1# @(#)northamerica 7.79 2# also includes Central America and the Caribbean 3 4# This data is by no means authoritative; if you think you know better, 5# go ahead and edit the file (and please send any changes to 6# tz@elsie.nci.nih.gov for general use in the future). 7 8# From Paul Eggert (1999-03-22): 9# A reliable and entertaining source about time zones is 10# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 11 12############################################################################### 13 14# United States 15 16# From Paul Eggert (1999-03-31): 17# Howse writes (pp 121-125) that time zones were invented by 18# Professor Charles Ferdinand Dowd (1825-1904), 19# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 20# His pamphlet ``A System of National Time for Railroads'' (1870) 21# was the result of his proposals at the Convention of Railroad Trunk Lines 22# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 23# but in 1872-05 he moved the proposed origin to Greenwich. 24# His proposal was adopted by the railroads on 1883-11-18 at 12:00, 25# and the most of the country soon followed suit. 26 27# From Paul Eggert (2005-04-16): 28# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 29# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 30 31# From Paul Eggert (1995-12-19): 32# A good source for time zone historical data in the US is 33# Thomas G. Shanks, The American Atlas (5th edition), 34# San Diego: ACS Publications, Inc. (1991). 35# Make sure you have the errata sheet; the book is somewhat useless without it. 36# It is the source for most of the pre-1991 US and Puerto Rico entries below. 37 38# From Paul Eggert (2001-03-06): 39# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 40# in his whimsical essay ``An Economical Project for Diminishing the Cost 41# of Light'' published in the Journal de Paris (1784-04-26). 42# Not everyone is happy with the results: 43# 44# I don't really care how time is reckoned so long as there is some 45# agreement about it, but I object to being told that I am saving 46# daylight when my reason tells me that I am doing nothing of the kind. 47# I even object to the implication that I am wasting something 48# valuable if I stay in bed after the sun has risen. As an admirer 49# of moonlight I resent the bossy insistence of those who want to 50# reduce my time for enjoying it. At the back of the Daylight Saving 51# scheme I detect the bony, blue-fingered hand of Puritanism, eager 52# to push people into bed earlier, and get them up earlier, to make 53# them healthy, wealthy and wise in spite of themselves. 54# 55# -- Robertson Davies, The diary of Samuel Marchbanks, 56# Clarke, Irwin (1947), XIX, Sunday 57# 58# For more about the first ten years of DST in the United States, see 59# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html"> 60# Ten years of daylight saving from the Pittsburgh standpoint 61# (Carnegie Library of Pittsburgh, 1927)</a>. 62# 63# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 64# However, DST was imposed by the Standard Time Act of 1918, which 65# was the first nationwide legal time standard, and apparently 66# time was just called "Standard Time" or "Daylight Saving Time". 67 68# From Arthur David Olson: 69# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 70# See, for example, the front page of the Saturday, 1974-10-26 71# and Sunday, 1974-10-27 editions of the Washington Post. 72 73# From Arthur David Olson: 74# Before the Uniform Time Act of 1966 took effect in 1967, observance of 75# Daylight Saving Time in the US was by local option, except during wartime. 76 77# From Arthur David Olson (2000-09-25): 78# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 79# In the introduction, Oboler spoke of "Eastern Peace Time." 80# An AltaVista search turned up 81# <a href="http://rowayton.org/rhs/hstaug45.html">: 82# "When the time is announced over the radio now, it is 'Eastern Peace 83# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 84# </a> (August 1945) by way of confirmation. 85 86# From Joseph Gallant 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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 248Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 249Rule NYC 1920 only - Oct lastSun 2:00 0 S 250Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 251Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 252Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 253# Zone NAME GMTOFF RULES FORMAT [UNTIL] 254Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 255 -5:00 US E%sT 1920 256 -5:00 NYC E%sT 1942 257 -5:00 US E%sT 1946 258 -5:00 NYC E%sT 1967 259 -5:00 US E%sT 260 261# US central time, represented by Chicago 262 263# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 264# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 265# Washington counties), Illinois, western Indiana 266# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 267# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 268# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 269# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 270# western Tennessee, most of Texas, Wisconsin 271 272# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 273Rule Chicago 1920 only - Jun 13 2:00 1:00 D 274Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 275Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 276Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 277Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 278Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 279# Zone NAME GMTOFF RULES FORMAT [UNTIL] 280Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 281 -6:00 US C%sT 1920 282 -6:00 Chicago C%sT 1936 Mar 1 2:00 283 -5:00 - EST 1936 Nov 15 2:00 284 -6:00 Chicago C%sT 1942 285 -6:00 US C%sT 1946 286 -6:00 Chicago C%sT 1967 287 -6:00 US C%sT 288# Oliver County, ND switched from mountain to central time on 1992-10-25. 289Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 290 -7:00 US M%sT 1992 Oct 25 02:00 291 -6:00 US C%sT 292 293# US mountain time, represented by Denver 294# 295# Colorado, far western Kansas, Montana, western 296# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 297# New Mexico, southwestern North Dakota, far eastern Oregon, 298# western South Dakota, far western Texas (El Paso County, Hudspeth County, 299# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 300# 301# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 302Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 303Rule Denver 1920 only - Oct lastSun 2:00 0 S 304Rule Denver 1921 only - May 22 2:00 0 S 305Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 306Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 307# Zone NAME GMTOFF RULES FORMAT [UNTIL] 308Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 309 -7:00 US M%sT 1920 310 -7:00 Denver M%sT 1942 311 -7:00 US M%sT 1946 312 -7:00 Denver M%sT 1967 313 -7:00 US M%sT 314 315# US Pacific time, represented by Los Angeles 316# 317# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 318# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties), 319# most of Nevada, most of Oregon, and Washington 320# 321# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 322Rule CA 1948 only - Mar 14 2:00 1:00 D 323Rule CA 1949 only - Jan 1 2:00 0 S 324Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 325Rule CA 1950 1961 - Sep lastSun 2:00 0 S 326Rule CA 1962 1966 - Oct lastSun 2:00 0 S 327# Zone NAME GMTOFF RULES FORMAT [UNTIL] 328Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 329 -8:00 US P%sT 1946 330 -8:00 CA P%sT 1967 331 -8:00 US P%sT 332 333# Alaska 334# AK%sT is the modern abbreviation for -9:00 per USNO. 335# 336# From Paul Eggert (2001-05-30): 337# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 338# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 339# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 340# also a Friday. Include only the time zone part of this transition, 341# ignoring the switch from Julian to Gregorian, since we can't represent 342# the Julian calendar. 343# 344# As far as we know, none of the exact locations mentioned below were 345# permanently inhabited in 1867 by anyone using either calendar. 346# (Yakutat was colonized by the Russians in 1799, but the settlement 347# was destroyed in 1805 by a Yakutat-kon war party.) However, there 348# were nearby inhabitants in some cases and for our purposes perhaps 349# it's best to simply use the official transition. 350# 351# Zone NAME GMTOFF RULES FORMAT [UNTIL] 352Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 353 -8:57:41 - LMT 1900 Aug 20 12:00 354 -8:00 - PST 1942 355 -8:00 US P%sT 1946 356 -8:00 - PST 1969 357 -8:00 US P%sT 1983 Oct 30 2:00 358 -9:00 US Y%sT 1983 Nov 30 359 -9:00 US AK%sT 360Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 361 -9:18:55 - LMT 1900 Aug 20 12:00 362 -9:00 - YST 1942 363 -9:00 US Y%sT 1946 364 -9:00 - YST 1969 365 -9:00 US Y%sT 1983 Nov 30 366 -9:00 US AK%sT 367Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 368 -9:59:36 - LMT 1900 Aug 20 12:00 369 -10:00 - CAT 1942 370 -10:00 US CAT/CAWT 1946 371 -10:00 - CAT 1967 Apr 372 -10:00 - AHST 1969 373 -10:00 US AH%sT 1983 Oct 30 2:00 374 -9:00 US Y%sT 1983 Nov 30 375 -9:00 US AK%sT 376Zone America/Nome 12:58:21 - LMT 1867 Oct 18 377 -11:01:38 - LMT 1900 Aug 20 12:00 378 -11:00 - NST 1942 379 -11:00 US N%sT 1946 380 -11:00 - NST 1967 Apr 381 -11:00 - BST 1969 382 -11:00 US B%sT 1983 Oct 30 2:00 383 -9:00 US Y%sT 1983 Nov 30 384 -9:00 US AK%sT 385Zone America/Adak 12:13:21 - LMT 1867 Oct 18 386 -11:46:38 - LMT 1900 Aug 20 12:00 387 -11:00 - NST 1942 388 -11:00 US N%sT 1946 389 -11:00 - NST 1967 Apr 390 -11:00 - BST 1969 391 -11:00 US B%sT 1983 Oct 30 2:00 392 -10:00 US AH%sT 1983 Nov 30 393 -10:00 US HA%sT 394# The following switches don't quite make our 1970 cutoff. 395# 396# Shanks writes that part of southwest Alaska (e.g. Aniak) 397# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 398# and another part (e.g. Akiak) made the same switch five weeks later. 399# 400# From David Flater (2004-11-09): 401# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 402# Historic Preservation Commission, provided this information, which 403# suggests that Unalaska deviated from statutory time from early 1967 404# possibly until 1983: 405# 406# Minutes of the Unalaska City Council Meeting, January 10, 1967: 407# "Except for St. Paul and Akutan, Unalaska is the only important 408# location not on Alaska Standard Time. The following resolution was 409# made by William Robinson and seconded by Henry Swanson: Be it 410# resolved that the City of Unalaska hereby goes to Alaska Standard 411# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 412# January 14, Alaska Standard Time.) This resolution was passed with 413# three votes for and one against." 414 415# Hawaii 416# 417# From Arthur David Olson: 418# And then there's Hawaii. 419# DST was observed for one day in 1933; 420# standard time was changed by half an hour in 1947; 421# it's always standard as of 1986. 422# 423# From Paul Eggert: 424# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 425# 426Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 427 -10:30 - HST 1933 Apr 30 2:00 428 -10:30 1:00 HDT 1933 May 21 2:00 429 -10:30 US H%sT 1947 Jun 8 2:00 430 -10:00 - HST 431 432# Now we turn to US areas that have diverged from the consensus since 1970. 433 434# Arizona mostly uses MST. 435 436# From Paul Eggert (2002-10-20): 437# 438# The information in the rest of this paragraph is derived from the 439# <a href="http://www.dlapr.lib.az.us/links/daylight.htm"> 440# Daylight Saving Time web page (2002-01-23)</a> maintained by the 441# Arizona State Library, Archives and Public Records. 442# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 443# time, but by federal law railroads, airlines, bus lines, military 444# personnel, and some engaged in interstate commerce continued to 445# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 446# Gazette says that was the date the law changed, and that 04-01 was 447# the date the state's clocks would change. In 1945 the State of 448# Arizona used standard time all year, again with exceptions only as 449# mandated by federal law. Arizona observed DST in 1967, but Arizona 450# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 451# 452# Shanks says the 1944 experiment came to an end on 1944-03-17. 453# Go with the Arizona State Library instead. 454 455Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 456 -7:00 US M%sT 1944 Jan 1 00:01 457 -7:00 - MST 1944 Apr 1 00:01 458 -7:00 US M%sT 1944 Oct 1 00:01 459 -7:00 - MST 1967 460 -7:00 US M%sT 1968 Mar 21 461 -7:00 - MST 462# From Arthur David Olson (1988-02-13): 463# A writer from the Inter Tribal Council of Arizona, Inc., 464# notes in private correspondence dated 1987-12-28 that "Presently, only the 465# Navajo Nation participates in the Daylight Saving Time policy, due to its 466# large size and location in three states." (The "only" means that other 467# tribal nations don't use DST.) 468 469Link America/Denver America/Shiprock 470 471# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 472# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 473# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 474# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 475# Teton, Twin Falls, Valley, Washington counties) and eastern Oregon 476# switched four weeks late in 1974. 477# 478# Zone NAME GMTOFF RULES FORMAT [UNTIL] 479Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 480 -8:00 US P%sT 1923 May 13 2:00 481 -7:00 US M%sT 1974 482 -7:00 - MST 1974 Feb 3 2:00 483 -7:00 US M%sT 484 485# Indiana 486# 487# For a map of Indiana's time zone regions, see: 488# <a href="http://www.mccsc.edu/time.html"> 489# What time is it in Indiana? 490# </a> (2005-05-03) 491# 492# From Paul Eggert (2005-08-22): 493# Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 494# with the following exceptions: 495# 496# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 497# Vandenburgh, and Warrick counties have been like America/Chicago. 498# 499# - Dearborn and Ohio counties have been like America/New_York. 500# 501# - Clark, Floyd, and Harrison counties have been like 502# America/Kentucky/Louisville. 503# 504# - Crawford, Starke, and Switzerland counties have their own time zone 505# histories as noted below. 506# 507# Shanks partitions Indiana into 345 regions, each with its own time history, 508# and writes ``Even newspaper reports present contradictory information.'' 509# Fortunately, most of the complexity occurred before our cutoff date of 1970. 510# 511# Other than Indianapolis, the Indiana place names are so nondescript 512# that they would be ambiguous if we left them at the `America' level. 513# So we reluctantly put them all in a subdirectory `America/Indiana'. 514 515# From Paul Eggert (2005-08-16): 516# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006, 517# and that many counties may switch either to Central or to Eastern time. 518# The county-by-county decisions have not been made yet, so for now assume 519# that no counties will switch: this assumption is most likely wrong, 520# but it's the best we can do for now. 521 522# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 523Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 524Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 525Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 526# Zone NAME GMTOFF RULES FORMAT [UNTIL] 527Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 528 -6:00 US C%sT 1920 529 -6:00 Indianapolis C%sT 1942 530 -6:00 US C%sT 1946 531 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 532 -5:00 - EST 1957 Sep 29 2:00 533 -6:00 - CST 1958 Apr 27 2:00 534 -5:00 - EST 1969 535 -5:00 US E%sT 1971 536 -5:00 - EST 2006 537 -5:00 US E%sT 538# 539# Part of Crawford County, Indiana, last observed DST in 1975, 540# and left its clocks alone in 1974. 541# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 542Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 543Rule Marengo 1951 only - Sep lastSun 2:00 0 S 544Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 545Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 546# Zone NAME GMTOFF RULES FORMAT [UNTIL] 547Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 548 -6:00 US C%sT 1951 549 -6:00 Marengo C%sT 1961 Apr 30 2:00 550 -5:00 - EST 1969 551 -5:00 US E%sT 1974 Jan 6 2:00 552 -6:00 1:00 CDT 1974 Oct 27 2:00 553 -5:00 US E%sT 1976 554 -5:00 - EST 2006 555 -5:00 US E%sT 556# 557# Starke County, Indiana 558# From Arthur David Olson (1991-10-28): 559# An article on page A3 of the Sunday, 1991-10-27 Washington Post 560# notes that Starke County switched from Central time to Eastern time as of 561# 1991-10-27. 562# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 563Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 564Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 565Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 566Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 567Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 568# Zone NAME GMTOFF RULES FORMAT [UNTIL] 569Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 570 -6:00 US C%sT 1947 571 -6:00 Starke C%sT 1962 Apr 29 2:00 572 -5:00 - EST 1963 Oct 27 2:00 573 -6:00 US C%sT 1991 Oct 27 2:00 574 -5:00 - EST 2006 575 -5:00 US E%sT 576# 577# Switzerland County, Indiana, last observed DST in 1972. 578# Zone NAME GMTOFF RULES FORMAT [UNTIL] 579Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 580 -6:00 US C%sT 1954 Apr 25 2:00 581 -5:00 - EST 1969 582 -5:00 US E%sT 1973 583 -5:00 - EST 2006 584 -5:00 US E%sT 585 586# Part of Kentucky left its clocks alone in 1974. 587# This also includes Clark, Floyd, and Harrison counties in Indiana. 588# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 589Rule Louisville 1921 only - May 1 2:00 1:00 D 590Rule Louisville 1921 only - Sep 1 2:00 0 S 591Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 592Rule Louisville 1941 only - Sep lastSun 2:00 0 S 593Rule Louisville 1946 only - Jun 2 2:00 0 S 594Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 595Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 596# Zone NAME GMTOFF RULES FORMAT [UNTIL] 597Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 598 -6:00 US C%sT 1921 599 -6:00 Louisville C%sT 1942 600 -6:00 US C%sT 1946 601 -6:00 Louisville C%sT 1961 Jul 23 2:00 602 -5:00 - EST 1968 603 -5:00 US E%sT 1974 Jan 6 2:00 604 -6:00 1:00 CDT 1974 Oct 27 2:00 605 -5:00 US E%sT 606# 607# Wayne, Clinton, and Russell Counties, Kentucky 608# 609# From 610# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 611# Lake Cumberland LIFE 612# </a> (1999-01-29) via WKYM-101.7: 613# Clinton County has joined Wayne County in asking the DoT to change from 614# the Central to the Eastern time zone.... The Wayne County government made 615# the same request in December. And while Russell County officials have not 616# taken action, the majority of respondents to a poll conducted there in 617# August indicated they would like to change to "fast time" also. 618# The three Lake Cumberland counties are the farthest east of any U.S. 619# location in the Central time zone. 620# 621# From Rich Wales (2000-08-29): 622# After prolonged debate, and despite continuing deep differences of opinion, 623# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 624# (-0500) time. They won't "fall back" this year. See Sara Shipley, 625# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 626# 627# From Paul Eggert (2001-07-16): 628# The final rule was published in the 629# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> 630# Federal Register 65, 160 (2000-08-17), page 50154-50158. 631# </a> 632# 633Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 634 -6:00 US C%sT 1946 635 -6:00 - CST 1968 636 -6:00 US C%sT 2000 Oct 29 2:00 637 -5:00 US E%sT 638 639 640# From Rives McDow (2000-08-30): 641# Here ... are all the changes in the US since 1985. 642# Kearny County, KS (put all of county on central; 643# previously split between MST and CST) ... 1990-10 644# Starke County, IN (from CST to EST) ... 1991-10 645# Oliver County, ND (from MST to CST) ... 1992-10 646# West Wendover, NV (from PST TO MST) ... 1999-10 647# Wayne County, KY (from CST to EST) ... 2000-10 648# 649# From Paul Eggert (2001-07-17): 650# We don't know where the line used to be within Kearny County, KS, 651# so omit that change for now. 652# See America/Indiana/Knox for the Starke County, IN change. 653# See America/North_Dakota/Center for the Oliver County, ND change. 654# West Wendover, NV officially switched from Pacific to mountain time on 655# 1999-10-31. See the 656# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> 657# Federal Register 64, 203 (1999-10-21), page 56705-56707. 658# </a> 659# However, the Federal Register says that West Wendover already operated 660# on mountain time, and the rule merely made this official; 661# hence a separate tz entry is not needed. 662 663# Michigan 664# 665# From Bob Devine (1988-01-28): 666# Michigan didn't observe DST from 1968 to 1973. 667# 668# From Paul Eggert (1999-03-31): 669# Shanks writes that Michigan started using standard time on 1885-09-18, 670# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 671# that Detroit kept 672# 673# local time until 1900 when the City Council decreed that clocks should 674# be put back twenty-eight minutes to Central Standard Time. Half the 675# city obeyed, half refused. After considerable debate, the decision 676# was rescinded and the city reverted to Sun time. A derisive offer to 677# erect a sundial in front of the city hall was referred to the 678# Committee on Sewers. Then, in 1905, Central time was adopted 679# by city vote. 680# 681# This story is too entertaining to be false, so go with Howse over Shanks. 682# 683# From Paul Eggert (2001-03-06): 684# Garland (1927) writes ``Cleveland and Detroit advanced their clocks 685# one hour in 1914.'' This change is not in Shanks. We have no more 686# info, so omit this for now. 687# 688# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 689# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 690Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 691Rule Detroit 1948 only - Sep lastSun 2:00 0 S 692Rule Detroit 1967 only - Jun 14 2:00 1:00 D 693Rule Detroit 1967 only - Oct lastSun 2:00 0 S 694# Zone NAME GMTOFF RULES FORMAT [UNTIL] 695Zone America/Detroit -5:32:11 - LMT 1905 696 -6:00 - CST 1915 May 15 2:00 697 -5:00 - EST 1942 698 -5:00 US E%sT 1946 699 -5:00 Detroit E%sT 1973 700 -5:00 US E%sT 1975 701 -5:00 - EST 1975 Apr 27 2:00 702 -5:00 US E%sT 703# 704# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 705# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 706Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 707Rule Menominee 1946 only - Sep lastSun 2:00 0 S 708Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 709Rule Menominee 1966 only - Oct lastSun 2:00 0 S 710# Zone NAME GMTOFF RULES FORMAT [UNTIL] 711Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 712 -6:00 US C%sT 1946 713 -6:00 Menominee C%sT 1969 Apr 27 2:00 714 -5:00 - EST 1973 Apr 29 2:00 715 -6:00 US C%sT 716 717# Navassa 718# administered by the US Fish and Wildlife Service 719# claimed by US under the provisions of the 1856 Guano Islands Act 720# also claimed by Haiti 721# occupied 1857/1900 by the Navassa Phosphate Co 722# US lighthouse 1917/1996-09 723# currently uninhabited 724# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 725# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 726# Jimmy Skaggs, _The Great Guano Rush_ (1994). 727 728################################################################################ 729 730 731# From Paul Eggert (1999-10-29): 732# A good source for time zone historical data outside the US is 733# Thomas G. Shanks, The International Atlas (5th edition), 734# San Diego: ACS Publications, Inc. (1999). 735# 736# Gwillim Law writes that a good source 737# for recent time zone data is the International Air Transport 738# Association's Standard Schedules Information Manual (IATA SSIM), 739# published semiannually. Law sent in several helpful summaries 740# of the IATA's data after 1990. 741# 742# Except where otherwise noted, Shanks is the source for entries through 1990, 743# and IATA SSIM is the source for entries after 1990. 744# 745# Other sources occasionally used include: 746# 747# Edward W. Whitman, World Time Differences, 748# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 749# which I found in the UCLA library. 750# 751# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf"> 752# William Willett, The Waste of Daylight, 19th edition 753# </a> (1914-03) 754# 755# See the `europe' file for Greenland. 756 757# Canada 758 759# From Alain LaBont<e'> (1994-11-14): 760# I post here the time zone abbreviations standardized in Canada 761# for both English and French in the CAN/CSA-Z234.4-89 standard.... 762# 763# UTC Standard time Daylight savings time 764# offset French English French English 765# -2:30 - - HAT NDT 766# -3 - - HAA ADT 767# -3:30 HNT NST - - 768# -4 HNA AST HAE EDT 769# -5 HNE EST HAC CDT 770# -6 HNC CST HAR MDT 771# -7 HNR MST HAP PDT 772# -8 HNP PST HAY YDT 773# -9 HNY YST - - 774# 775# HN: Heure Normale ST: Standard Time 776# HA: Heure Avanc<e'>e DT: Daylight saving Time 777# 778# A: de l'Atlantique Atlantic 779# C: du Centre Central 780# E: de l'Est Eastern 781# M: Mountain 782# N: Newfoundland 783# P: du Pacifique Pacific 784# R: des Rocheuses 785# T: de Terre-Neuve 786# Y: du Yukon Yukon 787# 788# From Paul Eggert (1994-11-22): 789# Alas, this sort of thing must be handled by localization software. 790 791# Unless otherwise specified, the data for Canada are all from Shanks. 792 793# From Paul Eggert (2000-10-02): 794# H. David Matthews and Mary Vincent's map 795# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm"> 796# "It's about TIME", _Canadian Geographic_ (September-October 1998) 797# </a> contains detailed boundaries for regions observing nonstandard 798# time and daylight saving time arrangements in Canada circa 1998. 799# 800# INMS, the Institute for National Measurement Standards in Ottawa, has 801# <a href="http://www.nrc.ca/inms/time/tze.html"> 802# information about standard and daylight saving time zones in Canada. 803# </a> (updated periodically). 804# Its unofficial information is often taken from Matthews and Vincent. 805 806# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 807Rule Canada 1918 only - Apr 14 2:00 1:00 D 808Rule Canada 1918 only - Oct 31 2:00 0 S 809Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 810Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 811Rule Canada 1945 only - Sep 30 2:00 0 S 812Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 813Rule Canada 1974 max - Oct lastSun 2:00 0 S 814Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 815 816 817# Newfoundland (and far southeast Labrador) 818 819# From Paul Eggert (2000-10-02): 820# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 821# but the only part of Labrador that follows the rules is the 822# southeast corner, including Port Hope Simpson and Mary's Harbour, 823# but excluding, say, Black Tickle. 824 825# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 826Rule StJohns 1917 only - Apr 8 2:00 1:00 D 827Rule StJohns 1917 only - Sep 17 2:00 0 S 828# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 829Rule StJohns 1919 only - May 5 23:00 1:00 D 830Rule StJohns 1919 only - Aug 12 23:00 0 S 831# For 1931-1935 Whitman gives Apr same date; go with Shanks. 832Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 833Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 834# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks. 835Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 836Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 837# Whitman gives the following transitions: 838# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 839# but go with Shanks and assume they used Canadian rules. 840# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 841# Apr 30 - Sep 24; go with Shanks. 842Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 843Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 844Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 845Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 846Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 847# From Paul Eggert (2000-10-02): 848# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 849# at 00:01 local time. For now, assume it started in 1987. 850Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 851Rule StJohns 1987 max - Oct lastSun 0:01 0 S 852Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 853Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D 854# St John's has an apostrophe, but Posix file names can't have apostrophes. 855# Zone NAME GMTOFF RULES FORMAT [UNTIL] 856Zone America/St_Johns -3:30:52 - LMT 1884 857 -3:30:52 StJohns N%sT 1918 858 -3:30:52 Canada N%sT 1919 859 -3:30:52 StJohns N%sT 1935 Mar 30 860 -3:30 StJohns N%sT 1942 May 11 861 -3:30 Canada N%sT 1946 862 -3:30 StJohns N%sT 863 864# most of east Labrador 865 866# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 867# Zone NAME GMTOFF RULES FORMAT [UNTIL] 868Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 869 -3:30:52 - NST 1918 870 -3:30:52 Canada N%sT 1919 871 -3:30:52 - NST 1935 Mar 30 872 -3:30 - NST 1936 873 -3:30 StJohns N%sT 1942 May 11 874 -3:30 Canada N%sT 1946 875 -3:30 StJohns N%sT 1966 Mar 15 2:00 876 -4:00 StJohns A%sT 877 878 879# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 880 881# From Paul Eggert (1996-06-12): 882# Shanks writes that since 1970 most of this region has been like Halifax. 883# Many locales did not observe peacetime DST until 1972; 884# Glace Bay, NS is the largest that we know of. 885# Shanks also writes that Liverpool, NS was the only town in Canada to observe 886# DST in 1971 but not 1970; for now we'll assume this is a typo. 887 888# From Paul Eggert (2000-10-02): 889# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches 890# at 00:01 local time. FIXME: verify and create a new Zone for this. 891 892 893# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 894Rule Halifax 1916 only - Apr 1 0:00 1:00 D 895Rule Halifax 1916 only - Oct 1 0:00 0 S 896Rule Halifax 1920 only - May 9 0:00 1:00 D 897Rule Halifax 1920 only - Aug 29 0:00 0 S 898Rule Halifax 1921 only - May 6 0:00 1:00 D 899Rule Halifax 1921 1922 - Sep 5 0:00 0 S 900Rule Halifax 1922 only - Apr 30 0:00 1:00 D 901Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 902Rule Halifax 1923 only - Sep 4 0:00 0 S 903Rule Halifax 1924 only - Sep 15 0:00 0 S 904Rule Halifax 1925 only - Sep 28 0:00 0 S 905Rule Halifax 1926 only - May 16 0:00 1:00 D 906Rule Halifax 1926 only - Sep 13 0:00 0 S 907Rule Halifax 1927 only - May 1 0:00 1:00 D 908Rule Halifax 1927 only - Sep 26 0:00 0 S 909Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 910Rule Halifax 1928 only - Sep 9 0:00 0 S 911Rule Halifax 1929 only - Sep 3 0:00 0 S 912Rule Halifax 1930 only - Sep 15 0:00 0 S 913Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 914Rule Halifax 1932 only - May 1 0:00 1:00 D 915Rule Halifax 1933 only - Apr 30 0:00 1:00 D 916Rule Halifax 1933 only - Oct 2 0:00 0 S 917Rule Halifax 1934 only - May 20 0:00 1:00 D 918Rule Halifax 1934 only - Sep 16 0:00 0 S 919Rule Halifax 1935 only - Jun 2 0:00 1:00 D 920Rule Halifax 1935 only - Sep 30 0:00 0 S 921Rule Halifax 1936 only - Jun 1 0:00 1:00 D 922Rule Halifax 1936 only - Sep 14 0:00 0 S 923Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 924Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 925Rule Halifax 1939 only - May 28 0:00 1:00 D 926Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 927Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 928Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 929Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 930Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 931Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 932Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 933Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 934Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 935# Zone NAME GMTOFF RULES FORMAT [UNTIL] 936Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 937 -4:00 Halifax A%sT 1918 938 -4:00 Canada A%sT 1919 939 -4:00 Halifax A%sT 1942 Feb 9 2:00s 940 -4:00 Canada A%sT 1946 941 -4:00 Halifax A%sT 1974 942 -4:00 Canada A%sT 943Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 944 -4:00 Canada A%sT 1953 945 -4:00 Halifax A%sT 1954 946 -4:00 - AST 1972 947 -4:00 Halifax A%sT 1974 948 -4:00 Canada A%sT 949 950 951# Ontario, Quebec 952 953# From Paul Eggert (1996-06-12): 954# Shanks writes that since 1970 most of Ontario has been like Toronto, 955# and most of Quebec has been like Montreal. 956# Thunder Bay skipped DST in 1973. 957# Many smaller locales did not observe peacetime DST until 1974; 958# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 959# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 960 961# From Mark Brader (2003-07-26): 962# [According to the Toronto Star] Orillia, Ontario, adopted DST 963# effective Saturday, 1912-06-22, 22:00; the article mentions that 964# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 965# have already done so. In Orillia DST was to run until Saturday, 966# 1912-08-31 (no time mentioned), but it was met with considerable 967# hostility from certain segments of the public, and was revoked after 968# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but 969# presumably that should be -07-06. (1912-06-19, -07-12; also letters 970# earlier in June). 971# 972# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 973 974# From Paul Eggert (1997-10-17): 975# Mark Brader writes that an article in the 1997-10-14 Toronto Star 976# says that Atikokan, Ontario currently does not observe DST, 977# but will vote on 11-10 whether to use EST/EDT. 978# He also writes that the 979# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 980# Ontario Time Act (1990, Chapter T.9) 981# </a> 982# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 983# Officially Atikokan is therefore on CST/CDT, and most likely this report 984# concerns a non-official time observed as a matter of local practice. 985# For what it's worth, Shanks says that Atikokan has agreed with 986# Rainy River ever since standard time was introduced. 987 988# From Paul Eggert (2000-10-02): 989# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 990# New Osnaburgh observe CST all year, that Big Trout Lake observes 991# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 992# violation of the official Ontario rules. 993# They also write that Quebec east of the -63 meridian is supposed to 994# observe AST, but residents as far east as Natashquan use EST/EDT, 995# and residents east of Natashquan use AST. 996# We probably need Zones for far east Quebec and for Atikokan, 997# but we don't know when their practices started. 998 999# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1000Rule Mont 1917 only - Mar 25 2:00 1:00 D 1001Rule Mont 1917 only - Apr 24 0:00 0 S 1002Rule Mont 1919 only - Mar 31 2:30 1:00 D 1003Rule Mont 1919 only - Oct 25 2:30 0 S 1004Rule Mont 1920 only - May 2 2:30 1:00 D 1005Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S 1006Rule Mont 1921 only - May 1 2:00 1:00 D 1007Rule Mont 1922 only - Apr 30 2:00 1:00 D 1008Rule Mont 1924 only - May 17 2:00 1:00 D 1009Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 1010Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 1011# The 1927-to-1937 rules can be expressed more simply as 1012# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D 1013# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S 1014# The rules below avoid use of 24:00 1015# (which pre-1998 versions of zic cannot handle). 1016Rule Mont 1927 only - May 1 0:00 1:00 D 1017Rule Mont 1927 1932 - Sep lastSun 0:00 0 S 1018Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D 1019Rule Mont 1932 only - May 1 0:00 1:00 D 1020Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D 1021Rule Mont 1933 only - Oct 1 0:00 0 S 1022Rule Mont 1934 1939 - Sep lastSun 0:00 0 S 1023Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D 1024Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 1025Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 1026Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 1027Rule Mont 1957 1973 - Oct lastSun 2:00 0 S 1028 1029Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1030Rule Toronto 1919 only - Oct 26 0:00 0 S 1031Rule Toronto 1920 only - May 2 2:00 1:00 D 1032Rule Toronto 1920 only - Sep 26 0:00 0 S 1033Rule Toronto 1921 only - May 15 2:00 1:00 D 1034Rule Toronto 1921 only - Sep 15 2:00 0 S 1035Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1036# Shanks says 1923-09-19; assume it's a typo and that "-16" was meant. 1037Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1038Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1039# The 1927-to-1939 rules can be expressed more simply as 1040# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1041# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1042# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1043# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1044# The rules below avoid use of Sun>=25 1045# (which pre-2004 versions of zic cannot handle). 1046Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1047Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1048Rule Toronto 1932 only - May 1 2:00 1:00 D 1049Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1050Rule Toronto 1933 only - Oct 1 2:00 0 S 1051Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1052Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1053Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1054Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1055Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1056Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1057Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1058Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1059Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1060# Shanks says Toronto ended DST a week early in 1971, namely on 1971-10-24, 1061# but Mark Brader wrote (2003-05-31) that he checked the 1971-10-30 issue 1062# of the Toronto Star, and it said that DST ended 1971-10-31 as usual. 1063Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1064 1065# From Paul Eggert (2003-07-27): 1066# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1067# Port Arthur, Ontario, the principle of the Bill has been in 1068# operation for the past three years, and in the City of Moose Jaw, 1069# Saskatchewan, for one year." 1070 1071# From David Bryan via Tory Tronrud, Director/Curator, 1072# Thunder Bay Museum (2003-11-12): 1073# There is some suggestion, however, that, by-law or not, daylight 1074# savings time was being practiced in Fort William and Port Arthur 1075# before 1909.... [I]n 1910, the line between the Eastern and Central 1076# Time Zones was permanently moved about two hundred miles west to 1077# include the Thunder Bay area.... When Canada adopted daylight 1078# savings time in 1916, Fort William and Port Arthur, having done so 1079# already, did not change their clocks.... During the Second World 1080# War,... [t]he cities agreed to implement DST during the summer 1081# months for the remainder of the war years. 1082 1083# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1084Zone America/Montreal -4:54:16 - LMT 1884 1085 -5:00 Mont E%sT 1918 1086 -5:00 Canada E%sT 1919 1087 -5:00 Mont E%sT 1942 Feb 9 2:00s 1088 -5:00 Canada E%sT 1946 1089 -5:00 Mont E%sT 1974 1090 -5:00 Canada E%sT 1091Zone America/Toronto -5:17:32 - LMT 1895 1092 -5:00 Canada E%sT 1919 1093 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1094 -5:00 Canada E%sT 1946 1095 -5:00 Toronto E%sT 1974 1096 -5:00 Canada E%sT 1097Zone America/Thunder_Bay -5:57:00 - LMT 1895 1098 -6:00 - CST 1910 1099 -5:00 - EST 1942 1100 -5:00 Canada E%sT 1970 1101 -5:00 Mont E%sT 1973 1102 -5:00 - EST 1974 1103 -5:00 Canada E%sT 1104Zone America/Nipigon -5:53:04 - LMT 1895 1105 -5:00 Canada E%sT 1940 Sep 29 1106 -5:00 1:00 EDT 1942 Feb 9 2:00s 1107 -5:00 Canada E%sT 1108Zone America/Rainy_River -6:17:56 - LMT 1895 1109 -6:00 Canada C%sT 1940 Sep 29 1110 -6:00 1:00 CDT 1942 Feb 9 2:00s 1111 -6:00 Canada C%sT 1112 1113 1114# Manitoba 1115 1116# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1117Rule Winn 1916 only - Apr 23 0:00 1:00 D 1118Rule Winn 1916 only - Sep 17 0:00 0 S 1119Rule Winn 1918 only - Apr 14 2:00 1:00 D 1120Rule Winn 1918 only - Oct 31 2:00 0 S 1121Rule Winn 1937 only - May 16 2:00 1:00 D 1122Rule Winn 1937 only - Sep 26 2:00 0 S 1123Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1124Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1125Rule Winn 1945 only - Sep lastSun 2:00 0 S 1126Rule Winn 1946 only - May 12 2:00 1:00 D 1127Rule Winn 1946 only - Oct 13 2:00 0 S 1128Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1129Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1130Rule Winn 1950 only - May 1 2:00 1:00 D 1131Rule Winn 1950 only - Sep 30 2:00 0 S 1132Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1133Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1134Rule Winn 1959 only - Oct lastSun 2:00 0 S 1135Rule Winn 1960 only - Sep lastSun 2:00 0 S 1136Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1137Rule Winn 1963 only - Sep 22 2:00 0 S 1138Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 1139Rule Winn 1966 1986 - Oct lastSun 2:00 0 S 1140Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 1141# From Paul Eggert (2000-10-02): 1142# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from 1143# DST at 03:00 local time. For now, assume it started in 1987. 1144Rule Winn 1987 max - Oct lastSun 2:00s 0 S 1145# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1146Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1147 -6:00 Winn C%sT 1148 1149 1150# Saskatchewan 1151 1152# From Mark Brader (2003-07-26): 1153# The first actual adoption of DST in Canada was at the municipal 1154# level. As the [Toronto] Star put it (1912-06-07), "While people 1155# elsewhere have long been talking of legislation to save daylight, 1156# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1157# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1158# presumably late evening, as below), and would run until "the end of 1159# the summer". The discrepancy between municipal time and railroad 1160# time was noted. 1161 1162# From Paul Eggert (2003-07-27): 1163# Willett (1914-03) notes that DST "has been in operation ... in the 1164# City of Moose Jaw, Saskatchewan, for one year." 1165 1166# From Paul Eggert (2000-10-02): 1167# Shanks writes that since 1970 most of this region has been like Regina. 1168# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1169# Other western towns (e.g. Lloydminster) are like Edmonton. 1170# Matthews and Vincent (1998) write that Denare Beach and Creighton 1171# are like Winnipeg, in violation of Saskatchewan law. 1172 1173# From W. Jones (1992-11-06): 1174# The. . .below is based on information I got from our law library, the 1175# provincial archives, and the provincial Community Services department. 1176# A precise history would require digging through newspaper archives, and 1177# since you didn't say what you wanted, I didn't bother. 1178# 1179# Saskatchewan is split by a time zone meridian (105W) and over the years 1180# the boundary became pretty ragged as communities near it reevaluated 1181# their affiliations in one direction or the other. In 1965 a provincial 1182# referendum favoured legislating common time practices. 1183# 1184# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1185# Saskatchewan 1978) was proclaimed, and established that the eastern 1186# part of Saskatchewan would use CST year round, that districts in 1187# northwest Saskatchewan would by default follow CST but could opt to 1188# follow Mountain Time rules (thus 1 hour difference in the winter and 1189# zero in the summer), and that districts in southwest Saskatchewan would 1190# by default follow MT but could opt to follow CST. 1191# 1192# It took a few years for the dust to settle (I know one story of a town 1193# on one time zone having its school in another, such that a mom had to 1194# serve her family lunch in two shifts), but presently it seems that only 1195# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1196# rules any more; all other districts appear to have used CST year round 1197# since sometime in the 1960s. 1198 1199# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1200Rule Regina 1918 only - Apr 14 2:00 1:00 D 1201Rule Regina 1918 only - Oct 31 2:00 0 S 1202Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1203Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1204Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1205Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1206Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1207Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1208Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1209Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1210Rule Regina 1945 only - Sep lastSun 2:00 0 S 1211Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1212Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1213Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1214Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1215Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1216Rule Regina 1959 only - Oct lastSun 2:00 0 S 1217# 1218Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1219Rule Swift 1957 only - Oct lastSun 2:00 0 S 1220Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1221Rule Swift 1959 only - Oct lastSun 2:00 0 S 1222Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1223# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1224Zone America/Regina -6:58:36 - LMT 1905 Sep 1225 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1226 -6:00 - CST 1227Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1228 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1229 -7:00 Regina M%sT 1950 1230 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1231 -6:00 - CST 1232 1233 1234# Alberta 1235 1236# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1237Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1238Rule Edm 1918 only - Oct 31 2:00 0 S 1239Rule Edm 1919 only - May 27 2:00 0 S 1240Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1241Rule Edm 1920 only - Oct lastSun 2:00 0 S 1242Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1243Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1244Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1245Rule Edm 1945 only - Sep lastSun 2:00 0 S 1246Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1247Rule Edm 1947 only - Sep lastSun 2:00 0 S 1248Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1249Rule Edm 1967 only - Oct lastSun 2:00 0 S 1250Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1251Rule Edm 1969 only - Oct lastSun 2:00 0 S 1252Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1253Rule Edm 1972 max - Oct lastSun 2:00 0 S 1254Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 1255# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1256Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1257 -7:00 Edm M%sT 1258 1259 1260# British Columbia 1261 1262# From Paul Eggert (2000-10-02): 1263# Shanks writes that since 1970 most of this region has been like Vancouver. 1264# Dawson Creek uses MST. Much of east BC is like Edmonton. 1265# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1266 1267# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1268Rule Vanc 1918 only - Apr 14 2:00 1:00 D 1269Rule Vanc 1918 only - Oct 31 2:00 0 S 1270Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 1271Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 1272Rule Vanc 1945 only - Sep 30 2:00 0 S 1273Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 1274Rule Vanc 1946 only - Oct 13 2:00 0 S 1275Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 1276Rule Vanc 1962 max - Oct lastSun 2:00 0 S 1277Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 1278# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1279Zone America/Vancouver -8:12:28 - LMT 1884 1280 -8:00 Vanc P%sT 1281Zone America/Dawson_Creek -8:00:56 - LMT 1884 1282 -8:00 Canada P%sT 1947 1283 -8:00 Vanc P%sT 1972 Aug 30 2:00 1284 -7:00 - MST 1285 1286 1287# Northwest Territories, Nunavut, Yukon 1288 1289# From Paul Eggert (1999-10-29): 1290# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 1291# Mathew Englander (1996-10-07) gives the following refs: 1292# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 1293# c. 7 defines Yukon standard time as UTC-9. This is still valid; 1294# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 1295# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 1296# * O.I.C. 1980/02 established DST. 1297# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 1298# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 1299 1300# From Rives McDow (1999-09-04): 1301# Nunavut ... moved ... to incorporate the whole territory into one time zone. 1302# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 1303# Nunavut moves to single time zone Oct. 31 1304# </a> 1305# 1306# From Antoine Leca (1999-09-06): 1307# We then need to create a new timezone for the Kitikmeot region of Nunavut 1308# to differentiate it from the Yellowknife region. 1309 1310# From Paul Eggert (1999-09-20): 1311# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 1312# Basic Facts: The New Territory 1313# </a> (1999) reports that Pangnirtung operates on eastern time, 1314# and that Coral Harbour does not observe DST. We don't know when 1315# Pangnirtung switched to eastern time; we'll guess 1995. 1316 1317# From Rives McDow (1999-11-08): 1318# On October 31, when the rest of Nunavut went to Central time, 1319# Pangnirtung wobbled. Here is the result of their wobble: 1320# 1321# The following businesses and organizations in Pangnirtung use Central Time: 1322# 1323# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 1324# Eastern Arctic National Parks, A & D Specialist 1325# 1326# The following businesses and organizations in Pangnirtung use Eastern Time: 1327# 1328# Hamlet office, All other businesses, Both schools, Airport operator 1329# 1330# This has made for an interesting situation there, which warranted the news. 1331# No one there that I spoke with seems concerned, or has plans to 1332# change the local methods of keeping time, as it evidently does not 1333# really interfere with any activities or make things difficult locally. 1334# They plan to celebrate New Year's turn-over twice, one hour apart, 1335# so it appears that the situation will last at least that long. 1336# The Nunavut Intergovernmental Affairs hopes that they will "come to 1337# their senses", but the locals evidently don't see any problem with 1338# the current state of affairs. 1339 1340# From Michaela Rodrigue, writing in the 1341# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 1342# Nunatsiaq News (1999-11-19)</a>: 1343# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 1344# central - or Nunavut time - for government offices, and eastern time 1345# for municipal offices and schools.... Igloolik [was similar but then] 1346# made the switch to central time on Saturday, Nov. 6. 1347 1348# From Paul Eggert (2000-10-02): 1349# Matthews and Vincent (1998) say the following, but we lack histories 1350# for these potential new Zones. 1351# 1352# The Canadian Forces station at Alert uses Eastern Time while the 1353# handful of residents at the Eureka weather station [in the Central 1354# zone] skip daylight savings. Baffin Island, which is crossed by the 1355# Central, Eastern and Atlantic Time zones only uses Eastern Time. 1356# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 1357# Central Time and Southampton Island [in the Central zone] is not 1358# required to use daylight savings. 1359 1360# From 1361# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> 1362# Nunavut now has two time zones 1363# </a> (2000-11-10): 1364# The Nunavut government would allow its employees in Kugluktuk and 1365# Cambridge Bay to operate on central time year-round, putting them 1366# one hour behind the rest of Nunavut for six months during the winter. 1367# At the end of October the two communities had rebelled against 1368# Nunavut's unified time zone, refusing to shift to eastern time with 1369# the rest of the territory for the winter. Cambridge Bay remained on 1370# central time, while Kugluktuk, even farther west, reverted to 1371# mountain time, which they had used before the advent of Nunavut's 1372# unified time zone in 1999. 1373# 1374# From Rives McDow (2001-01-20), quoting the Nunavut government: 1375# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 1376 1377# From Paul Eggert (2000-12-04): 1378# Let's just keep track of the official times for now. 1379 1380# From Rives McDow (2001-03-07): 1381# The premier of Nunavut has issued a ministerial statement advising 1382# that effective 2001-04-01, the territory of Nunavut will revert 1383# back to three time zones (mountain, central, and eastern). Of the 1384# cities in Nunavut, Coral Harbor is the only one that I know of that 1385# has said it will not observe dst, staying on EST year round. I'm 1386# checking for more info, and will get back to you if I come up with 1387# more. 1388# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 1389 1390# From Gwillim Law (2005-05-21): 1391# According to maps at 1392# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg 1393# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg 1394# (both dated 2003), and 1395# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 1396# (from a 1998 Canadian Geographic article), the de facto and de jure time 1397# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 1398# round. Using Google, it's easy to find other websites that confirm this. 1399# I wasn't able to find how far back this time regimen goes, but since it 1400# predates the creation of Nunavut, it probably goes back many years.... 1401# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 1402# 1403# From Paul Eggert (2005-07-26): 1404# For lack of better information, assume that Southampton Island observed 1405# daylight saving only during wartime. 1406 1407# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1408Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 1409Rule NT_YK 1918 only - Oct 27 2:00 0 S 1410Rule NT_YK 1919 only - May 25 2:00 1:00 D 1411Rule NT_YK 1919 only - Nov 1 0:00 0 S 1412Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 1413Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 1414Rule NT_YK 1945 only - Sep 30 2:00 0 S 1415Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 1416Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 1417Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 1418Rule NT_YK 1980 max - Oct lastSun 2:00 0 S 1419Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 1420# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1421Zone America/Pangnirtung -4:22:56 - LMT 1884 1422 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 1423 -5:00 Canada E%sT 1999 Oct 31 2:00 1424 -6:00 Canada C%sT 2000 Oct 29 2:00 1425 -5:00 Canada E%sT 1426Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 1427 -5:00 NT_YK E%sT 1999 Oct 31 2:00 1428 -6:00 Canada C%sT 2000 Oct 29 2:00 1429 -5:00 Canada E%sT 1430Zone America/Coral_Harbour -5:32:40 - LMT 1884 1431 -5:00 NT_YK E%sT 1946 1432 -5:00 - EST 1433Zone America/Rankin_Inlet -6:08:40 - LMT 1884 1434 -6:00 NT_YK C%sT 2000 Oct 29 2:00 1435 -5:00 - EST 2001 Apr 1 3:00 1436 -6:00 Canada C%sT 1437Zone America/Cambridge_Bay -7:00:20 - LMT 1884 1438 -7:00 NT_YK M%sT 1999 Oct 31 2:00 1439 -6:00 Canada C%sT 2000 Oct 29 2:00 1440 -5:00 - EST 2000 Nov 5 0:00 1441 -6:00 - CST 2001 Apr 1 3:00 1442 -7:00 Canada M%sT 1443Zone America/Yellowknife -7:37:24 - LMT 1884 1444 -7:00 NT_YK M%sT 1445Zone America/Inuvik -8:54:00 - LMT 1884 1446 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 1447 -7:00 NT_YK M%sT 1448Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 1449 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 1450 -8:00 NT_YK P%sT 1451Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 1452 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 1453 -8:00 NT_YK P%sT 1454 1455 1456############################################################################### 1457 1458# Mexico 1459 1460# From Paul Eggert (2001-03-05): 1461# The Investigation and Analysis Service of the 1462# Mexican Library of Congress (MLoC) has published a 1463# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> 1464# history of Mexican local time (in Spanish) 1465# </a>. 1466# 1467# Here are the discrepancies between Shanks and the MLoC. 1468# (In all cases we go with the MLoC.) 1469# Shanks reports that Baja was at -8:00 in 1922/1923. 1470# Shanks says the 1930 transition in Baja was 1930-11-16. 1471# Shanks reports no DST during summer 1931. 1472# Shanks reports a transition at 1932-03-30 23:00, not 1932-04-01. 1473# Shanks does not report transitions for Baja in 1945 or 1948. 1474# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23. 1475# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00 1476# on 1997-10-26 at 02:00. 1477 1478# From Gwillim Law (2001-02-20): 1479# There are some other discrepancies between the Decrees page and the 1480# tz database. I think they can best be explained by supposing that 1481# the researchers who prepared the Decrees page failed to find some of 1482# the relevant documents. 1483 1484# From Paul Eggert (2000-07-26): 1485# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 1486# and 1988 DST experiments. Go with spin.com.mx. 1487 1488# From Alan Perry (1996-02-15): 1489# A guy from our Mexico subsidiary finally found the Presidential Decree 1490# outlining the timezone changes in Mexico. 1491# 1492# ------------- Begin Forwarded Message ------------- 1493# 1494# I finally got my hands on the Official Presidential Decree that sets up the 1495# rules for the DST changes. The rules are: 1496# 1497# 1. The country is divided in 3 timezones: 1498# - Baja California Norte (the Mexico/BajaNorte TZ) 1499# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 1500# - The rest of the country (the Mexico/General TZ) 1501# 1502# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 1503# at 2:00 AM, the times in each zone are as follows: 1504# BajaNorte: GMT+7 1505# BajaSur: GMT+6 1506# General: GMT+5 1507# 1508# 3. The rest of the year, the times are as follows: 1509# BajaNorte: GMT+8 1510# BajaSur: GMT+7 1511# General: GMT+6 1512# 1513# The Decree was published in Mexico's Official Newspaper on January 4th. 1514# 1515# -------------- End Forwarded Message -------------- 1516# From Paul Eggert (1996-06-12): 1517# For an English translation of the decree, see 1518# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 1519# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 1520# </a> 1521 1522# From Rives McDow (1998-10-08): 1523# The State of Quintana Roo has reverted back to central STD and DST times 1524# (i.e. UTC -0600 and -0500 as of 1998-08-02). 1525 1526# From Rives McDow (2000-01-10): 1527# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 1528# zone 5 hours from the International Date Line, and will not observe daylight 1529# savings time so as to stay on the same time zone as the southern part of 1530# Arizona year round. 1531 1532# From Jesper Norgaard, translating 1533# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 1534# In Oaxaca, the 55.000 teachers from the Section 22 of the National 1535# Syndicate of Education Workers, refuse to apply daylight saving each 1536# year, so that the more than 10,000 schools work at normal hour the 1537# whole year. 1538 1539# From Gwillim Law (2001-01-19): 1540# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 1541# (translated):... 1542# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 1543# that Summer Time will be reduced from seven to five months, starting 1544# this year.... 1545# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> 1546# [translated], says "summer time will ... take effect on the first Sunday 1547# in May, and end on the last Sunday of September. 1548 1549# From Arthur David Olson (2001-01-25): 1550# The 2001-01-24 traditional Washington Post contained the page one 1551# story "Timely Issue Divides Mexicans."... 1552# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 1553# ... Mexico City Mayor Lopez Obrador "...is threatening to keep 1554# Mexico City and its 20 million residents on a different time than 1555# the rest of the country..." In particular, Lopez Obrador would abolish 1556# observation of Daylight Saving Time. 1557 1558# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> 1559# Official statute published by the Energy Department 1560# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 1561# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). 1562 1563# From Paul Eggert (2001-03-03): 1564# 1565# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> 1566# James F. Smith writes in today's LA Times 1567# </a> 1568# * Sonora will continue to observe standard time. 1569# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that 1570# the Federal District will not adopt DST. 1571# * 4 of 16 district leaders announced they'll ignore the decree. 1572# * The decree does not affect federal-controlled facilities including 1573# the airport, banks, hospitals, and schools. 1574# 1575# For now we'll assume that the Federal District will bow to federal rules. 1576 1577# From Jesper Norgaard (2001-04-01): 1578# I found some references to the Mexican application of daylight 1579# saving, which modifies what I had already sent you, stating earlier 1580# that a number of northern Mexican states would go on daylight 1581# saving. The modification reverts this to only cover Baja California 1582# (Norte), while all other states (except Sonora, who has no daylight 1583# saving all year) will follow the original decree of president 1584# Vicente Fox, starting daylight saving May 6, 2001 and ending 1585# September 30, 2001. 1586# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> 1587# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 1588 1589# From Reuters (2001-09-04): 1590# Mexico's Supreme Court on Tuesday declared that daylight savings was 1591# unconstitutional in Mexico City, creating the possibility the 1592# capital will be in a different time zone from the rest of the nation 1593# next year.... The Supreme Court's ruling takes effect at 2:00 1594# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 1595# standard time. "This is so residents of the Federal District are not 1596# subject to unexpected time changes," a statement from the court said. 1597 1598# From Jesper Norgaard Welen (2002-03-12): 1599# ... consulting my local grocery store(!) and my coworkers, they all insisted 1600# that a new decision had been made to reinstate US style DST in Mexico.... 1601# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 1602# confirms this. Sonora as usual is the only state where DST is not applied. 1603 1604# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1605Rule Mexico 1939 only - Feb 5 0:00 1:00 D 1606Rule Mexico 1939 only - Jun 25 0:00 0 S 1607Rule Mexico 1940 only - Dec 9 0:00 1:00 D 1608Rule Mexico 1941 only - Apr 1 0:00 0 S 1609Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 1610Rule Mexico 1944 only - May 1 0:00 0 S 1611Rule Mexico 1950 only - Feb 12 0:00 1:00 D 1612Rule Mexico 1950 only - Jul 30 0:00 0 S 1613Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 1614Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 1615Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 1616Rule Mexico 2001 only - Sep lastSun 2:00 0 S 1617Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 1618Rule Mexico 2002 max - Oct lastSun 2:00 0 S 1619# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1620# Quintana Roo 1621Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 1622 -6:00 - CST 1981 Dec 23 1623 -5:00 Mexico E%sT 1998 Aug 2 2:00 1624 -6:00 Mexico C%sT 1625# Campeche, Yucatan 1626Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 1627 -6:00 - CST 1981 Dec 23 1628 -5:00 - EST 1982 Dec 2 1629 -6:00 Mexico C%sT 1630# Coahuila, Durango, Nuevo Leon, Tamaulipas 1631Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 1632 -6:00 - CST 1988 1633 -6:00 US C%sT 1989 1634 -6:00 Mexico C%sT 1635# Central Mexico 1636Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 1637 -7:00 - MST 1927 Jun 10 23:00 1638 -6:00 - CST 1930 Nov 15 1639 -7:00 - MST 1931 May 1 23:00 1640 -6:00 - CST 1931 Oct 1641 -7:00 - MST 1932 Apr 1 1642 -6:00 Mexico C%sT 2001 Sep 30 02:00 1643 -6:00 - CST 2002 Feb 20 1644 -6:00 Mexico C%sT 1645# Chihuahua 1646Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 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 - CST 1996 1653 -6:00 Mexico C%sT 1998 1654 -6:00 - CST 1998 Apr Sun>=1 3:00 1655 -7:00 Mexico M%sT 1656# Sonora 1657Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 1658 -7:00 - MST 1927 Jun 10 23:00 1659 -6:00 - CST 1930 Nov 15 1660 -7:00 - MST 1931 May 1 23:00 1661 -6:00 - CST 1931 Oct 1662 -7:00 - MST 1932 Apr 1 1663 -6:00 - CST 1942 Apr 24 1664 -7:00 - MST 1949 Jan 14 1665 -8:00 - PST 1970 1666 -7:00 Mexico M%sT 1999 1667 -7:00 - MST 1668# Baja California Sur, Nayarit, Sinaloa 1669Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 1670 -7:00 - MST 1927 Jun 10 23:00 1671 -6:00 - CST 1930 Nov 15 1672 -7:00 - MST 1931 May 1 23:00 1673 -6:00 - CST 1931 Oct 1674 -7:00 - MST 1932 Apr 1 1675 -6:00 - CST 1942 Apr 24 1676 -7:00 - MST 1949 Jan 14 1677 -8:00 - PST 1970 1678 -7:00 Mexico M%sT 1679# Baja California 1680Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 1681 -7:00 - MST 1924 1682 -8:00 - PST 1927 Jun 10 23:00 1683 -7:00 - MST 1930 Nov 15 1684 -8:00 - PST 1931 Apr 1 1685 -8:00 1:00 PDT 1931 Sep 30 1686 -8:00 - PST 1942 Apr 24 1687 -8:00 1:00 PWT 1945 Nov 12 1688 -8:00 - PST 1948 Apr 5 1689 -8:00 1:00 PDT 1949 Jan 14 1690 -8:00 - PST 1954 1691 -8:00 CA P%sT 1961 1692 -8:00 - PST 1976 1693 -8:00 US P%sT 1996 1694 -8:00 Mexico P%sT 2001 1695 -8:00 US P%sT 2002 Feb 20 1696 -8:00 Mexico P%sT 1697# From Paul Eggert (2001-03-05): 1698# Formerly there was an America/Ensenada zone, which differed from 1699# America/Tijuana only in that it did not observe DST from 1976 1700# through 1995. This was as per Shanks. However, Guy Harris reports 1701# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and 1702# Tijuana observe DST," which contradicts Shanks but does imply that 1703# DST-observance was a town-by-town matter back then. This concerns 1704# data after 1970 so most likely there should be at least one Zone 1705# other than America/Tijuana for Baja, but it's not clear yet what its 1706# name or contents should be. 1707# 1708# Revillagigedo Is 1709# no information 1710 1711############################################################################### 1712 1713# Anguilla 1714# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1715Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 1716 -4:00 - AST 1717 1718# Antigua and Barbuda 1719# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1720Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 1721 -5:00 - EST 1951 1722 -4:00 - AST 1723 1724# Bahamas 1725# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1726Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 1727Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 1728Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 1729# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1730Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 1731 -5:00 Bahamas E%sT 1732 1733# Barbados 1734# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1735Rule Barb 1977 only - Jun 12 2:00 1:00 D 1736Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1737Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1738Rule Barb 1979 only - Sep 30 2:00 0 S 1739Rule Barb 1980 only - Sep 25 2:00 0 S 1740# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1741Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1742 -3:58:28 - BMT 1932 # Bridgetown Mean Time 1743 -4:00 Barb A%sT 1744 1745# Belize 1746# Whitman entirely disagrees with Shanks; go with Shanks. 1747# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1748Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1749Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1750Rule Belize 1973 only - Dec 5 0:00 1:00 D 1751Rule Belize 1974 only - Feb 9 0:00 0 S 1752Rule Belize 1982 only - Dec 18 0:00 1:00 D 1753Rule Belize 1983 only - Feb 12 0:00 0 S 1754# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1755Zone America/Belize -5:52:48 - LMT 1912 Apr 1756 -6:00 Belize C%sT 1757 1758# Bermuda 1759# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1760Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1761 -4:00 - AST 1974 Apr 28 2:00 1762 -4:00 Bahamas A%sT 1763 1764# Cayman Is 1765# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1766Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1767 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1768 -5:00 - EST 1769 1770# Costa Rica 1771# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1772Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1773Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1774Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 1775# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 1776Rule CR 1991 only - Jul 1 0:00 0 S 1777Rule CR 1992 only - Mar 15 0:00 0 S 1778# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1779# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1780Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1781 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 1782 -6:00 CR C%sT 1783# Coco 1784# no information; probably like America/Costa_Rica 1785 1786# Cuba 1787 1788# From Arthur David Olson (1999-03-29): 1789# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 1790# the Cuban National Team and the Baltimore Orioles was carried live on 1791# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 1792# During the game, play-by-play announcer Jim Hunter noted that 1793# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 1794# Time today." (The "two hour" remark referred to losing one hour of 1795# sleep on 1999-03-28--when the announcers were in Cuba as it switched 1796# to DST--and one more hour on 1999-04-04--when the announcers will have 1797# returned to Baltimore, which switches on that date.) 1798 1799# From Evert van der Veer via Steffen Thorsen (2004-10-28): 1800# Cuba is not going back to standard time this year. 1801# From Paul Eggert (2004-10-28): 1802# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 1803# says that it's due to a problem at the Antonio Guiteras 1804# thermoelectric plant, and says "This October there will be no return 1805# to normal hours (after daylight saving time)". 1806# For now, let's assume that it's a one-year temporary measure. 1807 1808# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1809Rule Cuba 1928 only - Jun 10 0:00 1:00 D 1810Rule Cuba 1928 only - Oct 10 0:00 0 S 1811Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 1812Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 1813Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 1814Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 1815Rule Cuba 1965 only - Jun 1 0:00 1:00 D 1816Rule Cuba 1965 only - Sep 30 0:00 0 S 1817Rule Cuba 1966 only - May 29 0:00 1:00 D 1818Rule Cuba 1966 only - Oct 2 0:00 0 S 1819Rule Cuba 1967 only - Apr 8 0:00 1:00 D 1820Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 1821Rule Cuba 1968 only - Apr 14 0:00 1:00 D 1822Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 1823Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 1824Rule Cuba 1972 1974 - Oct 8 0:00 0 S 1825Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 1826Rule Cuba 1978 only - May 7 0:00 1:00 D 1827Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 1828Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 1829Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 1830Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 1831Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 1832Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 1833Rule Cuba 1996 only - Oct 6 0:00s 0 S 1834Rule Cuba 1997 only - Oct 12 0:00s 0 S 1835Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 1836Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 1837Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D 1838Rule Cuba 2005 max - Oct lastSun 0:00s 0 S 1839 1840# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1841Zone America/Havana -5:29:28 - LMT 1890 1842 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 1843 -5:00 Cuba C%sT 1844 1845# Dominica 1846# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1847Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 1848 -4:00 - AST 1849 1850# Dominican Republic 1851 1852# From Steffen Thorsen (2000-10-30): 1853# Enrique Morales reported to me that the Dominican Republic has changed the 1854# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 1855# http://www.listin.com.do/antes/261000/republica/princi.html 1856 1857# From Paul Eggert (2000-12-04): 1858# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 1859 1860# From Rives McDow (2000-12-01): 1861# Dominican Republic changed its mind and presidential decree on Tuesday, 1862# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 1863# Dominican Republic will be reverting to 8 hours from the International Date 1864# Line, and will not be using DST in the foreseeable future. The reason they 1865# decided to use DST was to be in synch with Puerto Rico, who was also going 1866# to implement DST. When Puerto Rico didn't implement DST, the president 1867# decided to revert. 1868 1869 1870# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1871Rule DR 1966 only - Oct 30 0:00 1:00 D 1872Rule DR 1967 only - Feb 28 0:00 0 S 1873Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 1874Rule DR 1970 only - Feb 21 0:00 0 S 1875Rule DR 1971 only - Jan 20 0:00 0 S 1876Rule DR 1972 1974 - Jan 21 0:00 0 S 1877# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1878Zone America/Santo_Domingo -4:39:36 - LMT 1890 1879 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 1880 -5:00 DR E%sT 1974 Oct 27 1881 -4:00 - AST 2000 Oct 29 02:00 1882 -5:00 US E%sT 2000 Dec 3 01:00 1883 -4:00 - AST 1884 1885# El Salvador 1886# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1887Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 1888Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 1889# There are too many San Salvadors elsewhere, so use America/El_Salvador 1890# instead of America/San_Salvador. 1891# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1892Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 1893 -6:00 Salv C%sT 1894 1895# Grenada 1896# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1897Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 1898 -4:00 - AST 1899 1900# Guadeloupe 1901# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1902Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 1903 -4:00 - AST 1904 1905# Guatemala 1906# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1907Rule Guat 1973 only - Nov 25 0:00 1:00 D 1908Rule Guat 1974 only - Feb 24 0:00 0 S 1909Rule Guat 1983 only - May 21 0:00 1:00 D 1910Rule Guat 1983 only - Sep 22 0:00 0 S 1911Rule Guat 1991 only - Mar 23 0:00 1:00 D 1912Rule Guat 1991 only - Sep 7 0:00 0 S 1913# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1914Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 1915 -6:00 Guat C%sT 1916 1917# Haiti 1918# From Gwillim Law (2005-04-15): 1919# Risto O. Nykanen wrote me that Haiti is now on DST. 1920# I searched for confirmation, and I found a 1921# <a href="http://www.haitianconsulate.org/time.doc"> press release 1922# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 1923# </a>. Translated from French, it says: 1924# 1925# "The Prime Minister's Communication Office notifies the public in general 1926# and the press in particular that, following a decision of the Interior 1927# Ministry and the Territorial Collectivities [I suppose that means the 1928# provinces], Haiti will move to Eastern Daylight Time in the night from next 1929# Saturday the 2nd to Sunday the 3rd. 1930# 1931# "Consequently, the Prime Minister's Communication Office wishes to inform 1932# the population that the country's clocks will be set forward one hour 1933# starting at midnight. This provision will hold until the last Saturday in 1934# October 2005. 1935# 1936# "Port-au-Prince, March 31, 2005" 1937 1938# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1939Rule Haiti 1983 only - May 8 0:00 1:00 D 1940Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 1941Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 1942# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA. 1943Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 1944Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 1945Rule Haiti 2005 only - Apr Sun>=1 0:00 1:00 D 1946Rule Haiti 2005 only - Oct lastSun 0:00 0 S 1947# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1948Zone America/Port-au-Prince -4:49:20 - LMT 1890 1949 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 1950 -5:00 Haiti E%sT 1951 1952# Honduras 1953# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 1954# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1955Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 1956 -6:00 Salv C%sT 1957# 1958# Great Swan I ceded by US to Honduras in 1972 1959 1960# Jamaica 1961 1962# From Bob Devine (1988-01-28): 1963# Follows US rules. 1964 1965# From U. S. Naval Observatory (1989-01-19): 1966# JAMAICA 5 H BEHIND UTC 1967 1968# From Shanks: 1969# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1970Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 1971 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1972 -5:00 - EST 1974 Apr 28 2:00 1973 -5:00 US E%sT 1984 1974 -5:00 - EST 1975 1976# Martinique 1977# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1978Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 1979 -4:04:20 - FFMT 1911 May # Fort-de-France MT 1980 -4:00 - AST 1980 Apr 6 1981 -4:00 1:00 ADT 1980 Sep 28 1982 -4:00 - AST 1983 1984# Montserrat 1985# From Paul Eggert (1997-08-31): 1986# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 1987# Luckily, Olveston, the current de facto capital, has the same longitude. 1988# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1989Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 1990 -4:00 - AST 1991 1992# Nicaragua 1993# 1994# From Steffen Thorsen (1998-12-29): 1995# Nicaragua seems to be back at -6:00 but I have not been able to find when 1996# they changed from -5:00. 1997# 1998# From Steffen Thorsen (2005-04-12): 1999# I've got reports from 8 different people that Nicaragua just started 2000# DST on Sunday 2005-04-10, in order to save energy because of 2001# expensive petroleum. The exact end date for DST is not yet 2002# announced, only "September" but some sites also say "mid-September". 2003# Some background information is available on the President's official site: 2004# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 2005# The Decree, no 23-2005 is available here: 2006# 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 2007# 2008# From Paul Eggert (2005-05-01): 2009# The decree doesn't say anything about daylight saving, but for now let's 2010# assume that it is daylight saving and that they'll switch back on the 2011# 3rd Sunday in September. 2012# 2013# From Gwillim Law (2005-04-21): 2014# The Associated Press story on the time change, which can be found at 2015# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 2016# and elsewhere, says (fifth paragraph, translated from Spanish): "The last 2017# time that a change of clocks was applied to save energy was in the year 2000 2018# during the Arnoldo Aleman administration."... 2019# The northamerica file says that Nicaragua has been on UTC-6 continuously 2020# since December 1998. I wasn't able to find any details of Nicaraguan time 2021# changes in 2000. Perhaps a note could be added to the northamerica file, to 2022# the effect that we have indirect evidence that DST was observed in 2000. 2023# 2024# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2025Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 2026Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 2027Rule Nic 1992 only - Jan 1 4:00 1:00 D 2028Rule Nic 1992 only - Sep 24 0:00 0 S 2029Rule Nic 2005 only - Apr 10 0:00 1:00 D 2030Rule Nic 2005 only - Sep 18 0:00 0 S 2031# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2032Zone America/Managua -5:45:08 - LMT 1890 2033 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 2034 -6:00 - CST 1973 May 2035 -5:00 - EST 1975 Feb 16 2036 -6:00 Nic C%sT 1993 Jan 1 4:00 2037 -5:00 - EST 1998 Dec 2038 -6:00 Nic C%sT 2039 2040# Panama 2041# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2042Zone America/Panama -5:18:08 - LMT 1890 2043 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time 2044 -5:00 - EST 2045 2046# Puerto Rico 2047# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 2048# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2049Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 2050 -4:00 - AST 1942 May 3 2051 -4:00 1:00 AWT 1945 Sep 30 2:00 2052 -4:00 - AST 2053 2054# St Kitts-Nevis 2055# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2056Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 2057 -4:00 - AST 2058 2059# St Lucia 2060# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2061Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 2062 -4:04:00 - CMT 1912 # Castries Mean Time 2063 -4:00 - AST 2064 2065# St Pierre and Miquelon 2066# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 2067# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2068Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 2069 -4:00 - AST 1980 May 2070 -3:00 - PMST 1987 # Pierre & Miquelon Time 2071 -3:00 Canada PM%sT 2072 2073# St Vincent and the Grenadines 2074# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2075Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 2076 -4:04:56 - KMT 1912 # Kingstown Mean Time 2077 -4:00 - AST 2078 2079# Turks and Caicos 2080# From Paul Eggert (1998-08-06): 2081# Shanks says they use US DST rules, but IATA SSIM (1991/1998) 2082# says they switch at midnight. Go with IATA SSIM. 2083# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2084Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D 2085Rule TC 1979 max - Oct lastSun 0:00 0 S 2086Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D 2087# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2088Zone America/Grand_Turk -4:44:32 - LMT 1890 2089 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 2090 -5:00 TC E%sT 2091 2092# British Virgin Is 2093# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2094Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 2095 -4:00 - AST 2096 2097# Virgin Is 2098# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2099Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 2100 -4:00 - AST 2101