northamerica revision 153670
1275970Scy# @(#)northamerica 7.82 2275970Scy# also includes Central America and the Caribbean 3275970Scy 4275970Scy# This data is by no means authoritative; if you think you know better, 5275970Scy# 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 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# From Arthur David Olson (2005-08-22): 114# Paul has been careful to use the "US" rules only in those locations 115# that are part of the United States; this reflects the real scope of 116# U.S. government action. So even though the "US" rules have changed 117# in the latest release, other countries won't be affected. 118 119# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 120Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 121Rule US 1918 1919 - Oct lastSun 2:00 0 S 122Rule US 1942 only - Feb 9 2:00 1:00 W # War 123Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 124Rule US 1945 only - Sep 30 2:00 0 S 125Rule US 1967 2006 - Oct lastSun 2:00 0 S 126Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 127Rule US 1974 only - Jan 6 2:00 1:00 D 128Rule US 1975 only - Feb 23 2:00 1:00 D 129Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 130Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 131Rule US 2007 max - Mar Sun>=8 2:00 1:00 D 132Rule US 2007 max - Nov Sun>=1 2:00 0 S 133 134# From Bob Devine (1988-01-28): 135# ...Alaska (and Hawaii) had the timezone names changed in 1967. 136# old new 137# Pacific Standard Time(PST) -same- 138# Yukon Standard Time(YST) -same- 139# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 140# Nome Standard Time (NT) Bering Standard Time (BST) 141# 142# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 143# The YST zone now covers nearly all of the state, AHST just part 144# of the Aleutian islands. No DST. 145 146# From Paul Eggert (1995-12-19): 147# The tables below use `NST', not `NT', for Nome Standard Time. 148# I invented `CAWT' for Central Alaska War Time. 149 150# From U. S. Naval Observatory (1989-01-19): 151# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 152# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 153# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 154# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 155# USA MOUNTAIN 7 H BEHIND UTC DENVER 156# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 157# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 158# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 159# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 160# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 161# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 162# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 163# USA HAWAII 10 H BEHIND UTC 164# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 165 166# From Arthur David Olson (1989-01-21): 167# The above dates are for 1988. 168# Note the "AKST" and "AKDT" abbreviations, the claim that there's 169# no DST in Samoa, and the claim that there is DST in Alaska and the 170# Aleutians. 171 172# From Arthur David Olson (1988-02-13): 173# Legal standard time zone names, from United States Code (1982 Edition and 174# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 175# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 176# took effect), as explained in sections 263 and 261: 177# (none) 178# United States standard eastern time 179# United States standard mountain time 180# United States standard central time 181# United States standard Pacific time 182# (none) 183# United States standard Alaska time 184# (none) 185# Next, names from 1967-04-01 until 1983-11-30 (the date for 186# public law 98-181): 187# Atlantic standard time 188# eastern standard time 189# central standard time 190# mountain standard time 191# Pacific standard time 192# Yukon standard time 193# Alaska-Hawaii standard time 194# Bering standard time 195# And after 1983-11-30: 196# Atlantic standard time 197# eastern standard time 198# central standard time 199# mountain standard time 200# Pacific standard time 201# Alaska standard time 202# Hawaii-Aleutian standard time 203# Samoa standard time 204# The law doesn't give abbreviations. 205# 206# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 207# Public law 106-564 (2000-12-23) introduced the abbreviation 208# "Chamorro Standard Time" for time in Guam and the Northern Marianas. 209# See the file "australasia". 210 211# From Arthur David Olson, 2005-08-09 212# The following was signed into law on 2005-08-08. 213# 214# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 215# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15 216# U.S.C. 260a(a)) is amended-- 217# (1) by striking `first Sunday of April' and inserting `second 218# Sunday of March'; and 219# (2) by striking `last Sunday of October' and inserting `first 220# Sunday of November'. 221# (b) Effective Date- Subsection (a) shall take effect 1 year after the 222# date of enactment of this Act or March 1, 2007, whichever is later. 223# (c) Report to Congress- Not later than 9 months after the effective 224# date stated in subsection (b), the Secretary shall report to Congress 225# on the impact of this section on energy consumption in the United 226# States. 227# (d) Right to Revert- Congress retains the right to revert the 228# Daylight Saving Time back to the 2005 time schedules once the 229# Department study is complete. 230 231# US eastern time, represented by New York 232 233# Connecticut, Delaware, District of Columbia, most of Florida, 234# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky 235# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, 236# New Hampshire, New Jersey, New York, North Carolina, Ohio, 237# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 238# Vermont, Virginia, West Virginia 239 240# From Dave Cantor (2004-11-02): 241# Early this summer I had the occasion to visit the Mount Washington 242# Observatory weather station atop (of course!) Mount Washington [, NH].... 243# One of the staff members said that the station was on Eastern Standard Time 244# and didn't change their clocks for Daylight Saving ... so that their 245# reports will always have times which are 5 hours behind UTC. 246 247# From Paul Eggert (2005-08-26): 248# According to today's Huntsville Times 249# <http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1> 250# a few towns on Alabama's "eastern border with Georgia, such as Phenix City 251# in Russell County, Lanett in Chambers County and some towns in Lee County, 252# set their watches and clocks on Eastern time." It quotes H.H. "Bubba" 253# Roberts, city administrator in Phenix City. as saying "We are in the Central 254# time zone, but we do go by the Eastern time zone because so many people work 255# in Columbus." 256 257# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 258Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 259Rule NYC 1920 only - Oct lastSun 2:00 0 S 260Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 261Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 262Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 263# Zone NAME GMTOFF RULES FORMAT [UNTIL] 264Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 265 -5:00 US E%sT 1920 266 -5:00 NYC E%sT 1942 267 -5:00 US E%sT 1946 268 -5:00 NYC E%sT 1967 269 -5:00 US E%sT 270 271# US central time, represented by Chicago 272 273# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 274# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 275# Washington counties), Illinois, western Indiana 276# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 277# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 278# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 279# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 280# western Tennessee, most of Texas, Wisconsin 281 282# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 283Rule Chicago 1920 only - Jun 13 2:00 1:00 D 284Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 285Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 286Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 287Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 288Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 289# Zone NAME GMTOFF RULES FORMAT [UNTIL] 290Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 291 -6:00 US C%sT 1920 292 -6:00 Chicago C%sT 1936 Mar 1 2:00 293 -5:00 - EST 1936 Nov 15 2:00 294 -6:00 Chicago C%sT 1942 295 -6:00 US C%sT 1946 296 -6:00 Chicago C%sT 1967 297 -6:00 US C%sT 298# Oliver County, ND switched from mountain to central time on 1992-10-25. 299Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 300 -7:00 US M%sT 1992 Oct 25 02:00 301 -6:00 US C%sT 302 303# US mountain time, represented by Denver 304# 305# Colorado, far western Kansas, Montana, western 306# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 307# New Mexico, southwestern North Dakota, far eastern Oregon, 308# western South Dakota, far western Texas (El Paso County, Hudspeth County, 309# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 310# 311# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 312Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 313Rule Denver 1920 only - Oct lastSun 2:00 0 S 314Rule Denver 1921 only - May 22 2:00 0 S 315Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 316Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 317# Zone NAME GMTOFF RULES FORMAT [UNTIL] 318Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 319 -7:00 US M%sT 1920 320 -7:00 Denver M%sT 1942 321 -7:00 US M%sT 1946 322 -7:00 Denver M%sT 1967 323 -7:00 US M%sT 324 325# US Pacific time, represented by Los Angeles 326# 327# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 328# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties), 329# most of Nevada, most of Oregon, and Washington 330# 331# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 332Rule CA 1948 only - Mar 14 2:00 1:00 D 333Rule CA 1949 only - Jan 1 2:00 0 S 334Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 335Rule CA 1950 1961 - Sep lastSun 2:00 0 S 336Rule CA 1962 1966 - Oct lastSun 2:00 0 S 337# Zone NAME GMTOFF RULES FORMAT [UNTIL] 338Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 339 -8:00 US P%sT 1946 340 -8:00 CA P%sT 1967 341 -8:00 US P%sT 342 343# Alaska 344# AK%sT is the modern abbreviation for -9:00 per USNO. 345# 346# From Paul Eggert (2001-05-30): 347# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 348# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 349# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 350# also a Friday. Include only the time zone part of this transition, 351# ignoring the switch from Julian to Gregorian, since we can't represent 352# the Julian calendar. 353# 354# As far as we know, none of the exact locations mentioned below were 355# permanently inhabited in 1867 by anyone using either calendar. 356# (Yakutat was colonized by the Russians in 1799, but the settlement 357# was destroyed in 1805 by a Yakutat-kon war party.) However, there 358# were nearby inhabitants in some cases and for our purposes perhaps 359# it's best to simply use the official transition. 360# 361# Zone NAME GMTOFF RULES FORMAT [UNTIL] 362Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 363 -8:57:41 - LMT 1900 Aug 20 12:00 364 -8:00 - PST 1942 365 -8:00 US P%sT 1946 366 -8:00 - PST 1969 367 -8:00 US P%sT 1983 Oct 30 2:00 368 -9:00 US Y%sT 1983 Nov 30 369 -9:00 US AK%sT 370Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 371 -9:18:55 - LMT 1900 Aug 20 12:00 372 -9:00 - YST 1942 373 -9:00 US Y%sT 1946 374 -9:00 - YST 1969 375 -9:00 US Y%sT 1983 Nov 30 376 -9:00 US AK%sT 377Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 378 -9:59:36 - LMT 1900 Aug 20 12:00 379 -10:00 - CAT 1942 380 -10:00 US CAT/CAWT 1946 381 -10:00 - CAT 1967 Apr 382 -10:00 - AHST 1969 383 -10:00 US AH%sT 1983 Oct 30 2:00 384 -9:00 US Y%sT 1983 Nov 30 385 -9:00 US AK%sT 386Zone America/Nome 12:58:21 - LMT 1867 Oct 18 387 -11:01:38 - LMT 1900 Aug 20 12:00 388 -11:00 - NST 1942 389 -11:00 US N%sT 1946 390 -11:00 - NST 1967 Apr 391 -11:00 - BST 1969 392 -11:00 US B%sT 1983 Oct 30 2:00 393 -9:00 US Y%sT 1983 Nov 30 394 -9:00 US AK%sT 395Zone America/Adak 12:13:21 - LMT 1867 Oct 18 396 -11:46:38 - LMT 1900 Aug 20 12:00 397 -11:00 - NST 1942 398 -11:00 US N%sT 1946 399 -11:00 - NST 1967 Apr 400 -11:00 - BST 1969 401 -11:00 US B%sT 1983 Oct 30 2:00 402 -10:00 US AH%sT 1983 Nov 30 403 -10:00 US HA%sT 404# The following switches don't quite make our 1970 cutoff. 405# 406# Shanks writes that part of southwest Alaska (e.g. Aniak) 407# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 408# and another part (e.g. Akiak) made the same switch five weeks later. 409# 410# From David Flater (2004-11-09): 411# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 412# Historic Preservation Commission, provided this information, which 413# suggests that Unalaska deviated from statutory time from early 1967 414# possibly until 1983: 415# 416# Minutes of the Unalaska City Council Meeting, January 10, 1967: 417# "Except for St. Paul and Akutan, Unalaska is the only important 418# location not on Alaska Standard Time. The following resolution was 419# made by William Robinson and seconded by Henry Swanson: Be it 420# resolved that the City of Unalaska hereby goes to Alaska Standard 421# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 422# January 14, Alaska Standard Time.) This resolution was passed with 423# three votes for and one against." 424 425# Hawaii 426# 427# From Arthur David Olson: 428# And then there's Hawaii. 429# DST was observed for one day in 1933; 430# standard time was changed by half an hour in 1947; 431# it's always standard as of 1986. 432# 433# From Paul Eggert: 434# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 435# 436Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 437 -10:30 - HST 1933 Apr 30 2:00 438 -10:30 1:00 HDT 1933 May 21 2:00 439 -10:30 US H%sT 1947 Jun 8 2:00 440 -10:00 - HST 441 442# Now we turn to US areas that have diverged from the consensus since 1970. 443 444# Arizona mostly uses MST. 445 446# From Paul Eggert (2002-10-20): 447# 448# The information in the rest of this paragraph is derived from the 449# <a href="http://www.dlapr.lib.az.us/links/daylight.htm"> 450# Daylight Saving Time web page (2002-01-23)</a> maintained by the 451# Arizona State Library, Archives and Public Records. 452# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 453# time, but by federal law railroads, airlines, bus lines, military 454# personnel, and some engaged in interstate commerce continued to 455# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 456# Gazette says that was the date the law changed, and that 04-01 was 457# the date the state's clocks would change. In 1945 the State of 458# Arizona used standard time all year, again with exceptions only as 459# mandated by federal law. Arizona observed DST in 1967, but Arizona 460# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 461# 462# Shanks says the 1944 experiment came to an end on 1944-03-17. 463# Go with the Arizona State Library instead. 464 465Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 466 -7:00 US M%sT 1944 Jan 1 00:01 467 -7:00 - MST 1944 Apr 1 00:01 468 -7:00 US M%sT 1944 Oct 1 00:01 469 -7:00 - MST 1967 470 -7:00 US M%sT 1968 Mar 21 471 -7:00 - MST 472# From Arthur David Olson (1988-02-13): 473# A writer from the Inter Tribal Council of Arizona, Inc., 474# notes in private correspondence dated 1987-12-28 that "Presently, only the 475# Navajo Nation participates in the Daylight Saving Time policy, due to its 476# large size and location in three states." (The "only" means that other 477# tribal nations don't use DST.) 478 479Link America/Denver America/Shiprock 480 481# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 482# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 483# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 484# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 485# Teton, Twin Falls, Valley, Washington counties) and eastern Oregon 486# switched four weeks late in 1974. 487# 488# Zone NAME GMTOFF RULES FORMAT [UNTIL] 489Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 490 -8:00 US P%sT 1923 May 13 2:00 491 -7:00 US M%sT 1974 492 -7:00 - MST 1974 Feb 3 2:00 493 -7:00 US M%sT 494 495# Indiana 496# 497# For a map of Indiana's time zone regions, see: 498# <a href="http://www.mccsc.edu/time.html"> 499# What time is it in Indiana? 500# </a> (2005-05-03) 501# 502# From Paul Eggert (2005-08-22): 503# Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 504# with the following exceptions: 505# 506# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 507# Vandenburgh, and Warrick counties have been like America/Chicago. 508# 509# - Dearborn and Ohio counties have been like America/New_York. 510# 511# - Clark, Floyd, and Harrison counties have been like 512# America/Kentucky/Louisville. 513# 514# - Crawford, Starke, and Switzerland counties have their own time zone 515# histories as noted below. 516# 517# Shanks partitions Indiana into 345 regions, each with its own time history, 518# and writes ``Even newspaper reports present contradictory information.'' 519# Fortunately, most of the complexity occurred before our cutoff date of 1970. 520# 521# Other than Indianapolis, the Indiana place names are so nondescript 522# that they would be ambiguous if we left them at the `America' level. 523# So we reluctantly put them all in a subdirectory `America/Indiana'. 524 525# From Paul Eggert (2005-08-16): 526# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006, 527# and that many counties may switch either to Central or to Eastern time. 528# The county-by-county decisions have not been made yet, so for now assume 529# that no counties will switch: this assumption is most likely wrong, 530# but it's the best we can do for now. 531 532# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 533Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 534Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 535Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 536# Zone NAME GMTOFF RULES FORMAT [UNTIL] 537Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 538 -6:00 US C%sT 1920 539 -6:00 Indianapolis C%sT 1942 540 -6:00 US C%sT 1946 541 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 542 -5:00 - EST 1957 Sep 29 2:00 543 -6:00 - CST 1958 Apr 27 2:00 544 -5:00 - EST 1969 545 -5:00 US E%sT 1971 546 -5:00 - EST 2006 547 -5:00 US E%sT 548# 549# Part of Crawford County, Indiana, last observed DST in 1975, 550# and left its clocks alone in 1974. 551# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 552Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 553Rule Marengo 1951 only - Sep lastSun 2:00 0 S 554Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 555Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 556# Zone NAME GMTOFF RULES FORMAT [UNTIL] 557Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 558 -6:00 US C%sT 1951 559 -6:00 Marengo C%sT 1961 Apr 30 2:00 560 -5:00 - EST 1969 561 -5:00 US E%sT 1974 Jan 6 2:00 562 -6:00 1:00 CDT 1974 Oct 27 2:00 563 -5:00 US E%sT 1976 564 -5:00 - EST 2006 565 -5:00 US E%sT 566# 567# Starke County, Indiana 568# From Arthur David Olson (1991-10-28): 569# An article on page A3 of the Sunday, 1991-10-27 Washington Post 570# notes that Starke County switched from Central time to Eastern time as of 571# 1991-10-27. 572# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 573Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 574Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 575Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 576Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 577Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 578# Zone NAME GMTOFF RULES FORMAT [UNTIL] 579Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 580 -6:00 US C%sT 1947 581 -6:00 Starke C%sT 1962 Apr 29 2:00 582 -5:00 - EST 1963 Oct 27 2:00 583 -6:00 US C%sT 1991 Oct 27 2:00 584 -5:00 - EST 2006 585 -5:00 US E%sT 586# 587# Switzerland County, Indiana, last observed DST in 1972. 588# Zone NAME GMTOFF RULES FORMAT [UNTIL] 589Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 590 -6:00 US C%sT 1954 Apr 25 2:00 591 -5:00 - EST 1969 592 -5:00 US E%sT 1973 593 -5:00 - EST 2006 594 -5:00 US E%sT 595 596# Part of Kentucky left its clocks alone in 1974. 597# This also includes Clark, Floyd, and Harrison counties in Indiana. 598# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 599Rule Louisville 1921 only - May 1 2:00 1:00 D 600Rule Louisville 1921 only - Sep 1 2:00 0 S 601Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 602Rule Louisville 1941 only - Sep lastSun 2:00 0 S 603Rule Louisville 1946 only - Jun 2 2:00 0 S 604Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 605Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 606# Zone NAME GMTOFF RULES FORMAT [UNTIL] 607Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 608 -6:00 US C%sT 1921 609 -6:00 Louisville C%sT 1942 610 -6:00 US C%sT 1946 611 -6:00 Louisville C%sT 1961 Jul 23 2:00 612 -5:00 - EST 1968 613 -5:00 US E%sT 1974 Jan 6 2:00 614 -6:00 1:00 CDT 1974 Oct 27 2:00 615 -5:00 US E%sT 616# 617# Wayne, Clinton, and Russell Counties, Kentucky 618# 619# From 620# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 621# Lake Cumberland LIFE 622# </a> (1999-01-29) via WKYM-101.7: 623# Clinton County has joined Wayne County in asking the DoT to change from 624# the Central to the Eastern time zone.... The Wayne County government made 625# the same request in December. And while Russell County officials have not 626# taken action, the majority of respondents to a poll conducted there in 627# August indicated they would like to change to "fast time" also. 628# The three Lake Cumberland counties are the farthest east of any U.S. 629# location in the Central time zone. 630# 631# From Rich Wales (2000-08-29): 632# After prolonged debate, and despite continuing deep differences of opinion, 633# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 634# (-0500) time. They won't "fall back" this year. See Sara Shipley, 635# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 636# 637# From Paul Eggert (2001-07-16): 638# The final rule was published in the 639# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> 640# Federal Register 65, 160 (2000-08-17), page 50154-50158. 641# </a> 642# 643Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 644 -6:00 US C%sT 1946 645 -6:00 - CST 1968 646 -6:00 US C%sT 2000 Oct 29 2:00 647 -5:00 US E%sT 648 649 650# From Rives McDow (2000-08-30): 651# Here ... are all the changes in the US since 1985. 652# Kearny County, KS (put all of county on central; 653# previously split between MST and CST) ... 1990-10 654# Starke County, IN (from CST to EST) ... 1991-10 655# Oliver County, ND (from MST to CST) ... 1992-10 656# West Wendover, NV (from PST TO MST) ... 1999-10 657# Wayne County, KY (from CST to EST) ... 2000-10 658# 659# From Paul Eggert (2001-07-17): 660# We don't know where the line used to be within Kearny County, KS, 661# so omit that change for now. 662# See America/Indiana/Knox for the Starke County, IN change. 663# See America/North_Dakota/Center for the Oliver County, ND change. 664# West Wendover, NV officially switched from Pacific to mountain time on 665# 1999-10-31. See the 666# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> 667# Federal Register 64, 203 (1999-10-21), page 56705-56707. 668# </a> 669# However, the Federal Register says that West Wendover already operated 670# on mountain time, and the rule merely made this official; 671# hence a separate tz entry is not needed. 672 673# Michigan 674# 675# From Bob Devine (1988-01-28): 676# Michigan didn't observe DST from 1968 to 1973. 677# 678# From Paul Eggert (1999-03-31): 679# Shanks writes that Michigan started using standard time on 1885-09-18, 680# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 681# that Detroit kept 682# 683# local time until 1900 when the City Council decreed that clocks should 684# be put back twenty-eight minutes to Central Standard Time. Half the 685# city obeyed, half refused. After considerable debate, the decision 686# was rescinded and the city reverted to Sun time. A derisive offer to 687# erect a sundial in front of the city hall was referred to the 688# Committee on Sewers. Then, in 1905, Central time was adopted 689# by city vote. 690# 691# This story is too entertaining to be false, so go with Howse over Shanks. 692# 693# From Paul Eggert (2001-03-06): 694# Garland (1927) writes ``Cleveland and Detroit advanced their clocks 695# one hour in 1914.'' This change is not in Shanks. We have no more 696# info, so omit this for now. 697# 698# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 699# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 700Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 701Rule Detroit 1948 only - Sep lastSun 2:00 0 S 702Rule Detroit 1967 only - Jun 14 2:00 1:00 D 703Rule Detroit 1967 only - Oct lastSun 2:00 0 S 704# Zone NAME GMTOFF RULES FORMAT [UNTIL] 705Zone America/Detroit -5:32:11 - LMT 1905 706 -6:00 - CST 1915 May 15 2:00 707 -5:00 - EST 1942 708 -5:00 US E%sT 1946 709 -5:00 Detroit E%sT 1973 710 -5:00 US E%sT 1975 711 -5:00 - EST 1975 Apr 27 2:00 712 -5:00 US E%sT 713# 714# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 715# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 716Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 717Rule Menominee 1946 only - Sep lastSun 2:00 0 S 718Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 719Rule Menominee 1966 only - Oct lastSun 2:00 0 S 720# Zone NAME GMTOFF RULES FORMAT [UNTIL] 721Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 722 -6:00 US C%sT 1946 723 -6:00 Menominee C%sT 1969 Apr 27 2:00 724 -5:00 - EST 1973 Apr 29 2:00 725 -6:00 US C%sT 726 727# Navassa 728# administered by the US Fish and Wildlife Service 729# claimed by US under the provisions of the 1856 Guano Islands Act 730# also claimed by Haiti 731# occupied 1857/1900 by the Navassa Phosphate Co 732# US lighthouse 1917/1996-09 733# currently uninhabited 734# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 735# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 736# Jimmy Skaggs, _The Great Guano Rush_ (1994). 737 738################################################################################ 739 740 741# From Paul Eggert (1999-10-29): 742# A good source for time zone historical data outside the US is 743# Thomas G. Shanks, The International Atlas (5th edition), 744# San Diego: ACS Publications, Inc. (1999). 745# 746# Gwillim Law writes that a good source 747# for recent time zone data is the International Air Transport 748# Association's Standard Schedules Information Manual (IATA SSIM), 749# published semiannually. Law sent in several helpful summaries 750# of the IATA's data after 1990. 751# 752# Except where otherwise noted, Shanks is the source for entries through 1990, 753# and IATA SSIM is the source for entries after 1990. 754# 755# Other sources occasionally used include: 756# 757# Edward W. Whitman, World Time Differences, 758# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 759# which I found in the UCLA library. 760# 761# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf"> 762# William Willett, The Waste of Daylight, 19th edition 763# </a> (1914-03) 764# 765# See the `europe' file for Greenland. 766 767# Canada 768 769# From Alain LaBont<e'> (1994-11-14): 770# I post here the time zone abbreviations standardized in Canada 771# for both English and French in the CAN/CSA-Z234.4-89 standard.... 772# 773# UTC Standard time Daylight savings time 774# offset French English French English 775# -2:30 - - HAT NDT 776# -3 - - HAA ADT 777# -3:30 HNT NST - - 778# -4 HNA AST HAE EDT 779# -5 HNE EST HAC CDT 780# -6 HNC CST HAR MDT 781# -7 HNR MST HAP PDT 782# -8 HNP PST HAY YDT 783# -9 HNY YST - - 784# 785# HN: Heure Normale ST: Standard Time 786# HA: Heure Avanc<e'>e DT: Daylight saving Time 787# 788# A: de l'Atlantique Atlantic 789# C: du Centre Central 790# E: de l'Est Eastern 791# M: Mountain 792# N: Newfoundland 793# P: du Pacifique Pacific 794# R: des Rocheuses 795# T: de Terre-Neuve 796# Y: du Yukon Yukon 797# 798# From Paul Eggert (1994-11-22): 799# Alas, this sort of thing must be handled by localization software. 800 801# Unless otherwise specified, the data for Canada are all from Shanks. 802 803# From Paul Eggert (2000-10-02): 804# H. David Matthews and Mary Vincent's map 805# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm"> 806# "It's about TIME", _Canadian Geographic_ (September-October 1998) 807# </a> contains detailed boundaries for regions observing nonstandard 808# time and daylight saving time arrangements in Canada circa 1998. 809# 810# INMS, the Institute for National Measurement Standards in Ottawa, has 811# <a href="http://www.nrc.ca/inms/time/tze.html"> 812# information about standard and daylight saving time zones in Canada. 813# </a> (updated periodically). 814# Its unofficial information is often taken from Matthews and Vincent. 815 816# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 817Rule Canada 1918 only - Apr 14 2:00 1:00 D 818Rule Canada 1918 only - Oct 31 2:00 0 S 819Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 820Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 821Rule Canada 1945 only - Sep 30 2:00 0 S 822Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 823Rule Canada 1974 max - Oct lastSun 2:00 0 S 824Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 825 826 827# Newfoundland (and far southeast Labrador) 828 829# From Paul Eggert (2000-10-02): 830# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 831# but the only part of Labrador that follows the rules is the 832# southeast corner, including Port Hope Simpson and Mary's Harbour, 833# but excluding, say, Black Tickle. 834 835# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 836Rule StJohns 1917 only - Apr 8 2:00 1:00 D 837Rule StJohns 1917 only - Sep 17 2:00 0 S 838# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 839Rule StJohns 1919 only - May 5 23:00 1:00 D 840Rule StJohns 1919 only - Aug 12 23:00 0 S 841# For 1931-1935 Whitman gives Apr same date; go with Shanks. 842Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 843Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 844# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks. 845Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 846Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 847# Whitman gives the following transitions: 848# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 849# but go with Shanks and assume they used Canadian rules. 850# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 851# Apr 30 - Sep 24; go with Shanks. 852Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 853Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 854Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 855Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 856Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 857# From Paul Eggert (2000-10-02): 858# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 859# at 00:01 local time. For now, assume it started in 1987. 860Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 861Rule StJohns 1987 max - Oct lastSun 0:01 0 S 862Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 863Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D 864# St John's has an apostrophe, but Posix file names can't have apostrophes. 865# Zone NAME GMTOFF RULES FORMAT [UNTIL] 866Zone America/St_Johns -3:30:52 - LMT 1884 867 -3:30:52 StJohns N%sT 1918 868 -3:30:52 Canada N%sT 1919 869 -3:30:52 StJohns N%sT 1935 Mar 30 870 -3:30 StJohns N%sT 1942 May 11 871 -3:30 Canada N%sT 1946 872 -3:30 StJohns N%sT 873 874# most of east Labrador 875 876# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 877# Zone NAME GMTOFF RULES FORMAT [UNTIL] 878Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 879 -3:30:52 - NST 1918 880 -3:30:52 Canada N%sT 1919 881 -3:30:52 - NST 1935 Mar 30 882 -3:30 - NST 1936 883 -3:30 StJohns N%sT 1942 May 11 884 -3:30 Canada N%sT 1946 885 -3:30 StJohns N%sT 1966 Mar 15 2:00 886 -4:00 StJohns A%sT 887 888 889# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 890 891# From Paul Eggert (1996-06-12): 892# Shanks writes that since 1970 most of this region has been like Halifax. 893# Many locales did not observe peacetime DST until 1972; 894# Glace Bay, NS is the largest that we know of. 895# Shanks also writes that Liverpool, NS was the only town in Canada to observe 896# DST in 1971 but not 1970; for now we'll assume this is a typo. 897 898# From Paul Eggert (2000-10-02): 899# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches 900# at 00:01 local time. FIXME: verify and create a new Zone for this. 901 902 903# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 904Rule Halifax 1916 only - Apr 1 0:00 1:00 D 905Rule Halifax 1916 only - Oct 1 0:00 0 S 906Rule Halifax 1920 only - May 9 0:00 1:00 D 907Rule Halifax 1920 only - Aug 29 0:00 0 S 908Rule Halifax 1921 only - May 6 0:00 1:00 D 909Rule Halifax 1921 1922 - Sep 5 0:00 0 S 910Rule Halifax 1922 only - Apr 30 0:00 1:00 D 911Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 912Rule Halifax 1923 only - Sep 4 0:00 0 S 913Rule Halifax 1924 only - Sep 15 0:00 0 S 914Rule Halifax 1925 only - Sep 28 0:00 0 S 915Rule Halifax 1926 only - May 16 0:00 1:00 D 916Rule Halifax 1926 only - Sep 13 0:00 0 S 917Rule Halifax 1927 only - May 1 0:00 1:00 D 918Rule Halifax 1927 only - Sep 26 0:00 0 S 919Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 920Rule Halifax 1928 only - Sep 9 0:00 0 S 921Rule Halifax 1929 only - Sep 3 0:00 0 S 922Rule Halifax 1930 only - Sep 15 0:00 0 S 923Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 924Rule Halifax 1932 only - May 1 0:00 1:00 D 925Rule Halifax 1933 only - Apr 30 0:00 1:00 D 926Rule Halifax 1933 only - Oct 2 0:00 0 S 927Rule Halifax 1934 only - May 20 0:00 1:00 D 928Rule Halifax 1934 only - Sep 16 0:00 0 S 929Rule Halifax 1935 only - Jun 2 0:00 1:00 D 930Rule Halifax 1935 only - Sep 30 0:00 0 S 931Rule Halifax 1936 only - Jun 1 0:00 1:00 D 932Rule Halifax 1936 only - Sep 14 0:00 0 S 933Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 934Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 935Rule Halifax 1939 only - May 28 0:00 1:00 D 936Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 937Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 938Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 939Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 940Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 941Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 942Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 943Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 944Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 945# Zone NAME GMTOFF RULES FORMAT [UNTIL] 946Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 947 -4:00 Halifax A%sT 1918 948 -4:00 Canada A%sT 1919 949 -4:00 Halifax A%sT 1942 Feb 9 2:00s 950 -4:00 Canada A%sT 1946 951 -4:00 Halifax A%sT 1974 952 -4:00 Canada A%sT 953Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 954 -4:00 Canada A%sT 1953 955 -4:00 Halifax A%sT 1954 956 -4:00 - AST 1972 957 -4:00 Halifax A%sT 1974 958 -4:00 Canada A%sT 959 960 961# Ontario, Quebec 962 963# From Paul Eggert (1996-06-12): 964# Shanks writes that since 1970 most of Ontario has been like Toronto, 965# and most of Quebec has been like Montreal. 966# Thunder Bay skipped DST in 1973. 967# Many smaller locales did not observe peacetime DST until 1974; 968# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 969# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 970 971# From Mark Brader (2003-07-26): 972# [According to the Toronto Star] Orillia, Ontario, adopted DST 973# effective Saturday, 1912-06-22, 22:00; the article mentions that 974# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 975# have already done so. In Orillia DST was to run until Saturday, 976# 1912-08-31 (no time mentioned), but it was met with considerable 977# hostility from certain segments of the public, and was revoked after 978# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but 979# presumably that should be -07-06. (1912-06-19, -07-12; also letters 980# earlier in June). 981# 982# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 983 984# From Paul Eggert (1997-10-17): 985# Mark Brader writes that an article in the 1997-10-14 Toronto Star 986# says that Atikokan, Ontario currently does not observe DST, 987# but will vote on 11-10 whether to use EST/EDT. 988# He also writes that the 989# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 990# Ontario Time Act (1990, Chapter T.9) 991# </a> 992# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 993# Officially Atikokan is therefore on CST/CDT, and most likely this report 994# concerns a non-official time observed as a matter of local practice. 995# For what it's worth, Shanks says that Atikokan has agreed with 996# Rainy River ever since standard time was introduced. 997 998# From Paul Eggert (2000-10-02): 999# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 1000# New Osnaburgh observe CST all year, that Big Trout Lake observes 1001# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 1002# violation of the official Ontario rules. 1003# They also write that Quebec east of the -63 meridian is supposed to 1004# observe AST, but residents as far east as Natashquan use EST/EDT, 1005# and residents east of Natashquan use AST. 1006# We probably need Zones for far east Quebec and for Atikokan, 1007# but we don't know when their practices started. 1008 1009# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1010Rule Mont 1917 only - Mar 25 2:00 1:00 D 1011Rule Mont 1917 only - Apr 24 0:00 0 S 1012Rule Mont 1919 only - Mar 31 2:30 1:00 D 1013Rule Mont 1919 only - Oct 25 2:30 0 S 1014Rule Mont 1920 only - May 2 2:30 1:00 D 1015Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S 1016Rule Mont 1921 only - May 1 2:00 1:00 D 1017Rule Mont 1922 only - Apr 30 2:00 1:00 D 1018Rule Mont 1924 only - May 17 2:00 1:00 D 1019Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 1020Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 1021# The 1927-to-1937 rules can be expressed more simply as 1022# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D 1023# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S 1024# The rules below avoid use of 24:00 1025# (which pre-1998 versions of zic cannot handle). 1026Rule Mont 1927 only - May 1 0:00 1:00 D 1027Rule Mont 1927 1932 - Sep lastSun 0:00 0 S 1028Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D 1029Rule Mont 1932 only - May 1 0:00 1:00 D 1030Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D 1031Rule Mont 1933 only - Oct 1 0:00 0 S 1032Rule Mont 1934 1939 - Sep lastSun 0:00 0 S 1033Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D 1034Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 1035Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 1036Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 1037Rule Mont 1957 1973 - Oct lastSun 2:00 0 S 1038 1039Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1040Rule Toronto 1919 only - Oct 26 0:00 0 S 1041Rule Toronto 1920 only - May 2 2:00 1:00 D 1042Rule Toronto 1920 only - Sep 26 0:00 0 S 1043Rule Toronto 1921 only - May 15 2:00 1:00 D 1044Rule Toronto 1921 only - Sep 15 2:00 0 S 1045Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1046# Shanks says 1923-09-19; assume it's a typo and that "-16" was meant. 1047Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1048Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1049# The 1927-to-1939 rules can be expressed more simply as 1050# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1051# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1052# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1053# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1054# The rules below avoid use of Sun>=25 1055# (which pre-2004 versions of zic cannot handle). 1056Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1057Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1058Rule Toronto 1932 only - May 1 2:00 1:00 D 1059Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1060Rule Toronto 1933 only - Oct 1 2:00 0 S 1061Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1062Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1063Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1064Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1065Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1066Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1067Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1068Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1069Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1070# Shanks says Toronto ended DST a week early in 1971, namely on 1971-10-24, 1071# but Mark Brader wrote (2003-05-31) that he checked the 1971-10-30 issue 1072# of the Toronto Star, and it said that DST ended 1971-10-31 as usual. 1073Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1074 1075# From Paul Eggert (2003-07-27): 1076# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1077# Port Arthur, Ontario, the principle of the Bill has been in 1078# operation for the past three years, and in the City of Moose Jaw, 1079# Saskatchewan, for one year." 1080 1081# From David Bryan via Tory Tronrud, Director/Curator, 1082# Thunder Bay Museum (2003-11-12): 1083# There is some suggestion, however, that, by-law or not, daylight 1084# savings time was being practiced in Fort William and Port Arthur 1085# before 1909.... [I]n 1910, the line between the Eastern and Central 1086# Time Zones was permanently moved about two hundred miles west to 1087# include the Thunder Bay area.... When Canada adopted daylight 1088# savings time in 1916, Fort William and Port Arthur, having done so 1089# already, did not change their clocks.... During the Second World 1090# War,... [t]he cities agreed to implement DST during the summer 1091# months for the remainder of the war years. 1092 1093# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1094Zone America/Montreal -4:54:16 - LMT 1884 1095 -5:00 Mont E%sT 1918 1096 -5:00 Canada E%sT 1919 1097 -5:00 Mont E%sT 1942 Feb 9 2:00s 1098 -5:00 Canada E%sT 1946 1099 -5:00 Mont E%sT 1974 1100 -5:00 Canada E%sT 1101Zone America/Toronto -5:17:32 - LMT 1895 1102 -5:00 Canada E%sT 1919 1103 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1104 -5:00 Canada E%sT 1946 1105 -5:00 Toronto E%sT 1974 1106 -5:00 Canada E%sT 1107Zone America/Thunder_Bay -5:57:00 - LMT 1895 1108 -6:00 - CST 1910 1109 -5:00 - EST 1942 1110 -5:00 Canada E%sT 1970 1111 -5:00 Mont E%sT 1973 1112 -5:00 - EST 1974 1113 -5:00 Canada E%sT 1114Zone America/Nipigon -5:53:04 - LMT 1895 1115 -5:00 Canada E%sT 1940 Sep 29 1116 -5:00 1:00 EDT 1942 Feb 9 2:00s 1117 -5:00 Canada E%sT 1118Zone America/Rainy_River -6:17:56 - LMT 1895 1119 -6:00 Canada C%sT 1940 Sep 29 1120 -6:00 1:00 CDT 1942 Feb 9 2:00s 1121 -6:00 Canada C%sT 1122 1123 1124# Manitoba 1125 1126# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1127Rule Winn 1916 only - Apr 23 0:00 1:00 D 1128Rule Winn 1916 only - Sep 17 0:00 0 S 1129Rule Winn 1918 only - Apr 14 2:00 1:00 D 1130Rule Winn 1918 only - Oct 31 2:00 0 S 1131Rule Winn 1937 only - May 16 2:00 1:00 D 1132Rule Winn 1937 only - Sep 26 2:00 0 S 1133Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1134Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1135Rule Winn 1945 only - Sep lastSun 2:00 0 S 1136Rule Winn 1946 only - May 12 2:00 1:00 D 1137Rule Winn 1946 only - Oct 13 2:00 0 S 1138Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1139Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1140Rule Winn 1950 only - May 1 2:00 1:00 D 1141Rule Winn 1950 only - Sep 30 2:00 0 S 1142Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1143Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1144Rule Winn 1959 only - Oct lastSun 2:00 0 S 1145Rule Winn 1960 only - Sep lastSun 2:00 0 S 1146Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1147Rule Winn 1963 only - Sep 22 2:00 0 S 1148Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 1149Rule Winn 1966 1986 - Oct lastSun 2:00 0 S 1150Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 1151# From Paul Eggert (2000-10-02): 1152# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from 1153# DST at 03:00 local time. For now, assume it started in 1987. 1154Rule Winn 1987 max - Oct lastSun 2:00s 0 S 1155# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1156Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1157 -6:00 Winn C%sT 1158 1159 1160# Saskatchewan 1161 1162# From Mark Brader (2003-07-26): 1163# The first actual adoption of DST in Canada was at the municipal 1164# level. As the [Toronto] Star put it (1912-06-07), "While people 1165# elsewhere have long been talking of legislation to save daylight, 1166# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1167# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1168# presumably late evening, as below), and would run until "the end of 1169# the summer". The discrepancy between municipal time and railroad 1170# time was noted. 1171 1172# From Paul Eggert (2003-07-27): 1173# Willett (1914-03) notes that DST "has been in operation ... in the 1174# City of Moose Jaw, Saskatchewan, for one year." 1175 1176# From Paul Eggert (2000-10-02): 1177# Shanks writes that since 1970 most of this region has been like Regina. 1178# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1179# Other western towns (e.g. Lloydminster) are like Edmonton. 1180# Matthews and Vincent (1998) write that Denare Beach and Creighton 1181# are like Winnipeg, in violation of Saskatchewan law. 1182 1183# From W. Jones (1992-11-06): 1184# The. . .below is based on information I got from our law library, the 1185# provincial archives, and the provincial Community Services department. 1186# A precise history would require digging through newspaper archives, and 1187# since you didn't say what you wanted, I didn't bother. 1188# 1189# Saskatchewan is split by a time zone meridian (105W) and over the years 1190# the boundary became pretty ragged as communities near it reevaluated 1191# their affiliations in one direction or the other. In 1965 a provincial 1192# referendum favoured legislating common time practices. 1193# 1194# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1195# Saskatchewan 1978) was proclaimed, and established that the eastern 1196# part of Saskatchewan would use CST year round, that districts in 1197# northwest Saskatchewan would by default follow CST but could opt to 1198# follow Mountain Time rules (thus 1 hour difference in the winter and 1199# zero in the summer), and that districts in southwest Saskatchewan would 1200# by default follow MT but could opt to follow CST. 1201# 1202# It took a few years for the dust to settle (I know one story of a town 1203# on one time zone having its school in another, such that a mom had to 1204# serve her family lunch in two shifts), but presently it seems that only 1205# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1206# rules any more; all other districts appear to have used CST year round 1207# since sometime in the 1960s. 1208 1209# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1210Rule Regina 1918 only - Apr 14 2:00 1:00 D 1211Rule Regina 1918 only - Oct 31 2:00 0 S 1212Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1213Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1214Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1215Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1216Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1217Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1218Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1219Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1220Rule Regina 1945 only - Sep lastSun 2:00 0 S 1221Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1222Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1223Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1224Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1225Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1226Rule Regina 1959 only - Oct lastSun 2:00 0 S 1227# 1228Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1229Rule Swift 1957 only - Oct lastSun 2:00 0 S 1230Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1231Rule Swift 1959 only - Oct lastSun 2:00 0 S 1232Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1233# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1234Zone America/Regina -6:58:36 - LMT 1905 Sep 1235 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1236 -6:00 - CST 1237Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1238 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1239 -7:00 Regina M%sT 1950 1240 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1241 -6:00 - CST 1242 1243 1244# Alberta 1245 1246# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1247Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1248Rule Edm 1918 only - Oct 31 2:00 0 S 1249Rule Edm 1919 only - May 27 2:00 0 S 1250Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1251Rule Edm 1920 only - Oct lastSun 2:00 0 S 1252Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1253Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1254Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1255Rule Edm 1945 only - Sep lastSun 2:00 0 S 1256Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1257Rule Edm 1947 only - Sep lastSun 2:00 0 S 1258Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1259Rule Edm 1967 only - Oct lastSun 2:00 0 S 1260Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1261Rule Edm 1969 only - Oct lastSun 2:00 0 S 1262Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1263Rule Edm 1972 max - Oct lastSun 2:00 0 S 1264Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 1265# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1266Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1267 -7:00 Edm M%sT 1268 1269 1270# British Columbia 1271 1272# From Paul Eggert (2000-10-02): 1273# Shanks writes that since 1970 most of this region has been like Vancouver. 1274# Dawson Creek uses MST. Much of east BC is like Edmonton. 1275# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1276 1277# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1278Rule Vanc 1918 only - Apr 14 2:00 1:00 D 1279Rule Vanc 1918 only - Oct 31 2:00 0 S 1280Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 1281Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 1282Rule Vanc 1945 only - Sep 30 2:00 0 S 1283Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 1284Rule Vanc 1946 only - Oct 13 2:00 0 S 1285Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 1286Rule Vanc 1962 max - Oct lastSun 2:00 0 S 1287Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 1288# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1289Zone America/Vancouver -8:12:28 - LMT 1884 1290 -8:00 Vanc P%sT 1291Zone America/Dawson_Creek -8:00:56 - LMT 1884 1292 -8:00 Canada P%sT 1947 1293 -8:00 Vanc P%sT 1972 Aug 30 2:00 1294 -7:00 - MST 1295 1296 1297# Northwest Territories, Nunavut, Yukon 1298 1299# From Paul Eggert (1999-10-29): 1300# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 1301# Mathew Englander (1996-10-07) gives the following refs: 1302# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 1303# c. 7 defines Yukon standard time as UTC-9. This is still valid; 1304# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 1305# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 1306# * O.I.C. 1980/02 established DST. 1307# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 1308# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 1309 1310# From Rives McDow (1999-09-04): 1311# Nunavut ... moved ... to incorporate the whole territory into one time zone. 1312# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 1313# Nunavut moves to single time zone Oct. 31 1314# </a> 1315# 1316# From Antoine Leca (1999-09-06): 1317# We then need to create a new timezone for the Kitikmeot region of Nunavut 1318# to differentiate it from the Yellowknife region. 1319 1320# From Paul Eggert (1999-09-20): 1321# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 1322# Basic Facts: The New Territory 1323# </a> (1999) reports that Pangnirtung operates on eastern time, 1324# and that Coral Harbour does not observe DST. We don't know when 1325# Pangnirtung switched to eastern time; we'll guess 1995. 1326 1327# From Rives McDow (1999-11-08): 1328# On October 31, when the rest of Nunavut went to Central time, 1329# Pangnirtung wobbled. Here is the result of their wobble: 1330# 1331# The following businesses and organizations in Pangnirtung use Central Time: 1332# 1333# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 1334# Eastern Arctic National Parks, A & D Specialist 1335# 1336# The following businesses and organizations in Pangnirtung use Eastern Time: 1337# 1338# Hamlet office, All other businesses, Both schools, Airport operator 1339# 1340# This has made for an interesting situation there, which warranted the news. 1341# No one there that I spoke with seems concerned, or has plans to 1342# change the local methods of keeping time, as it evidently does not 1343# really interfere with any activities or make things difficult locally. 1344# They plan to celebrate New Year's turn-over twice, one hour apart, 1345# so it appears that the situation will last at least that long. 1346# The Nunavut Intergovernmental Affairs hopes that they will "come to 1347# their senses", but the locals evidently don't see any problem with 1348# the current state of affairs. 1349 1350# From Michaela Rodrigue, writing in the 1351# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 1352# Nunatsiaq News (1999-11-19)</a>: 1353# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 1354# central - or Nunavut time - for government offices, and eastern time 1355# for municipal offices and schools.... Igloolik [was similar but then] 1356# made the switch to central time on Saturday, Nov. 6. 1357 1358# From Paul Eggert (2000-10-02): 1359# Matthews and Vincent (1998) say the following, but we lack histories 1360# for these potential new Zones. 1361# 1362# The Canadian Forces station at Alert uses Eastern Time while the 1363# handful of residents at the Eureka weather station [in the Central 1364# zone] skip daylight savings. Baffin Island, which is crossed by the 1365# Central, Eastern and Atlantic Time zones only uses Eastern Time. 1366# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 1367# Central Time and Southampton Island [in the Central zone] is not 1368# required to use daylight savings. 1369 1370# From 1371# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> 1372# Nunavut now has two time zones 1373# </a> (2000-11-10): 1374# The Nunavut government would allow its employees in Kugluktuk and 1375# Cambridge Bay to operate on central time year-round, putting them 1376# one hour behind the rest of Nunavut for six months during the winter. 1377# At the end of October the two communities had rebelled against 1378# Nunavut's unified time zone, refusing to shift to eastern time with 1379# the rest of the territory for the winter. Cambridge Bay remained on 1380# central time, while Kugluktuk, even farther west, reverted to 1381# mountain time, which they had used before the advent of Nunavut's 1382# unified time zone in 1999. 1383# 1384# From Rives McDow (2001-01-20), quoting the Nunavut government: 1385# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 1386 1387# From Paul Eggert (2000-12-04): 1388# Let's just keep track of the official times for now. 1389 1390# From Rives McDow (2001-03-07): 1391# The premier of Nunavut has issued a ministerial statement advising 1392# that effective 2001-04-01, the territory of Nunavut will revert 1393# back to three time zones (mountain, central, and eastern). Of the 1394# cities in Nunavut, Coral Harbor is the only one that I know of that 1395# has said it will not observe dst, staying on EST year round. I'm 1396# checking for more info, and will get back to you if I come up with 1397# more. 1398# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 1399 1400# From Gwillim Law (2005-05-21): 1401# According to maps at 1402# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg 1403# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg 1404# (both dated 2003), and 1405# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 1406# (from a 1998 Canadian Geographic article), the de facto and de jure time 1407# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 1408# round. Using Google, it's easy to find other websites that confirm this. 1409# I wasn't able to find how far back this time regimen goes, but since it 1410# predates the creation of Nunavut, it probably goes back many years.... 1411# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 1412# 1413# From Paul Eggert (2005-07-26): 1414# For lack of better information, assume that Southampton Island observed 1415# daylight saving only during wartime. 1416 1417# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1418Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 1419Rule NT_YK 1918 only - Oct 27 2:00 0 S 1420Rule NT_YK 1919 only - May 25 2:00 1:00 D 1421Rule NT_YK 1919 only - Nov 1 0:00 0 S 1422Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 1423Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 1424Rule NT_YK 1945 only - Sep 30 2:00 0 S 1425Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 1426Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 1427Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 1428Rule NT_YK 1980 max - Oct lastSun 2:00 0 S 1429Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 1430# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1431Zone America/Pangnirtung -4:22:56 - LMT 1884 1432 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 1433 -5:00 Canada E%sT 1999 Oct 31 2:00 1434 -6:00 Canada C%sT 2000 Oct 29 2:00 1435 -5:00 Canada E%sT 1436Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 1437 -5:00 NT_YK E%sT 1999 Oct 31 2:00 1438 -6:00 Canada C%sT 2000 Oct 29 2:00 1439 -5:00 Canada E%sT 1440Zone America/Coral_Harbour -5:32:40 - LMT 1884 1441 -5:00 NT_YK E%sT 1946 1442 -5:00 - EST 1443Zone America/Rankin_Inlet -6:08:40 - LMT 1884 1444 -6:00 NT_YK C%sT 2000 Oct 29 2:00 1445 -5:00 - EST 2001 Apr 1 3:00 1446 -6:00 Canada C%sT 1447Zone America/Cambridge_Bay -7:00:20 - LMT 1884 1448 -7:00 NT_YK M%sT 1999 Oct 31 2:00 1449 -6:00 Canada C%sT 2000 Oct 29 2:00 1450 -5:00 - EST 2000 Nov 5 0:00 1451 -6:00 - CST 2001 Apr 1 3:00 1452 -7:00 Canada M%sT 1453Zone America/Yellowknife -7:37:24 - LMT 1884 1454 -7:00 NT_YK M%sT 1455Zone America/Inuvik -8:54:00 - LMT 1884 1456 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 1457 -7:00 NT_YK M%sT 1458Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 1459 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 1460 -8:00 NT_YK P%sT 1461Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 1462 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 1463 -8:00 NT_YK P%sT 1464 1465 1466############################################################################### 1467 1468# Mexico 1469 1470# From Paul Eggert (2001-03-05): 1471# The Investigation and Analysis Service of the 1472# Mexican Library of Congress (MLoC) has published a 1473# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> 1474# history of Mexican local time (in Spanish) 1475# </a>. 1476# 1477# Here are the discrepancies between Shanks and the MLoC. 1478# (In all cases we go with the MLoC.) 1479# Shanks reports that Baja was at -8:00 in 1922/1923. 1480# Shanks says the 1930 transition in Baja was 1930-11-16. 1481# Shanks reports no DST during summer 1931. 1482# Shanks reports a transition at 1932-03-30 23:00, not 1932-04-01. 1483# Shanks does not report transitions for Baja in 1945 or 1948. 1484# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23. 1485# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00 1486# on 1997-10-26 at 02:00. 1487 1488# From Gwillim Law (2001-02-20): 1489# There are some other discrepancies between the Decrees page and the 1490# tz database. I think they can best be explained by supposing that 1491# the researchers who prepared the Decrees page failed to find some of 1492# the relevant documents. 1493 1494# From Paul Eggert (2000-07-26): 1495# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 1496# and 1988 DST experiments. Go with spin.com.mx. 1497 1498# From Alan Perry (1996-02-15): 1499# A guy from our Mexico subsidiary finally found the Presidential Decree 1500# outlining the timezone changes in Mexico. 1501# 1502# ------------- Begin Forwarded Message ------------- 1503# 1504# I finally got my hands on the Official Presidential Decree that sets up the 1505# rules for the DST changes. The rules are: 1506# 1507# 1. The country is divided in 3 timezones: 1508# - Baja California Norte (the Mexico/BajaNorte TZ) 1509# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 1510# - The rest of the country (the Mexico/General TZ) 1511# 1512# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 1513# at 2:00 AM, the times in each zone are as follows: 1514# BajaNorte: GMT+7 1515# BajaSur: GMT+6 1516# General: GMT+5 1517# 1518# 3. The rest of the year, the times are as follows: 1519# BajaNorte: GMT+8 1520# BajaSur: GMT+7 1521# General: GMT+6 1522# 1523# The Decree was published in Mexico's Official Newspaper on January 4th. 1524# 1525# -------------- End Forwarded Message -------------- 1526# From Paul Eggert (1996-06-12): 1527# For an English translation of the decree, see 1528# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 1529# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 1530# </a> 1531 1532# From Rives McDow (1998-10-08): 1533# The State of Quintana Roo has reverted back to central STD and DST times 1534# (i.e. UTC -0600 and -0500 as of 1998-08-02). 1535 1536# From Rives McDow (2000-01-10): 1537# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 1538# zone 5 hours from the International Date Line, and will not observe daylight 1539# savings time so as to stay on the same time zone as the southern part of 1540# Arizona year round. 1541 1542# From Jesper Norgaard, translating 1543# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 1544# In Oaxaca, the 55.000 teachers from the Section 22 of the National 1545# Syndicate of Education Workers, refuse to apply daylight saving each 1546# year, so that the more than 10,000 schools work at normal hour the 1547# whole year. 1548 1549# From Gwillim Law (2001-01-19): 1550# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 1551# (translated):... 1552# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 1553# that Summer Time will be reduced from seven to five months, starting 1554# this year.... 1555# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> 1556# [translated], says "summer time will ... take effect on the first Sunday 1557# in May, and end on the last Sunday of September. 1558 1559# From Arthur David Olson (2001-01-25): 1560# The 2001-01-24 traditional Washington Post contained the page one 1561# story "Timely Issue Divides Mexicans."... 1562# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 1563# ... Mexico City Mayor Lopez Obrador "...is threatening to keep 1564# Mexico City and its 20 million residents on a different time than 1565# the rest of the country..." In particular, Lopez Obrador would abolish 1566# observation of Daylight Saving Time. 1567 1568# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> 1569# Official statute published by the Energy Department 1570# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 1571# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). 1572 1573# From Paul Eggert (2001-03-03): 1574# 1575# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> 1576# James F. Smith writes in today's LA Times 1577# </a> 1578# * Sonora will continue to observe standard time. 1579# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that 1580# the Federal District will not adopt DST. 1581# * 4 of 16 district leaders announced they'll ignore the decree. 1582# * The decree does not affect federal-controlled facilities including 1583# the airport, banks, hospitals, and schools. 1584# 1585# For now we'll assume that the Federal District will bow to federal rules. 1586 1587# From Jesper Norgaard (2001-04-01): 1588# I found some references to the Mexican application of daylight 1589# saving, which modifies what I had already sent you, stating earlier 1590# that a number of northern Mexican states would go on daylight 1591# saving. The modification reverts this to only cover Baja California 1592# (Norte), while all other states (except Sonora, who has no daylight 1593# saving all year) will follow the original decree of president 1594# Vicente Fox, starting daylight saving May 6, 2001 and ending 1595# September 30, 2001. 1596# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> 1597# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 1598 1599# From Reuters (2001-09-04): 1600# Mexico's Supreme Court on Tuesday declared that daylight savings was 1601# unconstitutional in Mexico City, creating the possibility the 1602# capital will be in a different time zone from the rest of the nation 1603# next year.... The Supreme Court's ruling takes effect at 2:00 1604# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 1605# standard time. "This is so residents of the Federal District are not 1606# subject to unexpected time changes," a statement from the court said. 1607 1608# From Jesper Norgaard Welen (2002-03-12): 1609# ... consulting my local grocery store(!) and my coworkers, they all insisted 1610# that a new decision had been made to reinstate US style DST in Mexico.... 1611# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 1612# confirms this. Sonora as usual is the only state where DST is not applied. 1613 1614# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1615Rule Mexico 1939 only - Feb 5 0:00 1:00 D 1616Rule Mexico 1939 only - Jun 25 0:00 0 S 1617Rule Mexico 1940 only - Dec 9 0:00 1:00 D 1618Rule Mexico 1941 only - Apr 1 0:00 0 S 1619Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 1620Rule Mexico 1944 only - May 1 0:00 0 S 1621Rule Mexico 1950 only - Feb 12 0:00 1:00 D 1622Rule Mexico 1950 only - Jul 30 0:00 0 S 1623Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 1624Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 1625Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 1626Rule Mexico 2001 only - Sep lastSun 2:00 0 S 1627Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 1628Rule Mexico 2002 max - Oct lastSun 2:00 0 S 1629# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1630# Quintana Roo 1631Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 1632 -6:00 - CST 1981 Dec 23 1633 -5:00 Mexico E%sT 1998 Aug 2 2:00 1634 -6:00 Mexico C%sT 1635# Campeche, Yucatan 1636Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 1637 -6:00 - CST 1981 Dec 23 1638 -5:00 - EST 1982 Dec 2 1639 -6:00 Mexico C%sT 1640# Coahuila, Durango, Nuevo Leon, Tamaulipas 1641Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 1642 -6:00 - CST 1988 1643 -6:00 US C%sT 1989 1644 -6:00 Mexico C%sT 1645# Central Mexico 1646Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 1647 -7:00 - MST 1927 Jun 10 23:00 1648 -6:00 - CST 1930 Nov 15 1649 -7:00 - MST 1931 May 1 23:00 1650 -6:00 - CST 1931 Oct 1651 -7:00 - MST 1932 Apr 1 1652 -6:00 Mexico C%sT 2001 Sep 30 02:00 1653 -6:00 - CST 2002 Feb 20 1654 -6:00 Mexico C%sT 1655# Chihuahua 1656Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 1657 -7:00 - MST 1927 Jun 10 23:00 1658 -6:00 - CST 1930 Nov 15 1659 -7:00 - MST 1931 May 1 23:00 1660 -6:00 - CST 1931 Oct 1661 -7:00 - MST 1932 Apr 1 1662 -6:00 - CST 1996 1663 -6:00 Mexico C%sT 1998 1664 -6:00 - CST 1998 Apr Sun>=1 3:00 1665 -7:00 Mexico M%sT 1666# Sonora 1667Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 1668 -7:00 - MST 1927 Jun 10 23:00 1669 -6:00 - CST 1930 Nov 15 1670 -7:00 - MST 1931 May 1 23:00 1671 -6:00 - CST 1931 Oct 1672 -7:00 - MST 1932 Apr 1 1673 -6:00 - CST 1942 Apr 24 1674 -7:00 - MST 1949 Jan 14 1675 -8:00 - PST 1970 1676 -7:00 Mexico M%sT 1999 1677 -7:00 - MST 1678# Baja California Sur, Nayarit, Sinaloa 1679Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 1680 -7:00 - MST 1927 Jun 10 23:00 1681 -6:00 - CST 1930 Nov 15 1682 -7:00 - MST 1931 May 1 23:00 1683 -6:00 - CST 1931 Oct 1684 -7:00 - MST 1932 Apr 1 1685 -6:00 - CST 1942 Apr 24 1686 -7:00 - MST 1949 Jan 14 1687 -8:00 - PST 1970 1688 -7:00 Mexico M%sT 1689# Baja California 1690Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 1691 -7:00 - MST 1924 1692 -8:00 - PST 1927 Jun 10 23:00 1693 -7:00 - MST 1930 Nov 15 1694 -8:00 - PST 1931 Apr 1 1695 -8:00 1:00 PDT 1931 Sep 30 1696 -8:00 - PST 1942 Apr 24 1697 -8:00 1:00 PWT 1945 Nov 12 1698 -8:00 - PST 1948 Apr 5 1699 -8:00 1:00 PDT 1949 Jan 14 1700 -8:00 - PST 1954 1701 -8:00 CA P%sT 1961 1702 -8:00 - PST 1976 1703 -8:00 US P%sT 1996 1704 -8:00 Mexico P%sT 2001 1705 -8:00 US P%sT 2002 Feb 20 1706 -8:00 Mexico P%sT 1707# From Paul Eggert (2001-03-05): 1708# Formerly there was an America/Ensenada zone, which differed from 1709# America/Tijuana only in that it did not observe DST from 1976 1710# through 1995. This was as per Shanks. However, Guy Harris reports 1711# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and 1712# Tijuana observe DST," which contradicts Shanks but does imply that 1713# DST-observance was a town-by-town matter back then. This concerns 1714# data after 1970 so most likely there should be at least one Zone 1715# other than America/Tijuana for Baja, but it's not clear yet what its 1716# name or contents should be. 1717# 1718# Revillagigedo Is 1719# no information 1720 1721############################################################################### 1722 1723# Anguilla 1724# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1725Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 1726 -4:00 - AST 1727 1728# Antigua and Barbuda 1729# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1730Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 1731 -5:00 - EST 1951 1732 -4:00 - AST 1733 1734# Bahamas 1735# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1736Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 1737Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 1738Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 1739# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1740Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 1741 -5:00 Bahamas E%sT 1742 1743# Barbados 1744# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1745Rule Barb 1977 only - Jun 12 2:00 1:00 D 1746Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1747Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1748Rule Barb 1979 only - Sep 30 2:00 0 S 1749Rule Barb 1980 only - Sep 25 2:00 0 S 1750# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1751Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1752 -3:58:28 - BMT 1932 # Bridgetown Mean Time 1753 -4:00 Barb A%sT 1754 1755# Belize 1756# Whitman entirely disagrees with Shanks; go with Shanks. 1757# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1758Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1759Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1760Rule Belize 1973 only - Dec 5 0:00 1:00 D 1761Rule Belize 1974 only - Feb 9 0:00 0 S 1762Rule Belize 1982 only - Dec 18 0:00 1:00 D 1763Rule Belize 1983 only - Feb 12 0:00 0 S 1764# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1765Zone America/Belize -5:52:48 - LMT 1912 Apr 1766 -6:00 Belize C%sT 1767 1768# Bermuda 1769# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1770Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1771 -4:00 - AST 1974 Apr 28 2:00 1772 -4:00 Bahamas A%sT 1773 1774# Cayman Is 1775# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1776Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1777 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1778 -5:00 - EST 1779 1780# Costa Rica 1781# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1782Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1783Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1784Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 1785# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 1786Rule CR 1991 only - Jul 1 0:00 0 S 1787Rule CR 1992 only - Mar 15 0:00 0 S 1788# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1789# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1790Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1791 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 1792 -6:00 CR C%sT 1793# Coco 1794# no information; probably like America/Costa_Rica 1795 1796# Cuba 1797 1798# From Arthur David Olson (1999-03-29): 1799# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 1800# the Cuban National Team and the Baltimore Orioles was carried live on 1801# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 1802# During the game, play-by-play announcer Jim Hunter noted that 1803# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 1804# Time today." (The "two hour" remark referred to losing one hour of 1805# sleep on 1999-03-28--when the announcers were in Cuba as it switched 1806# to DST--and one more hour on 1999-04-04--when the announcers will have 1807# returned to Baltimore, which switches on that date.) 1808 1809# From Evert van der Veer via Steffen Thorsen (2004-10-28): 1810# Cuba is not going back to standard time this year. 1811# From Paul Eggert (2004-10-28): 1812# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 1813# says that it's due to a problem at the Antonio Guiteras 1814# thermoelectric plant, and says "This October there will be no return 1815# to normal hours (after daylight saving time)". 1816# For now, let's assume that it's a one-year temporary measure. 1817 1818# From Carlos A. Carnero Delgado (2005-11-12): 1819# This year (just like in 2004-2005) there's no change in time zone 1820# adjustment in Cuba. We will stay in daylight saving time: 1821# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html 1822 1823# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1824Rule Cuba 1928 only - Jun 10 0:00 1:00 D 1825Rule Cuba 1928 only - Oct 10 0:00 0 S 1826Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 1827Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 1828Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 1829Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 1830Rule Cuba 1965 only - Jun 1 0:00 1:00 D 1831Rule Cuba 1965 only - Sep 30 0:00 0 S 1832Rule Cuba 1966 only - May 29 0:00 1:00 D 1833Rule Cuba 1966 only - Oct 2 0:00 0 S 1834Rule Cuba 1967 only - Apr 8 0:00 1:00 D 1835Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 1836Rule Cuba 1968 only - Apr 14 0:00 1:00 D 1837Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 1838Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 1839Rule Cuba 1972 1974 - Oct 8 0:00 0 S 1840Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 1841Rule Cuba 1978 only - May 7 0:00 1:00 D 1842Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 1843Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 1844Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 1845Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 1846Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 1847Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 1848Rule Cuba 1996 only - Oct 6 0:00s 0 S 1849Rule Cuba 1997 only - Oct 12 0:00s 0 S 1850Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 1851Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 1852Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D 1853Rule Cuba 2006 max - Oct lastSun 0:00s 0 S 1854 1855# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1856Zone America/Havana -5:29:28 - LMT 1890 1857 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 1858 -5:00 Cuba C%sT 1859 1860# Dominica 1861# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1862Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 1863 -4:00 - AST 1864 1865# Dominican Republic 1866 1867# From Steffen Thorsen (2000-10-30): 1868# Enrique Morales reported to me that the Dominican Republic has changed the 1869# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 1870# http://www.listin.com.do/antes/261000/republica/princi.html 1871 1872# From Paul Eggert (2000-12-04): 1873# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 1874 1875# From Rives McDow (2000-12-01): 1876# Dominican Republic changed its mind and presidential decree on Tuesday, 1877# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 1878# Dominican Republic will be reverting to 8 hours from the International Date 1879# Line, and will not be using DST in the foreseeable future. The reason they 1880# decided to use DST was to be in synch with Puerto Rico, who was also going 1881# to implement DST. When Puerto Rico didn't implement DST, the president 1882# decided to revert. 1883 1884 1885# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1886Rule DR 1966 only - Oct 30 0:00 1:00 D 1887Rule DR 1967 only - Feb 28 0:00 0 S 1888Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 1889Rule DR 1970 only - Feb 21 0:00 0 S 1890Rule DR 1971 only - Jan 20 0:00 0 S 1891Rule DR 1972 1974 - Jan 21 0:00 0 S 1892# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1893Zone America/Santo_Domingo -4:39:36 - LMT 1890 1894 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 1895 -5:00 DR E%sT 1974 Oct 27 1896 -4:00 - AST 2000 Oct 29 02:00 1897 -5:00 US E%sT 2000 Dec 3 01:00 1898 -4:00 - AST 1899 1900# El Salvador 1901# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1902Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 1903Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 1904# There are too many San Salvadors elsewhere, so use America/El_Salvador 1905# instead of America/San_Salvador. 1906# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1907Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 1908 -6:00 Salv C%sT 1909 1910# Grenada 1911# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1912Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 1913 -4:00 - AST 1914 1915# Guadeloupe 1916# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1917Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 1918 -4:00 - AST 1919 1920# Guatemala 1921# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1922Rule Guat 1973 only - Nov 25 0:00 1:00 D 1923Rule Guat 1974 only - Feb 24 0:00 0 S 1924Rule Guat 1983 only - May 21 0:00 1:00 D 1925Rule Guat 1983 only - Sep 22 0:00 0 S 1926Rule Guat 1991 only - Mar 23 0:00 1:00 D 1927Rule Guat 1991 only - Sep 7 0:00 0 S 1928# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1929Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 1930 -6:00 Guat C%sT 1931 1932# Haiti 1933# From Gwillim Law (2005-04-15): 1934# Risto O. Nykanen wrote me that Haiti is now on DST. 1935# I searched for confirmation, and I found a 1936# <a href="http://www.haitianconsulate.org/time.doc"> press release 1937# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 1938# </a>. Translated from French, it says: 1939# 1940# "The Prime Minister's Communication Office notifies the public in general 1941# and the press in particular that, following a decision of the Interior 1942# Ministry and the Territorial Collectivities [I suppose that means the 1943# provinces], Haiti will move to Eastern Daylight Time in the night from next 1944# Saturday the 2nd to Sunday the 3rd. 1945# 1946# "Consequently, the Prime Minister's Communication Office wishes to inform 1947# the population that the country's clocks will be set forward one hour 1948# starting at midnight. This provision will hold until the last Saturday in 1949# October 2005. 1950# 1951# "Port-au-Prince, March 31, 2005" 1952 1953# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1954Rule Haiti 1983 only - May 8 0:00 1:00 D 1955Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 1956Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 1957# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA. 1958Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 1959Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 1960Rule Haiti 2005 only - Apr Sun>=1 0:00 1:00 D 1961Rule Haiti 2005 only - Oct lastSun 0:00 0 S 1962# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1963Zone America/Port-au-Prince -4:49:20 - LMT 1890 1964 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 1965 -5:00 Haiti E%sT 1966 1967# Honduras 1968# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 1969# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1970Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 1971 -6:00 Salv C%sT 1972# 1973# Great Swan I ceded by US to Honduras in 1972 1974 1975# Jamaica 1976 1977# From Bob Devine (1988-01-28): 1978# Follows US rules. 1979 1980# From U. S. Naval Observatory (1989-01-19): 1981# JAMAICA 5 H BEHIND UTC 1982 1983# From Shanks: 1984# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1985Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 1986 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1987 -5:00 - EST 1974 Apr 28 2:00 1988 -5:00 US E%sT 1984 1989 -5:00 - EST 1990 1991# Martinique 1992# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1993Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 1994 -4:04:20 - FFMT 1911 May # Fort-de-France MT 1995 -4:00 - AST 1980 Apr 6 1996 -4:00 1:00 ADT 1980 Sep 28 1997 -4:00 - AST 1998 1999# Montserrat 2000# From Paul Eggert (1997-08-31): 2001# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 2002# Luckily, Olveston, the current de facto capital, has the same longitude. 2003# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2004Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 2005 -4:00 - AST 2006 2007# Nicaragua 2008# 2009# From Steffen Thorsen (1998-12-29): 2010# Nicaragua seems to be back at -6:00 but I have not been able to find when 2011# they changed from -5:00. 2012# 2013# From Steffen Thorsen (2005-04-12): 2014# I've got reports from 8 different people that Nicaragua just started 2015# DST on Sunday 2005-04-10, in order to save energy because of 2016# expensive petroleum. The exact end date for DST is not yet 2017# announced, only "September" but some sites also say "mid-September". 2018# Some background information is available on the President's official site: 2019# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 2020# The Decree, no 23-2005 is available here: 2021# 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 2022# 2023# From Paul Eggert (2005-05-01): 2024# The decree doesn't say anything about daylight saving, but for now let's 2025# assume that it is daylight saving and that they'll switch back on the 2026# 3rd Sunday in September. 2027# 2028# From Gwillim Law (2005-04-21): 2029# The Associated Press story on the time change, which can be found at 2030# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 2031# and elsewhere, says (fifth paragraph, translated from Spanish): "The last 2032# time that a change of clocks was applied to save energy was in the year 2000 2033# during the Arnoldo Aleman administration."... 2034# The northamerica file says that Nicaragua has been on UTC-6 continuously 2035# since December 1998. I wasn't able to find any details of Nicaraguan time 2036# changes in 2000. Perhaps a note could be added to the northamerica file, to 2037# the effect that we have indirect evidence that DST was observed in 2000. 2038# 2039# From Jesper Norgaard Welen (2005-11-02): 2040# Nicaragua left DST the 2005-10-02 at 00:00 (local time). 2041# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm 2042# (2005-09-26) 2043# 2044# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2045Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 2046Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 2047Rule Nic 1992 only - Jan 1 4:00 1:00 D 2048Rule Nic 1992 only - Sep 24 0:00 0 S 2049Rule Nic 2005 only - Apr 10 0:00 1:00 D 2050Rule Nic 2005 only - Oct 2 0:00 0 S 2051# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2052Zone America/Managua -5:45:08 - LMT 1890 2053 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 2054 -6:00 - CST 1973 May 2055 -5:00 - EST 1975 Feb 16 2056 -6:00 Nic C%sT 1993 Jan 1 4:00 2057 -5:00 - EST 1998 Dec 2058 -6:00 Nic C%sT 2059 2060# Panama 2061# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2062Zone America/Panama -5:18:08 - LMT 1890 2063 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time 2064 -5:00 - EST 2065 2066# Puerto Rico 2067# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 2068# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2069Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 2070 -4:00 - AST 1942 May 3 2071 -4:00 1:00 AWT 1945 Sep 30 2:00 2072 -4:00 - AST 2073 2074# St Kitts-Nevis 2075# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2076Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 2077 -4:00 - AST 2078 2079# St Lucia 2080# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2081Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 2082 -4:04:00 - CMT 1912 # Castries Mean Time 2083 -4:00 - AST 2084 2085# St Pierre and Miquelon 2086# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 2087# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2088Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 2089 -4:00 - AST 1980 May 2090 -3:00 - PMST 1987 # Pierre & Miquelon Time 2091 -3:00 Canada PM%sT 2092 2093# St Vincent and the Grenadines 2094# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2095Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 2096 -4:04:56 - KMT 1912 # Kingstown Mean Time 2097 -4:00 - AST 2098 2099# Turks and Caicos 2100# From Paul Eggert (1998-08-06): 2101# Shanks says they use US DST rules, but IATA SSIM (1991/1998) 2102# says they switch at midnight. Go with IATA SSIM. 2103# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2104Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D 2105Rule TC 1979 max - Oct lastSun 0:00 0 S 2106Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D 2107# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2108Zone America/Grand_Turk -4:44:32 - LMT 1890 2109 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 2110 -5:00 TC E%sT 2111 2112# British Virgin Is 2113# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2114Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 2115 -4:00 - AST 2116 2117# Virgin Is 2118# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2119Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 2120 -4:00 - AST 2121