1# @(#)northamerica 7.87 2# <pre> 3 4# also includes Central America and the Caribbean 5 6# This data is by no means authoritative; if you think you know better, 7# go ahead and edit the file (and please send any changes to 8# tz@elsie.nci.nih.gov for general use in the future). 9 10# From Paul Eggert (1999-03-22): 11# A reliable and entertaining source about time zones is 12# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 13 14############################################################################### 15 16# United States 17 18# From Paul Eggert (1999-03-31): 19# Howse writes (pp 121-125) that time zones were invented by 20# Professor Charles Ferdinand Dowd (1825-1904), 21# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 22# His pamphlet ``A System of National Time for Railroads'' (1870) 23# was the result of his proposals at the Convention of Railroad Trunk Lines 24# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 25# but in 1872-05 he moved the proposed origin to Greenwich. 26# His proposal was adopted by the railroads on 1883-11-18 at 12:00, 27# and the most of the country soon followed suit. 28 29# From Paul Eggert (2005-04-16): 30# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 31# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 32 33# From Paul Eggert (1995-12-19): 34# A good source for time zone historical data in the US is 35# Thomas G. Shanks, The American Atlas (5th edition), 36# San Diego: ACS Publications, Inc. (1991). 37# Make sure you have the errata sheet; the book is somewhat useless without it. 38# It is the source for most of the pre-1991 US and Puerto Rico entries below. 39 40# From Paul Eggert (2001-03-06): 41# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 42# in his whimsical essay ``An Economical Project for Diminishing the Cost 43# of Light'' published in the Journal de Paris (1784-04-26). 44# Not everyone is happy with the results: 45# 46# I don't really care how time is reckoned so long as there is some 47# agreement about it, but I object to being told that I am saving 48# daylight when my reason tells me that I am doing nothing of the kind. 49# I even object to the implication that I am wasting something 50# valuable if I stay in bed after the sun has risen. As an admirer 51# of moonlight I resent the bossy insistence of those who want to 52# reduce my time for enjoying it. At the back of the Daylight Saving 53# scheme I detect the bony, blue-fingered hand of Puritanism, eager 54# to push people into bed earlier, and get them up earlier, to make 55# them healthy, wealthy and wise in spite of themselves. 56# 57# -- Robertson Davies, The diary of Samuel Marchbanks, 58# Clarke, Irwin (1947), XIX, Sunday 59# 60# For more about the first ten years of DST in the United States, see 61# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html"> 62# Ten years of daylight saving from the Pittsburgh standpoint 63# (Carnegie Library of Pittsburgh, 1927)</a>. 64# 65# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 66# However, DST was imposed by the Standard Time Act of 1918, which 67# was the first nationwide legal time standard, and apparently 68# time was just called "Standard Time" or "Daylight Saving Time". 69 70# From Arthur David Olson: 71# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 72# See, for example, the front page of the Saturday, 1974-10-26 73# and Sunday, 1974-10-27 editions of the Washington Post. 74 75# From Arthur David Olson: 76# Before the Uniform Time Act of 1966 took effect in 1967, observance of 77# Daylight Saving Time in the US was by local option, except during wartime. 78 79# From Arthur David Olson (2000-09-25): 80# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 81# In the introduction, Oboler spoke of "Eastern Peace Time." 82# An AltaVista search turned up 83# <a href="http://rowayton.org/rhs/hstaug45.html">: 84# "When the time is announced over the radio now, it is 'Eastern Peace 85# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 86# </a> (August 1945) by way of confirmation. 87 88# From Joseph Gallant citing 89# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 90# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 91# to switch to London for Attlee's address, but the American people 92# never got to hear his speech live. According to one press account, 93# CBS' Bob Trout was first to announce the word of Japan's surrender, 94# but a few seconds later, NBC, ABC and Mutual also flashed the word 95# of surrender, all of whom interrupting the bells of Big Ben in 96# London which were to precede Mr. Attlee's speech. 97 98# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 99# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 100# 101# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 102# Any announcement from Asia would reach St. John's New York newsroom on a 103# wire service teletype machine, which had prescribed signals for major news. 104# Associated Press, for example, would ring five bells before spewing out 105# typed copy of an important story, and 10 bells for news "of transcendental 106# importance." 107# 108# On Aug. 14, stalling while talking steadily into the NBC networks' open 109# microphone, St. John heard five bells and waited only to hear a sixth bell, 110# before announcing confidently: "Ladies and gentlemen, World War II is over. 111# The Japanese have agreed to our surrender terms." 112# 113# He had scored a 20-second scoop on other broadcasters. 114 115# From Arthur David Olson (2005-08-22): 116# Paul has been careful to use the "US" rules only in those locations 117# that are part of the United States; this reflects the real scope of 118# U.S. government action. So even though the "US" rules have changed 119# in the latest release, other countries won't be affected. 120 121# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 122Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 123Rule US 1918 1919 - Oct lastSun 2:00 0 S 124Rule US 1942 only - Feb 9 2:00 1:00 W # War 125Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 126Rule US 1945 only - Sep 30 2:00 0 S 127Rule US 1967 2006 - Oct lastSun 2:00 0 S 128Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 129Rule US 1974 only - Jan 6 2:00 1:00 D 130Rule US 1975 only - Feb 23 2:00 1:00 D 131Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 132Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 133Rule US 2007 max - Mar Sun>=8 2:00 1:00 D 134Rule US 2007 max - Nov Sun>=1 2:00 0 S 135 136# From Arthur David Olson, 2005-12-19 137# We generate the files specified below to guard against old files with 138# obsolete information being left in the time zone binary directory. 139# We limit the list to names that have appeared in previous versions of 140# this time zone package. 141# We do these as separate Zones rather than as Links to avoid problems if 142# a particular place changes whether it observes DST. 143# We put these specifications here in the northamerica file both to 144# increase the chances that they'll actually get compiled and to 145# avoid the need to duplicate the US rules in another file. 146 147# Zone NAME GMTOFF RULES FORMAT [UNTIL] 148Zone EST -5:00 - EST 149Zone MST -7:00 - MST 150Zone HST -10:00 - HST 151Zone EST5EDT -5:00 US E%sT 152Zone CST6CDT -6:00 US C%sT 153Zone MST7MDT -7:00 US M%sT 154Zone PST8PDT -8:00 US P%sT 155 156# From Bob Devine (1988-01-28): 157# ...Alaska (and Hawaii) had the timezone names changed in 1967. 158# old new 159# Pacific Standard Time(PST) -same- 160# Yukon Standard Time(YST) -same- 161# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 162# Nome Standard Time (NT) Bering Standard Time (BST) 163# 164# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 165# The YST zone now covers nearly all of the state, AHST just part 166# of the Aleutian islands. No DST. 167 168# From Paul Eggert (1995-12-19): 169# The tables below use `NST', not `NT', for Nome Standard Time. 170# I invented `CAWT' for Central Alaska War Time. 171 172# From U. S. Naval Observatory (1989-01-19): 173# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 174# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 175# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 176# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 177# USA MOUNTAIN 7 H BEHIND UTC DENVER 178# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 179# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 180# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 181# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 182# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 183# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 184# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 185# USA HAWAII 10 H BEHIND UTC 186# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 187 188# From Arthur David Olson (1989-01-21): 189# The above dates are for 1988. 190# Note the "AKST" and "AKDT" abbreviations, the claim that there's 191# no DST in Samoa, and the claim that there is DST in Alaska and the 192# Aleutians. 193 194# From Arthur David Olson (1988-02-13): 195# Legal standard time zone names, from United States Code (1982 Edition and 196# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 197# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 198# took effect), as explained in sections 263 and 261: 199# (none) 200# United States standard eastern time 201# United States standard mountain time 202# United States standard central time 203# United States standard Pacific time 204# (none) 205# United States standard Alaska time 206# (none) 207# Next, names from 1967-04-01 until 1983-11-30 (the date for 208# public law 98-181): 209# Atlantic standard time 210# eastern standard time 211# central standard time 212# mountain standard time 213# Pacific standard time 214# Yukon standard time 215# Alaska-Hawaii standard time 216# Bering standard time 217# And after 1983-11-30: 218# Atlantic standard time 219# eastern standard time 220# central standard time 221# mountain standard time 222# Pacific standard time 223# Alaska standard time 224# Hawaii-Aleutian standard time 225# Samoa standard time 226# The law doesn't give abbreviations. 227# 228# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 229# Public law 106-564 (2000-12-23) introduced the abbreviation 230# "Chamorro Standard Time" for time in Guam and the Northern Marianas. 231# See the file "australasia". 232 233# From Arthur David Olson, 2005-08-09 234# The following was signed into law on 2005-08-08. 235# 236# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 237# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15 238# U.S.C. 260a(a)) is amended-- 239# (1) by striking `first Sunday of April' and inserting `second 240# Sunday of March'; and 241# (2) by striking `last Sunday of October' and inserting `first 242# Sunday of November'. 243# (b) Effective Date- Subsection (a) shall take effect 1 year after the 244# date of enactment of this Act or March 1, 2007, whichever is later. 245# (c) Report to Congress- Not later than 9 months after the effective 246# date stated in subsection (b), the Secretary shall report to Congress 247# on the impact of this section on energy consumption in the United 248# States. 249# (d) Right to Revert- Congress retains the right to revert the 250# Daylight Saving Time back to the 2005 time schedules once the 251# Department study is complete. 252 253# US eastern time, represented by New York 254 255# Connecticut, Delaware, District of Columbia, most of Florida, 256# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky 257# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, 258# New Hampshire, New Jersey, New York, North Carolina, Ohio, 259# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 260# Vermont, Virginia, West Virginia 261 262# From Dave Cantor (2004-11-02): 263# Early this summer I had the occasion to visit the Mount Washington 264# Observatory weather station atop (of course!) Mount Washington [, NH].... 265# One of the staff members said that the station was on Eastern Standard Time 266# and didn't change their clocks for Daylight Saving ... so that their 267# reports will always have times which are 5 hours behind UTC. 268 269# From Paul Eggert (2005-08-26): 270# According to today's Huntsville Times 271# <http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1> 272# a few towns on Alabama's "eastern border with Georgia, such as Phenix City 273# in Russell County, Lanett in Chambers County and some towns in Lee County, 274# set their watches and clocks on Eastern time." It quotes H.H. "Bubba" 275# Roberts, city administrator in Phenix City. as saying "We are in the Central 276# time zone, but we do go by the Eastern time zone because so many people work 277# in Columbus." 278 279# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 280Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 281Rule NYC 1920 only - Oct lastSun 2:00 0 S 282Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 283Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 284Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 285# Zone NAME GMTOFF RULES FORMAT [UNTIL] 286Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 287 -5:00 US E%sT 1920 288 -5:00 NYC E%sT 1942 289 -5:00 US E%sT 1946 290 -5:00 NYC E%sT 1967 291 -5:00 US E%sT 292 293# US central time, represented by Chicago 294 295# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 296# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 297# Washington counties), Illinois, western Indiana 298# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 299# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 300# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 301# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 302# western Tennessee, most of Texas, Wisconsin 303 304# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 305Rule Chicago 1920 only - Jun 13 2:00 1:00 D 306Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 307Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 308Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 309Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 310Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 311# Zone NAME GMTOFF RULES FORMAT [UNTIL] 312Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 313 -6:00 US C%sT 1920 314 -6:00 Chicago C%sT 1936 Mar 1 2:00 315 -5:00 - EST 1936 Nov 15 2:00 316 -6:00 Chicago C%sT 1942 317 -6:00 US C%sT 1946 318 -6:00 Chicago C%sT 1967 319 -6:00 US C%sT 320# Oliver County, ND switched from mountain to central time on 1992-10-25. 321Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 322 -7:00 US M%sT 1992 Oct 25 02:00 323 -6:00 US C%sT 324 325# US mountain time, represented by Denver 326# 327# Colorado, far western Kansas, Montana, western 328# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 329# New Mexico, southwestern North Dakota, far eastern Oregon, 330# western South Dakota, far western Texas (El Paso County, Hudspeth County, 331# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 332# 333# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 334Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 335Rule Denver 1920 only - Oct lastSun 2:00 0 S 336Rule Denver 1921 only - May 22 2:00 0 S 337Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 338Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 339# Zone NAME GMTOFF RULES FORMAT [UNTIL] 340Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 341 -7:00 US M%sT 1920 342 -7:00 Denver M%sT 1942 343 -7:00 US M%sT 1946 344 -7:00 Denver M%sT 1967 345 -7:00 US M%sT 346 347# US Pacific time, represented by Los Angeles 348# 349# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 350# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties), 351# most of Nevada, most of Oregon, and Washington 352# 353# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 354Rule CA 1948 only - Mar 14 2:00 1:00 D 355Rule CA 1949 only - Jan 1 2:00 0 S 356Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 357Rule CA 1950 1961 - Sep lastSun 2:00 0 S 358Rule CA 1962 1966 - Oct lastSun 2:00 0 S 359# Zone NAME GMTOFF RULES FORMAT [UNTIL] 360Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 361 -8:00 US P%sT 1946 362 -8:00 CA P%sT 1967 363 -8:00 US P%sT 364 365# Alaska 366# AK%sT is the modern abbreviation for -9:00 per USNO. 367# 368# From Paul Eggert (2001-05-30): 369# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 370# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 371# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 372# also a Friday. Include only the time zone part of this transition, 373# ignoring the switch from Julian to Gregorian, since we can't represent 374# the Julian calendar. 375# 376# As far as we know, none of the exact locations mentioned below were 377# permanently inhabited in 1867 by anyone using either calendar. 378# (Yakutat was colonized by the Russians in 1799, but the settlement 379# was destroyed in 1805 by a Yakutat-kon war party.) However, there 380# were nearby inhabitants in some cases and for our purposes perhaps 381# it's best to simply use the official transition. 382# 383# Zone NAME GMTOFF RULES FORMAT [UNTIL] 384Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 385 -8:57:41 - LMT 1900 Aug 20 12:00 386 -8:00 - PST 1942 387 -8:00 US P%sT 1946 388 -8:00 - PST 1969 389 -8:00 US P%sT 1983 Oct 30 2:00 390 -9:00 US Y%sT 1983 Nov 30 391 -9:00 US AK%sT 392Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 393 -9:18:55 - LMT 1900 Aug 20 12:00 394 -9:00 - YST 1942 395 -9:00 US Y%sT 1946 396 -9:00 - YST 1969 397 -9:00 US Y%sT 1983 Nov 30 398 -9:00 US AK%sT 399Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 400 -9:59:36 - LMT 1900 Aug 20 12:00 401 -10:00 - CAT 1942 402 -10:00 US CAT/CAWT 1946 403 -10:00 - CAT 1967 Apr 404 -10:00 - AHST 1969 405 -10:00 US AH%sT 1983 Oct 30 2:00 406 -9:00 US Y%sT 1983 Nov 30 407 -9:00 US AK%sT 408Zone America/Nome 12:58:21 - LMT 1867 Oct 18 409 -11:01:38 - LMT 1900 Aug 20 12:00 410 -11:00 - NST 1942 411 -11:00 US N%sT 1946 412 -11:00 - NST 1967 Apr 413 -11:00 - BST 1969 414 -11:00 US B%sT 1983 Oct 30 2:00 415 -9:00 US Y%sT 1983 Nov 30 416 -9:00 US AK%sT 417Zone America/Adak 12:13:21 - LMT 1867 Oct 18 418 -11:46:38 - LMT 1900 Aug 20 12:00 419 -11:00 - NST 1942 420 -11:00 US N%sT 1946 421 -11:00 - NST 1967 Apr 422 -11:00 - BST 1969 423 -11:00 US B%sT 1983 Oct 30 2:00 424 -10:00 US AH%sT 1983 Nov 30 425 -10:00 US HA%sT 426# The following switches don't quite make our 1970 cutoff. 427# 428# Shanks writes that part of southwest Alaska (e.g. Aniak) 429# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 430# and another part (e.g. Akiak) made the same switch five weeks later. 431# 432# From David Flater (2004-11-09): 433# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 434# Historic Preservation Commission, provided this information, which 435# suggests that Unalaska deviated from statutory time from early 1967 436# possibly until 1983: 437# 438# Minutes of the Unalaska City Council Meeting, January 10, 1967: 439# "Except for St. Paul and Akutan, Unalaska is the only important 440# location not on Alaska Standard Time. The following resolution was 441# made by William Robinson and seconded by Henry Swanson: Be it 442# resolved that the City of Unalaska hereby goes to Alaska Standard 443# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 444# January 14, Alaska Standard Time.) This resolution was passed with 445# three votes for and one against." 446 447# Hawaii 448# 449# From Arthur David Olson: 450# And then there's Hawaii. 451# DST was observed for one day in 1933; 452# standard time was changed by half an hour in 1947; 453# it's always standard as of 1986. 454# 455# From Paul Eggert: 456# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 457# 458Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 459 -10:30 - HST 1933 Apr 30 2:00 460 -10:30 1:00 HDT 1933 May 21 2:00 461 -10:30 US H%sT 1947 Jun 8 2:00 462 -10:00 - HST 463 464# Now we turn to US areas that have diverged from the consensus since 1970. 465 466# Arizona mostly uses MST. 467 468# From Paul Eggert (2002-10-20): 469# 470# The information in the rest of this paragraph is derived from the 471# <a href="http://www.dlapr.lib.az.us/links/daylight.htm"> 472# Daylight Saving Time web page (2002-01-23)</a> maintained by the 473# Arizona State Library, Archives and Public Records. 474# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 475# time, but by federal law railroads, airlines, bus lines, military 476# personnel, and some engaged in interstate commerce continued to 477# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 478# Gazette says that was the date the law changed, and that 04-01 was 479# the date the state's clocks would change. In 1945 the State of 480# Arizona used standard time all year, again with exceptions only as 481# mandated by federal law. Arizona observed DST in 1967, but Arizona 482# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 483# 484# Shanks says the 1944 experiment came to an end on 1944-03-17. 485# Go with the Arizona State Library instead. 486 487Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 488 -7:00 US M%sT 1944 Jan 1 00:01 489 -7:00 - MST 1944 Apr 1 00:01 490 -7:00 US M%sT 1944 Oct 1 00:01 491 -7:00 - MST 1967 492 -7:00 US M%sT 1968 Mar 21 493 -7:00 - MST 494# From Arthur David Olson (1988-02-13): 495# A writer from the Inter Tribal Council of Arizona, Inc., 496# notes in private correspondence dated 1987-12-28 that "Presently, only the 497# Navajo Nation participates in the Daylight Saving Time policy, due to its 498# large size and location in three states." (The "only" means that other 499# tribal nations don't use DST.) 500 501Link America/Denver America/Shiprock 502 503# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 504# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 505# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 506# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 507# Teton, Twin Falls, Valley, Washington counties) and eastern Oregon 508# switched four weeks late in 1974. 509# 510# Zone NAME GMTOFF RULES FORMAT [UNTIL] 511Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 512 -8:00 US P%sT 1923 May 13 2:00 513 -7:00 US M%sT 1974 514 -7:00 - MST 1974 Feb 3 2:00 515 -7:00 US M%sT 516 517# Indiana 518# 519# For a map of Indiana's time zone regions, see: 520# <a href="http://www.mccsc.edu/time.html"> 521# What time is it in Indiana? 522# </a> (2005-05-03) 523# 524# From Paul Eggert (2005-08-22): 525# Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 526# with the following exceptions: 527# 528# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 529# Vandenburgh, and Warrick counties have been like America/Chicago. 530# 531# - Dearborn and Ohio counties have been like America/New_York. 532# 533# - Clark, Floyd, and Harrison counties have been like 534# America/Kentucky/Louisville. 535# 536# - Crawford, Starke, and Switzerland counties have their own time zone 537# histories as noted below. 538# 539# Shanks partitions Indiana into 345 regions, each with its own time history, 540# and writes ``Even newspaper reports present contradictory information.'' 541# Fortunately, most of the complexity occurred before our cutoff date of 1970. 542# 543# Other than Indianapolis, the Indiana place names are so nondescript 544# that they would be ambiguous if we left them at the `America' level. 545# So we reluctantly put them all in a subdirectory `America/Indiana'. 546 547# From Paul Eggert (2005-08-16): 548# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006, 549# and that many counties may switch either to Central or to Eastern time. 550# The county-by-county decisions have not been made yet, so for now assume 551# that no counties will switch: this assumption is most likely wrong, 552# but it's the best we can do for now. 553 554# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 555Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 556Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 557Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 558# Zone NAME GMTOFF RULES FORMAT [UNTIL] 559Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 560 -6:00 US C%sT 1920 561 -6:00 Indianapolis C%sT 1942 562 -6:00 US C%sT 1946 563 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 564 -5:00 - EST 1957 Sep 29 2:00 565 -6:00 - CST 1958 Apr 27 2:00 566 -5:00 - EST 1969 567 -5:00 US E%sT 1971 568 -5:00 - EST 2006 569 -5:00 US E%sT 570# 571# Part of Crawford County, Indiana, last observed DST in 1975, 572# and left its clocks alone in 1974. 573# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 574Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 575Rule Marengo 1951 only - Sep lastSun 2:00 0 S 576Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 577Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 578# Zone NAME GMTOFF RULES FORMAT [UNTIL] 579Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 580 -6:00 US C%sT 1951 581 -6:00 Marengo C%sT 1961 Apr 30 2:00 582 -5:00 - EST 1969 583 -5:00 US E%sT 1974 Jan 6 2:00 584 -6:00 1:00 CDT 1974 Oct 27 2:00 585 -5:00 US E%sT 1976 586 -5:00 - EST 2006 587 -5:00 US E%sT 588# 589# Starke County, Indiana 590# From Arthur David Olson (1991-10-28): 591# An article on page A3 of the Sunday, 1991-10-27 Washington Post 592# notes that Starke County switched from Central time to Eastern time as of 593# 1991-10-27. 594# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 595Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 596Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 597Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 598Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 599Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 600# Zone NAME GMTOFF RULES FORMAT [UNTIL] 601Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 602 -6:00 US C%sT 1947 603 -6:00 Starke C%sT 1962 Apr 29 2:00 604 -5:00 - EST 1963 Oct 27 2:00 605 -6:00 US C%sT 1991 Oct 27 2:00 606 -5:00 - EST 2006 607 -5:00 US E%sT 608# 609# Switzerland County, Indiana, last observed DST in 1972. 610# Zone NAME GMTOFF RULES FORMAT [UNTIL] 611Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 612 -6:00 US C%sT 1954 Apr 25 2:00 613 -5:00 - EST 1969 614 -5:00 US E%sT 1973 615 -5:00 - EST 2006 616 -5:00 US E%sT 617 618# Part of Kentucky left its clocks alone in 1974. 619# This also includes Clark, Floyd, and Harrison counties in Indiana. 620# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 621Rule Louisville 1921 only - May 1 2:00 1:00 D 622Rule Louisville 1921 only - Sep 1 2:00 0 S 623Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 624Rule Louisville 1941 only - Sep lastSun 2:00 0 S 625Rule Louisville 1946 only - Jun 2 2:00 0 S 626Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 627Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 628# Zone NAME GMTOFF RULES FORMAT [UNTIL] 629Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 630 -6:00 US C%sT 1921 631 -6:00 Louisville C%sT 1942 632 -6:00 US C%sT 1946 633 -6:00 Louisville C%sT 1961 Jul 23 2:00 634 -5:00 - EST 1968 635 -5:00 US E%sT 1974 Jan 6 2:00 636 -6:00 1:00 CDT 1974 Oct 27 2:00 637 -5:00 US E%sT 638# 639# Wayne, Clinton, and Russell Counties, Kentucky 640# 641# From 642# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 643# Lake Cumberland LIFE 644# </a> (1999-01-29) via WKYM-101.7: 645# Clinton County has joined Wayne County in asking the DoT to change from 646# the Central to the Eastern time zone.... The Wayne County government made 647# the same request in December. And while Russell County officials have not 648# taken action, the majority of respondents to a poll conducted there in 649# August indicated they would like to change to "fast time" also. 650# The three Lake Cumberland counties are the farthest east of any U.S. 651# location in the Central time zone. 652# 653# From Rich Wales (2000-08-29): 654# After prolonged debate, and despite continuing deep differences of opinion, 655# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 656# (-0500) time. They won't "fall back" this year. See Sara Shipley, 657# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 658# 659# From Paul Eggert (2001-07-16): 660# The final rule was published in the 661# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> 662# Federal Register 65, 160 (2000-08-17), page 50154-50158. 663# </a> 664# 665Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 666 -6:00 US C%sT 1946 667 -6:00 - CST 1968 668 -6:00 US C%sT 2000 Oct 29 2:00 669 -5:00 US E%sT 670 671 672# From Rives McDow (2000-08-30): 673# Here ... are all the changes in the US since 1985. 674# Kearny County, KS (put all of county on central; 675# previously split between MST and CST) ... 1990-10 676# Starke County, IN (from CST to EST) ... 1991-10 677# Oliver County, ND (from MST to CST) ... 1992-10 678# West Wendover, NV (from PST TO MST) ... 1999-10 679# Wayne County, KY (from CST to EST) ... 2000-10 680# 681# From Paul Eggert (2001-07-17): 682# We don't know where the line used to be within Kearny County, KS, 683# so omit that change for now. 684# See America/Indiana/Knox for the Starke County, IN change. 685# See America/North_Dakota/Center for the Oliver County, ND change. 686# West Wendover, NV officially switched from Pacific to mountain time on 687# 1999-10-31. See the 688# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> 689# Federal Register 64, 203 (1999-10-21), page 56705-56707. 690# </a> 691# However, the Federal Register says that West Wendover already operated 692# on mountain time, and the rule merely made this official; 693# hence a separate tz entry is not needed. 694 695# Michigan 696# 697# From Bob Devine (1988-01-28): 698# Michigan didn't observe DST from 1968 to 1973. 699# 700# From Paul Eggert (1999-03-31): 701# Shanks writes that Michigan started using standard time on 1885-09-18, 702# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 703# that Detroit kept 704# 705# local time until 1900 when the City Council decreed that clocks should 706# be put back twenty-eight minutes to Central Standard Time. Half the 707# city obeyed, half refused. After considerable debate, the decision 708# was rescinded and the city reverted to Sun time. A derisive offer to 709# erect a sundial in front of the city hall was referred to the 710# Committee on Sewers. Then, in 1905, Central time was adopted 711# by city vote. 712# 713# This story is too entertaining to be false, so go with Howse over Shanks. 714# 715# From Paul Eggert (2001-03-06): 716# Garland (1927) writes ``Cleveland and Detroit advanced their clocks 717# one hour in 1914.'' This change is not in Shanks. We have no more 718# info, so omit this for now. 719# 720# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 721# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 722Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 723Rule Detroit 1948 only - Sep lastSun 2:00 0 S 724Rule Detroit 1967 only - Jun 14 2:00 1:00 D 725Rule Detroit 1967 only - Oct lastSun 2:00 0 S 726# Zone NAME GMTOFF RULES FORMAT [UNTIL] 727Zone America/Detroit -5:32:11 - LMT 1905 728 -6:00 - CST 1915 May 15 2:00 729 -5:00 - EST 1942 730 -5:00 US E%sT 1946 731 -5:00 Detroit E%sT 1973 732 -5:00 US E%sT 1975 733 -5:00 - EST 1975 Apr 27 2:00 734 -5:00 US E%sT 735# 736# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 737# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 738Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 739Rule Menominee 1946 only - Sep lastSun 2:00 0 S 740Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 741Rule Menominee 1966 only - Oct lastSun 2:00 0 S 742# Zone NAME GMTOFF RULES FORMAT [UNTIL] 743Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 744 -6:00 US C%sT 1946 745 -6:00 Menominee C%sT 1969 Apr 27 2:00 746 -5:00 - EST 1973 Apr 29 2:00 747 -6:00 US C%sT 748 749# Navassa 750# administered by the US Fish and Wildlife Service 751# claimed by US under the provisions of the 1856 Guano Islands Act 752# also claimed by Haiti 753# occupied 1857/1900 by the Navassa Phosphate Co 754# US lighthouse 1917/1996-09 755# currently uninhabited 756# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 757# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 758# Jimmy Skaggs, _The Great Guano Rush_ (1994). 759 760################################################################################ 761 762 763# From Paul Eggert (1999-10-29): 764# A good source for time zone historical data outside the US is 765# Thomas G. Shanks, The International Atlas (5th edition), 766# San Diego: ACS Publications, Inc. (1999). 767# 768# Gwillim Law writes that a good source 769# for recent time zone data is the International Air Transport 770# Association's Standard Schedules Information Manual (IATA SSIM), 771# published semiannually. Law sent in several helpful summaries 772# of the IATA's data after 1990. 773# 774# Except where otherwise noted, Shanks is the source for entries through 1990, 775# and IATA SSIM is the source for entries after 1990. 776# 777# Other sources occasionally used include: 778# 779# Edward W. Whitman, World Time Differences, 780# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 781# which I found in the UCLA library. 782# 783# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf"> 784# William Willett, The Waste of Daylight, 19th edition 785# </a> (1914-03) 786# 787# See the `europe' file for Greenland. 788 789# Canada 790 791# From Alain LaBont<e'> (1994-11-14): 792# I post here the time zone abbreviations standardized in Canada 793# for both English and French in the CAN/CSA-Z234.4-89 standard.... 794# 795# UTC Standard time Daylight savings time 796# offset French English French English 797# -2:30 - - HAT NDT 798# -3 - - HAA ADT 799# -3:30 HNT NST - - 800# -4 HNA AST HAE EDT 801# -5 HNE EST HAC CDT 802# -6 HNC CST HAR MDT 803# -7 HNR MST HAP PDT 804# -8 HNP PST HAY YDT 805# -9 HNY YST - - 806# 807# HN: Heure Normale ST: Standard Time 808# HA: Heure Avanc<e'>e DT: Daylight saving Time 809# 810# A: de l'Atlantique Atlantic 811# C: du Centre Central 812# E: de l'Est Eastern 813# M: Mountain 814# N: Newfoundland 815# P: du Pacifique Pacific 816# R: des Rocheuses 817# T: de Terre-Neuve 818# Y: du Yukon Yukon 819# 820# From Paul Eggert (1994-11-22): 821# Alas, this sort of thing must be handled by localization software. 822 823# Unless otherwise specified, the data for Canada are all from Shanks. 824 825# From Paul Eggert (2005-12-21): 826# H. David Matthews and Mary Vincent's map 827# <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp"> 828# "It's about TIME", _Canadian Geographic_ (September-October 1998) 829# </a> contains detailed boundaries for regions observing nonstandard 830# time and daylight saving time arrangements in Canada circa 1998. 831# 832# INMS, the Institute for National Measurement Standards in Ottawa, has <a 833# href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php"> 834# information about standard and daylight saving time zones in Canada. 835# </a> (updated periodically). 836# Its unofficial information is often taken from Matthews and Vincent. 837# 838# CBC News reported that Ontario and Manitoba have announced plans to 839# follow the US change, and that Nova Scotia is considering it; see 840# <http://www.cbc.ca/news/background/daylightsavingtime/> (2005-10-21). 841# CBC news also reported that Prince Edward Island is the first 842# province in Atlantic Canada to follow the US change, and that Quebec 843# had agreed; see <http://www.cbc.ca/pei/story/pe_daylight_20051207.html> 844# (2005-12-07). 845# 846# To reflect all this, the Canada and Winn rules have been adjusted to 847# agree with the 2007 US change. This means we assume most of Canada 848# will fall into line. However, Alberta, British Columbia, 849# Newfoundland, Northwest Territories, and Yukon already have separate 850# rules in our database, so for now we'll leave them alone, which 851# means that we currently assume these regions will not change their 852# rules and will disagree with the US starting in 2007. This 853# assumption is probably incorrect, with the possible exception of 854# Newfoundland. We plan to adjust the Edm, Vanc, StJohns, and NT_YK 855# rules as the corresponding provinces make their announcements. 856 857# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 858Rule Canada 1918 only - Apr 14 2:00 1:00 D 859Rule Canada 1918 only - Oct 31 2:00 0 S 860Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 861Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 862Rule Canada 1945 only - Sep 30 2:00 0 S 863Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 864Rule Canada 1974 2006 - Oct lastSun 2:00 0 S 865Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D 866Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D 867Rule Canada 2007 max - Nov Sun>=1 2:00 0 S 868 869 870# Newfoundland (and far southeast Labrador) 871 872# From Paul Eggert (2000-10-02): 873# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 874# but the only part of Labrador that follows the rules is the 875# southeast corner, including Port Hope Simpson and Mary's Harbour, 876# but excluding, say, Black Tickle. 877 878# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 879Rule StJohns 1917 only - Apr 8 2:00 1:00 D 880Rule StJohns 1917 only - Sep 17 2:00 0 S 881# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 882Rule StJohns 1919 only - May 5 23:00 1:00 D 883Rule StJohns 1919 only - Aug 12 23:00 0 S 884# For 1931-1935 Whitman gives Apr same date; go with Shanks. 885Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 886Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 887# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks. 888Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 889Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 890# Whitman gives the following transitions: 891# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 892# but go with Shanks and assume they used Canadian rules. 893# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 894# Apr 30 - Sep 24; go with Shanks. 895Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 896Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 897Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 898Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 899Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 900# From Paul Eggert (2000-10-02): 901# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 902# at 00:01 local time. For now, assume it started in 1987. 903Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 904Rule StJohns 1987 max - Oct lastSun 0:01 0 S 905Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 906Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D 907# St John's has an apostrophe, but Posix file names can't have apostrophes. 908# Zone NAME GMTOFF RULES FORMAT [UNTIL] 909Zone America/St_Johns -3:30:52 - LMT 1884 910 -3:30:52 StJohns N%sT 1918 911 -3:30:52 Canada N%sT 1919 912 -3:30:52 StJohns N%sT 1935 Mar 30 913 -3:30 StJohns N%sT 1942 May 11 914 -3:30 Canada N%sT 1946 915 -3:30 StJohns N%sT 916 917# most of east Labrador 918 919# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 920# Zone NAME GMTOFF RULES FORMAT [UNTIL] 921Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 922 -3:30:52 - NST 1918 923 -3:30:52 Canada N%sT 1919 924 -3:30:52 - NST 1935 Mar 30 925 -3:30 - NST 1936 926 -3:30 StJohns N%sT 1942 May 11 927 -3:30 Canada N%sT 1946 928 -3:30 StJohns N%sT 1966 Mar 15 2:00 929 -4:00 StJohns A%sT 930 931 932# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 933 934# From Paul Eggert (1996-06-12): 935# Shanks writes that since 1970 most of this region has been like Halifax. 936# Many locales did not observe peacetime DST until 1972; 937# Glace Bay, NS is the largest that we know of. 938# Shanks also writes that Liverpool, NS was the only town in Canada to observe 939# DST in 1971 but not 1970; for now we'll assume this is a typo. 940 941# From Paul Eggert (2000-10-02): 942# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches 943# at 00:01 local time. FIXME: verify and create a new Zone for this. 944 945 946# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 947Rule Halifax 1916 only - Apr 1 0:00 1:00 D 948Rule Halifax 1916 only - Oct 1 0:00 0 S 949Rule Halifax 1920 only - May 9 0:00 1:00 D 950Rule Halifax 1920 only - Aug 29 0:00 0 S 951Rule Halifax 1921 only - May 6 0:00 1:00 D 952Rule Halifax 1921 1922 - Sep 5 0:00 0 S 953Rule Halifax 1922 only - Apr 30 0:00 1:00 D 954Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 955Rule Halifax 1923 only - Sep 4 0:00 0 S 956Rule Halifax 1924 only - Sep 15 0:00 0 S 957Rule Halifax 1925 only - Sep 28 0:00 0 S 958Rule Halifax 1926 only - May 16 0:00 1:00 D 959Rule Halifax 1926 only - Sep 13 0:00 0 S 960Rule Halifax 1927 only - May 1 0:00 1:00 D 961Rule Halifax 1927 only - Sep 26 0:00 0 S 962Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 963Rule Halifax 1928 only - Sep 9 0:00 0 S 964Rule Halifax 1929 only - Sep 3 0:00 0 S 965Rule Halifax 1930 only - Sep 15 0:00 0 S 966Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 967Rule Halifax 1932 only - May 1 0:00 1:00 D 968Rule Halifax 1933 only - Apr 30 0:00 1:00 D 969Rule Halifax 1933 only - Oct 2 0:00 0 S 970Rule Halifax 1934 only - May 20 0:00 1:00 D 971Rule Halifax 1934 only - Sep 16 0:00 0 S 972Rule Halifax 1935 only - Jun 2 0:00 1:00 D 973Rule Halifax 1935 only - Sep 30 0:00 0 S 974Rule Halifax 1936 only - Jun 1 0:00 1:00 D 975Rule Halifax 1936 only - Sep 14 0:00 0 S 976Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 977Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 978Rule Halifax 1939 only - May 28 0:00 1:00 D 979Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 980Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 981Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 982Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 983Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 984Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 985Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 986Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 987Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 988# Zone NAME GMTOFF RULES FORMAT [UNTIL] 989Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 990 -4:00 Halifax A%sT 1918 991 -4:00 Canada A%sT 1919 992 -4:00 Halifax A%sT 1942 Feb 9 2:00s 993 -4:00 Canada A%sT 1946 994 -4:00 Halifax A%sT 1974 995 -4:00 Canada A%sT 996Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 997 -4:00 Canada A%sT 1953 998 -4:00 Halifax A%sT 1954 999 -4:00 - AST 1972 1000 -4:00 Halifax A%sT 1974 1001 -4:00 Canada A%sT 1002 1003 1004# Ontario, Quebec 1005 1006# From Paul Eggert (1996-06-12): 1007# Shanks writes that since 1970 most of Ontario has been like Toronto, 1008# and most of Quebec has been like Montreal. 1009# Thunder Bay skipped DST in 1973. 1010# Many smaller locales did not observe peacetime DST until 1974; 1011# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1012# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 1013 1014# From Mark Brader (2003-07-26): 1015# [According to the Toronto Star] Orillia, Ontario, adopted DST 1016# effective Saturday, 1912-06-22, 22:00; the article mentions that 1017# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 1018# have already done so. In Orillia DST was to run until Saturday, 1019# 1912-08-31 (no time mentioned), but it was met with considerable 1020# hostility from certain segments of the public, and was revoked after 1021# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but 1022# presumably that should be -07-06. (1912-06-19, -07-12; also letters 1023# earlier in June). 1024# 1025# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 1026 1027# From Paul Eggert (1997-10-17): 1028# Mark Brader writes that an article in the 1997-10-14 Toronto Star 1029# says that Atikokan, Ontario currently does not observe DST, 1030# but will vote on 11-10 whether to use EST/EDT. 1031# He also writes that the 1032# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 1033# Ontario Time Act (1990, Chapter T.9) 1034# </a> 1035# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 1036# Officially Atikokan is therefore on CST/CDT, and most likely this report 1037# concerns a non-official time observed as a matter of local practice. 1038# For what it's worth, Shanks says that Atikokan has agreed with 1039# Rainy River ever since standard time was introduced. 1040 1041# From Paul Eggert (2000-10-02): 1042# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 1043# New Osnaburgh observe CST all year, that Big Trout Lake observes 1044# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 1045# violation of the official Ontario rules. 1046# They also write that Quebec east of the -63 meridian is supposed to 1047# observe AST, but residents as far east as Natashquan use EST/EDT, 1048# and residents east of Natashquan use AST. 1049# We probably need Zones for far east Quebec and for Atikokan, 1050# but we don't know when their practices started. 1051 1052# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1053Rule Mont 1917 only - Mar 25 2:00 1:00 D 1054Rule Mont 1917 only - Apr 24 0:00 0 S 1055Rule Mont 1919 only - Mar 31 2:30 1:00 D 1056Rule Mont 1919 only - Oct 25 2:30 0 S 1057Rule Mont 1920 only - May 2 2:30 1:00 D 1058Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S 1059Rule Mont 1921 only - May 1 2:00 1:00 D 1060Rule Mont 1922 only - Apr 30 2:00 1:00 D 1061Rule Mont 1924 only - May 17 2:00 1:00 D 1062Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 1063Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 1064# The 1927-to-1937 rules can be expressed more simply as 1065# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D 1066# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S 1067# The rules below avoid use of 24:00 1068# (which pre-1998 versions of zic cannot handle). 1069Rule Mont 1927 only - May 1 0:00 1:00 D 1070Rule Mont 1927 1932 - Sep lastSun 0:00 0 S 1071Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D 1072Rule Mont 1932 only - May 1 0:00 1:00 D 1073Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D 1074Rule Mont 1933 only - Oct 1 0:00 0 S 1075Rule Mont 1934 1939 - Sep lastSun 0:00 0 S 1076Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D 1077Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 1078Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 1079Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 1080Rule Mont 1957 1973 - Oct lastSun 2:00 0 S 1081 1082Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1083Rule Toronto 1919 only - Oct 26 0:00 0 S 1084Rule Toronto 1920 only - May 2 2:00 1:00 D 1085Rule Toronto 1920 only - Sep 26 0:00 0 S 1086Rule Toronto 1921 only - May 15 2:00 1:00 D 1087Rule Toronto 1921 only - Sep 15 2:00 0 S 1088Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1089# Shanks says 1923-09-19; assume it's a typo and that "-16" was meant. 1090Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1091Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1092# The 1927-to-1939 rules can be expressed more simply as 1093# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1094# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1095# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1096# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1097# The rules below avoid use of Sun>=25 1098# (which pre-2004 versions of zic cannot handle). 1099Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1100Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1101Rule Toronto 1932 only - May 1 2:00 1:00 D 1102Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1103Rule Toronto 1933 only - Oct 1 2:00 0 S 1104Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1105Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1106Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1107Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1108Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1109Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1110Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1111Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1112Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1113# Shanks says Toronto ended DST a week early in 1971, namely on 1971-10-24, 1114# but Mark Brader wrote (2003-05-31) that he checked the 1971-10-30 issue 1115# of the Toronto Star, and it said that DST ended 1971-10-31 as usual. 1116Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1117 1118# From Paul Eggert (2003-07-27): 1119# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1120# Port Arthur, Ontario, the principle of the Bill has been in 1121# operation for the past three years, and in the City of Moose Jaw, 1122# Saskatchewan, for one year." 1123 1124# From David Bryan via Tory Tronrud, Director/Curator, 1125# Thunder Bay Museum (2003-11-12): 1126# There is some suggestion, however, that, by-law or not, daylight 1127# savings time was being practiced in Fort William and Port Arthur 1128# before 1909.... [I]n 1910, the line between the Eastern and Central 1129# Time Zones was permanently moved about two hundred miles west to 1130# include the Thunder Bay area.... When Canada adopted daylight 1131# savings time in 1916, Fort William and Port Arthur, having done so 1132# already, did not change their clocks.... During the Second World 1133# War,... [t]he cities agreed to implement DST during the summer 1134# months for the remainder of the war years. 1135 1136# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1137Zone America/Montreal -4:54:16 - LMT 1884 1138 -5:00 Mont E%sT 1918 1139 -5:00 Canada E%sT 1919 1140 -5:00 Mont E%sT 1942 Feb 9 2:00s 1141 -5:00 Canada E%sT 1946 1142 -5:00 Mont E%sT 1974 1143 -5:00 Canada E%sT 1144Zone America/Toronto -5:17:32 - LMT 1895 1145 -5:00 Canada E%sT 1919 1146 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1147 -5:00 Canada E%sT 1946 1148 -5:00 Toronto E%sT 1974 1149 -5:00 Canada E%sT 1150Zone America/Thunder_Bay -5:57:00 - LMT 1895 1151 -6:00 - CST 1910 1152 -5:00 - EST 1942 1153 -5:00 Canada E%sT 1970 1154 -5:00 Mont E%sT 1973 1155 -5:00 - EST 1974 1156 -5:00 Canada E%sT 1157Zone America/Nipigon -5:53:04 - LMT 1895 1158 -5:00 Canada E%sT 1940 Sep 29 1159 -5:00 1:00 EDT 1942 Feb 9 2:00s 1160 -5:00 Canada E%sT 1161Zone America/Rainy_River -6:17:56 - LMT 1895 1162 -6:00 Canada C%sT 1940 Sep 29 1163 -6:00 1:00 CDT 1942 Feb 9 2:00s 1164 -6:00 Canada C%sT 1165 1166 1167# Manitoba 1168 1169# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1170Rule Winn 1916 only - Apr 23 0:00 1:00 D 1171Rule Winn 1916 only - Sep 17 0:00 0 S 1172Rule Winn 1918 only - Apr 14 2:00 1:00 D 1173Rule Winn 1918 only - Oct 31 2:00 0 S 1174Rule Winn 1937 only - May 16 2:00 1:00 D 1175Rule Winn 1937 only - Sep 26 2:00 0 S 1176Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1177Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1178Rule Winn 1945 only - Sep lastSun 2:00 0 S 1179Rule Winn 1946 only - May 12 2:00 1:00 D 1180Rule Winn 1946 only - Oct 13 2:00 0 S 1181Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1182Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1183Rule Winn 1950 only - May 1 2:00 1:00 D 1184Rule Winn 1950 only - Sep 30 2:00 0 S 1185Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1186Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1187Rule Winn 1959 only - Oct lastSun 2:00 0 S 1188Rule Winn 1960 only - Sep lastSun 2:00 0 S 1189Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1190Rule Winn 1963 only - Sep 22 2:00 0 S 1191Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 1192Rule Winn 1966 1986 - Oct lastSun 2:00 0 S 1193Rule Winn 1987 2006 - Apr Sun>=1 2:00s 1:00 D 1194# From Paul Eggert (2000-10-02): 1195# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from 1196# DST at 03:00 local time. For now, assume it started in 1987. 1197Rule Winn 1987 2006 - Oct lastSun 2:00s 0 S 1198Rule Winn 2007 max - Mar Sun>=8 2:00s 1:00 D 1199Rule Winn 2007 max - Nov Sun>=1 2:00s 0 S 1200# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1201Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1202 -6:00 Winn C%sT 1203 1204 1205# Saskatchewan 1206 1207# From Mark Brader (2003-07-26): 1208# The first actual adoption of DST in Canada was at the municipal 1209# level. As the [Toronto] Star put it (1912-06-07), "While people 1210# elsewhere have long been talking of legislation to save daylight, 1211# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1212# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1213# presumably late evening, as below), and would run until "the end of 1214# the summer". The discrepancy between municipal time and railroad 1215# time was noted. 1216 1217# From Paul Eggert (2003-07-27): 1218# Willett (1914-03) notes that DST "has been in operation ... in the 1219# City of Moose Jaw, Saskatchewan, for one year." 1220 1221# From Paul Eggert (2000-10-02): 1222# Shanks writes that since 1970 most of this region has been like Regina. 1223# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1224# Other western towns (e.g. Lloydminster) are like Edmonton. 1225# Matthews and Vincent (1998) write that Denare Beach and Creighton 1226# are like Winnipeg, in violation of Saskatchewan law. 1227 1228# From W. Jones (1992-11-06): 1229# The. . .below is based on information I got from our law library, the 1230# provincial archives, and the provincial Community Services department. 1231# A precise history would require digging through newspaper archives, and 1232# since you didn't say what you wanted, I didn't bother. 1233# 1234# Saskatchewan is split by a time zone meridian (105W) and over the years 1235# the boundary became pretty ragged as communities near it reevaluated 1236# their affiliations in one direction or the other. In 1965 a provincial 1237# referendum favoured legislating common time practices. 1238# 1239# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1240# Saskatchewan 1978) was proclaimed, and established that the eastern 1241# part of Saskatchewan would use CST year round, that districts in 1242# northwest Saskatchewan would by default follow CST but could opt to 1243# follow Mountain Time rules (thus 1 hour difference in the winter and 1244# zero in the summer), and that districts in southwest Saskatchewan would 1245# by default follow MT but could opt to follow CST. 1246# 1247# It took a few years for the dust to settle (I know one story of a town 1248# on one time zone having its school in another, such that a mom had to 1249# serve her family lunch in two shifts), but presently it seems that only 1250# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1251# rules any more; all other districts appear to have used CST year round 1252# since sometime in the 1960s. 1253 1254# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1255Rule Regina 1918 only - Apr 14 2:00 1:00 D 1256Rule Regina 1918 only - Oct 31 2:00 0 S 1257Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1258Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1259Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1260Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1261Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1262Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1263Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1264Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1265Rule Regina 1945 only - Sep lastSun 2:00 0 S 1266Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1267Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1268Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1269Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1270Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1271Rule Regina 1959 only - Oct lastSun 2:00 0 S 1272# 1273Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1274Rule Swift 1957 only - Oct lastSun 2:00 0 S 1275Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1276Rule Swift 1959 only - Oct lastSun 2:00 0 S 1277Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1278# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1279Zone America/Regina -6:58:36 - LMT 1905 Sep 1280 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1281 -6:00 - CST 1282Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1283 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1284 -7:00 Regina M%sT 1950 1285 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1286 -6:00 - CST 1287 1288 1289# Alberta 1290 1291# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1292Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1293Rule Edm 1918 only - Oct 31 2:00 0 S 1294Rule Edm 1919 only - May 27 2:00 0 S 1295Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1296Rule Edm 1920 only - Oct lastSun 2:00 0 S 1297Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1298Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1299Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1300Rule Edm 1945 only - Sep lastSun 2:00 0 S 1301Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1302Rule Edm 1947 only - Sep lastSun 2:00 0 S 1303Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1304Rule Edm 1967 only - Oct lastSun 2:00 0 S 1305Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1306Rule Edm 1969 only - Oct lastSun 2:00 0 S 1307Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1308Rule Edm 1972 max - Oct lastSun 2:00 0 S 1309Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 1310# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1311Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1312 -7:00 Edm M%sT 1313 1314 1315# British Columbia 1316 1317# From Paul Eggert (2000-10-02): 1318# Shanks writes that since 1970 most of this region has been like Vancouver. 1319# Dawson Creek uses MST. Much of east BC is like Edmonton. 1320# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1321 1322# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1323Rule Vanc 1918 only - Apr 14 2:00 1:00 D 1324Rule Vanc 1918 only - Oct 31 2:00 0 S 1325Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 1326Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 1327Rule Vanc 1945 only - Sep 30 2:00 0 S 1328Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 1329Rule Vanc 1946 only - Oct 13 2:00 0 S 1330Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 1331Rule Vanc 1962 max - Oct lastSun 2:00 0 S 1332Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 1333# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1334Zone America/Vancouver -8:12:28 - LMT 1884 1335 -8:00 Vanc P%sT 1336Zone America/Dawson_Creek -8:00:56 - LMT 1884 1337 -8:00 Canada P%sT 1947 1338 -8:00 Vanc P%sT 1972 Aug 30 2:00 1339 -7:00 - MST 1340 1341 1342# Northwest Territories, Nunavut, Yukon 1343 1344# From Paul Eggert (1999-10-29): 1345# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 1346# Mathew Englander (1996-10-07) gives the following refs: 1347# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 1348# c. 7 defines Yukon standard time as UTC-9. This is still valid; 1349# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 1350# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 1351# * O.I.C. 1980/02 established DST. 1352# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 1353# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 1354 1355# From Rives McDow (1999-09-04): 1356# Nunavut ... moved ... to incorporate the whole territory into one time zone. 1357# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 1358# Nunavut moves to single time zone Oct. 31 1359# </a> 1360# 1361# From Antoine Leca (1999-09-06): 1362# We then need to create a new timezone for the Kitikmeot region of Nunavut 1363# to differentiate it from the Yellowknife region. 1364 1365# From Paul Eggert (1999-09-20): 1366# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 1367# Basic Facts: The New Territory 1368# </a> (1999) reports that Pangnirtung operates on eastern time, 1369# and that Coral Harbour does not observe DST. We don't know when 1370# Pangnirtung switched to eastern time; we'll guess 1995. 1371 1372# From Rives McDow (1999-11-08): 1373# On October 31, when the rest of Nunavut went to Central time, 1374# Pangnirtung wobbled. Here is the result of their wobble: 1375# 1376# The following businesses and organizations in Pangnirtung use Central Time: 1377# 1378# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 1379# Eastern Arctic National Parks, A & D Specialist 1380# 1381# The following businesses and organizations in Pangnirtung use Eastern Time: 1382# 1383# Hamlet office, All other businesses, Both schools, Airport operator 1384# 1385# This has made for an interesting situation there, which warranted the news. 1386# No one there that I spoke with seems concerned, or has plans to 1387# change the local methods of keeping time, as it evidently does not 1388# really interfere with any activities or make things difficult locally. 1389# They plan to celebrate New Year's turn-over twice, one hour apart, 1390# so it appears that the situation will last at least that long. 1391# The Nunavut Intergovernmental Affairs hopes that they will "come to 1392# their senses", but the locals evidently don't see any problem with 1393# the current state of affairs. 1394 1395# From Michaela Rodrigue, writing in the 1396# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 1397# Nunatsiaq News (1999-11-19)</a>: 1398# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 1399# central - or Nunavut time - for government offices, and eastern time 1400# for municipal offices and schools.... Igloolik [was similar but then] 1401# made the switch to central time on Saturday, Nov. 6. 1402 1403# From Paul Eggert (2000-10-02): 1404# Matthews and Vincent (1998) say the following, but we lack histories 1405# for these potential new Zones. 1406# 1407# The Canadian Forces station at Alert uses Eastern Time while the 1408# handful of residents at the Eureka weather station [in the Central 1409# zone] skip daylight savings. Baffin Island, which is crossed by the 1410# Central, Eastern and Atlantic Time zones only uses Eastern Time. 1411# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 1412# Central Time and Southampton Island [in the Central zone] is not 1413# required to use daylight savings. 1414 1415# From 1416# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> 1417# Nunavut now has two time zones 1418# </a> (2000-11-10): 1419# The Nunavut government would allow its employees in Kugluktuk and 1420# Cambridge Bay to operate on central time year-round, putting them 1421# one hour behind the rest of Nunavut for six months during the winter. 1422# At the end of October the two communities had rebelled against 1423# Nunavut's unified time zone, refusing to shift to eastern time with 1424# the rest of the territory for the winter. Cambridge Bay remained on 1425# central time, while Kugluktuk, even farther west, reverted to 1426# mountain time, which they had used before the advent of Nunavut's 1427# unified time zone in 1999. 1428# 1429# From Rives McDow (2001-01-20), quoting the Nunavut government: 1430# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 1431 1432# From Paul Eggert (2000-12-04): 1433# Let's just keep track of the official times for now. 1434 1435# From Rives McDow (2001-03-07): 1436# The premier of Nunavut has issued a ministerial statement advising 1437# that effective 2001-04-01, the territory of Nunavut will revert 1438# back to three time zones (mountain, central, and eastern). Of the 1439# cities in Nunavut, Coral Harbor is the only one that I know of that 1440# has said it will not observe dst, staying on EST year round. I'm 1441# checking for more info, and will get back to you if I come up with 1442# more. 1443# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 1444 1445# From Gwillim Law (2005-05-21): 1446# According to maps at 1447# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg 1448# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg 1449# (both dated 2003), and 1450# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 1451# (from a 1998 Canadian Geographic article), the de facto and de jure time 1452# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 1453# round. Using Google, it's easy to find other websites that confirm this. 1454# I wasn't able to find how far back this time regimen goes, but since it 1455# predates the creation of Nunavut, it probably goes back many years.... 1456# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 1457# 1458# From Paul Eggert (2005-07-26): 1459# For lack of better information, assume that Southampton Island observed 1460# daylight saving only during wartime. 1461 1462# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1463Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 1464Rule NT_YK 1918 only - Oct 27 2:00 0 S 1465Rule NT_YK 1919 only - May 25 2:00 1:00 D 1466Rule NT_YK 1919 only - Nov 1 0:00 0 S 1467Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 1468Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 1469Rule NT_YK 1945 only - Sep 30 2:00 0 S 1470Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 1471Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 1472Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 1473Rule NT_YK 1980 max - Oct lastSun 2:00 0 S 1474Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 1475# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1476Zone America/Pangnirtung -4:22:56 - LMT 1884 1477 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 1478 -5:00 Canada E%sT 1999 Oct 31 2:00 1479 -6:00 Canada C%sT 2000 Oct 29 2:00 1480 -5:00 Canada E%sT 1481Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 1482 -5:00 NT_YK E%sT 1999 Oct 31 2:00 1483 -6:00 Canada C%sT 2000 Oct 29 2:00 1484 -5:00 Canada E%sT 1485Zone America/Coral_Harbour -5:32:40 - LMT 1884 1486 -5:00 NT_YK E%sT 1946 1487 -5:00 - EST 1488Zone America/Rankin_Inlet -6:08:40 - LMT 1884 1489 -6:00 NT_YK C%sT 2000 Oct 29 2:00 1490 -5:00 - EST 2001 Apr 1 3:00 1491 -6:00 Canada C%sT 1492Zone America/Cambridge_Bay -7:00:20 - LMT 1884 1493 -7:00 NT_YK M%sT 1999 Oct 31 2:00 1494 -6:00 Canada C%sT 2000 Oct 29 2:00 1495 -5:00 - EST 2000 Nov 5 0:00 1496 -6:00 - CST 2001 Apr 1 3:00 1497 -7:00 Canada M%sT 1498Zone America/Yellowknife -7:37:24 - LMT 1884 1499 -7:00 NT_YK M%sT 1500Zone America/Inuvik -8:54:00 - LMT 1884 1501 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 1502 -7:00 NT_YK M%sT 1503Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 1504 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 1505 -8:00 NT_YK P%sT 1506Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 1507 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 1508 -8:00 NT_YK P%sT 1509 1510 1511############################################################################### 1512 1513# Mexico 1514 1515# From Paul Eggert (2001-03-05): 1516# The Investigation and Analysis Service of the 1517# Mexican Library of Congress (MLoC) has published a 1518# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> 1519# history of Mexican local time (in Spanish) 1520# </a>. 1521# 1522# Here are the discrepancies between Shanks and the MLoC. 1523# (In all cases we go with the MLoC.) 1524# Shanks reports that Baja was at -8:00 in 1922/1923. 1525# Shanks says the 1930 transition in Baja was 1930-11-16. 1526# Shanks reports no DST during summer 1931. 1527# Shanks reports a transition at 1932-03-30 23:00, not 1932-04-01. 1528# Shanks does not report transitions for Baja in 1945 or 1948. 1529# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23. 1530# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00 1531# on 1997-10-26 at 02:00. 1532 1533# From Gwillim Law (2001-02-20): 1534# There are some other discrepancies between the Decrees page and the 1535# tz database. I think they can best be explained by supposing that 1536# the researchers who prepared the Decrees page failed to find some of 1537# the relevant documents. 1538 1539# From Paul Eggert (2000-07-26): 1540# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 1541# and 1988 DST experiments. Go with spin.com.mx. 1542 1543# From Alan Perry (1996-02-15): 1544# A guy from our Mexico subsidiary finally found the Presidential Decree 1545# outlining the timezone changes in Mexico. 1546# 1547# ------------- Begin Forwarded Message ------------- 1548# 1549# I finally got my hands on the Official Presidential Decree that sets up the 1550# rules for the DST changes. The rules are: 1551# 1552# 1. The country is divided in 3 timezones: 1553# - Baja California Norte (the Mexico/BajaNorte TZ) 1554# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 1555# - The rest of the country (the Mexico/General TZ) 1556# 1557# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 1558# at 2:00 AM, the times in each zone are as follows: 1559# BajaNorte: GMT+7 1560# BajaSur: GMT+6 1561# General: GMT+5 1562# 1563# 3. The rest of the year, the times are as follows: 1564# BajaNorte: GMT+8 1565# BajaSur: GMT+7 1566# General: GMT+6 1567# 1568# The Decree was published in Mexico's Official Newspaper on January 4th. 1569# 1570# -------------- End Forwarded Message -------------- 1571# From Paul Eggert (1996-06-12): 1572# For an English translation of the decree, see 1573# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 1574# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 1575# </a> 1576 1577# From Rives McDow (1998-10-08): 1578# The State of Quintana Roo has reverted back to central STD and DST times 1579# (i.e. UTC -0600 and -0500 as of 1998-08-02). 1580 1581# From Rives McDow (2000-01-10): 1582# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 1583# zone 5 hours from the International Date Line, and will not observe daylight 1584# savings time so as to stay on the same time zone as the southern part of 1585# Arizona year round. 1586 1587# From Jesper Norgaard, translating 1588# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 1589# In Oaxaca, the 55.000 teachers from the Section 22 of the National 1590# Syndicate of Education Workers, refuse to apply daylight saving each 1591# year, so that the more than 10,000 schools work at normal hour the 1592# whole year. 1593 1594# From Gwillim Law (2001-01-19): 1595# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 1596# (translated):... 1597# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 1598# that Summer Time will be reduced from seven to five months, starting 1599# this year.... 1600# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> 1601# [translated], says "summer time will ... take effect on the first Sunday 1602# in May, and end on the last Sunday of September. 1603 1604# From Arthur David Olson (2001-01-25): 1605# The 2001-01-24 traditional Washington Post contained the page one 1606# story "Timely Issue Divides Mexicans."... 1607# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 1608# ... Mexico City Mayor Lopez Obrador "...is threatening to keep 1609# Mexico City and its 20 million residents on a different time than 1610# the rest of the country..." In particular, Lopez Obrador would abolish 1611# observation of Daylight Saving Time. 1612 1613# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> 1614# Official statute published by the Energy Department 1615# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 1616# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). 1617 1618# From Paul Eggert (2001-03-03): 1619# 1620# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> 1621# James F. Smith writes in today's LA Times 1622# </a> 1623# * Sonora will continue to observe standard time. 1624# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that 1625# the Federal District will not adopt DST. 1626# * 4 of 16 district leaders announced they'll ignore the decree. 1627# * The decree does not affect federal-controlled facilities including 1628# the airport, banks, hospitals, and schools. 1629# 1630# For now we'll assume that the Federal District will bow to federal rules. 1631 1632# From Jesper Norgaard (2001-04-01): 1633# I found some references to the Mexican application of daylight 1634# saving, which modifies what I had already sent you, stating earlier 1635# that a number of northern Mexican states would go on daylight 1636# saving. The modification reverts this to only cover Baja California 1637# (Norte), while all other states (except Sonora, who has no daylight 1638# saving all year) will follow the original decree of president 1639# Vicente Fox, starting daylight saving May 6, 2001 and ending 1640# September 30, 2001. 1641# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> 1642# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 1643 1644# From Reuters (2001-09-04): 1645# Mexico's Supreme Court on Tuesday declared that daylight savings was 1646# unconstitutional in Mexico City, creating the possibility the 1647# capital will be in a different time zone from the rest of the nation 1648# next year.... The Supreme Court's ruling takes effect at 2:00 1649# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 1650# standard time. "This is so residents of the Federal District are not 1651# subject to unexpected time changes," a statement from the court said. 1652 1653# From Jesper Norgaard Welen (2002-03-12): 1654# ... consulting my local grocery store(!) and my coworkers, they all insisted 1655# that a new decision had been made to reinstate US style DST in Mexico.... 1656# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 1657# confirms this. Sonora as usual is the only state where DST is not applied. 1658 1659# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1660Rule Mexico 1939 only - Feb 5 0:00 1:00 D 1661Rule Mexico 1939 only - Jun 25 0:00 0 S 1662Rule Mexico 1940 only - Dec 9 0:00 1:00 D 1663Rule Mexico 1941 only - Apr 1 0:00 0 S 1664Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 1665Rule Mexico 1944 only - May 1 0:00 0 S 1666Rule Mexico 1950 only - Feb 12 0:00 1:00 D 1667Rule Mexico 1950 only - Jul 30 0:00 0 S 1668Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 1669Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 1670Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 1671Rule Mexico 2001 only - Sep lastSun 2:00 0 S 1672Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 1673Rule Mexico 2002 max - Oct lastSun 2:00 0 S 1674# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1675# Quintana Roo 1676Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 1677 -6:00 - CST 1981 Dec 23 1678 -5:00 Mexico E%sT 1998 Aug 2 2:00 1679 -6:00 Mexico C%sT 1680# Campeche, Yucatan 1681Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 1682 -6:00 - CST 1981 Dec 23 1683 -5:00 - EST 1982 Dec 2 1684 -6:00 Mexico C%sT 1685# Coahuila, Durango, Nuevo Leon, Tamaulipas 1686Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 1687 -6:00 - CST 1988 1688 -6:00 US C%sT 1989 1689 -6:00 Mexico C%sT 1690# Central Mexico 1691Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 1692 -7:00 - MST 1927 Jun 10 23:00 1693 -6:00 - CST 1930 Nov 15 1694 -7:00 - MST 1931 May 1 23:00 1695 -6:00 - CST 1931 Oct 1696 -7:00 - MST 1932 Apr 1 1697 -6:00 Mexico C%sT 2001 Sep 30 02:00 1698 -6:00 - CST 2002 Feb 20 1699 -6:00 Mexico C%sT 1700# Chihuahua 1701Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 1702 -7:00 - MST 1927 Jun 10 23:00 1703 -6:00 - CST 1930 Nov 15 1704 -7:00 - MST 1931 May 1 23:00 1705 -6:00 - CST 1931 Oct 1706 -7:00 - MST 1932 Apr 1 1707 -6:00 - CST 1996 1708 -6:00 Mexico C%sT 1998 1709 -6:00 - CST 1998 Apr Sun>=1 3:00 1710 -7:00 Mexico M%sT 1711# Sonora 1712Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 1713 -7:00 - MST 1927 Jun 10 23:00 1714 -6:00 - CST 1930 Nov 15 1715 -7:00 - MST 1931 May 1 23:00 1716 -6:00 - CST 1931 Oct 1717 -7:00 - MST 1932 Apr 1 1718 -6:00 - CST 1942 Apr 24 1719 -7:00 - MST 1949 Jan 14 1720 -8:00 - PST 1970 1721 -7:00 Mexico M%sT 1999 1722 -7:00 - MST 1723# Baja California Sur, Nayarit, Sinaloa 1724Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 1725 -7:00 - MST 1927 Jun 10 23:00 1726 -6:00 - CST 1930 Nov 15 1727 -7:00 - MST 1931 May 1 23:00 1728 -6:00 - CST 1931 Oct 1729 -7:00 - MST 1932 Apr 1 1730 -6:00 - CST 1942 Apr 24 1731 -7:00 - MST 1949 Jan 14 1732 -8:00 - PST 1970 1733 -7:00 Mexico M%sT 1734# Baja California 1735Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 1736 -7:00 - MST 1924 1737 -8:00 - PST 1927 Jun 10 23:00 1738 -7:00 - MST 1930 Nov 15 1739 -8:00 - PST 1931 Apr 1 1740 -8:00 1:00 PDT 1931 Sep 30 1741 -8:00 - PST 1942 Apr 24 1742 -8:00 1:00 PWT 1945 Nov 12 1743 -8:00 - PST 1948 Apr 5 1744 -8:00 1:00 PDT 1949 Jan 14 1745 -8:00 - PST 1954 1746 -8:00 CA P%sT 1961 1747 -8:00 - PST 1976 1748 -8:00 US P%sT 1996 1749 -8:00 Mexico P%sT 2001 1750 -8:00 US P%sT 2002 Feb 20 1751 -8:00 Mexico P%sT 1752# From Paul Eggert (2001-03-05): 1753# Formerly there was an America/Ensenada zone, which differed from 1754# America/Tijuana only in that it did not observe DST from 1976 1755# through 1995. This was as per Shanks. However, Guy Harris reports 1756# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and 1757# Tijuana observe DST," which contradicts Shanks but does imply that 1758# DST-observance was a town-by-town matter back then. This concerns 1759# data after 1970 so most likely there should be at least one Zone 1760# other than America/Tijuana for Baja, but it's not clear yet what its 1761# name or contents should be. 1762# 1763# Revillagigedo Is 1764# no information 1765 1766############################################################################### 1767 1768# Anguilla 1769# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1770Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 1771 -4:00 - AST 1772 1773# Antigua and Barbuda 1774# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1775Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 1776 -5:00 - EST 1951 1777 -4:00 - AST 1778 1779# Bahamas 1780# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1781Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 1782Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 1783Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 1784# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1785Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 1786 -5:00 Bahamas E%sT 1787 1788# Barbados 1789# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1790Rule Barb 1977 only - Jun 12 2:00 1:00 D 1791Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1792Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1793Rule Barb 1979 only - Sep 30 2:00 0 S 1794Rule Barb 1980 only - Sep 25 2:00 0 S 1795# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1796Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1797 -3:58:28 - BMT 1932 # Bridgetown Mean Time 1798 -4:00 Barb A%sT 1799 1800# Belize 1801# Whitman entirely disagrees with Shanks; go with Shanks. 1802# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1803Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1804Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1805Rule Belize 1973 only - Dec 5 0:00 1:00 D 1806Rule Belize 1974 only - Feb 9 0:00 0 S 1807Rule Belize 1982 only - Dec 18 0:00 1:00 D 1808Rule Belize 1983 only - Feb 12 0:00 0 S 1809# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1810Zone America/Belize -5:52:48 - LMT 1912 Apr 1811 -6:00 Belize C%sT 1812 1813# Bermuda 1814# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1815Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1816 -4:00 - AST 1974 Apr 28 2:00 1817 -4:00 Bahamas A%sT 1818 1819# Cayman Is 1820# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1821Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1822 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1823 -5:00 - EST 1824 1825# Costa Rica 1826# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1827Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1828Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1829Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 1830# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 1831Rule CR 1991 only - Jul 1 0:00 0 S 1832Rule CR 1992 only - Mar 15 0:00 0 S 1833# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1834# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1835Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1836 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 1837 -6:00 CR C%sT 1838# Coco 1839# no information; probably like America/Costa_Rica 1840 1841# Cuba 1842 1843# From Arthur David Olson (1999-03-29): 1844# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 1845# the Cuban National Team and the Baltimore Orioles was carried live on 1846# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 1847# During the game, play-by-play announcer Jim Hunter noted that 1848# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 1849# Time today." (The "two hour" remark referred to losing one hour of 1850# sleep on 1999-03-28--when the announcers were in Cuba as it switched 1851# to DST--and one more hour on 1999-04-04--when the announcers will have 1852# returned to Baltimore, which switches on that date.) 1853 1854# From Evert van der Veer via Steffen Thorsen (2004-10-28): 1855# Cuba is not going back to standard time this year. 1856# From Paul Eggert (2004-10-28): 1857# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 1858# says that it's due to a problem at the Antonio Guiteras 1859# thermoelectric plant, and says "This October there will be no return 1860# to normal hours (after daylight saving time)". 1861# For now, let's assume that it's a one-year temporary measure. 1862 1863# From Carlos A. Carnero Delgado (2005-11-12): 1864# This year (just like in 2004-2005) there's no change in time zone 1865# adjustment in Cuba. We will stay in daylight saving time: 1866# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html 1867 1868# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1869Rule Cuba 1928 only - Jun 10 0:00 1:00 D 1870Rule Cuba 1928 only - Oct 10 0:00 0 S 1871Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 1872Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 1873Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 1874Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 1875Rule Cuba 1965 only - Jun 1 0:00 1:00 D 1876Rule Cuba 1965 only - Sep 30 0:00 0 S 1877Rule Cuba 1966 only - May 29 0:00 1:00 D 1878Rule Cuba 1966 only - Oct 2 0:00 0 S 1879Rule Cuba 1967 only - Apr 8 0:00 1:00 D 1880Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 1881Rule Cuba 1968 only - Apr 14 0:00 1:00 D 1882Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 1883Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 1884Rule Cuba 1972 1974 - Oct 8 0:00 0 S 1885Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 1886Rule Cuba 1978 only - May 7 0:00 1:00 D 1887Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 1888Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 1889Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 1890Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 1891Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 1892Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 1893Rule Cuba 1996 only - Oct 6 0:00s 0 S 1894Rule Cuba 1997 only - Oct 12 0:00s 0 S 1895Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 1896Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 1897Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D 1898Rule Cuba 2006 max - Oct lastSun 0:00s 0 S 1899 1900# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1901Zone America/Havana -5:29:28 - LMT 1890 1902 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 1903 -5:00 Cuba C%sT 1904 1905# Dominica 1906# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1907Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 1908 -4:00 - AST 1909 1910# Dominican Republic 1911 1912# From Steffen Thorsen (2000-10-30): 1913# Enrique Morales reported to me that the Dominican Republic has changed the 1914# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 1915# http://www.listin.com.do/antes/261000/republica/princi.html 1916 1917# From Paul Eggert (2000-12-04): 1918# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 1919 1920# From Rives McDow (2000-12-01): 1921# Dominican Republic changed its mind and presidential decree on Tuesday, 1922# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 1923# Dominican Republic will be reverting to 8 hours from the International Date 1924# Line, and will not be using DST in the foreseeable future. The reason they 1925# decided to use DST was to be in synch with Puerto Rico, who was also going 1926# to implement DST. When Puerto Rico didn't implement DST, the president 1927# decided to revert. 1928 1929 1930# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1931Rule DR 1966 only - Oct 30 0:00 1:00 D 1932Rule DR 1967 only - Feb 28 0:00 0 S 1933Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 1934Rule DR 1970 only - Feb 21 0:00 0 S 1935Rule DR 1971 only - Jan 20 0:00 0 S 1936Rule DR 1972 1974 - Jan 21 0:00 0 S 1937# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1938Zone America/Santo_Domingo -4:39:36 - LMT 1890 1939 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 1940 -5:00 DR E%sT 1974 Oct 27 1941 -4:00 - AST 2000 Oct 29 02:00 1942 -5:00 US E%sT 2000 Dec 3 01:00 1943 -4:00 - AST 1944 1945# El Salvador 1946# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1947Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 1948Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 1949# There are too many San Salvadors elsewhere, so use America/El_Salvador 1950# instead of America/San_Salvador. 1951# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1952Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 1953 -6:00 Salv C%sT 1954 1955# Grenada 1956# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1957Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 1958 -4:00 - AST 1959 1960# Guadeloupe 1961# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1962Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 1963 -4:00 - AST 1964 1965# Guatemala 1966# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1967Rule Guat 1973 only - Nov 25 0:00 1:00 D 1968Rule Guat 1974 only - Feb 24 0:00 0 S 1969Rule Guat 1983 only - May 21 0:00 1:00 D 1970Rule Guat 1983 only - Sep 22 0:00 0 S 1971Rule Guat 1991 only - Mar 23 0:00 1:00 D 1972Rule Guat 1991 only - Sep 7 0:00 0 S 1973# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1974Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 1975 -6:00 Guat C%sT 1976 1977# Haiti 1978# From Gwillim Law (2005-04-15): 1979# Risto O. Nykanen wrote me that Haiti is now on DST. 1980# I searched for confirmation, and I found a 1981# <a href="http://www.haitianconsulate.org/time.doc"> press release 1982# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 1983# </a>. Translated from French, it says: 1984# 1985# "The Prime Minister's Communication Office notifies the public in general 1986# and the press in particular that, following a decision of the Interior 1987# Ministry and the Territorial Collectivities [I suppose that means the 1988# provinces], Haiti will move to Eastern Daylight Time in the night from next 1989# Saturday the 2nd to Sunday the 3rd. 1990# 1991# "Consequently, the Prime Minister's Communication Office wishes to inform 1992# the population that the country's clocks will be set forward one hour 1993# starting at midnight. This provision will hold until the last Saturday in 1994# October 2005. 1995# 1996# "Port-au-Prince, March 31, 2005" 1997 1998# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1999Rule Haiti 1983 only - May 8 0:00 1:00 D 2000Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 2001Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 2002# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA. 2003Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 2004Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 2005Rule Haiti 2005 only - Apr Sun>=1 0:00 1:00 D 2006Rule Haiti 2005 only - Oct lastSun 0:00 0 S 2007# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2008Zone America/Port-au-Prince -4:49:20 - LMT 1890 2009 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 2010 -5:00 Haiti E%sT 2011 2012# Honduras 2013# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 2014# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2015Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 2016 -6:00 Salv C%sT 2017# 2018# Great Swan I ceded by US to Honduras in 1972 2019 2020# Jamaica 2021 2022# From Bob Devine (1988-01-28): 2023# Follows US rules. 2024 2025# From U. S. Naval Observatory (1989-01-19): 2026# JAMAICA 5 H BEHIND UTC 2027 2028# From Shanks: 2029# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2030Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 2031 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 2032 -5:00 - EST 1974 Apr 28 2:00 2033 -5:00 US E%sT 1984 2034 -5:00 - EST 2035 2036# Martinique 2037# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2038Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 2039 -4:04:20 - FFMT 1911 May # Fort-de-France MT 2040 -4:00 - AST 1980 Apr 6 2041 -4:00 1:00 ADT 1980 Sep 28 2042 -4:00 - AST 2043 2044# Montserrat 2045# From Paul Eggert (1997-08-31): 2046# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 2047# Luckily, Olveston, the current de facto capital, has the same longitude. 2048# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2049Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 2050 -4:00 - AST 2051 2052# Nicaragua 2053# 2054# From Steffen Thorsen (1998-12-29): 2055# Nicaragua seems to be back at -6:00 but I have not been able to find when 2056# they changed from -5:00. 2057# 2058# From Steffen Thorsen (2005-04-12): 2059# I've got reports from 8 different people that Nicaragua just started 2060# DST on Sunday 2005-04-10, in order to save energy because of 2061# expensive petroleum. The exact end date for DST is not yet 2062# announced, only "September" but some sites also say "mid-September". 2063# Some background information is available on the President's official site: 2064# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 2065# The Decree, no 23-2005 is available here: 2066# 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 2067# 2068# From Paul Eggert (2005-05-01): 2069# The decree doesn't say anything about daylight saving, but for now let's 2070# assume that it is daylight saving and that they'll switch back on the 2071# 3rd Sunday in September. 2072# 2073# From Gwillim Law (2005-04-21): 2074# The Associated Press story on the time change, which can be found at 2075# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 2076# and elsewhere, says (fifth paragraph, translated from Spanish): "The last 2077# time that a change of clocks was applied to save energy was in the year 2000 2078# during the Arnoldo Aleman administration."... 2079# The northamerica file says that Nicaragua has been on UTC-6 continuously 2080# since December 1998. I wasn't able to find any details of Nicaraguan time 2081# changes in 2000. Perhaps a note could be added to the northamerica file, to 2082# the effect that we have indirect evidence that DST was observed in 2000. 2083# 2084# From Jesper Norgaard Welen (2005-11-02): 2085# Nicaragua left DST the 2005-10-02 at 00:00 (local time). 2086# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm 2087# (2005-09-26) 2088# 2089# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2090Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 2091Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 2092Rule Nic 1992 only - Jan 1 4:00 1:00 D 2093Rule Nic 1992 only - Sep 24 0:00 0 S 2094Rule Nic 2005 only - Apr 10 0:00 1:00 D 2095Rule Nic 2005 only - Oct 2 0:00 0 S 2096# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2097Zone America/Managua -5:45:08 - LMT 1890 2098 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 2099 -6:00 - CST 1973 May 2100 -5:00 - EST 1975 Feb 16 2101 -6:00 Nic C%sT 1993 Jan 1 4:00 2102 -5:00 - EST 1998 Dec 2103 -6:00 Nic C%sT 2104 2105# Panama 2106# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2107Zone America/Panama -5:18:08 - LMT 1890 2108 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time 2109 -5:00 - EST 2110 2111# Puerto Rico 2112# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 2113# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2114Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 2115 -4:00 - AST 1942 May 3 2116 -4:00 1:00 AWT 1945 Sep 30 2:00 2117 -4:00 - AST 2118 2119# St Kitts-Nevis 2120# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2121Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 2122 -4:00 - AST 2123 2124# St Lucia 2125# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2126Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 2127 -4:04:00 - CMT 1912 # Castries Mean Time 2128 -4:00 - AST 2129 2130# St Pierre and Miquelon 2131# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 2132# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2133Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 2134 -4:00 - AST 1980 May 2135 -3:00 - PMST 1987 # Pierre & Miquelon Time 2136 -3:00 Canada PM%sT 2137 2138# St Vincent and the Grenadines 2139# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2140Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 2141 -4:04:56 - KMT 1912 # Kingstown Mean Time 2142 -4:00 - AST 2143 2144# Turks and Caicos 2145# From Paul Eggert (1998-08-06): 2146# Shanks says they use US DST rules, but IATA SSIM (1991/1998) 2147# says they switch at midnight. Go with IATA SSIM. 2148# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2149Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D 2150Rule TC 1979 max - Oct lastSun 0:00 0 S 2151Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D 2152# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2153Zone America/Grand_Turk -4:44:32 - LMT 1890 2154 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 2155 -5:00 TC E%sT 2156 2157# British Virgin Is 2158# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2159Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 2160 -4:00 - AST 2161 2162# Virgin Is 2163# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2164Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 2165 -4:00 - AST 2166