3# This file is in the public domain, so clarified as of 4# 2009-05-17 by Arthur David Olson. 5 6# also includes Central America and the Caribbean 7 8# This data is by no means authoritative; if you think you know better, 9# go ahead and edit the file (and please send any changes to 10# tz@elsie.nci.nih.gov for general use in the future). 11 12# From Paul Eggert (1999-03-22): 13# A reliable and entertaining source about time zones is 14# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 15 16############################################################################### 17 18# United States 19 20# From Paul Eggert (1999-03-31): 21# Howse writes (pp 121-125) that time zones were invented by 22# Professor Charles Ferdinand Dowd (1825-1904), 23# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 24# His pamphlet ``A System of National Time for Railroads'' (1870) 25# was the result of his proposals at the Convention of Railroad Trunk Lines 26# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 27# but in 1872-05 he moved the proposed origin to Greenwich. 28# His proposal was adopted by the railroads on 1883-11-18 at 12:00, 29# and the most of the country soon followed suit. 30 31# From Paul Eggert (2005-04-16): 32# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 33# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 34 35# From Paul Eggert (2006-03-22): 36# A good source for time zone historical data in the US is 37# Thomas G. Shanks, The American Atlas (5th edition), 38# San Diego: ACS Publications, Inc. (1991). 39# Make sure you have the errata sheet; the book is somewhat useless without it. 40# It is the source for most of the pre-1991 US entries below. 41 42# From Paul Eggert (2001-03-06): 43# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 44# in his whimsical essay ``An Economical Project for Diminishing the Cost 45# of Light'' published in the Journal de Paris (1784-04-26). 46# Not everyone is happy with the results: 47# 48# I don't really care how time is reckoned so long as there is some 49# agreement about it, but I object to being told that I am saving 50# daylight when my reason tells me that I am doing nothing of the kind. 51# I even object to the implication that I am wasting something 52# valuable if I stay in bed after the sun has risen. As an admirer 53# of moonlight I resent the bossy insistence of those who want to 54# reduce my time for enjoying it. At the back of the Daylight Saving 55# scheme I detect the bony, blue-fingered hand of Puritanism, eager 56# to push people into bed earlier, and get them up earlier, to make 57# them healthy, wealthy and wise in spite of themselves. 58# 59# -- Robertson Davies, The diary of Samuel Marchbanks, 60# Clarke, Irwin (1947), XIX, Sunday 61# 62# For more about the first ten years of DST in the United States, see 63# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html"> 64# Ten years of daylight saving from the Pittsburgh standpoint 65# (Carnegie Library of Pittsburgh, 1927)</a>. 66# 67# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 68# However, DST was imposed by the Standard Time Act of 1918, which 69# was the first nationwide legal time standard, and apparently 70# time was just called "Standard Time" or "Daylight Saving Time". 71 72# From Arthur David Olson: 73# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 74# See, for example, the front page of the Saturday, 1974-10-26 75# and Sunday, 1974-10-27 editions of the Washington Post. 76 77# From Arthur David Olson: 78# Before the Uniform Time Act of 1966 took effect in 1967, observance of 79# Daylight Saving Time in the US was by local option, except during wartime. 80 81# From Arthur David Olson (2000-09-25): 82# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 83# In the introduction, Oboler spoke of "Eastern Peace Time." 84# An AltaVista search turned up 85# <a href="http://rowayton.org/rhs/hstaug45.html">: 86# "When the time is announced over the radio now, it is 'Eastern Peace 87# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 88# </a> (August 1945) by way of confirmation. 89 90# From Joseph Gallant citing 91# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 92# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 93# to switch to London for Attlee's address, but the American people 94# never got to hear his speech live. According to one press account, 95# CBS' Bob Trout was first to announce the word of Japan's surrender, 96# but a few seconds later, NBC, ABC and Mutual also flashed the word 97# of surrender, all of whom interrupting the bells of Big Ben in 98# London which were to precede Mr. Attlee's speech. 99 100# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 101# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 102# 103# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 104# Any announcement from Asia would reach St. John's New York newsroom on a 105# wire service teletype machine, which had prescribed signals for major news. 106# Associated Press, for example, would ring five bells before spewing out 107# typed copy of an important story, and 10 bells for news "of transcendental 108# importance." 109# 110# On Aug. 14, stalling while talking steadily into the NBC networks' open 111# microphone, St. John heard five bells and waited only to hear a sixth bell, 112# before announcing confidently: "Ladies and gentlemen, World War II is over. 113# The Japanese have agreed to our surrender terms." 114# 115# He had scored a 20-second scoop on other broadcasters. 116 117# From Arthur David Olson (2005-08-22): 118# Paul has been careful to use the "US" rules only in those locations 119# that are part of the United States; this reflects the real scope of 120# U.S. government action. So even though the "US" rules have changed 121# in the latest release, other countries won't be affected. 122 123# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 124Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 125Rule US 1918 1919 - Oct lastSun 2:00 0 S 126Rule US 1942 only - Feb 9 2:00 1:00 W # War 127Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 128Rule US 1945 only - Sep 30 2:00 0 S 129Rule US 1967 2006 - Oct lastSun 2:00 0 S 130Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 131Rule US 1974 only - Jan 6 2:00 1:00 D 132Rule US 1975 only - Feb 23 2:00 1:00 D 133Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 134Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 135Rule US 2007 max - Mar Sun>=8 2:00 1:00 D 136Rule US 2007 max - Nov Sun>=1 2:00 0 S 137 138# From Arthur David Olson, 2005-12-19 139# We generate the files specified below to guard against old files with 140# obsolete information being left in the time zone binary directory. 141# We limit the list to names that have appeared in previous versions of 142# this time zone package. 143# We do these as separate Zones rather than as Links to avoid problems if 144# a particular place changes whether it observes DST. 145# We put these specifications here in the northamerica file both to 146# increase the chances that they'll actually get compiled and to 147# avoid the need to duplicate the US rules in another file. 148 149# Zone NAME GMTOFF RULES FORMAT [UNTIL] 150Zone EST -5:00 - EST 151Zone MST -7:00 - MST 152Zone HST -10:00 - HST 153Zone EST5EDT -5:00 US E%sT 154Zone CST6CDT -6:00 US C%sT 155Zone MST7MDT -7:00 US M%sT 156Zone PST8PDT -8:00 US P%sT 157 158# From Bob Devine (1988-01-28): 159# ...Alaska (and Hawaii) had the timezone names changed in 1967. 160# old new 161# Pacific Standard Time(PST) -same- 162# Yukon Standard Time(YST) -same- 163# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 164# Nome Standard Time (NT) Bering Standard Time (BST) 165# 166# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 167# The YST zone now covers nearly all of the state, AHST just part 168# of the Aleutian islands. No DST. 169 170# From Paul Eggert (1995-12-19): 171# The tables below use `NST', not `NT', for Nome Standard Time. 172# I invented `CAWT' for Central Alaska War Time. 173 174# From U. S. Naval Observatory (1989-01-19): 175# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 176# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 177# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 178# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 179# USA MOUNTAIN 7 H BEHIND UTC DENVER 180# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 181# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 182# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 183# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 184# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 185# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 186# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 187# USA HAWAII 10 H BEHIND UTC 188# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 189 190# From Arthur David Olson (1989-01-21): 191# The above dates are for 1988. 192# Note the "AKST" and "AKDT" abbreviations, the claim that there's 193# no DST in Samoa, and the claim that there is DST in Alaska and the 194# Aleutians. 195 196# From Arthur David Olson (1988-02-13): 197# Legal standard time zone names, from United States Code (1982 Edition and 198# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 199# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 200# took effect), as explained in sections 263 and 261: 201# (none) 202# United States standard eastern time 203# United States standard mountain time 204# United States standard central time 205# United States standard Pacific time 206# (none) 207# United States standard Alaska time 208# (none) 209# Next, names from 1967-04-01 until 1983-11-30 (the date for 210# public law 98-181): 211# Atlantic standard time 212# eastern standard time 213# central standard time 214# mountain standard time 215# Pacific standard time 216# Yukon standard time 217# Alaska-Hawaii standard time 218# Bering standard time 219# And after 1983-11-30: 220# Atlantic standard time 221# eastern standard time 222# central standard time 223# mountain standard time 224# Pacific standard time 225# Alaska standard time 226# Hawaii-Aleutian standard time 227# Samoa standard time 228# The law doesn't give abbreviations. 229# 230# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 231# Public law 106-564 (2000-12-23) introduced the abbreviation 232# "Chamorro Standard Time" for time in Guam and the Northern Marianas. 233# See the file "australasia". 234 235# From Arthur David Olson, 2005-08-09 236# The following was signed into law on 2005-08-08. 237# 238# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 239# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15 240# U.S.C. 260a(a)) is amended-- 241# (1) by striking `first Sunday of April' and inserting `second 242# Sunday of March'; and 243# (2) by striking `last Sunday of October' and inserting `first 244# Sunday of November'. 245# (b) Effective Date- Subsection (a) shall take effect 1 year after the 246# date of enactment of this Act or March 1, 2007, whichever is later. 247# (c) Report to Congress- Not later than 9 months after the effective 248# date stated in subsection (b), the Secretary shall report to Congress 249# on the impact of this section on energy consumption in the United 250# States. 251# (d) Right to Revert- Congress retains the right to revert the 252# Daylight Saving Time back to the 2005 time schedules once the 253# Department study is complete. 254 255# US eastern time, represented by New York 256 257# Connecticut, Delaware, District of Columbia, most of Florida, 258# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky 259# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, 260# New Hampshire, New Jersey, New York, North Carolina, Ohio, 261# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 262# Vermont, Virginia, West Virginia 263 264# From Dave Cantor (2004-11-02): 265# Early this summer I had the occasion to visit the Mount Washington 266# Observatory weather station atop (of course!) Mount Washington [, NH].... 267# One of the staff members said that the station was on Eastern Standard Time 268# and didn't change their clocks for Daylight Saving ... so that their 269# reports will always have times which are 5 hours behind UTC. 270 271# From Paul Eggert (2005-08-26): 272# According to today's Huntsville Times 273# <http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1> 274# a few towns on Alabama's "eastern border with Georgia, such as Phenix City 275# in Russell County, Lanett in Chambers County and some towns in Lee County, 276# set their watches and clocks on Eastern time." It quotes H.H. "Bubba" 277# Roberts, city administrator in Phenix City. as saying "We are in the Central 278# time zone, but we do go by the Eastern time zone because so many people work 279# in Columbus." 280 281# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 282Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 283Rule NYC 1920 only - Oct lastSun 2:00 0 S 284Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 285Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 286Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 287# Zone NAME GMTOFF RULES FORMAT [UNTIL] 288Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 289 -5:00 US E%sT 1920 290 -5:00 NYC E%sT 1942 291 -5:00 US E%sT 1946 292 -5:00 NYC E%sT 1967 293 -5:00 US E%sT 294 295# US central time, represented by Chicago 296 297# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 298# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 299# Washington counties), Illinois, western Indiana 300# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 301# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 302# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 303# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 304# western Tennessee, most of Texas, Wisconsin 305 306# From Larry M. Smith (2006-04-26) re Wisconsin: 307# http://www.legis.state.wi.us/statutes/Stat0175.pdf ... 308# is currently enforced at the 01:00 time of change. Because the local 309# "bar time" in the state corresponds to 02:00, a number of citations 310# are issued for the "sale of class 'B' alcohol after prohibited 311# hours" within the deviated hour of this change every year.... 312# 313# From Douglas R. Bomberg (2007-03-12): 314# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI 315# Statue 175 closer in synch with the US Congress' intent.... 316# http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf 317 318# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 319Rule Chicago 1920 only - Jun 13 2:00 1:00 D 320Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 321Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 322Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 323Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 324Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 325# Zone NAME GMTOFF RULES FORMAT [UNTIL] 326Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 327 -6:00 US C%sT 1920 328 -6:00 Chicago C%sT 1936 Mar 1 2:00 329 -5:00 - EST 1936 Nov 15 2:00 330 -6:00 Chicago C%sT 1942 331 -6:00 US C%sT 1946 332 -6:00 Chicago C%sT 1967 333 -6:00 US C%sT 334# Oliver County, ND switched from mountain to central time on 1992-10-25. 335Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 336 -7:00 US M%sT 1992 Oct 25 02:00 337 -6:00 US C%sT 338# Morton County, ND, switched from mountain to central time on 339# 2003-10-26, except for the area around Mandan which was already central time. 340# See <http://dmses.dot.gov/docimages/p63/135818.pdf>. 341# Officially this switch also included part of Sioux County, and 342# Jones, Mellette, and Todd Counties in South Dakota; 343# but in practice these other counties were already observing central time. 344# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>. 345Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21 346 -7:00 US M%sT 2003 Oct 26 02:00 347 -6:00 US C%sT 348 349# From Josh Findley (2011-01-21): 350# ...it appears that Mercer County, North Dakota, changed from the 351# mountain time zone to the central time zone at the last transition from 352# daylight-saving to standard time (on Nov. 7, 2010): 353# <a href="http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm"> 354# http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm 355# </a> 356# <a href="http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html"> 357# http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html 358# </a> 359 360# From Andy Lipscomb (2011-01-24): 361# ...according to the Census Bureau, the largest city is Beulah (although 362# it's commonly referred to as Beulah-Hazen, with Hazen being the next 363# largest city in Mercer County). Google Maps places Beulah's city hall 364# at 4715'51" north, 10146'40" west, which yields an offset of 6h47'07". 365 366Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53 367 -7:00 US M%sT 2010 Nov 7 2:00 368 -6:00 US C%sT 369 370# US mountain time, represented by Denver 371# 372# Colorado, far western Kansas, Montana, western 373# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 374# New Mexico, southwestern North Dakota, 375# western South Dakota, far western Texas (El Paso County, Hudspeth County, 376# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 377# 378# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 379Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 380Rule Denver 1920 only - Oct lastSun 2:00 0 S 381Rule Denver 1921 only - May 22 2:00 0 S 382Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 383Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 384# Zone NAME GMTOFF RULES FORMAT [UNTIL] 385Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 386 -7:00 US M%sT 1920 387 -7:00 Denver M%sT 1942 388 -7:00 US M%sT 1946 389 -7:00 Denver M%sT 1967 390 -7:00 US M%sT 391 392# US Pacific time, represented by Los Angeles 393# 394# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 395# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, 396# and the northern three-quarters of Idaho county), 397# most of Nevada, most of Oregon, and Washington 398# 399# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 400Rule CA 1948 only - Mar 14 2:00 1:00 D 401Rule CA 1949 only - Jan 1 2:00 0 S 402Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 403Rule CA 1950 1961 - Sep lastSun 2:00 0 S 404Rule CA 1962 1966 - Oct lastSun 2:00 0 S 405# Zone NAME GMTOFF RULES FORMAT [UNTIL] 406Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 407 -8:00 US P%sT 1946 408 -8:00 CA P%sT 1967 409 -8:00 US P%sT 410 411# Alaska 412# AK%sT is the modern abbreviation for -9:00 per USNO. 413# 414# From Paul Eggert (2001-05-30): 415# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 416# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 417# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 418# also a Friday. Include only the time zone part of this transition, 419# ignoring the switch from Julian to Gregorian, since we can't represent 420# the Julian calendar. 421# 422# As far as we know, none of the exact locations mentioned below were 423# permanently inhabited in 1867 by anyone using either calendar. 424# (Yakutat was colonized by the Russians in 1799, but the settlement 425# was destroyed in 1805 by a Yakutat-kon war party.) However, there 426# were nearby inhabitants in some cases and for our purposes perhaps 427# it's best to simply use the official transition. 428# 429 430# From Steve Ferguson (2011-01-31): 431# The author lives in Alaska and many of the references listed are only 432# available to Alaskan residents. 433# 434# <a href="http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98"> 435# http://www.alaskahistoricalsociety.org/index.cfm?section=discover%20alaska&page=Glimpses%20of%20the%20Past&viewpost=2&ContentId=98 436# </a> 437 438# From Arthur David Olson (2011-02-01): 439# Here's database-relevant material from the 2001 "Alaska History" article: 440# 441# On September 20 [1979]...DOT...officials decreed that on April 27, 442# 1980, Juneau and other nearby communities would move to Yukon Time. 443# Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on 444# Pacific Time. 445# 446# ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the 447# Department's September 1979 decision. Juneau and other communities in 448# northern Southeast reverted to Pacific Time on October 26. 449# 450# On October 28 [1983]...the Metlakatla Indian Community Council voted 451# unanimously to keep the reservation on Pacific Time. 452# 453# According to DOT official Joanne Petrie, Indian reservations are not 454# bound to follow time zones imposed by neighboring jurisdictions. 455# 456# (The last is consistent with how the database now handles the Navajo 457# Nation.) 458 459# From Arthur David Olson (2011-02-09): 460# I just spoke by phone with a staff member at the Metlakatla Indian 461# Community office (using contact information available at 462# <a href="http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla"> 463# http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla 464# </a>). 465# It's shortly after 1:00 here on the east coast of the United States; 466# the staffer said it was shortly after 10:00 there. When I asked whether 467# that meant they were on Pacific time, they said no--they were on their 468# own time. I asked about daylight saving; they said it wasn't used. I 469# did not inquire about practices in the past. 470 471# From Arthur David Olson (2011-08-17): 472# For lack of better information, assume that Metlakatla's 473# abandonment of use of daylight saving resulted from the 1983 vote. 474 475# Zone NAME GMTOFF RULES FORMAT [UNTIL] 476Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 477 -8:57:41 - LMT 1900 Aug 20 12:00 478 -8:00 - PST 1942 479 -8:00 US P%sT 1946 480 -8:00 - PST 1969 481 -8:00 US P%sT 1980 Apr 27 2:00 482 -9:00 US Y%sT 1980 Oct 26 2:00 483 -8:00 US P%sT 1983 Oct 30 2:00 484 -9:00 US Y%sT 1983 Nov 30 485 -9:00 US AK%sT 486Zone America/Sitka 14:58:47 - LMT 1867 Oct 18 487 -9:01:13 - LMT 1900 Aug 20 12:00 488 -8:00 - PST 1942 489 -8:00 US P%sT 1946 490 -8:00 - PST 1969 491 -8:00 US P%sT 1983 Oct 30 2:00 492 -9:00 US Y%sT 1983 Nov 30 493 -9:00 US AK%sT 494Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18 495 -8:46:18 - LMT 1900 Aug 20 12:00 496 -8:00 - PST 1942 497 -8:00 US P%sT 1946 498 -8:00 - PST 1969 499 -8:00 US P%sT 1983 Oct 30 2:00 500 -8:00 - MeST 501Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 502 -9:18:55 - LMT 1900 Aug 20 12:00 503 -9:00 - YST 1942 504 -9:00 US Y%sT 1946 505 -9:00 - YST 1969 506 -9:00 US Y%sT 1983 Nov 30 507 -9:00 US AK%sT 508Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 509 -9:59:36 - LMT 1900 Aug 20 12:00 510 -10:00 - CAT 1942 511 -10:00 US CAT/CAWT 1945 Aug 14 23:00u 512 -10:00 US CAT/CAPT 1946 # Peace 513 -10:00 - CAT 1967 Apr 514 -10:00 - AHST 1969 515 -10:00 US AH%sT 1983 Oct 30 2:00 516 -9:00 US Y%sT 1983 Nov 30 517 -9:00 US AK%sT 518Zone America/Nome 12:58:21 - LMT 1867 Oct 18 519 -11:01:38 - LMT 1900 Aug 20 12:00 520 -11:00 - NST 1942 521 -11:00 US N%sT 1946 522 -11:00 - NST 1967 Apr 523 -11:00 - BST 1969 524 -11:00 US B%sT 1983 Oct 30 2:00 525 -9:00 US Y%sT 1983 Nov 30 526 -9:00 US AK%sT 527Zone America/Adak 12:13:21 - LMT 1867 Oct 18 528 -11:46:38 - LMT 1900 Aug 20 12:00 529 -11:00 - NST 1942 530 -11:00 US N%sT 1946 531 -11:00 - NST 1967 Apr 532 -11:00 - BST 1969 533 -11:00 US B%sT 1983 Oct 30 2:00 534 -10:00 US AH%sT 1983 Nov 30 535 -10:00 US HA%sT 536# The following switches don't quite make our 1970 cutoff. 537# 538# Shanks writes that part of southwest Alaska (e.g. Aniak) 539# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 540# and another part (e.g. Akiak) made the same switch five weeks later. 541# 542# From David Flater (2004-11-09): 543# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 544# Historic Preservation Commission, provided this information, which 545# suggests that Unalaska deviated from statutory time from early 1967 546# possibly until 1983: 547# 548# Minutes of the Unalaska City Council Meeting, January 10, 1967: 549# "Except for St. Paul and Akutan, Unalaska is the only important 550# location not on Alaska Standard Time. The following resolution was 551# made by William Robinson and seconded by Henry Swanson: Be it 552# resolved that the City of Unalaska hereby goes to Alaska Standard 553# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 554# January 14, Alaska Standard Time.) This resolution was passed with 555# three votes for and one against." 556 557# Hawaii 558 559# From Arthur David Olson (2010-12-09): 560# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225 561# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09, 562# the article is available at 563# <a href="http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf"> 564# http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf 565# </a> 566# and indicates that standard time was adopted effective noon, January 567# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight 568# saving for the period between the last Sunday of each April and the 569# last Sunday of each September, but less than a month later repealed the 570# act," (page 220), that year-round daylight saving time was in effect 571# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for 572# when clocks changed) and that clocks were changed by 30 minutes 573# effective the second Sunday of June, 1947 (page 219, with no time of 574# day given for when clocks changed). A footnote for the 1933 changes 575# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933) 576# and Act 163 (approved 21 May 1933)." 577 578# From Arthur David Olson (2011-01-19): 579# The following is from "Laws of the Territory of Hawaii Passed by the 580# Seventeenth Legislature: Regular Session 1933," available (as of 581# 2011-01-19) at American University's Pence Law Library. Page 85: "Act 582# 90...At 2 o'clock ante meridian of the last Sunday in April of each 583# year, the standard time of this Territory shall be advanced one 584# hour...This Act shall take effect upon its approval. Approved this 26th 585# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of 586# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is 587# hereby repealed...This Act shall take effect upon its approval, upon 588# which date the standard time of this Territory shall be restored to 589# that existing immediately prior to the taking effect of said Act 90. 590# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor 591# of the Territory of Hawaii." 592# 593# Note that 1933-05-21 was a Sunday. 594# We're left to guess the time of day when Act 163 was approved; guess noon. 595 596Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 #Schmitt&Cox 597 -10:30 - HST 1933 Apr 30 2:00 #Laws 1933 598 -10:30 1:00 HDT 1933 May 21 12:00 #Laws 1933+12 599 -10:30 - HST 1942 Feb 09 2:00 #Schmitt&Cox+2 600 -10:30 1:00 HDT 1945 Sep 30 2:00 #Schmitt&Cox+2 601 -10:30 - HST 1947 Jun 8 2:00 #Schmitt&Cox+2 602 -10:00 - HST 603 604# Now we turn to US areas that have diverged from the consensus since 1970. 605 606# Arizona mostly uses MST. 607 608# From Paul Eggert (2002-10-20): 609# 610# The information in the rest of this paragraph is derived from the 611# <a href="http://www.dlapr.lib.az.us/links/daylight.htm"> 612# Daylight Saving Time web page (2002-01-23)</a> maintained by the 613# Arizona State Library, Archives and Public Records. 614# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 615# time, but by federal law railroads, airlines, bus lines, military 616# personnel, and some engaged in interstate commerce continued to 617# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 618# Gazette says that was the date the law changed, and that 04-01 was 619# the date the state's clocks would change. In 1945 the State of 620# Arizona used standard time all year, again with exceptions only as 621# mandated by federal law. Arizona observed DST in 1967, but Arizona 622# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 623# 624# Shanks says the 1944 experiment came to an end on 1944-03-17. 625# Go with the Arizona State Library instead. 626 627Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 628 -7:00 US M%sT 1944 Jan 1 00:01 629 -7:00 - MST 1944 Apr 1 00:01 630 -7:00 US M%sT 1944 Oct 1 00:01 631 -7:00 - MST 1967 632 -7:00 US M%sT 1968 Mar 21 633 -7:00 - MST 634# From Arthur David Olson (1988-02-13): 635# A writer from the Inter Tribal Council of Arizona, Inc., 636# notes in private correspondence dated 1987-12-28 that "Presently, only the 637# Navajo Nation participates in the Daylight Saving Time policy, due to its 638# large size and location in three states." (The "only" means that other 639# tribal nations don't use DST.) 640 641Link America/Denver America/Shiprock 642 643# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 644# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 645# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 646# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 647# Teton, Twin Falls, Valley, Washington counties, and the southern 648# quarter of Idaho county) and eastern Oregon (most of Malheur County) 649# switched four weeks late in 1974. 650# 651# Zone NAME GMTOFF RULES FORMAT [UNTIL] 652Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 653 -8:00 US P%sT 1923 May 13 2:00 654 -7:00 US M%sT 1974 655 -7:00 - MST 1974 Feb 3 2:00 656 -7:00 US M%sT 657 658# Indiana 659# 660# For a map of Indiana's time zone regions, see: 661# <a href="http://www.mccsc.edu/time.html"> 662# What time is it in Indiana? 663# </a> (2006-03-01) 664# 665# From Paul Eggert (2007-08-17): 666# Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 667# with the following exceptions: 668# 669# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 670# Vandenburgh, and Warrick counties have been like America/Chicago. 671# 672# - Dearborn and Ohio counties have been like America/New_York. 673# 674# - Clark, Floyd, and Harrison counties have been like 675# America/Kentucky/Louisville. 676# 677# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke, 678# and Switzerland counties have their own time zone histories as noted below. 679# 680# Shanks partitioned Indiana into 345 regions, each with its own time history, 681# and wrote ``Even newspaper reports present contradictory information.'' 682# Those Hoosiers! Such a flighty and changeable people! 683# Fortunately, most of the complexity occurred before our cutoff date of 1970. 684# 685# Other than Indianapolis, the Indiana place names are so nondescript 686# that they would be ambiguous if we left them at the `America' level. 687# So we reluctantly put them all in a subdirectory `America/Indiana'. 688 689# From Paul Eggert (2005-08-16): 690# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006. 691 692# From Nathan Stratton Treadway (2006-03-30): 693# http://www.dot.gov/affairs/dot0406.htm [3705 B] 694# From Deborah Goldsmith (2006-01-18): 695# http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB] 696# From Paul Eggert (2006-01-20): 697# It says "DOT is relocating the time zone boundary in Indiana to move Starke, 698# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the 699# Eastern Time Zone to the Central Time Zone.... The effective date of 700# this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the 701# changeover date from standard time to Daylight Saving Time." 702# Strictly speaking, this means the affected counties will change their 703# clocks twice that night, but this obviously is in error. The intent 704# is that 01:59:59 EST be followed by 02:00:00 CDT. 705 706# From Gwillim Law (2007-02-10): 707# The Associated Press has been reporting that Pulaski County, Indiana is 708# going to switch from Central to Eastern Time on March 11, 2007.... 709# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL 710 711# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 712Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 713Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 714Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 715# Zone NAME GMTOFF RULES FORMAT [UNTIL] 716Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 717 -6:00 US C%sT 1920 718 -6:00 Indianapolis C%sT 1942 719 -6:00 US C%sT 1946 720 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 721 -5:00 - EST 1957 Sep 29 2:00 722 -6:00 - CST 1958 Apr 27 2:00 723 -5:00 - EST 1969 724 -5:00 US E%sT 1971 725 -5:00 - EST 2006 726 -5:00 US E%sT 727# 728# Eastern Crawford County, Indiana, left its clocks alone in 1974, 729# as well as from 1976 through 2005. 730# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 731Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 732Rule Marengo 1951 only - Sep lastSun 2:00 0 S 733Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 734Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 735# Zone NAME GMTOFF RULES FORMAT [UNTIL] 736Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 737 -6:00 US C%sT 1951 738 -6:00 Marengo C%sT 1961 Apr 30 2:00 739 -5:00 - EST 1969 740 -5:00 US E%sT 1974 Jan 6 2:00 741 -6:00 1:00 CDT 1974 Oct 27 2:00 742 -5:00 US E%sT 1976 743 -5:00 - EST 2006 744 -5:00 US E%sT 745# 746# Daviess, Dubois, Knox, and Martin Counties, Indiana, 747# switched from eastern to central time in April 2006, then switched back 748# in November 2007. 749# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 750Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D 751Rule Vincennes 1946 only - Sep lastSun 2:00 0 S 752Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D 753Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S 754Rule Vincennes 1955 only - May 1 0:00 1:00 D 755Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D 756Rule Vincennes 1960 only - Oct lastSun 2:00 0 S 757Rule Vincennes 1961 only - Sep lastSun 2:00 0 S 758Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S 759# Zone NAME GMTOFF RULES FORMAT [UNTIL] 760Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53 761 -6:00 US C%sT 1946 762 -6:00 Vincennes C%sT 1964 Apr 26 2:00 763 -5:00 - EST 1969 764 -5:00 US E%sT 1971 765 -5:00 - EST 2006 Apr 2 2:00 766 -6:00 US C%sT 2007 Nov 4 2:00 767 -5:00 US E%sT 768# 769# Perry County, Indiana, switched from eastern to central time in April 2006. 770# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 771Rule Perry 1946 only - Apr lastSun 2:00 1:00 D 772Rule Perry 1946 only - Sep lastSun 2:00 0 S 773Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D 774Rule Perry 1953 1959 - Sep lastSun 2:00 0 S 775Rule Perry 1955 only - May 1 0:00 1:00 D 776Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D 777Rule Perry 1960 only - Oct lastSun 2:00 0 S 778Rule Perry 1961 only - Sep lastSun 2:00 0 S 779Rule Perry 1962 1963 - Oct lastSun 2:00 0 S 780# Zone NAME GMTOFF RULES FORMAT [UNTIL] 781Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57 782 -6:00 US C%sT 1946 783 -6:00 Perry C%sT 1964 Apr 26 2:00 784 -5:00 - EST 1969 785 -5:00 US E%sT 1971 786 -5:00 - EST 2006 Apr 2 2:00 787 -6:00 US C%sT 788# 789# Pike County, Indiana moved from central to eastern time in 1977, 790# then switched back in 2006, then switched back again in 2007. 791# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 792Rule Pike 1955 only - May 1 0:00 1:00 D 793Rule Pike 1955 1960 - Sep lastSun 2:00 0 S 794Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D 795Rule Pike 1961 1964 - Oct lastSun 2:00 0 S 796# Zone NAME GMTOFF RULES FORMAT [UNTIL] 797Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53 798 -6:00 US C%sT 1955 799 -6:00 Pike C%sT 1965 Apr 25 2:00 800 -5:00 - EST 1966 Oct 30 2:00 801 -6:00 US C%sT 1977 Oct 30 2:00 802 -5:00 - EST 2006 Apr 2 2:00 803 -6:00 US C%sT 2007 Nov 4 2:00 804 -5:00 US E%sT 805# 806# Starke County, Indiana moved from central to eastern time in 1991, 807# then switched back in 2006. 808# From Arthur David Olson (1991-10-28): 809# An article on page A3 of the Sunday, 1991-10-27 Washington Post 810# notes that Starke County switched from Central time to Eastern time as of 811# 1991-10-27. 812# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 813Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 814Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 815Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 816Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 817Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 818# Zone NAME GMTOFF RULES FORMAT [UNTIL] 819Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 820 -6:00 US C%sT 1947 821 -6:00 Starke C%sT 1962 Apr 29 2:00 822 -5:00 - EST 1963 Oct 27 2:00 823 -6:00 US C%sT 1991 Oct 27 2:00 824 -5:00 - EST 2006 Apr 2 2:00 825 -6:00 US C%sT 826# 827# Pulaski County, Indiana, switched from eastern to central time in 828# April 2006 and then switched back in March 2007. 829# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 830Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D 831Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S 832Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S 833Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S 834# Zone NAME GMTOFF RULES FORMAT [UNTIL] 835Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35 836 -6:00 US C%sT 1946 837 -6:00 Pulaski C%sT 1961 Apr 30 2:00 838 -5:00 - EST 1969 839 -5:00 US E%sT 1971 840 -5:00 - EST 2006 Apr 2 2:00 841 -6:00 US C%sT 2007 Mar 11 2:00 842 -5:00 US E%sT 843# 844# Switzerland County, Indiana, did not observe DST from 1973 through 2005. 845# Zone NAME GMTOFF RULES FORMAT [UNTIL] 846Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 847 -6:00 US C%sT 1954 Apr 25 2:00 848 -5:00 - EST 1969 849 -5:00 US E%sT 1973 850 -5:00 - EST 2006 851 -5:00 US E%sT 852 853# Part of Kentucky left its clocks alone in 1974. 854# This also includes Clark, Floyd, and Harrison counties in Indiana. 855# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 856Rule Louisville 1921 only - May 1 2:00 1:00 D 857Rule Louisville 1921 only - Sep 1 2:00 0 S 858Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 859Rule Louisville 1941 only - Sep lastSun 2:00 0 S 860Rule Louisville 1946 only - Jun 2 2:00 0 S 861Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 862Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 863# Zone NAME GMTOFF RULES FORMAT [UNTIL] 864Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 865 -6:00 US C%sT 1921 866 -6:00 Louisville C%sT 1942 867 -6:00 US C%sT 1946 868 -6:00 Louisville C%sT 1961 Jul 23 2:00 869 -5:00 - EST 1968 870 -5:00 US E%sT 1974 Jan 6 2:00 871 -6:00 1:00 CDT 1974 Oct 27 2:00 872 -5:00 US E%sT 873# 874# Wayne County, Kentucky 875# 876# From 877# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 878# Lake Cumberland LIFE 879# </a> (1999-01-29) via WKYM-101.7: 880# Clinton County has joined Wayne County in asking the DoT to change from 881# the Central to the Eastern time zone.... The Wayne County government made 882# the same request in December. And while Russell County officials have not 883# taken action, the majority of respondents to a poll conducted there in 884# August indicated they would like to change to "fast time" also. 885# The three Lake Cumberland counties are the farthest east of any U.S. 886# location in the Central time zone. 887# 888# From Rich Wales (2000-08-29): 889# After prolonged debate, and despite continuing deep differences of opinion, 890# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 891# (-0500) time. They won't "fall back" this year. See Sara Shipley, 892# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 893# 894# From Paul Eggert (2001-07-16): 895# The final rule was published in the 896# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> 897# Federal Register 65, 160 (2000-08-17), page 50154-50158. 898# </a> 899# 900Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 901 -6:00 US C%sT 1946 902 -6:00 - CST 1968 903 -6:00 US C%sT 2000 Oct 29 2:00 904 -5:00 US E%sT 905 906 907# From Rives McDow (2000-08-30): 908# Here ... are all the changes in the US since 1985. 909# Kearny County, KS (put all of county on central; 910# previously split between MST and CST) ... 1990-10 911# Starke County, IN (from CST to EST) ... 1991-10 912# Oliver County, ND (from MST to CST) ... 1992-10 913# West Wendover, NV (from PST TO MST) ... 1999-10 914# Wayne County, KY (from CST to EST) ... 2000-10 915# 916# From Paul Eggert (2001-07-17): 917# We don't know where the line used to be within Kearny County, KS, 918# so omit that change for now. 919# See America/Indiana/Knox for the Starke County, IN change. 920# See America/North_Dakota/Center for the Oliver County, ND change. 921# West Wendover, NV officially switched from Pacific to mountain time on 922# 1999-10-31. See the 923# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> 924# Federal Register 64, 203 (1999-10-21), page 56705-56707. 925# </a> 926# However, the Federal Register says that West Wendover already operated 927# on mountain time, and the rule merely made this official; 928# hence a separate tz entry is not needed. 929 930# Michigan 931# 932# From Bob Devine (1988-01-28): 933# Michigan didn't observe DST from 1968 to 1973. 934# 935# From Paul Eggert (1999-03-31): 936# Shanks writes that Michigan started using standard time on 1885-09-18, 937# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 938# that Detroit kept 939# 940# local time until 1900 when the City Council decreed that clocks should 941# be put back twenty-eight minutes to Central Standard Time. Half the 942# city obeyed, half refused. After considerable debate, the decision 943# was rescinded and the city reverted to Sun time. A derisive offer to 944# erect a sundial in front of the city hall was referred to the 945# Committee on Sewers. Then, in 1905, Central time was adopted 946# by city vote. 947# 948# This story is too entertaining to be false, so go with Howse over Shanks. 949# 950# From Paul Eggert (2001-03-06): 951# Garland (1927) writes ``Cleveland and Detroit advanced their clocks 952# one hour in 1914.'' This change is not in Shanks. We have no more 953# info, so omit this for now. 954# 955# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 956# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 957Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 958Rule Detroit 1948 only - Sep lastSun 2:00 0 S 959Rule Detroit 1967 only - Jun 14 2:00 1:00 D 960Rule Detroit 1967 only - Oct lastSun 2:00 0 S 961# Zone NAME GMTOFF RULES FORMAT [UNTIL] 962Zone America/Detroit -5:32:11 - LMT 1905 963 -6:00 - CST 1915 May 15 2:00 964 -5:00 - EST 1942 965 -5:00 US E%sT 1946 966 -5:00 Detroit E%sT 1973 967 -5:00 US E%sT 1975 968 -5:00 - EST 1975 Apr 27 2:00 969 -5:00 US E%sT 970# 971# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan, 972# switched from EST to CST/CDT in 1973. 973# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 974Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 975Rule Menominee 1946 only - Sep lastSun 2:00 0 S 976Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 977Rule Menominee 1966 only - Oct lastSun 2:00 0 S 978# Zone NAME GMTOFF RULES FORMAT [UNTIL] 979Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 980 -6:00 US C%sT 1946 981 -6:00 Menominee C%sT 1969 Apr 27 2:00 982 -5:00 - EST 1973 Apr 29 2:00 983 -6:00 US C%sT 984 985# Navassa 986# administered by the US Fish and Wildlife Service 987# claimed by US under the provisions of the 1856 Guano Islands Act 988# also claimed by Haiti 989# occupied 1857/1900 by the Navassa Phosphate Co 990# US lighthouse 1917/1996-09 991# currently uninhabited 992# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 993# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 994# Jimmy Skaggs, _The Great Guano Rush_ (1994). 995 996################################################################################ 997 998 999# From Paul Eggert (2006-03-22): 1000# A good source for time zone historical data outside the U.S. is 1001# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 1002# San Diego: ACS Publications, Inc. (2003). 1003# 1004# Gwillim Law writes that a good source 1005# for recent time zone data is the International Air Transport 1006# Association's Standard Schedules Information Manual (IATA SSIM), 1007# published semiannually. Law sent in several helpful summaries 1008# of the IATA's data after 1990. 1009# 1010# Except where otherwise noted, Shanks & Pottenger is the source for 1011# entries through 1990, and IATA SSIM is the source for entries afterwards. 1012# 1013# Other sources occasionally used include: 1014# 1015# Edward W. Whitman, World Time Differences, 1016# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 1017# which I found in the UCLA library. 1018# 1019# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf"> 1020# William Willett, The Waste of Daylight, 19th edition 1021# </a> (1914-03) 1022# 1023# See the `europe' file for Greenland. 1024 1025# Canada 1026 1027# From Alain LaBont<e'> (1994-11-14): 1028# I post here the time zone abbreviations standardized in Canada 1029# for both English and French in the CAN/CSA-Z234.4-89 standard.... 1030# 1031# UTC Standard time Daylight savings time 1032# offset French English French English 1033# -2:30 - - HAT NDT 1034# -3 - - HAA ADT 1035# -3:30 HNT NST - - 1036# -4 HNA AST HAE EDT 1037# -5 HNE EST HAC CDT 1038# -6 HNC CST HAR MDT 1039# -7 HNR MST HAP PDT 1040# -8 HNP PST HAY YDT 1041# -9 HNY YST - - 1042# 1043# HN: Heure Normale ST: Standard Time 1044# HA: Heure Avanc<e'>e DT: Daylight saving Time 1045# 1046# A: de l'Atlantique Atlantic 1047# C: du Centre Central 1048# E: de l'Est Eastern 1049# M: Mountain 1050# N: Newfoundland 1051# P: du Pacifique Pacific 1052# R: des Rocheuses 1053# T: de Terre-Neuve 1054# Y: du Yukon Yukon 1055# 1056# From Paul Eggert (1994-11-22): 1057# Alas, this sort of thing must be handled by localization software. 1058 1059# Unless otherwise specified, the data for Canada are all from Shanks 1060# & Pottenger. 1061 1062# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31, 1063# 2007-03-01): 1064# The British Columbia government announced yesterday that it will 1065# adjust daylight savings next year to align with changes in the 1066# U.S. and the rest of Canada.... 1067# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm 1068# ... 1069# Nova Scotia 1070# Daylight saving time will be extended by four weeks starting in 2007.... 1071# http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf 1072# 1073# [For New Brunswick] the new legislation dictates that the time change is to 1074# be done at 02:00 instead of 00:01. 1075# http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf 1076# ... 1077# Manitoba has traditionally changed the clock every fall at 03:00. 1078# As of 2006, the transition is to take place one hour earlier at 02:00. 1079# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php 1080# ... 1081# [Alberta, Ontario, Quebec] will follow US rules. 1082# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM 1083# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm 1084# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF 1085# ... 1086# P.E.I. will follow US rules.... 1087# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf 1088# ... 1089# Province of Newfoundland and Labrador.... 1090# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm 1091# ... 1092# Yukon 1093# http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf 1094# ... 1095# N.W.T. will follow US rules. Whoever maintains the government web site 1096# does not seem to believe in bookmarks. To see the news release, click the 1097# following link and search for "Daylight Savings Time Change". Press the 1098# "Daylight Savings Time Change" link; it will fire off a popup using 1099# JavaScript. 1100# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive 1101# ... 1102# Nunavut 1103# An amendment to the Interpretation Act was registered on February 19/2007.... 1104# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf 1105 1106# From Paul Eggert (2006-04-25): 1107# H. David Matthews and Mary Vincent's map 1108# <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp"> 1109# "It's about TIME", _Canadian Geographic_ (September-October 1998) 1110# </a> contains detailed boundaries for regions observing nonstandard 1111# time and daylight saving time arrangements in Canada circa 1998. 1112# 1113# INMS, the Institute for National Measurement Standards in Ottawa, has <a 1114# href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php"> 1115# information about standard and daylight saving time zones in Canada. 1116# </a> (updated periodically). 1117# Its unofficial information is often taken from Matthews and Vincent. 1118 1119# From Paul Eggert (2006-06-27): 1120# For now, assume all of DST-observing Canada will fall into line with the 1121# new US DST rules, 1122
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1143Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 1144Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 1145Rule Canada 1945 only - Sep 30 2:00 0 S 1146Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 1147Rule Canada 1974 2006 - Oct lastSun 2:00 0 S 1148Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D 1149Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D 1150Rule Canada 2007 max - Nov Sun>=1 2:00 0 S 1151 1152 1153# Newfoundland and Labrador 1154 1155# From Paul Eggert (2000-10-02): 1156# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 1157# but the only part of Labrador that follows the rules is the 1158# southeast corner, including Port Hope Simpson and Mary's Harbour, 1159# but excluding, say, Black Tickle. 1160 1161# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1162Rule StJohns 1917 only - Apr 8 2:00 1:00 D 1163Rule StJohns 1917 only - Sep 17 2:00 0 S 1164# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger. 1165Rule StJohns 1919 only - May 5 23:00 1:00 D 1166Rule StJohns 1919 only - Aug 12 23:00 0 S 1167# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger. 1168Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 1169Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 1170# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks & 1171# Pottenger. 1172Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 1173Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 1174# Whitman gives the following transitions: 1175# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 1176# but go with Shanks & Pottenger and assume they used Canadian rules. 1177# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 1178# Apr 30 - Sep 24; go with Shanks & Pottenger. 1179Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 1180Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 1181Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 1182Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 1183Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 1184# From Paul Eggert (2000-10-02): 1185# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 1186# at 00:01 local time. For now, assume it started in 1987. 1187 1188# From Michael Pelley (2011-09-12): 1189# We received today, Monday, September 12, 2011, notification that the 1190# changes to the Newfoundland Standard Time Act have been proclaimed. 1191# The change in the Act stipulates that the change from Daylight Savings 1192# Time to Standard Time and from Standard Time to Daylight Savings Time 1193# now occurs at 2:00AM. 1194# ... 1195# <a href="http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm"> 1196# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm 1197# </a> 1198# ... 1199# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery 1200# Office of the Chief Information Officer 1201# Executive Council 1202# Government of Newfoundland & Labrador 1203 1204Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 1205Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S 1206Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 1207Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D 1208Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D 1209Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S 1210# 1211# St John's has an apostrophe, but Posix file names can't have apostrophes. 1212# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1213Zone America/St_Johns -3:30:52 - LMT 1884 1214 -3:30:52 StJohns N%sT 1918 1215 -3:30:52 Canada N%sT 1919 1216 -3:30:52 StJohns N%sT 1935 Mar 30 1217 -3:30 StJohns N%sT 1942 May 11 1218 -3:30 Canada N%sT 1946 1219 -3:30 StJohns N%sT 2011 Nov 1220 -3:30 Canada N%sT 1221 1222# most of east Labrador 1223 1224# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 1225# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1226Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 1227 -3:30:52 - NST 1918 1228 -3:30:52 Canada N%sT 1919 1229 -3:30:52 - NST 1935 Mar 30 1230 -3:30 - NST 1936 1231 -3:30 StJohns N%sT 1942 May 11 1232 -3:30 Canada N%sT 1946 1233 -3:30 StJohns N%sT 1966 Mar 15 2:00 1234 -4:00 StJohns A%sT 2011 Nov 1235 -4:00 Canada A%sT 1236 1237 1238# west Labrador, Nova Scotia, Prince Edward I 1239 1240# From Paul Eggert (2006-03-22): 1241# Shanks & Pottenger write that since 1970 most of this region has been like 1242# Halifax. Many locales did not observe peacetime DST until 1972; 1243# Glace Bay, NS is the largest that we know of. 1244# Shanks & Pottenger also write that Liverpool, NS was the only town 1245# in Canada to observe DST in 1971 but not 1970; for now we'll assume 1246# this is a typo. 1247 1248# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1249Rule Halifax 1916 only - Apr 1 0:00 1:00 D 1250Rule Halifax 1916 only - Oct 1 0:00 0 S 1251Rule Halifax 1920 only - May 9 0:00 1:00 D 1252Rule Halifax 1920 only - Aug 29 0:00 0 S 1253Rule Halifax 1921 only - May 6 0:00 1:00 D 1254Rule Halifax 1921 1922 - Sep 5 0:00 0 S 1255Rule Halifax 1922 only - Apr 30 0:00 1:00 D 1256Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 1257Rule Halifax 1923 only - Sep 4 0:00 0 S 1258Rule Halifax 1924 only - Sep 15 0:00 0 S 1259Rule Halifax 1925 only - Sep 28 0:00 0 S 1260Rule Halifax 1926 only - May 16 0:00 1:00 D 1261Rule Halifax 1926 only - Sep 13 0:00 0 S 1262Rule Halifax 1927 only - May 1 0:00 1:00 D 1263Rule Halifax 1927 only - Sep 26 0:00 0 S 1264Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 1265Rule Halifax 1928 only - Sep 9 0:00 0 S 1266Rule Halifax 1929 only - Sep 3 0:00 0 S 1267Rule Halifax 1930 only - Sep 15 0:00 0 S 1268Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 1269Rule Halifax 1932 only - May 1 0:00 1:00 D 1270Rule Halifax 1933 only - Apr 30 0:00 1:00 D 1271Rule Halifax 1933 only - Oct 2 0:00 0 S 1272Rule Halifax 1934 only - May 20 0:00 1:00 D 1273Rule Halifax 1934 only - Sep 16 0:00 0 S 1274Rule Halifax 1935 only - Jun 2 0:00 1:00 D 1275Rule Halifax 1935 only - Sep 30 0:00 0 S 1276Rule Halifax 1936 only - Jun 1 0:00 1:00 D 1277Rule Halifax 1936 only - Sep 14 0:00 0 S 1278Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 1279Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 1280Rule Halifax 1939 only - May 28 0:00 1:00 D 1281Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 1282Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 1283Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 1284Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 1285Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 1286Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 1287Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 1288Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 1289Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 1290# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1291Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 1292 -4:00 Halifax A%sT 1918 1293 -4:00 Canada A%sT 1919 1294 -4:00 Halifax A%sT 1942 Feb 9 2:00s 1295 -4:00 Canada A%sT 1946 1296 -4:00 Halifax A%sT 1974 1297 -4:00 Canada A%sT 1298Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 1299 -4:00 Canada A%sT 1953 1300 -4:00 Halifax A%sT 1954 1301 -4:00 - AST 1972 1302 -4:00 Halifax A%sT 1974 1303 -4:00 Canada A%sT 1304 1305# New Brunswick 1306 1307# From Paul Eggert (2007-01-31): 1308# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf> 1309# says they changed at 00:01 through 2006, and 1310# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it 1311# clear that this was the case since at least 1993. 1312# For now, assume it started in 1993. 1313 1314# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1315Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D 1316Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S 1317Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D 1318Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S 1319Rule Moncton 1939 only - May 27 1:00 1:00 D 1320Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S 1321Rule Moncton 1940 only - May 19 1:00 1:00 D 1322Rule Moncton 1941 only - May 4 1:00 1:00 D 1323Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D 1324Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S 1325Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S 1326Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D 1327Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S 1328# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1329Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 1330 -5:00 - EST 1902 Jun 15 1331 -4:00 Canada A%sT 1933 1332 -4:00 Moncton A%sT 1942 1333 -4:00 Canada A%sT 1946 1334 -4:00 Moncton A%sT 1973 1335 -4:00 Canada A%sT 1993 1336 -4:00 Moncton A%sT 2007 1337 -4:00 Canada A%sT 1338 1339# Quebec 1340 1341# From Paul Eggert (2006-07-09): 1342# Shanks & Pottenger write that since 1970 most of Quebec has been 1343# like Montreal. 1344 1345# From Paul Eggert (2006-06-27): 1346# Matthews and Vincent (1998) also write that Quebec east of the -63 1347# meridian is supposed to observe AST, but residents as far east as 1348# Natashquan use EST/EDT, and residents east of Natashquan use AST. 1349# In "Official time in Quebec" the Quebec department of justice writes in 1350# http://www.justice.gouv.qc.ca/english/publications/generale/temps-regl-1-a.htm 1351# that "The residents of the Municipality of the 1352# Cote-Nord-du-Golfe-Saint-Laurent and the municipalities of Saint-Augustin, 1353# Bonne-Esperance and Blanc-Sablon apply the Official Time Act as it is 1354# written and use Atlantic standard time all year round. The same applies to 1355# the residents of the Native facilities along the lower North Shore." 1356# <http://www.assnat.qc.ca/eng/37legislature2/Projets-loi/Publics/06-a002.htm> 1357# says this common practice was codified into law as of 2007. 1358# For lack of better info, guess this practice began around 1970, contra to 1359# Shanks & Pottenger who have this region observing AST/ADT. 1360 1361# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1362Rule Mont 1917 only - Mar 25 2:00 1:00 D 1363Rule Mont 1917 only - Apr 24 0:00 0 S 1364Rule Mont 1919 only - Mar 31 2:30 1:00 D 1365Rule Mont 1919 only - Oct 25 2:30 0 S 1366Rule Mont 1920 only - May 2 2:30 1:00 D 1367Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S 1368Rule Mont 1921 only - May 1 2:00 1:00 D 1369Rule Mont 1922 only - Apr 30 2:00 1:00 D 1370Rule Mont 1924 only - May 17 2:00 1:00 D 1371Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 1372Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 1373# The 1927-to-1937 rules can be expressed more simply as 1374# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D 1375# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S 1376# The rules below avoid use of 24:00 1377# (which pre-1998 versions of zic cannot handle). 1378Rule Mont 1927 only - May 1 0:00 1:00 D 1379Rule Mont 1927 1932 - Sep lastSun 0:00 0 S 1380Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D 1381Rule Mont 1932 only - May 1 0:00 1:00 D 1382Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D 1383Rule Mont 1933 only - Oct 1 0:00 0 S 1384Rule Mont 1934 1939 - Sep lastSun 0:00 0 S 1385Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D 1386Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 1387Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 1388Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 1389Rule Mont 1957 1973 - Oct lastSun 2:00 0 S 1390 1391# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1392Zone America/Blanc-Sablon -3:48:28 - LMT 1884 1393 -4:00 Canada A%sT 1970 1394 -4:00 - AST 1395Zone America/Montreal -4:54:16 - LMT 1884 1396 -5:00 Mont E%sT 1918 1397 -5:00 Canada E%sT 1919 1398 -5:00 Mont E%sT 1942 Feb 9 2:00s 1399 -5:00 Canada E%sT 1946 1400 -5:00 Mont E%sT 1974 1401 -5:00 Canada E%sT 1402 1403 1404# Ontario 1405 1406# From Paul Eggert (2006-07-09): 1407# Shanks & Pottenger write that since 1970 most of Ontario has been like 1408# Toronto. 1409# Thunder Bay skipped DST in 1973. 1410# Many smaller locales did not observe peacetime DST until 1974; 1411# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1412# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 1413 1414# From Mark Brader (2003-07-26): 1415# [According to the Toronto Star] Orillia, Ontario, adopted DST 1416# effective Saturday, 1912-06-22, 22:00; the article mentions that 1417# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 1418# have already done so. In Orillia DST was to run until Saturday, 1419# 1912-08-31 (no time mentioned), but it was met with considerable 1420# hostility from certain segments of the public, and was revoked after 1421# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but 1422# presumably that should be -07-06. (1912-06-19, -07-12; also letters 1423# earlier in June). 1424# 1425# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 1426 1427# From Paul Eggert (1997-10-17): 1428# Mark Brader writes that an article in the 1997-10-14 Toronto Star 1429# says that Atikokan, Ontario currently does not observe DST, 1430# but will vote on 11-10 whether to use EST/EDT. 1431# He also writes that the 1432# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 1433# Ontario Time Act (1990, Chapter T.9) 1434# </a> 1435# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 1436# Officially Atikokan is therefore on CST/CDT, and most likely this report 1437# concerns a non-official time observed as a matter of local practice. 1438# 1439# From Paul Eggert (2000-10-02): 1440# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 1441# New Osnaburgh observe CST all year, that Big Trout Lake observes 1442# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 1443# violation of the official Ontario rules. 1444# 1445# From Paul Eggert (2006-07-09): 1446# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the 1447# 2005-07-21 Chronicle-Journal, which said: 1448# 1449# The clocks in Atikokan stay set on standard time year-round. 1450# This means they spend about half the time on central time and 1451# the other half on eastern time. 1452# 1453# For the most part, the system works, Mayor Dennis Brown said. 1454# 1455# "The majority of businesses in Atikokan deal more with Eastern 1456# Canada, but there are some that deal with Western Canada," he 1457# said. "I don't see any changes happening here." 1458# 1459# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang 1460# [New Osnaburgh] follow the same practice." 1461 1462# From Garry McKinnon (2006-07-14) via Chris Walton: 1463# I chatted with a member of my board who has an outstanding memory 1464# and a long history in Atikokan (and in the telecom industry) and he 1465# can say for certain that Atikokan has been practicing the current 1466# time keeping since 1952, at least. 1467 1468# From Paul Eggert (2006-07-17): 1469# Shanks & Pottenger say that Atikokan has agreed with Rainy River 1470# ever since standard time was introduced, but the information from 1471# McKinnon sounds more authoritative. For now, assume that Atikokan 1472# switched to EST immediately after WWII era daylight saving time 1473# ended. This matches the old (less-populous) America/Coral_Harbour 1474# entry since our cutoff date of 1970, so we can move 1475# America/Coral_Harbour to the 'backward' file. 1476 1477# From Mark Brader (2010-03-06): 1478# 1479# Currently the database has: 1480# 1481# # Ontario 1482# 1483# # From Paul Eggert (2006-07-09): 1484# # Shanks & Pottenger write that since 1970 most of Ontario has been like 1485# # Toronto. 1486# # Thunder Bay skipped DST in 1973. 1487# # Many smaller locales did not observe peacetime DST until 1974; 1488# # Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1489# 1490# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom 1491# right corner of page 1, it says that Toronto will return to standard 1492# time at 2 am Sunday morning (which agrees with the database), and that: 1493# 1494# The one-hour setback will go into effect throughout most of Ontario, 1495# except in areas like Windsor which remains on standard time all year. 1496# 1497# Windsor is, of course, a lot larger than Nipigon. 1498# 1499# I only came across this incidentally. I don't know if Windsor began 1500# observing DST when Detroit did, or in 1974, or on some other date. 1501# 1502# By the way, the article continues by noting that: 1503# 1504# Some cities in the United States have pushed the deadline back 1505# three weeks and will change over from daylight saving in October. 1506 1507# From Arthur David Olson (2010-07-17): 1508# 1509# "Standard Time and Time Zones in Canada" appeared in 1510# The Journal of The Royal Astronomical Society of Canada, 1511# volume 26, number 2 (February 1932) and, as of 2010-07-17, 1512# was available at 1513# <a href="http://adsabs.harvard.edu/full/1932JRASC..26...49S"> 1514# http://adsabs.harvard.edu/full/1932JRASC..26...49S 1515# </a> 1516# 1517# It includes the text below (starting on page 57): 1518# 1519# A list of the places in Canada using daylight saving time would 1520# require yearly revision. From information kindly furnished by 1521# the provincial governments and by the postmasters in many cities 1522# and towns, it is found that the following places used daylight sav- 1523# ing in 1930. The information for the province of Quebec is definite, 1524# for the other provinces only approximate: 1525# 1526# Province Daylight saving time used 1527# Prince Edward Island Not used. 1528# Nova Scotia In Halifax only. 1529# New Brunswick In St. John only. 1530# Quebec In the following places: 1531# Montreal Lachine 1532# Quebec Mont-Royal 1533# Levis Iberville 1534# St. Lambert Cap de la Madeleine 1535# Verdun Loretteville 1536# Westmount Richmond 1537# Outremont St. Jerome 1538# Longueuil Greenfield Park 1539# Arvida Waterloo 1540# Chambly-Canton Beaulieu 1541# Melbourne La Tuque 1542# St. Theophile Buckingham 1543# Ontario Used generally in the cities and towns along 1544# the southerly part of the province. Not 1545# used in the northwesterlhy part. 1546# Manitoba Not used. 1547# Saskatchewan In Regina only. 1548# Alberta Not used. 1549# British Columbia Not used. 1550# 1551# With some exceptions, the use of daylight saving may be said to be limited 1552# to those cities and towns lying between Quebec city and Windsor, Ont. 1553 1554# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1555Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1556Rule Toronto 1919 only - Oct 26 0:00 0 S 1557Rule Toronto 1920 only - May 2 2:00 1:00 D 1558Rule Toronto 1920 only - Sep 26 0:00 0 S 1559Rule Toronto 1921 only - May 15 2:00 1:00 D 1560Rule Toronto 1921 only - Sep 15 2:00 0 S 1561Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1562# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16" 1563# was meant. 1564Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1565Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1566# The 1927-to-1939 rules can be expressed more simply as 1567# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1568# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1569# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1570# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1571# The rules below avoid use of Sun>=25 1572# (which pre-2004 versions of zic cannot handle). 1573Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1574Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1575Rule Toronto 1932 only - May 1 2:00 1:00 D 1576Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1577Rule Toronto 1933 only - Oct 1 2:00 0 S 1578Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1579Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1580Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1581Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1582Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1583Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1584Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1585Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1586Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1587# Shanks & Pottenger say Toronto ended DST a week early in 1971, 1588# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this 1589# is wrong, and that he had confirmed it by checking the 1971-10-30 1590# Toronto Star, which said that DST was ending 1971-10-31 as usual. 1591Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1592 1593# From Paul Eggert (2003-07-27): 1594# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1595# Port Arthur, Ontario, the principle of the Bill has been in 1596# operation for the past three years, and in the City of Moose Jaw, 1597# Saskatchewan, for one year." 1598 1599# From David Bryan via Tory Tronrud, Director/Curator, 1600# Thunder Bay Museum (2003-11-12): 1601# There is some suggestion, however, that, by-law or not, daylight 1602# savings time was being practiced in Fort William and Port Arthur 1603# before 1909.... [I]n 1910, the line between the Eastern and Central 1604# Time Zones was permanently moved about two hundred miles west to 1605# include the Thunder Bay area.... When Canada adopted daylight 1606# savings time in 1916, Fort William and Port Arthur, having done so 1607# already, did not change their clocks.... During the Second World 1608# War,... [t]he cities agreed to implement DST during the summer 1609# months for the remainder of the war years. 1610 1611# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1612Zone America/Toronto -5:17:32 - LMT 1895 1613 -5:00 Canada E%sT 1919 1614 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1615 -5:00 Canada E%sT 1946 1616 -5:00 Toronto E%sT 1974 1617 -5:00 Canada E%sT 1618Zone America/Thunder_Bay -5:57:00 - LMT 1895 1619 -6:00 - CST 1910 1620 -5:00 - EST 1942 1621 -5:00 Canada E%sT 1970 1622 -5:00 Mont E%sT 1973 1623 -5:00 - EST 1974 1624 -5:00 Canada E%sT 1625Zone America/Nipigon -5:53:04 - LMT 1895 1626 -5:00 Canada E%sT 1940 Sep 29 1627 -5:00 1:00 EDT 1942 Feb 9 2:00s 1628 -5:00 Canada E%sT 1629Zone America/Rainy_River -6:18:16 - LMT 1895 1630 -6:00 Canada C%sT 1940 Sep 29 1631 -6:00 1:00 CDT 1942 Feb 9 2:00s 1632 -6:00 Canada C%sT 1633Zone America/Atikokan -6:06:28 - LMT 1895 1634 -6:00 Canada C%sT 1940 Sep 29 1635 -6:00 1:00 CDT 1942 Feb 9 2:00s 1636 -6:00 Canada C%sT 1945 Sep 30 2:00 1637 -5:00 - EST 1638 1639 1640# Manitoba 1641 1642# From Rob Douglas (2006-04-06): 1643# the old Manitoba Time Act - as amended by Bill 2, assented to 1644# March 27, 1987 ... said ... 1645# "between two o'clock Central Standard Time in the morning of 1646# the first Sunday of April of each year and two o'clock Central 1647# Standard Time in the morning of the last Sunday of October next 1648# following, one hour in advance of Central Standard Time."... 1649# I believe that the English legislation [of the old time act] had = 1650# been assented to (March 22, 1967).... 1651# Also, as far as I can tell, there was no order-in-council varying 1652# the time of Daylight Saving Time for 2005 and so the provisions of 1653# the 1987 version would apply - the changeover was at 2:00 Central 1654# Standard Time (i.e. not until 3:00 Central Daylight Time). 1655 1656# From Paul Eggert (2006-04-10): 1657# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s) 1658# starting 1966. Since 02:00s is clearly correct for 1967 on, assume 1659# it was also 02:00s in 1966. 1660 1661# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1662Rule Winn 1916 only - Apr 23 0:00 1:00 D 1663Rule Winn 1916 only - Sep 17 0:00 0 S 1664Rule Winn 1918 only - Apr 14 2:00 1:00 D
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1897# Northwest Territories, Nunavut, Yukon 1898 1899# From Paul Eggert (2006-03-22): 1900# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 1901# Mathew Englander (1996-10-07) gives the following refs: 1902# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 1903# c. 7 defines Yukon standard time as UTC-9. This is still valid; 1904# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 1905# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 1906# * O.I.C. 1980/02 established DST. 1907# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 1908# Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go 1909# with Englander. 1910# From Chris Walton (2006-06-26): 1911# Here is a link to the old daylight saving portion of the interpretation 1912# act which was last updated in 1987: 1913# http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf 1914 1915# From Rives McDow (1999-09-04): 1916# Nunavut ... moved ... to incorporate the whole territory into one time zone. 1917# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 1918# Nunavut moves to single time zone Oct. 31 1919# </a> 1920# 1921# From Antoine Leca (1999-09-06): 1922# We then need to create a new timezone for the Kitikmeot region of Nunavut 1923# to differentiate it from the Yellowknife region. 1924 1925# From Paul Eggert (1999-09-20): 1926# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 1927# Basic Facts: The New Territory 1928# </a> (1999) reports that Pangnirtung operates on eastern time, 1929# and that Coral Harbour does not observe DST. We don't know when 1930# Pangnirtung switched to eastern time; we'll guess 1995. 1931 1932# From Rives McDow (1999-11-08): 1933# On October 31, when the rest of Nunavut went to Central time, 1934# Pangnirtung wobbled. Here is the result of their wobble: 1935# 1936# The following businesses and organizations in Pangnirtung use Central Time: 1937# 1938# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 1939# Eastern Arctic National Parks, A & D Specialist 1940# 1941# The following businesses and organizations in Pangnirtung use Eastern Time: 1942# 1943# Hamlet office, All other businesses, Both schools, Airport operator 1944# 1945# This has made for an interesting situation there, which warranted the news. 1946# No one there that I spoke with seems concerned, or has plans to 1947# change the local methods of keeping time, as it evidently does not 1948# really interfere with any activities or make things difficult locally. 1949# They plan to celebrate New Year's turn-over twice, one hour apart, 1950# so it appears that the situation will last at least that long. 1951# The Nunavut Intergovernmental Affairs hopes that they will "come to 1952# their senses", but the locals evidently don't see any problem with 1953# the current state of affairs. 1954 1955# From Michaela Rodrigue, writing in the 1956# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 1957# Nunatsiaq News (1999-11-19)</a>: 1958# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 1959# central - or Nunavut time - for government offices, and eastern time 1960# for municipal offices and schools.... Igloolik [was similar but then] 1961# made the switch to central time on Saturday, Nov. 6. 1962 1963# From Paul Eggert (2000-10-02): 1964# Matthews and Vincent (1998) say the following, but we lack histories 1965# for these potential new Zones. 1966# 1967# The Canadian Forces station at Alert uses Eastern Time while the 1968# handful of residents at the Eureka weather station [in the Central 1969# zone] skip daylight savings. Baffin Island, which is crossed by the 1970# Central, Eastern and Atlantic Time zones only uses Eastern Time. 1971# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 1972# Central Time and Southampton Island [in the Central zone] is not 1973# required to use daylight savings. 1974 1975# From 1976# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> 1977# Nunavut now has two time zones 1978# </a> (2000-11-10): 1979# The Nunavut government would allow its employees in Kugluktuk and 1980# Cambridge Bay to operate on central time year-round, putting them 1981# one hour behind the rest of Nunavut for six months during the winter. 1982# At the end of October the two communities had rebelled against 1983# Nunavut's unified time zone, refusing to shift to eastern time with 1984# the rest of the territory for the winter. Cambridge Bay remained on 1985# central time, while Kugluktuk, even farther west, reverted to 1986# mountain time, which they had used before the advent of Nunavut's 1987# unified time zone in 1999. 1988# 1989# From Rives McDow (2001-01-20), quoting the Nunavut government: 1990# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 1991 1992# From Paul Eggert (2000-12-04): 1993# Let's just keep track of the official times for now. 1994 1995# From Rives McDow (2001-03-07): 1996# The premier of Nunavut has issued a ministerial statement advising 1997# that effective 2001-04-01, the territory of Nunavut will revert 1998# back to three time zones (mountain, central, and eastern). Of the 1999# cities in Nunavut, Coral Harbor is the only one that I know of that 2000# has said it will not observe dst, staying on EST year round. I'm 2001# checking for more info, and will get back to you if I come up with 2002# more. 2003# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 2004 2005# From Gwillim Law (2005-05-21): 2006# According to maps at 2007# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg 2008# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg 2009# (both dated 2003), and 2010# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 2011# (from a 1998 Canadian Geographic article), the de facto and de jure time 2012# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 2013# round. Using Google, it's easy to find other websites that confirm this. 2014# I wasn't able to find how far back this time regimen goes, but since it 2015# predates the creation of Nunavut, it probably goes back many years.... 2016# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 2017# 2018# From Paul Eggert (2005-07-26): 2019# For lack of better information, assume that Southampton Island observed 2020# daylight saving only during wartime. 2021 2022# From Chris Walton (2007-03-01): 2023# ... the community of Resolute (located on Cornwallis Island in 2024# Nunavut) moved from Central Time to Eastern Time last November. 2025# Basically the community did not change its clocks at the end of 2026# daylight saving.... 2027# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html 2028 2029# From Chris Walton (2011-03-21): 2030# Back in 2007 I initiated the creation of a new "zone file" for Resolute 2031# Bay. Resolute Bay is a small community located about 900km north of 2032# the Arctic Circle. The zone file was required because Resolute Bay had 2033# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007. 2034# 2035# According to new information which I received last week, Resolute Bay 2036# went back to using UTC-6 in the winter of 2007-2008... 2037# 2038# On March 11/2007 most of Canada went onto daylight saving. On March 2039# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I 2040# talked to somebody that was both knowledgeable and helpful. I was able 2041# to confirm that Resolute Bay was still operating on UTC-5. It was 2042# explained to me that Resolute Bay had been on the Eastern Time zone 2043# (EST) in the winter, and was now back on the Central Time zone (CDT). 2044# i.e. the time zone had changed twice in the last year but the clocks 2045# had not moved. The residents had to know which time zone they were in 2046# so they could follow the correct TV schedule... 2047# 2048# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I 2049# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature 2050# of the phone call, I decided to seek out an alternate source of 2051# information. I found an e-mail address for somebody by the name of 2052# Stephanie Adams whose job was listed as "Inns North Support Officer for 2053# Arctic Co-operatives." I was under the impression that Stephanie lived 2054# and worked in Resolute Bay... 2055# 2056# On March 14/2011 I phoned the hamlet office again. I was told that 2057# Resolute Bay had been using Central Standard Time over the winter of 2058# 2010-2011 and that the clocks had therefore been moved one hour ahead 2059# on March 13/2011. The person I talked to was aware that Resolute Bay 2060# had previously experimented with Eastern Standard Time but he could not 2061# tell me when the practice had stopped. 2062# 2063# On March 17/2011 I searched the Web to find an e-mail address of 2064# somebody that might be able to tell me exactly when Resolute Bay went 2065# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz 2066# used to be the mayor of Resolute Bay and he apparently owns half the 2067# businesses including "South Camp Inn." This website has some info on 2068# Aziz: 2069# <a href="http://www.uphere.ca/node/493"> 2070# http://www.uphere.ca/node/493 2071# </a> 2072# 2073# I sent Aziz an e-mail asking when Resolute Bay had stopped using 2074# Eastern Standard Time. 2075# 2076# Aziz responded quickly with this: "hi, The time was not changed for the 2077# 1 year only, the following year, the community went back to the old way 2078# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in 2079# the winter Zulu plus 6 hrs" 2080# 2081# This of course conflicted with everything I had ascertained in November 2008. 2082# 2083# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz 2084# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You 2085# may want to check with the weather office in Resolute Bay or do a 2086# search on the weather through Env. Canada. web site" 2087# 2088# If I had realized the Stephanie did not live in Resolute Bay I would 2089# never have contacted her. I now believe that all the information I 2090# obtained in November 2008 should be ignored... 2091# I apologize for reporting incorrect information in 2008. 2092 2093# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2094Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 2095Rule NT_YK 1918 only - Oct 27 2:00 0 S 2096Rule NT_YK 1919 only - May 25 2:00 1:00 D 2097Rule NT_YK 1919 only - Nov 1 0:00 0 S 2098Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 2099Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 2100Rule NT_YK 1945 only - Sep 30 2:00 0 S 2101Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 2102Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 2103Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 2104Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S 2105Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D 2106# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2107# aka Panniqtuuq 2108Zone America/Pangnirtung 0 - zzz 1921 # trading post est. 2109 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 2110 -5:00 Canada E%sT 1999 Oct 31 2:00 2111 -6:00 Canada C%sT 2000 Oct 29 2:00 2112 -5:00 Canada E%sT 2113# formerly Frobisher Bay 2114Zone America/Iqaluit 0 - zzz 1942 Aug # Frobisher Bay est. 2115 -5:00 NT_YK E%sT 1999 Oct 31 2:00 2116 -6:00 Canada C%sT 2000 Oct 29 2:00 2117 -5:00 Canada E%sT 2118# aka Qausuittuq 2119Zone America/Resolute 0 - zzz 1947 Aug 31 # Resolute founded 2120 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2121 -5:00 - EST 2001 Apr 1 3:00 2122 -6:00 Canada C%sT 2006 Oct 29 2:00 2123 -5:00 - EST 2007 Mar 11 3:00 2124 -6:00 Canada C%sT 2125# aka Kangiqiniq 2126Zone America/Rankin_Inlet 0 - zzz 1957 # Rankin Inlet founded 2127 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2128 -5:00 - EST 2001 Apr 1 3:00 2129 -6:00 Canada C%sT 2130# aka Iqaluktuuttiaq 2131Zone America/Cambridge_Bay 0 - zzz 1920 # trading post est.? 2132 -7:00 NT_YK M%sT 1999 Oct 31 2:00 2133 -6:00 Canada C%sT 2000 Oct 29 2:00 2134 -5:00 - EST 2000 Nov 5 0:00 2135 -6:00 - CST 2001 Apr 1 3:00 2136 -7:00 Canada M%sT 2137Zone America/Yellowknife 0 - zzz 1935 # Yellowknife founded? 2138 -7:00 NT_YK M%sT 1980 2139 -7:00 Canada M%sT 2140Zone America/Inuvik 0 - zzz 1953 # Inuvik founded 2141 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 2142 -7:00 NT_YK M%sT 1980 2143 -7:00 Canada M%sT 2144Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 2145 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 2146 -8:00 NT_YK P%sT 1980 2147 -8:00 Canada P%sT 2148Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 2149 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 2150 -8:00 NT_YK P%sT 1980 2151 -8:00 Canada P%sT 2152 2153 2154############################################################################### 2155 2156# Mexico 2157 2158# From Paul Eggert (2001-03-05): 2159# The Investigation and Analysis Service of the 2160# Mexican Library of Congress (MLoC) has published a 2161# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> 2162# history of Mexican local time (in Spanish) 2163# </a>. 2164# 2165# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC. 2166# (In all cases we go with the MLoC.) 2167# S&P report that Baja was at -8:00 in 1922/1923. 2168# S&P say the 1930 transition in Baja was 1930-11-16. 2169# S&P report no DST during summer 1931. 2170# S&P report a transition at 1932-03-30 23:00, not 1932-04-01. 2171 2172# From Gwillim Law (2001-02-20): 2173# There are some other discrepancies between the Decrees page and the 2174# tz database. I think they can best be explained by supposing that 2175# the researchers who prepared the Decrees page failed to find some of 2176# the relevant documents. 2177 2178# From Alan Perry (1996-02-15): 2179# A guy from our Mexico subsidiary finally found the Presidential Decree 2180# outlining the timezone changes in Mexico. 2181# 2182# ------------- Begin Forwarded Message ------------- 2183# 2184# I finally got my hands on the Official Presidential Decree that sets up the 2185# rules for the DST changes. The rules are: 2186# 2187# 1. The country is divided in 3 timezones: 2188# - Baja California Norte (the Mexico/BajaNorte TZ) 2189# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 2190# - The rest of the country (the Mexico/General TZ) 2191# 2192# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 2193# at 2:00 AM, the times in each zone are as follows: 2194# BajaNorte: GMT+7 2195# BajaSur: GMT+6 2196# General: GMT+5 2197# 2198# 3. The rest of the year, the times are as follows: 2199# BajaNorte: GMT+8 2200# BajaSur: GMT+7 2201# General: GMT+6 2202# 2203# The Decree was published in Mexico's Official Newspaper on January 4th. 2204# 2205# -------------- End Forwarded Message -------------- 2206# From Paul Eggert (1996-06-12): 2207# For an English translation of the decree, see 2208# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 2209# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 2210# </a> 2211 2212# From Rives McDow (1998-10-08): 2213# The State of Quintana Roo has reverted back to central STD and DST times 2214# (i.e. UTC -0600 and -0500 as of 1998-08-02). 2215 2216# From Rives McDow (2000-01-10): 2217# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 2218# zone 5 hours from the International Date Line, and will not observe daylight 2219# savings time so as to stay on the same time zone as the southern part of 2220# Arizona year round. 2221 2222# From Jesper Norgaard, translating 2223# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 2224# In Oaxaca, the 55.000 teachers from the Section 22 of the National 2225# Syndicate of Education Workers, refuse to apply daylight saving each 2226# year, so that the more than 10,000 schools work at normal hour the 2227# whole year. 2228 2229# From Gwillim Law (2001-01-19): 2230# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 2231# (translated):... 2232# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 2233# that Summer Time will be reduced from seven to five months, starting 2234# this year.... 2235# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> 2236# [translated], says "summer time will ... take effect on the first Sunday 2237# in May, and end on the last Sunday of September. 2238 2239# From Arthur David Olson (2001-01-25): 2240# The 2001-01-24 traditional Washington Post contained the page one 2241# story "Timely Issue Divides Mexicans."... 2242# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 2243# ... Mexico City Mayor Lopez Obrador "...is threatening to keep 2244# Mexico City and its 20 million residents on a different time than 2245# the rest of the country..." In particular, Lopez Obrador would abolish 2246# observation of Daylight Saving Time. 2247 2248# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> 2249# Official statute published by the Energy Department 2250# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 2251# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). 2252 2253# From Paul Eggert (2001-03-03): 2254# 2255# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> 2256# James F. Smith writes in today's LA Times 2257# </a> 2258# * Sonora will continue to observe standard time. 2259# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that 2260# the Federal District will not adopt DST. 2261# * 4 of 16 district leaders announced they'll ignore the decree. 2262# * The decree does not affect federal-controlled facilities including 2263# the airport, banks, hospitals, and schools. 2264# 2265# For now we'll assume that the Federal District will bow to federal rules. 2266 2267# From Jesper Norgaard (2001-04-01): 2268# I found some references to the Mexican application of daylight 2269# saving, which modifies what I had already sent you, stating earlier 2270# that a number of northern Mexican states would go on daylight 2271# saving. The modification reverts this to only cover Baja California 2272# (Norte), while all other states (except Sonora, who has no daylight 2273# saving all year) will follow the original decree of president 2274# Vicente Fox, starting daylight saving May 6, 2001 and ending 2275# September 30, 2001. 2276# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> 2277# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 2278 2279# From Reuters (2001-09-04): 2280# Mexico's Supreme Court on Tuesday declared that daylight savings was 2281# unconstitutional in Mexico City, creating the possibility the 2282# capital will be in a different time zone from the rest of the nation 2283# next year.... The Supreme Court's ruling takes effect at 2:00 2284# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 2285# standard time. "This is so residents of the Federal District are not 2286# subject to unexpected time changes," a statement from the court said. 2287 2288# From Jesper Norgaard Welen (2002-03-12): 2289# ... consulting my local grocery store(!) and my coworkers, they all insisted 2290# that a new decision had been made to reinstate US style DST in Mexico.... 2291# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 2292# confirms this. Sonora as usual is the only state where DST is not applied. 2293 2294# From Steffen Thorsen (2009-12-28): 2295# 2296# Steffen Thorsen wrote: 2297# > Mexico's House of Representatives has approved a proposal for northern 2298# > Mexico's border cities to share the same daylight saving schedule as 2299# > the United States. 2300# Now this has passed both the Congress and the Senate, so starting from 2301# 2010, some border regions will be the same: 2302# <a href="http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/"> 2303# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/ 2304# </a> 2305# <a href="http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939"> 2306# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939 2307# </a> 2308# (Spanish) 2309# 2310# Could not find the new law text, but the proposed law text changes are here: 2311# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf"> 2312# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf 2313# </a> 2314# (Gaceta Parlamentaria) 2315# 2316# There is also a list of the votes here: 2317# <a href="http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html"> 2318# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html 2319# </a> 2320# 2321# Our page: 2322# <a href="http://www.timeanddate.com/news/time/north-mexico-dst-change.html"> 2323# http://www.timeanddate.com/news/time/north-mexico-dst-change.html 2324# </a> 2325 2326# From Arthur David Olson (2010-01-20): 2327# The page 2328# <a href="http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010"> 2329# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2330# </a> 2331# includes this text: 2332# En los municipios fronterizos de Tijuana y Mexicali en Baja California; 2333# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila; 2334# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en 2335# Tamaulipas, la aplicación de este horario estacional surtirá efecto 2336# desde las dos horas del segundo domingo de marzo y concluirá a las dos 2337# horas del primer domingo de noviembre. 2338# En los municipios fronterizos que se encuentren ubicados en la franja 2339# fronteriza norte en el territorio comprendido entre la línea 2340# internacional y la línea paralela ubicada a una distancia de veinte 2341# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el 2342# interior del país, la aplicación de este horario estacional surtirá 2343# efecto desde las dos horas del segundo domingo de marzo y concluirá a 2344# las dos horas del primer domingo de noviembre. 2345 2346# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2347Rule Mexico 1939 only - Feb 5 0:00 1:00 D 2348Rule Mexico 1939 only - Jun 25 0:00 0 S 2349Rule Mexico 1940 only - Dec 9 0:00 1:00 D 2350Rule Mexico 1941 only - Apr 1 0:00 0 S 2351Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 2352Rule Mexico 1944 only - May 1 0:00 0 S 2353Rule Mexico 1950 only - Feb 12 0:00 1:00 D 2354Rule Mexico 1950 only - Jul 30 0:00 0 S 2355Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 2356Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 2357Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 2358Rule Mexico 2001 only - Sep lastSun 2:00 0 S 2359Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 2360Rule Mexico 2002 max - Oct lastSun 2:00 0 S 2361# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2362# Quintana Roo 2363Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 2364 -6:00 - CST 1981 Dec 23 2365 -5:00 Mexico E%sT 1998 Aug 2 2:00 2366 -6:00 Mexico C%sT 2367# Campeche, Yucatan 2368Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 2369 -6:00 - CST 1981 Dec 23 2370 -5:00 - EST 1982 Dec 2 2371 -6:00 Mexico C%sT 2372# Coahuila, Durango, Nuevo Leon, Tamaulipas (near US border) 2373Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00 2374 -6:00 - CST 1988 2375 -6:00 US C%sT 1989 2376 -6:00 Mexico C%sT 2010 2377 -6:00 US C%sT 2378# Coahuila, Durango, Nuevo Leon, Tamaulipas (away from US border) 2379Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 2380 -6:00 - CST 1988 2381 -6:00 US C%sT 1989 2382 -6:00 Mexico C%sT 2383# Central Mexico 2384Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 2385 -7:00 - MST 1927 Jun 10 23:00 2386 -6:00 - CST 1930 Nov 15 2387 -7:00 - MST 1931 May 1 23:00 2388 -6:00 - CST 1931 Oct 2389 -7:00 - MST 1932 Apr 1 2390 -6:00 Mexico C%sT 2001 Sep 30 02:00 2391 -6:00 - CST 2002 Feb 20 2392 -6:00 Mexico C%sT 2393# Chihuahua (near US border) 2394Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20 2395 -7:00 - MST 1927 Jun 10 23:00 2396 -6:00 - CST 1930 Nov 15 2397 -7:00 - MST 1931 May 1 23:00 2398 -6:00 - CST 1931 Oct 2399 -7:00 - MST 1932 Apr 1 2400 -6:00 - CST 1996 2401 -6:00 Mexico C%sT 1998 2402 -6:00 - CST 1998 Apr Sun>=1 3:00 2403 -7:00 Mexico M%sT 2010 2404 -7:00 US M%sT 2405# Chihuahua (away from US border) 2406Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 2407 -7:00 - MST 1927 Jun 10 23:00 2408 -6:00 - CST 1930 Nov 15 2409 -7:00 - MST 1931 May 1 23:00 2410 -6:00 - CST 1931 Oct 2411 -7:00 - MST 1932 Apr 1 2412 -6:00 - CST 1996 2413 -6:00 Mexico C%sT 1998 2414 -6:00 - CST 1998 Apr Sun>=1 3:00 2415 -7:00 Mexico M%sT 2416# Sonora 2417Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 2418 -7:00 - MST 1927 Jun 10 23:00 2419 -6:00 - CST 1930 Nov 15 2420 -7:00 - MST 1931 May 1 23:00 2421 -6:00 - CST 1931 Oct 2422 -7:00 - MST 1932 Apr 1 2423 -6:00 - CST 1942 Apr 24 2424 -7:00 - MST 1949 Jan 14 2425 -8:00 - PST 1970 2426 -7:00 Mexico M%sT 1999 2427 -7:00 - MST 2428 2429# From Alexander Krivenyshev (2010-04-21): 2430# According to news, Bahía de Banderas (Mexican state of Nayarit) 2431# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to 2432# share the same time zone as nearby city Puerto Vallarta, Jalisco). 2433# 2434# (Spanish) 2435# Bahía de Banderas homologa su horario al del centro del 2436# país, a partir de este domingo 2437# <a href="http://www.nayarit.gob.mx/notes.asp?id=20748"> 2438# http://www.nayarit.gob.mx/notes.asp?id=20748 2439# </a> 2440# 2441# Bahía de Banderas homologa su horario con el del Centro del 2442# País 2443# <a href="http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50"> 2444# http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50" 2445# </a> 2446# 2447# (English) 2448# Puerto Vallarta and Bahía de Banderas: One Time Zone 2449# <a href="http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml"> 2450# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml 2451# </a> 2452# 2453# or 2454# <a href="http://www.worldtimezone.com/dst_news/dst_news_mexico08.html"> 2455# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html 2456# </a> 2457# 2458# "Mexico's Senate approved the amendments to the Mexican Schedule System that 2459# will allow Bahía de Banderas and Puerto Vallarta to share the same time 2460# zone ..." 2461# Baja California Sur, Nayarit, Sinaloa 2462 2463# From Arthur David Olson (2010-05-01): 2464# Use "Bahia_Banderas" to keep the name to fourteen characters. 2465 2466Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 2467 -7:00 - MST 1927 Jun 10 23:00 2468 -6:00 - CST 1930 Nov 15 2469 -7:00 - MST 1931 May 1 23:00 2470 -6:00 - CST 1931 Oct 2471 -7:00 - MST 1932 Apr 1 2472 -6:00 - CST 1942 Apr 24 2473 -7:00 - MST 1949 Jan 14 2474 -8:00 - PST 1970 2475 -7:00 Mexico M%sT 2476 2477Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00 2478 -7:00 - MST 1927 Jun 10 23:00 2479 -6:00 - CST 1930 Nov 15 2480 -7:00 - MST 1931 May 1 23:00 2481 -6:00 - CST 1931 Oct 2482 -7:00 - MST 1932 Apr 1 2483 -6:00 - CST 1942 Apr 24 2484 -7:00 - MST 1949 Jan 14 2485 -8:00 - PST 1970 2486 -7:00 Mexico M%sT 2010 Apr 4 2:00 2487 -6:00 Mexico C%sT 2488 2489# Baja California (near US border) 2490Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 2491 -7:00 - MST 1924 2492 -8:00 - PST 1927 Jun 10 23:00 2493 -7:00 - MST 1930 Nov 15 2494 -8:00 - PST 1931 Apr 1 2495 -8:00 1:00 PDT 1931 Sep 30 2496 -8:00 - PST 1942 Apr 24 2497 -8:00 1:00 PWT 1945 Aug 14 23:00u 2498 -8:00 1:00 PPT 1945 Nov 12 # Peace 2499 -8:00 - PST 1948 Apr 5 2500 -8:00 1:00 PDT 1949 Jan 14 2501 -8:00 - PST 1954 2502 -8:00 CA P%sT 1961 2503 -8:00 - PST 1976 2504 -8:00 US P%sT 1996 2505 -8:00 Mexico P%sT 2001 2506 -8:00 US P%sT 2002 Feb 20 2507 -8:00 Mexico P%sT 2010 2508 -8:00 US P%sT 2509# Baja California (away from US border) 2510Zone America/Santa_Isabel -7:39:28 - LMT 1922 Jan 1 0:20:32 2511 -7:00 - MST 1924 2512 -8:00 - PST 1927 Jun 10 23:00 2513 -7:00 - MST 1930 Nov 15 2514 -8:00 - PST 1931 Apr 1 2515 -8:00 1:00 PDT 1931 Sep 30 2516 -8:00 - PST 1942 Apr 24 2517 -8:00 1:00 PWT 1945 Aug 14 23:00u 2518 -8:00 1:00 PPT 1945 Nov 12 # Peace 2519 -8:00 - PST 1948 Apr 5 2520 -8:00 1:00 PDT 1949 Jan 14 2521 -8:00 - PST 1954 2522 -8:00 CA P%sT 1961 2523 -8:00 - PST 1976 2524 -8:00 US P%sT 1996 2525 -8:00 Mexico P%sT 2001 2526 -8:00 US P%sT 2002 Feb 20 2527 -8:00 Mexico P%sT 2528# From Paul Eggert (2006-03-22): 2529# Formerly there was an America/Ensenada zone, which differed from 2530# America/Tijuana only in that it did not observe DST from 1976 2531# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say 2532# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports 2533# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and 2534# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that 2535# DST-observance was a town-by-town matter back then. This concerns 2536# data after 1970 so most likely there should be at least one Zone 2537# other than America/Tijuana for Baja, but it's not clear yet what its 2538# name or contents should be. 2539# 2540# Revillagigedo Is 2541# no information 2542 2543############################################################################### 2544 2545# Anguilla 2546# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2547Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 2548 -4:00 - AST 2549 2550# Antigua and Barbuda 2551# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2552Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 2553 -5:00 - EST 1951 2554 -4:00 - AST 2555 2556# Bahamas 2557# 2558# From Sue Williams (2006-12-07): 2559# The Bahamas announced about a month ago that they plan to change their DST 2560# rules to sync with the U.S. starting in 2007.... 2561# http://www.jonesbahamas.com/?c=45&a=10412 2562 2563# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2564Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S 2565Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D 2566# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2567Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 2568 -5:00 Bahamas E%sT 1976 2569 -5:00 US E%sT 2570 2571# Barbados 2572# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2573Rule Barb 1977 only - Jun 12 2:00 1:00 D 2574Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 2575Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 2576Rule Barb 1979 only - Sep 30 2:00 0 S 2577Rule Barb 1980 only - Sep 25 2:00 0 S 2578# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2579Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 2580 -3:58:28 - BMT 1932 # Bridgetown Mean Time 2581 -4:00 Barb A%sT 2582 2583# Belize 2584# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger. 2585# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2586Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 2587Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 2588Rule Belize 1973 only - Dec 5 0:00 1:00 D 2589Rule Belize 1974 only - Feb 9 0:00 0 S 2590Rule Belize 1982 only - Dec 18 0:00 1:00 D 2591Rule Belize 1983 only - Feb 12 0:00 0 S 2592# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2593Zone America/Belize -5:52:48 - LMT 1912 Apr 2594 -6:00 Belize C%sT 2595 2596# Bermuda 2597 2598# From Dan Jones, reporting in The Royal Gazette (2006-06-26): 2599 2600# Next year, however, clocks in the US will go forward on the second Sunday 2601# in March, until the first Sunday in November. And, after the Time Zone 2602# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on 2603# Friday, the same thing will happen in Bermuda. 2604# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135 2605 2606# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2607Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 2608 -4:00 - AST 1974 Apr 28 2:00 2609 -4:00 Bahamas A%sT 1976 2610 -4:00 US A%sT 2611 2612# Cayman Is 2613# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2614Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 2615 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 2616 -5:00 - EST 2617 2618# Costa Rica 2619# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2620Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 2621Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 2622Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 2623# IATA SSIM (1991-09) says the following was at 1:00; 2624# go with Shanks & Pottenger. 2625Rule CR 1991 only - Jul 1 0:00 0 S 2626Rule CR 1992 only - Mar 15 0:00 0 S 2627# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 2628# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2629Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 2630 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 2631 -6:00 CR C%sT 2632# Coco 2633# no information; probably like America/Costa_Rica 2634 2635# Cuba 2636 2637# From Arthur David Olson (1999-03-29): 2638# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 2639# the Cuban National Team and the Baltimore Orioles was carried live on 2640# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 2641# During the game, play-by-play announcer Jim Hunter noted that 2642# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 2643# Time today." (The "two hour" remark referred to losing one hour of 2644# sleep on 1999-03-28--when the announcers were in Cuba as it switched 2645# to DST--and one more hour on 1999-04-04--when the announcers will have 2646# returned to Baltimore, which switches on that date.) 2647 2648# From Evert van der Veer via Steffen Thorsen (2004-10-28): 2649# Cuba is not going back to standard time this year. 2650# From Paul Eggert (2006-03-22): 2651# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 2652# says that it's due to a problem at the Antonio Guiteras 2653# thermoelectric plant, and says "This October there will be no return 2654# to normal hours (after daylight saving time)". 2655# For now, let's assume that it's a temporary measure. 2656 2657# From Carlos A. Carnero Delgado (2005-11-12): 2658# This year (just like in 2004-2005) there's no change in time zone 2659# adjustment in Cuba. We will stay in daylight saving time: 2660# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html 2661 2662# From Jesper Norgaard Welen (2006-10-21): 2663# An article in GRANMA INTERNACIONAL claims that Cuba will end 2664# the 3 years of permanent DST next weekend, see 2665# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html 2666# "On Saturday night, October 28 going into Sunday, October 29, at 01:00, 2667# watches should be set back one hour -- going back to 00:00 hours -- returning 2668# to the normal schedule.... 2669 2670# From Paul Eggert (2007-03-02): 2671# http://www.granma.cubaweb.cu/english/news/art89.html, dated yesterday, 2672# says Cuban clocks will advance at midnight on March 10. 2673# For lack of better information, assume Cuba will use US rules, 2674# except that it switches at midnight standard time as usual. 2675# 2676# From Steffen Thorsen (2007-10-25): 2677# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week 2678# earlier - on the last Sunday of October, just like in 2006. 2679# 2680# He supplied these references: 2681# 2682# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES 2683# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm 2684# 2685# From Alex Kryvenishev (2007-10-25): 2686# Here is also article from Granma (Cuba): 2687# 2688# [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre 2689# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html 2690# 2691# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html 2692 2693# From Arthur David Olson (2008-03-09): 2694# I'm in Maryland which is now observing United States Eastern Daylight 2695# Time. At 9:44 local time I used RealPlayer to listen to 2696# <a href="http://media.enet.cu/radioreloj"> 2697# http://media.enet.cu/radioreloj 2698# </a>, a Cuban information station, and heard 2699# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"), 2700# indicating that Cuba is still on standard time. 2701 2702# From Steffen Thorsen (2008-03-12): 2703# It seems that Cuba will start DST on Sunday, 2007-03-16... 2704# It was announced yesterday, according to this source (in Spanish): 2705# <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm"> 2706# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm 2707# </a> 2708# 2709# Some more background information is posted here: 2710# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html"> 2711# http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html 2712# </a> 2713# 2714# The article also says that Cuba has been observing DST since 1963, 2715# while Shanks (and tzdata) has 1965 as the first date (except in the 2716# 1940's). Many other web pages in Cuba also claim that it has been 2717# observed since 1963, but with the exception of 1970 - an exception 2718# which is not present in tzdata/Shanks. So there is a chance we need to 2719# change some historic records as well. 2720# 2721# One example: 2722# <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm"> 2723# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm 2724# </a> 2725 2726# From Jesper Norgaard Welen (2008-03-13): 2727# The Cuban time change has just been confirmed on the most authoritative 2728# web site, the Granma. Please check out 2729# <a href="http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html"> 2730# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html 2731# </a> 2732# 2733# Basically as expected after Steffen Thorsens information, the change 2734# will take place midnight between Saturday and Sunday. 2735 2736# From Arthur David Olson (2008-03-12): 2737# Assume Sun>=15 (third Sunday) going forward. 2738 2739# From Alexander Krivenyshev (2009-03-04) 2740# According to the Radio Reloj - Cuba will start Daylight Saving Time on 2741# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009- 2742# not on midnight March 14 / March 15 as previously thought. 2743# 2744# <a href="http://www.worldtimezone.com/dst_news/dst_news_cuba05.html"> 2745# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html 2746# (in Spanish) 2747# </a> 2748 2749# From Arthur David Olson (2009-03-09) 2750# I listened over the Internet to 2751# <a href="http://media.enet.cu/readioreloj"> 2752# http://media.enet.cu/readioreloj 2753# </a> 2754# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the 2755# the time was announced as "diez cinco"--the same time as here, indicating 2756# that has indeed switched to DST. Assume second Sunday from 2009 forward. 2757 2758# From Steffen Thorsen (2011-03-08): 2759# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00 2760# this year. Nothing about the end date known so far (if that has 2761# changed at all). 2762# 2763# Source: 2764# <a href="http://granma.co.cu/2011/03/08/nacional/artic01.html"> 2765# http://granma.co.cu/2011/03/08/nacional/artic01.html 2766# </a> 2767# 2768# Our info: 2769# <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html"> 2770# http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html 2771# </a> 2772# 2773# From Steffen Thorsen (2011-10-30) 2774# Cuba will end DST two weeks later this year. Instead of going back 2775# tonight, it has been delayed to 2011-11-13 at 01:00. 2776# 2777# One source (Spanish) 2778# <a href="http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html"> 2779# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html 2780# </a> 2781# 2782# Our page: 2783# <a href="http://www.timeanddate.com/news/time/cuba-time-changes-2011.html"> 2784# http://www.timeanddate.com/news/time/cuba-time-changes-2011.html 2785# </a> 2786 2787# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2788Rule Cuba 1928 only - Jun 10 0:00 1:00 D 2789Rule Cuba 1928 only - Oct 10 0:00 0 S 2790Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 2791Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 2792Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 2793Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 2794Rule Cuba 1965 only - Jun 1 0:00 1:00 D 2795Rule Cuba 1965 only - Sep 30 0:00 0 S 2796Rule Cuba 1966 only - May 29 0:00 1:00 D 2797Rule Cuba 1966 only - Oct 2 0:00 0 S 2798Rule Cuba 1967 only - Apr 8 0:00 1:00 D 2799Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 2800Rule Cuba 1968 only - Apr 14 0:00 1:00 D 2801Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 2802Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 2803Rule Cuba 1972 1974 - Oct 8 0:00 0 S 2804Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 2805Rule Cuba 1978 only - May 7 0:00 1:00 D 2806Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 2807Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 2808Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 2809Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 2810Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 2811Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 2812Rule Cuba 1996 only - Oct 6 0:00s 0 S 2813Rule Cuba 1997 only - Oct 12 0:00s 0 S 2814Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 2815Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 2816Rule Cuba 2000 2004 - Apr Sun>=1 0:00s 1:00 D 2817Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S 2818Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D 2819Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D 2820Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D 2821Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D 2822Rule Cuba 2011 only - Nov 13 0:00s 0 S 2823Rule Cuba 2012 max - Mar Sun>=8 0:00s 1:00 D 2824Rule Cuba 2012 max - Oct lastSun 0:00s 0 S 2825 2826# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2827Zone America/Havana -5:29:28 - LMT 1890 2828 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 2829 -5:00 Cuba C%sT 2830 2831# Dominica 2832# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2833Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 2834 -4:00 - AST 2835 2836# Dominican Republic 2837 2838# From Steffen Thorsen (2000-10-30): 2839# Enrique Morales reported to me that the Dominican Republic has changed the 2840# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 2841# http://www.listin.com.do/antes/261000/republica/princi.html 2842 2843# From Paul Eggert (2000-12-04): 2844# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 2845 2846# From Rives McDow (2000-12-01): 2847# Dominican Republic changed its mind and presidential decree on Tuesday, 2848# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 2849# Dominican Republic will be reverting to 8 hours from the International Date 2850# Line, and will not be using DST in the foreseeable future. The reason they 2851# decided to use DST was to be in synch with Puerto Rico, who was also going 2852# to implement DST. When Puerto Rico didn't implement DST, the president 2853# decided to revert. 2854 2855 2856# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2857Rule DR 1966 only - Oct 30 0:00 1:00 D 2858Rule DR 1967 only - Feb 28 0:00 0 S 2859Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 2860Rule DR 1970 only - Feb 21 0:00 0 S 2861Rule DR 1971 only - Jan 20 0:00 0 S 2862Rule DR 1972 1974 - Jan 21 0:00 0 S 2863# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2864Zone America/Santo_Domingo -4:39:36 - LMT 1890 2865 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 2866 -5:00 DR E%sT 1974 Oct 27 2867 -4:00 - AST 2000 Oct 29 02:00 2868 -5:00 US E%sT 2000 Dec 3 01:00 2869 -4:00 - AST 2870 2871# El Salvador 2872 2873# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2874Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 2875Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 2876# There are too many San Salvadors elsewhere, so use America/El_Salvador 2877# instead of America/San_Salvador. 2878# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2879Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 2880 -6:00 Salv C%sT 2881 2882# Grenada 2883# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2884Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 2885 -4:00 - AST 2886 2887# Guadeloupe 2888# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2889Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 2890 -4:00 - AST 2891# St Barthelemy 2892Link America/Guadeloupe America/St_Barthelemy 2893# St Martin (French part) 2894Link America/Guadeloupe America/Marigot 2895 2896# Guatemala 2897# 2898# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen: 2899# Diario Co Latino, at 2900# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079, 2901# says in an article dated 2006-04-19 that the Guatemalan government had 2902# decided on that date to advance official time by 60 minutes, to lessen the 2903# impact of the elevated cost of oil.... Daylight saving time will last from 2904# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified). 2905# From Paul Eggert (2006-06-22): 2906# The Ministry of Energy and Mines, press release CP-15/2006 2907# (2006-04-19), says DST ends at 24:00. See 2908# <http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf>. 2909 2910# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2911Rule Guat 1973 only - Nov 25 0:00 1:00 D 2912Rule Guat 1974 only - Feb 24 0:00 0 S 2913Rule Guat 1983 only - May 21 0:00 1:00 D 2914Rule Guat 1983 only - Sep 22 0:00 0 S 2915Rule Guat 1991 only - Mar 23 0:00 1:00 D 2916Rule Guat 1991 only - Sep 7 0:00 0 S 2917Rule Guat 2006 only - Apr 30 0:00 1:00 D 2918Rule Guat 2006 only - Oct 1 0:00 0 S 2919# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2920Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 2921 -6:00 Guat C%sT 2922 2923# Haiti 2924# From Gwillim Law (2005-04-15): 2925# Risto O. Nykanen wrote me that Haiti is now on DST. 2926# I searched for confirmation, and I found a 2927# <a href="http://www.haitianconsulate.org/time.doc"> press release 2928# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 2929# </a>. Translated from French, it says: 2930# 2931# "The Prime Minister's Communication Office notifies the public in general 2932# and the press in particular that, following a decision of the Interior 2933# Ministry and the Territorial Collectivities [I suppose that means the 2934# provinces], Haiti will move to Eastern Daylight Time in the night from next 2935# Saturday the 2nd to Sunday the 3rd. 2936# 2937# "Consequently, the Prime Minister's Communication Office wishes to inform 2938# the population that the country's clocks will be set forward one hour 2939# starting at midnight. This provision will hold until the last Saturday in 2940# October 2005. 2941# 2942# "Port-au-Prince, March 31, 2005" 2943# 2944# From Steffen Thorsen (2006-04-04): 2945# I have been informed by users that Haiti observes DST this year like 2946# last year, so the current "only" rule for 2005 might be changed to a 2947# "max" rule or to last until 2006. (Who knows if they will observe DST 2948# next year or if they will extend their DST like US/Canada next year). 2949# 2950# I have found this article about it (in French): 2951# http://www.haitipressnetwork.com/news.cfm?articleID=7612 2952# 2953# The reason seems to be an energy crisis. 2954 2955# From Stephen Colebourne (2007-02-22): 2956# Some IATA info: Haiti won't be having DST in 2007. 2957 2958 2959# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2960Rule Haiti 1983 only - May 8 0:00 1:00 D 2961Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 2962Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 2963# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. 2964# Go with IATA. 2965Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 2966Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 2967Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D 2968Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S 2969# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2970Zone America/Port-au-Prince -4:49:20 - LMT 1890 2971 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 2972 -5:00 Haiti E%sT 2973 2974# Honduras 2975# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1. 2976 2977# From Paul Eggert (2006-05-05): 2978# worldtimezone.com reports a 2006-05-02 Spanish-language AP article 2979# saying Honduras will start using DST midnight Saturday, effective 4 2980# months until September. La Tribuna reported today 2981# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president 2982# of Honduras, refused to back down on this. 2983 2984# From Jesper Norgaard Welen (2006-08-08): 2985# It seems that Honduras has returned from DST to standard time this Monday at 2986# 00:00 hours (prolonging Sunday to 25 hours duration). 2987# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html 2988 2989# From Paul Eggert (2006-08-08): 2990# Also see Diario El Heraldo, The country returns to standard time (2006-08-08) 2991# <http://www.elheraldo.hn/nota.php?nid=54941&sec=12>. 2992# It mentions executive decree 18-2006. 2993 2994# From Steffen Thorsen (2006-08-17): 2995# Honduras will observe DST from 2007 to 2009, exact dates are not 2996# published, I have located this authoritative source: 2997# http://www.presidencia.gob.hn/noticia.aspx?nId=47 2998 2999# From Steffen Thorsen (2007-03-30): 3000# http://www.laprensahn.com/pais_nota.php?id04962=7386 3001# So it seems that Honduras will not enter DST this year.... 3002 3003# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3004Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D 3005Rule Hond 1987 1988 - Sep lastSun 0:00 0 S 3006Rule Hond 2006 only - May Sun>=1 0:00 1:00 D 3007Rule Hond 2006 only - Aug Mon>=1 0:00 0 S 3008# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3009Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 3010 -6:00 Hond C%sT 3011# 3012# Great Swan I ceded by US to Honduras in 1972 3013 3014# Jamaica 3015 3016# From Bob Devine (1988-01-28): 3017# Follows US rules. 3018 3019# From U. S. Naval Observatory (1989-01-19): 3020# JAMAICA 5 H BEHIND UTC 3021 3022# From Shanks & Pottenger: 3023# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3024Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 3025 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 3026 -5:00 - EST 1974 Apr 28 2:00 3027 -5:00 US E%sT 1984 3028 -5:00 - EST 3029 3030# Martinique 3031# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3032Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 3033 -4:04:20 - FFMT 1911 May # Fort-de-France MT 3034 -4:00 - AST 1980 Apr 6 3035 -4:00 1:00 ADT 1980 Sep 28 3036 -4:00 - AST 3037 3038# Montserrat 3039# From Paul Eggert (2006-03-22): 3040# In 1995 volcanic eruptions forced evacuation of Plymouth, the capital. 3041# world.gazetteer.com says Cork Hill is the most populous location now. 3042# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3043Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Cork Hill 3044 -4:00 - AST 3045 3046# Nicaragua 3047# 3048# This uses Shanks & Pottenger for times before 2005. 3049# 3050# From Steffen Thorsen (2005-04-12): 3051# I've got reports from 8 different people that Nicaragua just started 3052# DST on Sunday 2005-04-10, in order to save energy because of 3053# expensive petroleum. The exact end date for DST is not yet 3054# announced, only "September" but some sites also say "mid-September". 3055# Some background information is available on the President's official site: 3056# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 3057# The Decree, no 23-2005 is available here: 3058# 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 3059# 3060# From Paul Eggert (2005-05-01): 3061# The decree doesn't say anything about daylight saving, but for now let's 3062# assume that it is daylight saving.... 3063# 3064# From Gwillim Law (2005-04-21): 3065# The Associated Press story on the time change, which can be found at 3066# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 3067# and elsewhere, says (fifth paragraph, translated from Spanish): "The last 3068# time that a change of clocks was applied to save energy was in the year 2000 3069# during the Arnoldo Aleman administration."... 3070# The northamerica file says that Nicaragua has been on UTC-6 continuously 3071# since December 1998. I wasn't able to find any details of Nicaraguan time 3072# changes in 2000. Perhaps a note could be added to the northamerica file, to 3073# the effect that we have indirect evidence that DST was observed in 2000. 3074# 3075# From Jesper Norgaard Welen (2005-11-02): 3076# Nicaragua left DST the 2005-10-02 at 00:00 (local time). 3077# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm 3078# (2005-09-26) 3079# 3080# From Jesper Norgaard Welen (2006-05-05): 3081# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410 3082# (my informal translation) 3083# By order of the president of the republic, Enrique Bolanos, Nicaragua 3084# advanced by sixty minutes their official time, yesterday at 2 in the 3085# morning, and will stay that way until 30.th. of september. 3086# 3087# From Jesper Norgaard Welen (2006-09-30): 3088# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf 3089# My informal translation runs: 3090# The natural sun time is restored in all the national territory, in that the 3091# time is returned one hour at 01:00 am of October 1 of 2006. 3092# 3093# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3094Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 3095Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 3096Rule Nic 2005 only - Apr 10 0:00 1:00 D 3097Rule Nic 2005 only - Oct Sun>=1 0:00 0 S 3098Rule Nic 2006 only - Apr 30 2:00 1:00 D 3099Rule Nic 2006 only - Oct Sun>=1 1:00 0 S 3100# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3101Zone America/Managua -5:45:08 - LMT 1890 3102 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 3103 -6:00 - CST 1973 May 3104 -5:00 - EST 1975 Feb 16 3105 -6:00 Nic C%sT 1992 Jan 1 4:00 3106 -5:00 - EST 1992 Sep 24 3107 -6:00 - CST 1993 3108 -5:00 - EST 1997 3109 -6:00 Nic C%sT 3110 3111# Panama 3112# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3113Zone America/Panama -5:18:08 - LMT 1890 3114 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time 3115 -5:00 - EST 3116 3117# Puerto Rico 3118# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 3119# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3120Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 3121 -4:00 - AST 1942 May 3 3122 -4:00 US A%sT 1946 3123 -4:00 - AST 3124 3125# St Kitts-Nevis 3126# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3127Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 3128 -4:00 - AST 3129 3130# St Lucia 3131# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3132Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 3133 -4:04:00 - CMT 1912 # Castries Mean Time 3134 -4:00 - AST 3135 3136# St Pierre and Miquelon 3137# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 3138# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3139Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 3140 -4:00 - AST 1980 May 3141 -3:00 - PMST 1987 # Pierre & Miquelon Time 3142 -3:00 Canada PM%sT 3143 3144# St Vincent and the Grenadines 3145# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3146Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 3147 -4:04:56 - KMT 1912 # Kingstown Mean Time 3148 -4:00 - AST 3149 3150# Turks and Caicos 3151# 3152# From Chris Dunn in 3153# <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007> 3154# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the 3155# daylight saving dates for time changes have been adjusted to match 3156# the recent U.S. change of dates. 3157# 3158# From Brian Inglis (2007-04-28): 3159# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26] 3160# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three 3161# rows before that there is an out of date entry for Oct: 3162# "Eastern Standard Times Begins 2007 3163# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time" 3164# indicating that the normal ET rules are followed. 3165# 3166# From Paul Eggert (2006-05-01): 3167# Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998) 3168# says they switch at midnight. Go with Shanks & Pottenger. 3169# 3170# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3171Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D 3172Rule TC 1979 2006 - Oct lastSun 2:00 0 S 3173Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D 3174Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D 3175Rule TC 2007 max - Nov Sun>=1 2:00 0 S 3176# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3177Zone America/Grand_Turk -4:44:32 - LMT 1890 3178 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 3179 -5:00 TC E%sT 3180 3181# British Virgin Is 3182# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3183Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 3184 -4:00 - AST 3185 3186# Virgin Is 3187# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3188Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 3189 -4:00 - AST
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