1# This file is in the public domain, so clarified as of 2# 2009-05-17 by Arthur David Olson. 3 4# also includes Central America and the Caribbean 5 6# This file is by no means authoritative; if you think you know better, 7# go ahead and edit the file (and please send any changes to 8# tz@iana.org for general use in the future). For more, please see 9# the file CONTRIBUTING in the tz distribution. 10 11# From Paul Eggert (1999-03-22): 12# A reliable and entertaining source about time zones is 13# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 14 15############################################################################### 16 17# United States 18 19# From Paul Eggert (1999-03-31): 20# Howse writes (pp 121-125) that time zones were invented by 21# Professor Charles Ferdinand Dowd (1825-1904), 22# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 23# His pamphlet "A System of National Time for Railroads" (1870) 24# was the result of his proposals at the Convention of Railroad Trunk Lines 25# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 26# but in 1872-05 he moved the proposed origin to Greenwich. 27# His proposal was adopted by the railroads on 1883-11-18 at 12:00, 28# and the most of the country soon followed suit. 29 30# From Paul Eggert (2005-04-16): 31# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 32# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 33 34# From Paul Eggert (2006-03-22): 35# A good source for time zone historical data in the US is 36# Thomas G. Shanks, The American Atlas (5th edition), 37# San Diego: ACS Publications, Inc. (1991). 38# Make sure you have the errata sheet; the book is somewhat useless without it. 39# It is the source for most of the pre-1991 US entries below. 40 41# From Paul Eggert (2001-03-06): 42# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 43# in his whimsical essay "An Economical Project for Diminishing the Cost 44# of Light" published in the Journal de Paris (1784-04-26). 45# Not everyone is happy with the results: 46# 47# I don't really care how time is reckoned so long as there is some 48# agreement about it, but I object to being told that I am saving 49# daylight when my reason tells me that I am doing nothing of the kind. 50# I even object to the implication that I am wasting something 51# valuable if I stay in bed after the sun has risen. As an admirer 52# of moonlight I resent the bossy insistence of those who want to 53# reduce my time for enjoying it. At the back of the Daylight Saving 54# scheme I detect the bony, blue-fingered hand of Puritanism, eager 55# to push people into bed earlier, and get them up earlier, to make 56# them healthy, wealthy and wise in spite of themselves. 57# 58# -- Robertson Davies, The diary of Samuel Marchbanks, 59# Clarke, Irwin (1947), XIX, Sunday 60# 61# For more about the first ten years of DST in the United States, see 62# Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint 63# (Carnegie Library of Pittsburgh, 1927). 64# http://www.clpgh.org/exhibit/dst.html 65# 66# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 67# However, DST was imposed by the Standard Time Act of 1918, which 68# was the first nationwide legal time standard, and apparently 69# time was just called "Standard Time" or "Daylight Saving Time". 70 71# From Arthur David Olson: 72# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 73# See, for example, the front page of the Saturday, 1974-10-26 74# and Sunday, 1974-10-27 editions of the Washington Post. 75 76# From Arthur David Olson: 77# Before the Uniform Time Act of 1966 took effect in 1967, observance of 78# Daylight Saving Time in the US was by local option, except during wartime. 79 80# From Arthur David Olson (2000-09-25): 81# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 82# In the introduction, Oboler spoke of "Eastern Peace Time." 83# An AltaVista search turned up: 84# http://rowayton.org/rhs/hstaug45.html 85# "When the time is announced over the radio now, it is 'Eastern Peace 86# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 87# (August 1945) by way of confirmation. 88 89# From Joseph Gallant citing 90# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 91# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 92# to switch to London for Attlee's address, but the American people 93# never got to hear his speech live. According to one press account, 94# CBS' Bob Trout was first to announce the word of Japan's surrender, 95# but a few seconds later, NBC, ABC and Mutual also flashed the word 96# of surrender, all of whom interrupting the bells of Big Ben in 97# London which were to precede Mr. Attlee's speech. 98 99# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 100# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 101# 102# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 103# Any announcement from Asia would reach St. John's New York newsroom on a 104# wire service teletype machine, which had prescribed signals for major news. 105# Associated Press, for example, would ring five bells before spewing out 106# typed copy of an important story, and 10 bells for news "of transcendental 107# importance." 108# 109# On Aug. 14, stalling while talking steadily into the NBC networks' open 110# microphone, St. John heard five bells and waited only to hear a sixth bell, 111# before announcing confidently: "Ladies and gentlemen, World War II is over. 112# The Japanese have agreed to our surrender terms." 113# 114# He had scored a 20-second scoop on other broadcasters. 115 116# From Arthur David Olson (2005-08-22): 117# Paul has been careful to use the "US" rules only in those locations 118# that are part of the United States; this reflects the real scope of 119# U.S. government action. So even though the "US" rules have changed 120# in the latest release, other countries won't be affected. 121 122# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 123Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 124Rule US 1918 1919 - Oct lastSun 2:00 0 S 125Rule US 1942 only - Feb 9 2:00 1:00 W # War 126Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 127Rule US 1945 only - Sep lastSun 2:00 0 S 128Rule US 1967 2006 - Oct lastSun 2:00 0 S 129Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 130Rule US 1974 only - Jan 6 2:00 1:00 D 131Rule US 1975 only - Feb 23 2:00 1:00 D 132Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 133Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 134Rule US 2007 max - Mar Sun>=8 2:00 1:00 D 135Rule US 2007 max - Nov Sun>=1 2:00 0 S 136 137# From Arthur David Olson, 2005-12-19 138# We generate the files specified below to guard against old files with 139# obsolete information being left in the time zone binary directory. 140# We limit the list to names that have appeared in previous versions of 141# this time zone package. 142# We do these as separate Zones rather than as Links to avoid problems if 143# a particular place changes whether it observes DST. 144# We put these specifications here in the northamerica file both to 145# increase the chances that they'll actually get compiled and to 146# avoid the need to duplicate the US rules in another file. 147 148# Zone NAME GMTOFF RULES FORMAT [UNTIL] 149Zone EST -5:00 - EST 150Zone MST -7:00 - MST 151Zone HST -10:00 - HST 152Zone EST5EDT -5:00 US E%sT 153Zone CST6CDT -6:00 US C%sT 154Zone MST7MDT -7:00 US M%sT 155Zone PST8PDT -8:00 US P%sT 156 157# From Bob Devine (1988-01-28): 158# ...Alaska (and Hawaii) had the timezone names changed in 1967. 159# old new 160# Pacific Standard Time(PST) -same- 161# Yukon Standard Time(YST) -same- 162# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 163# Nome Standard Time (NT) Bering Standard Time (BST) 164# 165# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 166# The YST zone now covers nearly all of the state, AHST just part 167# of the Aleutian islands. No DST. 168 169# From Paul Eggert (1995-12-19): 170# The tables below use 'NST', not 'NT', for Nome Standard Time. 171# I invented 'CAWT' for Central Alaska War Time. 172 173# From U. S. Naval Observatory (1989-01-19): 174# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 175# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 176# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 177# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 178# USA MOUNTAIN 7 H BEHIND UTC DENVER 179# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 180# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 181# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 182# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 183# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 184# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 185# USA " 9 H BEHIND UTC APR 3 - OCT 30 186# USA HAWAII 10 H BEHIND UTC 187# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 188 189# From Arthur David Olson (1989-01-21): 190# The above dates are for 1988. 191# Note the "AKST" and "AKDT" abbreviations, the claim that there's 192# no DST in Samoa, and the claim that there is DST in Alaska and the 193# Aleutians. 194 195# From Arthur David Olson (1988-02-13): 196# Legal standard time zone names, from United States Code (1982 Edition and 197# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 198# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 199# took effect), as explained in sections 263 and 261: 200# (none) 201# United States standard eastern time 202# United States standard mountain time 203# United States standard central time 204# United States standard Pacific time 205# (none) 206# United States standard Alaska time 207# (none) 208# Next, names from 1967-04-01 until 1983-11-30 (the date for 209# public law 98-181): 210# Atlantic standard time 211# eastern standard time 212# central standard time 213# mountain standard time 214# Pacific standard time 215# Yukon standard time 216# Alaska-Hawaii standard time 217# Bering standard time 218# And after 1983-11-30: 219# Atlantic standard time 220# eastern standard time 221# central standard time 222# mountain standard time 223# Pacific standard time 224# Alaska standard time 225# Hawaii-Aleutian standard time 226# Samoa standard time 227# The law doesn't give abbreviations. 228# 229# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 230# Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time" 231# for time in Guam and the Northern Marianas. See the file "australasia". 232# 233# From Paul Eggert (2015-04-17): 234# HST and HDT are standardized abbreviations for Hawaii-Aleutian 235# standard and daylight times. See section 9.47 (p 234) of the 236# U.S. Government Printing Office Style Manual (2008) 237# http://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf 238 239# From Arthur David Olson, 2005-08-09 240# The following was signed into law on 2005-08-08. 241# 242# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 243# (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15 244# U.S.C. 260a(a)) is amended-- 245# (1) by striking "first Sunday of April" and inserting "second 246# Sunday of March"; and 247# (2) by striking "last Sunday of October" and inserting "first 248# Sunday of November'. 249# (b) Effective Date.--Subsection (a) shall take effect 1 year after the 250# date of enactment of this Act or March 1, 2007, whichever is later. 251# (c) Report to Congress.--Not later than 9 months after the effective 252# date stated in subsection (b), the Secretary shall report to Congress 253# on the impact of this section on energy consumption in the United 254# States. 255# (d) Right to Revert.--Congress retains the right to revert the 256# Daylight Saving Time back to the 2005 time schedules once the 257# Department study is complete. 258 259# US eastern time, represented by New York 260 261# Connecticut, Delaware, District of Columbia, most of Florida, 262# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky 263# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, 264# New Hampshire, New Jersey, New York, North Carolina, Ohio, 265# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 266# Vermont, Virginia, West Virginia 267 268# From Dave Cantor (2004-11-02): 269# Early this summer I had the occasion to visit the Mount Washington 270# Observatory weather station atop (of course!) Mount Washington [, NH].... 271# One of the staff members said that the station was on Eastern Standard Time 272# and didn't change their clocks for Daylight Saving ... so that their 273# reports will always have times which are 5 hours behind UTC. 274 275# From Paul Eggert (2005-08-26): 276# According to today's Huntsville Times 277# http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1 278# a few towns on Alabama's "eastern border with Georgia, such as Phenix City 279# in Russell County, Lanett in Chambers County and some towns in Lee County, 280# set their watches and clocks on Eastern time." It quotes H.H. "Bubba" 281# Roberts, city administrator in Phenix City. as saying "We are in the Central 282# time zone, but we do go by the Eastern time zone because so many people work 283# in Columbus." 284 285# From Paul Eggert (2014-09-06): 286# Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208 287# says that New York City Hall time was 3 minutes 58.4 seconds fast of 288# Eastern time (i.e., -4:56:01.6) just before the 1883 switch. Round to the 289# nearest second. 290 291# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 292Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 293Rule NYC 1920 only - Oct lastSun 2:00 0 S 294Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 295Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 296Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 297# Zone NAME GMTOFF RULES FORMAT [UNTIL] 298Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 299 -5:00 US E%sT 1920 300 -5:00 NYC E%sT 1942 301 -5:00 US E%sT 1946 302 -5:00 NYC E%sT 1967 303 -5:00 US E%sT 304 305# US central time, represented by Chicago 306 307# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 308# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 309# Washington counties), Illinois, western Indiana 310# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 311# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 312# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 313# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 314# western Tennessee, most of Texas, Wisconsin 315 316# From Larry M. Smith (2006-04-26) re Wisconsin: 317# http://www.legis.state.wi.us/statutes/Stat0175.pdf ... 318# is currently enforced at the 01:00 time of change. Because the local 319# "bar time" in the state corresponds to 02:00, a number of citations 320# are issued for the "sale of class 'B' alcohol after prohibited 321# hours" within the deviated hour of this change every year.... 322# 323# From Douglas R. Bomberg (2007-03-12): 324# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI 325# Statue 175 closer in synch with the US Congress' intent.... 326# http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf 327 328# From an email administrator of the City of Fort Pierre, SD (2015-12-21): 329# Fort Pierre is technically located in the Mountain time zone as is 330# the rest of Stanley County. Most of Stanley County and Fort Pierre 331# uses the Central time zone due to doing most of their business in 332# Pierre so it simplifies schedules. I have lived in Stanley County 333# all my life and it has been that way since I can remember. (43 years!) 334# 335# From Paul Eggert (2015-12-25): 336# Assume this practice predates 1970, so Fort Pierre can use America/Chicago. 337 338# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 339Rule Chicago 1920 only - Jun 13 2:00 1:00 D 340Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 341Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 342Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 343Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 344Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 345# Zone NAME GMTOFF RULES FORMAT [UNTIL] 346Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 347 -6:00 US C%sT 1920 348 -6:00 Chicago C%sT 1936 Mar 1 2:00 349 -5:00 - EST 1936 Nov 15 2:00 350 -6:00 Chicago C%sT 1942 351 -6:00 US C%sT 1946 352 -6:00 Chicago C%sT 1967 353 -6:00 US C%sT 354# Oliver County, ND switched from mountain to central time on 1992-10-25. 355Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 356 -7:00 US M%sT 1992 Oct 25 2:00 357 -6:00 US C%sT 358# Morton County, ND, switched from mountain to central time on 359# 2003-10-26, except for the area around Mandan which was already central time. 360# See <http://dmses.dot.gov/docimages/p63/135818.pdf>. 361# Officially this switch also included part of Sioux County, and 362# Jones, Mellette, and Todd Counties in South Dakota; 363# but in practice these other counties were already observing central time. 364# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>. 365Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21 366 -7:00 US M%sT 2003 Oct 26 2:00 367 -6:00 US C%sT 368 369# From Josh Findley (2011-01-21): 370# ...it appears that Mercer County, North Dakota, changed from the 371# mountain time zone to the central time zone at the last transition from 372# daylight-saving to standard time (on Nov. 7, 2010): 373# http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm 374# http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html 375 376# From Andy Lipscomb (2011-01-24): 377# ...according to the Census Bureau, the largest city is Beulah (although 378# it's commonly referred to as Beulah-Hazen, with Hazen being the next 379# largest city in Mercer County). Google Maps places Beulah's city hall 380# at 47 degrees 15' 51" N, 101 degrees 46' 40" W, which yields an offset 381# of 6h47'07". 382 383Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53 384 -7:00 US M%sT 2010 Nov 7 2:00 385 -6:00 US C%sT 386 387# US mountain time, represented by Denver 388# 389# Colorado, far western Kansas, Montana, western 390# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 391# New Mexico, southwestern North Dakota, 392# western South Dakota, far western Texas (El Paso County, Hudspeth County, 393# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 394# 395# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 396Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 397Rule Denver 1920 only - Oct lastSun 2:00 0 S 398Rule Denver 1921 only - May 22 2:00 0 S 399Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 400Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 401# Zone NAME GMTOFF RULES FORMAT [UNTIL] 402Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 403 -7:00 US M%sT 1920 404 -7:00 Denver M%sT 1942 405 -7:00 US M%sT 1946 406 -7:00 Denver M%sT 1967 407 -7:00 US M%sT 408 409# US Pacific time, represented by Los Angeles 410# 411# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 412# Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county 413# north of the Salmon River, and the towns of Burgdorf and Warren), 414# Nevada (except West Wendover), Oregon (except the northern 3/4 of 415# Malheur county), and Washington 416# 417# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 418Rule CA 1948 only - Mar 14 2:00 1:00 D 419Rule CA 1949 only - Jan 1 2:00 0 S 420Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 421Rule CA 1950 1961 - Sep lastSun 2:00 0 S 422Rule CA 1962 1966 - Oct lastSun 2:00 0 S 423# Zone NAME GMTOFF RULES FORMAT [UNTIL] 424Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 425 -8:00 US P%sT 1946 426 -8:00 CA P%sT 1967 427 -8:00 US P%sT 428 429# Alaska 430# AK%sT is the modern abbreviation for -9:00 per USNO. 431# 432# From Paul Eggert (2001-05-30): 433# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 434# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 435# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 436# also a Friday. Include only the time zone part of this transition, 437# ignoring the switch from Julian to Gregorian, since we can't represent 438# the Julian calendar. 439# 440# As far as we know, none of the exact locations mentioned below were 441# permanently inhabited in 1867 by anyone using either calendar. 442# (Yakutat was colonized by the Russians in 1799, but the settlement 443# was destroyed in 1805 by a Yakutat-kon war party.) However, there 444# were nearby inhabitants in some cases and for our purposes perhaps 445# it's best to simply use the official transition. 446 447# From Paul Eggert (2014-07-18): 448# One opinion of the early-1980s turmoil in Alaska over time zones and 449# daylight saving time appeared as graffiti on a Juneau airport wall: 450# "Welcome to Juneau. Please turn your watch back to the 19th century." 451# See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01. 452# http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html 453# 454# Steve Ferguson (2011-01-31) referred to the following source: 455# Norris F. Keeping time in Alaska: national directives, local response. 456# Alaska History 2001;16(1-2). 457# http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/ 458 459# From Arthur David Olson (2011-02-01): 460# Here's database-relevant material from the 2001 "Alaska History" article: 461# 462# On September 20 [1979]...DOT...officials decreed that on April 27, 463# 1980, Juneau and other nearby communities would move to Yukon Time. 464# Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on 465# Pacific Time. 466# 467# ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the 468# Department's September 1979 decision. Juneau and other communities in 469# northern Southeast reverted to Pacific Time on October 26. 470# 471# On October 28 [1983]...the Metlakatla Indian Community Council voted 472# unanimously to keep the reservation on Pacific Time. 473# 474# According to DOT official Joanne Petrie, Indian reservations are not 475# bound to follow time zones imposed by neighboring jurisdictions. 476# 477# (The last is consistent with how the database now handles the Navajo 478# Nation.) 479 480# From Arthur David Olson (2011-02-09): 481# I just spoke by phone with a staff member at the Metlakatla Indian 482# Community office (using contact information available at 483# http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla 484# It's shortly after 1:00 here on the east coast of the United States; 485# the staffer said it was shortly after 10:00 there. When I asked whether 486# that meant they were on Pacific time, they said no - they were on their 487# own time. I asked about daylight saving; they said it wasn't used. I 488# did not inquire about practices in the past. 489 490# From Arthur David Olson (2011-08-17): 491# For lack of better information, assume that Metlakatla's 492# abandonment of use of daylight saving resulted from the 1983 vote. 493 494# From Steffen Thorsen (2015-11-09): 495# It seems Metlakatla did go off PST on Sunday, November 1, changing 496# their time to AKST and are going to follow Alaska's DST, switching 497# between AKST and AKDT from now on.... 498# http://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/ 499 500# Zone NAME GMTOFF RULES FORMAT [UNTIL] 501Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 502 -8:57:41 - LMT 1900 Aug 20 12:00 503 -8:00 - PST 1942 504 -8:00 US P%sT 1946 505 -8:00 - PST 1969 506 -8:00 US P%sT 1980 Apr 27 2:00 507 -9:00 US Y%sT 1980 Oct 26 2:00 508 -8:00 US P%sT 1983 Oct 30 2:00 509 -9:00 US Y%sT 1983 Nov 30 510 -9:00 US AK%sT 511Zone America/Sitka 14:58:47 - LMT 1867 Oct 18 512 -9:01:13 - LMT 1900 Aug 20 12:00 513 -8:00 - PST 1942 514 -8:00 US P%sT 1946 515 -8:00 - PST 1969 516 -8:00 US P%sT 1983 Oct 30 2:00 517 -9:00 US Y%sT 1983 Nov 30 518 -9:00 US AK%sT 519Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18 520 -8:46:18 - LMT 1900 Aug 20 12:00 521 -8:00 - PST 1942 522 -8:00 US P%sT 1946 523 -8:00 - PST 1969 524 -8:00 US P%sT 1983 Oct 30 2:00 525 -8:00 - PST 2015 Nov 1 2:00 526 -9:00 US AK%sT 527Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 528 -9:18:55 - LMT 1900 Aug 20 12:00 529 -9:00 - YST 1942 530 -9:00 US Y%sT 1946 531 -9:00 - YST 1969 532 -9:00 US Y%sT 1983 Nov 30 533 -9:00 US AK%sT 534Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 535 -9:59:36 - LMT 1900 Aug 20 12:00 536 -10:00 - CAT 1942 537 -10:00 US CAT/CAWT 1945 Aug 14 23:00u 538 -10:00 US CAT/CAPT 1946 # Peace 539 -10:00 - CAT 1967 Apr 540 -10:00 - AHST 1969 541 -10:00 US AH%sT 1983 Oct 30 2:00 542 -9:00 US Y%sT 1983 Nov 30 543 -9:00 US AK%sT 544Zone America/Nome 12:58:21 - LMT 1867 Oct 18 545 -11:01:38 - LMT 1900 Aug 20 12:00 546 -11:00 - NST 1942 547 -11:00 US N%sT 1946 548 -11:00 - NST 1967 Apr 549 -11:00 - BST 1969 550 -11:00 US B%sT 1983 Oct 30 2:00 551 -9:00 US Y%sT 1983 Nov 30 552 -9:00 US AK%sT 553Zone America/Adak 12:13:21 - LMT 1867 Oct 18 554 -11:46:38 - LMT 1900 Aug 20 12:00 555 -11:00 - NST 1942 556 -11:00 US N%sT 1946 557 -11:00 - NST 1967 Apr 558 -11:00 - BST 1969 559 -11:00 US B%sT 1983 Oct 30 2:00 560 -10:00 US AH%sT 1983 Nov 30 561 -10:00 US H%sT 562# The following switches don't quite make our 1970 cutoff. 563# 564# Shanks writes that part of southwest Alaska (e.g. Aniak) 565# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 566# and another part (e.g. Akiak) made the same switch five weeks later. 567# 568# From David Flater (2004-11-09): 569# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 570# Historic Preservation Commission, provided this information, which 571# suggests that Unalaska deviated from statutory time from early 1967 572# possibly until 1983: 573# 574# Minutes of the Unalaska City Council Meeting, January 10, 1967: 575# "Except for St. Paul and Akutan, Unalaska is the only important 576# location not on Alaska Standard Time. The following resolution was 577# made by William Robinson and seconded by Henry Swanson: Be it 578# resolved that the City of Unalaska hereby goes to Alaska Standard 579# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 580# January 14, Alaska Standard Time.) This resolution was passed with 581# three votes for and one against." 582 583# Hawaii 584 585# From Arthur David Olson (2010-12-09): 586# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225 587# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09, 588# the article is available at 589# http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf 590# and indicates that standard time was adopted effective noon, January 591# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight 592# saving for the period between the last Sunday of each April and the 593# last Sunday of each September, but less than a month later repealed the 594# act," (page 220), that year-round daylight saving time was in effect 595# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for 596# when clocks changed) and that clocks were changed by 30 minutes 597# effective the second Sunday of June, 1947 (page 219, with no time of 598# day given for when clocks changed). A footnote for the 1933 changes 599# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933) 600# and Act 163 (approved 21 May 1933)." 601 602# From Arthur David Olson (2011-01-19): 603# The following is from "Laws of the Territory of Hawaii Passed by the 604# Seventeenth Legislature: Regular Session 1933," available (as of 605# 2011-01-19) at American University's Pence Law Library. Page 85: "Act 606# 90...At 2 o'clock ante meridian of the last Sunday in April of each 607# year, the standard time of this Territory shall be advanced one 608# hour...This Act shall take effect upon its approval. Approved this 26th 609# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of 610# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is 611# hereby repealed...This Act shall take effect upon its approval, upon 612# which date the standard time of this Territory shall be restored to 613# that existing immediately prior to the taking effect of said Act 90. 614# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor 615# of the Territory of Hawaii." 616# 617# Note that 1933-05-21 was a Sunday. 618# We're left to guess the time of day when Act 163 was approved; guess noon. 619 620# Zone NAME GMTOFF RULES FORMAT [UNTIL] 621Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 622 -10:30 - HST 1933 Apr 30 2:00 623 -10:30 1:00 HDT 1933 May 21 12:00 624 -10:30 - HST 1942 Feb 9 2:00 625 -10:30 1:00 HDT 1945 Sep 30 2:00 626 -10:30 - HST 1947 Jun 8 2:00 627 -10:00 - HST 628Link Pacific/Honolulu Pacific/Johnston 629 630# Now we turn to US areas that have diverged from the consensus since 1970. 631 632# Arizona mostly uses MST. 633 634# From Paul Eggert (2002-10-20): 635# 636# The information in the rest of this paragraph is derived from the 637# Daylight Saving Time web page 638# <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23) 639# maintained by the Arizona State Library, Archives and Public Records. 640# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 641# time, but by federal law railroads, airlines, bus lines, military 642# personnel, and some engaged in interstate commerce continued to 643# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 644# Gazette says that was the date the law changed, and that 04-01 was 645# the date the state's clocks would change. In 1945 the State of 646# Arizona used standard time all year, again with exceptions only as 647# mandated by federal law. Arizona observed DST in 1967, but Arizona 648# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 649# 650# Shanks says the 1944 experiment came to an end on 1944-03-17. 651# Go with the Arizona State Library instead. 652 653# Zone NAME GMTOFF RULES FORMAT [UNTIL] 654Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 655 -7:00 US M%sT 1944 Jan 1 0:01 656 -7:00 - MST 1944 Apr 1 0:01 657 -7:00 US M%sT 1944 Oct 1 0:01 658 -7:00 - MST 1967 659 -7:00 US M%sT 1968 Mar 21 660 -7:00 - MST 661# From Arthur David Olson (1988-02-13): 662# A writer from the Inter Tribal Council of Arizona, Inc., 663# notes in private correspondence dated 1987-12-28 that "Presently, only the 664# Navajo Nation participates in the Daylight Saving Time policy, due to its 665# large size and location in three states." (The "only" means that other 666# tribal nations don't use DST.) 667# 668# From Paul Eggert (2013-08-26): 669# See America/Denver for a zone appropriate for the Navajo Nation. 670 671# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 672# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 673# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 674# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 675# Teton, Twin Falls, Valley, Washington counties, and the southern 676# quarter of Idaho county) and eastern Oregon (most of Malheur County) 677# switched four weeks late in 1974. 678# 679# Zone NAME GMTOFF RULES FORMAT [UNTIL] 680Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 681 -8:00 US P%sT 1923 May 13 2:00 682 -7:00 US M%sT 1974 683 -7:00 - MST 1974 Feb 3 2:00 684 -7:00 US M%sT 685 686# Indiana 687# 688# For a map of Indiana's time zone regions, see: 689# http://en.wikipedia.org/wiki/Time_in_Indiana 690# 691# From Paul Eggert (2007-08-17): 692# Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 693# with the following exceptions: 694# 695# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 696# Vanderburgh, and Warrick counties have been like America/Chicago. 697# 698# - Dearborn and Ohio counties have been like America/New_York. 699# 700# - Clark, Floyd, and Harrison counties have been like 701# America/Kentucky/Louisville. 702# 703# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke, 704# and Switzerland counties have their own time zone histories as noted below. 705# 706# Shanks partitioned Indiana into 345 regions, each with its own time history, 707# and wrote "Even newspaper reports present contradictory information." 708# Those Hoosiers! Such a flighty and changeable people! 709# Fortunately, most of the complexity occurred before our cutoff date of 1970. 710# 711# Other than Indianapolis, the Indiana place names are so nondescript 712# that they would be ambiguous if we left them at the 'America' level. 713# So we reluctantly put them all in a subdirectory 'America/Indiana'. 714 715# From Paul Eggert (2014-06-26): 716# https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana 717# says "DOT is relocating the time zone boundary in Indiana to move Starke, 718# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the 719# Eastern Time Zone to the Central Time Zone.... The effective date of 720# this rule is 2 a.m. EST Sunday, April 2, 2006, which is the 721# changeover date from standard time to Daylight Saving Time." 722# Strictly speaking, this meant the affected counties changed their 723# clocks twice that night, but this obviously was in error. The intent 724# was that 01:59:59 EST be followed by 02:00:00 CDT. 725 726# From Gwillim Law (2007-02-10): 727# The Associated Press has been reporting that Pulaski County, Indiana is 728# going to switch from Central to Eastern Time on March 11, 2007.... 729# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL 730 731# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 732Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 733Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 734Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 735# Zone NAME GMTOFF RULES FORMAT [UNTIL] 736Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 737 -6:00 US C%sT 1920 738 -6:00 Indianapolis C%sT 1942 739 -6:00 US C%sT 1946 740 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 741 -5:00 - EST 1957 Sep 29 2:00 742 -6:00 - CST 1958 Apr 27 2:00 743 -5:00 - EST 1969 744 -5:00 US E%sT 1971 745 -5:00 - EST 2006 746 -5:00 US E%sT 747# 748# Eastern Crawford County, Indiana, left its clocks alone in 1974, 749# as well as from 1976 through 2005. 750# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 751Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 752Rule Marengo 1951 only - Sep lastSun 2:00 0 S 753Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 754Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 755# Zone NAME GMTOFF RULES FORMAT [UNTIL] 756Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 757 -6:00 US C%sT 1951 758 -6:00 Marengo C%sT 1961 Apr 30 2:00 759 -5:00 - EST 1969 760 -5:00 US E%sT 1974 Jan 6 2:00 761 -6:00 1:00 CDT 1974 Oct 27 2:00 762 -5:00 US E%sT 1976 763 -5:00 - EST 2006 764 -5:00 US E%sT 765# 766# Daviess, Dubois, Knox, and Martin Counties, Indiana, 767# switched from eastern to central time in April 2006, then switched back 768# in November 2007. 769# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 770Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D 771Rule Vincennes 1946 only - Sep lastSun 2:00 0 S 772Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D 773Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S 774Rule Vincennes 1955 only - May 1 0:00 1:00 D 775Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D 776Rule Vincennes 1960 only - Oct lastSun 2:00 0 S 777Rule Vincennes 1961 only - Sep lastSun 2:00 0 S 778Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S 779# Zone NAME GMTOFF RULES FORMAT [UNTIL] 780Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53 781 -6:00 US C%sT 1946 782 -6:00 Vincennes C%sT 1964 Apr 26 2:00 783 -5:00 - EST 1969 784 -5:00 US E%sT 1971 785 -5:00 - EST 2006 Apr 2 2:00 786 -6:00 US C%sT 2007 Nov 4 2:00 787 -5:00 US E%sT 788# 789# Perry County, Indiana, switched from eastern to central time in April 2006. 790# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 791Rule Perry 1946 only - Apr lastSun 2:00 1:00 D 792Rule Perry 1946 only - Sep lastSun 2:00 0 S 793Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D 794Rule Perry 1953 1959 - Sep lastSun 2:00 0 S 795Rule Perry 1955 only - May 1 0:00 1:00 D 796Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D 797Rule Perry 1960 only - Oct lastSun 2:00 0 S 798Rule Perry 1961 only - Sep lastSun 2:00 0 S 799Rule Perry 1962 1963 - Oct lastSun 2:00 0 S 800# Zone NAME GMTOFF RULES FORMAT [UNTIL] 801Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57 802 -6:00 US C%sT 1946 803 -6:00 Perry C%sT 1964 Apr 26 2:00 804 -5:00 - EST 1969 805 -5:00 US E%sT 1971 806 -5:00 - EST 2006 Apr 2 2:00 807 -6:00 US C%sT 808# 809# Pike County, Indiana moved from central to eastern time in 1977, 810# then switched back in 2006, then switched back again in 2007. 811# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 812Rule Pike 1955 only - May 1 0:00 1:00 D 813Rule Pike 1955 1960 - Sep lastSun 2:00 0 S 814Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D 815Rule Pike 1961 1964 - Oct lastSun 2:00 0 S 816# Zone NAME GMTOFF RULES FORMAT [UNTIL] 817Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53 818 -6:00 US C%sT 1955 819 -6:00 Pike C%sT 1965 Apr 25 2:00 820 -5:00 - EST 1966 Oct 30 2:00 821 -6:00 US C%sT 1977 Oct 30 2:00 822 -5:00 - EST 2006 Apr 2 2:00 823 -6:00 US C%sT 2007 Nov 4 2:00 824 -5:00 US E%sT 825# 826# Starke County, Indiana moved from central to eastern time in 1991, 827# then switched back in 2006. 828# From Arthur David Olson (1991-10-28): 829# An article on page A3 of the Sunday, 1991-10-27 Washington Post 830# notes that Starke County switched from Central time to Eastern time as of 831# 1991-10-27. 832# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 833Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 834Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 835Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 836Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 837Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 838# Zone NAME GMTOFF RULES FORMAT [UNTIL] 839Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 840 -6:00 US C%sT 1947 841 -6:00 Starke C%sT 1962 Apr 29 2:00 842 -5:00 - EST 1963 Oct 27 2:00 843 -6:00 US C%sT 1991 Oct 27 2:00 844 -5:00 - EST 2006 Apr 2 2:00 845 -6:00 US C%sT 846# 847# Pulaski County, Indiana, switched from eastern to central time in 848# April 2006 and then switched back in March 2007. 849# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 850Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D 851Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S 852Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S 853Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S 854# Zone NAME GMTOFF RULES FORMAT [UNTIL] 855Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35 856 -6:00 US C%sT 1946 857 -6:00 Pulaski C%sT 1961 Apr 30 2:00 858 -5:00 - EST 1969 859 -5:00 US E%sT 1971 860 -5:00 - EST 2006 Apr 2 2:00 861 -6:00 US C%sT 2007 Mar 11 2:00 862 -5:00 US E%sT 863# 864# Switzerland County, Indiana, did not observe DST from 1973 through 2005. 865# Zone NAME GMTOFF RULES FORMAT [UNTIL] 866Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 867 -6:00 US C%sT 1954 Apr 25 2:00 868 -5:00 - EST 1969 869 -5:00 US E%sT 1973 870 -5:00 - EST 2006 871 -5:00 US E%sT 872 873# Part of Kentucky left its clocks alone in 1974. 874# This also includes Clark, Floyd, and Harrison counties in Indiana. 875# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 876Rule Louisville 1921 only - May 1 2:00 1:00 D 877Rule Louisville 1921 only - Sep 1 2:00 0 S 878Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 879Rule Louisville 1941 only - Sep lastSun 2:00 0 S 880Rule Louisville 1946 only - Jun 2 2:00 0 S 881Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 882Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 883# Zone NAME GMTOFF RULES FORMAT [UNTIL] 884Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 885 -6:00 US C%sT 1921 886 -6:00 Louisville C%sT 1942 887 -6:00 US C%sT 1946 888 -6:00 Louisville C%sT 1961 Jul 23 2:00 889 -5:00 - EST 1968 890 -5:00 US E%sT 1974 Jan 6 2:00 891 -6:00 1:00 CDT 1974 Oct 27 2:00 892 -5:00 US E%sT 893# 894# Wayne County, Kentucky 895# 896# From Lake Cumberland LIFE 897# http://www.lake-cumberland.com/life/archive/news990129time.shtml 898# (1999-01-29) via WKYM-101.7: 899# Clinton County has joined Wayne County in asking the DoT to change from 900# the Central to the Eastern time zone.... The Wayne County government made 901# the same request in December. And while Russell County officials have not 902# taken action, the majority of respondents to a poll conducted there in 903# August indicated they would like to change to "fast time" also. 904# The three Lake Cumberland counties are the farthest east of any U.S. 905# location in the Central time zone. 906# 907# From Rich Wales (2000-08-29): 908# After prolonged debate, and despite continuing deep differences of opinion, 909# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 910# (-0500) time. They won't "fall back" this year. See Sara Shipley, 911# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 912# 913# From Paul Eggert (2001-07-16): 914# The final rule was published in the 915# Federal Register 65, 160 (2000-08-17), pp 50154-50158. 916# http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22 917# 918Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 919 -6:00 US C%sT 1946 920 -6:00 - CST 1968 921 -6:00 US C%sT 2000 Oct 29 2:00 922 -5:00 US E%sT 923 924 925# From Rives McDow (2000-08-30): 926# Here ... are all the changes in the US since 1985. 927# Kearny County, KS (put all of county on central; 928# previously split between MST and CST) ... 1990-10 929# Starke County, IN (from CST to EST) ... 1991-10 930# Oliver County, ND (from MST to CST) ... 1992-10 931# West Wendover, NV (from PST TO MST) ... 1999-10 932# Wayne County, KY (from CST to EST) ... 2000-10 933# 934# From Paul Eggert (2001-07-17): 935# We don't know where the line used to be within Kearny County, KS, 936# so omit that change for now. 937# See America/Indiana/Knox for the Starke County, IN change. 938# See America/North_Dakota/Center for the Oliver County, ND change. 939# West Wendover, NV officially switched from Pacific to mountain time on 940# 1999-10-31. See the 941# Federal Register 64, 203 (1999-10-21), pp 56705-56707. 942# http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15 943# However, the Federal Register says that West Wendover already operated 944# on mountain time, and the rule merely made this official; 945# hence a separate tz entry is not needed. 946 947# Michigan 948# 949# From Bob Devine (1988-01-28): 950# Michigan didn't observe DST from 1968 to 1973. 951# 952# From Paul Eggert (1999-03-31): 953# Shanks writes that Michigan started using standard time on 1885-09-18, 954# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 955# that Detroit kept 956# 957# local time until 1900 when the City Council decreed that clocks should 958# be put back twenty-eight minutes to Central Standard Time. Half the 959# city obeyed, half refused. After considerable debate, the decision 960# was rescinded and the city reverted to Sun time. A derisive offer to 961# erect a sundial in front of the city hall was referred to the 962# Committee on Sewers. Then, in 1905, Central time was adopted 963# by city vote. 964# 965# This story is too entertaining to be false, so go with Howse over Shanks. 966# 967# From Paul Eggert (2001-03-06): 968# Garland (1927) writes "Cleveland and Detroit advanced their clocks 969# one hour in 1914." This change is not in Shanks. We have no more 970# info, so omit this for now. 971# 972# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 973# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 974Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 975Rule Detroit 1948 only - Sep lastSun 2:00 0 S 976Rule Detroit 1967 only - Jun 14 2:00 1:00 D 977Rule Detroit 1967 only - Oct lastSun 2:00 0 S 978# Zone NAME GMTOFF RULES FORMAT [UNTIL] 979Zone America/Detroit -5:32:11 - LMT 1905 980 -6:00 - CST 1915 May 15 2:00 981 -5:00 - EST 1942 982 -5:00 US E%sT 1946 983 -5:00 Detroit E%sT 1973 984 -5:00 US E%sT 1975 985 -5:00 - EST 1975 Apr 27 2:00 986 -5:00 US E%sT 987# 988# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan, 989# switched from EST to CST/CDT in 1973. 990# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 991Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 992Rule Menominee 1946 only - Sep lastSun 2:00 0 S 993Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 994Rule Menominee 1966 only - Oct lastSun 2:00 0 S 995# Zone NAME GMTOFF RULES FORMAT [UNTIL] 996Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 997 -6:00 US C%sT 1946 998 -6:00 Menominee C%sT 1969 Apr 27 2:00 999 -5:00 - EST 1973 Apr 29 2:00 1000 -6:00 US C%sT 1001 1002# Navassa 1003# administered by the US Fish and Wildlife Service 1004# claimed by US under the provisions of the 1856 Guano Islands Act 1005# also claimed by Haiti 1006# occupied 1857/1900 by the Navassa Phosphate Co 1007# US lighthouse 1917/1996-09 1008# currently uninhabited 1009# see Mark Fineman, "An Isle Rich in Guano and Discord", 1010# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 1011# Jimmy Skaggs, _The Great Guano Rush_ (1994). 1012 1013################################################################################ 1014 1015 1016# From Paul Eggert (2014-10-31): 1017# 1018# Unless otherwise specified, the source for data through 1990 is: 1019# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 1020# San Diego: ACS Publications, Inc. (2003). 1021# Unfortunately this book contains many errors and cites no sources. 1022# 1023# Gwillim Law writes that a good source 1024# for recent time zone data is the International Air Transport 1025# Association's Standard Schedules Information Manual (IATA SSIM), 1026# published semiannually. Law sent in several helpful summaries 1027# of the IATA's data after 1990. Except where otherwise noted, 1028# IATA SSIM is the source for entries after 1990. 1029# 1030# Other sources occasionally used include: 1031# 1032# Edward W. Whitman, World Time Differences, 1033# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 1034# which I found in the UCLA library. 1035# 1036# William Willett, The Waste of Daylight, 19th edition 1037# <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf> 1038# [PDF] (1914-03) 1039# 1040# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94 1041# <http://www.jstor.org/stable/1774359>. 1042# 1043# See the 'europe' file for Greenland. 1044 1045# Canada 1046 1047# From Alain LaBonté (1994-11-14): 1048# I post here the time zone abbreviations standardized in Canada 1049# for both English and French in the CAN/CSA-Z234.4-89 standard.... 1050# 1051# UTC Standard time Daylight saving time 1052# offset French English French English 1053# -2:30 - - HAT NDT 1054# -3 - - HAA ADT 1055# -3:30 HNT NST - - 1056# -4 HNA AST HAE EDT 1057# -5 HNE EST HAC CDT 1058# -6 HNC CST HAR MDT 1059# -7 HNR MST HAP PDT 1060# -8 HNP PST HAY YDT 1061# -9 HNY YST - - 1062# 1063# HN: Heure Normale ST: Standard Time 1064# HA: Heure Avancée DT: Daylight saving Time 1065# 1066# A: de l'Atlantique Atlantic 1067# C: du Centre Central 1068# E: de l'Est Eastern 1069# M: Mountain 1070# N: Newfoundland 1071# P: du Pacifique Pacific 1072# R: des Rocheuses 1073# T: de Terre-Neuve 1074# Y: du Yukon Yukon 1075# 1076# From Paul Eggert (1994-11-22): 1077# Alas, this sort of thing must be handled by localization software. 1078 1079# Unless otherwise specified, the data entries for Canada are all from Shanks 1080# & Pottenger. 1081 1082# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31, 1083# 2007-03-01): 1084# The British Columbia government announced yesterday that it will 1085# adjust daylight savings next year to align with changes in the 1086# U.S. and the rest of Canada.... 1087# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm 1088# ... 1089# Nova Scotia 1090# Daylight saving time will be extended by four weeks starting in 2007.... 1091# http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf 1092# 1093# [For New Brunswick] the new legislation dictates that the time change is to 1094# be done at 02:00 instead of 00:01. 1095# http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf 1096# ... 1097# Manitoba has traditionally changed the clock every fall at 03:00. 1098# As of 2006, the transition is to take place one hour earlier at 02:00. 1099# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php 1100# ... 1101# [Alberta, Ontario, Quebec] will follow US rules. 1102# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM 1103# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm 1104# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF 1105# ... 1106# P.E.I. will follow US rules.... 1107# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf 1108# ... 1109# Province of Newfoundland and Labrador.... 1110# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm 1111# ... 1112# Yukon 1113# http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf 1114# ... 1115# N.W.T. will follow US rules. Whoever maintains the government web site 1116# does not seem to believe in bookmarks. To see the news release, click the 1117# following link and search for "Daylight Savings Time Change". Press the 1118# "Daylight Savings Time Change" link; it will fire off a popup using 1119# JavaScript. 1120# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive 1121# ... 1122# Nunavut 1123# An amendment to the Interpretation Act was registered on February 19/2007.... 1124# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf 1125 1126# From Paul Eggert (2014-10-18): 1127# H. David Matthews and Mary Vincent's map 1128# "It's about TIME", _Canadian Geographic_ (September-October 1998) 1129# http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp 1130# contains detailed boundaries for regions observing nonstandard 1131# time and daylight saving time arrangements in Canada circa 1998. 1132# 1133# National Research Council Canada maintains info about time zones and DST. 1134# http://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html 1135# http://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5 1136# Its unofficial information is often taken from Matthews and Vincent. 1137 1138# From Paul Eggert (2006-06-27): 1139# For now, assume all of DST-observing Canada will fall into line with the 1140# new US DST rules, 1141 1142# From Chris Walton (2011-12-01) 1143# In the first of Tammy Hardwick's articles 1144# http://www.ilovecreston.com/?p=articles&t=spec&ar=260 1145# she quotes the Friday November 1/1918 edition of the Creston Review. 1146# The quote includes these two statements: 1147# 'Sunday the CPR went back to the old system of time...' 1148# '... The daylight saving scheme was dropped all over Canada at the same time,' 1149# These statements refer to a transition from daylight time to standard time 1150# that occurred nationally on Sunday October 27/1918. This transition was 1151# also documented in the Saturday October 26/1918 edition of the Toronto Star. 1152 1153# In light of that evidence, we alter the date from the earlier believed 1154# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day 1155# than Thursday) in all Canadian rulesets. 1156 1157# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1158Rule Canada 1918 only - Apr 14 2:00 1:00 D 1159Rule Canada 1918 only - Oct 27 2:00 0 S 1160Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 1161Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 1162Rule Canada 1945 only - Sep 30 2:00 0 S 1163Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 1164Rule Canada 1974 2006 - Oct lastSun 2:00 0 S 1165Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D 1166Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D 1167Rule Canada 2007 max - Nov Sun>=1 2:00 0 S 1168 1169 1170# Newfoundland and Labrador 1171 1172# From Paul Eggert (2000-10-02): 1173# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 1174# but the only part of Labrador that follows the rules is the 1175# southeast corner, including Port Hope Simpson and Mary's Harbour, 1176# but excluding, say, Black Tickle. 1177 1178# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1179Rule StJohns 1917 only - Apr 8 2:00 1:00 D 1180Rule StJohns 1917 only - Sep 17 2:00 0 S 1181# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger. 1182Rule StJohns 1919 only - May 5 23:00 1:00 D 1183Rule StJohns 1919 only - Aug 12 23:00 0 S 1184# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger. 1185Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 1186Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 1187# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks & 1188# Pottenger. 1189Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 1190Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 1191# Whitman gives the following transitions: 1192# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 1193# but go with Shanks & Pottenger and assume they used Canadian rules. 1194# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 1195# Apr 30 - Sep 24; go with Shanks & Pottenger. 1196Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 1197Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 1198Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 1199Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 1200Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 1201# From Paul Eggert (2000-10-02): 1202# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 1203# at 00:01 local time. For now, assume it started in 1987. 1204 1205# From Michael Pelley (2011-09-12): 1206# We received today, Monday, September 12, 2011, notification that the 1207# changes to the Newfoundland Standard Time Act have been proclaimed. 1208# The change in the Act stipulates that the change from Daylight Savings 1209# Time to Standard Time and from Standard Time to Daylight Savings Time 1210# now occurs at 2:00AM. 1211# ... 1212# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm 1213# ... 1214# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery 1215# Office of the Chief Information Officer 1216# Executive Council 1217# Government of Newfoundland & Labrador 1218 1219Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 1220Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S 1221Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 1222Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D 1223Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D 1224Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S 1225# 1226# St John's has an apostrophe, but Posix file names can't have apostrophes. 1227# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1228Zone America/St_Johns -3:30:52 - LMT 1884 1229 -3:30:52 StJohns N%sT 1918 1230 -3:30:52 Canada N%sT 1919 1231 -3:30:52 StJohns N%sT 1935 Mar 30 1232 -3:30 StJohns N%sT 1942 May 11 1233 -3:30 Canada N%sT 1946 1234 -3:30 StJohns N%sT 2011 Nov 1235 -3:30 Canada N%sT 1236 1237# most of east Labrador 1238 1239# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'. 1240# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1241Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 1242 -3:30:52 - NST 1918 1243 -3:30:52 Canada N%sT 1919 1244 -3:30:52 - NST 1935 Mar 30 1245 -3:30 - NST 1936 1246 -3:30 StJohns N%sT 1942 May 11 1247 -3:30 Canada N%sT 1946 1248 -3:30 StJohns N%sT 1966 Mar 15 2:00 1249 -4:00 StJohns A%sT 2011 Nov 1250 -4:00 Canada A%sT 1251 1252 1253# west Labrador, Nova Scotia, Prince Edward I 1254 1255# From Brian Inglis (2015-07-20): 1256# From the historical weather station records available at: 1257# https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada 1258# Sydney shares the same time history as Glace Bay, so was 1259# likely to be the same across the island.... 1260# Sydney, as the capital and most populous location, or Cape Breton, would 1261# have been better names for the zone had we known this in 1996. 1262 1263# From Paul Eggert (2015-07-20): 1264# Shanks & Pottenger write that since 1970 most of this region has been like 1265# Halifax. Many locales did not observe peacetime DST until 1972; 1266# the Cape Breton area, represented by Glace Bay, is the largest we know of 1267# (Glace Bay was perhaps not the best name choice but no point changing now). 1268# Shanks & Pottenger also write that Liverpool, NS was the only town 1269# in Canada to observe DST in 1971 but not 1970; for now we'll assume 1270# this is a typo. 1271 1272# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1273Rule Halifax 1916 only - Apr 1 0:00 1:00 D 1274Rule Halifax 1916 only - Oct 1 0:00 0 S 1275Rule Halifax 1920 only - May 9 0:00 1:00 D 1276Rule Halifax 1920 only - Aug 29 0:00 0 S 1277Rule Halifax 1921 only - May 6 0:00 1:00 D 1278Rule Halifax 1921 1922 - Sep 5 0:00 0 S 1279Rule Halifax 1922 only - Apr 30 0:00 1:00 D 1280Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 1281Rule Halifax 1923 only - Sep 4 0:00 0 S 1282Rule Halifax 1924 only - Sep 15 0:00 0 S 1283Rule Halifax 1925 only - Sep 28 0:00 0 S 1284Rule Halifax 1926 only - May 16 0:00 1:00 D 1285Rule Halifax 1926 only - Sep 13 0:00 0 S 1286Rule Halifax 1927 only - May 1 0:00 1:00 D 1287Rule Halifax 1927 only - Sep 26 0:00 0 S 1288Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 1289Rule Halifax 1928 only - Sep 9 0:00 0 S 1290Rule Halifax 1929 only - Sep 3 0:00 0 S 1291Rule Halifax 1930 only - Sep 15 0:00 0 S 1292Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 1293Rule Halifax 1932 only - May 1 0:00 1:00 D 1294Rule Halifax 1933 only - Apr 30 0:00 1:00 D 1295Rule Halifax 1933 only - Oct 2 0:00 0 S 1296Rule Halifax 1934 only - May 20 0:00 1:00 D 1297Rule Halifax 1934 only - Sep 16 0:00 0 S 1298Rule Halifax 1935 only - Jun 2 0:00 1:00 D 1299Rule Halifax 1935 only - Sep 30 0:00 0 S 1300Rule Halifax 1936 only - Jun 1 0:00 1:00 D 1301Rule Halifax 1936 only - Sep 14 0:00 0 S 1302Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 1303Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 1304Rule Halifax 1939 only - May 28 0:00 1:00 D 1305Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 1306Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 1307Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 1308Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 1309Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 1310Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 1311Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 1312Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 1313Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 1314# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1315Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 1316 -4:00 Halifax A%sT 1918 1317 -4:00 Canada A%sT 1919 1318 -4:00 Halifax A%sT 1942 Feb 9 2:00s 1319 -4:00 Canada A%sT 1946 1320 -4:00 Halifax A%sT 1974 1321 -4:00 Canada A%sT 1322Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 1323 -4:00 Canada A%sT 1953 1324 -4:00 Halifax A%sT 1954 1325 -4:00 - AST 1972 1326 -4:00 Halifax A%sT 1974 1327 -4:00 Canada A%sT 1328 1329# New Brunswick 1330 1331# From Paul Eggert (2007-01-31): 1332# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf> 1333# says they changed at 00:01 through 2006, and 1334# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it 1335# clear that this was the case since at least 1993. 1336# For now, assume it started in 1993. 1337 1338# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1339Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D 1340Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S 1341Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D 1342Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S 1343Rule Moncton 1939 only - May 27 1:00 1:00 D 1344Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S 1345Rule Moncton 1940 only - May 19 1:00 1:00 D 1346Rule Moncton 1941 only - May 4 1:00 1:00 D 1347Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D 1348Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S 1349Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S 1350Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D 1351Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S 1352# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1353Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 1354 -5:00 - EST 1902 Jun 15 1355 -4:00 Canada A%sT 1933 1356 -4:00 Moncton A%sT 1942 1357 -4:00 Canada A%sT 1946 1358 -4:00 Moncton A%sT 1973 1359 -4:00 Canada A%sT 1993 1360 -4:00 Moncton A%sT 2007 1361 -4:00 Canada A%sT 1362 1363# Quebec 1364 1365# From Paul Eggert (2015-03-24): 1366# See America/Toronto for most of Quebec, including Montreal. 1367# 1368# Matthews and Vincent (1998) also write that Quebec east of the -63 1369# meridian is supposed to observe AST, but residents as far east as 1370# Natashquan use EST/EDT, and residents east of Natashquan use AST. 1371# The Quebec department of justice writes in 1372# "The situation in Minganie and Basse-Côte-Nord" 1373# http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm 1374# that the coastal strip from just east of Natashquan to Blanc-Sablon 1375# observes Atlantic standard time all year round. 1376# http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en 1377# says this common practice was codified into law as of 2007. 1378# For lack of better info, guess this practice began around 1970, contra to 1379# Shanks & Pottenger who have this region observing AST/ADT. 1380 1381# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1382Zone America/Blanc-Sablon -3:48:28 - LMT 1884 1383 -4:00 Canada A%sT 1970 1384 -4:00 - AST 1385 1386# Ontario 1387 1388# From Paul Eggert (2006-07-09): 1389# Shanks & Pottenger write that since 1970 most of Ontario has been like 1390# Toronto. 1391# Thunder Bay skipped DST in 1973. 1392# Many smaller locales did not observe peacetime DST until 1974; 1393# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1394# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 1395 1396# From Mark Brader (2003-07-26): 1397# [According to the Toronto Star] Orillia, Ontario, adopted DST 1398# effective Saturday, 1912-06-22, 22:00; the article mentions that 1399# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 1400# have already done so. In Orillia DST was to run until Saturday, 1401# 1912-08-31 (no time mentioned), but it was met with considerable 1402# hostility from certain segments of the public, and was revoked after 1403# only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but 1404# presumably that should be -07-06. (1912-06-19, -07-12; also letters 1405# earlier in June). 1406# 1407# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 1408 1409# From Paul Eggert (1997-10-17): 1410# Mark Brader writes that an article in the 1997-10-14 Toronto Star 1411# says that Atikokan, Ontario currently does not observe DST, 1412# but will vote on 11-10 whether to use EST/EDT. 1413# He also writes that the Ontario Time Act (1990, Chapter T.9) 1414# http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html 1415# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 1416# Officially Atikokan is therefore on CST/CDT, and most likely this report 1417# concerns a non-official time observed as a matter of local practice. 1418# 1419# From Paul Eggert (2000-10-02): 1420# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 1421# New Osnaburgh observe CST all year, that Big Trout Lake observes 1422# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 1423# violation of the official Ontario rules. 1424# 1425# From Paul Eggert (2006-07-09): 1426# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the 1427# 2005-07-21 Chronicle-Journal, which said: 1428# 1429# The clocks in Atikokan stay set on standard time year-round. 1430# This means they spend about half the time on central time and 1431# the other half on eastern time. 1432# 1433# For the most part, the system works, Mayor Dennis Brown said. 1434# 1435# "The majority of businesses in Atikokan deal more with Eastern 1436# Canada, but there are some that deal with Western Canada," he 1437# said. "I don't see any changes happening here." 1438# 1439# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang 1440# [New Osnaburgh] follow the same practice." 1441 1442# From Garry McKinnon (2006-07-14) via Chris Walton: 1443# I chatted with a member of my board who has an outstanding memory 1444# and a long history in Atikokan (and in the telecom industry) and he 1445# can say for certain that Atikokan has been practicing the current 1446# time keeping since 1952, at least. 1447 1448# From Paul Eggert (2006-07-17): 1449# Shanks & Pottenger say that Atikokan has agreed with Rainy River 1450# ever since standard time was introduced, but the information from 1451# McKinnon sounds more authoritative. For now, assume that Atikokan 1452# switched to EST immediately after WWII era daylight saving time 1453# ended. This matches the old (less-populous) America/Coral_Harbour 1454# entry since our cutoff date of 1970, so we can move 1455# America/Coral_Harbour to the 'backward' file. 1456 1457# From Mark Brader (2010-03-06): 1458# 1459# Currently the database has: 1460# 1461# # Ontario 1462# 1463# # From Paul Eggert (2006-07-09): 1464# # Shanks & Pottenger write that since 1970 most of Ontario has been like 1465# # Toronto. 1466# # Thunder Bay skipped DST in 1973. 1467# # Many smaller locales did not observe peacetime DST until 1974; 1468# # Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1469# 1470# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom 1471# right corner of page 1, it says that Toronto will return to standard 1472# time at 2 am Sunday morning (which agrees with the database), and that: 1473# 1474# The one-hour setback will go into effect throughout most of Ontario, 1475# except in areas like Windsor which remains on standard time all year. 1476# 1477# Windsor is, of course, a lot larger than Nipigon. 1478# 1479# I only came across this incidentally. I don't know if Windsor began 1480# observing DST when Detroit did, or in 1974, or on some other date. 1481# 1482# By the way, the article continues by noting that: 1483# 1484# Some cities in the United States have pushed the deadline back 1485# three weeks and will change over from daylight saving in October. 1486 1487# From Arthur David Olson (2010-07-17): 1488# 1489# "Standard Time and Time Zones in Canada" appeared in 1490# The Journal of The Royal Astronomical Society of Canada, 1491# volume 26, number 2 (February 1932) and, as of 2010-07-17, 1492# was available at 1493# http://adsabs.harvard.edu/full/1932JRASC..26...49S 1494# 1495# It includes the text below (starting on page 57): 1496# 1497# A list of the places in Canada using daylight saving time would 1498# require yearly revision. From information kindly furnished by 1499# the provincial governments and by the postmasters in many cities 1500# and towns, it is found that the following places used daylight sav- 1501# ing in 1930. The information for the province of Quebec is definite, 1502# for the other provinces only approximate: 1503# 1504# Province Daylight saving time used 1505# Prince Edward Island Not used. 1506# Nova Scotia In Halifax only. 1507# New Brunswick In St. John only. 1508# Quebec In the following places: 1509# Montreal Lachine 1510# Quebec Mont-Royal 1511# Lévis Iberville 1512# St. Lambert Cap de la Madelèine 1513# Verdun Loretteville 1514# Westmount Richmond 1515# Outremont St. Jérôme 1516# Longueuil Greenfield Park 1517# Arvida Waterloo 1518# Chambly-Canton Beaulieu 1519# Melbourne La Tuque 1520# St. Théophile Buckingham 1521# Ontario Used generally in the cities and towns along 1522# the southerly part of the province. Not 1523# used in the northwesterly part. 1524# Manitoba Not used. 1525# Saskatchewan In Regina only. 1526# Alberta Not used. 1527# British Columbia Not used. 1528# 1529# With some exceptions, the use of daylight saving may be said to be limited 1530# to those cities and towns lying between Quebec city and Windsor, Ont. 1531 1532# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1533Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1534Rule Toronto 1919 only - Oct 26 0:00 0 S 1535Rule Toronto 1920 only - May 2 2:00 1:00 D 1536Rule Toronto 1920 only - Sep 26 0:00 0 S 1537Rule Toronto 1921 only - May 15 2:00 1:00 D 1538Rule Toronto 1921 only - Sep 15 2:00 0 S 1539Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1540# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16" 1541# was meant. 1542Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1543Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1544# The 1927-to-1939 rules can be expressed more simply as 1545# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1546# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1547# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1548# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1549# The rules below avoid use of Sun>=25 1550# (which pre-2004 versions of zic cannot handle). 1551Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1552Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1553Rule Toronto 1932 only - May 1 2:00 1:00 D 1554Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1555Rule Toronto 1933 only - Oct 1 2:00 0 S 1556Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1557Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1558Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1559Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1560Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1561Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1562Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1563Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1564Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1565# Shanks & Pottenger say Toronto ended DST a week early in 1971, 1566# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this 1567# is wrong, and that he had confirmed it by checking the 1971-10-30 1568# Toronto Star, which said that DST was ending 1971-10-31 as usual. 1569Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1570 1571# From Paul Eggert (2003-07-27): 1572# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1573# Port Arthur, Ontario, the principle of the Bill has been in 1574# operation for the past three years, and in the City of Moose Jaw, 1575# Saskatchewan, for one year." 1576 1577# From David Bryan via Tory Tronrud, Director/Curator, 1578# Thunder Bay Museum (2003-11-12): 1579# There is some suggestion, however, that, by-law or not, daylight 1580# savings time was being practiced in Fort William and Port Arthur 1581# before 1909.... [I]n 1910, the line between the Eastern and Central 1582# Time Zones was permanently moved about two hundred miles west to 1583# include the Thunder Bay area.... When Canada adopted daylight 1584# savings time in 1916, Fort William and Port Arthur, having done so 1585# already, did not change their clocks.... During the Second World 1586# War,... [t]he cities agreed to implement DST during the summer 1587# months for the remainder of the war years. 1588 1589# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1590Zone America/Toronto -5:17:32 - LMT 1895 1591 -5:00 Canada E%sT 1919 1592 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1593 -5:00 Canada E%sT 1946 1594 -5:00 Toronto E%sT 1974 1595 -5:00 Canada E%sT 1596Zone America/Thunder_Bay -5:57:00 - LMT 1895 1597 -6:00 - CST 1910 1598 -5:00 - EST 1942 1599 -5:00 Canada E%sT 1970 1600 -5:00 Toronto E%sT 1973 1601 -5:00 - EST 1974 1602 -5:00 Canada E%sT 1603Zone America/Nipigon -5:53:04 - LMT 1895 1604 -5:00 Canada E%sT 1940 Sep 29 1605 -5:00 1:00 EDT 1942 Feb 9 2:00s 1606 -5:00 Canada E%sT 1607Zone America/Rainy_River -6:18:16 - LMT 1895 1608 -6:00 Canada C%sT 1940 Sep 29 1609 -6:00 1:00 CDT 1942 Feb 9 2:00s 1610 -6:00 Canada C%sT 1611Zone America/Atikokan -6:06:28 - LMT 1895 1612 -6:00 Canada C%sT 1940 Sep 29 1613 -6:00 1:00 CDT 1942 Feb 9 2:00s 1614 -6:00 Canada C%sT 1945 Sep 30 2:00 1615 -5:00 - EST 1616 1617 1618# Manitoba 1619 1620# From Rob Douglas (2006-04-06): 1621# the old Manitoba Time Act - as amended by Bill 2, assented to 1622# March 27, 1987 ... said ... 1623# "between two o'clock Central Standard Time in the morning of 1624# the first Sunday of April of each year and two o'clock Central 1625# Standard Time in the morning of the last Sunday of October next 1626# following, one hour in advance of Central Standard Time."... 1627# I believe that the English legislation [of the old time act] had 1628# been assented to (March 22, 1967).... 1629# Also, as far as I can tell, there was no order-in-council varying 1630# the time of Daylight Saving Time for 2005 and so the provisions of 1631# the 1987 version would apply - the changeover was at 2:00 Central 1632# Standard Time (i.e. not until 3:00 Central Daylight Time). 1633 1634# From Paul Eggert (2006-04-10): 1635# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s) 1636# starting 1966. Since 02:00s is clearly correct for 1967 on, assume 1637# it was also 02:00s in 1966. 1638 1639# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1640Rule Winn 1916 only - Apr 23 0:00 1:00 D 1641Rule Winn 1916 only - Sep 17 0:00 0 S 1642Rule Winn 1918 only - Apr 14 2:00 1:00 D 1643Rule Winn 1918 only - Oct 27 2:00 0 S 1644Rule Winn 1937 only - May 16 2:00 1:00 D 1645Rule Winn 1937 only - Sep 26 2:00 0 S 1646Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1647Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1648Rule Winn 1945 only - Sep lastSun 2:00 0 S 1649Rule Winn 1946 only - May 12 2:00 1:00 D 1650Rule Winn 1946 only - Oct 13 2:00 0 S 1651Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1652Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1653Rule Winn 1950 only - May 1 2:00 1:00 D 1654Rule Winn 1950 only - Sep 30 2:00 0 S 1655Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1656Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1657Rule Winn 1959 only - Oct lastSun 2:00 0 S 1658Rule Winn 1960 only - Sep lastSun 2:00 0 S 1659Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1660Rule Winn 1963 only - Sep 22 2:00 0 S 1661Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D 1662Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S 1663Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D 1664# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1665Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1666 -6:00 Winn C%sT 2006 1667 -6:00 Canada C%sT 1668 1669 1670# Saskatchewan 1671 1672# From Mark Brader (2003-07-26): 1673# The first actual adoption of DST in Canada was at the municipal 1674# level. As the [Toronto] Star put it (1912-06-07), "While people 1675# elsewhere have long been talking of legislation to save daylight, 1676# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1677# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1678# presumably late evening, as below), and would run until "the end of 1679# the summer". The discrepancy between municipal time and railroad 1680# time was noted. 1681 1682# From Paul Eggert (2003-07-27): 1683# Willett (1914-03) notes that DST "has been in operation ... in the 1684# City of Moose Jaw, Saskatchewan, for one year." 1685 1686# From Paul Eggert (2006-03-22): 1687# Shanks & Pottenger say that since 1970 this region has mostly been as Regina. 1688# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1689# Other western towns (e.g. Lloydminster) are like Edmonton. 1690# Matthews and Vincent (1998) write that Denare Beach and Creighton 1691# are like Winnipeg, in violation of Saskatchewan law. 1692 1693# From W. Jones (1992-11-06): 1694# The. . .below is based on information I got from our law library, the 1695# provincial archives, and the provincial Community Services department. 1696# A precise history would require digging through newspaper archives, and 1697# since you didn't say what you wanted, I didn't bother. 1698# 1699# Saskatchewan is split by a time zone meridian (105W) and over the years 1700# the boundary became pretty ragged as communities near it reevaluated 1701# their affiliations in one direction or the other. In 1965 a provincial 1702# referendum favoured legislating common time practices. 1703# 1704# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1705# Saskatchewan 1978) was proclaimed, and established that the eastern 1706# part of Saskatchewan would use CST year round, that districts in 1707# northwest Saskatchewan would by default follow CST but could opt to 1708# follow Mountain Time rules (thus 1 hour difference in the winter and 1709# zero in the summer), and that districts in southwest Saskatchewan would 1710# by default follow MT but could opt to follow CST. 1711# 1712# It took a few years for the dust to settle (I know one story of a town 1713# on one time zone having its school in another, such that a mom had to 1714# serve her family lunch in two shifts), but presently it seems that only 1715# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1716# rules any more; all other districts appear to have used CST year round 1717# since sometime in the 1960s. 1718 1719# From Chris Walton (2006-06-26): 1720# The Saskatchewan time act which was last updated in 1996 is about 30 pages 1721# long and rather painful to read. 1722# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf 1723 1724# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1725Rule Regina 1918 only - Apr 14 2:00 1:00 D 1726Rule Regina 1918 only - Oct 27 2:00 0 S 1727Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1728Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1729Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1730Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1731Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1732Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1733Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1734Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1735Rule Regina 1945 only - Sep lastSun 2:00 0 S 1736Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1737Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1738Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1739Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1740Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1741Rule Regina 1959 only - Oct lastSun 2:00 0 S 1742# 1743Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1744Rule Swift 1957 only - Oct lastSun 2:00 0 S 1745Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1746Rule Swift 1959 only - Oct lastSun 2:00 0 S 1747Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1748# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1749Zone America/Regina -6:58:36 - LMT 1905 Sep 1750 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1751 -6:00 - CST 1752Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1753 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1754 -7:00 Regina M%sT 1950 1755 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1756 -6:00 - CST 1757 1758 1759# Alberta 1760 1761# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1762Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1763Rule Edm 1918 only - Oct 27 2:00 0 S 1764Rule Edm 1919 only - May 27 2:00 0 S 1765Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1766Rule Edm 1920 only - Oct lastSun 2:00 0 S 1767Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1768Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1769Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1770Rule Edm 1945 only - Sep lastSun 2:00 0 S 1771Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1772Rule Edm 1947 only - Sep lastSun 2:00 0 S 1773Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1774Rule Edm 1967 only - Oct lastSun 2:00 0 S 1775Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1776Rule Edm 1969 only - Oct lastSun 2:00 0 S 1777Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1778Rule Edm 1972 2006 - Oct lastSun 2:00 0 S 1779# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1780Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1781 -7:00 Edm M%sT 1987 1782 -7:00 Canada M%sT 1783 1784 1785# British Columbia 1786 1787# From Paul Eggert (2006-03-22): 1788# Shanks & Pottenger write that since 1970 most of this region has 1789# been like Vancouver. 1790# Dawson Creek uses MST. Much of east BC is like Edmonton. 1791# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1792 1793# It seems though that (re: Creston) is not entirely correct: 1794 1795# From Chris Walton (2011-12-01): 1796# There are two areas within the Canadian province of British Columbia 1797# that do not currently observe daylight saving: 1798# a) The Creston Valley (includes the town of Creston and surrounding area) 1799# b) The eastern half of the Peace River Regional District 1800# (includes the cities of Dawson Creek and Fort St. John) 1801 1802# Earlier this year I stumbled across a detailed article about the time 1803# keeping history of Creston; it was written by Tammy Hardwick who is the 1804# manager of the Creston & District Museum. The article was written in May 2009. 1805# http://www.ilovecreston.com/?p=articles&t=spec&ar=260 1806# According to the article, Creston has not changed its clocks since June 1918. 1807# i.e. Creston has been stuck on UTC-7 for 93 years. 1808# Dawson Creek, on the other hand, changed its clocks as recently as April 1972. 1809 1810# Unfortunately the exact date for the time change in June 1918 remains 1811# unknown and will be difficult to ascertain. I e-mailed Tammy a few months 1812# ago to ask if Sunday June 2 was a reasonable guess. She said it was just 1813# as plausible as any other date (in June). She also said that after writing 1814# the article she had discovered another time change in 1916; this is the 1815# subject of another article which she wrote in October 2010. 1816# http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56 1817 1818# Here is a summary of the three clock change events in Creston's history: 1819# 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7) 1820# Exact date unknown 1821# 2. Oct 1916: switch to Pacific Standard Time (GMT-8) 1822# Exact date in October unknown; Sunday October 1 is a reasonable guess. 1823# 3. June 1918: switch to Pacific Daylight Time (GMT-7) 1824# Exact date in June unknown; Sunday June 2 is a reasonable guess. 1825# note 1: 1826# On Oct 27/1918 when daylight saving ended in the rest of Canada, 1827# Creston did not change its clocks. 1828# note 2: 1829# During WWII when the Federal Government legislated a mandatory clock change, 1830# Creston did not oblige. 1831# note 3: 1832# There is no guarantee that Creston will remain on Mountain Standard Time 1833# (UTC-7) forever. 1834# The subject was debated at least once this year by the town Council. 1835# http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html 1836 1837# During a period WWII, summer time (Daylight saying) was mandatory in Canada. 1838# In Creston, that was handled by shifting the area to PST (-8:00) then applying 1839# summer time to cause the offset to be -7:00, the same as it had been before 1840# the change. It can be argued that the timezone abbreviation during this 1841# period should be PDT rather than MST, but that doesn't seem important enough 1842# (to anyone) to further complicate the rules. 1843 1844# The transition dates (and times) are guesses. 1845 1846# From Matt Johnson (2015-09-21): 1847# Fort Nelson, BC, Canada will cancel DST this year. So while previously they 1848# were aligned with America/Vancouver, they're now aligned with 1849# America/Dawson_Creek. 1850# http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html 1851# 1852# From Tim Parenti (2015-09-23): 1853# This requires a new zone for the Northern Rockies Regional Municipality, 1854# America/Fort_Nelson. The resolution of 2014-12-08 was reached following a 1855# 2014-11-15 poll with nearly 75% support. Effectively, the municipality has 1856# been on MST (-0700) like Dawson Creek since it advanced its clocks on 1857# 2015-03-08. 1858# 1859# From Paul Eggert (2015-09-23): 1860# Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver. 1861 1862# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1863Rule Vanc 1918 only - Apr 14 2:00 1:00 D 1864Rule Vanc 1918 only - Oct 27 2:00 0 S 1865Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 1866Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 1867Rule Vanc 1945 only - Sep 30 2:00 0 S 1868Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 1869Rule Vanc 1946 only - Oct 13 2:00 0 S 1870Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 1871Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S 1872# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1873Zone America/Vancouver -8:12:28 - LMT 1884 1874 -8:00 Vanc P%sT 1987 1875 -8:00 Canada P%sT 1876Zone America/Dawson_Creek -8:00:56 - LMT 1884 1877 -8:00 Canada P%sT 1947 1878 -8:00 Vanc P%sT 1972 Aug 30 2:00 1879 -7:00 - MST 1880Zone America/Fort_Nelson -8:10:47 - LMT 1884 1881 -8:00 Vanc P%sT 1946 1882 -8:00 - PST 1947 1883 -8:00 Vanc P%sT 1987 1884 -8:00 Canada P%sT 2015 Mar 8 2:00 1885 -7:00 - MST 1886Zone America/Creston -7:46:04 - LMT 1884 1887 -7:00 - MST 1916 Oct 1 1888 -8:00 - PST 1918 Jun 2 1889 -7:00 - MST 1890 1891# Northwest Territories, Nunavut, Yukon 1892 1893# From Paul Eggert (2006-03-22): 1894# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 1895# Mathew Englander (1996-10-07) gives the following refs: 1896# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 1897# c. 7 defines Yukon standard time as UTC-9.... 1898# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 1899# [http://canlii.ca/t/7vhg] 1900# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 1901# * O.I.C. 1980/02 established DST. 1902# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 1903 1904# From Brian Inglis (2015-04-14): 1905# 1906# I tried to trace the history of Yukon time and found the following 1907# regulations, giving the reference title and URL if found, regulation name, 1908# and relevant quote if available. Each regulation specifically revokes its 1909# predecessor. The final reference is to the current Interpretation Act 1910# authorizing and resulting from these regulatory changes. 1911# 1912# Only recent regulations were retrievable via Yukon government site search or 1913# index, and only some via Canadian legal sources. Other sources used include 1914# articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS 1915# Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and 1916# 1970 quoted below; each article includes current extracts from provincial 1917# and territorial ST and DST regulations at the end, summaries and details of 1918# standard times and daylight saving time at many locations across Canada, 1919# with time zone maps, tables and calculations for Canadian Sunrise, Sunset, 1920# and LMST; they also cover many countries and global locations, with a chart 1921# and table showing current Universal Time offsets, and may be useful as 1922# another source of information for 1970 and earlier. 1923# 1924# * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26, 1925# pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS) 1926# http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75: 1927# Yukon Interpretation Ordinance 1928# Yukon standard time is the local mean time at the one hundred and 1929# thirty-fifth meridian. 1930# 1931# * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.; 1932# JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System 1933# (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1: 1934# Yukon Interpretation Ordinance, 1955, Chap. 16. 1935# 1936# (1) Subject to this section, standard time shall be reckoned as nine 1937# hours behind Greenwich Time and called Yukon Standard Time. 1938# 1939# (2) Notwithstanding subsection (1), the Commissioner may make regulations 1940# varying the manner of reckoning standard time. 1941# 1942# * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance 1943# http://? - no online source found 1944# 1945# * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC, 1946# Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS) 1947# http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon 1948# Territory Commissioner's Order 1967-59 Interpretation Ordinance ... 1949# 1950# 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon 1951# Territory on 27th January, 1966, is hereby revoked. 1952# 1953# 2. Yukon (East) Standard Time as defined by section 36 of the 1954# Interpretation Ordinance from and after mid-night on the 28th day of May, 1955# 1967 shall be reckoned in the same manner as Pacific Standard Time, that 1956# is to say, eight hours behind Greenwich Time in the area of the Yukon 1957# Territory lying east of the 138th degree longitude west. 1958# 1959# 3. In the remainder of the Territory, lying west of the 138th degree 1960# longitude west, Yukon (West) Standard Time shall be reckoned as nine 1961# hours behind Greenwich Time. 1962# 1963# * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214 1964# http://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html 1965# C.O. 1973/214 INTERPRETATION ACT ... 1966# 1967# 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby 1968# revoked. 1969# 1970# 2. Yukon Standard Time as defined by section 36 of the Interpretation 1971# Act from and after midnight on the twenty-eighth day of October, 1973 1972# shall be reckoned in the same manner as Pacific Standard Time, that is 1973# to say eight hours behind Greenwich Time. 1974# 1975# * O.I.C. 1980/02 INTERPRETATION ACT 1976# http://? - no online source found 1977# 1978# * Yukon Daylight Saving Time, YOIC 1987/56 1979# http://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html 1980# O.I.C. 1987/056 INTERPRETATION ACT ... 1981# 1982# In every year between 1983# (a) two o'clock in the morning in the first Sunday in April, and 1984# (b) two o'clock in the morning in the last Sunday in October, 1985# Standard Time shall be reckoned as seven hours behind Greenwich Time and 1986# called Yukon Daylight Saving Time. 1987# ... 1988# Dated ... 9th day of March, A.D., 1987. 1989# 1990# * Yukon Daylight Saving Time 2006, YOIC 2006/127 1991# http://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html 1992# O.I.C. 2006/127 INTERPRETATION ACT ... 1993# 1994# 1. In Yukon each year the time for general purposes shall be 7 hours 1995# behind Greenwich mean time during the period commencing at two o'clock 1996# in the forenoon on the second Sunday of March and ending at two o'clock 1997# in the forenoon on the first Sunday of November and shall be called 1998# Yukon Daylight Saving Time. 1999# 2000# 2. Order-in-Council 1987/56 is revoked. 2001# 2002# 3. This order comes into force January 1, 2007. 2003# 2004# * Interpretation Act, RSY 2002, c 125 2005# http://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html 2006 2007# From Rives McDow (1999-09-04): 2008# Nunavut ... moved ... to incorporate the whole territory into one time zone. 2009# Nunavut moves to single time zone Oct. 31 2010# http://www.nunatsiaq.com/nunavut/nvt90903_13.html 2011# 2012# From Antoine Leca (1999-09-06): 2013# We then need to create a new timezone for the Kitikmeot region of Nunavut 2014# to differentiate it from the Yellowknife region. 2015 2016# From Paul Eggert (1999-09-20): 2017# Basic Facts: The New Territory 2018# http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html 2019# (1999) reports that Pangnirtung operates on eastern time, 2020# and that Coral Harbour does not observe DST. We don't know when 2021# Pangnirtung switched to eastern time; we'll guess 1995. 2022 2023# From Rives McDow (1999-11-08): 2024# On October 31, when the rest of Nunavut went to Central time, 2025# Pangnirtung wobbled. Here is the result of their wobble: 2026# 2027# The following businesses and organizations in Pangnirtung use Central Time: 2028# 2029# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 2030# Eastern Arctic National Parks, A & D Specialist 2031# 2032# The following businesses and organizations in Pangnirtung use Eastern Time: 2033# 2034# Hamlet office, All other businesses, Both schools, Airport operator 2035# 2036# This has made for an interesting situation there, which warranted the news. 2037# No one there that I spoke with seems concerned, or has plans to 2038# change the local methods of keeping time, as it evidently does not 2039# really interfere with any activities or make things difficult locally. 2040# They plan to celebrate New Year's turn-over twice, one hour apart, 2041# so it appears that the situation will last at least that long. 2042# The Nunavut Intergovernmental Affairs hopes that they will "come to 2043# their senses", but the locals evidently don't see any problem with 2044# the current state of affairs. 2045 2046# From Michaela Rodrigue, writing in the 2047# Nunatsiaq News (1999-11-19): 2048# http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html 2049# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 2050# central - or Nunavut time - for government offices, and eastern time 2051# for municipal offices and schools.... Igloolik [was similar but then] 2052# made the switch to central time on Saturday, Nov. 6. 2053 2054# From Paul Eggert (2000-10-02): 2055# Matthews and Vincent (1998) say the following, but we lack histories 2056# for these potential new Zones. 2057# 2058# The Canadian Forces station at Alert uses Eastern Time while the 2059# handful of residents at the Eureka weather station [in the Central 2060# zone] skip daylight savings. Baffin Island, which is crossed by the 2061# Central, Eastern and Atlantic Time zones only uses Eastern Time. 2062# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 2063# Central Time and Southampton Island [in the Central zone] is not 2064# required to use daylight savings. 2065 2066# From <http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html> 2067# Nunavut now has two time zones (2000-11-10): 2068# The Nunavut government would allow its employees in Kugluktuk and 2069# Cambridge Bay to operate on central time year-round, putting them 2070# one hour behind the rest of Nunavut for six months during the winter. 2071# At the end of October the two communities had rebelled against 2072# Nunavut's unified time zone, refusing to shift to eastern time with 2073# the rest of the territory for the winter. Cambridge Bay remained on 2074# central time, while Kugluktuk, even farther west, reverted to 2075# mountain time, which they had used before the advent of Nunavut's 2076# unified time zone in 1999. 2077# 2078# From Rives McDow (2001-01-20), quoting the Nunavut government: 2079# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 2080 2081# From Paul Eggert (2000-12-04): 2082# Let's just keep track of the official times for now. 2083 2084# From Rives McDow (2001-03-07): 2085# The premier of Nunavut has issued a ministerial statement advising 2086# that effective 2001-04-01, the territory of Nunavut will revert 2087# back to three time zones (mountain, central, and eastern). Of the 2088# cities in Nunavut, Coral Harbor is the only one that I know of that 2089# has said it will not observe dst, staying on EST year round. I'm 2090# checking for more info, and will get back to you if I come up with 2091# more. 2092# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 2093 2094# From Gwillim Law (2005-05-21): 2095# According to ... 2096# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 2097# (from a 1998 Canadian Geographic article), the de facto and de jure time 2098# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 2099# round. Using Google, it's easy to find other websites that confirm this. 2100# I wasn't able to find how far back this time regimen goes, but since it 2101# predates the creation of Nunavut, it probably goes back many years.... 2102# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 2103# 2104# From Paul Eggert (2014-10-17): 2105# For lack of better information, assume that Southampton Island observed 2106# daylight saving only during wartime. Gwillim Law's email also 2107# mentioned maps now maintained by National Research Council Canada; 2108# see above for an up-to-date link. 2109 2110# From Chris Walton (2007-03-01): 2111# ... the community of Resolute (located on Cornwallis Island in 2112# Nunavut) moved from Central Time to Eastern Time last November. 2113# Basically the community did not change its clocks at the end of 2114# daylight saving.... 2115# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html 2116 2117# From Chris Walton (2011-03-21): 2118# Back in 2007 I initiated the creation of a new "zone file" for Resolute 2119# Bay. Resolute Bay is a small community located about 900km north of 2120# the Arctic Circle. The zone file was required because Resolute Bay had 2121# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007. 2122# 2123# According to new information which I received last week, Resolute Bay 2124# went back to using UTC-6 in the winter of 2007-2008... 2125# 2126# On March 11/2007 most of Canada went onto daylight saving. On March 2127# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I 2128# talked to somebody that was both knowledgeable and helpful. I was able 2129# to confirm that Resolute Bay was still operating on UTC-5. It was 2130# explained to me that Resolute Bay had been on the Eastern Time zone 2131# (EST) in the winter, and was now back on the Central Time zone (CDT). 2132# i.e. the time zone had changed twice in the last year but the clocks 2133# had not moved. The residents had to know which time zone they were in 2134# so they could follow the correct TV schedule... 2135# 2136# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I 2137# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature 2138# of the phone call, I decided to seek out an alternate source of 2139# information. I found an e-mail address for somebody by the name of 2140# Stephanie Adams whose job was listed as "Inns North Support Officer for 2141# Arctic Co-operatives." I was under the impression that Stephanie lived 2142# and worked in Resolute Bay... 2143# 2144# On March 14/2011 I phoned the hamlet office again. I was told that 2145# Resolute Bay had been using Central Standard Time over the winter of 2146# 2010-2011 and that the clocks had therefore been moved one hour ahead 2147# on March 13/2011. The person I talked to was aware that Resolute Bay 2148# had previously experimented with Eastern Standard Time but he could not 2149# tell me when the practice had stopped. 2150# 2151# On March 17/2011 I searched the Web to find an e-mail address of 2152# somebody that might be able to tell me exactly when Resolute Bay went 2153# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz 2154# used to be the mayor of Resolute Bay and he apparently owns half the 2155# businesses including "South Camp Inn." This website has some info on 2156# Aziz: 2157# http://www.uphere.ca/node/493 2158# 2159# I sent Aziz an e-mail asking when Resolute Bay had stopped using 2160# Eastern Standard Time. 2161# 2162# Aziz responded quickly with this: "hi, The time was not changed for the 2163# 1 year only, the following year, the community went back to the old way 2164# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in 2165# the winter Zulu plus 6 hrs" 2166# 2167# This of course conflicted with everything I had ascertained in November 2008. 2168# 2169# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz 2170# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You 2171# may want to check with the weather office in Resolute Bay or do a 2172# search on the weather through Env. Canada. web site" 2173# 2174# If I had realized the Stephanie did not live in Resolute Bay I would 2175# never have contacted her. I now believe that all the information I 2176# obtained in November 2008 should be ignored... 2177# I apologize for reporting incorrect information in 2008. 2178 2179# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2180Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 2181Rule NT_YK 1918 only - Oct 27 2:00 0 S 2182Rule NT_YK 1919 only - May 25 2:00 1:00 D 2183Rule NT_YK 1919 only - Nov 1 0:00 0 S 2184Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 2185Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 2186Rule NT_YK 1945 only - Sep 30 2:00 0 S 2187Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 2188Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 2189Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 2190Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S 2191Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D 2192# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2193# aka Panniqtuuq 2194Zone America/Pangnirtung 0 - -00 1921 # trading post est. 2195 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 2196 -5:00 Canada E%sT 1999 Oct 31 2:00 2197 -6:00 Canada C%sT 2000 Oct 29 2:00 2198 -5:00 Canada E%sT 2199# formerly Frobisher Bay 2200Zone America/Iqaluit 0 - -00 1942 Aug # Frobisher Bay est. 2201 -5:00 NT_YK E%sT 1999 Oct 31 2:00 2202 -6:00 Canada C%sT 2000 Oct 29 2:00 2203 -5:00 Canada E%sT 2204# aka Qausuittuq 2205Zone America/Resolute 0 - -00 1947 Aug 31 # Resolute founded 2206 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2207 -5:00 - EST 2001 Apr 1 3:00 2208 -6:00 Canada C%sT 2006 Oct 29 2:00 2209 -5:00 - EST 2007 Mar 11 3:00 2210 -6:00 Canada C%sT 2211# aka Kangiqiniq 2212Zone America/Rankin_Inlet 0 - -00 1957 # Rankin Inlet founded 2213 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2214 -5:00 - EST 2001 Apr 1 3:00 2215 -6:00 Canada C%sT 2216# aka Iqaluktuuttiaq 2217Zone America/Cambridge_Bay 0 - -00 1920 # trading post est.? 2218 -7:00 NT_YK M%sT 1999 Oct 31 2:00 2219 -6:00 Canada C%sT 2000 Oct 29 2:00 2220 -5:00 - EST 2000 Nov 5 0:00 2221 -6:00 - CST 2001 Apr 1 3:00 2222 -7:00 Canada M%sT 2223Zone America/Yellowknife 0 - -00 1935 # Yellowknife founded? 2224 -7:00 NT_YK M%sT 1980 2225 -7:00 Canada M%sT 2226Zone America/Inuvik 0 - -00 1953 # Inuvik founded 2227 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 2228 -7:00 NT_YK M%sT 1980 2229 -7:00 Canada M%sT 2230Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 2231 -9:00 NT_YK Y%sT 1967 May 28 0:00 2232 -8:00 NT_YK P%sT 1980 2233 -8:00 Canada P%sT 2234Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 2235 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 2236 -8:00 NT_YK P%sT 1980 2237 -8:00 Canada P%sT 2238 2239 2240############################################################################### 2241 2242# Mexico 2243 2244# From Paul Eggert (2014-12-07): 2245# The Investigation and Analysis Service of the 2246# Mexican Library of Congress (MLoC) has published a 2247# history of Mexican local time (in Spanish) 2248# http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm 2249# 2250# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC. 2251# (In all cases we go with the MLoC.) 2252# S&P report that Baja was at -8:00 in 1922/1923. 2253# S&P say the 1930 transition in Baja was 1930-11-16. 2254# S&P report no DST during summer 1931. 2255# S&P report a transition at 1932-03-30 23:00, not 1932-04-01. 2256 2257# From Gwillim Law (2001-02-20): 2258# There are some other discrepancies between the Decrees page and the 2259# tz database. I think they can best be explained by supposing that 2260# the researchers who prepared the Decrees page failed to find some of 2261# the relevant documents. 2262 2263# From Alan Perry (1996-02-15): 2264# A guy from our Mexico subsidiary finally found the Presidential Decree 2265# outlining the timezone changes in Mexico. 2266# 2267# ------------- Begin Forwarded Message ------------- 2268# 2269# I finally got my hands on the Official Presidential Decree that sets up the 2270# rules for the DST changes. The rules are: 2271# 2272# 1. The country is divided in 3 timezones: 2273# - Baja California Norte (the Mexico/BajaNorte TZ) 2274# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 2275# - The rest of the country (the Mexico/General TZ) 2276# 2277# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 2278# at 2:00 AM, the times in each zone are as follows: 2279# BajaNorte: GMT+7 2280# BajaSur: GMT+6 2281# General: GMT+5 2282# 2283# 3. The rest of the year, the times are as follows: 2284# BajaNorte: GMT+8 2285# BajaSur: GMT+7 2286# General: GMT+6 2287# 2288# The Decree was published in Mexico's Official Newspaper on January 4th. 2289# 2290# -------------- End Forwarded Message -------------- 2291# From Paul Eggert (1996-06-12): 2292# For an English translation of the decree, see 2293# "Diario Oficial: Time Zone Changeover" (1996-01-04). 2294# http://mexico-travel.com/extra/timezone_eng.html 2295 2296# From Rives McDow (1998-10-08): 2297# The State of Quintana Roo has reverted back to central STD and DST times 2298# (i.e. UTC -0600 and -0500 as of 1998-08-02). 2299 2300# From Rives McDow (2000-01-10): 2301# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 2302# zone 5 hours from the International Date Line, and will not observe daylight 2303# savings time so as to stay on the same time zone as the southern part of 2304# Arizona year round. 2305 2306# From Jesper Nørgaard, translating 2307# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 2308# In Oaxaca, the 55.000 teachers from the Section 22 of the National 2309# Syndicate of Education Workers, refuse to apply daylight saving each 2310# year, so that the more than 10,000 schools work at normal hour the 2311# whole year. 2312 2313# From Gwillim Law (2001-01-19): 2314# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 2315# (translated):... 2316# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 2317# that Summer Time will be reduced from seven to five months, starting 2318# this year.... 2319# http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001 2320# [translated], says "summer time will ... take effect on the first Sunday 2321# in May, and end on the last Sunday of September. 2322 2323# From Arthur David Olson (2001-01-25): 2324# The 2001-01-24 traditional Washington Post contained the page one 2325# story "Timely Issue Divides Mexicans."... 2326# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 2327# ... Mexico City Mayor López Obrador "...is threatening to keep 2328# Mexico City and its 20 million residents on a different time than 2329# the rest of the country..." In particular, López Obrador would abolish 2330# observation of Daylight Saving Time. 2331 2332# Official statute published by the Energy Department 2333# http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre 2334# (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 2335# and Sonora with no DST. This was reported by Jesper Nørgaard (2001-02-03). 2336 2337# From Paul Eggert (2001-03-03): 2338# 2339# http://www.latimes.com/news/nation/20010303/t000018766.html 2340# James F. Smith writes in today's LA Times 2341# * Sonora will continue to observe standard time. 2342# * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that 2343# the Federal District will not adopt DST. 2344# * 4 of 16 district leaders announced they'll ignore the decree. 2345# * The decree does not affect federal-controlled facilities including 2346# the airport, banks, hospitals, and schools. 2347# 2348# For now we'll assume that the Federal District will bow to federal rules. 2349 2350# From Jesper Nørgaard (2001-04-01): 2351# I found some references to the Mexican application of daylight 2352# saving, which modifies what I had already sent you, stating earlier 2353# that a number of northern Mexican states would go on daylight 2354# saving. The modification reverts this to only cover Baja California 2355# (Norte), while all other states (except Sonora, who has no daylight 2356# saving all year) will follow the original decree of president 2357# Vicente Fox, starting daylight saving May 6, 2001 and ending 2358# September 30, 2001. 2359# References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp> 2360# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 2361 2362# From Reuters (2001-09-04): 2363# Mexico's Supreme Court on Tuesday declared that daylight savings was 2364# unconstitutional in Mexico City, creating the possibility the 2365# capital will be in a different time zone from the rest of the nation 2366# next year.... The Supreme Court's ruling takes effect at 2:00 2367# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 2368# standard time. "This is so residents of the Federal District are not 2369# subject to unexpected time changes," a statement from the court said. 2370 2371# From Jesper Nørgaard Welen (2002-03-12): 2372# ... consulting my local grocery store(!) and my coworkers, they all insisted 2373# that a new decision had been made to reinstate US style DST in Mexico.... 2374# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 2375# confirms this. Sonora as usual is the only state where DST is not applied. 2376 2377# From Steffen Thorsen (2009-12-28): 2378# 2379# Steffen Thorsen wrote: 2380# > Mexico's House of Representatives has approved a proposal for northern 2381# > Mexico's border cities to share the same daylight saving schedule as 2382# > the United States. 2383# Now this has passed both the Congress and the Senate, so starting from 2384# 2010, some border regions will be the same: 2385# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/ 2386# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939 2387# (Spanish) 2388# 2389# Could not find the new law text, but the proposed law text changes are here: 2390# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf 2391# (Gaceta Parlamentaria) 2392# 2393# There is also a list of the votes here: 2394# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html 2395# 2396# Our page: 2397# http://www.timeanddate.com/news/time/north-mexico-dst-change.html 2398 2399# From Arthur David Olson (2010-01-20): 2400# The page 2401# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2402# includes this text: 2403# En los municipios fronterizos de Tijuana y Mexicali en Baja California; 2404# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila; 2405# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en 2406# Tamaulipas, la aplicación de este horario estacional surtirá efecto 2407# desde las dos horas del segundo domingo de marzo y concluirá a las dos 2408# horas del primer domingo de noviembre. 2409# En los municipios fronterizos que se encuentren ubicados en la franja 2410# fronteriza norte en el territorio comprendido entre la línea 2411# internacional y la línea paralela ubicada a una distancia de veinte 2412# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el 2413# interior del país, la aplicación de este horario estacional surtirá 2414# efecto desde las dos horas del segundo domingo de marzo y concluirá a 2415# las dos horas del primer domingo de noviembre. 2416 2417# From Steffen Thorsen (2014-12-08), translated by Gwillim Law: 2418# The Mexican state of Quintana Roo will likely change to EST in 2015. 2419# 2420# http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo 2421# "With this change, the time conflict that has existed between the municipios 2422# of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an 2423# end. The latter declared itself in rebellion 15 years ago when a time change 2424# was initiated in Mexico, and since then it has refused to change its time 2425# zone along with the rest of the country." 2426# 2427# From Steffen Thorsen (2015-01-14), translated by Gwillim Law: 2428# http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html 2429# "...the new time zone will come into effect at two o'clock on the first Sunday 2430# of February, when we will have to advance the clock one hour from its current 2431# time..." 2432# Also, the new zone will not use DST. 2433# 2434# From Carlos Raúl Perasso (2015-02-02): 2435# The decree that modifies the Mexican Hour System Law has finally 2436# been published at the Diario Oficial de la Federación 2437# http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015 2438# It establishes 5 zones for Mexico: 2439# 1- Zona Centro (Central Zone): Corresponds to longitude 90 W, 2440# includes most of Mexico, excluding what's mentioned below. 2441# 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the 2442# states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía 2443# de Banderas which lies in Central Zone); Sinaloa and Sonora. 2444# 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the 2445# state of Baja California. 2446# 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state 2447# of Quintana Roo. 2448# 5- The islands, reefs and keys shall take their timezone from the 2449# longitude they are located at. 2450 2451# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2452Rule Mexico 1939 only - Feb 5 0:00 1:00 D 2453Rule Mexico 1939 only - Jun 25 0:00 0 S 2454Rule Mexico 1940 only - Dec 9 0:00 1:00 D 2455Rule Mexico 1941 only - Apr 1 0:00 0 S 2456Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 2457Rule Mexico 1944 only - May 1 0:00 0 S 2458Rule Mexico 1950 only - Feb 12 0:00 1:00 D 2459Rule Mexico 1950 only - Jul 30 0:00 0 S 2460Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 2461Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 2462Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 2463Rule Mexico 2001 only - Sep lastSun 2:00 0 S 2464Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 2465Rule Mexico 2002 max - Oct lastSun 2:00 0 S 2466# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2467# Quintana Roo; represented by Cancún 2468Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 2469 -6:00 - CST 1981 Dec 23 2470 -5:00 Mexico E%sT 1998 Aug 2 2:00 2471 -6:00 Mexico C%sT 2015 Feb 1 2:00 2472 -5:00 - EST 2473# Campeche, Yucatán; represented by Mérida 2474Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 2475 -6:00 - CST 1981 Dec 23 2476 -5:00 - EST 1982 Dec 2 2477 -6:00 Mexico C%sT 2478# Coahuila, Nuevo León, Tamaulipas (near US border) 2479# This includes the following municipalities: 2480# in Coahuila: Ocampo, Acuña, Zaragoza, Jiménez, Piedras Negras, Nava, 2481# Guerrero, Hidalgo. 2482# in Nuevo León: Anáhuac, Los Aldama. 2483# in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo, 2484# Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso, Matamoros. 2485# See: Inicia mañana Horario de Verano en zona fronteriza, El Universal, 2486# 2016-03-12 2487# http://www.eluniversal.com.mx/articulo/estados/2016/03/12/inicia-manana-horario-de-verano-en-zona-fronteriza 2488Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00 2489 -6:00 - CST 1988 2490 -6:00 US C%sT 1989 2491 -6:00 Mexico C%sT 2010 2492 -6:00 US C%sT 2493# Durango; Coahuila, Nuevo León, Tamaulipas (away from US border) 2494Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 2495 -6:00 - CST 1988 2496 -6:00 US C%sT 1989 2497 -6:00 Mexico C%sT 2498# Central Mexico 2499Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 2500 -7:00 - MST 1927 Jun 10 23:00 2501 -6:00 - CST 1930 Nov 15 2502 -7:00 - MST 1931 May 1 23:00 2503 -6:00 - CST 1931 Oct 2504 -7:00 - MST 1932 Apr 1 2505 -6:00 Mexico C%sT 2001 Sep 30 2:00 2506 -6:00 - CST 2002 Feb 20 2507 -6:00 Mexico C%sT 2508# Chihuahua (near US border) 2509# This includes the municipalities of Janos, Ascensión, Juárez, Guadalupe, 2510# Práxedis G Guerrero, Coyame del Sotol, Ojinaga, and Manuel Benavides. 2511# (See the 2016-03-12 El Universal source mentioned above.) 2512Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20 2513 -7:00 - MST 1927 Jun 10 23:00 2514 -6:00 - CST 1930 Nov 15 2515 -7:00 - MST 1931 May 1 23:00 2516 -6:00 - CST 1931 Oct 2517 -7:00 - MST 1932 Apr 1 2518 -6:00 - CST 1996 2519 -6:00 Mexico C%sT 1998 2520 -6:00 - CST 1998 Apr Sun>=1 3:00 2521 -7:00 Mexico M%sT 2010 2522 -7:00 US M%sT 2523# Chihuahua (away from US border) 2524Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 2525 -7:00 - MST 1927 Jun 10 23:00 2526 -6:00 - CST 1930 Nov 15 2527 -7:00 - MST 1931 May 1 23:00 2528 -6:00 - CST 1931 Oct 2529 -7:00 - MST 1932 Apr 1 2530 -6:00 - CST 1996 2531 -6:00 Mexico C%sT 1998 2532 -6:00 - CST 1998 Apr Sun>=1 3:00 2533 -7:00 Mexico M%sT 2534# Sonora 2535Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 2536 -7:00 - MST 1927 Jun 10 23:00 2537 -6:00 - CST 1930 Nov 15 2538 -7:00 - MST 1931 May 1 23:00 2539 -6:00 - CST 1931 Oct 2540 -7:00 - MST 1932 Apr 1 2541 -6:00 - CST 1942 Apr 24 2542 -7:00 - MST 1949 Jan 14 2543 -8:00 - PST 1970 2544 -7:00 Mexico M%sT 1999 2545 -7:00 - MST 2546 2547# From Alexander Krivenyshev (2010-04-21): 2548# According to news, Bahía de Banderas (Mexican state of Nayarit) 2549# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to 2550# share the same time zone as nearby city Puerto Vallarta, Jalisco). 2551# 2552# (Spanish) 2553# Bahía de Banderas homologa su horario al del centro del 2554# país, a partir de este domingo 2555# http://www.nayarit.gob.mx/notes.asp?id=20748 2556# 2557# Bahía de Banderas homologa su horario con el del Centro del 2558# País 2559# 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 2560# 2561# (English) 2562# Puerto Vallarta and Bahía de Banderas: One Time Zone 2563# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml 2564# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html 2565# 2566# "Mexico's Senate approved the amendments to the Mexican Schedule System that 2567# will allow Bahía de Banderas and Puerto Vallarta to share the same time 2568# zone ..." 2569# Baja California Sur, Nayarit, Sinaloa 2570 2571# From Arthur David Olson (2010-05-01): 2572# Use "Bahia_Banderas" to keep the name to fourteen characters. 2573 2574# Mazatlán 2575Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 2576 -7:00 - MST 1927 Jun 10 23:00 2577 -6:00 - CST 1930 Nov 15 2578 -7:00 - MST 1931 May 1 23:00 2579 -6:00 - CST 1931 Oct 2580 -7:00 - MST 1932 Apr 1 2581 -6:00 - CST 1942 Apr 24 2582 -7:00 - MST 1949 Jan 14 2583 -8:00 - PST 1970 2584 -7:00 Mexico M%sT 2585 2586# Bahía de Banderas 2587Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00 2588 -7:00 - MST 1927 Jun 10 23:00 2589 -6:00 - CST 1930 Nov 15 2590 -7:00 - MST 1931 May 1 23:00 2591 -6:00 - CST 1931 Oct 2592 -7:00 - MST 1932 Apr 1 2593 -6:00 - CST 1942 Apr 24 2594 -7:00 - MST 1949 Jan 14 2595 -8:00 - PST 1970 2596 -7:00 Mexico M%sT 2010 Apr 4 2:00 2597 -6:00 Mexico C%sT 2598 2599# Baja California 2600Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 2601 -7:00 - MST 1924 2602 -8:00 - PST 1927 Jun 10 23:00 2603 -7:00 - MST 1930 Nov 15 2604 -8:00 - PST 1931 Apr 1 2605 -8:00 1:00 PDT 1931 Sep 30 2606 -8:00 - PST 1942 Apr 24 2607 -8:00 1:00 PWT 1945 Aug 14 23:00u 2608 -8:00 1:00 PPT 1945 Nov 12 # Peace 2609 -8:00 - PST 1948 Apr 5 2610 -8:00 1:00 PDT 1949 Jan 14 2611 -8:00 - PST 1954 2612 -8:00 CA P%sT 1961 2613 -8:00 - PST 1976 2614 -8:00 US P%sT 1996 2615 -8:00 Mexico P%sT 2001 2616 -8:00 US P%sT 2002 Feb 20 2617 -8:00 Mexico P%sT 2010 2618 -8:00 US P%sT 2619# From Paul Eggert (2006-03-22): 2620# Formerly there was an America/Ensenada zone, which differed from 2621# America/Tijuana only in that it did not observe DST from 1976 2622# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say 2623# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports 2624# that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and 2625# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that 2626# DST-observance was a town-by-town matter back then. This concerns 2627# data after 1970 so most likely there should be at least one Zone 2628# other than America/Tijuana for Baja, but it's not clear yet what its 2629# name or contents should be. 2630# 2631# From Paul Eggert (2015-10-08): 2632# Formerly there was an America/Santa_Isabel zone, but this appears to 2633# have come from a misreading of 2634# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2635# It has been moved to the 'backward' file. 2636# 2637# 2638# Revillagigedo Is 2639# no information 2640 2641############################################################################### 2642 2643# Anguilla 2644# Antigua and Barbuda 2645# See America/Port_of_Spain. 2646 2647# Bahamas 2648# 2649# For 1899 Milne gives -5:09:29.5; round that. 2650# 2651# From Sue Williams (2006-12-07): 2652# The Bahamas announced about a month ago that they plan to change their DST 2653# rules to sync with the U.S. starting in 2007.... 2654# http://www.jonesbahamas.com/?c=45&a=10412 2655 2656# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2657Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S 2658Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D 2659# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2660Zone America/Nassau -5:09:30 - LMT 1912 Mar 2 2661 -5:00 Bahamas E%sT 1976 2662 -5:00 US E%sT 2663 2664# Barbados 2665 2666# For 1899 Milne gives -3:58:29.2; round that. 2667 2668# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2669Rule Barb 1977 only - Jun 12 2:00 1:00 D 2670Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 2671Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 2672Rule Barb 1979 only - Sep 30 2:00 0 S 2673Rule Barb 1980 only - Sep 25 2:00 0 S 2674# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2675Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown 2676 -3:58:29 - BMT 1932 # Bridgetown Mean Time 2677 -4:00 Barb A%sT 2678 2679# Belize 2680# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger. 2681# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2682Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 2683Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 2684Rule Belize 1973 only - Dec 5 0:00 1:00 D 2685Rule Belize 1974 only - Feb 9 0:00 0 S 2686Rule Belize 1982 only - Dec 18 0:00 1:00 D 2687Rule Belize 1983 only - Feb 12 0:00 0 S 2688# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2689Zone America/Belize -5:52:48 - LMT 1912 Apr 2690 -6:00 Belize C%sT 2691 2692# Bermuda 2693 2694# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower, 2695# Bermuda dockyard, Ireland I; round that. 2696 2697# From Dan Jones, reporting in The Royal Gazette (2006-06-26): 2698 2699# Next year, however, clocks in the US will go forward on the second Sunday 2700# in March, until the first Sunday in November. And, after the Time Zone 2701# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on 2702# Friday, the same thing will happen in Bermuda. 2703# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135 2704 2705# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2706Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton 2707 -4:00 - AST 1974 Apr 28 2:00 2708 -4:00 Canada A%sT 1976 2709 -4:00 US A%sT 2710 2711# Cayman Is 2712# See America/Panama. 2713 2714# Costa Rica 2715 2716# Milne gives -5:36:13.3 as San José mean time; round to nearest. 2717 2718# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2719Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 2720Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 2721Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 2722# IATA SSIM (1991-09) says the following was at 1:00; 2723# go with Shanks & Pottenger. 2724Rule CR 1991 only - Jul 1 0:00 0 S 2725Rule CR 1992 only - Mar 15 0:00 0 S 2726# There are too many San Josés elsewhere, so we'll use 'Costa Rica'. 2727# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2728Zone America/Costa_Rica -5:36:13 - LMT 1890 # San José 2729 -5:36:13 - SJMT 1921 Jan 15 # San José Mean Time 2730 -6:00 CR C%sT 2731# Coco 2732# no information; probably like America/Costa_Rica 2733 2734# Cuba 2735 2736# From Paul Eggert (2013-02-21): 2737# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57 2738# for the port, and -5:30 for meteorological observations. 2739# For now, stick with Shanks & Pottenger. 2740 2741# From Arthur David Olson (1999-03-29): 2742# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 2743# the Cuban National Team and the Baltimore Orioles was carried live on 2744# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 2745# During the game, play-by-play announcer Jim Hunter noted that 2746# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 2747# Time today." (The "two hour" remark referred to losing one hour of 2748# sleep on 1999-03-28 - when the announcers were in Cuba as it switched 2749# to DST - and one more hour on 1999-04-04 - when the announcers will have 2750# returned to Baltimore, which switches on that date.) 2751 2752# From Steffen Thorsen (2013-11-11): 2753# DST start in Cuba in 2004 ... does not follow the same rules as the 2754# years before. The correct date should be Sunday 2004-03-28 00:00 ... 2755# https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html 2756 2757# From Evert van der Veer via Steffen Thorsen (2004-10-28): 2758# Cuba is not going back to standard time this year. 2759# From Paul Eggert (2006-03-22): 2760# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 2761# says that it's due to a problem at the Antonio Guiteras 2762# thermoelectric plant, and says "This October there will be no return 2763# to normal hours (after daylight saving time)". 2764# For now, let's assume that it's a temporary measure. 2765 2766# From Carlos A. Carnero Delgado (2005-11-12): 2767# This year (just like in 2004-2005) there's no change in time zone 2768# adjustment in Cuba. We will stay in daylight saving time: 2769# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html 2770 2771# From Jesper Nørgaard Welen (2006-10-21): 2772# An article in GRANMA INTERNACIONAL claims that Cuba will end 2773# the 3 years of permanent DST next weekend, see 2774# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html 2775# "On Saturday night, October 28 going into Sunday, October 29, at 01:00, 2776# watches should be set back one hour - going back to 00:00 hours - returning 2777# to the normal schedule.... 2778 2779# From Paul Eggert (2007-03-02): 2780# <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday, 2781# says Cuban clocks will advance at midnight on March 10. 2782# For lack of better information, assume Cuba will use US rules, 2783# except that it switches at midnight standard time as usual. 2784# 2785# From Steffen Thorsen (2007-10-25): 2786# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week 2787# earlier - on the last Sunday of October, just like in 2006. 2788# 2789# He supplied these references: 2790# 2791# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES 2792# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm 2793# 2794# From Alex Krivenyshev (2007-10-25): 2795# Here is also article from Granma (Cuba): 2796# 2797# Regirá el Horario Normal desde el próximo domingo 28 de octubre 2798# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html 2799# 2800# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html 2801 2802# From Arthur David Olson (2008-03-09): 2803# I'm in Maryland which is now observing United States Eastern Daylight 2804# Time. At 9:44 local time I used RealPlayer to listen to 2805# http://media.enet.cu/radioreloj 2806# a Cuban information station, and heard 2807# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"), 2808# indicating that Cuba is still on standard time. 2809 2810# From Steffen Thorsen (2008-03-12): 2811# It seems that Cuba will start DST on Sunday, 2007-03-16... 2812# It was announced yesterday, according to this source (in Spanish): 2813# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm 2814# 2815# Some more background information is posted here: 2816# http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html 2817# 2818# The article also says that Cuba has been observing DST since 1963, 2819# while Shanks (and tzdata) has 1965 as the first date (except in the 2820# 1940's). Many other web pages in Cuba also claim that it has been 2821# observed since 1963, but with the exception of 1970 - an exception 2822# which is not present in tzdata/Shanks. So there is a chance we need to 2823# change some historic records as well. 2824# 2825# One example: 2826# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm 2827 2828# From Jesper Nørgaard Welen (2008-03-13): 2829# The Cuban time change has just been confirmed on the most authoritative 2830# web site, the Granma. Please check out 2831# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html 2832# 2833# Basically as expected after Steffen Thorsen's information, the change 2834# will take place midnight between Saturday and Sunday. 2835 2836# From Arthur David Olson (2008-03-12): 2837# Assume Sun>=15 (third Sunday) going forward. 2838 2839# From Alexander Krivenyshev (2009-03-04) 2840# According to the Radio Reloj - Cuba will start Daylight Saving Time on 2841# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009- 2842# not on midnight March 14 / March 15 as previously thought. 2843# 2844# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html 2845# (in Spanish) 2846 2847# From Arthur David Olson (2009-03-09) 2848# I listened over the Internet to 2849# http://media.enet.cu/readioreloj 2850# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the 2851# the time was announced as "diez cinco" - the same time as here, indicating 2852# that has indeed switched to DST. Assume second Sunday from 2009 forward. 2853 2854# From Steffen Thorsen (2011-03-08): 2855# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00 2856# this year. Nothing about the end date known so far (if that has 2857# changed at all). 2858# 2859# Source: 2860# http://granma.co.cu/2011/03/08/nacional/artic01.html 2861# 2862# Our info: 2863# http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html 2864# 2865# From Steffen Thorsen (2011-10-30) 2866# Cuba will end DST two weeks later this year. Instead of going back 2867# tonight, it has been delayed to 2011-11-13 at 01:00. 2868# 2869# One source (Spanish) 2870# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html 2871# 2872# Our page: 2873# http://www.timeanddate.com/news/time/cuba-time-changes-2011.html 2874# 2875# From Steffen Thorsen (2012-03-01) 2876# According to Radio Reloj, Cuba will start DST on Midnight between March 2877# 31 and April 1. 2878# 2879# Radio Reloj has the following info (Spanish): 2880# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril 2881# 2882# Our info on it: 2883# http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html 2884 2885# From Steffen Thorsen (2012-11-03): 2886# Radio Reloj and many other sources report that Cuba is changing back 2887# to standard time on 2012-11-04: 2888# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre 2889# From Paul Eggert (2012-11-03): 2890# For now, assume the future rule is first Sunday in November. 2891 2892# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2893Rule Cuba 1928 only - Jun 10 0:00 1:00 D 2894Rule Cuba 1928 only - Oct 10 0:00 0 S 2895Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 2896Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 2897Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 2898Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 2899Rule Cuba 1965 only - Jun 1 0:00 1:00 D 2900Rule Cuba 1965 only - Sep 30 0:00 0 S 2901Rule Cuba 1966 only - May 29 0:00 1:00 D 2902Rule Cuba 1966 only - Oct 2 0:00 0 S 2903Rule Cuba 1967 only - Apr 8 0:00 1:00 D 2904Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 2905Rule Cuba 1968 only - Apr 14 0:00 1:00 D 2906Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 2907Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 2908Rule Cuba 1972 1974 - Oct 8 0:00 0 S 2909Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 2910Rule Cuba 1978 only - May 7 0:00 1:00 D 2911Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 2912Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 2913Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 2914Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 2915Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 2916Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 2917Rule Cuba 1996 only - Oct 6 0:00s 0 S 2918Rule Cuba 1997 only - Oct 12 0:00s 0 S 2919Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 2920Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 2921Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D 2922Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D 2923Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S 2924Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D 2925Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D 2926Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D 2927Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D 2928Rule Cuba 2011 only - Nov 13 0:00s 0 S 2929Rule Cuba 2012 only - Apr 1 0:00s 1:00 D 2930Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S 2931Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D 2932 2933# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2934Zone America/Havana -5:29:28 - LMT 1890 2935 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 2936 -5:00 Cuba C%sT 2937 2938# Dominica 2939# See America/Port_of_Spain. 2940 2941# Dominican Republic 2942 2943# From Steffen Thorsen (2000-10-30): 2944# Enrique Morales reported to me that the Dominican Republic has changed the 2945# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 2946# http://www.listin.com.do/antes/261000/republica/princi.html 2947 2948# From Paul Eggert (2000-12-04): 2949# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 2950 2951# From Rives McDow (2000-12-01): 2952# Dominican Republic changed its mind and presidential decree on Tuesday, 2953# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 2954# Dominican Republic will be reverting to 8 hours from the International Date 2955# Line, and will not be using DST in the foreseeable future. The reason they 2956# decided to use DST was to be in synch with Puerto Rico, who was also going 2957# to implement DST. When Puerto Rico didn't implement DST, the president 2958# decided to revert. 2959 2960 2961# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2962Rule DR 1966 only - Oct 30 0:00 1:00 D 2963Rule DR 1967 only - Feb 28 0:00 0 S 2964Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 2965Rule DR 1970 only - Feb 21 0:00 0 S 2966Rule DR 1971 only - Jan 20 0:00 0 S 2967Rule DR 1972 1974 - Jan 21 0:00 0 S 2968# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2969Zone America/Santo_Domingo -4:39:36 - LMT 1890 2970 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 2971 -5:00 DR E%sT 1974 Oct 27 2972 -4:00 - AST 2000 Oct 29 2:00 2973 -5:00 US E%sT 2000 Dec 3 1:00 2974 -4:00 - AST 2975 2976# El Salvador 2977 2978# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2979Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 2980Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 2981# There are too many San Salvadors elsewhere, so use America/El_Salvador 2982# instead of America/San_Salvador. 2983# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2984Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 2985 -6:00 Salv C%sT 2986 2987# Grenada 2988# Guadeloupe 2989# St Barthélemy 2990# St Martin (French part) 2991# See America/Port_of_Spain. 2992 2993# Guatemala 2994# 2995# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen: 2996# Diario Co Latino, at 2997# <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>, 2998# says in an article dated 2006-04-19 that the Guatemalan government had 2999# decided on that date to advance official time by 60 minutes, to lessen the 3000# impact of the elevated cost of oil.... Daylight saving time will last from 3001# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified). 3002# From Paul Eggert (2006-06-22): 3003# The Ministry of Energy and Mines, press release CP-15/2006 3004# (2006-04-19), says DST ends at 24:00. See 3005# http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf 3006 3007# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3008Rule Guat 1973 only - Nov 25 0:00 1:00 D 3009Rule Guat 1974 only - Feb 24 0:00 0 S 3010Rule Guat 1983 only - May 21 0:00 1:00 D 3011Rule Guat 1983 only - Sep 22 0:00 0 S 3012Rule Guat 1991 only - Mar 23 0:00 1:00 D 3013Rule Guat 1991 only - Sep 7 0:00 0 S 3014Rule Guat 2006 only - Apr 30 0:00 1:00 D 3015Rule Guat 2006 only - Oct 1 0:00 0 S 3016# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3017Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 3018 -6:00 Guat C%sT 3019 3020# Haiti 3021# From Gwillim Law (2005-04-15): 3022# Risto O. Nykänen wrote me that Haiti is now on DST. 3023# I searched for confirmation, and I found a press release 3024# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 3025# <http://www.haitianconsulate.org/time.doc>. Translated from French, it says: 3026# 3027# "The Prime Minister's Communication Office notifies the public in general 3028# and the press in particular that, following a decision of the Interior 3029# Ministry and the Territorial Collectivities [I suppose that means the 3030# provinces], Haiti will move to Eastern Daylight Time in the night from next 3031# Saturday the 2nd to Sunday the 3rd. 3032# 3033# "Consequently, the Prime Minister's Communication Office wishes to inform 3034# the population that the country's clocks will be set forward one hour 3035# starting at midnight. This provision will hold until the last Saturday in 3036# October 2005. 3037# 3038# "Port-au-Prince, March 31, 2005" 3039# 3040# From Steffen Thorsen (2006-04-04): 3041# I have been informed by users that Haiti observes DST this year like 3042# last year, so the current "only" rule for 2005 might be changed to a 3043# "max" rule or to last until 2006. (Who knows if they will observe DST 3044# next year or if they will extend their DST like US/Canada next year). 3045# 3046# I have found this article about it (in French): 3047# http://www.haitipressnetwork.com/news.cfm?articleID=7612 3048# 3049# The reason seems to be an energy crisis. 3050 3051# From Stephen Colebourne (2007-02-22): 3052# Some IATA info: Haiti won't be having DST in 2007. 3053 3054# From Steffen Thorsen (2012-03-11): 3055# According to several news sources, Haiti will observe DST this year, 3056# apparently using the same start and end date as USA/Canada. 3057# So this means they have already changed their time. 3058# 3059# http://www.alterpresse.org/spip.php?article12510 3060# http://radiovision2000haiti.net/home/?p=13253 3061# 3062# From Arthur David Olson (2012-03-11): 3063# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to 3064# 3:00 a.m. rather than the traditional Haitian jump at midnight. 3065# Assume a US-style fall back as well. 3066 3067# From Steffen Thorsen (2013-03-10): 3068# It appears that Haiti is observing DST this year as well, same rules 3069# as US/Canada. They did it last year as well, and it looks like they 3070# are going to observe DST every year now... 3071# 3072# http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/ 3073# http://www.canalplushaiti.net/?p=6714 3074 3075# From Steffen Thorsen (2016-03-12): 3076# Jean Antoine, editor of www.haiti-reference.com informed us that Haiti 3077# are not going on DST this year. Several other resources confirm this: ... 3078# http://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html 3079# http://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/ 3080# http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/ 3081 3082# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3083Rule Haiti 1983 only - May 8 0:00 1:00 D 3084Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 3085Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 3086# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. 3087# Go with IATA. 3088Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 3089Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 3090Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D 3091Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S 3092Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D 3093Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S 3094# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3095Zone America/Port-au-Prince -4:49:20 - LMT 1890 3096 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 3097 -5:00 Haiti E%sT 3098 3099# Honduras 3100# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1. 3101 3102# From Paul Eggert (2006-05-05): 3103# worldtimezone.com reports a 2006-05-02 Spanish-language AP article 3104# saying Honduras will start using DST midnight Saturday, effective 4 3105# months until September. La Tribuna reported today 3106# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president 3107# of Honduras, refused to back down on this. 3108 3109# From Jesper Nørgaard Welen (2006-08-08): 3110# It seems that Honduras has returned from DST to standard time this Monday at 3111# 00:00 hours (prolonging Sunday to 25 hours duration). 3112# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html 3113 3114# From Paul Eggert (2006-08-08): 3115# Also see Diario El Heraldo, The country returns to standard time (2006-08-08). 3116# http://www.elheraldo.hn/nota.php?nid=54941&sec=12 3117# It mentions executive decree 18-2006. 3118 3119# From Steffen Thorsen (2006-08-17): 3120# Honduras will observe DST from 2007 to 2009, exact dates are not 3121# published, I have located this authoritative source: 3122# http://www.presidencia.gob.hn/noticia.aspx?nId=47 3123 3124# From Steffen Thorsen (2007-03-30): 3125# http://www.laprensahn.com/pais_nota.php?id04962=7386 3126# So it seems that Honduras will not enter DST this year.... 3127 3128# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3129Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D 3130Rule Hond 1987 1988 - Sep lastSun 0:00 0 S 3131Rule Hond 2006 only - May Sun>=1 0:00 1:00 D 3132Rule Hond 2006 only - Aug Mon>=1 0:00 0 S 3133# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3134Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 3135 -6:00 Hond C%sT 3136# 3137# Great Swan I ceded by US to Honduras in 1972 3138 3139# Jamaica 3140# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an 3141# unspecified official document, and says "This time is used throughout the 3142# island". Go with Milne. Round to the nearest second as required by zic. 3143# 3144# Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but 3145# Lance Neita writes that Prime Minister Michael Manley decreed it January 5. 3146# Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that 3147# Manley's supporters associated this act with Manley's nickname "Joshua" 3148# (recall that in the Bible the sun stood still at Joshua's request), 3149# and with the Rod of Correction which Manley said he had received from 3150# Haile Selassie, Emperor of Ethiopia. See: 3151# Neita L. The politician in all of us. Jamaica Observer 2014-09-20 3152# http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647 3153# 3154# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3155Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston 3156 -5:07:11 - KMT 1912 Feb # Kingston Mean Time 3157 -5:00 - EST 1974 3158 -5:00 US E%sT 1984 3159 -5:00 - EST 3160 3161# Martinique 3162# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3163Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 3164 -4:04:20 - FFMT 1911 May # Fort-de-France MT 3165 -4:00 - AST 1980 Apr 6 3166 -4:00 1:00 ADT 1980 Sep 28 3167 -4:00 - AST 3168 3169# Montserrat 3170# See America/Port_of_Spain. 3171 3172# Nicaragua 3173# 3174# This uses Shanks & Pottenger for times before 2005. 3175# 3176# From Steffen Thorsen (2005-04-12): 3177# I've got reports from 8 different people that Nicaragua just started 3178# DST on Sunday 2005-04-10, in order to save energy because of 3179# expensive petroleum. The exact end date for DST is not yet 3180# announced, only "September" but some sites also say "mid-September". 3181# Some background information is available on the President's official site: 3182# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 3183# The Decree, no 23-2005 is available here: 3184# 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 3185# 3186# From Paul Eggert (2005-05-01): 3187# The decree doesn't say anything about daylight saving, but for now let's 3188# assume that it is daylight saving.... 3189# 3190# From Gwillim Law (2005-04-21): 3191# The Associated Press story on the time change, which can be found at 3192# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 3193# and elsewhere, says (fifth paragraph, translated from Spanish): "The last 3194# time that a change of clocks was applied to save energy was in the year 2000 3195# during the Arnoldo Alemán administration."... 3196# The northamerica file says that Nicaragua has been on UTC-6 continuously 3197# since December 1998. I wasn't able to find any details of Nicaraguan time 3198# changes in 2000. Perhaps a note could be added to the northamerica file, to 3199# the effect that we have indirect evidence that DST was observed in 2000. 3200# 3201# From Jesper Nørgaard Welen (2005-11-02): 3202# Nicaragua left DST the 2005-10-02 at 00:00 (local time). 3203# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm 3204# (2005-09-26) 3205# 3206# From Jesper Nørgaard Welen (2006-05-05): 3207# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410 3208# (my informal translation) 3209# By order of the president of the republic, Enrique Bolaños, Nicaragua 3210# advanced by sixty minutes their official time, yesterday at 2 in the 3211# morning, and will stay that way until 30th of September. 3212# 3213# From Jesper Nørgaard Welen (2006-09-30): 3214# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf 3215# My informal translation runs: 3216# The natural sun time is restored in all the national territory, in that the 3217# time is returned one hour at 01:00 am of October 1 of 2006. 3218# 3219# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3220Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 3221Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 3222Rule Nic 2005 only - Apr 10 0:00 1:00 D 3223Rule Nic 2005 only - Oct Sun>=1 0:00 0 S 3224Rule Nic 2006 only - Apr 30 2:00 1:00 D 3225Rule Nic 2006 only - Oct Sun>=1 1:00 0 S 3226# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3227Zone America/Managua -5:45:08 - LMT 1890 3228 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 3229 -6:00 - CST 1973 May 3230 -5:00 - EST 1975 Feb 16 3231 -6:00 Nic C%sT 1992 Jan 1 4:00 3232 -5:00 - EST 1992 Sep 24 3233 -6:00 - CST 1993 3234 -5:00 - EST 1997 3235 -6:00 Nic C%sT 3236 3237# Panama 3238# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3239Zone America/Panama -5:18:08 - LMT 1890 3240 -5:19:36 - CMT 1908 Apr 22 # Colón Mean Time 3241 -5:00 - EST 3242Link America/Panama America/Cayman 3243 3244# Puerto Rico 3245# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'. 3246# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3247Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 3248 -4:00 - AST 1942 May 3 3249 -4:00 US A%sT 1946 3250 -4:00 - AST 3251 3252# St Kitts-Nevis 3253# St Lucia 3254# See America/Port_of_Spain. 3255 3256# St Pierre and Miquelon 3257# There are too many St Pierres elsewhere, so we'll use 'Miquelon'. 3258# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3259Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 3260 -4:00 - AST 1980 May 3261 -3:00 - PMST 1987 # Pierre & Miquelon Time 3262 -3:00 Canada PM%sT 3263 3264# St Vincent and the Grenadines 3265# See America/Port_of_Spain. 3266 3267# Turks and Caicos 3268# 3269# From Chris Dunn in 3270# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007 3271# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the 3272# daylight saving dates for time changes have been adjusted to match 3273# the recent U.S. change of dates. 3274# 3275# From Brian Inglis (2007-04-28): 3276# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26] 3277# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three 3278# rows before that there is an out of date entry for Oct: 3279# "Eastern Standard Times Begins 2007 3280# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time" 3281# indicating that the normal ET rules are followed. 3282# 3283# From Paul Eggert (2014-08-19): 3284# The 2014-08-13 Cabinet meeting decided to stay on UTC-4 year-round. See: 3285# http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm 3286# Model this as a switch from EST/EDT to AST ... 3287# From Chris Walton (2014-11-04): 3288# ... the TCI government appears to have delayed the switch to 3289# "permanent daylight saving time" by one year.... 3290# http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm 3291# 3292# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3293Zone America/Grand_Turk -4:44:32 - LMT 1890 3294 -5:07:11 - KMT 1912 Feb # Kingston Mean Time 3295 -5:00 - EST 1979 3296 -5:00 US E%sT 2015 Nov Sun>=1 2:00 3297 -4:00 - AST 3298 3299# British Virgin Is 3300# Virgin Is 3301# See America/Port_of_Spain. 3302 3303 3304# Local Variables: 3305# coding: utf-8 3306# End: 3307