1# @(#)northamerica 7.69 2# also includes Central America and the Caribbean 3 4# This data is by no means authoritative; if you think you know better, 5# go ahead and edit the file (and please send any changes to 6# tz@elsie.nci.nih.gov for general use in the future). 7 8# From Paul Eggert <eggert@twinsun.com> (1999-03-22): 9# A reliable and entertaining source about time zones is 10# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 11 12############################################################################### 13 14# United States 15 16# From Paul Eggert (1999-03-31): 17# Howse writes (pp 121-125) that time zones were invented by 18# Professor Charles Ferdinand Dowd (1825-1904), 19# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 20# His pamphlet ``A System of National Time for Railroads'' (1870) 21# was the result of his proposals at the Convention of Railroad Trunk Lines 22# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 23# but in 1872-05 he moved the proposed origin to Greenwich. 24# His proposal was adopted by the railroads on 1883-11-18 at 12:00, 25# and the most of the country soon followed suit. 26 27# From Paul Eggert <eggert@twinsun.com> (1995-12-19): 28# A good source for time zone historical data in the US is 29# Thomas G. Shanks, The American Atlas (5th edition), 30# San Diego: ACS Publications, Inc. (1991). 31# Make sure you have the errata sheet; the book is somewhat useless without it. 32# It is the source for the US and Puerto Rico entries below. 33 34# From Paul Eggert (2001-03-06): 35# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 36# in his whimsical essay ``An Economical Project for Diminishing the Cost 37# of Light'' published in the Journal de Paris (1784-04-26). 38# Not everyone is happy with the results: 39# 40# I don't really care how time is reckoned so long as there is some 41# agreement about it, but I object to being told that I am saving 42# daylight when my reason tells me that I am doing nothing of the kind. 43# I even object to the implication that I am wasting something 44# valuable if I stay in bed after the sun has risen. As an admirer 45# of moonlight I resent the bossy insistence of those who want to 46# reduce my time for enjoying it. At the back of the Daylight Saving 47# scheme I detect the bony, blue-fingered hand of Puritanism, eager 48# to push people into bed earlier, and get them up earlier, to make 49# them healthy, wealthy and wise in spite of themselves. 50# 51# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday 52# 53# For more about the first ten years of DST in the United States, see 54# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html"> 55# Ten years of daylight saving from the Pittsburgh standpoint 56# (Carnegie Library of Pittsburgh, 1927)</a>. 57# 58# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 59# However, DST was imposed by the Standard Time Act of 1918, which 60# was the first nationwide legal time standard, and apparently 61# time was just called "Standard Time" or "Daylight Saving Time". 62 63# From Arthur David Olson: 64# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 65# See, for example, the front page of the Saturday, 1974-10-26 66# and Sunday, 1974-10-27 editions of the Washington Post. 67 68# From Arthur David Olson: 69# Before the Uniform Time Act of 1966 took effect in 1967, observance of 70# Daylight Saving Time in the US was by local option, except during wartime. 71 72# From Arthur David Olson (2000-09-25): 73# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 74# In the introduction, Oboler spoke of "Eastern Peace Time." 75# An AltaVista search turned up 76# <a href="http://rowayton.org/rhs/hstaug45.html">: 77# "When the time is announced over the radio now, it is 'Eastern Peace 78# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 79# </a> (August 1945) by way of confirmation. 80 81# From Joseph Gallant <notquite@hotmail.com>, citing 82# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 83# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 84# to switch to London for Attlee's address, but the American people 85# never got to hear his speech live. According to one press account, 86# CBS' Bob Trout was first to announce the word of Japan's surrender, 87# but a few seconds later, NBC, ABC and Mutual also flashed the word 88# of surrender, all of whom interrupting the bells of Big Ben in 89# London which were to precede Mr. Attlee's speech. 90 91# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 92# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 93# 94# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 95# Any announcement from Asia would reach St. John's New York newsroom on a 96# wire service teletype machine, which had prescribed signals for major news. 97# Associated Press, for example, would ring five bells before spewing out 98# typed copy of an important story, and 10 bells for news "of transcendental 99# importance." 100# 101# On Aug. 14, stalling while talking steadily into the NBC networks' open 102# microphone, St. John heard five bells and waited only to hear a sixth bell, 103# before announcing confidently: "Ladies and gentlemen, World War II is over. 104# The Japanese have agreed to our surrender terms." 105# 106# He had scored a 20-second scoop on other broadcasters. 107 108# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 109Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 110Rule US 1918 1919 - Oct lastSun 2:00 0 S 111Rule US 1942 only - Feb 9 2:00 1:00 W # War 112Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 113Rule US 1945 only - Sep 30 2:00 0 S 114Rule US 1967 max - Oct lastSun 2:00 0 S 115Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 116Rule US 1974 only - Jan 6 2:00 1:00 D 117Rule US 1975 only - Feb 23 2:00 1:00 D 118Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 119Rule US 1987 max - Apr Sun>=1 2:00 1:00 D 120# <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:"> 121# H.R.177 122# </a> (introduced 1999-01-06) would change April to March in the above rule. 123 124# From Bob Devine (1988-01-28): 125# ...Alaska (and Hawaii) had the timezone names changed in 1967. 126# old new 127# Pacific Standard Time(PST) -same- 128# Yukon Standard Time(YST) -same- 129# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 130# Nome Standard Time (NT) Bering Standard Time (BST) 131# 132# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 133# The YST zone now covers nearly all of the state, AHST just part 134# of the Aleutian islands. No DST. 135 136# From Paul Eggert (1995-12-19): 137# The tables below use `NST', not `NT', for Nome Standard Time. 138# I invented `CAWT' for Central Alaska War Time. 139 140# From U. S. Naval Observatory (1989-01-19): 141# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 142# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 143# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 144# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 145# USA MOUNTAIN 7 H BEHIND UTC DENVER 146# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 147# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 148# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 149# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 150# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 151# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 152# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 153# USA HAWAII 10 H BEHIND UTC 154# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 155 156# From Arthur David Olson (1989-01-21): 157# The above dates are for 1988. 158# Note the "AKST" and "AKDT" abbreviations, the claim that there's 159# no DST in Samoa, and the claim that there is DST in Alaska and the 160# Aleutians. 161 162# From Arthur David Olson (1988-02-13): 163# Legal standard time zone names, from United States Code (1982 Edition and 164# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 165# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 166# took effect), as explained in sections 263 and 261: 167# (none) 168# United States standard eastern time 169# United States standard mountain time 170# United States standard central time 171# United States standard Pacific time 172# (none) 173# United States standard Alaska time 174# (none) 175# Next, names from 1967-04-01 until 1983-11-30 (the date for 176# public law 98-181): 177# Atlantic standard time 178# eastern standard time 179# central standard time 180# mountain standard time 181# Pacific standard time 182# Yukon standard time 183# Alaska-Hawaii standard time 184# Bering standard time 185# And after 1983-11-30: 186# Atlantic standard time 187# eastern standard time 188# central standard time 189# mountain standard time 190# Pacific standard time 191# Alaska standard time 192# Hawaii-Aleutian standard time 193# Samoa standard time 194# The law doesn't give abbreviations. 195# 196# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 197# Public law 106-564 (2000-12-23) introduced the abbreviation 198# "Chamorro Standard Time" for time in Guam and the Northern Marianas. 199# See the file "australasia". 200 201 202# US eastern time, represented by New York 203 204# Connecticut, Delaware, District of Columbia, most of Florida, 205# Georgia, southeast Indiana (Clark, Dearborn, Floyd, Harrison, and 206# Ohio counties), eastern Kentucky, Maine, Maryland, Massachusetts, 207# New Hampshire, New Jersey, New York, North Carolina, Ohio, 208# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 209# Vermont, Virginia, West Virginia 210 211# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 212Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 213Rule NYC 1920 only - Oct lastSun 2:00 0 S 214Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 215Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 216Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 217# Zone NAME GMTOFF RULES FORMAT [UNTIL] 218Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 219 -5:00 US E%sT 1920 220 -5:00 NYC E%sT 1942 221 -5:00 US E%sT 1946 222 -5:00 NYC E%sT 1967 223 -5:00 US E%sT 224 225# US central time, represented by Chicago 226 227# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 228# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 229# Washington counties), Illinois, western Indiana 230# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 231# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 232# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 233# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 234# western Tennessee, most of Texas, Wisconsin 235 236# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 237Rule Chicago 1920 only - Jun 13 2:00 1:00 D 238Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 239Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 240Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 241Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 242Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 243# Zone NAME GMTOFF RULES FORMAT [UNTIL] 244Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 245 -6:00 US C%sT 1920 246 -6:00 Chicago C%sT 1936 Mar 1 2:00 247 -5:00 - EST 1936 Nov 15 2:00 248 -6:00 Chicago C%sT 1942 249 -6:00 US C%sT 1946 250 -6:00 Chicago C%sT 1967 251 -6:00 US C%sT 252# Oliver County, ND switched from mountain to central time on 1992-10-25. 253Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:00 254 -7:00 US M%sT 1992 Oct 25 02:00 255 -6:00 US C%sT 256 257# US mountain time, represented by Denver 258# 259# Colorado, far western Kansas, Montana, western 260# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 261# New Mexico, southwestern North Dakota, far eastern Oregon, 262# western South Dakota, far western Texas (El Paso County, Hudspeth County, 263# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 264# 265# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 266Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 267Rule Denver 1920 only - Oct lastSun 2:00 0 S 268Rule Denver 1921 only - May 22 2:00 0 S 269Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 270Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 271# Zone NAME GMTOFF RULES FORMAT [UNTIL] 272Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 273 -7:00 US M%sT 1920 274 -7:00 Denver M%sT 1942 275 -7:00 US M%sT 1946 276 -7:00 Denver M%sT 1967 277 -7:00 US M%sT 278 279# US Pacific time, represented by Los Angeles 280# 281# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 282# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties), 283# most of Nevada, most of Oregon, and Washington 284# 285# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 286Rule CA 1948 only - Mar 14 2:00 1:00 D 287Rule CA 1949 only - Jan 1 2:00 0 S 288Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 289Rule CA 1950 1961 - Sep lastSun 2:00 0 S 290Rule CA 1962 1966 - Oct lastSun 2:00 0 S 291# Zone NAME GMTOFF RULES FORMAT [UNTIL] 292Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 293 -8:00 US P%sT 1946 294 -8:00 CA P%sT 1967 295 -8:00 US P%sT 296 297# Alaska 298# AK%sT is the modern abbreviation for -9:00 per USNO. 299# 300# From Paul Eggert (2001-05-30): 301# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 302# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 303# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 304# also a Friday. Include only the time zone part of this transition, 305# ignoring the switch from Julian to Gregorian, since we can't represent 306# the Julian calendar. 307# 308# As far as we know, none of the exact locations mentioned below were 309# permanently inhabited in 1867 by anyone using either calendar. 310# (Yakutat was colonized by the Russians in 1799, but the settlement 311# was destroyed in 1805 by a Yakutat-kon war party.) However, there 312# were nearby inhabitants in some cases and for our purposes perhaps 313# it's best to simply use the official transition. 314# 315# Zone NAME GMTOFF RULES FORMAT [UNTIL] 316Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 317 -8:57:41 - LMT 1900 Aug 20 12:00 318 -8:00 - PST 1942 319 -8:00 US P%sT 1946 320 -8:00 - PST 1969 321 -8:00 US P%sT 1983 Oct 30 2:00 322 -9:00 US Y%sT 1983 Nov 30 323 -9:00 US AK%sT 324Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 325 -9:18:55 - LMT 1900 Aug 20 12:00 326 -9:00 - YST 1942 327 -9:00 US Y%sT 1946 328 -9:00 - YST 1969 329 -9:00 US Y%sT 1983 Nov 30 330 -9:00 US AK%sT 331Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 332 -9:59:36 - LMT 1900 Aug 20 12:00 333 -10:00 - CAT 1942 334 -10:00 US CAT/CAWT 1946 335 -10:00 - CAT 1967 Apr 336 -10:00 - AHST 1969 337 -10:00 US AH%sT 1983 Oct 30 2:00 338 -9:00 US Y%sT 1983 Nov 30 339 -9:00 US AK%sT 340Zone America/Nome 12:58:21 - LMT 1867 Oct 18 341 -11:01:38 - LMT 1900 Aug 20 12:00 342 -11:00 - NST 1942 343 -11:00 US N%sT 1946 344 -11:00 - NST 1967 Apr 345 -11:00 - BST 1969 346 -11:00 US B%sT 1983 Oct 30 2:00 347 -9:00 US Y%sT 1983 Nov 30 348 -9:00 US AK%sT 349Zone America/Adak 12:13:21 - LMT 1867 Oct 18 350 -11:46:38 - LMT 1900 Aug 20 12:00 351 -11:00 - NST 1942 352 -11:00 US N%sT 1946 353 -11:00 - NST 1967 Apr 354 -11:00 - BST 1969 355 -11:00 US B%sT 1983 Oct 30 2:00 356 -10:00 US AH%sT 1983 Nov 30 357 -10:00 US HA%sT 358# Shanks writes that part of southwest Alaska (e.g. Aniak) 359# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 360# and another part (e.g. Akiak) made the same switch five weeks later. 361# These switches don't quite make our 1970 cutoff. 362 363# Hawaii 364# 365# From Arthur David Olson: 366# And then there's Hawaii. 367# DST was observed for one day in 1933; 368# standard time was changed by half an hour in 1947; 369# it's always standard as of 1986. 370# 371# From Paul Eggert: 372# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 373# 374Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 375 -10:30 - HST 1933 Apr 30 2:00 376 -10:30 1:00 HDT 1933 May 21 2:00 377 -10:30 US H%sT 1947 Jun 8 2:00 378 -10:00 - HST 379 380# Now we turn to US areas that have diverged from the consensus since 1970. 381 382# Arizona mostly uses MST. 383 384# From Paul Eggert (2002-10-20): 385# 386# The information in the rest of this paragraph is derived from the 387# <a href="http://www.dlapr.lib.az.us/links/daylight.htm"> 388# Daylight Saving Time web page (2002-01-23)</a> maintained by the 389# Arizona State Library, Archives and Public Records. 390# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 391# time, but by federal law railroads, airlines, bus lines, military 392# personnel, and some engaged in interstate commerce continued to 393# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 394# Gazette says that was the date the law changed, and that 04-01 was 395# the date the state's clocks would change. In 1945 the State of 396# Arizona used standard time all year, again with exceptions only as 397# mandated by federal law. Arizona observed DST in 1967, but Arizona 398# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 399# 400# Shanks says the 1944 experiment came to an end on 1944-03-17. 401# Go with the Arizona State Library instead. 402 403Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 404 -7:00 US M%sT 1944 Jan 1 00:01 405 -7:00 - MST 1944 Apr 1 00:01 406 -7:00 US M%sT 1944 Oct 1 00:01 407 -7:00 - MST 1967 408 -7:00 US M%sT 1968 Mar 21 409 -7:00 - MST 410# From Arthur David Olson (1988-02-13): 411# A writer from the Inter Tribal Council of Arizona, Inc., 412# notes in private correspondence dated 1987-12-28 that "Presently, only the 413# Navajo Nation participates in the Daylight Saving Time policy, due to its 414# large size and location in three states." (The "only" means that other 415# tribal nations don't use DST.) 416 417Link America/Denver America/Shiprock 418 419# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 420# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 421# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 422# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 423# Teton, Twin Falls, Valley, Washington counties) and eastern Oregon 424# switched four weeks late in 1974. 425# 426# Zone NAME GMTOFF RULES FORMAT [UNTIL] 427Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 428 -8:00 US P%sT 1923 May 13 2:00 429 -7:00 US M%sT 1974 430 -7:00 - MST 1974 Feb 3 2:00 431 -7:00 US M%sT 432 433# Indiana 434# 435# For a map of Indiana's time zone regions, see: 436# <a href="http://www.mccsc.edu/time.html"> 437# What time is it in Indiana? 438# </a> (1999-04-06) 439# 440# From Paul Eggert (1995-12-19): 441# Indiana generally observes either EST all year, or CST/CDT, 442# but areas near Cincinnati and Louisville use those cities' timekeeping 443# and in 1969 and 1970 the whole state observed daylight time; 444# and there are other exceptions as noted below. 445# Shanks partitions Indiana into 345 regions, each with its own time history, 446# and writes ``Even newspaper reports present contradictory information.'' 447# Fortunately, most of the complexity occurred before our cutoff date of 1970. 448# 449# Since 1970, EST-only Indiana has been like America/Indianapolis, 450# with exceptions noted below for Crawford, Starke, and Switzerland counties. 451# The parts of Indiana not listed below have been like America/Chicago, 452# America/Louisville, or America/New_York. 453# 454# Other than Indianapolis, the Indiana place names are so nondescript 455# that they would be ambiguous if we left them at the `America' level. 456# So we reluctantly put them all in a subdirectory `America/Indiana'. 457# 458# Most of EST-only Indiana last observed DST in 1970. 459 460# From Paul Eggert (2001-03-06), following a tip by Markus Kuhn: 461# Pam Belluck reported in the New York Times (2001-01-31) that the 462# Indiana Legislature is considering a bill to adopt DST statewide. 463# Her article mentioned Vevay, whose post office observes a different 464# time zone from Danner's Hardware across the street. 465 466# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 467Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 468Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 469Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 470# Zone NAME GMTOFF RULES FORMAT [UNTIL] 471Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 472 -6:00 US C%sT 1920 473 -6:00 Indianapolis C%sT 1942 474 -6:00 US C%sT 1946 475 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 476 -5:00 - EST 1957 Sep 29 2:00 477 -6:00 - CST 1958 Apr 27 2:00 478 -5:00 - EST 1969 479 -5:00 US E%sT 1971 480 -5:00 - EST 481Link America/Indianapolis America/Indiana/Indianapolis 482# 483# Part of Crawford County, Indiana, last observed DST in 1975, 484# and left its clocks alone in 1974. 485# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 486Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 487Rule Marengo 1951 only - Sep lastSun 2:00 0 S 488Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 489Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 490# Zone NAME GMTOFF RULES FORMAT [UNTIL] 491Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 492 -6:00 US C%sT 1951 493 -6:00 Marengo C%sT 1961 Apr 30 2:00 494 -5:00 - EST 1969 495 -5:00 US E%sT 1974 Jan 6 2:00 496 -6:00 1:00 CDT 1974 Oct 27 2:00 497 -5:00 US E%sT 1976 498 -5:00 - EST 499# 500# Starke County, Indiana 501# From Arthur David Olson (1991-10-28): 502# An article on page A3 of the Sunday, 1991-10-27 Washington Post 503# notes that Starke County switched from Central time to Eastern time as of 504# 1991-10-27. 505# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 506Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 507Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 508Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 509Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 510Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 511# Zone NAME GMTOFF RULES FORMAT [UNTIL] 512Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 513 -6:00 US C%sT 1947 514 -6:00 Starke C%sT 1962 Apr 29 2:00 515 -5:00 - EST 1963 Oct 27 2:00 516 -6:00 US C%sT 1991 Oct 27 2:00 517 -5:00 - EST 518# 519# Switzerland County, Indiana, last observed DST in 1972. 520# Zone NAME GMTOFF RULES FORMAT [UNTIL] 521Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 522 -6:00 US C%sT 1954 Apr 25 2:00 523 -5:00 - EST 1969 524 -5:00 US E%sT 1973 525 -5:00 - EST 526 527# Part of Kentucky left its clocks alone in 1974. 528# This also includes a part of Indiana immediately adjacent to Louisville. 529# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 530Rule Louisville 1921 only - May 1 2:00 1:00 D 531Rule Louisville 1921 only - Sep 1 2:00 0 S 532Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 533Rule Louisville 1941 only - Sep lastSun 2:00 0 S 534Rule Louisville 1946 only - Jun 2 2:00 0 S 535Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 536Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 537# Zone NAME GMTOFF RULES FORMAT [UNTIL] 538Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 539 -6:00 US C%sT 1921 540 -6:00 Louisville C%sT 1942 541 -6:00 US C%sT 1946 542 -6:00 Louisville C%sT 1961 Jul 23 2:00 543 -5:00 - EST 1968 544 -5:00 US E%sT 1974 Jan 6 2:00 545 -6:00 1:00 CDT 1974 Oct 27 2:00 546 -5:00 US E%sT 547Link America/Louisville America/Kentucky/Louisville 548# 549# Wayne, Clinton, and Russell Counties, Kentucky 550# 551# From 552# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 553# Lake Cumberland LIFE 554# </a> (1999-01-29) via WKYM-101.7: 555# Clinton County has joined Wayne County in asking the DoT to change from 556# the Central to the Eastern time zone.... The Wayne County government made 557# the same request in December. And while Russell County officials have not 558# taken action, the majority of respondents to a poll conducted there in 559# August indicated they would like to change to "fast time" also. 560# The three Lake Cumberland counties are the farthest east of any U.S. 561# location in the Central time zone. 562# 563# From Rich Wales (2000-08-29): 564# After prolonged debate, and despite continuing deep differences of opinion, 565# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 566# (-0500) time. They won't "fall back" this year. See Sara Shipley, 567# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 568# 569# From Paul Eggert (2001-07-16): 570# The final rule was published in the 571# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> 572# Federal Register 65, 160 (2000-08-17), page 50154-50158. 573# </a> 574# 575Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:00 576 -6:00 US C%sT 1946 577 -6:00 - CST 1968 578 -6:00 US C%sT 2000 Oct 29 2:00 579 -5:00 US E%sT 580 581 582# From Rives McDow (2000-08-30): 583# Here ... are all the changes in the US since 1985. 584# Kearny County, KS (put all of county on central; 585# previously split between MST and CST) ... 1990-10 586# Starke County, IN (from CST to EST) ... 1991-10 587# Oliver County, ND (from MST to CST) ... 1992-10 588# West Wendover, NV (from PST TO MST) ... 1999-10 589# Wayne County, KY (from CST to EST) ... 2000-10 590# 591# From Paul Eggert (2001-07-17): 592# We don't know where the line used to be within Kearny County, KS, 593# so omit that change for now. 594# See America/Indiana/Knox for the Starke County, IN change. 595# See America/North_Dakota/Center for the Oliver County, ND change. 596# West Wendover, NV officially switched from Pacific to mountain time on 597# 1999-10-31. See the 598# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> 599# Federal Register 64, 203 (1999-10-21), page 56705-56707. 600# </a> 601# However, the Federal Register says that West Wendover already operated 602# on mountain time, and the rule merely made this official; 603# hence a separate tz entry is not needed. 604 605# Michigan 606# 607# From Bob Devine (1988-01-28): 608# Michigan didn't observe DST from 1968 to 1973. 609# 610# From Paul Eggert (1999-03-31): 611# Shanks writes that Michigan started using standard time on 1885-09-18, 612# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 613# that Detroit kept 614# 615# local time until 1900 when the City Council decreed that clocks should 616# be put back twenty-eight minutes to Central Standard Time. Half the 617# city obeyed, half refused. After considerable debate, the decision 618# was rescinded and the city reverted to Sun time. A derisive offer to 619# erect a sundial in front of the city hall was referred to the 620# Committee on Sewers. Then, in 1905, Central time was adopted 621# by city vote. 622# 623# This story is too entertaining to be false, so go with Howse over Shanks. 624# 625# From Paul Eggert (2001-03-06): 626# Garland (1927) writes ``Cleveland and Detroit advanced their clocks 627# one hour in 1914.'' This change is not in Shanks. We have no more 628# info, so omit this for now. 629# 630# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 631# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 632Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 633Rule Detroit 1948 only - Sep lastSun 2:00 0 S 634Rule Detroit 1967 only - Jun 14 2:00 1:00 D 635Rule Detroit 1967 only - Oct lastSun 2:00 0 S 636# Zone NAME GMTOFF RULES FORMAT [UNTIL] 637Zone America/Detroit -5:32:11 - LMT 1905 638 -6:00 - CST 1915 May 15 2:00 639 -5:00 - EST 1942 640 -5:00 US E%sT 1946 641 -5:00 Detroit E%sT 1973 642 -5:00 US E%sT 1975 643 -5:00 - EST 1975 Apr 27 2:00 644 -5:00 US E%sT 645# 646# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 647# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 648Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 649Rule Menominee 1946 only - Sep lastSun 2:00 0 S 650Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 651Rule Menominee 1966 only - Oct lastSun 2:00 0 S 652# Zone NAME GMTOFF RULES FORMAT [UNTIL] 653Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 654 -6:00 US C%sT 1946 655 -6:00 Menominee C%sT 1969 Apr 27 2:00 656 -5:00 - EST 1973 Apr 29 2:00 657 -6:00 US C%sT 658 659# Navassa 660# administered by the US Fish and Wildlife Service 661# claimed by US under the provisions of the 1856 Guano Islands Act 662# also claimed by Haiti 663# occupied 1857/1900 by the Navassa Phosphate Co 664# US lighthouse 1917/1996-09 665# currently uninhabited 666# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 667# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 668# Jimmy Skaggs, _The Great Guano Rush_ (1994). 669 670# Old names, for S5 users 671 672# Link LINK-FROM LINK-TO 673Link America/New_York EST5EDT 674Link America/Chicago CST6CDT 675Link America/Denver MST7MDT 676Link America/Los_Angeles PST8PDT 677Link America/Indianapolis EST 678Link America/Phoenix MST 679Link Pacific/Honolulu HST 680 681################################################################################ 682 683 684# From Paul Eggert <eggert@twinsun.com> (1999-10-29): 685# A good source for time zone historical data outside the US is 686# Thomas G. Shanks, The International Atlas (5th edition), 687# San Diego: ACS Publications, Inc. (1999). 688# 689# Gwillim Law writes that a good source 690# for recent time zone data is the International Air Transport 691# Association's Standard Schedules Information Manual (IATA SSIM), 692# published semiannually. Law sent in several helpful summaries 693# of the IATA's data after 1990. 694# 695# Except where otherwise noted, Shanks is the source for entries through 1990, 696# and IATA SSIM is the source for entries after 1990. 697# 698# Other sources occasionally used include: 699# 700# Edward W. Whitman, World Time Differences, 701# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 702# which I found in the UCLA library. 703# 704# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf"> 705# William Willett, The Waste of Daylight, 19th edition 706# </a> (1914-03) 707# 708# See the `europe' file for Greenland. 709 710# Canada 711 712# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 713# I post here the time zone abbreviations standardized in Canada 714# for both English and French in the CAN/CSA-Z234.4-89 standard.... 715# 716# UTC Standard time Daylight savings time 717# offset French English French English 718# -2:30 - - HAT NDT 719# -3 - - HAA ADT 720# -3:30 HNT NST - - 721# -4 HNA AST HAE EDT 722# -5 HNE EST HAC CDT 723# -6 HNC CST HAR MDT 724# -7 HNR MST HAP PDT 725# -8 HNP PST HAY YDT 726# -9 HNY YST - - 727# 728# HN: Heure Normale ST: Standard Time 729# HA: Heure Avanc<e'>e DT: Daylight saving Time 730# 731# A: de l'Atlantique Atlantic 732# C: du Centre Central 733# E: de l'Est Eastern 734# M: Mountain 735# N: Newfoundland 736# P: du Pacifique Pacific 737# R: des Rocheuses 738# T: de Terre-Neuve 739# Y: du Yukon Yukon 740# 741# From Paul Eggert <eggert@twinsun.com> (1994-11-22): 742# Alas, this sort of thing must be handled by localization software. 743 744# Unless otherwise specified, the data for Canada are all from Shanks. 745 746# From Paul Eggert (2000-10-02): 747# H. David Matthews and Mary Vincent's map 748# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm"> 749# "It's about TIME", _Canadian Geographic_ (September-October 1998) 750# </a> contains detailed boundaries for regions observing nonstandard 751# time and daylight saving time arrangements in Canada circa 1998. 752# 753# INMS, the Institute for National Measurement Standards in Ottawa, has 754# <a href="http://www.nrc.ca/inms/time/tze.html"> 755# information about standard and daylight saving time zones in Canada. 756# </a> (updated periodically). 757# Its unofficial information is often taken from Matthews and Vincent. 758 759# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 760Rule Canada 1918 only - Apr 14 2:00 1:00 D 761Rule Canada 1918 only - Oct 31 2:00 0 S 762Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 763Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 764Rule Canada 1945 only - Sep 30 2:00 0 S 765Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 766Rule Canada 1974 max - Oct lastSun 2:00 0 S 767Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 768 769 770# Newfoundland (and far southeast Labrador) 771 772# From Paul Eggert (2000-10-02): 773# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 774# but the only part of Labrador that follows the rules is the 775# southeast corner, including Port Hope Simpson and Mary's Harbour, 776# but excluding, say, Black Tickle. 777 778# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 779Rule StJohns 1917 only - Apr 8 2:00 1:00 D 780Rule StJohns 1917 only - Sep 17 2:00 0 S 781# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 782Rule StJohns 1919 only - May 5 23:00 1:00 D 783Rule StJohns 1919 only - Aug 12 23:00 0 S 784# For 1931-1935 Whitman gives Apr same date; go with Shanks. 785Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 786Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 787# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks. 788Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 789Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 790# Whitman gives the following transitions: 791# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 792# but go with Shanks and assume they used Canadian rules. 793# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 794# Apr 30 - Sep 24; go with Shanks. 795Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 796Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 797Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 798Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 799Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 800# From Paul Eggert (2000-10-02): 801# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 802# at 00:01 local time. For now, assume it started in 1987. 803Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 804Rule StJohns 1987 max - Oct lastSun 0:01 0 S 805Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 806Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D 807# St John's has an apostrophe, but Posix file names can't have apostrophes. 808# Zone NAME GMTOFF RULES FORMAT [UNTIL] 809Zone America/St_Johns -3:30:52 - LMT 1884 810 -3:30:52 StJohns N%sT 1918 811 -3:30:52 Canada N%sT 1919 812 -3:30:52 StJohns N%sT 1935 Mar 30 813 -3:30 StJohns N%sT 1942 May 11 814 -3:30 Canada N%sT 1946 815 -3:30 StJohns N%sT 816 817# most of east Labrador 818 819# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 820# Zone NAME GMTOFF RULES FORMAT [UNTIL] 821Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 822 -3:30:52 - NST 1918 823 -3:30:52 Canada N%sT 1919 824 -3:30:52 - NST 1935 Mar 30 825 -3:30 - NST 1936 826 -3:30 StJohns N%sT 1942 May 11 827 -3:30 Canada N%sT 1946 828 -3:30 StJohns N%sT 1966 Mar 15 2:00 829 -4:00 StJohns A%sT 830 831 832# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 833 834# From Paul Eggert (1996-06-12): 835# Shanks writes that since 1970 most of this region has been like Halifax. 836# Many locales did not observe peacetime DST until 1972; 837# Glace Bay, NS is the largest that we know of. 838# Shanks also writes that Liverpool, NS was the only town in Canada to observe 839# DST in 1971 but not 1970; for now we'll assume this is a typo. 840 841# From Paul Eggert (2000-10-02): 842# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches 843# at 00:01 local time. FIXME: verify and create a new Zone for this. 844 845 846# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 847Rule Halifax 1916 only - Apr 1 0:00 1:00 D 848Rule Halifax 1916 only - Oct 1 0:00 0 S 849Rule Halifax 1920 only - May 9 0:00 1:00 D 850Rule Halifax 1920 only - Aug 29 0:00 0 S 851Rule Halifax 1921 only - May 6 0:00 1:00 D 852Rule Halifax 1921 1922 - Sep 5 0:00 0 S 853Rule Halifax 1922 only - Apr 30 0:00 1:00 D 854Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 855Rule Halifax 1923 only - Sep 4 0:00 0 S 856Rule Halifax 1924 only - Sep 15 0:00 0 S 857Rule Halifax 1925 only - Sep 28 0:00 0 S 858Rule Halifax 1926 only - May 16 0:00 1:00 D 859Rule Halifax 1926 only - Sep 13 0:00 0 S 860Rule Halifax 1927 only - May 1 0:00 1:00 D 861Rule Halifax 1927 only - Sep 26 0:00 0 S 862Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 863Rule Halifax 1928 only - Sep 9 0:00 0 S 864Rule Halifax 1929 only - Sep 3 0:00 0 S 865Rule Halifax 1930 only - Sep 15 0:00 0 S 866Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 867Rule Halifax 1932 only - May 1 0:00 1:00 D 868Rule Halifax 1933 only - Apr 30 0:00 1:00 D 869Rule Halifax 1933 only - Oct 2 0:00 0 S 870Rule Halifax 1934 only - May 20 0:00 1:00 D 871Rule Halifax 1934 only - Sep 16 0:00 0 S 872Rule Halifax 1935 only - Jun 2 0:00 1:00 D 873Rule Halifax 1935 only - Sep 30 0:00 0 S 874Rule Halifax 1936 only - Jun 1 0:00 1:00 D 875Rule Halifax 1936 only - Sep 14 0:00 0 S 876Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 877Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 878Rule Halifax 1939 only - May 28 0:00 1:00 D 879Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 880Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 881Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 882Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 883Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 884Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 885Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 886Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 887Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 888# Zone NAME GMTOFF RULES FORMAT [UNTIL] 889Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 890 -4:00 Halifax A%sT 1918 891 -4:00 Canada A%sT 1919 892 -4:00 Halifax A%sT 1942 Feb 9 2:00s 893 -4:00 Canada A%sT 1946 894 -4:00 Halifax A%sT 1974 895 -4:00 Canada A%sT 896Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 897 -4:00 Canada A%sT 1953 898 -4:00 Halifax A%sT 1954 899 -4:00 - AST 1972 900 -4:00 Halifax A%sT 1974 901 -4:00 Canada A%sT 902 903 904# Ontario, Quebec 905 906# From Paul Eggert (1996-06-12): 907# Shanks writes that since 1970 most of Ontario has been like Toronto, 908# and most of Quebec has been like Montreal. 909# Thunder Bay skipped DST in 1973. 910# Many smaller locales did not observe peacetime DST until 1974; 911# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 912# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 913 914# From Mark Brader (2003-07-26): 915# [According to the Toronto Star] Orillia, Ontario, adopted DST 916# effective Saturday, 1912-06-22, 22:00; the article mentions that 917# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 918# have already done so. In Orillia DST was to run until Saturday, 919# 1912-08-31 (no time mentioned), but it was met with considerable 920# hostility from certain segments of the public, and was revoked after 921# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but 922# presumably that should be -07-06. (1912-06-19, -07-12; also letters 923# earlier in June). 924# 925# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 926 927# From Paul Eggert (1997-10-17): 928# Mark Brader writes that an article in the 1997-10-14 Toronto Star 929# says that Atikokan, Ontario currently does not observe DST, 930# but will vote on 11-10 whether to use EST/EDT. 931# He also writes that the 932# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 933# Ontario Time Act (1990, Chapter T.9) 934# </a> 935# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 936# Officially Atikokan is therefore on CST/CDT, and most likely this report 937# concerns a non-official time observed as a matter of local practice. 938# For what it's worth, Shanks says that Atikokan has agreed with 939# Rainy River ever since standard time was introduced. 940 941# From Paul Eggert (2000-10-02): 942# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 943# New Osnaburgh observe CST all year, that Big Trout Lake observes 944# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 945# violation of the official Ontario rules. 946# They also write that Quebec east of the -63 meridian is supposed to 947# observe AST, but residents as far east as Natashquan use EST/EDT, 948# and residents east of Natashquan use AST. 949# We probably need Zones for far east Quebec and for Atikokan, 950# but we don't know when their practices started. 951 952# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 953Rule Mont 1917 only - Mar 25 2:00 1:00 D 954Rule Mont 1917 only - Apr 24 0:00 0 S 955Rule Mont 1919 only - Mar 31 2:30 1:00 D 956Rule Mont 1919 only - Oct 25 2:30 0 S 957Rule Mont 1920 only - May 2 2:30 1:00 D 958Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S 959Rule Mont 1921 only - May 1 2:00 1:00 D 960Rule Mont 1922 only - Apr 30 2:00 1:00 D 961Rule Mont 1924 only - May 17 2:00 1:00 D 962Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 963Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 964# The 1927-to-1937 rules can be expressed more simply as 965# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D 966# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S 967# The rules below avoid use of 24:00 968# (which pre-1998 versions of zic cannot handle). 969Rule Mont 1927 only - May 1 0:00 1:00 D 970Rule Mont 1927 1932 - Sep lastSun 0:00 0 S 971Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D 972Rule Mont 1932 only - May 1 0:00 1:00 D 973Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D 974Rule Mont 1933 only - Oct 1 0:00 0 S 975Rule Mont 1934 1939 - Sep lastSun 0:00 0 S 976Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D 977Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 978Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 979Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 980Rule Mont 1957 1973 - Oct lastSun 2:00 0 S 981 982Rule Toronto 1919 only - Mar 30 23:30 1:00 D 983Rule Toronto 1919 only - Oct 26 0:00 0 S 984Rule Toronto 1920 only - May 2 2:00 1:00 D 985Rule Toronto 1920 only - Sep 26 0:00 0 S 986Rule Toronto 1921 only - May 15 2:00 1:00 D 987Rule Toronto 1921 only - Sep 15 2:00 0 S 988Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 989# Shanks says 1923-09-19; assume it's a typo and that "-16" was meant. 990Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 991Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 992# The 1927-to-1939 rules can be expressed more simply as 993# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 994# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 995# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 996# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 997# The rules below avoid use of Sun>=25 998# (which pre-2004 versions of zic cannot handle). 999Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1000Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1001Rule Toronto 1932 only - May 1 2:00 1:00 D 1002Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1003Rule Toronto 1933 only - Oct 1 2:00 0 S 1004Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1005Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1006Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1007Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1008Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1009Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1010Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1011Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1012Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1013# Shanks says Toronto ended DST a week early in 1971, namely on 1971-10-24, 1014# but Mark Brader wrote (2003-05-31) that he checked the 1971-10-30 issue 1015# of the Toronto Star, and it said that DST ended 1971-10-31 as usual. 1016Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1017 1018# From Paul Eggert (2003-07-27): 1019# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1020# Port Arthur, Ontario, the principle of the Bill has been in 1021# operation for the past three years, and in the City of Moose Jaw, 1022# Saskatchewan, for one year." 1023 1024# From David Bryan via Tory Tronrud, Director/Curator, 1025# Thunder Bay Museum (2003-11-12): 1026# There is some suggestion, however, that, by-law or not, daylight 1027# savings time was being practiced in Fort William and Port Arthur 1028# before 1909.... [I]n 1910, the line between the Eastern and Central 1029# Time Zones was permanently moved about two hundred miles west to 1030# include the Thunder Bay area.... When Canada adopted daylight 1031# savings time in 1916, Fort William and Port Arthur, having done so 1032# already, did not change their clocks.... During the Second World 1033# War,... [t]he cities agreed to implement DST during the summer 1034# months for the remainder of the war years. 1035 1036# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1037Zone America/Montreal -4:54:16 - LMT 1884 1038 -5:00 Mont E%sT 1918 1039 -5:00 Canada E%sT 1919 1040 -5:00 Mont E%sT 1942 Feb 9 2:00s 1041 -5:00 Canada E%sT 1946 1042 -5:00 Mont E%sT 1974 1043 -5:00 Canada E%sT 1044Zone America/Toronto -5:17:32 - LMT 1895 1045 -5:00 Canada E%sT 1919 1046 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1047 -5:00 Canada E%sT 1946 1048 -5:00 Toronto E%sT 1974 1049 -5:00 Canada E%sT 1050Zone America/Thunder_Bay -5:57:00 - LMT 1895 1051 -6:00 - CST 1910 1052 -5:00 - EST 1942 1053 -5:00 Canada E%sT 1970 1054 -5:00 Mont E%sT 1973 1055 -5:00 - EST 1974 1056 -5:00 Canada E%sT 1057Zone America/Nipigon -5:53:04 - LMT 1895 1058 -5:00 Canada E%sT 1940 Sep 29 1059 -5:00 1:00 EDT 1942 Feb 9 2:00s 1060 -5:00 Canada E%sT 1061Zone America/Rainy_River -6:17:56 - LMT 1895 1062 -6:00 Canada C%sT 1940 Sep 29 1063 -6:00 1:00 CDT 1942 Feb 9 2:00s 1064 -6:00 Canada C%sT 1065 1066 1067# Manitoba 1068 1069# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1070Rule Winn 1916 only - Apr 23 0:00 1:00 D 1071Rule Winn 1916 only - Sep 17 0:00 0 S 1072Rule Winn 1918 only - Apr 14 2:00 1:00 D 1073Rule Winn 1918 only - Oct 31 2:00 0 S 1074Rule Winn 1937 only - May 16 2:00 1:00 D 1075Rule Winn 1937 only - Sep 26 2:00 0 S 1076Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1077Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1078Rule Winn 1945 only - Sep lastSun 2:00 0 S 1079Rule Winn 1946 only - May 12 2:00 1:00 D 1080Rule Winn 1946 only - Oct 13 2:00 0 S 1081Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1082Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1083Rule Winn 1950 only - May 1 2:00 1:00 D 1084Rule Winn 1950 only - Sep 30 2:00 0 S 1085Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1086Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1087Rule Winn 1959 only - Oct lastSun 2:00 0 S 1088Rule Winn 1960 only - Sep lastSun 2:00 0 S 1089Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1090Rule Winn 1963 only - Sep 22 2:00 0 S 1091Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 1092Rule Winn 1966 1986 - Oct lastSun 2:00 0 S 1093Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 1094# From Paul Eggert (2000-10-02): 1095# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from 1096# DST at 03:00 local time. For now, assume it started in 1987. 1097Rule Winn 1987 max - Oct lastSun 2:00s 0 S 1098# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1099Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1100 -6:00 Winn C%sT 1101 1102 1103# Saskatchewan 1104 1105# From Mark Brader (2003-07-26): 1106# The first actual adoption of DST in Canada was at the municipal 1107# level. As the [Toronto] Star put it (1912-06-07), "While people 1108# elsewhere have long been talking of legislation to save daylight, 1109# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1110# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1111# presumably late evening, as below), and would run until "the end of 1112# the summer". The discrepancy between municipal time and railroad 1113# time was noted. 1114 1115# From Paul Eggert (2003-07-27): 1116# Willett (1914-03) notes that DST "has been in operation ... in the 1117# City of Moose Jaw, Saskatchewan, for one year." 1118 1119# From Paul Eggert (2000-10-02): 1120# Shanks writes that since 1970 most of this region has been like Regina. 1121# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1122# Other western towns (e.g. Lloydminster) are like Edmonton. 1123# Matthews and Vincent (1998) write that Denare Beach and Creighton 1124# are like Winnipeg, in violation of Saskatchewan law. 1125 1126# From W. Jones <jones@skdad.usask.ca> (1992-11-06): 1127# The. . .below is based on information I got from our law library, the 1128# provincial archives, and the provincial Community Services department. 1129# A precise history would require digging through newspaper archives, and 1130# since you didn't say what you wanted, I didn't bother. 1131# 1132# Saskatchewan is split by a time zone meridian (105W) and over the years 1133# the boundary became pretty ragged as communities near it reevaluated 1134# their affiliations in one direction or the other. In 1965 a provincial 1135# referendum favoured legislating common time practices. 1136# 1137# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1138# Saskatchewan 1978) was proclaimed, and established that the eastern 1139# part of Saskatchewan would use CST year round, that districts in 1140# northwest Saskatchewan would by default follow CST but could opt to 1141# follow Mountain Time rules (thus 1 hour difference in the winter and 1142# zero in the summer), and that districts in southwest Saskatchewan would 1143# by default follow MT but could opt to follow CST. 1144# 1145# It took a few years for the dust to settle (I know one story of a town 1146# on one time zone having its school in another, such that a mom had to 1147# serve her family lunch in two shifts), but presently it seems that only 1148# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1149# rules any more; all other districts appear to have used CST year round 1150# since sometime in the 1960s. 1151 1152# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1153Rule Regina 1918 only - Apr 14 2:00 1:00 D 1154Rule Regina 1918 only - Oct 31 2:00 0 S 1155Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1156Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1157Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1158Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1159Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1160Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1161Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1162Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1163Rule Regina 1945 only - Sep lastSun 2:00 0 S 1164Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1165Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1166Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1167Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1168Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1169Rule Regina 1959 only - Oct lastSun 2:00 0 S 1170# 1171Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1172Rule Swift 1957 only - Oct lastSun 2:00 0 S 1173Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1174Rule Swift 1959 only - Oct lastSun 2:00 0 S 1175Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1176# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1177Zone America/Regina -6:58:36 - LMT 1905 Sep 1178 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1179 -6:00 - CST 1180Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1181 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1182 -7:00 Regina M%sT 1950 1183 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1184 -6:00 - CST 1185 1186 1187# Alberta 1188 1189# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1190Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1191Rule Edm 1918 only - Oct 31 2:00 0 S 1192Rule Edm 1919 only - May 27 2:00 0 S 1193Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1194Rule Edm 1920 only - Oct lastSun 2:00 0 S 1195Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1196Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1197Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1198Rule Edm 1945 only - Sep lastSun 2:00 0 S 1199Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1200Rule Edm 1947 only - Sep lastSun 2:00 0 S 1201Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1202Rule Edm 1967 only - Oct lastSun 2:00 0 S 1203Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1204Rule Edm 1969 only - Oct lastSun 2:00 0 S 1205Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1206Rule Edm 1972 max - Oct lastSun 2:00 0 S 1207Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 1208# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1209Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1210 -7:00 Edm M%sT 1211 1212 1213# British Columbia 1214 1215# From Paul Eggert (2000-10-02): 1216# Shanks writes that since 1970 most of this region has been like Vancouver. 1217# Dawson Creek uses MST. Much of east BC is like Edmonton. 1218# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1219 1220# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1221Rule Vanc 1918 only - Apr 14 2:00 1:00 D 1222Rule Vanc 1918 only - Oct 31 2:00 0 S 1223Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 1224Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 1225Rule Vanc 1945 only - Sep 30 2:00 0 S 1226Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 1227Rule Vanc 1946 only - Oct 13 2:00 0 S 1228Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 1229Rule Vanc 1962 max - Oct lastSun 2:00 0 S 1230Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 1231# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1232Zone America/Vancouver -8:12:28 - LMT 1884 1233 -8:00 Vanc P%sT 1234Zone America/Dawson_Creek -8:00:56 - LMT 1884 1235 -8:00 Canada P%sT 1947 1236 -8:00 Vanc P%sT 1972 Aug 30 2:00 1237 -7:00 - MST 1238 1239 1240# Northwest Territories, Nunavut, Yukon 1241 1242# From Paul Eggert (1999-10-29): 1243# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 1244# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs: 1245# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 1246# c. 7 defines Yukon standard time as UTC-9. This is still valid; 1247# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 1248# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 1249# * O.I.C. 1980/02 established DST. 1250# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 1251# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 1252 1253# From Rives McDow (1999-09-04): 1254# Nunavut ... moved ... to incorporate the whole territory into one time zone. 1255# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 1256# Nunavut moves to single time zone Oct. 31 1257# </a> 1258# 1259# From Antoine Leca (1999-09-06): 1260# We then need to create a new timezone for the Kitikmeot region of Nunavut 1261# to differentiate it from the Yellowknife region. 1262 1263# From Paul Eggert (1999-09-20): 1264# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 1265# Basic Facts: The New Territory 1266# </a> (1999) reports that Pangnirtung operates on eastern time, 1267# and that Coral Harbour does not observe DST. We don't know when 1268# Pangnirtung switched to eastern time; we'll guess 1995. 1269# We'll ignore the claim about Coral Harbour for now, 1270# since we have no further info. 1271 1272# From Rives McDow (1999-11-08): 1273# On October 31, when the rest of Nunavut went to Central time, 1274# Pangnirtung wobbled. Here is the result of their wobble: 1275# 1276# The following businesses and organizations in Pangnirtung use Central Time: 1277# 1278# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 1279# Eastern Arctic National Parks, A & D Specialist 1280# 1281# The following businesses and organizations in Pangnirtung use Eastern Time: 1282# 1283# Hamlet office, All other businesses, Both schools, Airport operator 1284# 1285# This has made for an interesting situation there, which warranted the news. 1286# No one there that I spoke with seems concerned, or has plans to 1287# change the local methods of keeping time, as it evidently does not 1288# really interfere with any activities or make things difficult locally. 1289# They plan to celebrate New Year's turn-over twice, one hour apart, 1290# so it appears that the situation will last at least that long. 1291# The Nunavut Intergovernmental Affairs hopes that they will "come to 1292# their senses", but the locals evidently don't see any problem with 1293# the current state of affairs. 1294 1295# From Michaela Rodrigue, writing in the 1296# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 1297# Nunatsiaq News (1999-11-19)</a>: 1298# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 1299# central - or Nunavut time - for government offices, and eastern time 1300# for municipal offices and schools.... Igloolik [was similar but then] 1301# made the switch to central time on Saturday, Nov. 6. 1302 1303# From Paul Eggert (2000-10-02): 1304# Matthews and Vincent (1998) say the following, but we lack histories 1305# for these potential new Zones. 1306# 1307# The Canadian Forces station at Alert uses Eastern Time while the 1308# handful of residents at the Eureka weather station [in the Central 1309# zone] skip daylight savings. Baffin Island, which is crossed by the 1310# Central, Eastern and Atlantic Time zones only uses Eastern Time. 1311# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 1312# Central Time and Southampton Island [in the Central zone] is not 1313# required to use daylight savings. 1314 1315# From 1316# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> 1317# Nunavut now has two time zones 1318# </a> (2000-11-10): 1319# The Nunavut government would allow its employees in Kugluktuk and 1320# Cambridge Bay to operate on central time year-round, putting them 1321# one hour behind the rest of Nunavut for six months during the winter. 1322# At the end of October the two communities had rebelled against 1323# Nunavut's unified time zone, refusing to shift to eastern time with 1324# the rest of the territory for the winter. Cambridge Bay remained on 1325# central time, while Kugluktuk, even farther west, reverted to 1326# mountain time, which they had used before the advent of Nunavut's 1327# unified time zone in 1999. 1328# 1329# From Rives McDow (2001-01-20), quoting the Nunavut government: 1330# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 1331 1332# From Paul Eggert (2000-12-04): 1333# Let's just keep track of the official times for now. 1334 1335# From Rives McDow (2001-03-07): 1336# The premier of Nunavut has issued a ministerial statement advising 1337# that effective 2001-04-01, the territory of Nunavut will revert 1338# back to three time zones (mountain, central, and eastern). Of the 1339# cities in Nunavut, Coral Harbor is the only one that I know of that 1340# has said it will not observe dst, staying on EST year round. I'm 1341# checking for more info, and will get back to you if I come up with 1342# more. 1343# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 1344 1345# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1346Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 1347Rule NT_YK 1918 only - Oct 27 2:00 0 S 1348Rule NT_YK 1919 only - May 25 2:00 1:00 D 1349Rule NT_YK 1919 only - Nov 1 0:00 0 S 1350Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 1351Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 1352Rule NT_YK 1945 only - Sep 30 2:00 0 S 1353Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 1354Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 1355Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 1356Rule NT_YK 1980 max - Oct lastSun 2:00 0 S 1357Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 1358# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1359Zone America/Pangnirtung -4:22:56 - LMT 1884 1360 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 1361 -5:00 Canada E%sT 1999 Oct 31 2:00 1362 -6:00 Canada C%sT 2000 Oct 29 2:00 1363 -5:00 Canada E%sT 1364Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 1365 -5:00 NT_YK E%sT 1999 Oct 31 2:00 1366 -6:00 Canada C%sT 2000 Oct 29 2:00 1367 -5:00 Canada E%sT 1368Zone America/Rankin_Inlet -6:08:40 - LMT 1884 1369 -6:00 NT_YK C%sT 2000 Oct 29 2:00 1370 -5:00 - EST 2001 Apr 1 3:00 1371 -6:00 Canada C%sT 1372Zone America/Cambridge_Bay -7:00:20 - LMT 1884 1373 -7:00 NT_YK M%sT 1999 Oct 31 2:00 1374 -6:00 Canada C%sT 2000 Oct 29 2:00 1375 -5:00 - EST 2000 Nov 5 0:00 1376 -6:00 - CST 2001 Apr 1 3:00 1377 -7:00 Canada M%sT 1378Zone America/Yellowknife -7:37:24 - LMT 1884 1379 -7:00 NT_YK M%sT 1380Zone America/Inuvik -8:54:00 - LMT 1884 1381 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 1382 -7:00 NT_YK M%sT 1383Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 1384 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 1385 -8:00 NT_YK P%sT 1386Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 1387 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 1388 -8:00 NT_YK P%sT 1389 1390 1391############################################################################### 1392 1393# Mexico 1394 1395# From Paul Eggert (2001-03-05): 1396# The Investigation and Analysis Service of the 1397# Mexican Library of Congress (MLoC) has published a 1398# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> 1399# history of Mexican local time (in Spanish) 1400# </a>. 1401# 1402# Here are the discrepancies between Shanks and the MLoC. 1403# (In all cases we go with the MLoC.) 1404# Shanks reports that Baja was at -8:00 in 1922/1923. 1405# Shanks says the 1930 transition in Baja was 1930-11-16. 1406# Shanks reports no DST during summer 1931. 1407# Shanks reports a transition at 1032-03-30 23:00, not 1932-04-01. 1408# Shanks does not report transitions for Baja in 1945 or 1948. 1409# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23. 1410# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00 1411# on 1997-10-26 at 02:00. 1412 1413# From Gwillim Law (2001-02-20): 1414# There are some other discrepancies between the Decrees page and the 1415# tz database. I think they can best be explained by supposing that 1416# the researchers who prepared the Decrees page failed to find some of 1417# the relevant documents. 1418 1419# From Paul Eggert (2000-07-26): 1420# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 1421# and 1988 DST experiments. Go with spin.com.mx. 1422 1423# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15): 1424# A guy from our Mexico subsidiary finally found the Presidential Decree 1425# outlining the timezone changes in Mexico. 1426# 1427# ------------- Begin Forwarded Message ------------- 1428# 1429# I finally got my hands on the Official Presidential Decree that sets up the 1430# rules for the DST changes. The rules are: 1431# 1432# 1. The country is divided in 3 timezones: 1433# - Baja California Norte (the Mexico/BajaNorte TZ) 1434# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 1435# - The rest of the country (the Mexico/General TZ) 1436# 1437# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 1438# at 2:00 AM, the times in each zone are as follows: 1439# BajaNorte: GMT+7 1440# BajaSur: GMT+6 1441# General: GMT+5 1442# 1443# 3. The rest of the year, the times are as follows: 1444# BajaNorte: GMT+8 1445# BajaSur: GMT+7 1446# General: GMT+6 1447# 1448# The Decree was published in Mexico's Official Newspaper on January 4th. 1449# 1450# -------------- End Forwarded Message -------------- 1451# From Paul Eggert (1996-06-12): 1452# For an English translation of the decree, see 1453# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 1454# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 1455# </a> 1456 1457# From Rives McDow (1998-10-08): 1458# The State of Quintana Roo has reverted back to central STD and DST times 1459# (i.e. UTC -0600 and -0500 as of 1998-08-02). 1460 1461# From Rives McDow (2000-01-10): 1462# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 1463# zone 5 hours from the International Date Line, and will not observe daylight 1464# savings time so as to stay on the same time zone as the southern part of 1465# Arizona year round. 1466 1467# From Jesper Norgaard, translating 1468# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 1469# In Oaxaca, the 55.000 teachers from the Section 22 of the National 1470# Syndicate of Education Workers, refuse to apply daylight saving each 1471# year, so that the more than 10,000 schools work at normal hour the 1472# whole year. 1473 1474# From Gwillim Law (2001-01-19): 1475# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 1476# (translated):... 1477# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 1478# that Summer Time will be reduced from seven to five months, starting 1479# this year.... 1480# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> 1481# [translated], says "summer time will ... take effect on the first Sunday 1482# in May, and end on the last Sunday of September. 1483 1484# From Arthur David Olson (2001-01-25): 1485# The 2001-01-24 traditional Washington Post contained the page one 1486# story "Timely Issue Divides Mexicans."... 1487# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 1488# ... Mexico City Mayor Lopez Obrador "...is threatening to keep 1489# Mexico City and its 20 million residents on a different time than 1490# the rest of the country..." In particular, Lopez Obrador would abolish 1491# observation of Daylight Saving Time. 1492 1493# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> 1494# Official statute published by the Energy Department 1495# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 1496# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). 1497 1498# From Paul Eggert (2001-03-03): 1499# 1500# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> 1501# James F. Smith writes in today's LA Times 1502# </a> 1503# * Sonora will continue to observe standard time. 1504# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that 1505# the Federal District will not adopt DST. 1506# * 4 of 16 district leaders announced they'll ignore the decree. 1507# * The decree does not affect federal-controlled facilities including 1508# the airport, banks, hospitals, and schools. 1509# 1510# For now we'll assume that the Federal District will bow to federal rules. 1511 1512# From Jesper Norgaard (2001-04-01): 1513# I found some references to the Mexican application of daylight 1514# saving, which modifies what I had already sent you, stating earlier 1515# that a number of northern Mexican states would go on daylight 1516# saving. The modification reverts this to only cover Baja California 1517# (Norte), while all other states (except Sonora, who has no daylight 1518# saving all year) will follow the original decree of president 1519# Vicente Fox, starting daylight saving May 6, 2001 and ending 1520# September 30, 2001. 1521# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> 1522# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 1523 1524# From Reuters (2001-09-04): 1525# Mexico's Supreme Court on Tuesday declared that daylight savings was 1526# unconstitutional in Mexico City, creating the possibility the 1527# capital will be in a different time zone from the rest of the nation 1528# next year.... The Supreme Court's ruling takes effect at 2:00 1529# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 1530# standard time. "This is so residents of the Federal District are not 1531# subject to unexpected time changes," a statement from the court said. 1532 1533# From Jesper Norgaard Welen (2002-03-12): 1534# ... consulting my local grocery store(!) and my coworkers, they all insisted 1535# that a new decision had been made to reinstate US style DST in Mexico.... 1536# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 1537# confirms this. Sonora as usual is the only state where DST is not applied. 1538 1539# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1540Rule Mexico 1939 only - Feb 5 0:00 1:00 D 1541Rule Mexico 1939 only - Jun 25 0:00 0 S 1542Rule Mexico 1940 only - Dec 9 0:00 1:00 D 1543Rule Mexico 1941 only - Apr 1 0:00 0 S 1544Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 1545Rule Mexico 1944 only - May 1 0:00 0 S 1546Rule Mexico 1950 only - Feb 12 0:00 1:00 D 1547Rule Mexico 1950 only - Jul 30 0:00 0 S 1548Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 1549Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 1550Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 1551Rule Mexico 2001 only - Sep lastSun 2:00 0 S 1552Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 1553Rule Mexico 2002 max - Oct lastSun 2:00 0 S 1554# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1555# Quintana Roo 1556Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 1557 -6:00 - CST 1981 Dec 23 1558 -5:00 Mexico E%sT 1998 Aug 2 2:00 1559 -6:00 Mexico C%sT 1560# Campeche, Yucatan 1561Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 1562 -6:00 - CST 1981 Dec 23 1563 -5:00 - EST 1982 Dec 2 1564 -6:00 Mexico C%sT 1565# Coahuila, Durango, Nuevo Leon, Tamaulipas 1566Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 1567 -6:00 - CST 1988 1568 -6:00 US C%sT 1989 1569 -6:00 Mexico C%sT 1570# Central Mexico 1571Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 1572 -7:00 - MST 1927 Jun 10 23:00 1573 -6:00 - CST 1930 Nov 15 1574 -7:00 - MST 1931 May 1 23:00 1575 -6:00 - CST 1931 Oct 1576 -7:00 - MST 1932 Apr 1 1577 -6:00 Mexico C%sT 2001 Sep 30 02:00 1578 -6:00 - CST 2002 Feb 20 1579 -6:00 Mexico C%sT 1580# Chihuahua 1581Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 1582 -7:00 - MST 1927 Jun 10 23:00 1583 -6:00 - CST 1930 Nov 15 1584 -7:00 - MST 1931 May 1 23:00 1585 -6:00 - CST 1931 Oct 1586 -7:00 - MST 1932 Apr 1 1587 -6:00 - CST 1996 1588 -6:00 Mexico C%sT 1998 1589 -6:00 - CST 1998 Apr Sun>=1 3:00 1590 -7:00 Mexico M%sT 1591# Sonora 1592Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 1593 -7:00 - MST 1927 Jun 10 23:00 1594 -6:00 - CST 1930 Nov 15 1595 -7:00 - MST 1931 May 1 23:00 1596 -6:00 - CST 1931 Oct 1597 -7:00 - MST 1932 Apr 1 1598 -6:00 - CST 1942 Apr 24 1599 -7:00 - MST 1949 Jan 14 1600 -8:00 - PST 1970 1601 -7:00 Mexico M%sT 1999 1602 -7:00 - MST 1603# Baja California Sur, Nayarit, Sinaloa 1604Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 1605 -7:00 - MST 1927 Jun 10 23:00 1606 -6:00 - CST 1930 Nov 15 1607 -7:00 - MST 1931 May 1 23:00 1608 -6:00 - CST 1931 Oct 1609 -7:00 - MST 1932 Apr 1 1610 -6:00 - CST 1942 Apr 24 1611 -7:00 - MST 1949 Jan 14 1612 -8:00 - PST 1970 1613 -7:00 Mexico M%sT 1614# Baja California 1615Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 1616 -7:00 - MST 1924 1617 -8:00 - PST 1927 Jun 10 23:00 1618 -7:00 - MST 1930 Nov 15 1619 -8:00 - PST 1931 Apr 1 1620 -8:00 1:00 PDT 1931 Sep 30 1621 -8:00 - PST 1942 Apr 24 1622 -8:00 1:00 PWT 1945 Nov 12 1623 -8:00 - PST 1948 Apr 5 1624 -8:00 1:00 PDT 1949 Jan 14 1625 -8:00 - PST 1954 1626 -8:00 CA P%sT 1961 1627 -8:00 - PST 1976 1628 -8:00 US P%sT 1996 1629 -8:00 Mexico P%sT 2001 1630 -8:00 US P%sT 2002 Feb 20 1631 -8:00 Mexico P%sT 1632# From Paul Eggert (2001-03-05): 1633# Formerly there was an America/Ensenada zone, which differed from 1634# America/Tijuana only in that it did not observe DST from 1976 1635# through 1995. This was as per Shanks. However, Guy Harris reports 1636# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and 1637# Tijuana observe DST," which contradicts Shanks but does imply that 1638# DST-observance was a town-by-town matter back then. This concerns 1639# data after 1970 so most likely there should be at least one Zone 1640# other than America/Tijuana for Baja, but it's not clear yet what its 1641# name or contents should be. 1642# 1643# Revillagigedo Is 1644# no information 1645 1646############################################################################### 1647 1648# Anguilla 1649# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1650Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 1651 -4:00 - AST 1652 1653# Antigua and Barbuda 1654# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1655Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 1656 -5:00 - EST 1951 1657 -4:00 - AST 1658 1659# Bahamas 1660# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1661Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 1662Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 1663Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 1664# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1665Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 1666 -5:00 Bahamas E%sT 1667 1668# Barbados 1669# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1670Rule Barb 1977 only - Jun 12 2:00 1:00 D 1671Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1672Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1673Rule Barb 1979 only - Sep 30 2:00 0 S 1674Rule Barb 1980 only - Sep 25 2:00 0 S 1675# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1676Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1677 -3:58:28 - BMT 1932 # Bridgetown Mean Time 1678 -4:00 Barb A%sT 1679 1680# Belize 1681# Whitman entirely disagrees with Shanks; go with Shanks. 1682# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1683Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1684Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1685Rule Belize 1973 only - Dec 5 0:00 1:00 D 1686Rule Belize 1974 only - Feb 9 0:00 0 S 1687Rule Belize 1982 only - Dec 18 0:00 1:00 D 1688Rule Belize 1983 only - Feb 12 0:00 0 S 1689# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1690Zone America/Belize -5:52:48 - LMT 1912 Apr 1691 -6:00 Belize C%sT 1692 1693# Bermuda 1694# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1695Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1696 -4:00 - AST 1974 Apr 28 2:00 1697 -4:00 Bahamas A%sT 1698 1699# Cayman Is 1700# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1701Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1702 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1703 -5:00 - EST 1704 1705# Costa Rica 1706# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1707Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1708Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1709Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 1710# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 1711Rule CR 1991 only - Jul 1 0:00 0 S 1712Rule CR 1992 only - Mar 15 0:00 0 S 1713# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1714# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1715Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1716 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 1717 -6:00 CR C%sT 1718# Coco 1719# no information; probably like America/Costa_Rica 1720 1721# Cuba 1722 1723# From Arthur David Olson (1999-03-29): 1724# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 1725# the Cuban National Team and the Baltimore Orioles was carried live on 1726# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 1727# During the game, play-by-play announcer Jim Hunter noted that 1728# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 1729# Time today." (The "two hour" remark referred to losing one hour of 1730# sleep on 1999-03-28--when the announcers were in Cuba as it switched 1731# to DST--and one more hour on 1999-04-04--when the announcers will have 1732# returned to Baltimore, which switches on that date.) 1733 1734# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1735Rule Cuba 1928 only - Jun 10 0:00 1:00 D 1736Rule Cuba 1928 only - Oct 10 0:00 0 S 1737Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 1738Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 1739Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 1740Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 1741Rule Cuba 1965 only - Jun 1 0:00 1:00 D 1742Rule Cuba 1965 only - Sep 30 0:00 0 S 1743Rule Cuba 1966 only - May 29 0:00 1:00 D 1744Rule Cuba 1966 only - Oct 2 0:00 0 S 1745Rule Cuba 1967 only - Apr 8 0:00 1:00 D 1746Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 1747Rule Cuba 1968 only - Apr 14 0:00 1:00 D 1748Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 1749Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 1750Rule Cuba 1972 1974 - Oct 8 0:00 0 S 1751Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 1752Rule Cuba 1978 only - May 7 0:00 1:00 D 1753Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 1754Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 1755Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 1756Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 1757Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 1758Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 1759Rule Cuba 1996 only - Oct 6 0:00s 0 S 1760Rule Cuba 1997 only - Oct 12 0:00s 0 S 1761Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 1762Rule Cuba 1998 max - Oct lastSun 0:00s 0 S 1763Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D 1764 1765# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1766Zone America/Havana -5:29:28 - LMT 1890 1767 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 1768 -5:00 Cuba C%sT 1769 1770# Dominica 1771# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1772Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 1773 -4:00 - AST 1774 1775# Dominican Republic 1776 1777# From Steffen Thorsen (2000-10-30): 1778# Enrique Morales reported to me that the Dominican Republic has changed the 1779# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 1780# http://www.listin.com.do/antes/261000/republica/princi.html 1781 1782# From Paul Eggert (2000-12-04): 1783# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 1784 1785# From Rives McDow (2000-12-01): 1786# Dominican Republic changed its mind and presidential decree on Tuesday, 1787# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 1788# Dominican Republic will be reverting to 8 hours from the International Date 1789# Line, and will not be using DST in the foreseeable future. The reason they 1790# decided to use DST was to be in synch with Puerto Rico, who was also going 1791# to implement DST. When Puerto Rico didn't implement DST, the president 1792# decided to revert. 1793 1794 1795# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1796Rule DR 1966 only - Oct 30 0:00 1:00 D 1797Rule DR 1967 only - Feb 28 0:00 0 S 1798Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 1799Rule DR 1970 only - Feb 21 0:00 0 S 1800Rule DR 1971 only - Jan 20 0:00 0 S 1801Rule DR 1972 1974 - Jan 21 0:00 0 S 1802# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1803Zone America/Santo_Domingo -4:39:36 - LMT 1890 1804 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 1805 -5:00 DR E%sT 1974 Oct 27 1806 -4:00 - AST 2000 Oct 29 02:00 1807 -5:00 US E%sT 2000 Dec 3 01:00 1808 -4:00 - AST 1809 1810# El Salvador 1811# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1812Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 1813Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 1814# There are too many San Salvadors elsewhere, so use America/El_Salvador 1815# instead of America/San_Salvador. 1816# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1817Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 1818 -6:00 Salv C%sT 1819 1820# Grenada 1821# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1822Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 1823 -4:00 - AST 1824 1825# Guadeloupe 1826# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1827Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 1828 -4:00 - AST 1829 1830# Guatemala 1831# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1832Rule Guat 1973 only - Nov 25 0:00 1:00 D 1833Rule Guat 1974 only - Feb 24 0:00 0 S 1834Rule Guat 1983 only - May 21 0:00 1:00 D 1835Rule Guat 1983 only - Sep 22 0:00 0 S 1836Rule Guat 1991 only - Mar 23 0:00 1:00 D 1837Rule Guat 1991 only - Sep 7 0:00 0 S 1838# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1839Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 1840 -6:00 Guat C%sT 1841 1842# Haiti 1843# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1844Rule Haiti 1983 only - May 8 0:00 1:00 D 1845Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 1846Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 1847# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA. 1848Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 1849Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 1850# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1851Zone America/Port-au-Prince -4:49:20 - LMT 1890 1852 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 1853 -5:00 Haiti E%sT 1854 1855# Honduras 1856# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 1857# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1858Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 1859 -6:00 Salv C%sT 1860# 1861# Great Swan I ceded by US to Honduras in 1972 1862 1863# Jamaica 1864 1865# From Bob Devine (1988-01-28): 1866# Follows US rules. 1867 1868# From U. S. Naval Observatory (1989-01-19): 1869# JAMAICA 5 H BEHIND UTC 1870 1871# From Shanks: 1872# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1873Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 1874 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1875 -5:00 - EST 1974 Apr 28 2:00 1876 -5:00 US E%sT 1984 1877 -5:00 - EST 1878 1879# Martinique 1880# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1881Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 1882 -4:04:20 - FFMT 1911 May # Fort-de-France MT 1883 -4:00 - AST 1980 Apr 6 1884 -4:00 1:00 ADT 1980 Sep 28 1885 -4:00 - AST 1886 1887# Montserrat 1888# From Paul Eggert (1997-08-31): 1889# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 1890# Luckily, Olveston, the current de facto capital, has the same longitude. 1891# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1892Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 1893 -4:00 - AST 1894 1895# Nicaragua 1896# 1897# From Steffen Thorsen (1998-12-29): 1898# Nicaragua seems to be back at -6:00 but I have not been able to find when 1899# they changed from -5:00. 1900# 1901# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1902Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 1903Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 1904Rule Nic 1992 only - Jan 1 4:00 1:00 D 1905Rule Nic 1992 only - Sep 24 0:00 0 S 1906# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1907Zone America/Managua -5:45:08 - LMT 1890 1908 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 1909 -6:00 - CST 1973 May 1910 -5:00 - EST 1975 Feb 16 1911 -6:00 Nic C%sT 1993 Jan 1 4:00 1912 -5:00 - EST 1998 Dec 1913 -6:00 - CST 1914 1915# Panama 1916# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1917Zone America/Panama -5:18:08 - LMT 1890 1918 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time 1919 -5:00 - EST 1920 1921# Puerto Rico 1922# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 1923# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1924Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 1925 -4:00 - AST 1942 May 3 1926 -4:00 1:00 AWT 1945 Sep 30 2:00 1927 -4:00 - AST 1928 1929# St Kitts-Nevis 1930# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1931Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 1932 -4:00 - AST 1933 1934# St Lucia 1935# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1936Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 1937 -4:04:00 - CMT 1912 # Castries Mean Time 1938 -4:00 - AST 1939 1940# St Pierre and Miquelon 1941# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 1942# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1943Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 1944 -4:00 - AST 1980 May 1945 -3:00 - PMST 1987 # Pierre & Miquelon Time 1946 -3:00 Canada PM%sT 1947 1948# St Vincent and the Grenadines 1949# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1950Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 1951 -4:04:56 - KMT 1912 # Kingstown Mean Time 1952 -4:00 - AST 1953 1954# Turks and Caicos 1955# From Paul Eggert (1998-08-06): 1956# Shanks says they use US DST rules, but IATA SSIM (1991/1998) 1957# says they switch at midnight. Go with IATA SSIM. 1958# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1959Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D 1960Rule TC 1979 max - Oct lastSun 0:00 0 S 1961Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D 1962# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1963Zone America/Grand_Turk -4:44:32 - LMT 1890 1964 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1965 -5:00 TC E%sT 1966 1967# British Virgin Is 1968# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1969Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 1970 -4:00 - AST 1971 1972# Virgin Is 1973# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1974Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 1975 -4:00 - AST 1976