1# @(#)northamerica 7.74 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 (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 (2005-04-16): 28# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 29# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 30 31# From Paul Eggert (1995-12-19): 32# A good source for time zone historical data in the US is 33# Thomas G. Shanks, The American Atlas (5th edition), 34# San Diego: ACS Publications, Inc. (1991). 35# Make sure you have the errata sheet; the book is somewhat useless without it. 36# It is the source for most of the pre-1991 US and Puerto Rico entries below. 37 38# From Paul Eggert (2001-03-06): 39# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 40# in his whimsical essay ``An Economical Project for Diminishing the Cost 41# of Light'' published in the Journal de Paris (1784-04-26). 42# Not everyone is happy with the results: 43# 44# I don't really care how time is reckoned so long as there is some 45# agreement about it, but I object to being told that I am saving 46# daylight when my reason tells me that I am doing nothing of the kind. 47# I even object to the implication that I am wasting something 48# valuable if I stay in bed after the sun has risen. As an admirer 49# of moonlight I resent the bossy insistence of those who want to 50# reduce my time for enjoying it. At the back of the Daylight Saving 51# scheme I detect the bony, blue-fingered hand of Puritanism, eager 52# to push people into bed earlier, and get them up earlier, to make 53# them healthy, wealthy and wise in spite of themselves. 54# 55# -- Robertson Davies, The diary of Samuel Marchbanks, 56# Clarke, Irwin (1947), XIX, Sunday 57# 58# For more about the first ten years of DST in the United States, see 59# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html"> 60# Ten years of daylight saving from the Pittsburgh standpoint 61# (Carnegie Library of Pittsburgh, 1927)</a>. 62# 63# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 64# However, DST was imposed by the Standard Time Act of 1918, which 65# was the first nationwide legal time standard, and apparently 66# time was just called "Standard Time" or "Daylight Saving Time". 67 68# From Arthur David Olson: 69# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 70# See, for example, the front page of the Saturday, 1974-10-26 71# and Sunday, 1974-10-27 editions of the Washington Post. 72 73# From Arthur David Olson: 74# Before the Uniform Time Act of 1966 took effect in 1967, observance of 75# Daylight Saving Time in the US was by local option, except during wartime. 76 77# From Arthur David Olson (2000-09-25): 78# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 79# In the introduction, Oboler spoke of "Eastern Peace Time." 80# An AltaVista search turned up 81# <a href="http://rowayton.org/rhs/hstaug45.html">: 82# "When the time is announced over the radio now, it is 'Eastern Peace 83# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 84# </a> (August 1945) by way of confirmation. 85 86# From Joseph Gallant <notquite@hotmail.com>, citing 87# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 88# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 89# to switch to London for Attlee's address, but the American people 90# never got to hear his speech live. According to one press account, 91# CBS' Bob Trout was first to announce the word of Japan's surrender, 92# but a few seconds later, NBC, ABC and Mutual also flashed the word 93# of surrender, all of whom interrupting the bells of Big Ben in 94# London which were to precede Mr. Attlee's speech. 95 96# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 97# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 98# 99# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 100# Any announcement from Asia would reach St. John's New York newsroom on a 101# wire service teletype machine, which had prescribed signals for major news. 102# Associated Press, for example, would ring five bells before spewing out 103# typed copy of an important story, and 10 bells for news "of transcendental 104# importance." 105# 106# On Aug. 14, stalling while talking steadily into the NBC networks' open 107# microphone, St. John heard five bells and waited only to hear a sixth bell, 108# before announcing confidently: "Ladies and gentlemen, World War II is over. 109# The Japanese have agreed to our surrender terms." 110# 111# He had scored a 20-second scoop on other broadcasters. 112 113# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 114Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 115Rule US 1918 1919 - Oct lastSun 2:00 0 S 116Rule US 1942 only - Feb 9 2:00 1:00 W # War 117Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 118Rule US 1945 only - Sep 30 2:00 0 S 119Rule US 1967 max - Oct lastSun 2:00 0 S 120Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 121Rule US 1974 only - Jan 6 2:00 1:00 D 122Rule US 1975 only - Feb 23 2:00 1:00 D 123Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 124Rule US 1987 max - Apr Sun>=1 2:00 1:00 D 125# <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:"> 126# H.R.177 127# </a> (introduced 1999-01-06) would change April to March in the above rule. 128 129# From Bob Devine (1988-01-28): 130# ...Alaska (and Hawaii) had the timezone names changed in 1967. 131# old new 132# Pacific Standard Time(PST) -same- 133# Yukon Standard Time(YST) -same- 134# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 135# Nome Standard Time (NT) Bering Standard Time (BST) 136# 137# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 138# The YST zone now covers nearly all of the state, AHST just part 139# of the Aleutian islands. No DST. 140 141# From Paul Eggert (1995-12-19): 142# The tables below use `NST', not `NT', for Nome Standard Time. 143# I invented `CAWT' for Central Alaska War Time. 144 145# From U. S. Naval Observatory (1989-01-19): 146# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 147# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 148# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 149# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 150# USA MOUNTAIN 7 H BEHIND UTC DENVER 151# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 152# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 153# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 154# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 155# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 156# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 157# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 158# USA HAWAII 10 H BEHIND UTC 159# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 160 161# From Arthur David Olson (1989-01-21): 162# The above dates are for 1988. 163# Note the "AKST" and "AKDT" abbreviations, the claim that there's 164# no DST in Samoa, and the claim that there is DST in Alaska and the 165# Aleutians. 166 167# From Arthur David Olson (1988-02-13): 168# Legal standard time zone names, from United States Code (1982 Edition and 169# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 170# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 171# took effect), as explained in sections 263 and 261: 172# (none) 173# United States standard eastern time 174# United States standard mountain time 175# United States standard central time 176# United States standard Pacific time 177# (none) 178# United States standard Alaska time 179# (none) 180# Next, names from 1967-04-01 until 1983-11-30 (the date for 181# public law 98-181): 182# Atlantic standard time 183# eastern standard time 184# central standard time 185# mountain standard time 186# Pacific standard time 187# Yukon standard time 188# Alaska-Hawaii standard time 189# Bering standard time 190# And after 1983-11-30: 191# Atlantic standard time 192# eastern standard time 193# central standard time 194# mountain standard time 195# Pacific standard time 196# Alaska standard time 197# Hawaii-Aleutian standard time 198# Samoa standard time 199# The law doesn't give abbreviations. 200# 201# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 202# Public law 106-564 (2000-12-23) introduced the abbreviation 203# "Chamorro Standard Time" for time in Guam and the Northern Marianas. 204# See the file "australasia". 205 206 207# US eastern time, represented by New York 208 209# Connecticut, Delaware, District of Columbia, most of Florida, 210# Georgia, southeast Indiana (Clark, Dearborn, Floyd, Harrison, and 211# Ohio counties), eastern Kentucky, Maine, Maryland, Massachusetts, 212# New Hampshire, New Jersey, New York, North Carolina, Ohio, 213# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 214# Vermont, Virginia, West Virginia 215 216# From Dave Cantor (2004-11-02): 217# Early this summer I had the occasion to visit the Mount Washington 218# Observatory weather station atop (of course!) Mount Washington [, NH].... 219# One of the staff members said that the station was on Eastern Standard Time 220# and didn't change their clocks for Daylight Saving ... so that their 221# reports will always have times which are 5 hours behind UTC. 222 223# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 224Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 225Rule NYC 1920 only - Oct lastSun 2:00 0 S 226Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 227Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 228Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 229# Zone NAME GMTOFF RULES FORMAT [UNTIL] 230Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 231 -5:00 US E%sT 1920 232 -5:00 NYC E%sT 1942 233 -5:00 US E%sT 1946 234 -5:00 NYC E%sT 1967 235 -5:00 US E%sT 236 237# US central time, represented by Chicago 238 239# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 240# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 241# Washington counties), Illinois, western Indiana 242# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 243# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 244# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 245# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 246# western Tennessee, most of Texas, Wisconsin 247 248# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 249Rule Chicago 1920 only - Jun 13 2:00 1:00 D 250Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 251Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 252Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 253Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 254Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 255# Zone NAME GMTOFF RULES FORMAT [UNTIL] 256Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 257 -6:00 US C%sT 1920 258 -6:00 Chicago C%sT 1936 Mar 1 2:00 259 -5:00 - EST 1936 Nov 15 2:00 260 -6:00 Chicago C%sT 1942 261 -6:00 US C%sT 1946 262 -6:00 Chicago C%sT 1967 263 -6:00 US C%sT 264# Oliver County, ND switched from mountain to central time on 1992-10-25. 265Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 266 -7:00 US M%sT 1992 Oct 25 02:00 267 -6:00 US C%sT 268 269# US mountain time, represented by Denver 270# 271# Colorado, far western Kansas, Montana, western 272# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 273# New Mexico, southwestern North Dakota, far eastern Oregon, 274# western South Dakota, far western Texas (El Paso County, Hudspeth County, 275# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 276# 277# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 278Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 279Rule Denver 1920 only - Oct lastSun 2:00 0 S 280Rule Denver 1921 only - May 22 2:00 0 S 281Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 282Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 283# Zone NAME GMTOFF RULES FORMAT [UNTIL] 284Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 285 -7:00 US M%sT 1920 286 -7:00 Denver M%sT 1942 287 -7:00 US M%sT 1946 288 -7:00 Denver M%sT 1967 289 -7:00 US M%sT 290 291# US Pacific time, represented by Los Angeles 292# 293# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 294# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties), 295# most of Nevada, most of Oregon, and Washington 296# 297# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 298Rule CA 1948 only - Mar 14 2:00 1:00 D 299Rule CA 1949 only - Jan 1 2:00 0 S 300Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 301Rule CA 1950 1961 - Sep lastSun 2:00 0 S 302Rule CA 1962 1966 - Oct lastSun 2:00 0 S 303# Zone NAME GMTOFF RULES FORMAT [UNTIL] 304Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 305 -8:00 US P%sT 1946 306 -8:00 CA P%sT 1967 307 -8:00 US P%sT 308 309# Alaska 310# AK%sT is the modern abbreviation for -9:00 per USNO. 311# 312# From Paul Eggert (2001-05-30): 313# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 314# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 315# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 316# also a Friday. Include only the time zone part of this transition, 317# ignoring the switch from Julian to Gregorian, since we can't represent 318# the Julian calendar. 319# 320# As far as we know, none of the exact locations mentioned below were 321# permanently inhabited in 1867 by anyone using either calendar. 322# (Yakutat was colonized by the Russians in 1799, but the settlement 323# was destroyed in 1805 by a Yakutat-kon war party.) However, there 324# were nearby inhabitants in some cases and for our purposes perhaps 325# it's best to simply use the official transition. 326# 327# Zone NAME GMTOFF RULES FORMAT [UNTIL] 328Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 329 -8:57:41 - LMT 1900 Aug 20 12:00 330 -8:00 - PST 1942 331 -8:00 US P%sT 1946 332 -8:00 - PST 1969 333 -8:00 US P%sT 1983 Oct 30 2:00 334 -9:00 US Y%sT 1983 Nov 30 335 -9:00 US AK%sT 336Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 337 -9:18:55 - LMT 1900 Aug 20 12:00 338 -9:00 - YST 1942 339 -9:00 US Y%sT 1946 340 -9:00 - YST 1969 341 -9:00 US Y%sT 1983 Nov 30 342 -9:00 US AK%sT 343Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 344 -9:59:36 - LMT 1900 Aug 20 12:00 345 -10:00 - CAT 1942 346 -10:00 US CAT/CAWT 1946 347 -10:00 - CAT 1967 Apr 348 -10:00 - AHST 1969 349 -10:00 US AH%sT 1983 Oct 30 2:00 350 -9:00 US Y%sT 1983 Nov 30 351 -9:00 US AK%sT 352Zone America/Nome 12:58:21 - LMT 1867 Oct 18 353 -11:01:38 - LMT 1900 Aug 20 12:00 354 -11:00 - NST 1942 355 -11:00 US N%sT 1946 356 -11:00 - NST 1967 Apr 357 -11:00 - BST 1969 358 -11:00 US B%sT 1983 Oct 30 2:00 359 -9:00 US Y%sT 1983 Nov 30 360 -9:00 US AK%sT 361Zone America/Adak 12:13:21 - LMT 1867 Oct 18 362 -11:46:38 - LMT 1900 Aug 20 12:00 363 -11:00 - NST 1942 364 -11:00 US N%sT 1946 365 -11:00 - NST 1967 Apr 366 -11:00 - BST 1969 367 -11:00 US B%sT 1983 Oct 30 2:00 368 -10:00 US AH%sT 1983 Nov 30 369 -10:00 US HA%sT 370# The following switches don't quite make our 1970 cutoff. 371# 372# Shanks writes that part of southwest Alaska (e.g. Aniak) 373# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 374# and another part (e.g. Akiak) made the same switch five weeks later. 375# 376# From David Flater (2004-11-09): 377# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 378# Historic Preservation Commission, provided this information, which 379# suggests that Unalaska deviated from statutory time from early 1967 380# possibly until 1983: 381# 382# Minutes of the Unalaska City Council Meeting, January 10, 1967: 383# "Except for St. Paul and Akutan, Unalaska is the only important 384# location not on Alaska Standard Time. The following resolution was 385# made by William Robinson and seconded by Henry Swanson: Be it 386# resolved that the City of Unalaska hereby goes to Alaska Standard 387# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 388# January 14, Alaska Standard Time.) This resolution was passed with 389# three votes for and one against." 390 391# Hawaii 392# 393# From Arthur David Olson: 394# And then there's Hawaii. 395# DST was observed for one day in 1933; 396# standard time was changed by half an hour in 1947; 397# it's always standard as of 1986. 398# 399# From Paul Eggert: 400# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 401# 402Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 403 -10:30 - HST 1933 Apr 30 2:00 404 -10:30 1:00 HDT 1933 May 21 2:00 405 -10:30 US H%sT 1947 Jun 8 2:00 406 -10:00 - HST 407 408# Now we turn to US areas that have diverged from the consensus since 1970. 409 410# Arizona mostly uses MST. 411 412# From Paul Eggert (2002-10-20): 413# 414# The information in the rest of this paragraph is derived from the 415# <a href="http://www.dlapr.lib.az.us/links/daylight.htm"> 416# Daylight Saving Time web page (2002-01-23)</a> maintained by the 417# Arizona State Library, Archives and Public Records. 418# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 419# time, but by federal law railroads, airlines, bus lines, military 420# personnel, and some engaged in interstate commerce continued to 421# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 422# Gazette says that was the date the law changed, and that 04-01 was 423# the date the state's clocks would change. In 1945 the State of 424# Arizona used standard time all year, again with exceptions only as 425# mandated by federal law. Arizona observed DST in 1967, but Arizona 426# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 427# 428# Shanks says the 1944 experiment came to an end on 1944-03-17. 429# Go with the Arizona State Library instead. 430 431Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 432 -7:00 US M%sT 1944 Jan 1 00:01 433 -7:00 - MST 1944 Apr 1 00:01 434 -7:00 US M%sT 1944 Oct 1 00:01 435 -7:00 - MST 1967 436 -7:00 US M%sT 1968 Mar 21 437 -7:00 - MST 438# From Arthur David Olson (1988-02-13): 439# A writer from the Inter Tribal Council of Arizona, Inc., 440# notes in private correspondence dated 1987-12-28 that "Presently, only the 441# Navajo Nation participates in the Daylight Saving Time policy, due to its 442# large size and location in three states." (The "only" means that other 443# tribal nations don't use DST.) 444 445Link America/Denver America/Shiprock 446 447# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 448# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 449# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 450# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 451# Teton, Twin Falls, Valley, Washington counties) and eastern Oregon 452# switched four weeks late in 1974. 453# 454# Zone NAME GMTOFF RULES FORMAT [UNTIL] 455Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 456 -8:00 US P%sT 1923 May 13 2:00 457 -7:00 US M%sT 1974 458 -7:00 - MST 1974 Feb 3 2:00 459 -7:00 US M%sT 460 461# Indiana 462# 463# For a map of Indiana's time zone regions, see: 464# <a href="http://www.mccsc.edu/time.html"> 465# What time is it in Indiana? 466# </a> (1999-04-06) 467# 468# From Paul Eggert (1995-12-19): 469# Indiana generally observes either EST all year, or CST/CDT, 470# but areas near Cincinnati and Louisville use those cities' timekeeping 471# and in 1969 and 1970 the whole state observed daylight time; 472# and there are other exceptions as noted below. 473# Shanks partitions Indiana into 345 regions, each with its own time history, 474# and writes ``Even newspaper reports present contradictory information.'' 475# Fortunately, most of the complexity occurred before our cutoff date of 1970. 476# 477# Since 1970, EST-only Indiana has been like America/Indianapolis, 478# with exceptions noted below for Crawford, Starke, and Switzerland counties. 479# The parts of Indiana not listed below have been like America/Chicago, 480# America/Louisville, or America/New_York. 481# 482# Other than Indianapolis, the Indiana place names are so nondescript 483# that they would be ambiguous if we left them at the `America' level. 484# So we reluctantly put them all in a subdirectory `America/Indiana'. 485# 486# Most of EST-only Indiana last observed DST in 1970. 487 488# From Paul Eggert (2001-03-06), following a tip by Markus Kuhn: 489# Pam Belluck reported in the New York Times (2001-01-31) that the 490# Indiana Legislature is considering a bill to adopt DST statewide. 491# Her article mentioned Vevay, whose post office observes a different 492# time zone from Danner's Hardware across the street. 493 494# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 495Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 496Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 497Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 498# Zone NAME GMTOFF RULES FORMAT [UNTIL] 499Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 500 -6:00 US C%sT 1920 501 -6:00 Indianapolis C%sT 1942 502 -6:00 US C%sT 1946 503 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 504 -5:00 - EST 1957 Sep 29 2:00 505 -6:00 - CST 1958 Apr 27 2:00 506 -5:00 - EST 1969 507 -5:00 US E%sT 1971 508 -5:00 - EST 509Link America/Indianapolis America/Indiana/Indianapolis 510# 511# Part of Crawford County, Indiana, last observed DST in 1975, 512# and left its clocks alone in 1974. 513# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 514Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 515Rule Marengo 1951 only - Sep lastSun 2:00 0 S 516Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 517Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 518# Zone NAME GMTOFF RULES FORMAT [UNTIL] 519Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 520 -6:00 US C%sT 1951 521 -6:00 Marengo C%sT 1961 Apr 30 2:00 522 -5:00 - EST 1969 523 -5:00 US E%sT 1974 Jan 6 2:00 524 -6:00 1:00 CDT 1974 Oct 27 2:00 525 -5:00 US E%sT 1976 526 -5:00 - EST 527# 528# Starke County, Indiana 529# From Arthur David Olson (1991-10-28): 530# An article on page A3 of the Sunday, 1991-10-27 Washington Post 531# notes that Starke County switched from Central time to Eastern time as of 532# 1991-10-27. 533# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 534Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 535Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 536Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 537Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 538Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 539# Zone NAME GMTOFF RULES FORMAT [UNTIL] 540Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 541 -6:00 US C%sT 1947 542 -6:00 Starke C%sT 1962 Apr 29 2:00 543 -5:00 - EST 1963 Oct 27 2:00 544 -6:00 US C%sT 1991 Oct 27 2:00 545 -5:00 - EST 546# 547# Switzerland County, Indiana, last observed DST in 1972. 548# Zone NAME GMTOFF RULES FORMAT [UNTIL] 549Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 550 -6:00 US C%sT 1954 Apr 25 2:00 551 -5:00 - EST 1969 552 -5:00 US E%sT 1973 553 -5:00 - EST 554 555# Part of Kentucky left its clocks alone in 1974. 556# This also includes a part of Indiana immediately adjacent to Louisville. 557# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 558Rule Louisville 1921 only - May 1 2:00 1:00 D 559Rule Louisville 1921 only - Sep 1 2:00 0 S 560Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 561Rule Louisville 1941 only - Sep lastSun 2:00 0 S 562Rule Louisville 1946 only - Jun 2 2:00 0 S 563Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 564Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 565# Zone NAME GMTOFF RULES FORMAT [UNTIL] 566Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 567 -6:00 US C%sT 1921 568 -6:00 Louisville C%sT 1942 569 -6:00 US C%sT 1946 570 -6:00 Louisville C%sT 1961 Jul 23 2:00 571 -5:00 - EST 1968 572 -5:00 US E%sT 1974 Jan 6 2:00 573 -6:00 1:00 CDT 1974 Oct 27 2:00 574 -5:00 US E%sT 575Link America/Louisville America/Kentucky/Louisville 576# 577# Wayne, Clinton, and Russell Counties, Kentucky 578# 579# From 580# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 581# Lake Cumberland LIFE 582# </a> (1999-01-29) via WKYM-101.7: 583# Clinton County has joined Wayne County in asking the DoT to change from 584# the Central to the Eastern time zone.... The Wayne County government made 585# the same request in December. And while Russell County officials have not 586# taken action, the majority of respondents to a poll conducted there in 587# August indicated they would like to change to "fast time" also. 588# The three Lake Cumberland counties are the farthest east of any U.S. 589# location in the Central time zone. 590# 591# From Rich Wales (2000-08-29): 592# After prolonged debate, and despite continuing deep differences of opinion, 593# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 594# (-0500) time. They won't "fall back" this year. See Sara Shipley, 595# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 596# 597# From Paul Eggert (2001-07-16): 598# The final rule was published in the 599# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> 600# Federal Register 65, 160 (2000-08-17), page 50154-50158. 601# </a> 602# 603Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 604 -6:00 US C%sT 1946 605 -6:00 - CST 1968 606 -6:00 US C%sT 2000 Oct 29 2:00 607 -5:00 US E%sT 608 609 610# From Rives McDow (2000-08-30): 611# Here ... are all the changes in the US since 1985. 612# Kearny County, KS (put all of county on central; 613# previously split between MST and CST) ... 1990-10 614# Starke County, IN (from CST to EST) ... 1991-10 615# Oliver County, ND (from MST to CST) ... 1992-10 616# West Wendover, NV (from PST TO MST) ... 1999-10 617# Wayne County, KY (from CST to EST) ... 2000-10 618# 619# From Paul Eggert (2001-07-17): 620# We don't know where the line used to be within Kearny County, KS, 621# so omit that change for now. 622# See America/Indiana/Knox for the Starke County, IN change. 623# See America/North_Dakota/Center for the Oliver County, ND change. 624# West Wendover, NV officially switched from Pacific to mountain time on 625# 1999-10-31. See the 626# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> 627# Federal Register 64, 203 (1999-10-21), page 56705-56707. 628# </a> 629# However, the Federal Register says that West Wendover already operated 630# on mountain time, and the rule merely made this official; 631# hence a separate tz entry is not needed. 632 633# Michigan 634# 635# From Bob Devine (1988-01-28): 636# Michigan didn't observe DST from 1968 to 1973. 637# 638# From Paul Eggert (1999-03-31): 639# Shanks writes that Michigan started using standard time on 1885-09-18, 640# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 641# that Detroit kept 642# 643# local time until 1900 when the City Council decreed that clocks should 644# be put back twenty-eight minutes to Central Standard Time. Half the 645# city obeyed, half refused. After considerable debate, the decision 646# was rescinded and the city reverted to Sun time. A derisive offer to 647# erect a sundial in front of the city hall was referred to the 648# Committee on Sewers. Then, in 1905, Central time was adopted 649# by city vote. 650# 651# This story is too entertaining to be false, so go with Howse over Shanks. 652# 653# From Paul Eggert (2001-03-06): 654# Garland (1927) writes ``Cleveland and Detroit advanced their clocks 655# one hour in 1914.'' This change is not in Shanks. We have no more 656# info, so omit this for now. 657# 658# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 659# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 660Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 661Rule Detroit 1948 only - Sep lastSun 2:00 0 S 662Rule Detroit 1967 only - Jun 14 2:00 1:00 D 663Rule Detroit 1967 only - Oct lastSun 2:00 0 S 664# Zone NAME GMTOFF RULES FORMAT [UNTIL] 665Zone America/Detroit -5:32:11 - LMT 1905 666 -6:00 - CST 1915 May 15 2:00 667 -5:00 - EST 1942 668 -5:00 US E%sT 1946 669 -5:00 Detroit E%sT 1973 670 -5:00 US E%sT 1975 671 -5:00 - EST 1975 Apr 27 2:00 672 -5:00 US E%sT 673# 674# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 675# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 676Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 677Rule Menominee 1946 only - Sep lastSun 2:00 0 S 678Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 679Rule Menominee 1966 only - Oct lastSun 2:00 0 S 680# Zone NAME GMTOFF RULES FORMAT [UNTIL] 681Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 682 -6:00 US C%sT 1946 683 -6:00 Menominee C%sT 1969 Apr 27 2:00 684 -5:00 - EST 1973 Apr 29 2:00 685 -6:00 US C%sT 686 687# Navassa 688# administered by the US Fish and Wildlife Service 689# claimed by US under the provisions of the 1856 Guano Islands Act 690# also claimed by Haiti 691# occupied 1857/1900 by the Navassa Phosphate Co 692# US lighthouse 1917/1996-09 693# currently uninhabited 694# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 695# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 696# Jimmy Skaggs, _The Great Guano Rush_ (1994). 697 698# Old names, for S5 users 699 700# Link LINK-FROM LINK-TO 701Link America/New_York EST5EDT 702Link America/Chicago CST6CDT 703Link America/Denver MST7MDT 704Link America/Los_Angeles PST8PDT 705Link America/Indianapolis EST 706Link America/Phoenix MST 707Link Pacific/Honolulu HST 708 709################################################################################ 710 711 712# From Paul Eggert (1999-10-29): 713# A good source for time zone historical data outside the US is 714# Thomas G. Shanks, The International Atlas (5th edition), 715# San Diego: ACS Publications, Inc. (1999). 716# 717# Gwillim Law writes that a good source 718# for recent time zone data is the International Air Transport 719# Association's Standard Schedules Information Manual (IATA SSIM), 720# published semiannually. Law sent in several helpful summaries 721# of the IATA's data after 1990. 722# 723# Except where otherwise noted, Shanks is the source for entries through 1990, 724# and IATA SSIM is the source for entries after 1990. 725# 726# Other sources occasionally used include: 727# 728# Edward W. Whitman, World Time Differences, 729# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 730# which I found in the UCLA library. 731# 732# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf"> 733# William Willett, The Waste of Daylight, 19th edition 734# </a> (1914-03) 735# 736# See the `europe' file for Greenland. 737 738# Canada 739 740# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 741# I post here the time zone abbreviations standardized in Canada 742# for both English and French in the CAN/CSA-Z234.4-89 standard.... 743# 744# UTC Standard time Daylight savings time 745# offset French English French English 746# -2:30 - - HAT NDT 747# -3 - - HAA ADT 748# -3:30 HNT NST - - 749# -4 HNA AST HAE EDT 750# -5 HNE EST HAC CDT 751# -6 HNC CST HAR MDT 752# -7 HNR MST HAP PDT 753# -8 HNP PST HAY YDT 754# -9 HNY YST - - 755# 756# HN: Heure Normale ST: Standard Time 757# HA: Heure Avanc<e'>e DT: Daylight saving Time 758# 759# A: de l'Atlantique Atlantic 760# C: du Centre Central 761# E: de l'Est Eastern 762# M: Mountain 763# N: Newfoundland 764# P: du Pacifique Pacific 765# R: des Rocheuses 766# T: de Terre-Neuve 767# Y: du Yukon Yukon 768# 769# From Paul Eggert (1994-11-22): 770# Alas, this sort of thing must be handled by localization software. 771 772# Unless otherwise specified, the data for Canada are all from Shanks. 773 774# From Paul Eggert (2000-10-02): 775# H. David Matthews and Mary Vincent's map 776# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm"> 777# "It's about TIME", _Canadian Geographic_ (September-October 1998) 778# </a> contains detailed boundaries for regions observing nonstandard 779# time and daylight saving time arrangements in Canada circa 1998. 780# 781# INMS, the Institute for National Measurement Standards in Ottawa, has 782# <a href="http://www.nrc.ca/inms/time/tze.html"> 783# information about standard and daylight saving time zones in Canada. 784# </a> (updated periodically). 785# Its unofficial information is often taken from Matthews and Vincent. 786 787# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 788Rule Canada 1918 only - Apr 14 2:00 1:00 D 789Rule Canada 1918 only - Oct 31 2:00 0 S 790Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 791Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 792Rule Canada 1945 only - Sep 30 2:00 0 S 793Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 794Rule Canada 1974 max - Oct lastSun 2:00 0 S 795Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 796 797 798# Newfoundland (and far southeast Labrador) 799 800# From Paul Eggert (2000-10-02): 801# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 802# but the only part of Labrador that follows the rules is the 803# southeast corner, including Port Hope Simpson and Mary's Harbour, 804# but excluding, say, Black Tickle. 805 806# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 807Rule StJohns 1917 only - Apr 8 2:00 1:00 D 808Rule StJohns 1917 only - Sep 17 2:00 0 S 809# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 810Rule StJohns 1919 only - May 5 23:00 1:00 D 811Rule StJohns 1919 only - Aug 12 23:00 0 S 812# For 1931-1935 Whitman gives Apr same date; go with Shanks. 813Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 814Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 815# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks. 816Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 817Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 818# Whitman gives the following transitions: 819# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 820# but go with Shanks and assume they used Canadian rules. 821# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 822# Apr 30 - Sep 24; go with Shanks. 823Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 824Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 825Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 826Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 827Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 828# From Paul Eggert (2000-10-02): 829# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 830# at 00:01 local time. For now, assume it started in 1987. 831Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 832Rule StJohns 1987 max - Oct lastSun 0:01 0 S 833Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 834Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D 835# St John's has an apostrophe, but Posix file names can't have apostrophes. 836# Zone NAME GMTOFF RULES FORMAT [UNTIL] 837Zone America/St_Johns -3:30:52 - LMT 1884 838 -3:30:52 StJohns N%sT 1918 839 -3:30:52 Canada N%sT 1919 840 -3:30:52 StJohns N%sT 1935 Mar 30 841 -3:30 StJohns N%sT 1942 May 11 842 -3:30 Canada N%sT 1946 843 -3:30 StJohns N%sT 844 845# most of east Labrador 846 847# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 848# Zone NAME GMTOFF RULES FORMAT [UNTIL] 849Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 850 -3:30:52 - NST 1918 851 -3:30:52 Canada N%sT 1919 852 -3:30:52 - NST 1935 Mar 30 853 -3:30 - NST 1936 854 -3:30 StJohns N%sT 1942 May 11 855 -3:30 Canada N%sT 1946 856 -3:30 StJohns N%sT 1966 Mar 15 2:00 857 -4:00 StJohns A%sT 858 859 860# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 861 862# From Paul Eggert (1996-06-12): 863# Shanks writes that since 1970 most of this region has been like Halifax. 864# Many locales did not observe peacetime DST until 1972; 865# Glace Bay, NS is the largest that we know of. 866# Shanks also writes that Liverpool, NS was the only town in Canada to observe 867# DST in 1971 but not 1970; for now we'll assume this is a typo. 868 869# From Paul Eggert (2000-10-02): 870# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches 871# at 00:01 local time. FIXME: verify and create a new Zone for this. 872 873 874# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 875Rule Halifax 1916 only - Apr 1 0:00 1:00 D 876Rule Halifax 1916 only - Oct 1 0:00 0 S 877Rule Halifax 1920 only - May 9 0:00 1:00 D 878Rule Halifax 1920 only - Aug 29 0:00 0 S 879Rule Halifax 1921 only - May 6 0:00 1:00 D 880Rule Halifax 1921 1922 - Sep 5 0:00 0 S 881Rule Halifax 1922 only - Apr 30 0:00 1:00 D 882Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 883Rule Halifax 1923 only - Sep 4 0:00 0 S 884Rule Halifax 1924 only - Sep 15 0:00 0 S 885Rule Halifax 1925 only - Sep 28 0:00 0 S 886Rule Halifax 1926 only - May 16 0:00 1:00 D 887Rule Halifax 1926 only - Sep 13 0:00 0 S 888Rule Halifax 1927 only - May 1 0:00 1:00 D 889Rule Halifax 1927 only - Sep 26 0:00 0 S 890Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 891Rule Halifax 1928 only - Sep 9 0:00 0 S 892Rule Halifax 1929 only - Sep 3 0:00 0 S 893Rule Halifax 1930 only - Sep 15 0:00 0 S 894Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 895Rule Halifax 1932 only - May 1 0:00 1:00 D 896Rule Halifax 1933 only - Apr 30 0:00 1:00 D 897Rule Halifax 1933 only - Oct 2 0:00 0 S 898Rule Halifax 1934 only - May 20 0:00 1:00 D 899Rule Halifax 1934 only - Sep 16 0:00 0 S 900Rule Halifax 1935 only - Jun 2 0:00 1:00 D 901Rule Halifax 1935 only - Sep 30 0:00 0 S 902Rule Halifax 1936 only - Jun 1 0:00 1:00 D 903Rule Halifax 1936 only - Sep 14 0:00 0 S 904Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 905Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 906Rule Halifax 1939 only - May 28 0:00 1:00 D 907Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 908Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 909Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 910Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 911Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 912Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 913Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 914Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 915Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 916# Zone NAME GMTOFF RULES FORMAT [UNTIL] 917Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 918 -4:00 Halifax A%sT 1918 919 -4:00 Canada A%sT 1919 920 -4:00 Halifax A%sT 1942 Feb 9 2:00s 921 -4:00 Canada A%sT 1946 922 -4:00 Halifax A%sT 1974 923 -4:00 Canada A%sT 924Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 925 -4:00 Canada A%sT 1953 926 -4:00 Halifax A%sT 1954 927 -4:00 - AST 1972 928 -4:00 Halifax A%sT 1974 929 -4:00 Canada A%sT 930 931 932# Ontario, Quebec 933 934# From Paul Eggert (1996-06-12): 935# Shanks writes that since 1970 most of Ontario has been like Toronto, 936# and most of Quebec has been like Montreal. 937# Thunder Bay skipped DST in 1973. 938# Many smaller locales did not observe peacetime DST until 1974; 939# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 940# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 941 942# From Mark Brader (2003-07-26): 943# [According to the Toronto Star] Orillia, Ontario, adopted DST 944# effective Saturday, 1912-06-22, 22:00; the article mentions that 945# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 946# have already done so. In Orillia DST was to run until Saturday, 947# 1912-08-31 (no time mentioned), but it was met with considerable 948# hostility from certain segments of the public, and was revoked after 949# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but 950# presumably that should be -07-06. (1912-06-19, -07-12; also letters 951# earlier in June). 952# 953# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 954 955# From Paul Eggert (1997-10-17): 956# Mark Brader writes that an article in the 1997-10-14 Toronto Star 957# says that Atikokan, Ontario currently does not observe DST, 958# but will vote on 11-10 whether to use EST/EDT. 959# He also writes that the 960# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 961# Ontario Time Act (1990, Chapter T.9) 962# </a> 963# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 964# Officially Atikokan is therefore on CST/CDT, and most likely this report 965# concerns a non-official time observed as a matter of local practice. 966# For what it's worth, Shanks says that Atikokan has agreed with 967# Rainy River ever since standard time was introduced. 968 969# From Paul Eggert (2000-10-02): 970# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 971# New Osnaburgh observe CST all year, that Big Trout Lake observes 972# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 973# violation of the official Ontario rules. 974# They also write that Quebec east of the -63 meridian is supposed to 975# observe AST, but residents as far east as Natashquan use EST/EDT, 976# and residents east of Natashquan use AST. 977# We probably need Zones for far east Quebec and for Atikokan, 978# but we don't know when their practices started. 979 980# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 981Rule Mont 1917 only - Mar 25 2:00 1:00 D 982Rule Mont 1917 only - Apr 24 0:00 0 S 983Rule Mont 1919 only - Mar 31 2:30 1:00 D 984Rule Mont 1919 only - Oct 25 2:30 0 S 985Rule Mont 1920 only - May 2 2:30 1:00 D 986Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S 987Rule Mont 1921 only - May 1 2:00 1:00 D 988Rule Mont 1922 only - Apr 30 2:00 1:00 D 989Rule Mont 1924 only - May 17 2:00 1:00 D 990Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 991Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 992# The 1927-to-1937 rules can be expressed more simply as 993# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D 994# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S 995# The rules below avoid use of 24:00 996# (which pre-1998 versions of zic cannot handle). 997Rule Mont 1927 only - May 1 0:00 1:00 D 998Rule Mont 1927 1932 - Sep lastSun 0:00 0 S 999Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D 1000Rule Mont 1932 only - May 1 0:00 1:00 D 1001Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D 1002Rule Mont 1933 only - Oct 1 0:00 0 S 1003Rule Mont 1934 1939 - Sep lastSun 0:00 0 S 1004Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D 1005Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 1006Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 1007Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 1008Rule Mont 1957 1973 - Oct lastSun 2:00 0 S 1009 1010Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1011Rule Toronto 1919 only - Oct 26 0:00 0 S 1012Rule Toronto 1920 only - May 2 2:00 1:00 D 1013Rule Toronto 1920 only - Sep 26 0:00 0 S 1014Rule Toronto 1921 only - May 15 2:00 1:00 D 1015Rule Toronto 1921 only - Sep 15 2:00 0 S 1016Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1017# Shanks says 1923-09-19; assume it's a typo and that "-16" was meant. 1018Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1019Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1020# The 1927-to-1939 rules can be expressed more simply as 1021# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1022# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1023# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1024# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1025# The rules below avoid use of Sun>=25 1026# (which pre-2004 versions of zic cannot handle). 1027Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1028Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1029Rule Toronto 1932 only - May 1 2:00 1:00 D 1030Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1031Rule Toronto 1933 only - Oct 1 2:00 0 S 1032Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1033Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1034Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1035Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1036Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1037Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1038Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1039Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1040Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1041# Shanks says Toronto ended DST a week early in 1971, namely on 1971-10-24, 1042# but Mark Brader wrote (2003-05-31) that he checked the 1971-10-30 issue 1043# of the Toronto Star, and it said that DST ended 1971-10-31 as usual. 1044Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1045 1046# From Paul Eggert (2003-07-27): 1047# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1048# Port Arthur, Ontario, the principle of the Bill has been in 1049# operation for the past three years, and in the City of Moose Jaw, 1050# Saskatchewan, for one year." 1051 1052# From David Bryan via Tory Tronrud, Director/Curator, 1053# Thunder Bay Museum (2003-11-12): 1054# There is some suggestion, however, that, by-law or not, daylight 1055# savings time was being practiced in Fort William and Port Arthur 1056# before 1909.... [I]n 1910, the line between the Eastern and Central 1057# Time Zones was permanently moved about two hundred miles west to 1058# include the Thunder Bay area.... When Canada adopted daylight 1059# savings time in 1916, Fort William and Port Arthur, having done so 1060# already, did not change their clocks.... During the Second World 1061# War,... [t]he cities agreed to implement DST during the summer 1062# months for the remainder of the war years. 1063 1064# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1065Zone America/Montreal -4:54:16 - LMT 1884 1066 -5:00 Mont E%sT 1918 1067 -5:00 Canada E%sT 1919 1068 -5:00 Mont E%sT 1942 Feb 9 2:00s 1069 -5:00 Canada E%sT 1946 1070 -5:00 Mont E%sT 1974 1071 -5:00 Canada E%sT 1072Zone America/Toronto -5:17:32 - LMT 1895 1073 -5:00 Canada E%sT 1919 1074 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1075 -5:00 Canada E%sT 1946 1076 -5:00 Toronto E%sT 1974 1077 -5:00 Canada E%sT 1078Zone America/Thunder_Bay -5:57:00 - LMT 1895 1079 -6:00 - CST 1910 1080 -5:00 - EST 1942 1081 -5:00 Canada E%sT 1970 1082 -5:00 Mont E%sT 1973 1083 -5:00 - EST 1974 1084 -5:00 Canada E%sT 1085Zone America/Nipigon -5:53:04 - LMT 1895 1086 -5:00 Canada E%sT 1940 Sep 29 1087 -5:00 1:00 EDT 1942 Feb 9 2:00s 1088 -5:00 Canada E%sT 1089Zone America/Rainy_River -6:17:56 - LMT 1895 1090 -6:00 Canada C%sT 1940 Sep 29 1091 -6:00 1:00 CDT 1942 Feb 9 2:00s 1092 -6:00 Canada C%sT 1093 1094 1095# Manitoba 1096 1097# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1098Rule Winn 1916 only - Apr 23 0:00 1:00 D 1099Rule Winn 1916 only - Sep 17 0:00 0 S 1100Rule Winn 1918 only - Apr 14 2:00 1:00 D 1101Rule Winn 1918 only - Oct 31 2:00 0 S 1102Rule Winn 1937 only - May 16 2:00 1:00 D 1103Rule Winn 1937 only - Sep 26 2:00 0 S 1104Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1105Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1106Rule Winn 1945 only - Sep lastSun 2:00 0 S 1107Rule Winn 1946 only - May 12 2:00 1:00 D 1108Rule Winn 1946 only - Oct 13 2:00 0 S 1109Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1110Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1111Rule Winn 1950 only - May 1 2:00 1:00 D 1112Rule Winn 1950 only - Sep 30 2:00 0 S 1113Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1114Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1115Rule Winn 1959 only - Oct lastSun 2:00 0 S 1116Rule Winn 1960 only - Sep lastSun 2:00 0 S 1117Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1118Rule Winn 1963 only - Sep 22 2:00 0 S 1119Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 1120Rule Winn 1966 1986 - Oct lastSun 2:00 0 S 1121Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 1122# From Paul Eggert (2000-10-02): 1123# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from 1124# DST at 03:00 local time. For now, assume it started in 1987. 1125Rule Winn 1987 max - Oct lastSun 2:00s 0 S 1126# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1127Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1128 -6:00 Winn C%sT 1129 1130 1131# Saskatchewan 1132 1133# From Mark Brader (2003-07-26): 1134# The first actual adoption of DST in Canada was at the municipal 1135# level. As the [Toronto] Star put it (1912-06-07), "While people 1136# elsewhere have long been talking of legislation to save daylight, 1137# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1138# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1139# presumably late evening, as below), and would run until "the end of 1140# the summer". The discrepancy between municipal time and railroad 1141# time was noted. 1142 1143# From Paul Eggert (2003-07-27): 1144# Willett (1914-03) notes that DST "has been in operation ... in the 1145# City of Moose Jaw, Saskatchewan, for one year." 1146 1147# From Paul Eggert (2000-10-02): 1148# Shanks writes that since 1970 most of this region has been like Regina. 1149# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1150# Other western towns (e.g. Lloydminster) are like Edmonton. 1151# Matthews and Vincent (1998) write that Denare Beach and Creighton 1152# are like Winnipeg, in violation of Saskatchewan law. 1153 1154# From W. Jones <jones@skdad.usask.ca> (1992-11-06): 1155# The. . .below is based on information I got from our law library, the 1156# provincial archives, and the provincial Community Services department. 1157# A precise history would require digging through newspaper archives, and 1158# since you didn't say what you wanted, I didn't bother. 1159# 1160# Saskatchewan is split by a time zone meridian (105W) and over the years 1161# the boundary became pretty ragged as communities near it reevaluated 1162# their affiliations in one direction or the other. In 1965 a provincial 1163# referendum favoured legislating common time practices. 1164# 1165# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1166# Saskatchewan 1978) was proclaimed, and established that the eastern 1167# part of Saskatchewan would use CST year round, that districts in 1168# northwest Saskatchewan would by default follow CST but could opt to 1169# follow Mountain Time rules (thus 1 hour difference in the winter and 1170# zero in the summer), and that districts in southwest Saskatchewan would 1171# by default follow MT but could opt to follow CST. 1172# 1173# It took a few years for the dust to settle (I know one story of a town 1174# on one time zone having its school in another, such that a mom had to 1175# serve her family lunch in two shifts), but presently it seems that only 1176# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1177# rules any more; all other districts appear to have used CST year round 1178# since sometime in the 1960s. 1179 1180# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1181Rule Regina 1918 only - Apr 14 2:00 1:00 D 1182Rule Regina 1918 only - Oct 31 2:00 0 S 1183Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1184Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1185Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1186Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1187Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1188Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1189Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1190Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1191Rule Regina 1945 only - Sep lastSun 2:00 0 S 1192Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1193Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1194Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1195Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1196Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1197Rule Regina 1959 only - Oct lastSun 2:00 0 S 1198# 1199Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1200Rule Swift 1957 only - Oct lastSun 2:00 0 S 1201Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1202Rule Swift 1959 only - Oct lastSun 2:00 0 S 1203Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1204# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1205Zone America/Regina -6:58:36 - LMT 1905 Sep 1206 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1207 -6:00 - CST 1208Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1209 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1210 -7:00 Regina M%sT 1950 1211 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1212 -6:00 - CST 1213 1214 1215# Alberta 1216 1217# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1218Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1219Rule Edm 1918 only - Oct 31 2:00 0 S 1220Rule Edm 1919 only - May 27 2:00 0 S 1221Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1222Rule Edm 1920 only - Oct lastSun 2:00 0 S 1223Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1224Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1225Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1226Rule Edm 1945 only - Sep lastSun 2:00 0 S 1227Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1228Rule Edm 1947 only - Sep lastSun 2:00 0 S 1229Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1230Rule Edm 1967 only - Oct lastSun 2:00 0 S 1231Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1232Rule Edm 1969 only - Oct lastSun 2:00 0 S 1233Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1234Rule Edm 1972 max - Oct lastSun 2:00 0 S 1235Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 1236# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1237Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1238 -7:00 Edm M%sT 1239 1240 1241# British Columbia 1242 1243# From Paul Eggert (2000-10-02): 1244# Shanks writes that since 1970 most of this region has been like Vancouver. 1245# Dawson Creek uses MST. Much of east BC is like Edmonton. 1246# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1247 1248# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1249Rule Vanc 1918 only - Apr 14 2:00 1:00 D 1250Rule Vanc 1918 only - Oct 31 2:00 0 S 1251Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 1252Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 1253Rule Vanc 1945 only - Sep 30 2:00 0 S 1254Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 1255Rule Vanc 1946 only - Oct 13 2:00 0 S 1256Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 1257Rule Vanc 1962 max - Oct lastSun 2:00 0 S 1258Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 1259# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1260Zone America/Vancouver -8:12:28 - LMT 1884 1261 -8:00 Vanc P%sT 1262Zone America/Dawson_Creek -8:00:56 - LMT 1884 1263 -8:00 Canada P%sT 1947 1264 -8:00 Vanc P%sT 1972 Aug 30 2:00 1265 -7:00 - MST 1266 1267 1268# Northwest Territories, Nunavut, Yukon 1269 1270# From Paul Eggert (1999-10-29): 1271# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 1272# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs: 1273# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 1274# c. 7 defines Yukon standard time as UTC-9. This is still valid; 1275# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 1276# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 1277# * O.I.C. 1980/02 established DST. 1278# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 1279# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 1280 1281# From Rives McDow (1999-09-04): 1282# Nunavut ... moved ... to incorporate the whole territory into one time zone. 1283# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 1284# Nunavut moves to single time zone Oct. 31 1285# </a> 1286# 1287# From Antoine Leca (1999-09-06): 1288# We then need to create a new timezone for the Kitikmeot region of Nunavut 1289# to differentiate it from the Yellowknife region. 1290 1291# From Paul Eggert (1999-09-20): 1292# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 1293# Basic Facts: The New Territory 1294# </a> (1999) reports that Pangnirtung operates on eastern time, 1295# and that Coral Harbour does not observe DST. We don't know when 1296# Pangnirtung switched to eastern time; we'll guess 1995. 1297# We'll ignore the claim about Coral Harbour for now, 1298# since we have no further info. 1299 1300# From Rives McDow (1999-11-08): 1301# On October 31, when the rest of Nunavut went to Central time, 1302# Pangnirtung wobbled. Here is the result of their wobble: 1303# 1304# The following businesses and organizations in Pangnirtung use Central Time: 1305# 1306# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 1307# Eastern Arctic National Parks, A & D Specialist 1308# 1309# The following businesses and organizations in Pangnirtung use Eastern Time: 1310# 1311# Hamlet office, All other businesses, Both schools, Airport operator 1312# 1313# This has made for an interesting situation there, which warranted the news. 1314# No one there that I spoke with seems concerned, or has plans to 1315# change the local methods of keeping time, as it evidently does not 1316# really interfere with any activities or make things difficult locally. 1317# They plan to celebrate New Year's turn-over twice, one hour apart, 1318# so it appears that the situation will last at least that long. 1319# The Nunavut Intergovernmental Affairs hopes that they will "come to 1320# their senses", but the locals evidently don't see any problem with 1321# the current state of affairs. 1322 1323# From Michaela Rodrigue, writing in the 1324# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 1325# Nunatsiaq News (1999-11-19)</a>: 1326# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 1327# central - or Nunavut time - for government offices, and eastern time 1328# for municipal offices and schools.... Igloolik [was similar but then] 1329# made the switch to central time on Saturday, Nov. 6. 1330 1331# From Paul Eggert (2000-10-02): 1332# Matthews and Vincent (1998) say the following, but we lack histories 1333# for these potential new Zones. 1334# 1335# The Canadian Forces station at Alert uses Eastern Time while the 1336# handful of residents at the Eureka weather station [in the Central 1337# zone] skip daylight savings. Baffin Island, which is crossed by the 1338# Central, Eastern and Atlantic Time zones only uses Eastern Time. 1339# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 1340# Central Time and Southampton Island [in the Central zone] is not 1341# required to use daylight savings. 1342 1343# From 1344# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> 1345# Nunavut now has two time zones 1346# </a> (2000-11-10): 1347# The Nunavut government would allow its employees in Kugluktuk and 1348# Cambridge Bay to operate on central time year-round, putting them 1349# one hour behind the rest of Nunavut for six months during the winter. 1350# At the end of October the two communities had rebelled against 1351# Nunavut's unified time zone, refusing to shift to eastern time with 1352# the rest of the territory for the winter. Cambridge Bay remained on 1353# central time, while Kugluktuk, even farther west, reverted to 1354# mountain time, which they had used before the advent of Nunavut's 1355# unified time zone in 1999. 1356# 1357# From Rives McDow (2001-01-20), quoting the Nunavut government: 1358# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 1359 1360# From Paul Eggert (2000-12-04): 1361# Let's just keep track of the official times for now. 1362 1363# From Rives McDow (2001-03-07): 1364# The premier of Nunavut has issued a ministerial statement advising 1365# that effective 2001-04-01, the territory of Nunavut will revert 1366# back to three time zones (mountain, central, and eastern). Of the 1367# cities in Nunavut, Coral Harbor is the only one that I know of that 1368# has said it will not observe dst, staying on EST year round. I'm 1369# checking for more info, and will get back to you if I come up with 1370# more. 1371# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 1372 1373# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1374Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 1375Rule NT_YK 1918 only - Oct 27 2:00 0 S 1376Rule NT_YK 1919 only - May 25 2:00 1:00 D 1377Rule NT_YK 1919 only - Nov 1 0:00 0 S 1378Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 1379Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 1380Rule NT_YK 1945 only - Sep 30 2:00 0 S 1381Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 1382Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 1383Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 1384Rule NT_YK 1980 max - Oct lastSun 2:00 0 S 1385Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 1386# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1387Zone America/Pangnirtung -4:22:56 - LMT 1884 1388 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 1389 -5:00 Canada E%sT 1999 Oct 31 2:00 1390 -6:00 Canada C%sT 2000 Oct 29 2:00 1391 -5:00 Canada E%sT 1392Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 1393 -5:00 NT_YK E%sT 1999 Oct 31 2:00 1394 -6:00 Canada C%sT 2000 Oct 29 2:00 1395 -5:00 Canada E%sT 1396Zone America/Rankin_Inlet -6:08:40 - LMT 1884 1397 -6:00 NT_YK C%sT 2000 Oct 29 2:00 1398 -5:00 - EST 2001 Apr 1 3:00 1399 -6:00 Canada C%sT 1400Zone America/Cambridge_Bay -7:00:20 - LMT 1884 1401 -7:00 NT_YK M%sT 1999 Oct 31 2:00 1402 -6:00 Canada C%sT 2000 Oct 29 2:00 1403 -5:00 - EST 2000 Nov 5 0:00 1404 -6:00 - CST 2001 Apr 1 3:00 1405 -7:00 Canada M%sT 1406Zone America/Yellowknife -7:37:24 - LMT 1884 1407 -7:00 NT_YK M%sT 1408Zone America/Inuvik -8:54:00 - LMT 1884 1409 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 1410 -7:00 NT_YK M%sT 1411Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 1412 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 1413 -8:00 NT_YK P%sT 1414Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 1415 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 1416 -8:00 NT_YK P%sT 1417 1418 1419############################################################################### 1420 1421# Mexico 1422 1423# From Paul Eggert (2001-03-05): 1424# The Investigation and Analysis Service of the 1425# Mexican Library of Congress (MLoC) has published a 1426# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> 1427# history of Mexican local time (in Spanish) 1428# </a>. 1429# 1430# Here are the discrepancies between Shanks and the MLoC. 1431# (In all cases we go with the MLoC.) 1432# Shanks reports that Baja was at -8:00 in 1922/1923. 1433# Shanks says the 1930 transition in Baja was 1930-11-16. 1434# Shanks reports no DST during summer 1931. 1435# Shanks reports a transition at 1932-03-30 23:00, not 1932-04-01. 1436# Shanks does not report transitions for Baja in 1945 or 1948. 1437# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23. 1438# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00 1439# on 1997-10-26 at 02:00. 1440 1441# From Gwillim Law (2001-02-20): 1442# There are some other discrepancies between the Decrees page and the 1443# tz database. I think they can best be explained by supposing that 1444# the researchers who prepared the Decrees page failed to find some of 1445# the relevant documents. 1446 1447# From Paul Eggert (2000-07-26): 1448# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 1449# and 1988 DST experiments. Go with spin.com.mx. 1450 1451# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15): 1452# A guy from our Mexico subsidiary finally found the Presidential Decree 1453# outlining the timezone changes in Mexico. 1454# 1455# ------------- Begin Forwarded Message ------------- 1456# 1457# I finally got my hands on the Official Presidential Decree that sets up the 1458# rules for the DST changes. The rules are: 1459# 1460# 1. The country is divided in 3 timezones: 1461# - Baja California Norte (the Mexico/BajaNorte TZ) 1462# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 1463# - The rest of the country (the Mexico/General TZ) 1464# 1465# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 1466# at 2:00 AM, the times in each zone are as follows: 1467# BajaNorte: GMT+7 1468# BajaSur: GMT+6 1469# General: GMT+5 1470# 1471# 3. The rest of the year, the times are as follows: 1472# BajaNorte: GMT+8 1473# BajaSur: GMT+7 1474# General: GMT+6 1475# 1476# The Decree was published in Mexico's Official Newspaper on January 4th. 1477# 1478# -------------- End Forwarded Message -------------- 1479# From Paul Eggert (1996-06-12): 1480# For an English translation of the decree, see 1481# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 1482# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 1483# </a> 1484 1485# From Rives McDow (1998-10-08): 1486# The State of Quintana Roo has reverted back to central STD and DST times 1487# (i.e. UTC -0600 and -0500 as of 1998-08-02). 1488 1489# From Rives McDow (2000-01-10): 1490# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 1491# zone 5 hours from the International Date Line, and will not observe daylight 1492# savings time so as to stay on the same time zone as the southern part of 1493# Arizona year round. 1494 1495# From Jesper Norgaard, translating 1496# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 1497# In Oaxaca, the 55.000 teachers from the Section 22 of the National 1498# Syndicate of Education Workers, refuse to apply daylight saving each 1499# year, so that the more than 10,000 schools work at normal hour the 1500# whole year. 1501 1502# From Gwillim Law (2001-01-19): 1503# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 1504# (translated):... 1505# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 1506# that Summer Time will be reduced from seven to five months, starting 1507# this year.... 1508# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> 1509# [translated], says "summer time will ... take effect on the first Sunday 1510# in May, and end on the last Sunday of September. 1511 1512# From Arthur David Olson (2001-01-25): 1513# The 2001-01-24 traditional Washington Post contained the page one 1514# story "Timely Issue Divides Mexicans."... 1515# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 1516# ... Mexico City Mayor Lopez Obrador "...is threatening to keep 1517# Mexico City and its 20 million residents on a different time than 1518# the rest of the country..." In particular, Lopez Obrador would abolish 1519# observation of Daylight Saving Time. 1520 1521# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> 1522# Official statute published by the Energy Department 1523# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 1524# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). 1525 1526# From Paul Eggert (2001-03-03): 1527# 1528# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> 1529# James F. Smith writes in today's LA Times 1530# </a> 1531# * Sonora will continue to observe standard time. 1532# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that 1533# the Federal District will not adopt DST. 1534# * 4 of 16 district leaders announced they'll ignore the decree. 1535# * The decree does not affect federal-controlled facilities including 1536# the airport, banks, hospitals, and schools. 1537# 1538# For now we'll assume that the Federal District will bow to federal rules. 1539 1540# From Jesper Norgaard (2001-04-01): 1541# I found some references to the Mexican application of daylight 1542# saving, which modifies what I had already sent you, stating earlier 1543# that a number of northern Mexican states would go on daylight 1544# saving. The modification reverts this to only cover Baja California 1545# (Norte), while all other states (except Sonora, who has no daylight 1546# saving all year) will follow the original decree of president 1547# Vicente Fox, starting daylight saving May 6, 2001 and ending 1548# September 30, 2001. 1549# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> 1550# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 1551 1552# From Reuters (2001-09-04): 1553# Mexico's Supreme Court on Tuesday declared that daylight savings was 1554# unconstitutional in Mexico City, creating the possibility the 1555# capital will be in a different time zone from the rest of the nation 1556# next year.... The Supreme Court's ruling takes effect at 2:00 1557# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 1558# standard time. "This is so residents of the Federal District are not 1559# subject to unexpected time changes," a statement from the court said. 1560 1561# From Jesper Norgaard Welen (2002-03-12): 1562# ... consulting my local grocery store(!) and my coworkers, they all insisted 1563# that a new decision had been made to reinstate US style DST in Mexico.... 1564# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 1565# confirms this. Sonora as usual is the only state where DST is not applied. 1566 1567# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1568Rule Mexico 1939 only - Feb 5 0:00 1:00 D 1569Rule Mexico 1939 only - Jun 25 0:00 0 S 1570Rule Mexico 1940 only - Dec 9 0:00 1:00 D 1571Rule Mexico 1941 only - Apr 1 0:00 0 S 1572Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 1573Rule Mexico 1944 only - May 1 0:00 0 S 1574Rule Mexico 1950 only - Feb 12 0:00 1:00 D 1575Rule Mexico 1950 only - Jul 30 0:00 0 S 1576Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 1577Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 1578Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 1579Rule Mexico 2001 only - Sep lastSun 2:00 0 S 1580Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 1581Rule Mexico 2002 max - Oct lastSun 2:00 0 S 1582# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1583# Quintana Roo 1584Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 1585 -6:00 - CST 1981 Dec 23 1586 -5:00 Mexico E%sT 1998 Aug 2 2:00 1587 -6:00 Mexico C%sT 1588# Campeche, Yucatan 1589Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 1590 -6:00 - CST 1981 Dec 23 1591 -5:00 - EST 1982 Dec 2 1592 -6:00 Mexico C%sT 1593# Coahuila, Durango, Nuevo Leon, Tamaulipas 1594Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 1595 -6:00 - CST 1988 1596 -6:00 US C%sT 1989 1597 -6:00 Mexico C%sT 1598# Central Mexico 1599Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 1600 -7:00 - MST 1927 Jun 10 23:00 1601 -6:00 - CST 1930 Nov 15 1602 -7:00 - MST 1931 May 1 23:00 1603 -6:00 - CST 1931 Oct 1604 -7:00 - MST 1932 Apr 1 1605 -6:00 Mexico C%sT 2001 Sep 30 02:00 1606 -6:00 - CST 2002 Feb 20 1607 -6:00 Mexico C%sT 1608# Chihuahua 1609Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 1610 -7:00 - MST 1927 Jun 10 23:00 1611 -6:00 - CST 1930 Nov 15 1612 -7:00 - MST 1931 May 1 23:00 1613 -6:00 - CST 1931 Oct 1614 -7:00 - MST 1932 Apr 1 1615 -6:00 - CST 1996 1616 -6:00 Mexico C%sT 1998 1617 -6:00 - CST 1998 Apr Sun>=1 3:00 1618 -7:00 Mexico M%sT 1619# Sonora 1620Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 1621 -7:00 - MST 1927 Jun 10 23:00 1622 -6:00 - CST 1930 Nov 15 1623 -7:00 - MST 1931 May 1 23:00 1624 -6:00 - CST 1931 Oct 1625 -7:00 - MST 1932 Apr 1 1626 -6:00 - CST 1942 Apr 24 1627 -7:00 - MST 1949 Jan 14 1628 -8:00 - PST 1970 1629 -7:00 Mexico M%sT 1999 1630 -7:00 - MST 1631# Baja California Sur, Nayarit, Sinaloa 1632Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 1633 -7:00 - MST 1927 Jun 10 23:00 1634 -6:00 - CST 1930 Nov 15 1635 -7:00 - MST 1931 May 1 23:00 1636 -6:00 - CST 1931 Oct 1637 -7:00 - MST 1932 Apr 1 1638 -6:00 - CST 1942 Apr 24 1639 -7:00 - MST 1949 Jan 14 1640 -8:00 - PST 1970 1641 -7:00 Mexico M%sT 1642# Baja California 1643Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 1644 -7:00 - MST 1924 1645 -8:00 - PST 1927 Jun 10 23:00 1646 -7:00 - MST 1930 Nov 15 1647 -8:00 - PST 1931 Apr 1 1648 -8:00 1:00 PDT 1931 Sep 30 1649 -8:00 - PST 1942 Apr 24 1650 -8:00 1:00 PWT 1945 Nov 12 1651 -8:00 - PST 1948 Apr 5 1652 -8:00 1:00 PDT 1949 Jan 14 1653 -8:00 - PST 1954 1654 -8:00 CA P%sT 1961 1655 -8:00 - PST 1976 1656 -8:00 US P%sT 1996 1657 -8:00 Mexico P%sT 2001 1658 -8:00 US P%sT 2002 Feb 20 1659 -8:00 Mexico P%sT 1660# From Paul Eggert (2001-03-05): 1661# Formerly there was an America/Ensenada zone, which differed from 1662# America/Tijuana only in that it did not observe DST from 1976 1663# through 1995. This was as per Shanks. However, Guy Harris reports 1664# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and 1665# Tijuana observe DST," which contradicts Shanks but does imply that 1666# DST-observance was a town-by-town matter back then. This concerns 1667# data after 1970 so most likely there should be at least one Zone 1668# other than America/Tijuana for Baja, but it's not clear yet what its 1669# name or contents should be. 1670# 1671# Revillagigedo Is 1672# no information 1673 1674############################################################################### 1675 1676# Anguilla 1677# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1678Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 1679 -4:00 - AST 1680 1681# Antigua and Barbuda 1682# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1683Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 1684 -5:00 - EST 1951 1685 -4:00 - AST 1686 1687# Bahamas 1688# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1689Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 1690Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 1691Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 1692# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1693Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 1694 -5:00 Bahamas E%sT 1695 1696# Barbados 1697# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1698Rule Barb 1977 only - Jun 12 2:00 1:00 D 1699Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1700Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1701Rule Barb 1979 only - Sep 30 2:00 0 S 1702Rule Barb 1980 only - Sep 25 2:00 0 S 1703# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1704Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1705 -3:58:28 - BMT 1932 # Bridgetown Mean Time 1706 -4:00 Barb A%sT 1707 1708# Belize 1709# Whitman entirely disagrees with Shanks; go with Shanks. 1710# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1711Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1712Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1713Rule Belize 1973 only - Dec 5 0:00 1:00 D 1714Rule Belize 1974 only - Feb 9 0:00 0 S 1715Rule Belize 1982 only - Dec 18 0:00 1:00 D 1716Rule Belize 1983 only - Feb 12 0:00 0 S 1717# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1718Zone America/Belize -5:52:48 - LMT 1912 Apr 1719 -6:00 Belize C%sT 1720 1721# Bermuda 1722# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1723Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1724 -4:00 - AST 1974 Apr 28 2:00 1725 -4:00 Bahamas A%sT 1726 1727# Cayman Is 1728# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1729Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1730 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1731 -5:00 - EST 1732 1733# Costa Rica 1734# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1735Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1736Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1737Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 1738# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 1739Rule CR 1991 only - Jul 1 0:00 0 S 1740Rule CR 1992 only - Mar 15 0:00 0 S 1741# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1742# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1743Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1744 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 1745 -6:00 CR C%sT 1746# Coco 1747# no information; probably like America/Costa_Rica 1748 1749# Cuba 1750 1751# From Arthur David Olson (1999-03-29): 1752# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 1753# the Cuban National Team and the Baltimore Orioles was carried live on 1754# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 1755# During the game, play-by-play announcer Jim Hunter noted that 1756# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 1757# Time today." (The "two hour" remark referred to losing one hour of 1758# sleep on 1999-03-28--when the announcers were in Cuba as it switched 1759# to DST--and one more hour on 1999-04-04--when the announcers will have 1760# returned to Baltimore, which switches on that date.) 1761 1762# From Evert van der Veer via Steffen Thorsen (2004-10-28): 1763# Cuba is not going back to standard time this year. 1764# From Paul Eggert (2004-10-28): 1765# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 1766# says that it's due to a problem at the Antonio Guiteras 1767# thermoelectric plant, and says "This October there will be no return 1768# to normal hours (after daylight saving time)". 1769# For now, let's assume that it's a one-year temporary measure. 1770 1771# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1772Rule Cuba 1928 only - Jun 10 0:00 1:00 D 1773Rule Cuba 1928 only - Oct 10 0:00 0 S 1774Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 1775Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 1776Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 1777Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 1778Rule Cuba 1965 only - Jun 1 0:00 1:00 D 1779Rule Cuba 1965 only - Sep 30 0:00 0 S 1780Rule Cuba 1966 only - May 29 0:00 1:00 D 1781Rule Cuba 1966 only - Oct 2 0:00 0 S 1782Rule Cuba 1967 only - Apr 8 0:00 1:00 D 1783Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 1784Rule Cuba 1968 only - Apr 14 0:00 1:00 D 1785Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 1786Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 1787Rule Cuba 1972 1974 - Oct 8 0:00 0 S 1788Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 1789Rule Cuba 1978 only - May 7 0:00 1:00 D 1790Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 1791Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 1792Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 1793Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 1794Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 1795Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 1796Rule Cuba 1996 only - Oct 6 0:00s 0 S 1797Rule Cuba 1997 only - Oct 12 0:00s 0 S 1798Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 1799Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 1800Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D 1801Rule Cuba 2005 max - Oct lastSun 0:00s 0 S 1802 1803# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1804Zone America/Havana -5:29:28 - LMT 1890 1805 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 1806 -5:00 Cuba C%sT 1807 1808# Dominica 1809# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1810Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 1811 -4:00 - AST 1812 1813# Dominican Republic 1814 1815# From Steffen Thorsen (2000-10-30): 1816# Enrique Morales reported to me that the Dominican Republic has changed the 1817# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 1818# http://www.listin.com.do/antes/261000/republica/princi.html 1819 1820# From Paul Eggert (2000-12-04): 1821# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 1822 1823# From Rives McDow (2000-12-01): 1824# Dominican Republic changed its mind and presidential decree on Tuesday, 1825# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 1826# Dominican Republic will be reverting to 8 hours from the International Date 1827# Line, and will not be using DST in the foreseeable future. The reason they 1828# decided to use DST was to be in synch with Puerto Rico, who was also going 1829# to implement DST. When Puerto Rico didn't implement DST, the president 1830# decided to revert. 1831 1832 1833# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1834Rule DR 1966 only - Oct 30 0:00 1:00 D 1835Rule DR 1967 only - Feb 28 0:00 0 S 1836Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 1837Rule DR 1970 only - Feb 21 0:00 0 S 1838Rule DR 1971 only - Jan 20 0:00 0 S 1839Rule DR 1972 1974 - Jan 21 0:00 0 S 1840# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1841Zone America/Santo_Domingo -4:39:36 - LMT 1890 1842 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 1843 -5:00 DR E%sT 1974 Oct 27 1844 -4:00 - AST 2000 Oct 29 02:00 1845 -5:00 US E%sT 2000 Dec 3 01:00 1846 -4:00 - AST 1847 1848# El Salvador 1849# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1850Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 1851Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 1852# There are too many San Salvadors elsewhere, so use America/El_Salvador 1853# instead of America/San_Salvador. 1854# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1855Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 1856 -6:00 Salv C%sT 1857 1858# Grenada 1859# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1860Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 1861 -4:00 - AST 1862 1863# Guadeloupe 1864# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1865Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 1866 -4:00 - AST 1867 1868# Guatemala 1869# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1870Rule Guat 1973 only - Nov 25 0:00 1:00 D 1871Rule Guat 1974 only - Feb 24 0:00 0 S 1872Rule Guat 1983 only - May 21 0:00 1:00 D 1873Rule Guat 1983 only - Sep 22 0:00 0 S 1874Rule Guat 1991 only - Mar 23 0:00 1:00 D 1875Rule Guat 1991 only - Sep 7 0:00 0 S 1876# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1877Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 1878 -6:00 Guat C%sT 1879 1880# Haiti 1881# From Gwillim Law (2005-04-15): 1882# Risto O. Nykanen wrote me that Haiti is now on DST. 1883# I searched for confirmation, and I found a 1884# <a href="http://www.haitianconsulate.org/time.doc"> press release 1885# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 1886# </a>. Translated from French, it says: 1887# 1888# "The Prime Minister's Communication Office notifies the public in general 1889# and the press in particular that, following a decision of the Interior 1890# Ministry and the Territorial Collectivities [I suppose that means the 1891# provinces], Haiti will move to Eastern Daylight Time in the night from next 1892# Saturday the 2nd to Sunday the 3rd. 1893# 1894# "Consequently, the Prime Minister's Communication Office wishes to inform 1895# the population that the country's clocks will be set forward one hour 1896# starting at midnight. This provision will hold until the last Saturday in 1897# October 2005. 1898# 1899# "Port-au-Prince, March 31, 2005" 1900 1901# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1902Rule Haiti 1983 only - May 8 0:00 1:00 D 1903Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 1904Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 1905# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA. 1906Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 1907Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 1908Rule Haiti 2005 only - Apr Sun>=1 0:00 1:00 D 1909Rule Haiti 2005 only - Oct lastSun 0:00 0 S 1910# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1911Zone America/Port-au-Prince -4:49:20 - LMT 1890 1912 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 1913 -5:00 Haiti E%sT 1914 1915# Honduras 1916# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 1917# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1918Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 1919 -6:00 Salv C%sT 1920# 1921# Great Swan I ceded by US to Honduras in 1972 1922 1923# Jamaica 1924 1925# From Bob Devine (1988-01-28): 1926# Follows US rules. 1927 1928# From U. S. Naval Observatory (1989-01-19): 1929# JAMAICA 5 H BEHIND UTC 1930 1931# From Shanks: 1932# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1933Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 1934 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1935 -5:00 - EST 1974 Apr 28 2:00 1936 -5:00 US E%sT 1984 1937 -5:00 - EST 1938 1939# Martinique 1940# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1941Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 1942 -4:04:20 - FFMT 1911 May # Fort-de-France MT 1943 -4:00 - AST 1980 Apr 6 1944 -4:00 1:00 ADT 1980 Sep 28 1945 -4:00 - AST 1946 1947# Montserrat 1948# From Paul Eggert (1997-08-31): 1949# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 1950# Luckily, Olveston, the current de facto capital, has the same longitude. 1951# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1952Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 1953 -4:00 - AST 1954 1955# Nicaragua 1956# 1957# From Steffen Thorsen (1998-12-29): 1958# Nicaragua seems to be back at -6:00 but I have not been able to find when 1959# they changed from -5:00. 1960# 1961# From Steffen Thorsen (2005-04-12): 1962# I've got reports from 8 different people that Nicaragua just started 1963# DST on Sunday 2005-04-10, in order to save energy because of 1964# expensive petroleum. The exact end date for DST is not yet 1965# announced, only "September" but some sites also say "mid-September". 1966# Some background information is available on the President's official site: 1967# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 1968# The Decree, no 23-2005 is available here: 1969# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf 1970# 1971# From Paul Eggert (2005-04-12): 1972# The decree doesn't say anything about daylight saving, but for now let's 1973# assume that it is daylight saving and that they'll switch back on the 1974# 2nd Sunday in September. 1975# 1976# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1977Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 1978Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 1979Rule Nic 1992 only - Jan 1 4:00 1:00 D 1980Rule Nic 1992 only - Sep 24 0:00 0 S 1981Rule Nic 2005 only - Apr 10 0:00 1:00 D 1982Rule Nic 2005 only - Sep 11 0:00 0 S 1983# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1984Zone America/Managua -5:45:08 - LMT 1890 1985 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 1986 -6:00 - CST 1973 May 1987 -5:00 - EST 1975 Feb 16 1988 -6:00 Nic C%sT 1993 Jan 1 4:00 1989 -5:00 - EST 1998 Dec 1990 -6:00 Nic C%sT 1991 1992# Panama 1993# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1994Zone America/Panama -5:18:08 - LMT 1890 1995 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time 1996 -5:00 - EST 1997 1998# Puerto Rico 1999# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 2000# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2001Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 2002 -4:00 - AST 1942 May 3 2003 -4:00 1:00 AWT 1945 Sep 30 2:00 2004 -4:00 - AST 2005 2006# St Kitts-Nevis 2007# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2008Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 2009 -4:00 - AST 2010 2011# St Lucia 2012# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2013Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 2014 -4:04:00 - CMT 1912 # Castries Mean Time 2015 -4:00 - AST 2016 2017# St Pierre and Miquelon 2018# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 2019# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2020Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 2021 -4:00 - AST 1980 May 2022 -3:00 - PMST 1987 # Pierre & Miquelon Time 2023 -3:00 Canada PM%sT 2024 2025# St Vincent and the Grenadines 2026# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2027Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 2028 -4:04:56 - KMT 1912 # Kingstown Mean Time 2029 -4:00 - AST 2030 2031# Turks and Caicos 2032# From Paul Eggert (1998-08-06): 2033# Shanks says they use US DST rules, but IATA SSIM (1991/1998) 2034# says they switch at midnight. Go with IATA SSIM. 2035# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2036Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D 2037Rule TC 1979 max - Oct lastSun 0:00 0 S 2038Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D 2039# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2040Zone America/Grand_Turk -4:44:32 - LMT 1890 2041 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 2042 -5:00 TC E%sT 2043 2044# British Virgin Is 2045# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2046Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 2047 -4:00 - AST 2048 2049# Virgin Is 2050# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2051Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 2052 -4:00 - AST 2053