martoq for the link.) 379 380 Changes to build procedure 381 382 New 'make' target 'rearguard_tarballs' to build the rearguard 383 tarball only. This is a convenience on platforms that lack lzip 384 if you want to build the rearguard tarball. (Problem reported by 385 Deborah Goldsmith.) 386 387 tzdata.zi is now more stable from release to release. (Problem 388 noted by Tom Lane.) It is also a bit shorter. 389 390 tzdata.zi now can contain comment lines documenting configuration 391 information, such as which data format was selected, which input 392 files were used, and how leap seconds are treated. (Problems 393 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 394 are used these comment lines are absent, for backward 395 compatibility. A redistributor intending to alter its copy of the 396 files should also append "-LABEL" to the 'version' file's first 397 line, where "LABEL" identifies the redistributor's change. 398 399 400Release 2018e - 2018-05-01 23:42:51 -0700 401 402 Briefly: 403 404 North Korea switches back to +09 on 2018-05-05. 405 The main format uses negative DST again, for Ireland etc. 406 'make tarballs' now also builds a rearguard tarball. 407 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 408 409 Changes to past and future timestamps 410 411 North Korea switches back from +0830 to +09 on 2018-05-05. 412 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 413 and Tim Parenti.) 414 415 Bring back the negative-DST changes of 2018a, except be more 416 compatible with data parsers that do not support negative DST. 417 Also, this now affects historical timestamps in Namibia and the 418 former Czechoslovakia, not just Ireland. The main format now uses 419 negative DST to model timestamps in Europe/Dublin (from 1971 on), 420 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 421 does not affect UT offsets, only time zone abbreviations and the 422 tm_isdst flag. Also, this does not affect rearguard or vanguard 423 formats; effectively the main format now uses vanguard instead of 424 rearguard format. Data parsers that do not support negative DST 425 can still use data from the rearguard tarball described below. 426 427 Changes to build procedure 428 429 The command 'make tarballs' now also builds the tarball 430 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 431 except that it uses rearguard format intended for trailing-edge 432 data parsers. 433 434 Changes to data format and to code 435 436 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 437 suffix, which specifies whether the adjusted time is standard time 438 or daylight saving time. If no suffix is given, daylight saving 439 time is used if and only if the SAVE column is nonzero; this is 440 the longstanding behavior. Although this new feature is not used 441 in tzdata, it could be used to specify the legal time in Namibia 442 1994-2017, as opposed to the popular time (see below). 443 444 Changes to past timestamps 445 446 From 1994 through 2017 Namibia observed DST in winter, not summer. 447 That is, it used negative DST, as Ireland still does. This change 448 does not affect UTC offsets; it affects only the tm_isdst flag and 449 the abbreviation used during summer, which is now CAT, not WAST. 450 Although (as noted by Michael Deckers) summer and winter time were 451 both simply called "standard time" in Namibian law, in common 452 practice winter time was considered to be DST (as noted by Stephen 453 Colebourne). The full effect of this change is only in vanguard 454 and main format; in rearguard format, the tm_isdst flag is still 455 zero in winter and nonzero in summer. 456 457 In 1946/7 Czechoslovakia also observed negative DST in winter. 458 The full effect of this change is only in vanguard and main 459 formats; in rearguard format, it is modeled as plain GMT without 460 daylight saving. Also, the dates of some 1944/5 DST transitions 461 in Czechoslovakia have been changed. 462 463 464Release 2018d - 2018-03-22 07:05:46 -0700 465 466 Briefly: 467 468 Palestine starts DST a week earlier in 2018. 469 Add support for vanguard and rearguard data consumers. 470 Add subsecond precision to source data format, though not to data. 471 472 Changes to future timestamps 473 474 In 2018, Palestine starts DST on March 24, not March 31. 475 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 476 477 Changes to past and future timestamps 478 479 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 480 at 04:00. (Thanks to Steffen Thorsen.) 481 482 Changes to past timestamps 483 484 Historical transitions for Uruguay, represented by 485 America/Montevideo, have been updated per official legal documents, 486 replacing previous data mainly originating from the inventions of 487 Shanks & Pottenger. This has resulted in adjustments ranging from 488 30 to 90 minutes in either direction over at least two dozen 489 distinct periods ranging from one day to several years in length. 490 A mere handful of pre-1991 transitions are unaffected; data since 491 then has come from more reliable contemporaneous reporting. These 492 changes affect various timestamps in 1920-1923, 1936, 1939, 493 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 494 Additionally, Uruguay's pre-standard-time UT offset has been 495 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 496 match the location of the Observatory of the National Meteorological 497 Institute in Montevideo. 498 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 499 500 Enderbury and Kiritimati skipped New Year's Eve 1994, not 501 New Year's Day 1995. (Thanks to Kerry Shetline.) 502 503 Fix the 1912-01-01 transition for Portugal and its colonies. 504 This transition was at 00:00 according to the new UT offset, not 505 according to the old one. Also assume that Cape Verde switched on 506 the same date as the rest, not in 1907. This affects 507 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 508 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 509 (Thanks to Michael Deckers.) 510 511 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 512 Turks & Caicos. 513 514 Changes to past time zone abbreviations 515 516 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 517 is no clock change associated with the transition. 518 519 Changes to build procedure 520 521 The new DATAFORM macro in the Makefile lets the installer choose 522 among three source data formats. The idea is to lessen downstream 523 disruption when data formats are improved. 524 525 * DATAFORM=vanguard installs from the latest, bleeding-edge 526 format. DATAFORM=main (the default) installs from the format 527 used in the 'africa' etc. files. DATAFORM=rearguard installs 528 from a trailing-edge format. Eventually, elements of today's 529 vanguard format should move to the main format, and similarly 530 the main format's features should eventually move to the 531 rearguard format. 532 533 * In the current version, the main and rearguard formats are 534 identical and match that of 2018c, so this change does not 535 affect default behavior. The vanguard format currently contains 536 one feature not in the main format: negative SAVE values. This 537 improves support for Ireland, which uses Irish Standard Time 538 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 539 supported negative SAVE values for decades, and this feature 540 should move to the main format soon. However, it will not move 541 to the rearguard format for quite some time because some 542 downstream parsers do not support it. 543 544 * The build procedure constructs three files vanguard.zi, main.zi, 545 and rearguard.zi, one for each format. Although the files 546 represent essentially the same data, they may have minor 547 discrepancies that users are not likely to notice. The files 548 are intended for downstream data consumers and are not 549 installed. Zoneinfo parsers that do not support negative SAVE values 550 should start using rearguard.zi, so that they will be unaffected 551 when the negative-DST feature moves from vanguard to main. 552 Bleeding-edge Zoneinfo parsers that support the new features 553 already can use vanguard.zi; in this respect, current tzcode is 554 bleeding-edge. 555 556 The Makefile should now be safe for parallelized builds, and 'make 557 -j to2050new.tzs' is now much faster on a multiprocessor host 558 with GNU Make. 559 560 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 561 prepends TZDIR/ to file names that do not begin with '/'. This is 562 not recommended for general use, due to its security implications. 563 (From a suggestion by Manuela Friedrich.) 564 565 Changes to code 566 567 zic now accepts subsecond precision in expressions like 568 00:19:32.13, which is approximately the legal time of the 569 Netherlands from 1835 to 1937. However, because it is 570 questionable whether the few recorded uses of non-integer offsets 571 had subsecond precision in practice, there are no plans for tzdata 572 to use this feature. (Thanks to Steve Allen for pointing out 573 the limitations of historical data in this area.) 574 575 The code is a bit more portable to MS-Windows. Installers can 576 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 577 reserve identifiers like 'localtime'. (Thanks to Manuela 578 Friedrich.) 579 580 Changes to documentation and commentary 581 582 theory.html now outlines tzdb's extensions to POSIX's model for 583 civil time, and has a section "POSIX features no longer needed" 584 that lists POSIX API components that are now vestigial. 585 (From suggestions by Steve Summit.) It also better distinguishes 586 time zones from tz regions. (From a suggestion by Guy Harris.) 587 588 Commentary is now more consistent about using the phrase "daylight 589 saving time", to match the C name tm_isdst. Daylight saving time 590 need not occur in summer, and need not have a positive offset from 591 standard time. 592 593 Commentary about historical transitions in Uruguay has been expanded 594 with links to many relevant legal documents. 595 (Thanks to Tim Parenti.) 596 597 Commentary now uses some non-ASCII characters with Unicode value 598 less than U+0100, as they can be useful and should work even with 599 older editors such as XEmacs. 600 601 602Release 2018c - 2018-01-22 23:00:44 -0800 603 604 Briefly: 605 Revert Irish changes that relied on negative SAVE values. 606 607 Changes to tm_isdst 608 609 Revert the 2018a change to Europe/Dublin. As before, this change 610 does not affect UT offsets or abbreviations; it affects only 611 whether timestamps are considered to be standard time or 612 daylight-saving time, as expressed in the tm_isdst flag of C's 613 struct tm type. This reversion is intended to be a temporary 614 workaround for problems discovered with downstream uses of 615 releases 2018a and 2018b, which implemented Irish time by using 616 negative SAVE values in the Eire rules of the 'europe' file. 617 Although negative SAVE values have been part of tzcode for many 618 years and are supported by many platforms, they were not 619 documented before 2018a and ICU and OpenJDK do not currently 620 support them. A mechanism to export data to platforms lacking 621 support for negative DST is planned to be developed before the 622 change is reapplied. (Problems reported by Deborah Goldsmith and 623 Stephen Colebourne.) 624 625 Changes to past timestamps 626 627 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 628 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 629 630 Changes to build procedure 631 632 The build procedure now works around mawk 1.3.3's lack of support 633 for character class expressions. (Problem reported by Ohyama.) 634 635 636Release 2018b - 2018-01-17 23:24:48 -0800 637 638 Briefly: 639 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 640 641 Changes to build procedure 642 643 The distribution now contains the file 'pacificnew' again. 644 This file was inadvertantly omitted in the 2018a distribution. 645 (Problem reported by Matias Fonzo.) 646 647 648Release 2018a - 2018-01-12 22:29:21 -0800 649 650 Briefly: 651 São Tomé and Príncipe switched from +00 to +01. 652 Brazil's DST will now start on November's first Sunday. 653 Ireland's standard time is now in the summer, not the winter. 654 Use Debian-style installation locations, instead of 4.3BSD-style. 655 New zic option -t. 656 657 Changes to past and future timestamps 658 659 São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at 660 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 661 662 Changes to future timestamps 663 664 Starting in 2018 southern Brazil will begin DST on November's 665 first Sunday instead of October's third Sunday. (Thanks to 666 Steffen Thorsen.) 667 668 Changes to past timestamps 669 670 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 671 been corrected. The 'backzone' and 'zone.tab' files did not agree 672 with the 'africa' and 'zone1970.tab' files. (Problem reported by 673 Michael Deckers.) 674 675 The abbreviation invented for Bolivia Summer Time (1931-2) is now 676 BST instead of BOST, to be more consistent with the convention 677 used for Latvian Summer Time (1918-9) and for British Summer Time. 678 679 Changes to tm_isdst 680 681 Change Europe/Dublin so that it observes Irish Standard Time (UT 682 +01) in summer and GMT (as negative daylight-saving) in winter, 683 instead of observing standard time (GMT) in winter and Irish 684 Summer Time (UT +01) in summer. This change does not affect UT 685 offsets or abbreviations; it affects only whether timestamps are 686 considered to be standard time or daylight-saving time, as 687 expressed in the tm_isdst flag of C's struct tm type. 688 (Discrepancy noted by Derick Rethans.) 689 690 Changes to build procedure 691 692 The default installation locations have been changed to mostly 693 match Debian circa 2017, instead of being designed as an add-on to 694 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 695 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 696 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 697 locations more precisely. (This responds to suggestions from 698 Brian Inglis and from Steve Summit.) 699 700 The default installation procedure no longer creates the 701 backward-compatibility link US/Pacific-New, which causes 702 confusion during user setup (e.g., see Debian bug 815200). 703 Use 'make BACKWARD="backward pacificnew"' to create the link 704 anyway, for now. Eventually we plan to remove the link entirely. 705 706 tzdata.zi now contains a version-number comment. 707 (Suggested by Tom Lane.) 708 709 The Makefile now quotes values like BACKWARD more carefully when 710 passing them to the shell. (Problem reported by Zefram.) 711 712 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 713 that have snprintf and use pre-C99 compilers. (Problem reported 714 by Jon Skeet.) 715 716 Changes to code 717 718 zic has a new option -t FILE that specifies the location of the 719 file that determines local time when TZ is unset. The default for 720 this location can be configured via the new TZDEFAULT makefile 721 macro, which defaults to /etc/localtime. 722 723 Diagnostics and commentary now distinguish UT from UTC more 724 carefully; see theory.html for more information about UT vs UTC. 725 726 zic has been ported to GCC 8's -Wstringop-truncation option. 727 (Problem reported by Martin Sebor.) 728 729 Changes to documentation and commentary 730 731 The zic man page now documents the longstanding behavior that 732 times and years can be out of the usual range, with negative times 733 counting backwards from midnight and with year 0 preceding year 1. 734 (Problem reported by Michael Deckers.) 735 736 The theory.html file now mentions the POSIX limit of six chars 737 per abbreviation, and lists alphabetic abbreviations used. 738 739 The files tz-art.htm and tz-link.htm have been renamed to 740 tz-art.html and tz-link.html, respectively, for consistency with 741 other file names and to simplify web server configuration. 742 743 744Release 2017c - 2017-10-20 14:49:34 -0700 745 746 Briefly: 747 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 748 Fiji ends DST 2018-01-14, not 2018-01-21. 749 Namibia switches from +01/+02 to +02 on 2018-04-01. 750 Sudan switches from +03 to +02 on 2017-11-01. 751 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 752 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 753 A new file tzdata.zi now holds a small text copy of all data. 754 The zic input format has been regularized slightly. 755 756 Changes to future timestamps 757 758 Northern Cyprus has decided to resume EU rules starting 759 2017-10-29, thus reinstituting winter time. 760 761 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 762 predicted. (Thanks to Dominic Fok.) Adjust future predictions 763 accordingly. 764 765 Namibia will switch from +01 with DST to +02 all year on 766 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 767 at 02:00. (Thanks to Steffen Thorsen.) 768 769 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 770 Atyya and Yahia Abdalla.) South Sudan is not switching, so 771 Africa/Juba is no longer a link to Africa/Khartoum. 772 773 Tonga has likely ended its experiment with DST, and will not 774 adjust its clocks on 2017-11-05. Although Tonga has not announced 775 whether it will continue to observe DST, the IATA is assuming that 776 it will not. (Thanks to David Wade.) 777 778 Turks & Caicos will switch from -04 all year to -05 with US DST on 779 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 780 at 02:00. (Thanks to Steffen Thorsen.) 781 782 Changes to past timestamps 783 784 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 785 (Thanks to Arthur David Olson.) 786 787 Detroit did not observe DST in 1967. 788 789 Use railway time for Asia/Kolkata before 1941, by switching to 790 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 791 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 792 793 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 794 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 795 796 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 797 American time in 1892, not 1879. (Thanks to Michael Deckers.) 798 799 Adjust the 1867 transition in Alaska to better reflect the 800 historical record, by changing it to occur on 1867-10-18 at 15:30 801 Sitka time rather than at the start of 1867-10-17 local time. 802 Although strictly speaking this is accurate only for Sitka, 803 the rest of Alaska's blanks need to be filled in somehow. 804 805 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 806 (Thanks to Michael Deckers.) 807 808 Add 7 s to the UT offset in Asia/Yangon before 1920. 809 810 Changes to zone names 811 812 Remove Canada/East-Saskatchewan from the 'backward' file, as it 813 exceeded the 14-character limit and was an unused misnomer anyway. 814 815 Changes to build procedure 816 817 To support applications that prefer to read time zone data in text 818 form, two zic input files tzdata.zi and leapseconds are now 819 installed by default. The commands 'zic tzdata.zi' and 'zic -L 820 leapseconds tzdata.zi' can reproduce the tzdata binary files 821 without and with leap seconds, respectively. To prevent these two 822 new files from being installed, use 'make TZDATA_TEXT=', and to 823 suppress leap seconds from the tzdata text installation, use 'make 824 TZDATA_TEXT=tzdata.zi'. 825 826 'make BACKWARD=' now suppresses backward-compatibility names 827 like 'US/Pacific' that are defined in the 'backward' and 828 'pacificnew' files. 829 830 'make check' now works on systems that lack a UTF-8 locale, 831 or that lack the nsgmls program. Set UTF8_LOCALE to configure 832 the name of a UTF-8 locale, if you have one. 833 834 Y2K runtime checks are no longer enabled by default. Add 835 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 836 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 837 to disable them. (New name suggested by Brian Inglis.) 838 839 The build procedure for zdump now works on AIX 7.1. 840 (Problem reported by Kees Dekker.) 841 842 Changes to code 843 844 zic and the reference runtime now reject multiple leap seconds 845 within 28 days of each other, or leap seconds before the Epoch. 846 As a result, support for double leap seconds, which was 847 obsolescent and undocumented, has been removed. Double leap 848 seconds were an error in the C89 standard; they have never existed 849 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 850 noticing glitches in the code that uncovered this problem.) 851 852 zic now warns about use of the obsolescent and undocumented -y 853 option, and about use of the obsolescent TYPE field of Rule lines. 854 855 zic now allows unambiguous abbreviations like "Sa" and "Su" for 856 weekdays; formerly it rejected them due to a bug. Conversely, zic 857 no longer considers non-prefixes to be abbreviations; for example, 858 it no longer accepts "lF" as an abbreviation for "lastFriday". 859 Also, zic warns about the undocumented usage with a "last-" 860 prefix, e.g., "last-Fri". 861 862 Similarly, zic now accepts the unambiguous abbreviation "L" for 863 "Link" in ordinary context and for "Leap" in leap-second context. 864 Conversely, zic no longer accepts non-prefixes such as "La" as 865 abbreviations for words like "Leap". 866 867 zic no longer accepts leap second lines in ordinary input, or 868 ordinary lines in leap second input. Formerly, zic sometimes 869 warned about this undocumented usage and handled it incorrectly. 870 871 The new macro HAVE_TZNAME governs whether the tzname external 872 variable is exported, instead of USG_COMPAT. USG_COMPAT now 873 governs only the external variables "timezone" and "daylight". 874 This change is needed because the three variables are not in the 875 same category: although POSIX requires tzname, it specifies the 876 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 877 if not defined, the code attempts to guess it from other macros. 878 879 localtime.c and difftime.c no longer require stdio.h, and .c files 880 other than zic.c no longer require sys/wait.h. 881 882 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 883 884 Calculation of time_t extrema works around a bug in GCC 4.8.4 885 (Reported by Stan Shebs and Joseph Myers.) 886 887 zic.c no longer mistranslates formats of line numbers in non-English 888 locales. (Problem reported by Benno Schulenberg.) 889 890 Several minor changes have been made to the code to make it a 891 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 892 Dekker for reporting the problems.) 893 894 Changes to documentation and commentary 895 896 The two new files 'theory.html' and 'calendars' contain the 897 contents of the removed file 'Theory'. The goal is to document 898 tzdb theory more accessibly. 899 900 The zic man page now documents abbreviation rules. 901 902 tz-link.htm now covers how to apply tzdata changes to clients. 903 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL. 904 905 The leap-seconds.list URL has been updated to something that is 906 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 907 908Release 2017b - 2017-03-17 07:30:38 -0700 909 910 Briefly: Haiti has resumed DST. 911 912 Changes to past and future timestamps 913 914 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 915 916 Changes to past timestamps 917 918 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 919 920 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 921 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 922 923 Changes to code 924 925 The reference localtime implementation now falls back on the 926 current US daylight-saving transition rules rather than the 927 1987-2006 rules. This fallback occurs only when (1) the TZ 928 environment variable has a value like "AST4ADT" that asks 929 for daylight saving time but does not specify the rules, (2) there 930 is no file by that name, and (3) the TZDEFRULES file cannot be 931 loaded. (Thanks to Tom Lane.) 932 933 934Release 2017a - 2017-02-28 00:05:36 -0800 935 936 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 937 discontinues DST. 938 939 Changes to future timestamps 940 941 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 942 943 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 944 Its clocks diverge from America/Santiago starting 2017-05-13 at 945 23:00, hiving off a new zone America/Punta_Arenas. Although the 946 Chilean government says this change expires in May 2019, for now 947 assume it's permanent. (Thanks to Juan Correa and Deborah 948 Goldsmith.) This also affects Antarctica/Palmer. 949 950 Changes to past timestamps 951 952 Fix many entries for historical timestamps for Europe/Madrid 953 before 1979, to agree with tables compiled by Pere Planesas of the 954 National Astronomical Observatory of Spain. As a side effect, 955 this changes some timestamps for Africa/Ceuta before 1929, which 956 are probably guesswork anyway. (Thanks to Steve Allen and 957 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 958 correcting the 1901 transition.) 959 960 Ecuador observed DST from 1992-11-28 to 1993-02-05. 961 (Thanks to Alois Treindl.) 962 963 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 964 (Thanks to Stepan Golosunov.) 965 966 Changes to past and future time zone abbreviations 967 968 Switch to numeric time zone abbreviations for South America, as 969 part of the ongoing project of removing invented abbreviations. 970 This avoids the need to invent an abbreviation for the new Chilean 971 new zone. Similarly, switch from invented to numeric time zone 972 abbreviations for Afghanistan, American Samoa, the Azores, 973 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 974 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 975 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 976 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 977 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 978 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 979 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St 980 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 981 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 982 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 983 for half-hour daylight saving time in Belize before 1944 and in 984 the Dominican Republic before 1975; and for Canary Islands before 985 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 986 Indian Summer Time before 1942, for Indonesia before around 1964, 987 for Kenya before 1960, for Liberia before 1973, for Madeira before 988 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 989 Pakistan before 1971, for Western Sahara before 1977, and for 990 Zaporozhye in 1880-1924. 991 992 For Alaska time from 1900 through 1967, instead of "CAT" use the 993 abbreviation "AST", the abbreviation commonly used at the time 994 (Atlantic Standard Time had not been standardized yet). Use "AWT" 995 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 996 997 Use "CST" and "CDT" instead of invented abbreviations for Macau 998 before 1999 and Taiwan before 1938, and use "JST" instead of the 999 invented abbreviation "JCST" for Japan and Korea before 1938. 1000 1001 Change to database entry category 1002 1003 Move the Pacific/Johnston link from 'australasia' to 'backward', 1004 since Johnston is now uninhabited. 1005 1006 Changes to code 1007 1008 zic no longer mishandles some transitions in January 2038 when it 1009 attempts to work around Qt bug 53071. This fixes a bug affecting 1010 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 1011 now contains a workaround, useful when loading a file generated by 1012 a buggy zic. (Problem and localtime.c fix reported by Bradley 1013 White.) 1014 1015 zdump -i now outputs non-hour numeric time zone abbreviations 1016 without a colon, e.g., "+0530" rather than "+05:30". This agrees 1017 with zic %z and with common practice, and simplifies auditing of 1018 zdump output. 1019 1020 zdump is now buildable again with -DUSE_LTZ=0. 1021 (Problem reported by Joseph Myers.) 1022 1023 zdump.c now always includes private.h, to avoid code duplication 1024 with private.h. (Problem reported by Kees Dekker.) 1025 1026 localtime.c no longer mishandles early or late timestamps 1027 when TZ is set to a POSIX-style string that specifies DST. 1028 (Problem reported by Kees Dekker.) 1029 1030 date and strftime now cause %z to generate "-0000" instead of 1031 "+0000" when the UT offset is zero and the time zone abbreviation 1032 begins with "-". 1033 1034 Changes to documentation and commentary 1035 1036 The 'Theory' file now better documents choice of historical time 1037 zone abbreviations. (Problems reported by Michael Deckers.) 1038 1039 tz-link.htm now covers leap smearing, which is popular in clouds. 1040 1041 1042Release 2016j - 2016-11-22 23:17:13 -0800 1043 1044 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 1045 1046 Changes to future timestamps 1047 1048 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 1049 This hives off a new zone Europe/Saratov from Europe/Volgograd. 1050 (Thanks to Yuri Konotopov and Stepan Golosunov.) 1051 1052 Changes to past timestamps 1053 1054 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like 1055 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 1056 1999, not fall 1994. (Thanks to Stepan Golosunov.) 1057 1058 Changes to past time zone abbreviations 1059 1060 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 1061 summer time before 1948. The old use of "EET" was a typo. 1062 1063 Changes to code 1064 1065 zic no longer mishandles file systems that lack hard links, fixing 1066 bugs introduced in 2016g. (Problems reported by Tom Lane.) 1067 Also, when the destination already contains symbolic links, zic 1068 should now work better on systems where the 'link' system call 1069 does not follow symbolic links. 1070 1071 Changes to documentation and commentary 1072 1073 tz-link.htm now documents the relationship between release version 1074 numbers and development-repository commit tags. (Suggested by 1075 Paul Koning.) 1076 1077 The 'Theory' file now documents UT. 1078 1079 iso3166.tab now accents "Curaçao", and commentary now mentions 1080 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.) 1081 1082 1083Release 2016i - 2016-11-01 23:19:52 -0700 1084 1085 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 1086 reintroduces DST on 2016-11-06. 1087 1088 Changes to future timestamps 1089 1090 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 1091 2017-01-15 at 03:00. Assume future observances in Tonga will be 1092 from the first Sunday in November through the third Sunday in 1093 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric 1094 time zone abbreviations for this zone. 1095 1096 Changes to past and future timestamps 1097 1098 Northern Cyprus is now +03 year round, causing a split in Cyprus 1099 time zones starting 2016-10-30 at 04:00. This creates a zone 1100 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 1101 1102 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 1103 (Thanks to Steffen Thorsen.) 1104 1105 Changes to past timestamps 1106 1107 Several corrections were made for pre-1975 timestamps in Italy. 1108 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 1109 Europe/Vatican. 1110 1111 First, the 1893-11-01 00:00 transition in Italy used the new UT 1112 offset (+01), not the old (+00:49:56). (Thanks to Michael 1113 Deckers.) 1114 1115 Second, rules for daylight saving in Italy were changed to agree 1116 with Italy's National Institute of Metrological Research (INRiM) 1117 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 1118 Inglis, and Michael Deckers): 1119 1120 The 1916-06-03 transition was at 24:00, not 00:00. 1121 1122 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 1123 00:00, not 01:00. 1124 1125 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 1126 01:00. 1127 1128 The 1944-09-17 transition was at 03:00, not 01:00. This 1129 particular change is taken from Italian law as INRiM's table, 1130 (which says 02:00) appears to have a typo here. Also, keep the 1131 1944-04-03 transition for Europe/Rome, as Rome was controlled by 1132 Germany then. 1133 1134 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 1135 not 00:00. 1136 1137 Changes to code 1138 1139 The code should now be buildable on AmigaOS merely by setting the 1140 appropriate Makefile variables. (From a patch by Carsten Larsen.) 1141 1142 1143Release 2016h - 2016-10-19 23:17:57 -0700 1144 1145 Changes to future timestamps 1146 1147 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 1148 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 1149 future fall transitions will be on the last Saturday of October 1150 at 01:00, which is consistent with predicted spring transitions 1151 on the last Saturday of March. (Thanks to Tim Parenti.) 1152 1153 Changes to past timestamps 1154 1155 In Turkey, transitions in 1986-1990 were at 01:00 standard time 1156 not at 02:00, and the spring 1994 transition was on March 20, not 1157 March 27. (Thanks to Kıvanç Yazan.) 1158 1159 Changes to past and future time zone abbreviations 1160 1161 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 1162 instead of alphabetic ones like "IST" and "LKT". Various 1163 English-language sources use "IST", "LKT" and "SLST", with no 1164 working consensus. (Usage of "SLST" mentioned by Sadika 1165 Sumanapala.) 1166 1167 Changes to code 1168 1169 zic no longer mishandles relativizing file names when creating 1170 symbolic links like /etc/localtime, when these symbolic links 1171 are outside the usual directory hierarchy. This fixes a bug 1172 introduced in 2016g. (Problem reported by Andreas Stieger.) 1173 1174 Changes to build procedure 1175 1176 New rules 'traditional_tarballs' and 'traditional_signatures' for 1177 building just the traditional-format distribution. (Requested by 1178 Deborah Goldsmith.) 1179 1180 The file 'version' is now put into the tzdata tarball too. 1181 (Requested by Howard Hinnant.) 1182 1183 Changes to documentation and commentary 1184 1185 The 'Theory' file now has a section on interface stability. 1186 (Requested by Paul Koning.) It also mentions features like 1187 tm_zone and localtime_rz that have long been supported by the 1188 reference code. 1189 1190 tz-link.htm has improved coverage of time zone boundaries suitable 1191 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 1192 Johnson.) 1193 1194 The US commentary now mentions Allen and the "day of two noons". 1195 1196 The Fiji commentary mentions the government's 2016-10-03 press 1197 release. (Thanks to Raymond Kumar.) 1198 1199 1200Release 2016g - 2016-09-13 08:56:38 -0700 1201 1202 Changes to future timestamps 1203 1204 Turkey switched from EET/EEST (+02/+03) to permanent +03, 1205 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 1206 than an invented abbreviation for the new time. 1207 1208 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 1209 (Thanks to Tim Parenti.) 1210 1211 Changes to past timestamps 1212 1213 For America/Los_Angeles, spring-forward transition times have been 1214 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 1215 1950-1966. 1216 1217 For zones using Soviet time on 1919-07-01, transitions to UT-based 1218 time were at 00:00 UT, not at 02:00 local time. The affected 1219 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 1220 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 1221 1222 Changes to past and future time zone abbreviations 1223 1224 The Factory zone now uses the time zone abbreviation -00 instead 1225 of a long English-language string, as -00 is now the normal way to 1226 represent an undefined time zone. 1227 1228 Several zones in Antarctica and the former Soviet Union, along 1229 with zones intended for ships at sea that cannot use POSIX TZ 1230 strings, now use numeric time zone abbreviations instead of 1231 invented or obsolete alphanumeric abbreviations. The affected 1232 zones are Antarctica/Casey, Antarctica/Davis, 1233 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 1234 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 1235 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 1236 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 1237 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 1238 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 1239 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 1240 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 1241 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 1242 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 1243 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 1244 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 1245 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 1246 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 1247 was replaced by +05, whereas MSK and MSD were kept as they are not 1248 our invention and are widely used. 1249 1250 Changes to zone names 1251 1252 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 1253 (Thanks to David Massoud.) 1254 1255 Changes to code 1256 1257 zic no longer generates binary files containing POSIX TZ-like 1258 strings that disagree with the local time type after the last 1259 explicit transition in the data. This fixes a bug with 1260 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 1261 on the reference platform. (Thanks to Alexander Belopolsky for 1262 reporting the bug and suggesting a way forward.) 1263 1264 If the installed localtime and/or posixrules files are symbolic 1265 links, zic now keeps them symbolic links when updating them, for 1266 compatibility with platforms like OpenSUSE where other programs 1267 configure these files as symlinks. 1268 1269 zic now avoids hard linking to symbolic links, avoids some 1270 unnecessary mkdir and stat system calls, and uses shorter file 1271 names internally. 1272 1273 zdump has a new -i option to generate transitions in a 1274 more-compact but still human-readable format. This option is 1275 experimental, and the output format may change in future versions. 1276 (Thanks to Jon Skeet for suggesting that an option was needed, 1277 and thanks to Tim Parenti and Chris Rovick for further comments.) 1278 1279 Changes to build procedure 1280 1281 An experimental distribution format is available, in addition 1282 to the traditional format which will continue to be distributed. 1283 The new format is a tarball tzdb-VERSION.tar.lz with signature 1284 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 1285 tzdb-VERSION containing the code and data of the traditional 1286 two-tarball format, along with extra data that may be useful. 1287 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 1288 for comments about the experimental format.) 1289 1290 The release version number is now more accurate in the usual case 1291 where releases are built from a Git repository. For example, if 1292 23 commits and some working-file changes have been made since 1293 release 2016g, the version number is now something like 1294 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 1295 Tagged releases use the same version number format as before, 1296 e.g., '2016g'. To support the more-accurate version number, its 1297 specification has moved from a line in the Makefile to a new 1298 source file 'version'. 1299 1300 The experimental distribution contains a file to2050.tzs that 1301 contains what should be the output of 'zdump -i -c 2050' on 1302 primary zones. If this file is available, 'make check' now checks 1303 that zdump generates this output. 1304 1305 'make check_web' now works on Fedora-like distributions. 1306 1307 Changes to documentation and commentary 1308 1309 tzfile.5 now documents the new restriction on POSIX TZ-like 1310 strings that is now implemented by zic. 1311 1312 Comments now cite URLs for some 1917-1921 Russian DST decrees. 1313 (Thanks to Alexander Belopolsky.) 1314 1315 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 1316 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 1317 description of Java 8 has been brought up to date (thanks to 1318 Stephen Colebourne). Its description of local time on Mars has 1319 been updated to match current practice, and URLs have been updated 1320 and some obsolete ones removed. 1321 1322 1323Release 2016f - 2016-07-05 16:26:51 +0200 1324 1325 Changes affecting future timestamps 1326 1327 The Egyptian government changed its mind on short notice, and 1328 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 1329 (Thanks to Mina Samuel.) 1330 1331 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 1332 (Thanks to Stepan Golosunov.) 1333 1334 Changes to past and future timestamps 1335 1336 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 1337 abbreviations instead of invented ones. 1338 1339 Changes affecting past timestamps 1340 1341 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 1342 (Thanks to Stepan Golosunov.) 1343 1344 1345Release 2016e - 2016-06-14 08:46:16 -0700 1346 1347 Changes affecting future timestamps 1348 1349 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 1350 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 1351 For future years, guess April's last Thursday to October's last 1352 Thursday except for Ramadan. 1353 1354 Changes affecting past timestamps 1355 1356 Locations while uninhabited now use '-00', not 'zzz', as a 1357 placeholder time zone abbreviation. This is inspired by Internet 1358 RFC 3339 and is more consistent with numeric time zone 1359 abbreviations already used elsewhere. The change affects several 1360 arctic and antarctic locations, e.g., America/Cambridge_Bay before 1361 1920 and Antarctica/Troll before 2005. 1362 1363 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 1364 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 1365 1366 Changes to code 1367 1368 zic now outputs a dummy transition at time 2**31 - 1 in zones 1369 whose POSIX-style TZ strings contain a '<'. This mostly works 1370 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 1371 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 1372 1373 Changes affecting documentation and commentary 1374 1375 tz-link.htm says why governments should give plenty of notice for 1376 time zone or DST changes, and refers to Matt Johnson's blog post. 1377 1378 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 1379 1380 1381Release 2016d - 2016-04-17 22:50:29 -0700 1382 1383 Changes affecting future timestamps 1384 1385 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 1386 (Thanks to Alexander Krivenyshev for the heads-up.) 1387 1388 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 1389 (Thanks to Alexander Krivenyshev and Matt Johnson.) 1390 1391 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 1392 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 1393 at 02:00. (Thanks to Stepan Golosunov.) 1394 1395 Changes affecting past timestamps 1396 1397 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 1398 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 1399 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 1400 the same change. (Thanks to Stepan Golosunov.) 1401 1402 Russia and nearby locations had daylight-saving transitions on 1403 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 1404 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 1405 Golosunov.) 1406 1407 Many corrections to historical time in Kazakhstan from 1991 1408 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 1409 invented time zone abbreviations with numeric abbreviations. 1410 1411 Changes to commentary 1412 1413 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 1414 1415 1416Release 2016c - 2016-03-23 00:51:27 -0700 1417 1418 Changes affecting future timestamps 1419 1420 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 1421 1422 Chile reverts from permanent to seasonal DST. (Thanks to Juan 1423 Correa for the heads-up, and to Tim Parenti for corrections.) 1424 Guess that future transitions are August's and May's second 1425 Saturdays at 24:00 mainland time. Also, call the period from 1426 2014-09-07 through 2016-05-14 daylight saving time instead of 1427 standard time, as that seems more appropriate now. 1428 1429 Changes affecting past timestamps 1430 1431 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 1432 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 1433 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 1434 (Thanks to Stepan Golosunov.) 1435 1436 Changes to commentary 1437 1438 Several updates and URLs for historical and proposed Russian changes. 1439 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 1440 1441 1442Release 2016b - 2016-03-12 17:30:14 -0800 1443 1444 Compatibility note 1445 1446 Starting with release 2016b, some data entries cause zic implementations 1447 derived from tz releases 2005j through 2015e to issue warnings like 1448 "time zone abbreviation differs from POSIX standard (+03)". 1449 These warnings should not otherwise affect zic's output and can safely be 1450 ignored on today's platforms, as the warnings refer to a restriction in 1451 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 1452 warnings is to upgrade to zic derived from tz releases 2015f and later. 1453 1454 Changes affecting future timestamps 1455 1456 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 1457 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 1458 2016-03-27 at 02:00 local time. They need distinct zones since their 1459 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 1460 Altai Republic, Russia, which will switch from +06 to +07 on the same date 1461 and local time. The Astrakhan change is already official; the others have 1462 passed the first reading in the State Duma and are extremely likely. 1463 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 1464 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 1465 and Stepan Golosunov for followup.) 1466 1467 As a trial of a new system that needs less information to be made up, 1468 the new zones use numeric time zone abbreviations like "+04" 1469 instead of invented abbreviations like "ASTT". 1470 1471 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 1472 Steffen Thorsen.) 1473 1474 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 1475 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 1476 Saturday at 01:00, not March's last Friday at 24:00. 1477 1478 Changes affecting past timestamps 1479 1480 Europe/Chisinau observed DST during 1990, and switched from +04 to 1481 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 1482 (Thanks to Stepan Golosunov.) 1483 1484 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 1485 KUYT/KUYST. (Thanks to Stepan Golosunov.) 1486 1487 Changes to code 1488 1489 tzselect's diagnostics and checking, and checktab.awk's checking, 1490 have been improved. (Thanks to J William Piggott.) 1491 1492 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 1493 1494 tzselect now tests Julian-date TZ settings more accurately. 1495 (Thanks to J William Piggott.) 1496 1497 Changes to commentary 1498 1499 Comments in zone tables have been improved. (Thanks to J William Piggott.) 1500 1501 tzselect again limits its menu comments so that menus fit on a 1502 24×80 alphanumeric display. 1503 1504 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 1505 1506 In the Theory file, the description of possible time zone abbreviations in 1507 tzdata has been cleaned up, as the old description was unclear and 1508 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 1509 1510 1511Release 2016a - 2016-01-26 23:28:02 -0800 1512 1513 Changes affecting future timestamps 1514 1515 America/Cayman will not observe daylight saving this year after all. 1516 Revert our guess that it would. (Thanks to Matt Johnson.) 1517 1518 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 1519 (Thanks to Alexander Krivenyshev.) 1520 1521 Asia/Tehran now has DST predictions for the year 2038 and later, 1522 to be March 21 00:00 to September 21 00:00. This is likely better 1523 than predicting no DST, albeit off by a day every now and then. 1524 1525 Changes affecting past and future timestamps 1526 1527 America/Metlakatla switched from PST all year to AKST/AKDT on 1528 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 1529 1530 America/Santa_Isabel has been removed, and replaced with a 1531 backward compatibility link to America/Tijuana. Its contents were 1532 apparently based on a misreading of Mexican legislation. 1533 1534 Changes affecting past timestamps 1535 1536 Asia/Karachi's two transition times in 2002 were off by a minute. 1537 (Thanks to Matt Johnson.) 1538 1539 Changes affecting build procedure 1540 1541 An installer can now combine leap seconds with use of the backzone file, 1542 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 1543 The old 'make posix_packrat' rule is now marked as obsolescent. 1544 (Thanks to Ian Abbott for an initial implementation.) 1545 1546 Changes affecting documentation and commentary 1547 1548 A new file LICENSE makes it easier to see that the code and data 1549 are mostly public-domain. (Thanks to James Knight.) The three 1550 non-public-domain files now use the current (3-clause) BSD license 1551 instead of older versions of that license. 1552 1553 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 1554 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 1555 on editing tz source files (with a mention of Sublime zoneinfo, 1556 thanks to Gilmore Davidson). 1557 1558 The Theory and asia files now mention the 2015 book "The Global 1559 Transformation of Time, 1870-1950", and cite a couple of reviews. 1560 1561 The America/Chicago entry now documents the informal use of US 1562 central time in Fort Pierre, South Dakota. (Thanks to Rick 1563 McDermid, Matt Johnson, and Steve Jones.) 1564 1565 1566Release 2015g - 2015-10-01 00:39:51 -0700 1567 1568 Changes affecting future timestamps 1569 1570 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 1571 (Thanks to Fatih.) 1572 1573 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 1574 (Thanks to Alexander Krivenyshev.) 1575 1576 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 1577 (Thanks to Ken Rylander.) 1578 1579 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 1580 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 1581 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 1582 1583 Changes affecting past timestamps 1584 1585 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 1586 1587 Changes affecting code 1588 1589 localtime no longer mishandles America/Anchorage after 2037. 1590 (Thanks to Bradley White for reporting the bug.) 1591 1592 On hosts with signed 32-bit time_t, localtime no longer mishandles 1593 Pacific/Fiji after 2038-01-16 14:00 UTC. 1594 1595 The localtime module allows the variables 'timezone', 'daylight', 1596 and 'altzone' to be in common storage shared with other modules, 1597 and declares them in case the system <time.h> does not. 1598 (Problems reported by Kees Dekker.) 1599 1600 On platforms with tm_zone, strftime.c now assumes it is not NULL. 1601 This simplifies the code and is consistent with zdump.c. 1602 (Problem reported by Christos Zoulas.) 1603 1604 Changes affecting documentation 1605 1606 The tzfile man page now documents that transition times denote the 1607 starts (not the ends) of the corresponding time periods. 1608 (Ambiguity reported by Bill Seymour.) 1609 1610 1611Release 2015f - 2015-08-10 18:06:56 -0700 1612 1613 Changes affecting future timestamps 1614 1615 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 1616 The abbreviation remains "KST". (Thanks to Robert Elz.) 1617 1618 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 1619 and Pablo Camargo.) 1620 1621 Changes affecting past and future timestamps 1622 1623 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 1624 (Thanks to Roman Tudos.) 1625 1626 Changes affecting data format and code 1627 1628 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 1629 field of a Rule line should now be '-'; the old values 'even', 1630 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 1631 Although the implementation has not changed, these features do not 1632 work in the default installation, they are not used in the data, 1633 and they are now considered obsolescent. 1634 1635 zic now checks that two rules don't take effect at the same time. 1636 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 1637 simultaneity are now documented. 1638 1639 The two characters '%z' in a zone format now stand for the UT 1640 offset, e.g., '-07' for seven hours behind UT and '+0530' for 1641 five hours and thirty minutes ahead. This better supports time 1642 zone abbreviations conforming to POSIX.1-2001 and later. 1643 1644 Changes affecting installed data files 1645 1646 Comments for America/Halifax and America/Glace_Bay have been improved. 1647 (Thanks to Brian Inglis.) 1648 1649 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 1650 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 1651 installed data files for Europe/Simferopol and Europe/Tallinn. 1652 It does not affect timestamps. (Thanks to Howard Hinnant.) 1653 1654 Changes affecting code 1655 1656 zdump and zic no longer warn about valid time zone abbreviations 1657 like '-05'. 1658 1659 Some Visual Studio 2013 warnings have been suppressed. 1660 (Thanks to Kees Dekker.) 1661 1662 'date' no longer sets the time of day and its -a, -d, -n and -t 1663 options have been removed. Long obsolescent, the implementation 1664 of these features had porting problems. Builders no longer need 1665 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 1666 (Thanks to Kees Dekker for pointing out the problem.) 1667 1668 Changes affecting documentation 1669 1670 The Theory file mentions naming issues earlier, as these seem to be 1671 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 1672 1673 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 1674 1675 Mention that Herbert Samuel introduced the term "Summer Time". 1676 1677 1678Release 2015e - 2015-06-13 10:56:02 -0700 1679 1680 Changes affecting future timestamps 1681 1682 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 1683 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 1684 1685 Assume Cayman Islands will observe DST starting next year, using US rules. 1686 Although it isn't guaranteed, it is the most likely. 1687 1688 Changes affecting data format 1689 1690 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 1691 spell the names of Åland Islands, Côte d'Ivoire, and Réunion. 1692 1693 Changes affecting code 1694 1695 When displaying data, tzselect converts it to the current locale's 1696 encoding if the iconv command works. (Problem reported by random832.) 1697 1698 tzselect no longer mishandles Dominica, fixing a bug introduced 1699 in Release 2014f. (Problem reported by Owen Leibman.) 1700 1701 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 1702 This fixes a bug introduced in Release 2014f. 1703 (Problem reported by Leonardo Chiquitto.) 1704 1705 1706Release 2015d - 2015-04-24 08:09:46 -0700 1707 1708 Changes affecting future timestamps 1709 1710 Egypt will not observe DST in 2015 and will consider canceling it 1711 permanently. For now, assume no DST indefinitely. 1712 (Thanks to Ahmed Nazmy and Tim Parenti.) 1713 1714 Changes affecting past timestamps 1715 1716 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 1717 1966-07-01. Also, Yukon's time zone history is documented better. 1718 (Thanks to Brian Inglis and Dennis Ferguson.) 1719 1720 Change affecting past and future time zone abbreviations 1721 1722 The abbreviations for Hawaii-Aleutian standard and daylight times 1723 have been changed from HAST/HADT to HST/HDT, as per US Government 1724 Printing Office style. This affects only America/Adak since 1983, 1725 as America/Honolulu was already using the new style. 1726 1727 Changes affecting code 1728 1729 zic has some minor performance improvements. 1730 1731 1732Release 2015c - 2015-04-11 08:55:55 -0700 1733 1734 Changes affecting future timestamps 1735 1736 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 1737 not 00:00 on April's last Friday. 2015's transition will therefore be on 1738 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 1739 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 1740 1741 Changes affecting past timestamps 1742 1743 The following changes affect some pre-1991 Chile-related timestamps 1744 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 1745 1746 The 1910 transition was January 10, not January 1. 1747 1748 The 1918 transition was September 10, not September 1. 1749 1750 The UT -04 time observed from 1932 to 1942 is now considered to 1751 be standard time, not year-round DST. 1752 1753 Santiago observed DST (UT -03) from 1946-07-15 through 1754 1946-08-31, then reverted to standard time, then switched to -05 1755 on 1947-04-01. 1756 1757 Assume transitions before 1968 were at 00:00, since we have no data 1758 saying otherwise. 1759 1760 The spring 1988 transition was 1988-10-09, not 1988-10-02. 1761 The fall 1990 transition was 1990-03-11, not 1990-03-18. 1762 1763 Assume no UT offset change for Pacific/Easter on 1890-01-01, 1764 and omit all transitions on Pacific/Easter from 1942 through 1946 1765 since we have no data suggesting that they existed. 1766 1767 One more zone has been turned into a link, as it differed 1768 from an existing zone only for older timestamps. As usual, 1769 this change affects UT offsets in pre-1970 timestamps only. 1770 The zone's old contents have been moved to the 'backzone' file. 1771 The affected zone is America/Montreal. 1772 1773 Changes affecting commentary 1774 1775 Mention the TZUpdater tool. 1776 1777 Mention "The Time Now". (Thanks to Brandon Ramsey.) 1778 1779 1780Release 2015b - 2015-03-19 23:28:11 -0700 1781 1782 Changes affecting future timestamps 1783 1784 Mongolia will start observing DST again this year, from the last 1785 Saturday in March at 02:00 to the last Saturday in September at 00:00. 1786 (Thanks to Ganbold Tsagaankhuu.) 1787 1788 Palestine will start DST on March 28, not March 27. Also, 1789 correct the fall 2014 transition from September 26 to October 24. 1790 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 1791 1792 Changes affecting past timestamps 1793 1794 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 1795 regression. (Thanks to Stuart Bishop for reporting the problem.) 1796 1797 Some more zones have been turned into links, when they differed 1798 from existing zones only for older timestamps. As usual, 1799 these changes affect UT offsets in pre-1970 timestamps only. 1800 Their old contents have been moved to the 'backzone' file. 1801 The affected zones are: America/Antigua, America/Cayman, 1802 Pacific/Midway, and Pacific/Saipan. 1803 1804 Changes affecting time zone abbreviations 1805 1806 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 1807 (Thanks to Hank W.) 1808 1809 Changes affecting code 1810 1811 Fix integer overflow bug in reference 'mktime' implementation. 1812 (Problem reported by Jörg Richter.) 1813 1814 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 1815 to be used in the same executable as standard-library time_t functions. 1816 (Problems reported by Bradley White.) 1817 1818 Changes affecting commentary 1819 1820 Cite the recent Mexican decree changing Quintana Roo's time zone. 1821 (Thanks to Carlos Raúl Perasso.) 1822 1823 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 1824 1825 Update info about Mars time. 1826 1827 1828Release 2015a - 2015-01-29 22:35:20 -0800 1829 1830 Changes affecting future timestamps 1831 1832 The Mexican state of Quintana Roo, represented by America/Cancun, 1833 will shift from Central Time with DST to Eastern Time without DST 1834 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 1835 1836 Chile will not change clocks in April or thereafter; its new standard time 1837 will be its old daylight saving time. This affects America/Santiago, 1838 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 1839 1840 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 1841 (Thanks to Tim Parenti.) 1842 1843 Changes affecting past timestamps 1844 1845 Iceland observed DST in 1919 and 1921, and its 1939 fallback 1846 transition was Oct. 29, not Nov. 29. Remove incorrect data from 1847 Shanks about time in Iceland between 1837 and 1908. 1848 1849 Some more zones have been turned into links, when they differed 1850 from existing zones only for older timestamps. As usual, 1851 these changes affect UT offsets in pre-1970 timestamps only. 1852 Their old contents have been moved to the 'backzone' file. 1853 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 1854 and Asia/Muscat. 1855 1856 Changes affecting code 1857 1858 tzalloc now scrubs time zone abbreviations compatibly with the way 1859 that tzset always has, by replacing invalid bytes with '_' and by 1860 shortening too-long abbreviations. 1861 1862 tzselect ports to POSIX awk implementations, no longer mishandles 1863 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 1864 settings to the user. (Thanks to Stefan Kuhn.) 1865 1866 Changes affecting build procedure 1867 1868 'make check' now checks for links to links in the data. 1869 One such link (for Africa/Asmera) has been fixed. 1870 (Thanks to Stephen Colebourne for pointing out the problem.) 1871 1872 Changes affecting commentary 1873 1874 The leapseconds file commentary now mentions the expiration date. 1875 (Problem reported by Martin Burnicki.) 1876 1877 Update Mexican Library of Congress URL. 1878 1879 1880Release 2014j - 2014-11-10 17:37:11 -0800 1881 1882 Changes affecting current and future timestamps 1883 1884 Turks & Caicos' switch from US eastern time to UT -04 year-round 1885 did not occur on 2014-11-02 at 02:00. It's currently scheduled 1886 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 1887 1888 Changes affecting past timestamps 1889 1890 Many pre-1989 timestamps have been corrected for Asia/Seoul and 1891 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 1892 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 1893 longer guess that Pyongyang mimicked Seoul time after World War II, 1894 as this is politically implausible. 1895 1896 Some more zones have been turned into links, when they differed 1897 from existing zones only for older timestamps. As usual, 1898 these changes affect UT offsets in pre-1970 timestamps only. 1899 Their old contents have been moved to the 'backzone' file. 1900 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 1901 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 1902 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 1903 Indian/Mayotte. 1904 1905 Changes affecting commentary 1906 1907 The commentary is less enthusiastic about Shanks as a source, 1908 and is more careful to distinguish UT from UTC. 1909 1910 1911Release 2014i - 2014-10-21 22:04:57 -0700 1912 1913 Changes affecting future timestamps 1914 1915 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 1916 (Thanks to Ken Rylander for the heads-up.) Guess that future 1917 years will use a similar pattern. 1918 1919 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 1920 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 1921 (Thanks to Kiley Walbom for the heads-up.) 1922 1923 Changes affecting time zone abbreviations 1924 1925 Since Belarus is not changing its clocks even though Moscow is, 1926 the time zone abbreviation in Europe/Minsk is changing from FET 1927 to its more-traditional value MSK on 2014-10-26 at 01:00. 1928 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 1929 1930 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 1931 Indochina, to distinguish it better from ICT (+07). 1932 1933 Changes affecting past timestamps 1934 1935 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 1936 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's 1937 authoritative book). Asia/Ho_Chi_Minh has been added to 1938 zone1970.tab, to give tzselect users in Vietnam two choices, 1939 since north and south Vietnam disagreed after our 1970 cutoff. 1940 1941 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 1942 they differed from existing zones only for older timestamps. As 1943 usual, these changes affect pre-1970 timestamps only. Their old 1944 contents have been moved to the 'backzone' file. 1945 1946 Changes affecting code 1947 1948 The time-related library functions now set errno on failure, and 1949 some crashes in the new tzalloc-related library functions have 1950 been fixed. (Thanks to Christos Zoulas for reporting most of 1951 these problems and for suggesting fixes.) 1952 1953 If USG_COMPAT is defined and the requested timestamp is standard time, 1954 the tz library's localtime and mktime functions now set the extern 1955 variable timezone to a value appropriate for that timestamp; and 1956 similarly for ALTZONE, daylight saving time, and the altzone variable. 1957 This change is a companion to the tzname change in 2014h, and is 1958 designed to make timezone and altzone more compatible with tzname. 1959 1960 The tz library's functions now set errno to EOVERFLOW if they fail 1961 because the result cannot be represented. ctime and ctime_r now 1962 return NULL and set errno when a timestamp is out of range, rather 1963 than having undefined behavior. 1964 1965 Some bugs associated with the new 2014g functions have been fixed. 1966 This includes a bug that largely incapacitated the new functions 1967 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 1968 It also includes some uses of uninitialized variables after tzalloc. 1969 The new code uses the standard type 'ssize_t', which the Makefile 1970 now gives porting advice about. 1971 1972 Changes affecting commentary 1973 1974 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 1975 1976 1977Release 2014h - 2014-09-25 18:59:03 -0700 1978 1979 Changes affecting past timestamps 1980 1981 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 1982 1983 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 1984 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 1985 1986 Some more zones have been turned into links, when they differed 1987 from existing zones only for older timestamps. As usual, 1988 these changes affect UT offsets in pre-1970 timestamps only. 1989 Their old contents have been moved to the 'backzone' file. 1990 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 1991 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 1992 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 1993 1994 Changes affecting code 1995 1996 zdump -V and -v now output gmtoff= values on all platforms, 1997 not merely on platforms defining TM_GMTOFF. 1998 1999 The tz library's localtime and mktime functions now set tzname to a value 2000 appropriate for the requested timestamp, and zdump now uses this 2001 on platforms not defining TM_ZONE, fixing a 2014g regression. 2002 (Thanks to Tim Parenti for reporting the problem.) 2003 2004 The tz library no longer sets tzname if localtime or mktime fails. 2005 2006 zdump -c no longer mishandles transitions near year boundaries. 2007 (Thanks to Tim Parenti for reporting the problem.) 2008 2009 An access to uninitialized data has been fixed. 2010 (Thanks to Jörg Richter for reporting the problem.) 2011 2012 When THREAD_SAFE is defined, the code ports to the C11 memory model. 2013 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 2014 and two threads race to initialize data used by gmtime-like functions. 2015 (Thanks to Andy Heninger for reporting the problems.) 2016 2017 Changes affecting build procedure 2018 2019 'make check' now checks better for properly-sorted data. 2020 2021 Changes affecting documentation and commentary 2022 2023 zdump's gmtoff=N output is now documented, and its isdst=D output 2024 is now documented to possibly output D values other than 0 or 1. 2025 2026 zdump -c's treatment of years is now documented to use the 2027 Gregorian calendar and Universal Time without leap seconds, 2028 and its behavior at cutoff boundaries is now documented better. 2029 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 2030 2031 Programs are now documented to use the proleptic Gregorian calendar. 2032 (Thanks to Alan Barrett for the suggestion.) 2033 2034 Fractional-second GMT offsets have been documented for civil time 2035 in 19th-century Chennai, Jakarta, and New York. 2036 2037 2038Release 2014g - 2014-08-28 12:31:23 -0700 2039 2040 Changes affecting future timestamps 2041 2042 Turks & Caicos is switching from US eastern time to UT -04 2043 year-round, modeled as a switch on 2014-11-02 at 02:00. 2044 [As noted in 2014j, this switch was later delayed.] 2045 2046 Changes affecting past timestamps 2047 2048 Time in Russia or the USSR before 1926 or so has been corrected by 2049 a few seconds in the following zones: Asia/Irkutsk, 2050 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 2051 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 2052 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 2053 Vladimir Karpinsky.) 2054 2055 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 2056 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 2057 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 2058 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 2059 (Thanks to Stephen Colebourne for pointing to the decree.) 2060 2061 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 2062 2063 A new file 'backzone' contains data which may appeal to 2064 connoisseurs of old timestamps, although it is out of scope for 2065 the tz database, is often poorly sourced, and contains some data 2066 that is known to be incorrect. The new file is not recommended 2067 for ordinary use and its entries are not installed by default. 2068 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 2069 Isle of Man entries.) 2070 2071 Some more zones have been turned into links, when they differed 2072 from existing zones only for older timestamps. As usual, 2073 these changes affect UT offsets in pre-1970 timestamps only. 2074 Their old contents have been moved to the 'backzone' file. 2075 The affected zones are: Africa/Bangui, Africa/Brazzaville, 2076 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 2077 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 2078 2079 Changes affecting code 2080 2081 Unless NETBSD_INSPIRED is defined to 0, the tz library now 2082 supplies functions for creating and using objects that represent 2083 timezones. The new functions are tzalloc, tzfree, localtime_rz, 2084 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 2085 time2posix_z. They are intended for performance: for example, 2086 localtime_rz (unlike localtime_r) is trivially thread-safe without 2087 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 2088 functions, and to Alan Barrett and Jonathan Lennox for helping to 2089 debug the change.) 2090 2091 zdump now builds with the tz library unless USE_LTZ is defined to 0, 2092 This lets zdump use tz features even if the system library lacks them. 2093 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 2094 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 2095 2096 zdump now uses localtime_rz if available, as it's significantly faster, 2097 and it can help zdump better diagnose invalid timezone names. 2098 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 2099 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 2100 not available, zdump now uses localtime_r and tzset if available, 2101 as this is a bit cleaner and faster than plain localtime. Compile 2102 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 2103 lacks these two functions. 2104 2105 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 2106 Although not needed for tz's own applications, which are single-threaded, 2107 this supports POSIX better if the tz library is used in multithreaded apps. 2108 2109 Some crashes have been fixed when zdump or the tz library is given 2110 invalid or outlandish input. 2111 2112 The tz library no longer mishandles leap seconds on platforms with 2113 unsigned time_t in timezones that lack ordinary transitions after 1970. 2114 2115 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 2116 already defined, to make it easier to configure on common platforms. 2117 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 2118 2119 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 2120 assumes that reading uninitialized memory yields garbage values 2121 but does not cause other problems such as traps. 2122 2123 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 2124 more likely to guess right for ambiguous timestamps near 2125 transitions where tm_isdst does not change. 2126 2127 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 2128 strftime_l for compatibility with recent versions of POSIX. 2129 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 2130 to 1 on recent POSIX versions, and to 0 otherwise. 2131 2132 tzselect -c now uses a hybrid distance measure that works better 2133 in Africa. (Thanks to Alan Barrett for noting the problem.) 2134 2135 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 2136 or when time_tz is defined. 2137 2138 When HAVE_UTMPX_H is set the 'date' command now builds on systems 2139 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 2140 the date it updates the wtmpx file if _PATH_WTMPX is defined. 2141 This affects GNU/Linux and similar systems. 2142 2143 For easier maintenance later, some C code has been simplified, 2144 some lint has been removed, and the code has been tweaked so that 2145 plain 'make' is more likely to work. 2146 2147 The C type 'bool' is now used for boolean values, instead of 'int'. 2148 2149 The long-obsolete LOCALE_HOME code has been removed. 2150 2151 The long-obsolete 'gtime' function has been removed. 2152 2153 Changes affecting build procedure 2154 2155 'zdump' no longer links in ialloc.o, as it's not needed. 2156 2157 'make check_time_t_alternatives' no longer assumes GNU diff. 2158 2159 Changes affecting distribution tarballs 2160 2161 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 2162 the tzdata tarball instead of the tzcode tarball, since they help 2163 maintain the data. The NEWS and Theory files are now also 2164 distributed in the tzdata tarball, as they're relevant for data. 2165 (Thanks to Alan Barrett for pointing this out.) Also, the 2166 leapseconds.awk file is no longer distributed in the tzcode 2167 tarball, since it belongs in the tzdata tarball (where 2014f 2168 inadvertently also distributed it). 2169 2170 Changes affecting documentation and commentary 2171 2172 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 2173 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 2174 for debugging it.) 2175 2176 The man pages have been updated to use function prototypes, 2177 to document thread-safe variants like localtime_r, and to document 2178 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 2179 mktime_z. 2180 2181 The fields in Link lines have been renamed to be more descriptive 2182 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 2183 and LINK-TO has become LINK-NAME. 2184 2185 tz-link.htm mentions the IETF's tzdist working group; Windows 2186 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 2187 2188 Some broken URLs have been fixed in the commentary. (Thanks to 2189 Lester Caine.) 2190 2191 Commentary about Philippines DST has been updated, and commentary 2192 on pre-1970 time in India has been added. 2193 2194 2195Release 2014f - 2014-08-05 17:42:36 -0700 2196 2197 Changes affecting future timestamps 2198 2199 Russia will subtract an hour from most of its time zones on 2014-10-26 2200 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 2201 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 2202 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 2203 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 2204 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 2205 (Europe/Samara) are not changing their clocks. The changed zones are 2206 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 2207 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 2208 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 2209 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 2210 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 2211 but not its UTC offset. Two zones are added: Asia/Chita (split 2212 from Asia/Yakutsk, and also with two hours subtracted) and 2213 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 2214 subtracted). (Thanks to Tim Parenti for much of the above.) 2215 2216 Changes affecting time zone abbreviations 2217 2218 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 2219 and similarly for the other Australian zones. That is, for eastern 2220 standard and daylight saving time the abbreviations are AEST and AEDT 2221 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 2222 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 2223 This change does not affect UT offsets, only time zone abbreviations. 2224 (Thanks to Rich Tibbett and many others.) 2225 2226 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 2227 effective 2014-10-26 at 02:00 local time. 2228 2229 The time zone abbreviation for Xinjiang Time (observed in Ürümqi) 2230 has been changed from URUT to XJT. (Thanks to Luther Ma.) 2231 2232 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 2233 Similarly, prefer EET/EEST for eastern European time in Russia. 2234 2235 Change time zone abbreviations in (western) Samoa to use "ST" and 2236 "DT" suffixes, as this is more likely to match common practice. 2237 Prefix "W" to (western) Samoa time when its standard-time offset 2238 disagrees with that of American Samoa. 2239 2240 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 2241 2242 Time zone abbreviations have been updated for Japan's two time 2243 zones used 1896-1937. JWST now stands for Western Standard 2244 Time, and JCST for Central Standard Time (formerly this was CJT). 2245 These abbreviations are now used for time in Korea, Taiwan, 2246 and Sakhalin while controlled by Japan. 2247 2248 Changes affecting past timestamps 2249 2250 China's five zones have been simplified to two, since the post-1970 2251 differences in the other three seem to have been imaginary. The 2252 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 2253 removed; backwards-compatibility links still work, albeit with 2254 different behaviors for timestamps before May 1980. Asia/Urumqi's 2255 1980 transition to UT +08 has been removed, so that it is now at 2256 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 2257 Treindl sent helpful translations of two papers by Guo Qingsheng.) 2258 2259 Some zones have been turned into links, when they differed from existing 2260 zones only for older UT offsets where data entries were likely invented. 2261 These changes affect UT offsets in pre-1970 timestamps only. This is 2262 similar to the change in release 2013e, except this time for western 2263 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 2264 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 2265 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 2266 Atlantic/St_Helena. This also affects the backwards-compatibility 2267 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 2268 Tim Parenti, and David Patte for reporting problems in earlier 2269 versions of this change.) 2270 2271 Asia/Shanghai's pre-standard-time UT offset has been changed from 2272 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 2273 transition to standard time has been changed from 1928 to 1901. 2274 2275 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 2276 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 2277 In 1946 it observed DST from 05-15 through 09-30; in 1947 2278 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 2279 (Thanks to Yu-Cheng Chuang.) 2280 2281 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 2282 2283 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 2284 10-03 at 00:00. (Thanks to Konstantin Hyppönen.) 2285 2286 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 2287 period from 1911 to 1950. 2288 2289 Pacific/Chatham has been changed to New Zealand standard time plus 2290 45 minutes for the period before 1957, reflecting a 1956 remark in 2291 the New Zealand parliament. 2292 2293 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 2294 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 2295 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 2296 not 04-06 at 02:00; and there was no DST in 1920. 2297 2298 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 2299 2300 Time in Russia before 1927 or so has been corrected by a few seconds in 2301 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 2302 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 2303 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 2304 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 2305 2306 Changes affecting data format 2307 2308 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 2309 The new file's extended format allows multiple country codes per zone. 2310 The older file is still installed but is deprecated; its format is 2311 not changing and it will still be distributed for a while, but new 2312 applications should use the new file. 2313 2314 The new file format simplifies maintenance of obscure locations. 2315 To test this, it adds coverage for the Crozet Islands and the 2316 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 2317 2318 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 2319 It is still ASCII now, but commentary about the switch has been added. 2320 The new file 'zone1970.tab' already uses UTF-8. 2321 2322 Changes affecting code 2323 2324 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 2325 is defined. (Thanks to Elliott Hughes for reporting the problem.) 2326 2327 'zic' no longer mishandles input when ignoring case in locales that 2328 are not compatible with English, e.g., unibyte Turkish locales when 2329 compiled with HAVE_GETTEXT. 2330 2331 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 2332 they no longer use ASCII '-' as if it were a dash. 2333 2334 'zic' now rejects output file names that contain '.' or '..' components. 2335 (Thanks to Tim Parenti for reporting the problem.) 2336 2337 'zic -v' now warns about output file names that do not follow 2338 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 2339 David Olson for starting the ball rolling on this.) 2340 2341 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 2342 2343 Changes affecting build procedure 2344 2345 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 2346 (Thanks to John Cochran.) 2347 2348 Changes affecting documentation and commentary 2349 2350 The 'Theory' file documents legacy names, the longstanding 2351 exceptions to the POSIX-inspired file name rules. 2352 2353 The 'zic' documentation clarifies the role of time types when 2354 interpreting dates. (Thanks to Arthur David Olson.) 2355 2356 Documentation and commentary now prefer UTF-8 to US-ASCII, 2357 allowing the use of proper accents in foreign words and names. 2358 Code and data have not changed because of this. (Thanks to 2359 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 2360 this.) 2361 2362 Non-HTML documentation and commentary now use plain-text URLs instead of 2363 HTML insertions, and are more consistent about bracketing URLs when they 2364 are not already surrounded by white space. (Thanks to suggestions by 2365 Steffen Nurpmeso.) 2366 2367 There is new commentary about Xujiahui Observatory, the five time-zone 2368 project in China from 1918 to 1949, timekeeping in Japanese-occupied 2369 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 2370 warlord Jin Shuren in the data. 2371 2372 Commentary about the coverage of each Russian zone has been standardized. 2373 (Thanks to Tim Parenti.) 2374 2375 There is new commentary about contemporary timekeeping in Ethiopia. 2376 2377 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 2378 2379 There is new commentary about time in Poland in 1919. 2380 2381 Proper credit has been given to DST inventor George Vernon Hudson. 2382 2383 Commentary about time in Metlakatla, AK and Resolute, NU has been 2384 improved, with a new source for the former. 2385 2386 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it 2387 is uninhabited. 2388 2389 Commentary about permanent Antarctic bases has been updated. 2390 2391 Several typos have been corrected. (Thanks to Tim Parenti for 2392 contributing some of these fixes.) 2393 2394 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 2395 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 2396 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 2397 (Thanks to a heads-up from Dirkjan Ochtman.) 2398 2399 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 2400 have been removed. These obsolescent US Naval Observatory entries were no 2401 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 2402 2403 2404Release 2014e - 2014-06-12 21:53:52 -0700 2405 2406 Changes affecting near-future timestamps 2407 2408 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 2409 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 2410 switch to standard time at 24:00 the last Thursday before Ramadan, and 2411 back to DST at 00:00 the first Friday after Ramadan. 2412 2413 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 2414 to Milamber Space Network.) Guess that from 2015 on Morocco will 2415 temporarily switch to standard time at 03:00 the last Saturday before 2416 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 2417 2418 Changes affecting past timestamps 2419 2420 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 2421 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 2422 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 2423 in 1991. (Thanks to Hank W. for reporting the problems.) 2424 2425 Changes affecting commentary 2426 2427 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 2428 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 2429 removes stale pointers to World Time Explorer and WORLDTIME. 2430 2431 2432Release 2014d - 2014-05-27 21:34:40 -0700 2433 2434 Changes affecting code 2435 2436 zic no longer generates files containing timestamps before the Big Bang. 2437 This works around GNOME glib bug 878 2438 <https://gitlab.gnome.org/GNOME/glib/issues/878> 2439 (Thanks to Leonardo Chiquitto for reporting the bug, and to 2440 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 2441 2442 Changes affecting documentation 2443 2444 tz-link.htm now mentions GNOME. 2445 2446 2447Release 2014c - 2014-05-13 07:44:13 -0700 2448 2449 Changes affecting near-future timestamps 2450 2451 Egypt observes DST starting 2014-05-15 at 24:00. 2452 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 2453 Details have not been announced, except that DST will not be observed 2454 during Ramadan. Guess that DST will stop during the same Ramadan dates as 2455 Morocco, and that Egypt's future spring and fall transitions will be the 2456 same as 2010 when it last observed DST, namely April's last Friday at 2457 00:00 to September's last Thursday at 23:00 standard time. Also, guess 2458 that Ramadan transitions will be at 00:00 standard time. 2459 2460 Changes affecting code 2461 2462 zic now generates transitions for minimum time values, eliminating guesswork 2463 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 2464 2465 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 2466 2467 Changes affecting commentary and documentation 2468 2469 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 2470 2471 2472Release 2014b - 2014-03-24 21:28:50 -0700 2473 2474 Changes affecting near-future timestamps 2475 2476 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 2477 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 2478 2479 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 2480 Bengt-Inge Larsson.) This is currently an approximation; a better version 2481 will require the zic and localtime fixes mentioned below, and the plan is 2482 to wait for a while until at least the zic fixes propagate. 2483 2484 Changes affecting code 2485 2486 'zic' and 'localtime' no longer reject locations needing four transitions 2487 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 2488 Also, 'zic' avoids some unlikely failures due to integer overflow. 2489 2490 Changes affecting build procedure 2491 2492 'make check' now detects Rule lines defined but never used. 2493 The NZAQ rules, an instance of this problem, have been removed. 2494 2495 Changes affecting commentary and documentation 2496 2497 Fix Tuesday/Thursday typo in description of time in Israel. 2498 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 2499 2500 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 2501 to Donald MacQueen.) Instead, the Microsoft Windows Store app 2502 library supports them. 2503 2504 Add comments about Johnston Island time in the 1960s. 2505 (Thanks to Lyle McElhaney.) 2506 2507 Morocco's 2014 DST start will be as predicted. 2508 (Thanks to Sebastien Willemijns.) 2509 2510 2511Release 2014a - 2014-03-07 23:30:29 -0800 2512 2513 Changes affecting near-future timestamps 2514 2515 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 2516 the heads-up, and to Tim Parenti for simplifying the update.) 2517 2518 Changes affecting past timestamps 2519 2520 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00. 2521 (Thanks to Steffen Thorsen.) 2522 2523 Ukraine switched from Moscow to Eastern European time on 1990-07-01 2524 (not 1992-01-01), and observed DST during the entire next winter. 2525 (Thanks to Vladimir in Moscow via Alois Treindl.) 2526 2527 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 2528 (Thanks to Avigdor Finkelstein.) 2529 2530 Changes affecting code 2531 2532 A uninitialized-storage bug in 'localtime' has been fixed. 2533 (Thanks to Logan Chien.) 2534 2535 Changes affecting the build procedure 2536 2537 The settings for 'make check_web' now default to Ubuntu 13.10. 2538 2539 Changes affecting commentary and documentation 2540 2541 The boundary of the US Pacific time zone is given more accurately. 2542 (Thanks to Alan Mintz.) 2543 2544 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.) 2545 2546 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.) 2547 2548 Better descriptions of countries with same time zone history as 2549 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 2550 2551 Several changes affect tz-link.htm, the main web page. 2552 2553 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 2554 David Braverman). 2555 2556 Mention xCal (Internet RFC 6321) and jCal. 2557 2558 Microsoft has some support for tz database names. 2559 2560 CLDR data formats include both XML and JSON. 2561 2562 Mention Maggiolo's map of solar vs standard time. 2563 (Thanks to Arthur David Olson.) 2564 2565 Mention TZ4Net. (Thanks to Matt Johnson.) 2566 2567 Mention the timezone-olson Haskell package. 2568 2569 Mention zeitverschiebung.net. (Thanks to Martin Jäger.) 2570 2571 Remove moribund links to daylight-savings-time.info and to 2572 Simple Timer + Clocks. 2573 2574 Update two links. (Thanks to Oscar van Vlijmen.) 2575 2576 Fix some formatting glitches, e.g., remove random newlines from 2577 abbr elements' title attributes. 2578 2579 2580Release 2013i - 2013-12-17 07:25:23 -0800 2581 2582 Changes affecting near-future timestamps: 2583 2584 Jordan switches back to standard time at 00:00 on December 20, 2013. 2585 The 2006-2011 transition schedule is planned to resume in 2014. 2586 (Thanks to Steffen Thorsen.) 2587 2588 Changes affecting past timestamps: 2589 2590 In 2004, Cuba began DST on March 28, not April 4. 2591 (Thanks to Steffen Thorsen.) 2592 2593 Changes affecting code 2594 2595 The compile-time flag NOSOLAR has been removed, as nowadays the 2596 benefit of slightly shrinking runtime table size is outweighed by the 2597 cost of disallowing potential future updates that exceed old limits. 2598 2599 Changes affecting documentation and commentary 2600 2601 The files solar87, solar88, and solar89 are no longer distributed. 2602 They were a negative experiment - that is, a demonstration that 2603 tz data can represent solar time only with some difficulty and error. 2604 Their presence in the distribution caused confusion, as Riyadh 2605 civil time was generally not solar time in those years. 2606 2607 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 2608 2609 2610Release 2013h - 2013-10-25 15:32:32 -0700 2611 2612 Changes affecting current and future timestamps: 2613 2614 Libya has switched its UT offset back to +02 without DST, instead 2615 of +01 with DST. (Thanks to Even Scharning.) 2616 2617 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 2618 (Thanks to Gwillim Law.) 2619 2620 Changes affecting future timestamps: 2621 2622 Acre and (we guess) western Amazonas will switch from UT -04 to -05 2623 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 2624 (Thanks to Steffen Thorsen.) 2625 2626 Add entries for DST transitions in Morocco in the year 2038. 2627 This avoids some year-2038 glitches introduced in 2013g. 2628 (Thanks to Yoshito Umaoka for reporting the problem.) 2629 2630 Changes affecting API 2631 2632 The 'tzselect' command no longer requires the 'select' command, 2633 and should now work with /bin/sh on more platforms. It also works 2634 around a bug in BusyBox awk before version 1.21.0. (Thanks to 2635 Patrick 'P. J.' McDermott and Alan Barrett.) 2636 2637 Changes affecting code 2638 2639 Fix localtime overflow bugs with 32-bit unsigned time_t. 2640 2641 zdump no longer assumes sscanf returns maximal values on overflow. 2642 2643 Changes affecting the build procedure 2644 2645 The builder can specify which programs to use, if any, instead of 2646 'ar' and 'ranlib', and libtz.a is now built locally before being 2647 installed. (Thanks to Michael Forney.) 2648 2649 A dependency typo in the 'zdump' rule has been fixed. 2650 (Thanks to Andrew Paprocki.) 2651 2652 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 2653 work as specified by POSIX.2-1992 or later; this is portable nowadays. 2654 2655 'make clean' no longer removes 'leapseconds', since it's 2656 host-independent and is part of the distribution. 2657 2658 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 2659 2660 Changes affecting documentation and commentary 2661 2662 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 2663 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 2664 2665 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 2666 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 2667 longer maintained) and for old advisories. SOFA now does C. 2668 2669Release 2013g - 2013-09-30 21:08:26 -0700 2670 2671 Changes affecting current and near-future timestamps 2672 2673 Morocco now observes DST from the last Sunday in March to the last 2674 Sunday in October, not April to September respectively. (Thanks 2675 to Steffen Thorsen.) 2676 2677 Changes affecting 'zic' 2678 2679 'zic' now runs on platforms that lack both hard links and symlinks. 2680 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 2681 Also, fix some bugs on platforms that lack hard links but have symlinks. 2682 2683 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 2684 to predict the far future, fixing a bug introduced in 2013e. 2685 2686 Changes affecting the build procedure 2687 2688 The 'leapseconds' file is again put into the tzdata tarball. 2689 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 2690 Matt Burgess and Ian Abbott.) The timestamps of these and other 2691 dependent files in tarballs are adjusted more consistently. 2692 2693 Changes affecting documentation and commentary 2694 2695 The README file is now part of the data tarball as well as the code. 2696 It now states that files are public domain unless otherwise specified. 2697 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 2698 Its details about the 1989 release moved to a place of honor near 2699 the end of NEWS. 2700 2701 2702Release 2013f - 2013-09-24 23:37:36 -0700 2703 2704 Changes affecting near-future timestamps 2705 2706 Tocantins will very likely not observe DST starting this spring. 2707 (Thanks to Steffen Thorsen.) 2708 2709 Jordan will likely stay at UT +03 indefinitely, and will not fall 2710 back this fall. 2711 2712 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 2713 2714 Changes affecting API 2715 2716 The types of the global variables 'timezone' and 'altzone' (if present) 2717 have been changed back to 'long'. This is required for 'timezone' 2718 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 2719 These variables were originally 'long' in the tz code, but were 2720 mistakenly changed to 'time_t' in 1987; nobody reported the 2721 incompatibility until now. The difference matters on x32, where 2722 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 2723 2724 Changes affecting the build procedure 2725 2726 Avoid long strings in leapseconds.awk to work around a mawk bug. 2727 (Thanks to Cyril Baurand.) 2728 2729 Changes affecting documentation and commentary 2730 2731 New file 'NEWS' that contains release notes like this one. 2732 2733 Paraguay's law does not specify DST transition time; 00:00 is customary. 2734 (Thanks to Waldemar Villamayor-Venialbo.) 2735 2736 Minor capitalization fixes. 2737 2738 Changes affecting version-control only 2739 2740 The experimental GitHub repository now contains annotated and 2741 signed tags for recent releases, e.g., '2013e' for Release 2013e. 2742 Releases are tagged starting with 2012e; earlier releases were 2743 done differently, and tags would either not have a simple name or 2744 not exactly match what was released. 2745 2746 'make set-timestamps' is now simpler and a bit more portable. 2747 2748 2749Release 2013e - 2013-09-19 23:50:04 -0700 2750 2751 Changes affecting near-future timestamps 2752 2753 This year Fiji will start DST on October 27, not October 20. 2754 (Thanks to David Wheeler for the heads-up.) For now, guess that 2755 Fiji will continue to spring forward the Sunday before the fourth 2756 Monday in October. 2757 2758 Changes affecting current and future time zone abbreviations 2759 2760 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 2761 time zone abbreviations since 1932. (Thanks to George Ziegler, 2762 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 2763 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 2764 Asia/Makassar, and Asia/Pontianak. 2765 2766 Use ART (UT -03, standard time), rather than WARST (also -03, but 2767 daylight saving time) for San Luis, Argentina since 2009. 2768 2769 Changes affecting Godthåb timestamps after 2037 if version mismatch 2770 2771 Allow POSIX-like TZ strings where the transition time's hour can 2772 range from -167 through 167, instead of the POSIX-required 0 2773 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 2774 new Fiji rules. This is a more-compact way to represent 2775 far-future timestamps for America/Godthab, America/Santiago, 2776 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 2777 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 2778 this change. (Derived from a suggestion by Arthur David Olson.) 2779 2780 Allow POSIX-like TZ strings where daylight saving time is in 2781 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 2782 Argentina Summer Time all year. This supports a more-compact way 2783 to represent the 2013d data for America/Argentina/San_Luis. 2784 Because of the change for San Luis noted above this change does not 2785 affect the current data. (Thanks to Andrew Main (Zefram) for 2786 suggestions that improved this change.) 2787 2788 Where these two TZ changes take effect, there is a minor extension 2789 to the tz file format in that it allows new values for the 2790 embedded TZ-format string, and the tz file format version number 2791 has therefore been increased from 2 to 3 as a precaution. 2792 Version-2-based client code should continue to work as before for 2793 all timestamps before 2038. Existing version-2-based client code 2794 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 2795 files, and typically works in practice even for timestamps after 2796 2037; the only known exception is America/Godthab. 2797 2798 Changes affecting timestamps before 1970 2799 2800 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 2801 some errors before 1947. 2802 2803 Some zones have been turned into links, when they differ from existing 2804 zones only in older data entries that were likely invented or that 2805 differ only in LMT or transitions from LMT. These changes affect 2806 only timestamps before 1943. The affected zones are: 2807 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 2808 America/Grenada, America/Guadeloupe, America/Marigot, 2809 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 2810 America/St_Lucia, America/St_Thomas, America/St_Vincent, 2811 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 2812 confirming that the old Europe/Vaduz zone was wrong and the new 2813 link is better for WWII-era times.) 2814 2815 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 2816 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 2817 from 1890 to 1912. 2818 2819 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 2820 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 2821 to Alois Treindl.) 2822 2823 Change the date of the circa-1850 Zurich transition from 1849-09-12 2824 to 1853-07-16, overriding Shanks with data from Messerli about 2825 postal and telegraph time in Switzerland. 2826 2827 Changes affecting time zone abbreviations before 1970 2828 2829 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 2830 as Jakarta was called Batavia back then. 2831 2832 Changes affecting API 2833 2834 The 'zic' command now outputs a dummy transition when far-future 2835 data can't be summarized using a TZ string, and uses a 402-year 2836 window rather than a 400-year window. For the current data, this 2837 affects only the Asia/Tehran file. It does not affect any of the 2838 timestamps that this file represents, so zdump outputs the same 2839 information as before. (Thanks to Andrew Main (Zefram).) 2840 2841 The 'date' command has a new '-r' option, which lets you specify 2842 the integer time to display, a la FreeBSD. 2843 2844 The 'tzselect' command has two new options '-c' and '-n', which lets you 2845 select a zone based on latitude and longitude. 2846 2847 The 'zic' command's '-v' option now warns about constructs that 2848 require the new version-3 binary file format. (Thanks to Arthur 2849 David Olson for the suggestion.) 2850 2851 Support for floating-point time_t has been removed. 2852 It was always dicey, and POSIX no longer requires it. 2853 (Thanks to Eric Blake for suggesting to the POSIX committee to 2854 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 2855 Heninger, Arthur David Olson, and Alois Treindl, for reporting 2856 bugs and elucidating some of the corners of the old floating-point 2857 implementation.) 2858 2859 The signatures of 'offtime', 'timeoff', and 'gtime' have been 2860 changed back to the old practice of using 'long' to represent UT 2861 offsets. This had been inadvertently and mistakenly changed to 2862 'int_fast32_t'. (Thanks to Christos Zoulas.) 2863 2864 The code avoids undefined behavior on integer overflow in some 2865 more places, including gmtime, localtime, mktime and zdump. 2866 2867 Changes affecting the zdump utility 2868 2869 zdump now outputs "UT" when referring to Universal Time, not "UTC". 2870 "UTC" does not make sense for timestamps that predate the introduction 2871 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen 2872 for clarifying UT vs UTC.) 2873 2874 Data changes affecting behavior of tzselect and similar programs 2875 2876 Country code BQ is now called the more-common name "Caribbean Netherlands" 2877 rather than the more-official "Bonaire, St Eustatius & Saba". 2878 2879 Remove from zone.tab the names America/Montreal, America/Shiprock, 2880 and Antarctica/South_Pole, as they are equivalent to existing 2881 same-country-code zones for post-1970 timestamps. The data entries for 2882 these names are unchanged, so the names continue to work as before. 2883 2884 Changes affecting code internals 2885 2886 zic -c now runs way faster on 64-bit hosts when given large numbers. 2887 2888 zic now uses vfprintf to avoid allocating and freeing some memory. 2889 2890 tzselect now computes the list of continents from the data, 2891 rather than have it hard-coded. 2892 2893 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 2894 2895 Changes affecting the build procedure 2896 2897 The 'leapseconds' file is now generated automatically from a 2898 new file 'leap-seconds.list', which is a copy of 2899 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 2900 A new source file 'leapseconds.awk' implements this. 2901 The goal is simplification of the future maintenance of 'leapseconds'. 2902 2903 When building the 'posix' or 'right' subdirectories, if the 2904 subdirectory would be a copy of the default subdirectory, it is 2905 now made a symbolic link if that is supported. This saves about 2906 2 MB of file system space. 2907 2908 The links America/Shiprock and Antarctica/South_Pole have been 2909 moved to the 'backward' file. This affects only nondefault builds 2910 that omit 'backward'. 2911 2912 Changes affecting version-control only 2913 2914 .gitignore now ignores 'date'. 2915 2916 Changes affecting documentation and commentary 2917 2918 Changes to the 'tzfile' man page 2919 2920 It now mentions that the binary file format may be extended in 2921 future versions by appending data. 2922 2923 It now refers to the 'zdump' and 'zic' man pages. 2924 2925 Changes to the 'zic' man page 2926 2927 It lists conditions that elicit a warning with '-v'. 2928 2929 It says that the behavior is unspecified when duplicate names 2930 are given, or if the source of one link is the target of another. 2931 2932 Its examples are updated to match the latest data. 2933 2934 The definition of white space has been clarified slightly. 2935 (Thanks to Michael Deckers.) 2936 2937 Changes to the 'Theory' file 2938 2939 There is a new section about the accuracy of the tz database, 2940 describing the many ways that errors can creep in, and 2941 explaining why so many of the pre-1970 timestamps are wrong or 2942 misleading (thanks to Steve Allen, Lester Caine, and Garrett 2943 Wollman for discussions that contributed to this). 2944 2945 The 'Theory' file describes LMT better (this follows a 2946 suggestion by Guy Harris). 2947 2948 It refers to the 2013 edition of POSIX rather than the 2004 edition. 2949 2950 It's mentioned that excluding 'backward' should not affect the 2951 other data, and it suggests at least one zone.tab name per 2952 inhabited country (thanks to Stephen Colebourne). 2953 2954 Some longstanding restrictions on names are documented, e.g., 2955 'America/New_York' precludes 'America/New_York/Bronx'. 2956 2957 It gives more reasons for the 1970 cutoff. 2958 2959 It now mentions which time_t variants are supported, such as 2960 signed integer time_t. (Thanks to Paul Goyette for reporting 2961 typos in an experimental version of this change.) 2962 2963 (Thanks to Philip Newton for correcting typos in these changes.) 2964 2965 Documentation and commentary is more careful to distinguish UT in 2966 general from UTC in particular. (Thanks to Steve Allen.) 2967 2968 Add a better source for the Zurich 1894 transition. 2969 (Thanks to Pierre-Yves Berger.) 2970 2971 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 2972 2973 2974Release 2013d - 2013-07-05 07:38:01 -0700 2975 2976 Changes affecting future timestamps: 2977 2978 Morocco's midsummer transitions this year are July 7 and August 10, 2979 not July 9 and August 8. (Thanks to Andrew Paprocki.) 2980 2981 Israel now falls back on the last Sunday of October. 2982 (Thanks to Ephraim Silverberg.) 2983 2984 Changes affecting past timestamps: 2985 2986 Specify Jerusalem's location more precisely; this changes the pre-1880 2987 times by 2 s. 2988 2989 Changing affecting metadata only: 2990 2991 Fix typos in the entries for country codes BQ and SX. 2992 2993 Changes affecting code: 2994 2995 Rework the code to fix a bug with handling Australia/Macquarie on 2996 32-bit hosts (thanks to Arthur David Olson). 2997 2998 Port to platforms like NetBSD, where time_t can be wider than long. 2999 3000 Add support for testing time_t types other than the system's. 3001 Run 'make check_time_t_alternatives' to try this out. 3002 Currently, the tests fail for unsigned time_t; 3003 this should get fixed at some point. 3004 3005 Changes affecting documentation and commentary: 3006 3007 Deemphasize the significance of national borders. 3008 3009 Update the zdump man page. 3010 3011 Remove obsolete NOID comment (thanks to Denis Excoffier). 3012 3013 Update several URLs and comments in the web pages. 3014 3015 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 3016 3017 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 3018 3019 3020Release 2013c - 2013-04-19 16:17:40 -0700 3021 3022 Changes affecting current and future timestamps: 3023 3024 Palestine observed DST starting March 29, 2013. (Thanks to 3025 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 3026 with the predicted rules being the last Thursday in March at 24:00 3027 to the first Friday on or after September 21 at 01:00. 3028 3029 Assume that the recent change to Paraguay's DST rules is permanent, 3030 by moving the end of DST to the 4th Sunday in March every year. 3031 (Thanks to Carlos Raúl Perasso.) 3032 3033 Changes affecting past timestamps: 3034 3035 Fix some historical data for Palestine to agree with that of 3036 timeanddate.com, as follows: 3037 3038 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 3039 00:00 Apr 1. 3040 3041 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 3042 02:00. 3043 3044 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 3045 3046 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 3047 3048 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 3049 3050 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 3051 3052 Fix times of habitation for Macquarie to agree with the Tasmania 3053 Parks & Wildlife Service history, which indicates that permanent 3054 habitation was 1899-1919 and 1948 on. 3055 3056 Changing affecting metadata only: 3057 3058 Macquarie Island is politically part of Australia, not Antarctica. 3059 (Thanks to Tobias Conradi.) 3060 3061 Sort Macquarie more-consistently with other parts of Australia. 3062 (Thanks to Tim Parenti.) 3063 3064 3065Release 2013b - 2013-03-10 22:33:40 -0700 3066 3067 Changes affecting current and future timestamps: 3068 3069 Haiti uses US daylight-saving rules this year, and presumably future years. 3070 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 3071 3072 Paraguay will end DST on March 24 this year. 3073 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 3074 3075 Morocco does not observe DST during Ramadan; 3076 try to predict Ramadan in Morocco as best we can. 3077 (Thanks to Erik Homoet for the heads-up.) 3078 3079 Changes affecting commentary: 3080 3081 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 3082 Update URL for Solaris. Mention Internet RFC 6557. 3083 Update Internet RFCs 2445->5545, 2822->5322. 3084 Switch from FTP to HTTP for Internet RFCs. 3085 3086 3087Release 2013a - 2013-02-27 09:20:35 -0800 3088 3089 Change affecting binary data format: 3090 3091 The zone offset at the end of version-2-format zone files is now 3092 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 3093 3094 Changes affecting current and future timestamps: 3095 3096 Chile's 2013 rules, and we guess rules for 2014 and later, will be 3097 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 3098 (Thanks to Steffen Thorsen and Robert Elz.) 3099 3100 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 3101 (Thanks to Tobias Conradi and Arthur David Olson.) 3102 3103 Many changes affect historical timestamps before 1940. 3104 These were deduced from: Milne J. Civil time. Geogr J. 1899 3105 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 3106 3107 Changes affecting the code: 3108 3109 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 3110 the data). (Thanks to Arthur David Olson.) 3111 3112 Fix localtime bug when time_t is unsigned and data files were generated 3113 by a signed time_t system. (Thanks to Doug Bailey for reporting and 3114 to Arthur David Olson for fixing.) 3115 3116 Allow the email address for bug reports to be set by the packager. 3117 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.) 3118 3119 Update HTML checking to be compatible with Ubuntu 12.10. 3120 3121 Check that files are a safe subset of ASCII. At some point we may 3122 relax this requirement to a safe subset of UTF-8. Without the 3123 check, some non-UTF-8 encodings were leaking into the distribution. 3124 3125 Commentary changes: 3126 3127 Restore a comment about copyright notices that was inadvertently deleted. 3128 (Thanks to Arthur David Olson.) 3129 3130 Improve the commentary about which districts observe what times 3131 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 3132 3133 Add web page links to tz.js. 3134 3135 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 3136 3137 3138Release 2012j - 2012-11-12 18:34:49 -0800 3139 3140 Libya moved to CET this weekend, but with DST planned next year. 3141 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 3142 3143 Signatures now have the extension .asc, not .sign, as that's more 3144 standard. (Thanks to Phil Pennock.) 3145 3146 The output of 'zdump --version', and of 'zic --version', now 3147 uses a format that is more typical for --version. 3148 (Thanks to Joseph S. Myers.) 3149 3150 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 3151 now uses tz@iana.org rather than the old elsie address. 3152 3153 zic -v now complains about abbreviations that are less than 3 3154 or more than 6 characters, as per Posix. Formerly, it checked 3155 for abbreviations that were more than 3. 3156 3157 'make public' no longer puts its temporary directory under /tmp, 3158 and uses the just-built zic rather than the system zic. 3159 3160 Various fixes to documentation and commentary. 3161 3162 3163Release 2012i - 2012-11-03 12:57:09 -0700 3164 3165 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 3166 3167 Linker flags can now be specified via LDFLAGS. 3168 AWK now defaults to 'awk', not 'nawk'. 3169 The shell in tzselect now defaults to /bin/bash, but this can 3170 be overridden by specifying KSHELL. 3171 The main web page now mentions the unofficial GitHub repository. 3172 (Thanks to Mike Frysinger.) 3173 3174 Tarball signatures can now be built by running 'make signatures'. 3175 There are also new makefile rules 'tarballs', 'check_public', and 3176 separate makefile rules for each tarball and signature file. 3177 A few makefile rules are now more portable to strict POSIX. 3178 3179 The main web page now lists the canonical IANA URL. 3180 3181 3182Release 2012h - 2012-10-26 22:49:10 -0700 3183 3184 Bahia no longer has DST. (Thanks to Kelley Cook.) 3185 3186 Tocantins has DST. (Thanks to Rodrigo Severo.) 3187 3188 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 3189 3190 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 3191 3192 Web page updates. 3193 3194 More C modernization, except that at Arthur David Olson's suggestion 3195 the instances of 'register' were kept. 3196 3197 3198Release 2012g - 2012-10-17 20:59:45 -0700 3199 3200 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 3201 3202 Palestine fall 2012. (Thanks to Steffen Thorsen.) 3203 3204 Assume C89. 3205 3206 To attack the version-number problem, this release ships the file 3207 'Makefile' (which contains the release number) in both the tzcode and 3208 the tzdata tarballs. The two Makefiles are identical, and should be 3209 identical in any matching pair of tarballs, so it shouldn't matter 3210 which order you extract the tarballs. Perhaps we can come up with a 3211 better version-number scheme at some point; this scheme does have the 3212 virtue of not adding more files. 3213 3214 3215Release 2012f - 2012-09-12 23:17:03 -0700 3216 3217 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 3218 20 this year. (Thanks to Steffen Thorsen.) 3219 3220 3221Release 2012e - 2012-08-02 20:44:55 -0700 3222 3223 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 3224 (Thanks to Steffen Thorsen.) 3225 3226 * Use a single version number for both code and data. 3227 3228 * .gitignore: New file. 3229 3230 * Remove trailing white space. 3231 3232 3233Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 3234 3235 Changes for Morocco's timestamps, which take effect in a couple of 3236 hours, along with infrastructure changes to accommodate how the tz 3237 code and data are released on IANA. 3238 3239 3240Release data2012c - 2012-03-27 12:17:25 -0400 3241 3242 africa 3243 Summer time changes for Morocco (to start late April 2012) 3244 3245 asia 3246 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 3247 3248 northamerica 3249 Haiti following US/Canada rules for 2012 (and we're assuming, 3250 for now anyway, for the future). 3251 3252 3253Release 2012b - 2012-03-02 12:29:15 +0700 3254 3255 There is just one change to tzcode2012b (compared with 2012a): 3256 the Makefile that was accidentally included with 2012a has been 3257 replaced with the version that should have been there, which is 3258 identical with the previous version (from tzcode2011i). 3259 3260 There are just two changes in tzdata2012b compared with 2012a. 3261 3262 Most significantly, summer time in Cuba has been delayed 3 weeks 3263 (now starts April 1 rather than March 11). Since Mar 11 (the old start 3264 date, as listed in 2012a) is just a little over a week away, this 3265 change is urgent. 3266 3267 Less importantly, an excess tab in one of the changes in zone.tab 3268 in 2012a has been removed. 3269 3270 3271Release 2012a - 2012-03-01 18:28:10 +0700 3272 3273 The changes in tzcode2012a (compared to the previous version, 2011i) 3274 are entirely to the README and tz-art.htm and tz-link.htm files, if 3275 none of those concern you, you can ignore the code update. The changes 3276 reflect the changed addresses for the mailing list and the code and 3277 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 3278 has been added to tz-link.htm). 3279 3280 In tzdata2012a (compared to the previous release, which was 2011n) 3281 the major changes are: 3282 Chile 2011/2012 and 2012/2013 summer time date adjustments. 3283 Falkland Islands onto permanent summer time (we're assuming for the 3284 foreseeable future, though 2012 is all we're fairly certain of.) 3285 Armenia has abolished Summer Time. 3286 Tokelau jumped the International Date Line back last December 3287 (just the same as their near neighbour, Samoa). 3288 America/Creston is a new zone for a small area of British Columbia 3289 There will be a leapsecond 2012-06-30 23:59:60 UTC. 3290 3291 Other minor changes are: 3292 Corrections to 1918 Canadian summer time end dates. 3293 Updated URL for UK time zone history (in comments) 3294 A few typos in Le Corre's list of free French place names (comments) 3295 3296 3297Release data2011n - 2011-10-30 14:57:54 +0700 3298 3299 There are three changes of note - most urgently, Cuba (America/Havana) 3300 has extended summer time by two weeks, now to end on Nov 13, rather than 3301 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 3302 (Europe/Tiraspol) decided not to split from the rest of Moldova after 3303 all, and consequently that zone has been removed (again) and reinstated 3304 in the "backward" file as a link to Europe/Chisinau. And third, the 3305 end date for Fiji's summer time this summer was moved forward from the 3306 earlier planned Feb 26, to Jan 22. 3307 3308 Apart from that, Moldova (MD) returns to a single entry in zone.tab 3309 (and the incorrect syntax that was in the 2011m version of that file 3310 is so fixed - it would have been fixed in a different way had this 3311 change not happened - that's the "missing" sccs version id). 3312 3313 3314Release data2011m - 2011-10-24 21:42:16 +0700 3315 3316 In particular, the typos in comments in the data (2011-11-17 should have 3317 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 3318 Tim Parenti noted) have been fixed, and the change for Ukraine has been 3319 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to 3320 Tim Parenti, and also Denys Gavrysh) 3321 3322 In addition, I added Europe/Tiraspol to zone.tab. 3323 3324 This time, all the files have new version numbers... (including the files 3325 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 3326 version numbers there...) 3327 3328 3329Release data2011l - 2011-10-10 11:15:43 +0700 3330 3331 There are just 2 changes that cause different generated tzdata files from 3332 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 3333 is included, but commented out. Compared with the diff I sent out last week, 3334 this version also includes attributions for the sources for the changes 3335 (in much the same format as ado used, but the html tags have not been 3336 checked, verified, or used in any way at all, so if there are errors there, 3337 please let me know.) 3338 3339 3340Release data2011k - 2011-09-20 17:54:03 -0400 3341 3342 [not summarized] 3343 3344 3345Release data2011j - 2011-09-12 09:22:49 -0400 3346 3347 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 3348 Tanzania); there are also two spelling corrections to comments in 3349 the australasia file (with thanks to Christos Zoulas). 3350 3351 3352Release 2011i - 2011-08-29 05:56:32 -0400 3353 3354 [not summarized] 3355 3356 3357Release data2011h - 2011-06-15 18:41:48 -0400 3358 3359 Russia and Curaçao changes 3360 3361 3362Release 2011g - 2011-04-25 09:07:22 -0400 3363 3364 update the rules for Egypt to reflect its abandonment of DST this year 3365 3366 3367Release 2011f - 2011-04-06 17:14:53 -0400 3368 3369 [not summarized] 3370 3371 3372Release 2011e - 2011-03-31 16:04:38 -0400 3373 3374 Morocco, Chile, and tz-link changes 3375 3376 3377Release 2011d - 2011-03-14 09:18:01 -0400 3378 3379 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 3380 3381 3382Release 2011c - 2011-03-07 09:30:09 -0500 3383 3384 These do affect current timestamps in Chile and Annette Island, Canada. 3385 3386 3387Release 2011b - 2011-02-07 08:44:50 -0500 3388 3389 [not summarized] 3390 3391 3392Release 2011a - 2011-01-24 10:30:16 -0500 3393 3394 [not summarized] 3395 3396 3397Release data2010o - 2010-11-01 09:18:23 -0400 3398 3399 change to the end of DST in Fiji in 2011 3400 3401 3402Release 2010n - 2010-10-25 08:19:17 -0400 3403 3404 [not summarized] 3405 3406 3407Release 2010m - 2010-09-27 09:24:48 -0400 3408 3409 Hong Kong, Vostok, and zic.c changes 3410 3411 3412Release 2010l - 2010-08-16 06:57:25 -0400 3413 3414 [not summarized] 3415 3416 3417Release 2010k - 2010-07-26 10:42:27 -0400 3418 3419 [not summarized] 3420 3421 3422Release 2010j - 2010-05-10 09:07:48 -0400 3423 3424 changes for Bahía de Banderas and for version naming 3425 3426 3427Release data2010i - 2010-04-16 18:50:45 -0400 3428 3429 the end of DST in Morocco on 2010-08-08 3430 3431 3432Release data2010h - 2010-04-05 09:58:56 -0400 3433 3434 [not summarized] 3435 3436 3437Release data2010g - 2010-03-24 11:14:53 -0400 3438 3439 [not summarized] 3440 3441 3442Release 2010f - 2010-03-22 09:45:46 -0400 3443 3444 [not summarized] 3445 3446 3447Release data2010e - 2010-03-08 14:24:27 -0500 3448 3449 corrects the Dhaka bug found by Danvin Ruangchan 3450 3451 3452Release data2010d - 2010-03-06 07:26:01 -0500 3453 3454 [not summarized] 3455 3456 3457Release 2010c - 2010-03-01 09:20:58 -0500 3458 3459 changes including KRE's suggestion for earlier initialization of 3460 "goahead" and "goback" structure elements 3461 3462 3463Release code2010a - 2010-02-16 10:40:04 -0500 3464 3465 [not summarized] 3466 3467 3468Release data2010b - 2010-01-20 12:37:01 -0500 3469 3470 Mexico changes 3471 3472 3473Release data2010a - 2010-01-18 08:30:04 -0500 3474 3475 changes to Dhaka 3476 3477 3478Release data2009u - 2009-12-26 08:32:28 -0500 3479 3480 changes to DST in Bangladesh 3481 3482 3483Release 2009t - 2009-12-21 13:24:27 -0500 3484 3485 [not summarized] 3486 3487 3488Release data2009s - 2009-11-14 10:26:32 -0500 3489 3490 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 3491 3492 3493Release 2009r - 2009-11-09 10:10:31 -0500 3494 3495 "antarctica" and "tz-link.htm" changes 3496 3497 3498Release 2009q - 2009-11-02 09:12:40 -0500 3499 3500 with two corrections as reported by Eric Muller and Philip Newton 3501 3502 3503Release data2009p - 2009-10-23 15:05:27 -0400 3504 3505 Argentina (including San Luis) changes (with the correction from 3506 Mariano Absatz) 3507 3508 3509Release data2009o - 2009-10-14 16:49:38 -0400 3510 3511 Samoa (commentary only), Pakistan, and Bangladesh changes 3512 3513 3514Release data2009n - 2009-09-22 15:13:38 -0400 3515 3516 added commentary for Argentina and a change to the end of DST in 3517 2009 in Pakistan 3518 3519 3520Release data2009m - 2009-09-03 10:23:43 -0400 3521 3522 Samoa and Palestine changes 3523 3524 3525Release data2009l - 2009-08-14 09:13:07 -0400 3526 3527 Samoa (comments only) and Egypt 3528 3529 3530Release 2009k - 2009-07-20 09:46:08 -0400 3531 3532 [not summarized] 3533 3534 3535Release data2009j - 2009-06-15 06:43:59 -0400 3536 3537 Bangladesh change (with a short turnaround since the DST change is 3538 impending) 3539 3540 3541Release 2009i - 2009-06-08 09:21:22 -0400 3542 3543 updating for DST in Bangladesh this year 3544 3545 3546Release 2009h - 2009-05-26 09:19:14 -0400 3547 3548 [not summarized] 3549 3550 3551Release data2009g - 2009-04-20 16:34:07 -0400 3552 3553 Cairo 3554 3555 3556Release data2009f - 2009-04-10 11:00:52 -0400 3557 3558 correct DST in Pakistan 3559 3560 3561Release 2009e - 2009-04-06 09:08:11 -0400 3562 3563 [not summarized] 3564 3565 3566Release 2009d - 2009-03-23 09:38:12 -0400 3567 3568 Morocco, Tunisia, Argentina, and American Astronomical Society changes 3569 3570 3571Release data2009c - 2009-03-16 09:47:51 -0400 3572 3573 change to the start of Cuban DST 3574 3575 3576Release 2009b - 2009-02-09 11:15:22 -0500 3577 3578 [not summarized] 3579 3580 3581Release 2009a - 2009-01-21 10:09:39 -0500 3582 3583 [not summarized] 3584 3585 3586Release data2008i - 2008-10-21 12:10:25 -0400 3587 3588 southamerica and zone.tab files, with Argentina DST rule changes and 3589 United States zone reordering and recommenting 3590 3591 3592Release 2008h - 2008-10-13 07:33:56 -0400 3593 3594 [not summarized] 3595 3596 3597Release 2008g - 2008-10-06 09:03:18 -0400 3598 3599 Fix a broken HTML anchor and update Brazil's DST transitions; 3600 there's also a slight reordering of information in tz-art.htm. 3601 3602 3603Release data2008f - 2008-09-09 22:33:26 -0400 3604 3605 [not summarized] 3606 3607 3608Release 2008e - 2008-07-28 14:11:17 -0400 3609 3610 changes by Arthur David Olson and Jesper Nørgaard Welen 3611 3612 3613Release data2008d - 2008-07-07 09:51:38 -0400 3614 3615 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 3616 3617 3618Release data2008c - 2008-05-19 17:48:03 -0400 3619 3620 Pakistan, Morocco, and Mongolia 3621 3622 3623Release data2008b - 2008-03-24 08:30:59 -0400 3624 3625 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 3626 link provided 3627 3628 3629Release 2008a - 2008-03-08 05:42:16 -0500 3630 3631 [not summarized] 3632 3633 3634Release 2007k - 2007-12-31 10:25:22 -0500 3635 3636 most importantly, changes to the "southamerica" file based on 3637 Argentina's readoption of daylight saving time 3638 3639 3640Release 2007j - 2007-12-03 09:51:01 -0500 3641 3642 1. eliminate the "P" (parameter) macro; 3643 3644 2. the "noncontroversial" changes circulated on the time zone 3645 mailing list (less the changes to "logwtmp.c"); 3646 3647 3. eliminate "too many transition" errors when "min" is used in time 3648 zone rules; 3649 3650 4. changes by Paul Eggert (including updated information for Venezuela). 3651 3652 3653Release data2007i - 2007-10-30 10:28:11 -0400 3654 3655 changes for Cuba and Syria 3656 3657 3658Release 2007h - 2007-10-01 10:05:51 -0400 3659 3660 changes by Paul Eggert, as well as an updated link to the ICU 3661 project in tz-link.htm 3662 3663 3664Release 2007g - 2007-08-20 10:47:59 -0400 3665 3666 changes by Paul Eggert 3667 3668 The "leapseconds" file has been updated to incorporate the most 3669 recent International Earth Rotation and Reference Systems Service 3670 (IERS) bulletin. 3671 3672 There's an addition to tz-art.htm regarding the television show "Medium". 3673 3674 3675Release 2007f - 2007-05-07 10:46:46 -0400 3676 3677 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 3678 Zealand) 3679 3680 changes to zic.c to allow hour values greater than 24 (along with 3681 Paul's improved time value overflow checking) 3682 3683 3684Release 2007e - 2007-04-02 10:11:52 -0400 3685 3686 Syria and Honduras changes by Paul Eggert 3687 3688 zic.c variable renaming changes by Arthur David Olson 3689 3690 3691Release 2007d - 2007-03-20 08:48:30 -0400 3692 3693 changes by Paul Eggert 3694 3695 the elimination of white space at the ends of lines 3696 3697 3698Release 2007c - 2007-02-26 09:09:37 -0500 3699 3700 changes by Paul Eggert 3701 3702 3703Release 2007b - 2007-02-12 09:34:20 -0500 3704 3705 Paul Eggert's proposed change to the quotation handling logic in zic.c. 3706 3707 changes to the commentary in "leapseconds" reflecting the IERS 3708 announcement that there is to be no positive leap second at the end 3709 of June 2007. 3710 3711 3712Release 2007a - 2007-01-08 12:28:29 -0500 3713 3714 changes by Paul Eggert 3715 3716 Derick Rethan's Asmara change 3717 3718 Oscar van Vlijmen's Easter Island local mean time change 3719 3720 symbolic link changes 3721 3722 3723Release 2006p - 2006-11-27 08:54:27 -0500 3724 3725 changes by Paul Eggert 3726 3727 3728Release 2006o - 2006-11-06 09:18:07 -0500 3729 3730 changes by Paul Eggert 3731 3732 3733Release 2006n - 2006-10-10 11:32:06 -0400 3734 3735 changes by Paul Eggert 3736 3737 3738Release 2006m - 2006-10-02 15:32:35 -0400 3739 3740 changes for Uruguay, Palestine, and Egypt by Paul Eggert 3741 3742 (minimalist) changes to zic.8 to clarify "until" information 3743 3744 3745Release data2006l - 2006-09-18 12:58:11 -0400 3746 3747 Paul's best-effort work on this coming weekend's Egypt time change 3748 3749 3750Release 2006k - 2006-08-28 12:19:09 -0400 3751 3752 changes by Paul Eggert 3753 3754 3755Release 2006j - 2006-08-21 09:56:32 -0400 3756 3757 changes by Paul Eggert 3758 3759 3760Release code2006i - 2006-08-07 12:30:55 -0400 3761 3762 localtime.c fixes 3763 3764 Ken Pizzini's conversion script 3765 3766 3767Release code2006h - 2006-07-24 09:19:37 -0400 3768 3769 adds public domain notices to four files 3770 3771 includes a fix for transition times being off by a second 3772 3773 adds a new recording to the "arts" file (information courtesy Colin Bowern) 3774 3775 3776Release 2006g - 2006-05-08 17:18:09 -0400 3777 3778 northamerica changes by Paul Eggert 3779 3780 3781Release 2006f - 2006-05-01 11:46:00 -0400 3782 3783 a missing version number problem is fixed (with thanks to Bradley 3784 White for catching the problem) 3785 3786 3787Release 2006d - 2006-04-17 14:33:43 -0400 3788 3789 changes by Paul Eggert 3790 3791 added new items to tz-arts.htm that were found by Paul 3792 3793 3794Release 2006c - 2006-04-03 10:09:32 -0400 3795 3796 two sets of data changes by Paul Eggert 3797 3798 a fencepost error fix in zic.c 3799 3800 changes to zic.c and the "europe" file to minimize differences 3801 between output produced by the old 32-bit zic and the new 64-bit 3802 version 3803 3804 3805Release 2006b - 2006-02-20 10:08:18 -0500 3806 [tz32code2006b + tz64code2006b + tzdata2006b] 3807 3808 64-bit code 3809 3810 All SCCS IDs were bumped to "8.1" for this release. 3811 3812 3813Release 2006a - 2006-01-30 08:59:31 -0500 3814 3815 changes by Paul Eggert (in particular, Indiana time zone moves) 3816 3817 an addition to the zic manual page to describe how special-case 3818 transitions are handled 3819 3820 3821Release 2005r - 2005-12-27 09:27:13 -0500 3822 3823 Canadian changes by Paul Eggert 3824 3825 They also add "<pre>" directives to time zone data files and reflect 3826 changes to warning message logic in "zdump.c" (but with calls to 3827 "gettext" kept unbundled at the suggestion of Ken Pizzini). 3828 3829 3830Release 2005q - 2005-12-13 09:17:09 -0500 3831 3832 Nothing earth-shaking here: 3833 1. Electronic mail addresses have been removed. 3834 2. Casts of the return value of exit have been removed. 3835 3. Casts of the argument of is.* macros have been added. 3836 4. Indentation in one section of zic.c has been fixed. 3837 5. References to dead URLs in the data files have been dealt with. 3838 3839 3840Release 2005p - 2005-12-05 10:30:53 -0500 3841 3842 "systemv", "tz-link.htm", and "zdump.c" changes 3843 (less the casts of arguments to the is* macros) 3844 3845 3846Release 2005o - 2005-11-28 10:55:26 -0500 3847 3848 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 3849 3850 zdump.c lint fixes by Arthur David Olson 3851 3852 3853Release 2005n - 2005-10-03 09:44:09 -0400 3854 3855 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 3856 et al. changes) 3857 3858 3859Release 2005m - 2005-08-29 12:15:40 -0400 3860 3861 changes by Paul Eggert (with a small tweak to the tz-art change) 3862 3863 a declaration of an unused variable has been removed from zdump.c 3864 3865 3866Release 2005l - 2005-08-22 12:06:39 -0400 3867 3868 changes by Paul Eggert 3869 3870 overflow/underflow checks by Arthur David Olson, minus changes to 3871 the "Theory" file about the pending addition of 64-bit data (I grow 3872 less confident of the changes being accepted with each passing day, 3873 and the changes no longer increase the data files nine-fold--there's 3874 less than a doubling in size by my local Sun's reckoning) 3875 3876 3877Release 2005k - 2005-07-14 14:14:24 -0400 3878 3879 The "leapseconds" file has been edited to reflect the recently 3880 announced leap second at the end of 2005. 3881 3882 I've also deleted electronic mail addresses from the files as an 3883 anti-spam measure. 3884 3885 3886Release 2005j - 2005-06-13 14:34:13 -0400 3887 3888 These reflect changes to limit the length of time zone abbreviations 3889 and the characters used in those abbreviations. 3890 3891 There are also changes to handle POSIX-style "quoted" timezone 3892 environment variables. 3893 3894 The changes were circulated on the time zone mailing list; the only 3895 change since then was the removal of a couple of minimum-length of 3896 abbreviation checks. 3897 3898 3899Release data2005i - 2005-04-21 15:04:16 -0400 3900 3901 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 3902 3903 3904Release 2005h - 2005-04-04 11:24:47 -0400 3905 3906 changes by Paul Eggert 3907 3908 minor changes to Makefile and zdump.c to produce more useful output 3909 when doing a "make typecheck" 3910 3911 3912Release 2005g - 2005-03-14 10:11:21 -0500 3913 3914 changes by Paul Eggert (a change to current DST rules in Uruguay and 3915 an update to a link to time zone software) 3916 3917 3918Release 2005f - 2005-03-01 08:45:32 -0500 3919 3920 data and documentation changes by Paul Eggert 3921 3922 3923Release 2005e - 2005-02-10 15:59:44 -0500 3924 3925 [not summarized] 3926 3927 3928Release code2005d - 2005-01-31 09:21:47 -0500 3929 3930 make zic complain about links to links if the -v flag is used 3931 3932 have "make public" do more code checking 3933 3934 add an include to "localtime.c" for the benefit of gcc systems 3935 3936 3937Release 2005c - 2005-01-17 18:36:29 -0500 3938 3939 get better results when mktime runs on a system where time_t is double 3940 3941 changes to the data files (most importantly to Paraguay) 3942 3943 3944Release 2005b - 2005-01-10 09:19:54 -0500 3945 3946 Get localtime and gmtime working on systems with exotic time_t types. 3947 3948 Update the leap second commentary in the "leapseconds" file. 3949 3950 3951Release 2005a - 2005-01-01 13:13:44 -0500 3952 3953 [not summarized] 3954 3955 3956Release code2004i - 2004-12-14 13:42:58 -0500 3957 3958 Deal with systems where time_t is unsigned. 3959 3960 3961Release code2004h - 2004-12-07 11:40:18 -0500 3962 3963 64-bit-time_t changes 3964 3965 3966Release 2004g - 2004-11-02 09:06:01 -0500 3967 3968 update to Cuba (taking effect this weekend) 3969 3970 other changes by Paul Eggert 3971 3972 correction of the spelling of Oslo 3973 3974 changed versions of difftime.c and private.h 3975 3976 3977Release code2004f - 2004-10-21 10:25:22 -0400 3978 3979 Cope with wide-ranging tm_year values. 3980 3981 3982Release 2004e - 2004-10-11 14:47:21 -0400 3983 3984 Brazil/Argentina/Israel changes by Paul Eggert 3985 3986 changes to tz-link.htm by Paul 3987 3988 one small fix to Makefile 3989 3990 3991Release 2004d - 2004-09-22 08:27:29 -0400 3992 3993 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 3994 3995 3996Release 2004c - 2004-08-11 12:06:26 -0400 3997 3998 asctime-related changes 3999 4000 (variants of) some of the documentation changes suggested by Paul Eggert 4001 4002 4003Release 2004b - 2004-07-19 14:33:35 -0400 4004 4005 data changes by Paul Eggert - most importantly, updates for Argentina 4006 4007 4008Release 2004a - 2004-05-27 12:00:47 -0400 4009 4010 changes by Paul Eggert 4011 4012 Handle DST transitions that occur at the end of a month in some 4013 years but at the start of the following month in other years. 4014 4015 Add a copy of the correspondence that's the basis for claims about 4016 DST in the Navajo Nation. 4017 4018 4019Release 2003e - 2003-12-15 09:36:47 -0500 4020 4021 changes by Arthur David Olson (primarily code changes) 4022 4023 changes by Paul Eggert (primarily data changes) 4024 4025 minor changes to "Makefile" and "northamerica" (in the latter case, 4026 optimization of the "Toronto" rules) 4027 4028 4029Release 2003d - 2003-10-06 09:34:44 -0400 4030 4031 changes by Paul Eggert 4032 4033 4034Release 2003c - 2003-09-16 10:47:05 -0400 4035 4036 Fix bad returns in zic.c's inleap function. 4037 Thanks to Bradley White for catching the problem! 4038 4039 4040Release 2003b - 2003-09-16 07:13:44 -0400 4041 4042 Add a "--version" option (and documentation) to the zic and zdump commands. 4043 4044 changes to overflow/underflow checking in zic 4045 4046 a localtime typo fix. 4047 4048 Update the leapseconds and tz-art.htm files. 4049 4050 4051Release 2003a - 2003-03-24 09:30:54 -0500 4052 4053 changes by Paul Eggert 4054 4055 a few additions and modifications to the tz-art.htm file 4056 4057 4058Release 2002d - 2002-10-15 13:12:42 -0400 4059 4060 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 4061 4062 There's also a new time zone quote in "tz-art.htm". 4063 4064 4065Release 2002c - 2002-04-04 11:55:20 -0500 4066 4067 changes by Paul Eggert 4068 4069 Change zic.c to avoid creating symlinks to files that don't exist. 4070 4071 4072Release 2002b - 2002-01-28 12:56:03 -0500 4073 4074 [These change notes are for Release 2002a, which was corrupted. 4075 2002b was a corrected version of 2002a.] 4076 4077 changes by Paul Eggert 4078 4079 Update the "leapseconds" file to note that there'll be no leap 4080 second at the end of June, 2002. 4081 4082 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 4083 4084 Change to "difftime.c" to avoid sizeof problems. 4085 4086 4087Release 2001d - 2001-10-09 13:31:32 -0400 4088 4089 changes by Paul Eggert 4090 4091 4092Release 2001c - 2001-06-05 13:59:55 -0400 4093 4094 changes by Paul Eggert and Andrew Brown 4095 4096 4097Release 2001b - 2001-04-05 16:44:38 -0400 4098 4099 changes by Paul Eggert (modulo jnorgard's typo fix) 4100 4101 tz-art.htm has been HTMLified. 4102 4103 4104Release 2001a - 2001-03-13 12:57:44 -0500 4105 4106 changes by Paul Eggert 4107 4108 An addition to the "leapseconds" file: comments with the text of the 4109 latest IERS leap second notice. 4110 4111 Trailing white space has been removed from data file lines, and 4112 repeated spaces in "Rule Jordan" lines in the "asia" file have been 4113 converted to tabs. 4114 4115 4116Release 2000h - 2000-12-14 15:33:38 -0500 4117 4118 changes by Paul Eggert 4119 4120 one typo fix in the "art" file 4121 4122 With providence, this is the last update of the millennium. 4123 4124 4125Release 2000g - 2000-10-10 11:35:22 -0400 4126 4127 changes by Paul Eggert 4128 4129 correction of John Mackin's name submitted by Robert Elz 4130 4131 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 4132 Emmy Awards broadcast. 4133 4134 4135Release 2000f - 2000-08-10 09:31:58 -0400 4136 4137 changes by Paul Eggert 4138 4139 Added information in "tz-art.htm" on a Seinfeld reference to DST. 4140 4141 Error checking and messages in the "yearistype" script have been 4142 improved. 4143 4144 4145Release 2000e - 2000-07-31 09:27:54 -0400 4146 4147 data changes by Paul Eggert 4148 4149 a change to the default value of the defined constant HAVE_STRERROR 4150 4151 the addition of a Dave Barry quote on DST to the tz-arts file 4152 4153 4154Release 2000d - 2000-04-20 15:43:04 -0400 4155 4156 changes to the documentation and code of strftime for C99 conformance 4157 4158 a bug fix for date.c 4159 4160 These are based on (though modified from) changes by Paul Eggert. 4161 4162 4163Release 2000c - 2000-03-04 10:31:43 -0500 4164 4165 changes by Paul Eggert 4166 4167 4168Release 2000b - 2000-02-21 12:16:29 -0500 4169 4170 changes by Paul Eggert and Joseph Myers 4171 4172 modest tweaks to the tz-art.htm and tz-link.htm files 4173 4174 4175Release 2000a - 2000-01-18 09:21:26 -0500 4176 4177 changes by Paul Eggert 4178 4179 The two hypertext documents have also been renamed. 4180 4181 4182Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 4183 4184 Paul Eggert's changes 4185 4186 additions to the "zic" manual page and the "Arts.htm" file 4187 4188 4189Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 4190 4191 [not summarized] 4192 4193 4194Release data1999h - 1999-10-07 03:50:29 -0400 4195 4196 changes by Paul Eggert to "europe" (most importantly, fixing 4197 Lithuania and Estonia) 4198 4199 4200Release 1999g - 1999-09-28 11:06:18 -0400 4201 4202 data changes by Paul Eggert (most importantly, the change for 4203 Lebanon that buys correctness for this coming Sunday) 4204 4205 The "code" file contains changes to "Makefile" and "checktab.awk" to 4206 allow better checking of time zone files before they are published. 4207 4208 4209Release 1999f - 1999-09-23 09:48:14 -0400 4210 4211 changes by Arthur David Olson and Paul Eggert 4212 4213 4214Release 1999e - 1999-08-17 15:20:54 -0400 4215 4216 changes circulated by Paul Eggert, although the change to handling 4217 of DST-specifying timezone names has been commented out for now 4218 (search for "XXX" in "localtime.c" for details). These files also 4219 do not make any changes to the start of DST in Brazil. 4220 4221 In addition to Paul's changes, there are updates to "Arts.htm" and 4222 cleanups of URLs. 4223 4224 4225Release 1999d - 1999-03-30 11:31:07 -0500 4226 4227 changes by Paul Eggert 4228 4229 The Makefile's "make public" rule has also been changed to do a test 4230 compile of each individual time zone data file (which should help 4231 avoid problems such as the one we had with Nicosia). 4232 4233 4234Release 1999c - 1999-03-25 09:47:47 -0500 4235 4236 changes by Paul Eggert, most importantly the change for Chile. 4237 4238 4239Release 1999b - 1999-02-01 17:51:44 -0500 4240 4241 changes by Paul Eggert 4242 4243 code changes (suggested by Mani Varadarajan, mani at be.com) for 4244 correct handling of symbolic links when building using a relative directory 4245 4246 code changes to generate correct messages for failed links 4247 4248 updates to the URLs in Arts.htm 4249 4250 4251Release 1999a - 1999-01-19 16:20:29 -0500 4252 4253 error message internationalizations and corrections in zic.c and 4254 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 4255 to whom thanks!) 4256 4257 4258Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 4259 4260 changes for Brazil, Chile, and Germany 4261 4262 support for use of "24:00" in the input files for the time zone compiler 4263 4264 4265Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 4266 4267 changes by Paul Eggert 4268 4269 correction to a define in the "private.h" file 4270 4271 4272Release data1998g - 1998-08-11 03:28:35 -0000 4273 [tzdata1998g.tar.gz is missing!] 4274 4275 Lithuanian change provided by mgedmin at pub.osf.it 4276 4277 Move creation of the GMT link with Etc/GMT to "etcetera" (from 4278 "backward") to ensure that the GMT file is created even where folks 4279 don't want the "backward" links (as suggested by Paul Eggert). 4280 4281 4282Release data1998f - 1998-07-20 13:50:00 -0000 4283 [tzdata1998f.tar.gz is missing!] 4284 4285 Update the "leapseconds" file to include the newly-announced 4286 insertion at the end of 1998. 4287 4288 4289Release code1998f - 1998-06-01 10:18:31 -0400 4290 4291 addition to localtime.c by Guy Harris 4292 4293 4294Release 1998e - 1998-05-28 09:56:26 -0400 4295 4296 The Makefile is changed to produce zoneinfo-posix rather than 4297 zoneinfo/posix, and to produce zoneinfo-leaps rather than 4298 zoneinfo/right. 4299 4300 data changes by Paul Eggert 4301 4302 changes from Guy Harris to provide asctime_r and ctime_r 4303 4304 A usno1998 file (substantially identical to usno1997) has been added. 4305 4306 4307Release 1998d - 1998-05-14 11:58:34 -0400 4308 4309 changes to comments (in particular, elimination of references to CIA maps). 4310 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 4311 where changes occur. 4312 4313 4314Release 1998c - 1998-02-28 12:32:26 -0500 4315 4316 changes by Paul Eggert (save the "French correction," on which I'll 4317 wait for the dust to settle) 4318 4319 symlink changes 4320 4321 changes and additions to Arts.htm 4322 4323 4324Release 1998b - 1998-01-17 14:31:51 -0500 4325 4326 URL cleanups and additions 4327 4328 4329Release 1998a - 1998-01-13 12:37:35 -0500 4330 4331 changes by Paul Eggert 4332 4333 4334Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 4335 4336 changes by Paul Eggert, with minor modifications from Arthur David 4337 Olson to make the files more browser friendly 4338 4339 4340Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 4341 4342 minor changes to put "TZif" at the start of each timezone information file 4343 4344 a rule has also been added to the Makefile so you can 4345 make zones 4346 to just recompile the zone information files (rather than doing a 4347 full "make install" with its other effects). 4348 4349 4350Release data1997i - 1997-10-07 08:45:38 -0400 4351 4352 changes to Africa by Paul Eggert 4353 4354 4355Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 4356 4357 corrections for Uruguay (and other locations) 4358 4359 Arthur David Olson's simple-minded fix allowing mktime to both 4360 correctly handle leap seconds and correctly handle tm_sec values 4361 upon which arithmetic has been performed. 4362 4363 4364Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 4365 4366 Paul Eggert's updates 4367 4368 a small change to a function prototype; 4369 4370 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 4371 include information on Around the World in Eighty Days. 4372 4373 4374Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 4375 4376 fixes to zic's error handling 4377 4378 changes inspired by the item circulated on Slovenia 4379 4380 The description of Web resources has been HTMLified for browsing 4381 convenience. 4382 4383 A new piece of tz-related music has been added to the "Music" file. 4384 4385 4386Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 4387 4388 Paul Eggert's latest suggestions 4389 4390 4391Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 4392 4393 changes to "zic.c" to correct performance of the "-s" option 4394 4395 a new file "usno1997" 4396 4397 4398Release data1997c - 1997-03-04 09:58:18 -0500 4399 4400 changes in Israel 4401 4402 4403Release 1997b - 1997-02-27 18:34:19 -0500 4404 4405 The data file incorporates the 1997 leap second. 4406 4407 The code file incorporates Arthur David Olson's take on the 4408 zic/multiprocessor/directory-creation situation. 4409 4410 4411Release 1997a - 1997-01-21 09:11:10 -0500 4412 4413 Paul Eggert's Antarctica (and other changes) 4414 4415 Arthur David Olson finessed the "getopt" issue by checking against 4416 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 4417 is returned while SunOS 5.5's manual says EOF is returned). 4418 4419 4420Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 4421 4422 Paul Eggert's latest changes 4423 4424 4425Release code1996n - 1996-12-16 09:42:02 -0500 4426 4427 link snapping fix from Bruce Evans (via Garrett Wollman) 4428 4429 4430Release data1996m - 1996-11-24 02:37:34 -0000 4431 [tzdata1996m.tar.gz is missing!] 4432 4433 Paul Eggert's batch of changes 4434 4435 4436Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 4437 4438 No functional changes here; the files have simply been changed to 4439 make more use of ISO style dates in comments. The names of the above 4440 files now include the year in full. 4441 4442 4443Release code96l - 1996-09-08 17:12:20 -0400 4444 4445 tzcode96k was missing a couple of pieces. 4446 4447 4448Release 96k - 1996-09-08 16:06:22 -0400 4449 4450 the latest round of changes from Paul Eggert 4451 4452 the recent Year 2000 material 4453 4454 4455Release code96j - 1996-07-30 13:18:53 -0400 4456 4457 Set sp->typecnt as suggested by Timothy Patrick Murphy. 4458 4459 4460Release code96i - 1996-07-27 20:11:35 -0400 4461 4462 Paul's suggested patch for strftime %V week numbers 4463 4464 4465Release data96i - 1996-07-01 18:13:04 -0400 4466 4467 "northamerica" and "europe" changes by Paul Eggert 4468 4469 4470Release code96h - 1996-06-05 08:02:21 -0400 4471 4472 fix for handling transitions specified in Universal Time 4473 4474 Some "public domain" notices have also been added. 4475 4476 4477Release code96g - 1996-05-16 14:00:26 -0400 4478 4479 fix for the simultaneous-DST-and-zone-change challenge 4480 4481 4482Release data96h - 1996-05-09 17:40:51 -0400 4483 4484 changes by Paul Eggert 4485 4486 4487Release code96f-data96g - 1996-05-03 03:09:59 -0000 4488 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 4489 4490 The changes get us some of the way to fixing the problems noted in Paul 4491 Eggert's letter yesterday (in addition to a few others). The approach 4492 has been to make zic a bit smarter about figuring out what time zone 4493 abbreviations apply just after the time specified in the "UNTIL" part 4494 of a zone line. Putting the smarts in zic means avoiding having 4495 transition times show up in both "Zone" lines and "Rule" lines, which 4496 in turn avoids multiple transition time entries in time zone files. 4497 (This also makes the zic input files such as "europe" a bit shorter and 4498 should ease maintenance.) 4499 4500 4501Release data96f - 1996-04-19 19:20:03 -0000 4502 [tzdata96f.tar.gz is missing!] 4503 4504 The only changes are to the "northamerica" file; the time zone 4505 abbreviation for Denver is corrected to MST (and MDT), and the 4506 comments for Mexico have been updated. 4507 4508 4509Release data96e - 1996-03-19 17:37:26 -0500 4510 4511 Proposals by Paul Eggert, in particular the Portugal change that 4512 comes into play at the end of this month. 4513 4514 4515Release data96d - 1996-03-18 20:49:39 -0500 4516 4517 [not summarized] 4518 4519 4520Release code96e - 1996-02-29 15:43:27 -0000 4521 [tzcode96e.tar.gz is missing!] 4522 4523 internationalization changes and the fix to the documentation for strftime 4524 4525 4526Release code96d-data96c - 1996-02-12 11:05:27 -0500 4527 4528 The "code" file simply updates Bob Kridle's electronic address. 4529 4530 The "data" file updates rules for Mexico. 4531 4532 4533Release data96b - 1996-01-27 15:44:42 -0500 4534 4535 Kiribati change 4536 4537 4538Release code96c - 1996-01-16 16:58:15 -0500 4539 4540 leap-year streamlining and binary-search changes 4541 4542 fix to newctime.3 4543 4544 4545Release code96b - 1996-01-10 20:42:39 -0500 4546 4547 fixes and enhancements from Paul Eggert, including code that 4548 emulates the behavior of recent versions of the SunOS "date" 4549 command. 4550 4551 4552Release 96a - 1996-01-06 09:08:24 -0500 4553 4554 Israel updates 4555 4556 fixes to strftime.c for correct ISO 8601 week number generation, 4557 plus support for two new formats ('G' and 'g') to give ISO 8601 year 4558 numbers (which are not necessarily the same as calendar year numbers) 4559 4560 4561Release code95i-data95m - 1995-12-21 12:46:47 -0500 4562 4563 The latest revisions from Paul Eggert are included, the usno1995 4564 file has been updated, and a new file ("WWW") covering useful URLs 4565 has been added. 4566 4567 4568Release code95h-data95l - 1995-12-19 18:10:12 -0500 4569 4570 A simplification of a macro definition, a change to data for Sudan, 4571 and (for last minute shoppers) notes in the "Music" file on the CD 4572 "Old Man Time". 4573 4574 4575Release code95g-data95k - 1995-10-30 10:32:47 -0500 4576 4577 (slightly reformatted) 8-bit-clean proposed patch 4578 4579 minor patch: US/Eastern -> America/New_York 4580 4581 snapshot of the USNO's latest data ("usno1995") 4582 4583 some other minor cleanups 4584 4585 4586Release code95f-data95j - 1995-10-28 21:01:34 -0000 4587 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 4588 4589 European cleanups 4590 4591 support for 64-bit time_t's 4592 4593 optimization in localtime.c 4594 4595 4596Release code95e - 1995-10-13 13:23:57 -0400 4597 4598 the mktime change to scan from future to past when trying to find time zone 4599 offsets 4600 4601 4602Release data95i - 1995-09-26 10:43:26 -0400 4603 4604 For Canada/Central, guess that the Sun customer's "one week too 4605 early" was just a approximation, and the true error is one month 4606 too early. This is consistent with the rest of Canada. 4607 4608 4609Release data95h - 1995-09-21 11:26:48 -0400 4610 4611 latest changes from Paul Eggert 4612 4613 4614Release code95d - 1995-09-14 11:14:45 -0400 4615 4616 the addition of a "Music" file, which documents four recorded 4617 versions of the tune "Save That Time". 4618 4619 4620Release data95g - 1995-09-01 17:21:36 -0400 4621 4622 "yearistype" correction 4623 4624 4625Release data95f - 1995-08-28 20:46:56 -0400 4626 4627 Paul Eggert's change to the australasia file 4628 4629 4630Release data95e - 1995-07-08 18:02:34 -0400 4631 4632 The only change is a leap second at the end of this year. 4633 Thanks to Bradley White for forwarding news on the leap second. 4634 4635 4636Release data95d - 1995-07-03 13:26:22 -0400 4637 4638 Paul Eggert's changes 4639 4640 4641Release data95c - 1995-07-02 19:19:28 -0400 4642 4643 changes to "asia", "backward", "europe", and "southamerica" 4644 (read: northamericacentrics need not apply) 4645 4646 4647Release code95c - 1995-03-13 14:00:46 -0500 4648 4649 one-line fix for sign extension problems in detzcode 4650 4651 4652Release 95b - 1995-03-04 11:22:38 -0500 4653 4654 Minor changes in both: 4655 4656 The "code" file contains a workaround for the lack of "unistd.h" in 4657 Microsoft C++ version 7. 4658 4659 The "data" file contains a fixed "Link" for America/Shiprock. 4660 4661 4662Release 94h - 1994-12-10 12:51:14 -0500 4663 4664 The files: 4665 4666 * incorporate the changes to "zdump" and "date" to make changes to 4667 the "TZ" environment variable permanent; 4668 4669 * incorporate the table changes by Paul Eggert; 4670 4671 * include (and document) support for universal time specifications in 4672 data files - but do not (yet) include use of this feature in the 4673 data files. 4674 4675 Think of this as "TZ Classic" - the software has been set up not to break if 4676 universal time shows up in its input, and data entries have been 4677 left as is so as not to break existing implementations. 4678 4679 4680Release data94f - 1994-08-20 12:56:09 -0400 4681 4682 (with thanks!) the latest data updates from Paul Eggert 4683 4684 4685Release data94e - 1994-06-04 13:13:53 -0400 4686 4687 [not summarized] 4688 4689 4690Release code94g - 1994-05-05 12:14:07 -0400 4691 4692 fix missing "optind.c" and a reference to it in the Makefile 4693 4694 4695Release code94f - 1994-05-05 13:00:33 -0000 4696 [tzcode94f.tar.gz is missing!] 4697 4698 changes to avoid overflow in difftime, as well as changes to cope 4699 with the 52/53 challenge in strftime 4700 4701 4702Release code94e - 1994-03-30 23:32:59 -0500 4703 4704 change for the benefit of PCTS 4705 4706 4707Release 94d - 1994-02-24 15:42:25 -0500 4708 4709 Avoid clashes with POSIX semantics for zones such as GMT+4. 4710 4711 Some other very minor housekeeping is also present. 4712 4713 4714Release code94c - 1994-02-10 08:52:40 -0500 4715 4716 Fix bug where mkdirs was broken unless you compile with 4717 -fwritable-strings (which is generally losing to do). 4718 4719 4720Release 94b - 1994-02-07 10:04:33 -0500 4721 4722 work by Paul Eggert who notes: 4723 4724 I found another book of time zone histories by E W Whitman; it's not 4725 as extensive as Shanks but has a few goodies of its own. I used it 4726 to update the tables. I also fixed some more as a result of 4727 correspondence with Adam David and Peter Ilieve, and move some stray 4728 links from 'europe' to 'backward'. I corrected some scanning errors 4729 in usno1989. 4730 4731 As far as the code goes, I fixed zic to allow years in the range 4732 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 4733 And I cleaned up the zic documentation a little bit. 4734 4735 4736Release data94a - 1994-02-03 08:58:54 -0500 4737 4738 It simply incorporates the recently announced leap second into the 4739 "leapseconds" file. 4740 4741 4742Release 93g - 1993-11-22 17:28:27 -0500 4743 4744 Paul Eggert has provided a good deal of historic information (based 4745 on Shanks), and there are some code changes to deal with the buglets 4746 that crawled out in dealing with the new information. 4747 4748 4749Release 93f - 1993-10-15 12:27:46 -0400 4750 4751 Paul Eggert's changes 4752 4753 4754Release 93e - 1993-09-05 21:21:44 -0400 4755 4756 This has updated data for Israel, England, and Kwajalein. There's 4757 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 4758 Thanks to Paul Eggert and Peter Ilieve for the changes. 4759 4760 4761Release 93d - 1993-06-17 23:34:17 -0400 4762 4763 new fix and new data on Israel 4764 4765 4766Release 93c - 1993-06-06 19:31:55 -0400 4767 4768 [not summarized] 4769 4770 4771Release 93b - 1993-02-02 14:53:58 -0500 4772 4773 updated "leapseconds" file 4774 4775 4776Release 93 - 1993-01-08 07:01:06 -0500 4777 4778 At kre's suggestion, the package has been split in two - a code piece 4779 (which also includes documentation) that's only of use to folks who 4780 want to recompile things and a data piece useful to anyone who can 4781 run "zic". 4782 4783 The new version has a few changes to the data files, a few 4784 portability changes, and an off-by-one fix (with thanks to 4785 Tom Karzes at deshaw.com for providing a description and a 4786 solution). 4787 4788 4789Release 92c - 1992-11-21 17:35:36 -0000 4790 [tz92c.tar.Z is missing!] 4791 4792 The fallout from the latest round of DST transitions. 4793 4794 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 4795 there's also a change to "zic.c" that makes it portable to more systems. 4796 4797 4798Release 92 - 1992-04-25 18:17:03 -0000 4799 [tz92.tar.Z is missing!] 4800 4801 By popular demand (well, at any rate, following a request by kre at munnari) 4802 4803 4804The 1989 update of the time zone package featured: 4805 4806 * POSIXization (including interpretation of POSIX-style TZ environment 4807 variables, provided by Guy Harris), 4808 * ANSIfication (including versions of "mktime" and "difftime"), 4809 * SVIDulation (an "altzone" variable) 4810 * MACHination (the "gtime" function) 4811 * corrections to some time zone data (including corrections to the rules 4812 for Great Britain and New Zealand) 4813 * reference data from the United States Naval Observatory for folks who 4814 want to do additional time zones 4815 * and the 1989 data for Saudi Arabia. 4816 4817 (Since this code will be treated as "part of the implementation" in some 4818 places and as "part of the application" in others, there's no good way to 4819 name functions, such as timegm, that are not part of the proposed ANSI C 4820 standard; such functions have kept their old, underscore-free names in this 4821 update.) 4822 4823 And the "dysize" function has disappeared; it was present to allow 4824 compilation of the "date" command on old BSD systems, and a version of "date" 4825 is now provided in the package. The "date" command is not created when you 4826 "make all" since it may lack options provided by the version distributed with 4827 your operating system, or may not interact with the system in the same way 4828 the native version does. 4829 4830 Since POSIX frowns on correct leap second handling, the default behavior of 4831 the "zic" command (in the absence of a "-L" option) has been changed to omit 4832 leap second information from its output files. 4833 4834 4835----- 4836Notes 4837 4838This file contains copies of the part of each release announcement 4839that talks about the changes in that release. The text has been 4840adapted and reformatted for the purposes of this file. 4841 4842Traditionally a release R consists of a pair of tarball files, 4843tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 4844code2010a, data2012c) consist of just one or the other tarball, and a 4845few (e.g., code2012c-data2012d) have tarballs with mixed version 4846numbers. Recent releases also come in an experimental format 4847consisting of a single tarball tzdb-R.tar.lz with extra data. 4848 4849Release timestamps are taken from the release's commit (for newer, 4850Git-based releases), from the newest file in the tarball (for older 4851releases, where this info is available) or from the email announcing 4852the release (if all else fails; these are marked with a time zone 4853abbreviation of -0000 and an "is missing!" comment). 4854 4855Earlier versions of the code and data were not announced on the tz 4856list and are not summarized here. 4857 4858This file is in the public domain. 4859 4860Local Variables: 4861coding: utf-8 4862End: 4863