1# tzdb data for North and Central America and environs 2 3# This file is in the public domain, so clarified as of 4# 2009-05-17 by Arthur David Olson. 5 6# also includes Central America and the Caribbean 7 8# This file is by no means authoritative; if you think you know better, 9# go ahead and edit the file (and please send any changes to 10# tz@iana.org for general use in the future). For more, please see 11# the file CONTRIBUTING in the tz distribution. 12 13# From Paul Eggert (1999-03-22): 14# A reliable and entertaining source about time zones is 15# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 16 17############################################################################### 18 19# United States 20 21# From Paul Eggert (1999-03-31): 22# Howse writes (pp 121-125) that time zones were invented by 23# Professor Charles Ferdinand Dowd (1825-1904), 24# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 25# His pamphlet "A System of National Time for Railroads" (1870) 26# was the result of his proposals at the Convention of Railroad Trunk Lines 27# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 28# but in 1872-05 he moved the proposed origin to Greenwich. 29 30# From Paul Eggert (2024-11-18): 31# Dowd's proposal left many details unresolved, such as where to draw 32# lines between time zones. Sandford Fleming of the Canadian Pacific Railway 33# argued for Dowd's proposal in 1876, and Cleveland Abbe of the American 34# Meteorology Society published a report in 1879 recommending four US time 35# zones based on GMT. However, the key individual who made time zones 36# work in the US was William Frederick Allen - railway engineer, 37# managing editor of the Travelers' Guide, and secretary of the 38# General Time Convention, a railway standardization group. Allen 39# spent months in dialogs with scientific and railway leaders, 40# developed a workable plan to institute time zones, and presented it 41# to the General Time Convention on 1883-04-11, saying that his plan 42# meant "local time would be practically abolished" - a plus for 43# railway scheduling. By the next convention on 1883-10-11 nearly all 44# railroads had agreed and it took effect on 1883-11-18. That Sunday 45# was called the "day of two noons", as some locations observed noon 46# twice. Allen witnessed the transition in New York City, writing: 47# 48# I heard the bells of St. Paul's strike on the old time. Four 49# minutes later, obedient to the electrical signal from the Naval 50# Observatory ... the time-ball made its rapid descent, the chimes 51# of old Trinity rang twelve measured strokes, and local time was 52# abandoned, probably forever. 53# 54# Most of the US soon followed suit. See: 55# Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56. 56# https://dx.doi.org/10.2307/3105430 57 58# From Paul Eggert (2005-04-16): 59# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 60# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 61 62# From Paul Eggert (2006-03-22): 63# A good source for time zone historical data in the US is 64# Thomas G. Shanks, The American Atlas (5th edition), 65# San Diego: ACS Publications, Inc. (1991). 66# Make sure you have the errata sheet; the book is somewhat useless without it. 67# It is the source for most of the pre-1991 US entries below. 68 69# From Paul Eggert (2001-03-06): 70# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 71# in his whimsical essay "An Economical Project for Diminishing the Cost 72# of Light" published in the Journal de Paris (1784-04-26). 73# Not everyone is happy with the results: 74# 75# I don't really care how time is reckoned so long as there is some 76# agreement about it, but I object to being told that I am saving 77# daylight when my reason tells me that I am doing nothing of the kind. 78# I even object to the implication that I am wasting something 79# valuable if I stay in bed after the sun has risen. As an admirer 80# of moonlight I resent the bossy insistence of those who want to 81# reduce my time for enjoying it. At the back of the Daylight Saving 82# scheme I detect the bony, blue-fingered hand of Puritanism, eager 83# to push people into bed earlier, and get them up earlier, to make 84# them healthy, wealthy and wise in spite of themselves. 85# 86# -- Robertson Davies, The diary of Samuel Marchbanks, 87# Clarke, Irwin (1947), XIX, Sunday 88# 89# For more about the first ten years of DST in the United States, see 90# Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint 91# (Carnegie Library of Pittsburgh, 1927). 92# https://web.archive.org/web/20160517155308/http://www.clpgh.org/exhibit/dst.html 93# 94# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 95# However, DST was imposed by the Standard Time Act of 1918, which 96# was the first nationwide legal time standard, and apparently 97# time was just called "Standard Time" or "Daylight Saving Time". 98 99# From Paul Eggert (2019-06-04): 100# Here is the legal basis for the US federal rules. 101# * Public Law 65-106 (1918-03-19) implemented standard and daylight saving 102# time for the first time across the US, springing forward on March's last 103# Sunday and falling back on October's last Sunday. 104# https://www.loc.gov/law/help/statutes-at-large/65th-congress/session-2/c65s2ch24.pdf 105# * Public Law 66-40 (1919-08-20) repealed DST on October 1919's last Sunday. 106# https://www.loc.gov/law/help/statutes-at-large/66th-congress/session-1/c66s1ch51.pdf 107# * Public Law 77-403 (1942-01-20) started wartime DST on 1942-02-09. 108# https://www.loc.gov/law/help/statutes-at-large/77th-congress/session-2/c77s2ch7.pdf 109# * Public Law 79-187 (1945-09-25) ended wartime DST on 1945-09-30. 110# https://www.loc.gov/law/help/statutes-at-large/79th-congress/session-1/c79s1ch388.pdf 111# * Public Law 89-387 (1966-04-13) reinstituted a national standard for DST, 112# from April's last Sunday to October's last Sunday, effective 1967. 113# https://www.govinfo.gov/content/pkg/STATUTE-80/pdf/STATUTE-80-Pg107.pdf 114# * Public Law 93-182 (1973-12-15) moved the 1974 spring-forward to 01-06. 115# https://www.govinfo.gov/content/pkg/STATUTE-87/pdf/STATUTE-87-Pg707.pdf 116# * Public Law 93-434 (1974-10-05) moved the 1975 spring-forward to 117# February's last Sunday. 118# https://www.govinfo.gov/content/pkg/STATUTE-88/pdf/STATUTE-88-Pg1209.pdf 119# * Public Law 99-359 (1986-07-08) moved the spring-forward to April's first 120# Sunday. 121# https://www.govinfo.gov/content/pkg/STATUTE-100/pdf/STATUTE-100-Pg764.pdf 122# * Public Law 109-58 (2005-08-08), effective 2007, moved the spring-forward 123# to March's second Sunday and the fall-back to November's first Sunday. 124# https://www.govinfo.gov/content/pkg/PLAW-109publ58/pdf/PLAW-109publ58.pdf 125# All transitions are at 02:00 local time. 126 127# From Arthur David Olson: 128# Before the Uniform Time Act of 1966 took effect in 1967, observance of 129# Daylight Saving Time in the US was by local option, except during wartime. 130 131# From Arthur David Olson (2000-09-25): 132# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 133# In the introduction, Oboler spoke of "Eastern Peace Time." 134# An AltaVista search turned up: 135# https://web.archive.org/web/20000926032210/http://rowayton.org/rhs/hstaug45.html 136# "When the time is announced over the radio now, it is 'Eastern Peace 137# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 138# (August 1945) by way of confirmation. 139# 140# From Paul Eggert (2017-09-23): 141# This was the V-J Day issue of the Clamdigger, a Rowayton, CT newsletter. 142 143# From Joseph Gallant citing 144# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 145# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 146# to switch to London for Attlee's address, but the American people 147# never got to hear his speech live. According to one press account, 148# CBS' Bob Trout was first to announce the word of Japan's surrender, 149# but a few seconds later, NBC, ABC and Mutual also flashed the word 150# of surrender, all of whom interrupting the bells of Big Ben in 151# London which were to precede Mr. Attlee's speech. 152 153# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 154# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 155# 156# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 157# Any announcement from Asia would reach St. John's New York newsroom on a 158# wire service teletype machine, which had prescribed signals for major news. 159# Associated Press, for example, would ring five bells before spewing out 160# typed copy of an important story, and 10 bells for news "of transcendental 161# importance." 162# 163# On Aug. 14, stalling while talking steadily into the NBC networks' open 164# microphone, St. John heard five bells and waited only to hear a sixth bell, 165# before announcing confidently: "Ladies and gentlemen, World War II is over. 166# The Japanese have agreed to our surrender terms." 167# 168# He had scored a 20-second scoop on other broadcasters. 169 170# From Arthur David Olson (2005-08-22): 171# Paul has been careful to use the "US" rules only in those locations 172# that are part of the United States; this reflects the real scope of 173# U.S. government action. So even though the "US" rules have changed 174# in the latest release, other countries won't be affected. 175 176# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 177Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 178Rule US 1918 1919 - Oct lastSun 2:00 0 S 179Rule US 1942 only - Feb 9 2:00 1:00 W # War 180Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 181Rule US 1945 only - Sep 30 2:00 0 S 182Rule US 1967 2006 - Oct lastSun 2:00 0 S 183Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 184Rule US 1974 only - Jan 6 2:00 1:00 D 185Rule US 1975 only - Feb lastSun 2:00 1:00 D 186Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 187Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 188Rule US 2007 max - Mar Sun>=8 2:00 1:00 D 189Rule US 2007 max - Nov Sun>=1 2:00 0 S 190 191# From U. S. Naval Observatory (1989-01-19): 192# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 193# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 194# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 195# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 196# USA MOUNTAIN 7 H BEHIND UTC DENVER 197# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 198# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 199# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 200# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 201# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 202# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 203# USA " 9 H BEHIND UTC APR 3 - OCT 30 204# USA HAWAII 10 H BEHIND UTC 205# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 206 207# From Arthur David Olson (1989-01-21): 208# The above dates are for 1988. 209# Note the "AKST" and "AKDT" abbreviations, the claim that there's 210# no DST in Samoa, and the claim that there is DST in Alaska and the 211# Aleutians. 212 213# From Arthur David Olson (1988-02-13): 214# Legal standard time zone names, from United States Code (1982 Edition and 215# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 216# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 217# took effect), as explained in sections 263 and 261: 218# (none) 219# United States standard eastern time 220# United States standard mountain time 221# United States standard central time 222# United States standard Pacific time 223# (none) 224# United States standard Alaska time 225# (none) 226# Next, names from 1967-04-01 until 1983-11-30 (the date for 227# public law 98-181): 228# Atlantic standard time 229# eastern standard time 230# central standard time 231# mountain standard time 232# Pacific standard time 233# Yukon standard time 234# Alaska-Hawaii standard time 235# Bering standard time 236# And after 1983-11-30: 237# Atlantic standard time 238# eastern standard time 239# central standard time 240# mountain standard time 241# Pacific standard time 242# Alaska standard time 243# Hawaii-Aleutian standard time 244# Samoa standard time 245# The law doesn't give abbreviations. 246# 247# From Paul Eggert (2016-12-19): 248# Here are URLs for the 1918 and 1966 legislation: 249# http://uscode.house.gov/statviewer.htm?volume=40&page=451 250# http://uscode.house.gov/statviewer.htm?volume=80&page=108 251# Although the 1918 names were officially "United States Standard 252# Eastern Time" and similarly for "Central", "Mountain", "Pacific", 253# and "Alaska", in practice "Standard" was placed just before "Time", 254# as codified in 1966. In practice, Alaska time was abbreviated "AST" 255# before 1968. Summarizing the 1967 name changes: 256# 1918 names 1967 names 257# -08 Standard Pacific Time (PST) Pacific standard time (PST) 258# -09 (unofficial) Yukon (YST) Yukon standard time (YST) 259# -10 Standard Alaska Time (AST) Alaska-Hawaii standard time (AHST) 260# -11 (unofficial) Nome (NST) Bering standard time (BST) 261# 262# From Paul Eggert (2023-01-23), from a 2001-01-08 heads-up from Rives McDow: 263# Public law 106-564 (2000-12-23) introduced "Chamorro standard time" 264# for time in Guam and the Northern Marianas. See the file "australasia". 265# Also see 15 U.S.C. §263 <https://www.law.cornell.edu/uscode/text/15/263>. 266# 267# From Paul Eggert (2015-04-17): 268# HST and HDT are standardized abbreviations for Hawaii-Aleutian 269# standard and daylight times. See section 9.47 (p 234) of the 270# U.S. Government Printing Office Style Manual (2008) 271# https://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf 272 273# From Arthur David Olson, 2005-08-09 274# The following was signed into law on 2005-08-08. 275# 276# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 277# (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15 278# U.S.C. 260a(a)) is amended-- 279# (1) by striking "first Sunday of April" and inserting "second 280# Sunday of March"; and 281# (2) by striking "last Sunday of October" and inserting "first 282# Sunday of November'. 283# (b) Effective Date.--Subsection (a) shall take effect 1 year after the 284# date of enactment of this Act or March 1, 2007, whichever is later. 285# (c) Report to Congress.--Not later than 9 months after the effective 286# date stated in subsection (b), the Secretary shall report to Congress 287# on the impact of this section on energy consumption in the United 288# States. 289# (d) Right to Revert.--Congress retains the right to revert the 290# Daylight Saving Time back to the 2005 time schedules once the 291# Department study is complete. 292 293# US eastern time, represented by New York 294 295# Connecticut, Delaware, District of Columbia, most of Florida, 296# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky 297# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, 298# New Hampshire, New Jersey, New York, North Carolina, Ohio, 299# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 300# Vermont, Virginia, West Virginia 301 302# From Dave Cantor (2004-11-02): 303# Early this summer I had the occasion to visit the Mount Washington 304# Observatory weather station atop (of course!) Mount Washington [, NH].... 305# One of the staff members said that the station was on Eastern Standard Time 306# and didn't change their clocks for Daylight Saving ... so that their 307# reports will always have times which are 5 hours behind UTC. 308 309# From Paul Eggert (2005-08-26): 310# According to today's Huntsville Times 311# http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1 312# a few towns on Alabama's "eastern border with Georgia, such as Phenix City 313# in Russell County, Lanett in Chambers County and some towns in Lee County, 314# set their watches and clocks on Eastern time." It quotes H.H. "Bubba" 315# Roberts, city administrator in Phenix City. as saying "We are in the Central 316# time zone, but we do go by the Eastern time zone because so many people work 317# in Columbus." 318# 319# From Paul Eggert (2017-02-22): 320# Four cities are involved. The two not mentioned above are Smiths Station 321# and Valley. Barbara Brooks, Valley's assistant treasurer, heard it started 322# because West Point Pepperell textile mills were in Alabama while the 323# corporate office was in Georgia, and residents voted to keep Eastern 324# time even after the mills closed. See: Kazek K. Did you know which 325# Alabama towns are in a different time zone? al.com 2017-02-06. 326# http://www.al.com/living/index.ssf/2017/02/do_you_know_which_alabama_town.html 327 328# From Paul Eggert (2014-09-06): 329# Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208 330# says that New York City Hall time was 3 minutes 58.4 seconds fast of 331# Eastern time (i.e., -4:56:01.6) just before the 1883 switch. 332 333# Rule NAME FROM TO - IN ON AT SAVE LETTER 334Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 335Rule NYC 1920 only - Oct lastSun 2:00 0 S 336Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 337Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 338Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 339# Zone NAME STDOFF RULES FORMAT [UNTIL] 340 #STDOFF -4:56:01.6 341Zone America/New_York -4:56:02 - LMT 1883 Nov 18 17:00u 342 -5:00 US E%sT 1920 343 -5:00 NYC E%sT 1942 344 -5:00 US E%sT 1946 345 -5:00 NYC E%sT 1967 346 -5:00 US E%sT 347 348# US central time, represented by Chicago 349 350# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 351# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 352# Washington counties), Illinois, western Indiana 353# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 354# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 355# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 356# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 357# western Tennessee, most of Texas, Wisconsin 358 359# From Paul Eggert (2018-01-07): 360# In 1869 the Chicago Astronomical Society contracted with the city to keep 361# time. Though delayed by the Great Fire, by 1880 a wire ran from the 362# Dearborn Observatory (on the University of Chicago campus) to City Hall, 363# which then sent signals to police and fire stations. However, railroads got 364# their time signals from the Allegheny Observatory, the Madison Observatory, 365# the Ann Arbor Observatory, etc., so their clocks did not agree with each 366# other or with the city's official time. The confusion took some years to 367# clear up. See: 368# Moser M. How Chicago gave America its time zones. Chicago. 2018-01-04. 369# http://www.chicagomag.com/city-life/January-2018/How-Chicago-Gave-America-Its-Time-Zones/ 370 371# From Larry M. Smith (2006-04-26) re Wisconsin: 372# https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf 373# is currently enforced at the 01:00 time of change. Because the local 374# "bar time" in the state corresponds to 02:00, a number of citations 375# are issued for the "sale of class 'B' alcohol after prohibited 376# hours" within the deviated hour of this change every year.... 377# 378# From Douglas R. Bomberg (2007-03-12): 379# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI 380# Statue 175 closer in synch with the US Congress' intent.... 381# https://docs.legis.wisconsin.gov/2007/related/acts/3 382 383# From an email administrator of the City of Fort Pierre, SD (2015-12-21): 384# Fort Pierre is technically located in the Mountain time zone as is 385# the rest of Stanley County. Most of Stanley County and Fort Pierre 386# uses the Central time zone due to doing most of their business in 387# Pierre so it simplifies schedules. I have lived in Stanley County 388# all my life and it has been that way since I can remember. (43 years!) 389# 390# From Paul Eggert (2015-12-25): 391# Assume this practice predates 1970, so Fort Pierre can use America/Chicago. 392 393# From Paul Eggert (2015-04-06): 394# In 1950s Nashville a public clock had dueling faces, one for conservatives 395# and the other for liberals; the two sides didn't agree about the time of day. 396# I haven't found a photo of this clock, nor have I tracked down the TIME 397# magazine report cited below, but here's the story as told by the late 398# American journalist John Seigenthaler, who was there: 399# 400# "The two [newspaper] owners held strongly contrasting political and 401# ideological views. Evans was a New South liberal, Stahlman an Old South 402# conservative, and their two papers frequently clashed editorially, often on 403# the same day.... In the 1950s as the state legislature was grappling with 404# the question of whether to approve daylight saving time for the entire state, 405# TIME magazine reported: 406# 407# "'The Nashville Banner and The Nashville Tennessean rarely agree on anything 408# but the time of day - and last week they couldn't agree on that.' 409# 410# "It was all too true. The clock on the front of the building had two faces - 411# The Tennessean side of the building facing west, the other, east. When it 412# was high noon Banner time, it was 11 a.m. Tennessean time." 413# 414# Seigenthaler J. For 100 years, Tennessean had it covered. 415# The Tennessean 2007-05-11, republished 2015-04-06. 416# https://www.tennessean.com/story/insider/extras/2015/04/06/archives-seigenthaler-for-100-years-the-tennessean-had-it-covered/25348545/ 417 418# Rule NAME FROM TO - IN ON AT SAVE LETTER 419Rule Chicago 1920 only - Jun 13 2:00 1:00 D 420Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 421Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 422Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 423Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 424Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 425# Zone NAME STDOFF RULES FORMAT [UNTIL] 426Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 18:00u 427 -6:00 US C%sT 1920 428 -6:00 Chicago C%sT 1936 Mar 1 2:00 429 -5:00 - EST 1936 Nov 15 2:00 430 -6:00 Chicago C%sT 1942 431 -6:00 US C%sT 1946 432 -6:00 Chicago C%sT 1967 433 -6:00 US C%sT 434# Oliver County, ND switched from mountain to central time on 1992-10-25. 435Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 19:00u 436 -7:00 US M%sT 1992 Oct 25 2:00 437 -6:00 US C%sT 438# Morton County, ND, switched from mountain to central time on 439# 2003-10-26, except for the area around Mandan which was already central time. 440# See <http://dmses.dot.gov/docimages/p63/135818.pdf>. 441# Officially this switch also included part of Sioux County, and 442# Jones, Mellette, and Todd Counties in South Dakota; 443# but in practice these other counties were already observing central time. 444# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>. 445Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 19:00u 446 -7:00 US M%sT 2003 Oct 26 2:00 447 -6:00 US C%sT 448 449# From Josh Findley (2011-01-21): 450# ...it appears that Mercer County, North Dakota, changed from the 451# mountain time zone to the central time zone at the last transition from 452# daylight-saving to standard time (on Nov. 7, 2010): 453# https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm 454# http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html 455 456# From Andy Lipscomb (2011-01-24): 457# ...according to the Census Bureau, the largest city is Beulah (although 458# it's commonly referred to as Beulah-Hazen, with Hazen being the next 459# largest city in Mercer County). Google Maps places Beulah's city hall 460# at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07". 461 462Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 19:00u 463 -7:00 US M%sT 2010 Nov 7 2:00 464 -6:00 US C%sT 465 466# US mountain time, represented by Denver 467# 468# Colorado, far western Kansas, Montana, western 469# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 470# New Mexico, southwestern North Dakota, 471# western South Dakota, far western Texas (El Paso County, Hudspeth County, 472# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 473# 474# From Paul Eggert (2018-10-25): 475# On 1921-03-04 federal law placed all of Texas into the central time zone. 476# However, El Paso ignored the law for decades and continued to observe 477# mountain time, on the grounds that that's what they had always done 478# and they weren't about to let the federal government tell them what to do. 479# Eventually the federal government gave in and changed the law on 480# 1970-04-10 to match what El Paso was actually doing. Although 481# that's slightly after our 1970 cutoff, there is no need to create a 482# separate zone for El Paso since they were ignoring the law anyway. See: 483# Long T. El Pasoans were time rebels, fought to stay in Mountain zone. 484# El Paso Times. 2018-10-24 06:40 -06. 485# https://www.elpasotimes.com/story/news/local/el-paso/2018/10/24/el-pasoans-were-time-rebels-fought-stay-mountain-zone/1744509002/ 486# 487# Rule NAME FROM TO - IN ON AT SAVE LETTER 488Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 489Rule Denver 1920 only - Oct lastSun 2:00 0 S 490Rule Denver 1921 only - May 22 2:00 0 S 491Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 492Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 493# Zone NAME STDOFF RULES FORMAT [UNTIL] 494Zone America/Denver -6:59:56 - LMT 1883 Nov 18 19:00u 495 -7:00 US M%sT 1920 496 -7:00 Denver M%sT 1942 497 -7:00 US M%sT 1946 498 -7:00 Denver M%sT 1967 499 -7:00 US M%sT 500 501# US Pacific time, represented by Los Angeles 502# 503# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 504# Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county 505# north of the Salmon River, and the towns of Burgdorf and Warren), 506# Nevada (except West Wendover), Oregon (except the northern ¾ of 507# Malheur county), and Washington 508 509# From Paul Eggert (2016-08-20): 510# In early February 1948, in response to California's electricity shortage, 511# PG&E changed power frequency from 60 to 59.5 Hz during daylight hours, 512# causing electric clocks to lose six minutes per day. (This did not change 513# legal time, and is not part of the data here.) See: 514# Ross SA. An energy crisis from the past: Northern California in 1948. 515# Working Paper No. 8, Institute of Governmental Studies, UC Berkeley, 516# 1973-11. https://escholarship.org/uc/item/8x22k30c 517# 518# In another measure to save electricity, DST was instituted from 1948-03-14 519# at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move 520# the fallback transition earlier. See pages 3-4 of: 521# http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf 522# 523# In response: 524# 525# Governor Warren received a torrent of objecting mail, and it is not too much 526# to speculate that the objections to Daylight Saving Time were one important 527# factor in the defeat of the Dewey-Warren Presidential ticket in California. 528# -- Ross, p 25 529# 530# On December 8 the governor exercised the option, setting the date to January 1 531# (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01). 532# 533# Despite the controversy, in 1949 California voters approved Proposition 12, 534# which established DST from April's last Sunday at 01:00 until September's 535# last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed 536# the fall-back date to October's last Sunday. See: 537# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props 538# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props 539# 540# Rule NAME FROM TO - IN ON AT SAVE LETTER 541Rule CA 1948 only - Mar 14 2:01 1:00 D 542Rule CA 1949 only - Jan 1 2:00 0 S 543Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D 544Rule CA 1950 1961 - Sep lastSun 2:00 0 S 545Rule CA 1962 1966 - Oct lastSun 2:00 0 S 546# Zone NAME STDOFF RULES FORMAT [UNTIL] 547Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 20:00u 548 -8:00 US P%sT 1946 549 -8:00 CA P%sT 1967 550 -8:00 US P%sT 551 552# Alaska 553# AK%sT is the modern abbreviation for -09 per USNO. 554# 555# From Paul Eggert (2017-06-15): 556# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 557# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 558# On Friday, 1867-10-18 (Gregorian), at precisely 15:30 local time, the 559# Russian forts and fleet at Sitka fired salutes to mark the ceremony of 560# formal transfer. See the Sacramento Daily Union (1867-11-14), p 3, col 2. 561# https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SDU18671114.2.12.1 562# Sitka workers did not change their calendars until Sunday, 1867-10-20, 563# and so celebrated two Sundays that week. See: Ahllund T (tr Hallamaa P). 564# From the memoirs of a Finnish workman. Alaska History. 2006 Fall;21(2):1-25. 565# http://alaskahistoricalsociety.org/wp-content/uploads/2016/12/Ahllund-2006-Memoirs-of-a-Finnish-Workman.pdf 566# Include only the time zone part of this transition, ignoring the switch 567# from Julian to Gregorian, since we can't represent the Julian calendar. 568# 569# As far as we know, of the locations mentioned below only Sitka was 570# permanently inhabited in 1867 by anyone using either calendar. 571# (Yakutat was colonized by the Russians in 1799, but the settlement was 572# destroyed in 1805 by a Yakutat-kon war party.) Many of Alaska's inhabitants 573# were unaware of the US acquisition of Alaska, much less of any calendar or 574# time change. However, the Russian-influenced part of Alaska did observe 575# Russian time, and it is more accurate to model this than to ignore it. 576# The database format requires an exact transition time; use the Russian 577# salute as a somewhat-arbitrary time for the formal transfer of control for 578# all of Alaska. Sitka's UTC offset is -9:01:13; adjust its 15:30 to the 579# local times of other Alaskan locations so that they change simultaneously. 580 581# From Paul Eggert (2014-07-18): 582# One opinion of the early 1980s turmoil in Alaska over time zones and 583# daylight saving time appeared as graffiti on a Juneau airport wall: 584# "Welcome to Juneau. Please turn your watch back to the 19th century." 585# See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01. 586# http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html 587# 588# Steve Ferguson (2011-01-31) referred to the following source: 589# Norris F. Keeping time in Alaska: national directives, local response. 590# Alaska History 2001;16(1-2). 591# http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/ 592 593# From Arthur David Olson (2011-02-01): 594# Here's database-relevant material from the 2001 "Alaska History" article: 595# 596# On September 20 [1979]...DOT...officials decreed that on April 27, 597# 1980, Juneau and other nearby communities would move to Yukon Time. 598# Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on 599# Pacific Time. 600# 601# ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the 602# Department's September 1979 decision. Juneau and other communities in 603# northern Southeast reverted to Pacific Time on October 26. 604# 605# On October 28 [1983]...the Metlakatla Indian Community Council voted 606# unanimously to keep the reservation on Pacific Time. 607# 608# According to DOT official Joanne Petrie, Indian reservations are not 609# bound to follow time zones imposed by neighboring jurisdictions. 610# 611# (The last is consistent with how the database now handles the Navajo 612# Nation.) 613 614# From Arthur David Olson (2011-02-09): 615# I just spoke by phone with a staff member at the Metlakatla Indian 616# Community office (using contact information available at 617# http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla 618# It's shortly after 1:00 here on the east coast of the United States; 619# the staffer said it was shortly after 10:00 there. When I asked whether 620# that meant they were on Pacific time, they said no - they were on their 621# own time. I asked about daylight saving; they said it wasn't used. I 622# did not inquire about practices in the past. 623 624# From Arthur David Olson (2011-08-17): 625# For lack of better information, assume that Metlakatla's 626# abandonment of use of daylight saving resulted from the 1983 vote. 627 628# From Steffen Thorsen (2015-11-09): 629# It seems Metlakatla did go off PST on Sunday, November 1, changing 630# their time to AKST and are going to follow Alaska's DST, switching 631# between AKST and AKDT from now on.... 632# https://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/ 633 634# From Ryan Stanley (2018-11-06): 635# The Metlakatla community in Alaska has decided not to change its 636# clock back an hour starting on November 4th, 2018 (day before yesterday). 637# They will be gmtoff=-28800 year-round. 638# https://www.facebook.com/141055983004923/photos/pb.141055983004923.-2207520000.1541465673./569081370202380/ 639 640# From Paul Eggert (2018-12-16): 641# In a 2018-12-11 special election, Metlakatla voted to go back to 642# Alaska time (including daylight saving time) starting next year. 643# https://www.krbd.org/2018/12/12/metlakatla-to-follow-alaska-standard-time-allow-liquor-sales/ 644# 645# From Ryan Stanley (2019-01-11): 646# The community will be changing back on the 20th of this month... 647# From Tim Parenti (2019-01-11): 648# Per an announcement on the Metlakatla community's official Facebook page, the 649# "fall back" will be on Sunday 2019-01-20 at 02:00: 650# https://www.facebook.com/141055983004923/photos/607150969728753/ 651# So they won't be waiting for Alaska to join them on 2019-03-10, but will 652# rather change their clocks twice in seven weeks. 653 654# From Paul Eggert (2023-01-23): 655# America/Adak is for the Aleutian Islands that are part of Alaska 656# and are west of 169.5° W. 657 658# Zone NAME STDOFF RULES FORMAT [UNTIL] 659Zone America/Juneau 15:02:19 - LMT 1867 Oct 19 15:33:32 660 -8:57:41 - LMT 1900 Aug 20 12:00 661 -8:00 - PST 1942 662 -8:00 US P%sT 1946 663 -8:00 - PST 1969 664 -8:00 US P%sT 1980 Apr 27 2:00 665 -9:00 US Y%sT 1980 Oct 26 2:00 666 -8:00 US P%sT 1983 Oct 30 2:00 667 -9:00 US Y%sT 1983 Nov 30 668 -9:00 US AK%sT 669Zone America/Sitka 14:58:47 - LMT 1867 Oct 19 15:30 670 -9:01:13 - LMT 1900 Aug 20 12:00 671 -8:00 - PST 1942 672 -8:00 US P%sT 1946 673 -8:00 - PST 1969 674 -8:00 US P%sT 1983 Oct 30 2:00 675 -9:00 US Y%sT 1983 Nov 30 676 -9:00 US AK%sT 677Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 19 15:44:55 678 -8:46:18 - LMT 1900 Aug 20 12:00 679 -8:00 - PST 1942 680 -8:00 US P%sT 1946 681 -8:00 - PST 1969 682 -8:00 US P%sT 1983 Oct 30 2:00 683 -8:00 - PST 2015 Nov 1 2:00 684 -9:00 US AK%sT 2018 Nov 4 2:00 685 -8:00 - PST 2019 Jan 20 2:00 686 -9:00 US AK%sT 687Zone America/Yakutat 14:41:05 - LMT 1867 Oct 19 15:12:18 688 -9:18:55 - LMT 1900 Aug 20 12:00 689 -9:00 - YST 1942 690 -9:00 US Y%sT 1946 691 -9:00 - YST 1969 692 -9:00 US Y%sT 1983 Nov 30 693 -9:00 US AK%sT 694Zone America/Anchorage 14:00:24 - LMT 1867 Oct 19 14:31:37 695 -9:59:36 - LMT 1900 Aug 20 12:00 696 -10:00 - AST 1942 697 -10:00 US A%sT 1967 Apr 698 -10:00 - AHST 1969 699 -10:00 US AH%sT 1983 Oct 30 2:00 700 -9:00 US Y%sT 1983 Nov 30 701 -9:00 US AK%sT 702Zone America/Nome 12:58:22 - LMT 1867 Oct 19 13:29:35 703 -11:01:38 - LMT 1900 Aug 20 12:00 704 -11:00 - NST 1942 705 -11:00 US N%sT 1946 706 -11:00 - NST 1967 Apr 707 -11:00 - BST 1969 708 -11:00 US B%sT 1983 Oct 30 2:00 709 -9:00 US Y%sT 1983 Nov 30 710 -9:00 US AK%sT 711Zone America/Adak 12:13:22 - LMT 1867 Oct 19 12:44:35 712 -11:46:38 - LMT 1900 Aug 20 12:00 713 -11:00 - NST 1942 714 -11:00 US N%sT 1946 715 -11:00 - NST 1967 Apr 716 -11:00 - BST 1969 717 -11:00 US B%sT 1983 Oct 30 2:00 718 -10:00 US AH%sT 1983 Nov 30 719 -10:00 US H%sT 720# The following switches don't make our 1970 cutoff. 721# 722# Kiska observed Tokyo date and time during Japanese occupation from 723# 1942-06-06 to 1943-07-29, and similarly for Attu from 1942-06-07 to 724# 1943-05-29 (all dates American). Both islands are now uninhabited. 725# 726# Shanks writes that part of southwest Alaska (e.g. Aniak) 727# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 728# and another part (e.g. Akiak) made the same switch five weeks later. 729# 730# From David Flater (2004-11-09): 731# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 732# Historic Preservation Commission, provided this information, which 733# suggests that Unalaska deviated from statutory time from early 1967 734# possibly until 1983: 735# 736# Minutes of the Unalaska City Council Meeting, January 10, 1967: 737# "Except for St. Paul and Akutan, Unalaska is the only important 738# location not on Alaska Standard Time. The following resolution was 739# made by William Robinson and seconded by Henry Swanson: Be it 740# resolved that the City of Unalaska hereby goes to Alaska Standard 741# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 742# January 14, Alaska Standard Time.) This resolution was passed with 743# three votes for and one against." 744 745# Hawaii 746 747# From Arthur David Olson (2010-12-09): 748# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225 749# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09, 750# the article is available at 751# https://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf 752# and indicates that standard time was adopted effective noon, January 753# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight 754# saving for the period between the last Sunday of each April and the 755# last Sunday of each September, but less than a month later repealed the 756# act," (page 220), that year-round daylight saving time was in effect 757# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for 758# when clocks changed) and that clocks were changed by 30 minutes 759# effective the second Sunday of June, 1947 (page 219, with no time of 760# day given for when clocks changed). A footnote for the 1933 changes 761# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933) 762# and Act 163 (approved 21 May 1933)." 763 764# From Arthur David Olson (2011-01-19): 765# The following is from "Laws of the Territory of Hawaii Passed by the 766# Seventeenth Legislature: Regular Session 1933," available (as of 767# 2011-01-19) at American University's Pence Law Library. Page 85: "Act 768# 90...At 2 o'clock ante meridian of the last Sunday in April of each 769# year, the standard time of this Territory shall be advanced one 770# hour...This Act shall take effect upon its approval. Approved this 26th 771# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of 772# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is 773# hereby repealed...This Act shall take effect upon its approval, upon 774# which date the standard time of this Territory shall be restored to 775# that existing immediately prior to the taking effect of said Act 90. 776# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor 777# of the Territory of Hawaii." 778# 779# Note that 1933-05-21 was a Sunday. 780# We're left to guess the time of day when Act 163 was approved; guess noon. 781 782# Zone NAME STDOFF RULES FORMAT [UNTIL] 783Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 784 -10:30 - HST 1933 Apr 30 2:00 785 -10:30 1:00 HDT 1933 May 21 12:00 786 -10:30 US H%sT 1947 Jun 8 2:00 787 -10:00 - HST 788 789# Now we turn to US areas that have diverged from the consensus since 1970. 790 791# Arizona mostly uses MST. 792 793# From Paul Eggert (2002-10-20): 794# 795# The information in the rest of this paragraph is derived from the 796# Daylight Saving Time web page 797# <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23) 798# maintained by the Arizona State Library, Archives and Public Records. 799# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 800# time, but by federal law railroads, airlines, bus lines, military 801# personnel, and some engaged in interstate commerce continued to 802# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 803# Gazette says that was the date the law changed, and that 04-01 was 804# the date the state's clocks would change. In 1945 the State of 805# Arizona used standard time all year, again with exceptions only as 806# mandated by federal law. Arizona observed DST in 1967, but Arizona 807# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 808# 809# Shanks says the 1944 experiment came to an end on 1944-03-17. 810# Go with the Arizona State Library instead. 811 812# Zone NAME STDOFF RULES FORMAT [UNTIL] 813Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 19:00u 814 -7:00 US M%sT 1944 Jan 1 0:01 815 -7:00 - MST 1944 Apr 1 0:01 816 -7:00 US M%sT 1944 Oct 1 0:01 817 -7:00 - MST 1967 818 -7:00 US M%sT 1968 Mar 21 819 -7:00 - MST 820 821# From Arthur David Olson (1988-02-13): 822# A writer from the Inter Tribal Council of Arizona, Inc., 823# notes in private correspondence dated 1987-12-28 that "Presently, only the 824# Navajo Nation participates in the Daylight Saving Time policy, due to its 825# large size and location in three states." (The "only" means that other 826# tribal nations don't use DST.) 827# 828# From Paul Eggert (2013-08-26): 829# See America/Denver for a zone appropriate for the Navajo Nation. 830 831# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 832# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 833# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 834# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 835# Teton, Twin Falls, Valley, Washington counties, and the southern 836# quarter of Idaho county) and eastern Oregon (most of Malheur County) 837# switched four weeks late in 1974. 838# 839# Zone NAME STDOFF RULES FORMAT [UNTIL] 840Zone America/Boise -7:44:49 - LMT 1883 Nov 18 20:00u 841 -8:00 US P%sT 1923 May 13 2:00 842 -7:00 US M%sT 1974 843 -7:00 - MST 1974 Feb 3 2:00 844 -7:00 US M%sT 845 846# Indiana 847# 848# For a map of Indiana's time zone regions, see: 849# https://en.wikipedia.org/wiki/Time_in_Indiana 850# 851# From Paul Eggert (2018-11-30): 852# A brief but entertaining history of time in Indiana describes a 1949 debate 853# in the Indiana House where city legislators (who favored "fast time") 854# tussled with farm legislators (who didn't) over a bill to outlaw DST: 855# "Lacking enough votes, the city faction tries to filibuster until time runs 856# out on the session at midnight, but rural champion Rep. Herbert Copeland, 857# R-Madison, leans over the gallery railing and forces the official clock 858# back to 9 p.m., breaking it in the process. The clock sticks on 9 as the 859# debate rages on into the night. The filibuster finally dies out and the 860# bill passes, while outside the chamber, clocks read 3:30 a.m. In the end, 861# it doesn't matter which side won. The law has no enforcement powers and 862# is simply ignored by fast-time communities." 863# How Indiana went from 'God's time' to split zones and daylight-saving. 864# Indianapolis Star. 2018-11-27 14:58 -05. 865# https://www.indystar.com/story/news/politics/2018/11/27/indianapolis-indiana-time-zone-history-central-eastern-daylight-savings-time/2126300002/ 866# 867# From Paul Eggert (2007-08-17): 868# Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 869# with the following exceptions: 870# 871# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 872# Vanderburgh, and Warrick counties have been like America/Chicago. 873# 874# - Dearborn and Ohio counties have been like America/New_York. 875# 876# - Clark, Floyd, and Harrison counties have been like 877# America/Kentucky/Louisville. 878# 879# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke, 880# and Switzerland counties have their own time zone histories as noted below. 881# 882# Shanks partitioned Indiana into 345 regions, each with its own time history, 883# and wrote "Even newspaper reports present contradictory information." 884# Those Hoosiers! Such a flighty and changeable people! 885# Fortunately, most of the complexity occurred before our cutoff date of 1970. 886# 887# Other than Indianapolis, the Indiana place names are so nondescript 888# that they would be ambiguous if we left them at the 'America' level. 889# So we reluctantly put them all in a subdirectory 'America/Indiana'. 890 891# From Paul Eggert (2014-06-26): 892# https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana 893# says "DOT is relocating the time zone boundary in Indiana to move Starke, 894# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the 895# Eastern Time Zone to the Central Time Zone.... The effective date of 896# this rule is 2 a.m. EST Sunday, April 2, 2006, which is the 897# changeover date from standard time to Daylight Saving Time." 898# Strictly speaking, this meant the affected counties changed their 899# clocks twice that night, but this obviously was in error. The intent 900# was that 01:59:59 EST be followed by 02:00:00 CDT. 901 902# From Gwillim Law (2007-02-10): 903# The Associated Press has been reporting that Pulaski County, Indiana is 904# going to switch from Central to Eastern Time on March 11, 2007.... 905# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL 906 907# Rule NAME FROM TO - IN ON AT SAVE LETTER 908Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 909Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 910Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 911# Zone NAME STDOFF RULES FORMAT [UNTIL] 912Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 18:00u 913 -6:00 US C%sT 1920 914 -6:00 Indianapolis C%sT 1942 915 -6:00 US C%sT 1946 916 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 917 -5:00 - EST 1957 Sep 29 2:00 918 -6:00 - CST 1958 Apr 27 2:00 919 -5:00 - EST 1969 920 -5:00 US E%sT 1971 921 -5:00 - EST 2006 922 -5:00 US E%sT 923# 924# Eastern Crawford County, Indiana, left its clocks alone in 1974, 925# as well as from 1976 through 2005. 926# Rule NAME FROM TO - IN ON AT SAVE LETTER 927Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 928Rule Marengo 1951 only - Sep lastSun 2:00 0 S 929Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 930Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 931# Zone NAME STDOFF RULES FORMAT [UNTIL] 932Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 18:00u 933 -6:00 US C%sT 1951 934 -6:00 Marengo C%sT 1961 Apr 30 2:00 935 -5:00 - EST 1969 936 -5:00 US E%sT 1974 Jan 6 2:00 937 -6:00 1:00 CDT 1974 Oct 27 2:00 938 -5:00 US E%sT 1976 939 -5:00 - EST 2006 940 -5:00 US E%sT 941# 942# Daviess, Dubois, Knox, and Martin Counties, Indiana, 943# switched from eastern to central time in April 2006, then switched back 944# in November 2007. 945# Rule NAME FROM TO - IN ON AT SAVE LETTER 946Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D 947Rule Vincennes 1946 only - Sep lastSun 2:00 0 S 948Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D 949Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S 950Rule Vincennes 1955 only - May 1 0:00 1:00 D 951Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D 952Rule Vincennes 1960 only - Oct lastSun 2:00 0 S 953Rule Vincennes 1961 only - Sep lastSun 2:00 0 S 954Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S 955# Zone NAME STDOFF RULES FORMAT [UNTIL] 956Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 18:00u 957 -6:00 US C%sT 1946 958 -6:00 Vincennes C%sT 1964 Apr 26 2:00 959 -5:00 - EST 1969 960 -5:00 US E%sT 1971 961 -5:00 - EST 2006 Apr 2 2:00 962 -6:00 US C%sT 2007 Nov 4 2:00 963 -5:00 US E%sT 964# 965# Perry County, Indiana, switched from eastern to central time in April 2006. 966# From Alois Treindl (2019-07-09): 967# The Indianapolis News, Friday 27 October 1967 states that Perry County 968# returned to CST. It went again to EST on 27 April 1969, as documented by the 969# Indianapolis star of Saturday 26 April. 970# Rule NAME FROM TO - IN ON AT SAVE LETTER 971Rule Perry 1955 only - May 1 0:00 1:00 D 972Rule Perry 1955 1960 - Sep lastSun 2:00 0 S 973Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D 974Rule Perry 1961 1963 - Oct lastSun 2:00 0 S 975# Zone NAME STDOFF RULES FORMAT [UNTIL] 976Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 18:00u 977 -6:00 US C%sT 1946 978 -6:00 Perry C%sT 1964 Apr 26 2:00 979 -5:00 - EST 1967 Oct 29 2:00 980 -6:00 US C%sT 1969 Apr 27 2:00 981 -5:00 US E%sT 1971 982 -5:00 - EST 2006 Apr 2 2:00 983 -6:00 US C%sT 984# 985# Pike County, Indiana moved from central to eastern time in 1977, 986# then switched back in 2006, then switched back again in 2007. 987# Rule NAME FROM TO - IN ON AT SAVE LETTER 988Rule Pike 1955 only - May 1 0:00 1:00 D 989Rule Pike 1955 1960 - Sep lastSun 2:00 0 S 990Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D 991Rule Pike 1961 1964 - Oct lastSun 2:00 0 S 992# Zone NAME STDOFF RULES FORMAT [UNTIL] 993Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 18:00u 994 -6:00 US C%sT 1955 995 -6:00 Pike C%sT 1965 Apr 25 2:00 996 -5:00 - EST 1966 Oct 30 2:00 997 -6:00 US C%sT 1977 Oct 30 2:00 998 -5:00 - EST 2006 Apr 2 2:00 999 -6:00 US C%sT 2007 Nov 4 2:00 1000 -5:00 US E%sT 1001# 1002# Starke County, Indiana moved from central to eastern time in 1991, 1003# then switched back in 2006. 1004# From Arthur David Olson (1991-10-28): 1005# An article on page A3 of the Sunday, 1991-10-27 Washington Post 1006# notes that Starke County switched from Central time to Eastern time as of 1007# 1991-10-27. 1008# Rule NAME FROM TO - IN ON AT SAVE LETTER 1009Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 1010Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 1011Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 1012Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 1013Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 1014# Zone NAME STDOFF RULES FORMAT [UNTIL] 1015Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 18:00u 1016 -6:00 US C%sT 1947 1017 -6:00 Starke C%sT 1962 Apr 29 2:00 1018 -5:00 - EST 1963 Oct 27 2:00 1019 -6:00 US C%sT 1991 Oct 27 2:00 1020 -5:00 - EST 2006 Apr 2 2:00 1021 -6:00 US C%sT 1022# 1023# Pulaski County, Indiana, switched from eastern to central time in 1024# April 2006 and then switched back in March 2007. 1025# Rule NAME FROM TO - IN ON AT SAVE LETTER 1026Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D 1027Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S 1028Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S 1029Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S 1030# Zone NAME STDOFF RULES FORMAT [UNTIL] 1031Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 18:00u 1032 -6:00 US C%sT 1946 1033 -6:00 Pulaski C%sT 1961 Apr 30 2:00 1034 -5:00 - EST 1969 1035 -5:00 US E%sT 1971 1036 -5:00 - EST 2006 Apr 2 2:00 1037 -6:00 US C%sT 2007 Mar 11 2:00 1038 -5:00 US E%sT 1039# 1040# Switzerland County, Indiana, did not observe DST from 1973 through 2005. 1041# Zone NAME STDOFF RULES FORMAT [UNTIL] 1042Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 18:00u 1043 -6:00 US C%sT 1954 Apr 25 2:00 1044 -5:00 - EST 1969 1045 -5:00 US E%sT 1973 1046 -5:00 - EST 2006 1047 -5:00 US E%sT 1048 1049# From Paul Eggert (2018-03-20): 1050# The Louisville & Nashville Railroad's 1883-11-18 change occurred at 1051# 10:00 old local time; train were supposed to come to a standstill 1052# for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not 1053# clear how this matched civil time in Louisville, so for now continue 1054# to assume Louisville switched at noon new local time, like New York. 1055# 1056# From Michael Deckers (2019-08-06): 1057# From the contemporary source given by Alois Treindl, 1058# the switch in Louisville on 1946-04-28 was on 00:01 1059# From Paul Eggert (2019-08-26): 1060# That source was the Louisville Courier-Journal, 1946-04-27, p 4. 1061# Shanks gives 02:00 for all 20th-century transition times in Louisville. 1062# Evidently this is wrong for spring 1946. Although also likely wrong 1063# for other dates, we have no data. 1064# 1065# Part of Kentucky left its clocks alone in 1974. 1066# This also includes Clark, Floyd, and Harrison counties in Indiana. 1067# Rule NAME FROM TO - IN ON AT SAVE LETTER 1068Rule Louisville 1921 only - May 1 2:00 1:00 D 1069Rule Louisville 1921 only - Sep 1 2:00 0 S 1070Rule Louisville 1941 only - Apr lastSun 2:00 1:00 D 1071Rule Louisville 1941 only - Sep lastSun 2:00 0 S 1072Rule Louisville 1946 only - Apr lastSun 0:01 1:00 D 1073Rule Louisville 1946 only - Jun 2 2:00 0 S 1074Rule Louisville 1950 1961 - Apr lastSun 2:00 1:00 D 1075Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 1076Rule Louisville 1956 1961 - Oct lastSun 2:00 0 S 1077# Zone NAME STDOFF RULES FORMAT [UNTIL] 1078Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 18:00u 1079 -6:00 US C%sT 1921 1080 -6:00 Louisville C%sT 1942 1081 -6:00 US C%sT 1946 1082 -6:00 Louisville C%sT 1961 Jul 23 2:00 1083 -5:00 - EST 1968 1084 -5:00 US E%sT 1974 Jan 6 2:00 1085 -6:00 1:00 CDT 1974 Oct 27 2:00 1086 -5:00 US E%sT 1087# 1088# Wayne County, Kentucky 1089# 1090# From Lake Cumberland LIFE 1091# http://www.lake-cumberland.com/life/archive/news990129time.shtml 1092# (1999-01-29) via WKYM-101.7: 1093# Clinton County has joined Wayne County in asking the DoT to change from 1094# the Central to the Eastern time zone.... The Wayne County government made 1095# the same request in December. And while Russell County officials have not 1096# taken action, the majority of respondents to a poll conducted there in 1097# August indicated they would like to change to "fast time" also. 1098# The three Lake Cumberland counties are the farthest east of any U.S. 1099# location in the Central time zone. 1100# 1101# From Rich Wales (2000-08-29): 1102# After prolonged debate, and despite continuing deep differences of opinion, 1103# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 1104# (-0500) time. They won't "fall back" this year. See Sara Shipley, 1105# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 1106# 1107# From Paul Eggert (2001-07-16): 1108# The final rule was published in the 1109# Federal Register 65, 160 (2000-08-17), pp 50154-50158. 1110# https://www.gpo.gov/fdsys/pkg/FR-2000-08-17/html/00-20854.htm 1111# 1112Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 18:00u 1113 -6:00 US C%sT 1946 1114 -6:00 - CST 1968 1115 -6:00 US C%sT 2000 Oct 29 2:00 1116 -5:00 US E%sT 1117 1118 1119# From Rives McDow (2000-08-30): 1120# Here ... are all the changes in the US since 1985. 1121# Kearny County, KS (put all of county on central; 1122# previously split between MST and CST) ... 1990-10 1123# Starke County, IN (from CST to EST) ... 1991-10 1124# Oliver County, ND (from MST to CST) ... 1992-10 1125# West Wendover, NV (from PST TO MST) ... 1999-10 1126# Wayne County, KY (from CST to EST) ... 2000-10 1127# 1128# From Paul Eggert (2001-07-17): 1129# We don't know where the line used to be within Kearny County, KS, 1130# so omit that change for now. 1131# See America/Indiana/Knox for the Starke County, IN change. 1132# See America/North_Dakota/Center for the Oliver County, ND change. 1133# West Wendover, NV officially switched from Pacific to mountain time on 1134# 1999-10-31. See the 1135# Federal Register 64, 203 (1999-10-21), pp 56705-56707. 1136# https://www.gpo.gov/fdsys/pkg/FR-1999-10-21/html/99-27240.htm 1137# However, the Federal Register says that West Wendover already operated 1138# on mountain time, and the rule merely made this official; 1139# hence a separate tz entry is not needed. 1140 1141# Michigan 1142# 1143# From Bob Devine (1988-01-28): 1144# Michigan didn't observe DST from 1968 to 1973. 1145# 1146# From Paul Eggert (1999-03-31): 1147# Shanks writes that Michigan started using standard time on 1885-09-18, 1148# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 1149# that Detroit kept 1150# 1151# local time until 1900 when the City Council decreed that clocks should 1152# be put back twenty-eight minutes to Central Standard Time. Half the 1153# city obeyed, half refused. After considerable debate, the decision 1154# was rescinded and the city reverted to Sun time. A derisive offer to 1155# erect a sundial in front of the city hall was referred to the 1156# Committee on Sewers. Then, in 1905, Central time was adopted 1157# by city vote. 1158# 1159# This story is too entertaining to be false, so go with Howse over Shanks. 1160# 1161# From Paul Eggert (2001-03-06): 1162# Garland (1927) writes "Cleveland and Detroit advanced their clocks 1163# one hour in 1914." This change is not in Shanks. We have no more 1164# info, so omit this for now. 1165# 1166# From Paul Eggert (2019-07-06): 1167# Due to a complicated set of legal maneuvers, in 1967 Michigan did 1168# not start daylight saving time when the rest of the US did. 1169# Instead, it began DST on Jun 14 at 00:01. This was big news: 1170# the Detroit Free Press reported it at the top of Page 1 on 1171# 1967-06-14, in an article "State Adjusting to Switch to Fast Time" 1172# by Gary Blonston, above an article about Thurgood Marshall's 1173# confirmation to the US Supreme Court. Although Shanks says Detroit 1174# observed DST until 1967-10-29 00:01, that time of day seems to be 1175# incorrect, as the Free Press later said DST ended in Michigan at the 1176# same time as the rest of the US. Also, although Shanks reports no DST in 1177# Detroit in 1968, it did observe DST that year; in the November 1968 1178# election Michigan voters narrowly repealed DST, effective 1969. 1179# 1180# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 1181# Rule NAME FROM TO - IN ON AT SAVE LETTER 1182Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 1183Rule Detroit 1948 only - Sep lastSun 2:00 0 S 1184# Zone NAME STDOFF RULES FORMAT [UNTIL] 1185Zone America/Detroit -5:32:11 - LMT 1905 1186 -6:00 - CST 1915 May 15 2:00 1187 -5:00 - EST 1942 1188 -5:00 US E%sT 1946 1189 -5:00 Detroit E%sT 1967 Jun 14 0:01 1190 -5:00 US E%sT 1969 1191 -5:00 - EST 1973 1192 -5:00 US E%sT 1975 1193 -5:00 - EST 1975 Apr 27 2:00 1194 -5:00 US E%sT 1195# 1196# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan, 1197# switched from EST to CST/CDT in 1973. 1198# Rule NAME FROM TO - IN ON AT SAVE LETTER 1199Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 1200Rule Menominee 1946 only - Sep lastSun 2:00 0 S 1201Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 1202Rule Menominee 1966 only - Oct lastSun 2:00 0 S 1203# Zone NAME STDOFF RULES FORMAT [UNTIL] 1204Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 1205 -6:00 US C%sT 1946 1206 -6:00 Menominee C%sT 1969 Apr 27 2:00 1207 -5:00 - EST 1973 Apr 29 2:00 1208 -6:00 US C%sT 1209 1210# Navassa 1211# administered by the US Fish and Wildlife Service 1212# claimed by US under the provisions of the 1856 Guano Islands Act 1213# also claimed by Haiti 1214# occupied 1857/1900 by the Navassa Phosphate Co 1215# US lighthouse 1917/1996-09 1216# currently uninhabited 1217# see Mark Fineman, "An Isle Rich in Guano and Discord", 1218# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 1219# Jimmy Skaggs, _The Great Guano Rush_ (1994). 1220 1221################################################################################ 1222 1223 1224# From Paul Eggert (2017-02-10): 1225# 1226# Unless otherwise specified, the source for data through 1990 is: 1227# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 1228# San Diego: ACS Publications, Inc. (2003). 1229# Unfortunately this book contains many errors and cites no sources. 1230# 1231# Many years ago Gwillim Law wrote that a good source 1232# for time zone data was the International Air Transport 1233# Association's Standard Schedules Information Manual (IATA SSIM), 1234# published semiannually. Law sent in several helpful summaries 1235# of the IATA's data after 1990. Except where otherwise noted, 1236# IATA SSIM is the source for entries after 1990. 1237# 1238# Other sources occasionally used include: 1239# 1240# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94 1241# <https://www.jstor.org/stable/1774359>. 1242# 1243# Pearce C. The Great Daylight Saving Time Controversy. 1244# Australian Ebook Publisher. 2017. ISBN 978-1-925516-96-8. 1245# 1246# Edward W. Whitman, World Time Differences, 1247# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 1248# which I found in the UCLA library. 1249# 1250# William Willett, The Waste of Daylight, 19th edition 1251# <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf> 1252# [PDF] (1914-03) 1253# 1254# For the 1911/1912 establishment of standard time in French possessions, see: 1255# Société Française de Physique, Recueil de constantes physiques (1913), 1256# page 752, 18b. 1257# 1258# See the 'europe' file for Greenland. 1259 1260# Canada 1261 1262# From Alain LaBonté (1994-11-14): 1263# I post here the time zone abbreviations standardized in Canada 1264# for both English and French in the CAN/CSA-Z234.4-89 standard.... 1265# 1266# UTC Standard time Daylight saving time 1267# offset French English French English 1268# -2:30 - - HAT NDT 1269# -3 - - HAA ADT 1270# -3:30 HNT NST - - 1271# -4 HNA AST HAE EDT 1272# -5 HNE EST HAC CDT 1273# -6 HNC CST HAR MDT 1274# -7 HNR MST HAP PDT 1275# -8 HNP PST HAY YDT 1276# -9 HNY YST - - 1277# 1278# HN: Heure Normale ST: Standard Time 1279# HA: Heure Avancée DT: Daylight saving Time 1280# 1281# A: de l'Atlantique Atlantic 1282# C: du Centre Central 1283# E: de l'Est Eastern 1284# M: Mountain 1285# N: Newfoundland 1286# P: du Pacifique Pacific 1287# R: des Rocheuses 1288# T: de Terre-Neuve 1289# Y: du Yukon Yukon 1290# 1291# From Paul Eggert (1994-11-22): 1292# Alas, this sort of thing must be handled by localization software. 1293 1294# Unless otherwise specified, the data entries for Canada are all from Shanks 1295# & Pottenger. 1296 1297# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31, 1298# 2007-03-01): 1299# The British Columbia government announced yesterday that it will 1300# adjust daylight savings next year to align with changes in the 1301# U.S. and the rest of Canada.... 1302# https://archive.news.gov.bc.ca/releases/news_releases_2005-2009/2006AG0014-000330.htm 1303# ... 1304# Nova Scotia 1305# Daylight saving time will be extended by four weeks starting in 2007.... 1306# https://www.novascotia.ca/just/regulations/rg2/2006/ma1206.pdf 1307# 1308# [For New Brunswick] the new legislation dictates that the time change is to 1309# be done at 02:00 instead of 00:01. 1310# https://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf 1311# ... 1312# Manitoba has traditionally changed the clock every fall at 03:00. 1313# As of 2006, the transition is to take place one hour earlier at 02:00. 1314# https://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php 1315# ... 1316# [Alberta, Ontario, Quebec] will follow US rules. 1317# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM 1318# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm 1319# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF 1320# ... 1321# P.E.I. will follow US rules.... 1322# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf 1323# ... 1324# Province of Newfoundland and Labrador.... 1325# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm 1326# ... 1327# Yukon 1328# https://www.gov.yk.ca/legislation/regs/oic2006_127.pdf 1329# ... 1330# N.W.T. will follow US rules. Whoever maintains the government web site 1331# does not seem to believe in bookmarks. To see the news release, click the 1332# following link and search for "Daylight Savings Time Change". Press the 1333# "Daylight Savings Time Change" link; it will fire off a popup using 1334# JavaScript. 1335# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive 1336# ... 1337# Nunavut 1338# An amendment to the Interpretation Act was registered on February 19/2007.... 1339# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf 1340 1341# From Paul Eggert (2014-10-18): 1342# H. David Matthews and Mary Vincent's map 1343# "It's about TIME", _Canadian Geographic_ (September-October 1998) 1344# https://web.archive.org/web/19990827055050/https://canadiangeographic.ca/SO98/geomap.htm 1345# contains detailed boundaries for regions observing nonstandard 1346# time and daylight saving time arrangements in Canada circa 1998. 1347# 1348# National Research Council Canada maintains info about time zones and DST. 1349# https://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html 1350# https://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5 1351# Its unofficial information is often taken from Matthews and Vincent. 1352 1353# From Paul Eggert (2006-06-27): 1354# For now, assume all of DST-observing Canada will fall into line with the 1355# new US DST rules, 1356 1357# From Chris Walton (2011-12-01) 1358# In the first of Tammy Hardwick's articles 1359# http://www.ilovecreston.com/?p=articles&t=spec&ar=260 1360# she quotes the Friday November 1/1918 edition of the Creston Review. 1361# The quote includes these two statements: 1362# 'Sunday the CPR went back to the old system of time...' 1363# '... The daylight saving scheme was dropped all over Canada at the same time,' 1364# These statements refer to a transition from daylight time to standard time 1365# that occurred nationally on Sunday October 27/1918. This transition was 1366# also documented in the Saturday October 26/1918 edition of the Toronto Star. 1367 1368# In light of that evidence, we alter the date from the earlier believed 1369# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day 1370# than Thursday) in all Canadian rulesets. 1371 1372# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1373Rule Canada 1918 only - Apr 14 2:00 1:00 D 1374Rule Canada 1918 only - Oct 27 2:00 0 S 1375Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 1376Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 1377Rule Canada 1945 only - Sep 30 2:00 0 S 1378Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 1379Rule Canada 1974 2006 - Oct lastSun 2:00 0 S 1380Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D 1381Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D 1382Rule Canada 2007 max - Nov Sun>=1 2:00 0 S 1383 1384 1385# Newfoundland and Labrador 1386 1387# From Paul Eggert (2017-10-14): 1388# Legally Labrador should observe Newfoundland time; see: 1389# McLeod J. Labrador time - legal or not? St. John's Telegram, 2017-10-07 1390# http://www.thetelegram.com/news/local/labrador-time--legal-or-not-154860/ 1391# Matthews and Vincent (1998) write that the only part of Labrador 1392# that follows the rules is the southeast corner, including Port Hope 1393# Simpson and Mary's Harbour, but excluding, say, Black Tickle. 1394 1395# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1396Rule StJohns 1917 only - Apr 8 2:00 1:00 D 1397Rule StJohns 1917 only - Sep 17 2:00 0 S 1398# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger. 1399Rule StJohns 1919 only - May 5 23:00 1:00 D 1400Rule StJohns 1919 only - Aug 12 23:00 0 S 1401# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger. 1402Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 1403Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 1404# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks & 1405# Pottenger. 1406Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 1407Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 1408# Whitman gives the following transitions: 1409# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 1410# but go with Shanks & Pottenger and assume they used Canadian rules. 1411# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 1412# Apr 30 - Sep 24; go with Shanks & Pottenger. 1413Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 1414Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 1415Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 1416Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 1417Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 1418# From Paul Eggert (2000-10-02): 1419# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 1420# at 00:01 local time. For now, assume it started in 1987. 1421 1422# From Michael Pelley (2011-09-12): 1423# We received today, Monday, September 12, 2011, notification that the 1424# changes to the Newfoundland Standard Time Act have been proclaimed. 1425# The change in the Act stipulates that the change from Daylight Savings 1426# Time to Standard Time and from Standard Time to Daylight Savings Time 1427# now occurs at 2:00AM. 1428# ... 1429# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm 1430# ... 1431# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery 1432# Office of the Chief Information Officer 1433# Executive Council 1434# Government of Newfoundland & Labrador 1435 1436Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 1437Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S 1438Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 1439Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D 1440Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D 1441Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S 1442# 1443# St John's has an apostrophe, but POSIX file names can't have apostrophes. 1444# Zone NAME STDOFF RULES FORMAT [UNTIL] 1445Zone America/St_Johns -3:30:52 - LMT 1884 1446 -3:30:52 StJohns N%sT 1918 1447 -3:30:52 Canada N%sT 1919 1448 -3:30:52 StJohns N%sT 1935 Mar 30 1449 -3:30 StJohns N%sT 1942 May 11 1450 -3:30 Canada N%sT 1946 1451 -3:30 StJohns N%sT 2011 Nov 1452 -3:30 Canada N%sT 1453 1454# most of east Labrador 1455 1456# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'. 1457# Zone NAME STDOFF RULES FORMAT [UNTIL] 1458Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 1459 -3:30:52 - NST 1918 1460 -3:30:52 Canada N%sT 1919 1461 -3:30:52 - NST 1935 Mar 30 1462 -3:30 - NST 1936 1463 -3:30 StJohns N%sT 1942 May 11 1464 -3:30 Canada N%sT 1946 1465 -3:30 StJohns N%sT 1966 Mar 15 2:00 1466 -4:00 StJohns A%sT 2011 Nov 1467 -4:00 Canada A%sT 1468 1469 1470# west Labrador, Nova Scotia, Prince Edward I, 1471# Îles-de-la-Madeleine, Listuguj reserve 1472 1473# From Brian Inglis (2015-07-20): 1474# From the historical weather station records available at: 1475# https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada 1476# Sydney shares the same time history as Glace Bay, so was 1477# likely to be the same across the island.... 1478# Sydney, as the capital and most populous location, or Cape Breton, would 1479# have been better names for the zone had we known this in 1996. 1480 1481# From Paul Eggert (2015-07-20): 1482# Shanks & Pottenger write that since 1970 most of this region has been like 1483# Halifax. Many locales did not observe peacetime DST until 1972; 1484# the Cape Breton area, represented by Glace Bay, is the largest we know of 1485# (Glace Bay was perhaps not the best name choice but no point changing now). 1486# Shanks & Pottenger also write that Liverpool, NS was the only town 1487# in Canada to observe DST in 1971 but not 1970; for now we'll assume 1488# this is a typo. 1489 1490# From Jeffery Nichols (2020-01-09): 1491# America/Halifax ... also applies to Îles-de-la-Madeleine and the Listuguj 1492# reserve in Quebec. Officially, this came into effect on January 1, 2007 1493# (Legal Time Act, CQLR c T-5.1), but the legislative debates surrounding that 1494# bill say that it is "accommodating the customs and practices" of those 1495# regions, which suggests that they have always been in-line with Halifax. 1496 1497# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1498Rule Halifax 1916 only - Apr 1 0:00 1:00 D 1499Rule Halifax 1916 only - Oct 1 0:00 0 S 1500Rule Halifax 1920 only - May 9 0:00 1:00 D 1501Rule Halifax 1920 only - Aug 29 0:00 0 S 1502Rule Halifax 1921 only - May 6 0:00 1:00 D 1503Rule Halifax 1921 1922 - Sep 5 0:00 0 S 1504Rule Halifax 1922 only - Apr 30 0:00 1:00 D 1505Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 1506Rule Halifax 1923 only - Sep 4 0:00 0 S 1507Rule Halifax 1924 only - Sep 15 0:00 0 S 1508Rule Halifax 1925 only - Sep 28 0:00 0 S 1509Rule Halifax 1926 only - May 16 0:00 1:00 D 1510Rule Halifax 1926 only - Sep 13 0:00 0 S 1511Rule Halifax 1927 only - May 1 0:00 1:00 D 1512Rule Halifax 1927 only - Sep 26 0:00 0 S 1513Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 1514Rule Halifax 1928 only - Sep 9 0:00 0 S 1515Rule Halifax 1929 only - Sep 3 0:00 0 S 1516Rule Halifax 1930 only - Sep 15 0:00 0 S 1517Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 1518Rule Halifax 1932 only - May 1 0:00 1:00 D 1519Rule Halifax 1933 only - Apr 30 0:00 1:00 D 1520Rule Halifax 1933 only - Oct 2 0:00 0 S 1521Rule Halifax 1934 only - May 20 0:00 1:00 D 1522Rule Halifax 1934 only - Sep 16 0:00 0 S 1523Rule Halifax 1935 only - Jun 2 0:00 1:00 D 1524Rule Halifax 1935 only - Sep 30 0:00 0 S 1525Rule Halifax 1936 only - Jun 1 0:00 1:00 D 1526Rule Halifax 1936 only - Sep 14 0:00 0 S 1527Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 1528Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 1529Rule Halifax 1939 only - May 28 0:00 1:00 D 1530Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 1531Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 1532Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 1533Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 1534Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 1535Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 1536Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 1537Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 1538Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 1539# Zone NAME STDOFF RULES FORMAT [UNTIL] 1540Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 1541 -4:00 Halifax A%sT 1918 1542 -4:00 Canada A%sT 1919 1543 -4:00 Halifax A%sT 1942 Feb 9 2:00s 1544 -4:00 Canada A%sT 1946 1545 -4:00 Halifax A%sT 1974 1546 -4:00 Canada A%sT 1547Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 1548 -4:00 Canada A%sT 1953 1549 -4:00 Halifax A%sT 1954 1550 -4:00 - AST 1972 1551 -4:00 Halifax A%sT 1974 1552 -4:00 Canada A%sT 1553 1554# New Brunswick 1555 1556# From Paul Eggert (2007-01-31): 1557# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf> 1558# says they changed at 00:01 through 2006, and 1559# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it 1560# clear that this was the case since at least 1993. 1561# For now, assume it started in 1993. 1562 1563# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1564Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D 1565Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S 1566Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D 1567Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S 1568Rule Moncton 1939 only - May 27 1:00 1:00 D 1569Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S 1570Rule Moncton 1940 only - May 19 1:00 1:00 D 1571Rule Moncton 1941 only - May 4 1:00 1:00 D 1572Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D 1573Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S 1574Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S 1575Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D 1576Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S 1577# Zone NAME STDOFF RULES FORMAT [UNTIL] 1578Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 1579 -5:00 - EST 1902 Jun 15 1580 -4:00 Canada A%sT 1933 1581 -4:00 Moncton A%sT 1942 1582 -4:00 Canada A%sT 1946 1583 -4:00 Moncton A%sT 1973 1584 -4:00 Canada A%sT 1993 1585 -4:00 Moncton A%sT 2007 1586 -4:00 Canada A%sT 1587 1588# Quebec 1589 1590# From Paul Eggert (2020-01-10): 1591# See America/Toronto for most of Quebec, including Montreal. 1592# See America/Halifax for the Îles de la Madeleine and the Listuguj reserve. 1593# See America/Puerto_Rico for east of Natashquan. 1594 1595# Ontario 1596 1597# From Mark Brader (2003-07-26): 1598# [According to the Toronto Star] Orillia, Ontario, adopted DST 1599# effective Saturday, 1912-06-22, 22:00; the article mentions that 1600# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 1601# have already done so. In Orillia DST was to run until Saturday, 1602# 1912-08-31 (no time mentioned), but it was met with considerable 1603# hostility from certain segments of the public, and was revoked after 1604# only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but 1605# presumably that should be -07-06. (1912-06-19, -07-12; also letters 1606# earlier in June). 1607# 1608# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 1609# 1610# From Paul Eggert (2017-07-08): 1611# For more on Orillia, see: Daubs K. Bold attempt at daylight saving 1612# time became a comic failure in Orillia. Toronto Star 2017-07-08. 1613# https://www.thestar.com/news/insight/2017/07/08/bold-attempt-at-daylight-saving-time-became-a-comic-failure-in-orillia.html 1614 1615# From Mark Brader (2010-03-06): 1616# 1617# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom 1618# right corner of page 1, it says that Toronto will return to standard 1619# time at 2 am Sunday morning (which agrees with the database), and that: 1620# 1621# The one-hour setback will go into effect throughout most of Ontario, 1622# except in areas like Windsor which remains on standard time all year. 1623# 1624# ... I don't know if Windsor began observing DST when Detroit did, 1625# or in 1974, or on some other date. 1626# 1627# By the way, the article continues by noting that: 1628# 1629# Some cities in the United States have pushed the deadline back 1630# three weeks and will change over from daylight saving in October. 1631 1632# From Chris Walton (2024-01-09): 1633# The [Toronto] changes in 1947, 1948, and 1949 took place at 2:00 a.m. local 1634# time instead of midnight.... Toronto Daily Star - ... 1635# April 2, 1947 - Page 39 ... April 7, 1948 - Page 13 ... 1636# April 2, 1949 - Page 1 ... April 7, 1949 - Page 24 ... 1637# November 25, 1949 - Page 52 ... April 21, 1950 - Page 14 ... 1638# September 19, 1950 - Page 46 ... September 20, 1950 - Page 3 ... 1639# November 24, 1950 - Page 21 1640 1641# From Arthur David Olson (2010-07-17): 1642# 1643# "Standard Time and Time Zones in Canada" appeared in 1644# The Journal of The Royal Astronomical Society of Canada, 1645# volume 26, number 2 (February 1932) and, as of 2010-07-17, 1646# was available at 1647# http://adsabs.harvard.edu/full/1932JRASC..26...49S 1648# 1649# It includes the text below (starting on page 57): 1650# 1651# A list of the places in Canada using daylight saving time would 1652# require yearly revision. From information kindly furnished by 1653# the provincial governments and by the postmasters in many cities 1654# and towns, it is found that the following places used daylight sav- 1655# ing in 1930. The information for the province of Quebec is definite, 1656# for the other provinces only approximate: 1657# 1658# Province Daylight saving time used 1659# Prince Edward Island Not used. 1660# Nova Scotia In Halifax only. 1661# New Brunswick In St. John only. 1662# Quebec In the following places: 1663# Montreal Lachine 1664# Quebec Mont-Royal 1665# Lévis Iberville 1666# St. Lambert Cap de la Madelèine 1667# Verdun Loretteville 1668# Westmount Richmond 1669# Outremont St. Jérôme 1670# Longueuil Greenfield Park 1671# Arvida Waterloo 1672# Chambly-Canton Beaulieu 1673# Melbourne La Tuque 1674# St. Théophile Buckingham 1675# Ontario Used generally in the cities and towns along 1676# the southerly part of the province. Not 1677# used in the northwesterly part. 1678# Manitoba Not used. 1679# Saskatchewan In Regina only. 1680# Alberta Not used. 1681# British Columbia Not used. 1682# 1683# With some exceptions, the use of daylight saving may be said to be limited 1684# to those cities and towns lying between Quebec city and Windsor, Ont. 1685 1686# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1687Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1688Rule Toronto 1919 only - Oct 26 0:00 0 S 1689Rule Toronto 1920 only - May 2 2:00 1:00 D 1690Rule Toronto 1920 only - Sep 26 0:00 0 S 1691Rule Toronto 1921 only - May 15 2:00 1:00 D 1692Rule Toronto 1921 only - Sep 15 2:00 0 S 1693Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1694# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16" 1695# was meant. 1696Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1697Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1698Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1699Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1700Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1701Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1702Rule Toronto 1945 1948 - Sep lastSun 2:00 0 S 1703Rule Toronto 1946 1973 - Apr lastSun 2:00 1:00 D 1704Rule Toronto 1949 1950 - Nov lastSun 2:00 0 S 1705Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1706# Shanks & Pottenger say Toronto ended DST a week early in 1971, 1707# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this 1708# is wrong, and that he had confirmed it by checking the 1971-10-30 1709# Toronto Star, which said that DST was ending 1971-10-31 as usual. 1710Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1711 1712# The Bahamas match Toronto since 1970. 1713 1714# Zone NAME STDOFF RULES FORMAT [UNTIL] 1715Zone America/Toronto -5:17:32 - LMT 1895 1716 -5:00 Canada E%sT 1919 1717 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1718 -5:00 Canada E%sT 1946 1719 -5:00 Toronto E%sT 1974 1720 -5:00 Canada E%sT 1721# For Atikokan see America/Panama. 1722 1723 1724# Manitoba 1725 1726# From Rob Douglas (2006-04-06): 1727# the old Manitoba Time Act - as amended by Bill 2, assented to 1728# March 27, 1987 ... said ... 1729# "between two o'clock Central Standard Time in the morning of 1730# the first Sunday of April of each year and two o'clock Central 1731# Standard Time in the morning of the last Sunday of October next 1732# following, one hour in advance of Central Standard Time."... 1733# I believe that the English legislation [of the old time act] had 1734# been assented to (March 22, 1967).... 1735# Also, as far as I can tell, there was no order-in-council varying 1736# the time of Daylight Saving Time for 2005 and so the provisions of 1737# the 1987 version would apply - the changeover was at 2:00 Central 1738# Standard Time (i.e. not until 3:00 Central Daylight Time). 1739 1740# From Paul Eggert (2006-04-10): 1741# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s) 1742# starting 1966. Since 02:00s is clearly correct for 1967 on, assume 1743# it was also 02:00s in 1966. 1744 1745# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1746Rule Winn 1916 only - Apr 23 0:00 1:00 D 1747Rule Winn 1916 only - Sep 17 0:00 0 S 1748Rule Winn 1918 only - Apr 14 2:00 1:00 D 1749Rule Winn 1918 only - Oct 27 2:00 0 S 1750Rule Winn 1937 only - May 16 2:00 1:00 D 1751Rule Winn 1937 only - Sep 26 2:00 0 S 1752Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1753Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1754Rule Winn 1945 only - Sep lastSun 2:00 0 S 1755Rule Winn 1946 only - May 12 2:00 1:00 D 1756Rule Winn 1946 only - Oct 13 2:00 0 S 1757Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1758Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1759Rule Winn 1950 only - May 1 2:00 1:00 D 1760Rule Winn 1950 only - Sep 30 2:00 0 S 1761Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1762Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1763Rule Winn 1959 only - Oct lastSun 2:00 0 S 1764Rule Winn 1960 only - Sep lastSun 2:00 0 S 1765Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1766Rule Winn 1963 only - Sep 22 2:00 0 S 1767Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D 1768Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S 1769Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D 1770# Zone NAME STDOFF RULES FORMAT [UNTIL] 1771Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1772 -6:00 Winn C%sT 2006 1773 -6:00 Canada C%sT 1774 1775 1776# Saskatchewan 1777 1778# From Mark Brader (2003-07-26): 1779# The first actual adoption of DST in Canada was at the municipal 1780# level. As the [Toronto] Star put it (1912-06-07), "While people 1781# elsewhere have long been talking of legislation to save daylight, 1782# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1783# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1784# presumably late evening, as below), and would run until "the end of 1785# the summer". The discrepancy between municipal time and railroad 1786# time was noted. 1787 1788# From Paul Eggert (2003-07-27): 1789# Willett (1914-03) notes that DST "has been in operation ... in the 1790# City of Moose Jaw, Saskatchewan, for one year." 1791 1792# From Paul Eggert (2019-07-25): 1793# Pearce's book says Regina observed DST in 1914-1917. No dates and times, 1794# unfortunately. It also says that in 1914 Saskatoon observed DST 1795# from 1 June to 6 July, and that DST was also tried out in Davidson, 1796# Melfort, and Prince Albert. 1797 1798# From Paul Eggert (2006-03-22): 1799# Shanks & Pottenger say that since 1970 this region has mostly been as Regina. 1800# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1801# Other western towns (e.g. Lloydminster) are like Edmonton. 1802# Matthews and Vincent (1998) write that Denare Beach and Creighton 1803# are like Winnipeg, in violation of Saskatchewan law. 1804 1805# From W. Jones (1992-11-06): 1806# The. . .below is based on information I got from our law library, the 1807# provincial archives, and the provincial Community Services department. 1808# A precise history would require digging through newspaper archives, and 1809# since you didn't say what you wanted, I didn't bother. 1810# 1811# Saskatchewan is split by a time zone meridian (105W) and over the years 1812# the boundary became pretty ragged as communities near it reevaluated 1813# their affiliations in one direction or the other. In 1965 a provincial 1814# referendum favoured legislating common time practices. 1815# 1816# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1817# Saskatchewan 1978) was proclaimed, and established that the eastern 1818# part of Saskatchewan would use CST year round, that districts in 1819# northwest Saskatchewan would by default follow CST but could opt to 1820# follow Mountain Time rules (thus 1 hour difference in the winter and 1821# zero in the summer), and that districts in southwest Saskatchewan would 1822# by default follow MT but could opt to follow CST. 1823# 1824# It took a few years for the dust to settle (I know one story of a town 1825# on one time zone having its school in another, such that a mom had to 1826# serve her family lunch in two shifts), but presently it seems that only 1827# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1828# rules any more; all other districts appear to have used CST year round 1829# since sometime in the 1960s. 1830 1831# From Chris Walton (2006-06-26): 1832# The Saskatchewan time act which was last updated in 1996 is about 30 pages 1833# long and rather painful to read. 1834# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf 1835 1836# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1837Rule Regina 1918 only - Apr 14 2:00 1:00 D 1838Rule Regina 1918 only - Oct 27 2:00 0 S 1839Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1840Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1841Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1842Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1843Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1844Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1845Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1846Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1847Rule Regina 1945 only - Sep lastSun 2:00 0 S 1848Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1849Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1850Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1851Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1852Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1853Rule Regina 1959 only - Oct lastSun 2:00 0 S 1854# 1855Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1856Rule Swift 1957 only - Oct lastSun 2:00 0 S 1857Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1858Rule Swift 1959 only - Oct lastSun 2:00 0 S 1859Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1860# Zone NAME STDOFF RULES FORMAT [UNTIL] 1861Zone America/Regina -6:58:36 - LMT 1905 Sep 1862 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1863 -6:00 - CST 1864Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1865 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1866 -7:00 Regina M%sT 1950 1867 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1868 -6:00 - CST 1869 1870 1871# Alberta 1872 1873# From Alois Treindl (2019-07-19): 1874# There was no DST in Alberta in 1967... Calgary Herald, 29 April 1967. 1875# 1969, no DST, from Edmonton Journal 18 April 1969 1876# 1877# From Paul Eggert (2019-07-25): 1878# Pearce's book says that Alberta's 1948 Daylight Saving Act required 1879# Mountain Standard Time without DST, and that "anyone who broke that law 1880# could be fined up to $25 and costs". There seems to be no record of 1881# anybody paying the fine. The law was not changed until an August 1971 1882# plebiscite reinstituted DST in 1972. This story is also mentioned in: 1883# Boyer JP. Forcing Choice: The Risky Reward of Referendums. Dundum. 2017. 1884# ISBN 978-1459739123. 1885 1886# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1887Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1888Rule Edm 1918 only - Oct 27 2:00 0 S 1889Rule Edm 1919 only - May 27 2:00 0 S 1890Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1891Rule Edm 1920 only - Oct lastSun 2:00 0 S 1892Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1893Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1894Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1895Rule Edm 1945 only - Sep lastSun 2:00 0 S 1896Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1897Rule Edm 1947 only - Sep lastSun 2:00 0 S 1898Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1899Rule Edm 1972 2006 - Oct lastSun 2:00 0 S 1900# Zone NAME STDOFF RULES FORMAT [UNTIL] 1901Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1902 -7:00 Edm M%sT 1987 1903 -7:00 Canada M%sT 1904 1905 1906# British Columbia 1907 1908# From Paul Eggert (2006-03-22): 1909# Shanks & Pottenger write that since 1970 most of this region has 1910# been like Vancouver. 1911# Dawson Creek uses MST. Much of east BC is like Edmonton. 1912 1913# From Matt Johnson (2015-09-21): 1914# Fort Nelson, BC, Canada will cancel DST this year. So while previously they 1915# were aligned with America/Vancouver, they're now aligned with 1916# America/Dawson_Creek. 1917# http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html 1918# 1919# From Tim Parenti (2015-09-23): 1920# This requires a new zone for the Northern Rockies Regional Municipality, 1921# America/Fort_Nelson. The resolution of 2014-12-08 was reached following a 1922# 2014-11-15 poll with nearly 75% support. Effectively, the municipality has 1923# been on MST (-0700) like Dawson Creek since it advanced its clocks on 1924# 2015-03-08. 1925# 1926# From Paul Eggert (2019-07-25): 1927# Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver. 1928# Alois Treindl confirmed this on 07-22, citing the 1946-04-27 Vancouver Daily 1929# Province. He also cited the 1946-09-28 Victoria Daily Times, which said 1930# that Vancouver, Victoria, etc. "change at midnight Saturday"; for now, 1931# guess they meant 02:00 Sunday since 02:00 was common practice in Vancouver. 1932# 1933# Early Vancouver, Volume Four, by Major J.S. Matthews, V.D., 2011 edition 1934# says that a 1922 plebiscite adopted DST, but a 1923 plebiscite rejected it. 1935# http://former.vancouver.ca/ctyclerk/archives/digitized/EarlyVan/SearchEarlyVan/Vol4pdf/MatthewsEarlyVancouverVol4_DaylightSavings.pdf 1936# A catalog entry for a newspaper clipping seems to indicate that Vancouver 1937# observed DST in 1941 from 07-07 through 09-27; see 1938# https://searcharchives.vancouver.ca/daylight-saving-1918-starts-again-july-7-1941-start-d-s-sept-27-end-of-d-s-1941 1939# We have no further details, so omit them for now. 1940 1941# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1942Rule Vanc 1918 only - Apr 14 2:00 1:00 D 1943Rule Vanc 1918 only - Oct 27 2:00 0 S 1944Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 1945Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 1946Rule Vanc 1945 only - Sep 30 2:00 0 S 1947Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 1948Rule Vanc 1946 only - Sep 29 2:00 0 S 1949Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 1950Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S 1951# Zone NAME STDOFF RULES FORMAT [UNTIL] 1952Zone America/Vancouver -8:12:28 - LMT 1884 1953 -8:00 Vanc P%sT 1987 1954 -8:00 Canada P%sT 1955Zone America/Dawson_Creek -8:00:56 - LMT 1884 1956 -8:00 Canada P%sT 1947 1957 -8:00 Vanc P%sT 1972 Aug 30 2:00 1958 -7:00 - MST 1959Zone America/Fort_Nelson -8:10:47 - LMT 1884 1960 -8:00 Vanc P%sT 1946 1961 -8:00 - PST 1947 1962 -8:00 Vanc P%sT 1987 1963 -8:00 Canada P%sT 2015 Mar 8 2:00 1964 -7:00 - MST 1965# For Creston see America/Phoenix. 1966 1967# Northwest Territories, Nunavut, Yukon 1968 1969# From Chris Walton (2022-11-06): 1970# Whitehorse Star - Thursday April 22, 1965 - page 1 1971# title: DST Starts Monday ... 1972# https://www.newspapers.com/image/578587481/ 1973# The title of this first article is wrong and/or misleading. 1974# Also, the start time shown in the article is vague; it simply says "after 1975# midnight" when it probably should have stated 2:00a.m.... 1976# 1977# Whitehorse Star - Monday October 25, 1965 - page 15 ... 1978# https://www.newspapers.com/image/578589147/ 1979# The 1965 Yukon Council minutes can be found here: 1980# http://assets.yukonarchives.ca/PER_YG_06_1965_C20_S02_v1.pdf 1981# ... I do not currently believe that NWT touched any of its clocks in 1965.... 1982# 1983# Whitehorse Star - Thursday Feb 24,1966 - page 2 1984# title: It's Time for YDT ... 1985# https://www.newspapers.com/image/578575979/ ... 1986# America/Whitehorse as a permanent change from UTC-9(YST) to 1987# UTC-8(PST) at 00:00 on Sunday February 27, 1966.... 1988# 1989# Whitehorse Star - Friday April 28,1972 - page 6 1990# title: Daylight Saving Time for N.W.T.... 1991# https://www.newspapers.com/image/578701610/ ... 1992# Nunavut and NWT zones ... DST starting in 1972.... Start and End ... 1993# should be the same as the rest of Canada 1994# 1995# 1996# From Paul Eggert (2022-11-06): 1997# For now, assume Yukon's 1965-04-22 spring forward was 00:00 -> 02:00, as this 1998# seems likely than 02:00 -> 04:00 and matches "after midnight". 1999 2000# From Paul Eggert (2006-03-22): 2001# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 2002# Mathew Englander (1996-10-07) gives the following refs: 2003# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 2004# c. 7 defines Yukon standard time as UTC-9.... 2005# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 2006# [https://www.canlii.org/en/ca/laws/stat/rsc-1985-c-i-21/latest/rsc-1985-c-i-21.html] 2007# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 2008# * O.I.C. 1980/02 established DST. 2009# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 2010 2011# From Brian Inglis (2015-04-14): 2012# 2013# I tried to trace the history of Yukon time and found the following 2014# regulations, giving the reference title and URL if found, regulation name, 2015# and relevant quote if available. Each regulation specifically revokes its 2016# predecessor. The final reference is to the current Interpretation Act 2017# authorizing and resulting from these regulatory changes. 2018# 2019# Only recent regulations were retrievable via Yukon government site search or 2020# index, and only some via Canadian legal sources. Other sources used include 2021# articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS 2022# Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and 2023# 1970 quoted below; each article includes current extracts from provincial 2024# and territorial ST and DST regulations at the end, summaries and details of 2025# standard times and daylight saving time at many locations across Canada, 2026# with time zone maps, tables and calculations for Canadian Sunrise, Sunset, 2027# and LMST; they also cover many countries and global locations, with a chart 2028# and table showing current Universal Time offsets, and may be useful as 2029# another source of information for 1970 and earlier. 2030# 2031# * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26, 2032# pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS) 2033# http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75: 2034# Yukon Interpretation Ordinance 2035# Yukon standard time is the local mean time at the one hundred and 2036# thirty-fifth meridian. 2037# 2038# * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.; 2039# JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System 2040# (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1: 2041# Yukon Interpretation Ordinance, 1955, Chap. 16. 2042# 2043# (1) Subject to this section, standard time shall be reckoned as nine 2044# hours behind Greenwich Time and called Yukon Standard Time. 2045# 2046# (2) Notwithstanding subsection (1), the Commissioner may make regulations 2047# varying the manner of reckoning standard time. 2048# 2049# * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance 2050# [no online source found] 2051# 2052# * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC, 2053# Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS) 2054# http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon 2055# Territory Commissioner's Order 1967-59 Interpretation Ordinance ... 2056# 2057# 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon 2058# Territory on 27th January, 1966, is hereby revoked. 2059# 2060# 2. Yukon (East) Standard Time as defined by section 36 of the 2061# Interpretation Ordinance from and after mid-night on the 28th day of May, 2062# 1967 shall be reckoned in the same manner as Pacific Standard Time, that 2063# is to say, eight hours behind Greenwich Time in the area of the Yukon 2064# Territory lying east of the 138th degree longitude west. 2065# 2066# 3. In the remainder of the Territory, lying west of the 138th degree 2067# longitude west, Yukon (West) Standard Time shall be reckoned as nine 2068# hours behind Greenwich Time. 2069# 2070# * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214 2071# https://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html 2072# C.O. 1973/214 INTERPRETATION ACT ... 2073# 2074# 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby 2075# revoked. 2076# 2077# 2. Yukon Standard Time as defined by section 36 of the Interpretation 2078# Act from and after midnight on the twenty-eighth day of October, 1973 2079# shall be reckoned in the same manner as Pacific Standard Time, that is 2080# to say eight hours behind Greenwich Time. 2081# 2082# * O.I.C. 1980/02 INTERPRETATION ACT 2083# https://mm.icann.org/pipermail/tz/attachments/20201125/d5adc93b/CAYTOIC1980-02DST1980-01-04-0001.pdf 2084# 2085# * Yukon Daylight Saving Time, YOIC 1987/56 2086# https://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html 2087# O.I.C. 1987/056 INTERPRETATION ACT ... 2088# 2089# In every year between 2090# (a) two o'clock in the morning in the first Sunday in April, and 2091# (b) two o'clock in the morning in the last Sunday in October, 2092# Standard Time shall be reckoned as seven hours behind Greenwich Time and 2093# called Yukon Daylight Saving Time. 2094# ... 2095# Dated ... 9th day of March, A.D., 1987. 2096# 2097# * Yukon Daylight Saving Time 2006, YOIC 2006/127 2098# https://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html 2099# O.I.C. 2006/127 INTERPRETATION ACT ... 2100# 2101# 1. In Yukon each year the time for general purposes shall be 7 hours 2102# behind Greenwich mean time during the period commencing at two o'clock 2103# in the forenoon on the second Sunday of March and ending at two o'clock 2104# in the forenoon on the first Sunday of November and shall be called 2105# Yukon Daylight Saving Time. 2106# 2107# 2. Order-in-Council 1987/56 is revoked. 2108# 2109# 3. This order comes into force January 1, 2007. 2110# 2111# * Interpretation Act, RSY 2002, c 125 2112# https://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html 2113 2114# From Chris Walton (2022-11-06): 2115# The 5th edition of the Atlas of Canada contains a time zone map that 2116# shows both legislated and observed time zone boundaries. 2117# All communities on Baffin Island are shown to be observing Eastern time. 2118# The date on the map is 1984. 2119# https://ftp.maps.canada.ca/pub/nrcan_rncan/raster/atlas_5_ed/eng/other/referencemaps/mcr4056.pdf 2120 2121# From Rives McDow (1999-09-04): 2122# Nunavut ... moved ... to incorporate the whole territory into one time zone. 2123# Nunavut moves to single time zone Oct. 31 2124# http://www.nunatsiaq.com/nunavut/nvt90903_13.html 2125 2126# From Paul Eggert (1999-09-20): 2127# Basic Facts: The New Territory 2128# http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html 2129# (1999) reports that ... Coral Harbour does not observe DST. 2130 2131# From Paul Eggert (2000-10-02): 2132# Matthews and Vincent (1998) say the following, but we lack histories 2133# for these potential new Zones. 2134# 2135# The Canadian Forces station at Alert uses Eastern Time while the 2136# handful of residents at the Eureka weather station [in the Central 2137# zone] skip daylight savings. Baffin Island, which is crossed by the 2138# Central, Eastern and Atlantic Time zones only uses Eastern Time. 2139# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 2140# Central Time and Southampton Island [in the Central zone] is not 2141# required to use daylight savings. 2142 2143# From <http://www.nunatsiaqonline.ca/archives/nunavut001130/nvt21110_02.html> 2144# Nunavut now has two time zones (2000-11-10): 2145# The Nunavut government would allow its employees in Kugluktuk and 2146# Cambridge Bay to operate on central time year-round, putting them 2147# one hour behind the rest of Nunavut for six months during the winter. 2148# At the end of October the two communities had rebelled against 2149# Nunavut's unified time zone, refusing to shift to eastern time with 2150# the rest of the territory for the winter. Cambridge Bay remained on 2151# central time, while Kugluktuk, even farther west, reverted to 2152# mountain time, which they had used before the advent of Nunavut's 2153# unified time zone in 1999. 2154# 2155# From Rives McDow (2001-01-20), quoting the Nunavut government: 2156# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 2157 2158# From Paul Eggert (2000-12-04): 2159# Let's just keep track of the official times for now. 2160 2161# From Rives McDow (2001-03-07): 2162# The premier of Nunavut has issued a ministerial statement advising 2163# that effective 2001-04-01, the territory of Nunavut will revert 2164# back to three time zones (mountain, central, and eastern). Of the 2165# cities in Nunavut, Coral Harbor is the only one that I know of that 2166# has said it will not observe dst, staying on EST year round. I'm 2167# checking for more info, and will get back to you if I come up with 2168# more. 2169# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 2170 2171# From Gwillim Law (2005-05-21): 2172# According to ... 2173# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 2174# (from a 1998 Canadian Geographic article), the de facto and de jure time 2175# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 2176# round. Using Google, it's easy to find other websites that confirm this. 2177# I wasn't able to find how far back this time regimen goes, but since it 2178# predates the creation of Nunavut, it probably goes back many years.... 2179# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 2180# 2181# From Paul Eggert (2014-10-17): 2182# For lack of better information, assume that Southampton Island observed 2183# daylight saving only during wartime. Gwillim Law's email also 2184# mentioned maps now maintained by National Research Council Canada; 2185# see above for an up-to-date link. 2186 2187# From Chris Walton (2007-03-01): 2188# ... the community of Resolute (located on Cornwallis Island in 2189# Nunavut) moved from Central Time to Eastern Time last November. 2190# Basically the community did not change its clocks at the end of 2191# daylight saving.... 2192# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html 2193 2194# From Chris Walton (2011-03-21): 2195# Back in 2007 I initiated the creation of a new "zone file" for Resolute 2196# Bay. Resolute Bay is a small community located about 900km north of 2197# the Arctic Circle. The zone file was required because Resolute Bay had 2198# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007. 2199# 2200# According to new information which I received last week, Resolute Bay 2201# went back to using UTC-6 in the winter of 2007-2008... 2202# 2203# On March 11/2007 most of Canada went onto daylight saving. On March 2204# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I 2205# talked to somebody that was both knowledgeable and helpful. I was able 2206# to confirm that Resolute Bay was still operating on UTC-5. It was 2207# explained to me that Resolute Bay had been on the Eastern Time zone 2208# (EST) in the winter, and was now back on the Central Time zone (CDT). 2209# i.e. the time zone had changed twice in the last year but the clocks 2210# had not moved. The residents had to know which time zone they were in 2211# so they could follow the correct TV schedule... 2212# 2213# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I 2214# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature 2215# of the phone call, I decided to seek out an alternate source of 2216# information. I found an e-mail address for somebody by the name of 2217# Stephanie Adams whose job was listed as "Inns North Support Officer for 2218# Arctic Co-operatives." I was under the impression that Stephanie lived 2219# and worked in Resolute Bay... 2220# 2221# On March 14/2011 I phoned the hamlet office again. I was told that 2222# Resolute Bay had been using Central Standard Time over the winter of 2223# 2010-2011 and that the clocks had therefore been moved one hour ahead 2224# on March 13/2011. The person I talked to was aware that Resolute Bay 2225# had previously experimented with Eastern Standard Time but he could not 2226# tell me when the practice had stopped. 2227# 2228# On March 17/2011 I searched the Web to find an e-mail address of 2229# somebody that might be able to tell me exactly when Resolute Bay went 2230# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz 2231# used to be the mayor of Resolute Bay and he apparently owns half the 2232# businesses including "South Camp Inn." This website has some info on 2233# Aziz: 2234# http://www.uphere.ca/node/493 2235# 2236# I sent Aziz an e-mail asking when Resolute Bay had stopped using 2237# Eastern Standard Time. 2238# 2239# Aziz responded quickly with this: "hi, The time was not changed for the 2240# 1 year only, the following year, the community went back to the old way 2241# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in 2242# the winter Zulu plus 6 hrs" 2243# 2244# This of course conflicted with everything I had ascertained in November 2008. 2245# 2246# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz 2247# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You 2248# may want to check with the weather office in Resolute Bay or do a 2249# search on the weather through Env. Canada. web site" 2250# 2251# If I had realized the Stephanie did not live in Resolute Bay I would 2252# never have contacted her. I now believe that all the information I 2253# obtained in November 2008 should be ignored... 2254# I apologize for reporting incorrect information in 2008. 2255 2256# From Tim Parenti (2020-03-05): 2257# The government of Yukon announced [yesterday] the cessation of seasonal time 2258# changes. "After clocks are pushed ahead one hour on March 8, the territory 2259# will remain on [UTC-07]. ... [The government] found 93 per cent of 2260# respondents wanted to end seasonal time changes and, of that group, 70 per 2261# cent wanted 'permanent Pacific Daylight Saving Time.'" 2262# https://www.cbc.ca/news/canada/north/yukon-end-daylight-saving-time-1.5486358 2263# 2264# Although the government press release prefers PDT, we prefer MST for 2265# consistency with nearby Dawson Creek, Creston, and Fort Nelson. 2266# https://yukon.ca/en/news/yukon-end-seasonal-time-change 2267 2268# From Andrew G. Smith (2020-09-24): 2269# Yukon has completed its regulatory change to be on UTC -7 year-round.... 2270# http://www.gov.yk.ca/legislation/regs/oic2020_125.pdf 2271# What we have done is re-defined Yukon Standard Time, as we are 2272# authorized to do under section 33 of our Interpretation Act: 2273# http://www.gov.yk.ca/legislation/acts/interpretation_c.pdf 2274# 2275# From Paul Eggert (2020-09-24): 2276# tzdb uses the obsolete YST abbreviation for standard time in Yukon through 2277# about 1970, and uses PST for standard time in Yukon since then. Consistent 2278# with that, use MST for -07, the new standard time in Yukon effective Nov. 1. 2279 2280# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 2281Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 2282Rule NT_YK 1918 only - Oct 27 2:00 0 S 2283Rule NT_YK 1919 only - May 25 2:00 1:00 D 2284Rule NT_YK 1919 only - Nov 1 0:00 0 S 2285Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 2286Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 2287Rule NT_YK 1945 only - Sep 30 2:00 0 S 2288Rule NT_YK 1972 1986 - Apr lastSun 2:00 1:00 D 2289Rule NT_YK 1972 2006 - Oct lastSun 2:00 0 S 2290Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D 2291Rule Yukon 1965 only - Apr lastSun 0:00 2:00 DD 2292Rule Yukon 1965 only - Oct lastSun 2:00 0 S 2293# Zone NAME STDOFF RULES FORMAT [UNTIL] 2294# formerly Frobisher Bay 2295Zone America/Iqaluit 0 - -00 1942 Aug # Frobisher Bay est. 2296 -5:00 NT_YK E%sT 1999 Oct 31 2:00 2297 -6:00 Canada C%sT 2000 Oct 29 2:00 2298 -5:00 Canada E%sT 2299# aka Qausuittuq 2300Zone America/Resolute 0 - -00 1947 Aug 31 # Resolute founded 2301 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2302 -5:00 - EST 2001 Apr 1 3:00 2303 -6:00 Canada C%sT 2006 Oct 29 2:00 2304 -5:00 - EST 2007 Mar 11 3:00 2305 -6:00 Canada C%sT 2306# aka Kangiqiniq 2307Zone America/Rankin_Inlet 0 - -00 1957 # Rankin Inlet founded 2308 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2309 -5:00 - EST 2001 Apr 1 3:00 2310 -6:00 Canada C%sT 2311# aka Iqaluktuuttiaq 2312Zone America/Cambridge_Bay 0 - -00 1920 # trading post est.? 2313 -7:00 NT_YK M%sT 1999 Oct 31 2:00 2314 -6:00 Canada C%sT 2000 Oct 29 2:00 2315 -5:00 - EST 2000 Nov 5 0:00 2316 -6:00 - CST 2001 Apr 1 3:00 2317 -7:00 Canada M%sT 2318Zone America/Inuvik 0 - -00 1953 # Inuvik founded 2319 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 2320 -7:00 NT_YK M%sT 1980 2321 -7:00 Canada M%sT 2322Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 2323 -9:00 NT_YK Y%sT 1965 2324 -9:00 Yukon Y%sT 1966 Feb 27 0:00 2325 -8:00 - PST 1980 2326 -8:00 Canada P%sT 2020 Nov 1 2327 -7:00 - MST 2328Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 2329 -9:00 NT_YK Y%sT 1965 2330 -9:00 Yukon Y%sT 1973 Oct 28 0:00 2331 -8:00 - PST 1980 2332 -8:00 Canada P%sT 2020 Nov 1 2333 -7:00 - MST 2334 2335 2336############################################################################### 2337 2338# Mexico 2339 2340# From Paul Eggert (2014-12-07): 2341# The Investigation and Analysis Service of the 2342# Mexican Library of Congress (MLoC) has published a 2343# history of Mexican local time (in Spanish) 2344# http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm 2345# 2346# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC. 2347# (In all cases we go with the MLoC.) 2348# S&P report that Baja was at -8:00 in 1922/1923. 2349# S&P say the 1930 transition in Baja was 1930-11-16. 2350# S&P report no DST during summer 1931. 2351# S&P report a transition at 1932-03-30 23:00, not 1932-04-01. 2352 2353# From Gwillim Law (2001-02-20): 2354# There are some other discrepancies between the Decrees page and the 2355# tz database. I think they can best be explained by supposing that 2356# the researchers who prepared the Decrees page failed to find some of 2357# the relevant documents. 2358 2359# From Heitor David Pinto (2024-08-04): 2360# In 1931, the decree implementing DST specified that it would take 2361# effect on 30 April.... 2362# https://www.dof.gob.mx/nota_to_imagen_fs.php?cod_diario=192270&pagina=2&seccion=1 2363# 2364# In 1981, the decree changing Campeche, Yucatán and Quintana Roo to UTC-5 2365# specified that it would enter into force on 26 December 1981 at 2:00.... 2366# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4705667&fecha=23/12/1981&cod_diario=202796 2367# 2368# In 1982, the decree returning Campeche and Yucatán to UTC-6 specified that 2369# it would enter into force on 2 November 1982 at 2:00.... 2370# https://www.dof.gob.mx/nota_to_imagen_fs.php?cod_diario=205689&pagina=3&seccion=0 2371# 2372# Quintana Roo changed to UTC-6 on 4 January 1983 at 0:00, and again 2373# to UTC-5 on 26 October 1997 at 2:00.... 2374# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4787355&fecha=28/12/1982&cod_diario=206112 2375# https://www.dof.gob.mx/nota_to_imagen_fs.php?cod_diario=209559&pagina=15&seccion=0 2376# 2377# Durango, Coahuila, Nuevo León and Tamaulipas were set to UTC-7 on 1 January 2378# 1922, and changed to UTC-6 on 10 June 1927. Then Durango, Coahuila and 2379# Nuevo León (but not Tamaulipas) returned to UTC-7 on 15 November 1930, 2380# observed DST in 1931, and changed again to UTC-6 on 1 April 1932.... 2381# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4441846&fecha=29/12/1921&cod_diario=187468 2382# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4541520&fecha=09/06/1927&cod_diario=193920 2383# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4491963&fecha=15/11/1930&cod_diario=190835 2384# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4418437&fecha=21/01/1932&cod_diario=185588 2385# 2386# ... the ... 10 June 1927 ... decree only said 10 June 1927, without 2387# specifying a time, so I suppose that it should be considered at 0:00. 2388# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4541520&fecha=09/06/1927&cod_diario=193920 2389# 2390# In 1942, the decree changing Baja California, Baja California Sur, Sonora, 2391# Sinaloa and Nayarit to UTC-7 was published on 24 April, but it said that it 2392# would apply from 1 April, so it's unclear when the change actually 2393# occurred. The database currently shows 24 April 1942. 2394# https://www.dof.gob.mx/nota_to_imagen_fs.php?cod_diario=192203&pagina=2&seccion=1 2395# 2396# Baja California Sur, Sonora, Sinaloa and Nayarit never used UTC-8. The ... 2397# 14 January 1949 ... change [to UTC-8] only occurred in Baja California. 2398# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4515613&fecha=13/01/1949&cod_diario=192309 2399# 2400# In 1945, the decree changing Baja California to UTC-8 specified that it 2401# would take effect on the third day from its publication. 2402# It was published on 12 November, so it would take effect on 15 November.... 2403# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4555049&fecha=12/11/1945&cod_diario=194763 2404# 2405# In 1948, the decree changing Baja California to UTC-7 specified that it 2406# would take effect on "this date". The decree was made on 13 March, 2407# but published on 5 April, so it's unclear when the change actually occurred. 2408# The database currently shows 5 April 1948. 2409# https://www.dof.gob.mx/nota_to_imagen_fs.php?cod_diario=188624&pagina=2&seccion=0 2410# 2411# In 1949, the decree changing Baja California to UTC-8 was published on 13 2412# January, but it said that it would apply from 1 January, so it's unclear when 2413# the change actually occurred. The database currently shows 14 January 1949. 2414# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4515613&fecha=13/01/1949&cod_diario=192309 2415# 2416# Baja California also observed UTC-7 from 1 May to 24 September 1950, 2417# from 29 April to 30 September 1951 at 2:00, 2418# and from 27 April to 28 September 1952 at 2:00.... 2419# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4600403&fecha=29/04/1950&cod_diario=197505 2420# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4623553&fecha=23/09/1950&cod_diario=198805 2421# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4469444&fecha=27/04/1951&cod_diario=189317 2422# https://www.dof.gob.mx/nota_to_imagen_fs.php?codnota=4533868&fecha=10/03/1952&cod_diario=193465 2423# 2424# All changes in Baja California from 1948 to 1952 match those in California, 2425# on the same dates or with a difference of one day. 2426# So it may be easier to implement these changes as DST with rule CA 2427# during this whole period. 2428# 2429# From Paul Eggert (2024-08-18): 2430# For now, maintain the slightly-different history for Baja California, 2431# as we have no information on whether 1948/1952 clocks in Tijuana followed 2432# the decrees or followed San Diego. 2433 2434# From Alan Perry (1996-02-15): 2435# A guy from our Mexico subsidiary finally found the Presidential Decree 2436# outlining the timezone changes in Mexico. 2437# 2438# ------------- Begin Forwarded Message ------------- 2439# 2440# I finally got my hands on the Official Presidential Decree that sets up the 2441# rules for the DST changes. The rules are: 2442# 2443# 1. The country is divided in 3 timezones: 2444# - Baja California Norte (the Mexico/BajaNorte TZ) 2445# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 2446# - The rest of the country (the Mexico/General TZ) 2447# 2448# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 2449# at 2:00 AM, the times in each zone are as follows: 2450# BajaNorte: GMT+7 2451# BajaSur: GMT+6 2452# General: GMT+5 2453# 2454# 3. The rest of the year, the times are as follows: 2455# BajaNorte: GMT+8 2456# BajaSur: GMT+7 2457# General: GMT+6 2458# 2459# The Decree was published in Mexico's Official Newspaper on January 4th. 2460# 2461# -------------- End Forwarded Message -------------- 2462# From Paul Eggert (1996-06-12): 2463# For an English translation of the decree, see 2464# "Diario Oficial: Time Zone Changeover" (1996-01-04). 2465# http://mexico-travel.com/extra/timezone_eng.html 2466 2467# From Rives McDow (1998-10-08): 2468# The State of Quintana Roo has reverted back to central STD and DST times 2469# (i.e. UTC -0600 and -0500 as of 1998-08-02). 2470 2471# From Rives McDow (2000-01-10): 2472# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 2473# zone 5 hours from the International Date Line, and will not observe daylight 2474# savings time so as to stay on the same time zone as the southern part of 2475# Arizona year round. 2476 2477# From Jesper Nørgaard, translating 2478# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 2479# In Oaxaca, the 55.000 teachers from the Section 22 of the National 2480# Syndicate of Education Workers, refuse to apply daylight saving each 2481# year, so that the more than 10,000 schools work at normal hour the 2482# whole year. 2483 2484# From Gwillim Law (2001-01-19): 2485# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 2486# (translated):... 2487# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 2488# that Summer Time will be reduced from seven to five months, starting 2489# this year.... 2490# http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001 2491# [translated], says "summer time will ... take effect on the first Sunday 2492# in May, and end on the last Sunday of September. 2493 2494# From Arthur David Olson (2001-01-25): 2495# The 2001-01-24 traditional Washington Post contained the page one 2496# story "Timely Issue Divides Mexicans."... 2497# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 2498# ... Mexico City Mayor López Obrador "...is threatening to keep 2499# Mexico City and its 20 million residents on a different time than 2500# the rest of the country..." In particular, López Obrador would abolish 2501# observation of Daylight Saving Time. 2502 2503# Official statute published by the Energy Department 2504# http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre 2505# (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 2506# and Sonora with no DST. This was reported by Jesper Nørgaard (2001-02-03). 2507 2508# From Paul Eggert (2001-03-03): 2509# 2510# https://www.latimes.com/archives/la-xpm-2001-mar-03-mn-32561-story.html 2511# James F. Smith writes in today's LA Times 2512# * Sonora will continue to observe standard time. 2513# * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that 2514# the Federal District will not adopt DST. 2515# * 4 of 16 district leaders announced they'll ignore the decree. 2516# * The decree does not affect federal-controlled facilities including 2517# the airport, banks, hospitals, and schools. 2518# 2519# For now we'll assume that the Federal District will bow to federal rules. 2520 2521# From Jesper Nørgaard (2001-04-01): 2522# I found some references to the Mexican application of daylight 2523# saving, which modifies what I had already sent you, stating earlier 2524# that a number of northern Mexican states would go on daylight 2525# saving. The modification reverts this to only cover Baja California 2526# (Norte), while all other states (except Sonora, who has no daylight 2527# saving all year) will follow the original decree of president 2528# Vicente Fox, starting daylight saving May 6, 2001 and ending 2529# September 30, 2001. 2530# References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp> 2531# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 2532 2533# From Reuters (2001-09-04): 2534# Mexico's Supreme Court on Tuesday declared that daylight savings was 2535# unconstitutional in Mexico City, creating the possibility the 2536# capital will be in a different time zone from the rest of the nation 2537# next year.... The Supreme Court's ruling takes effect at 2:00 2538# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 2539# standard time. "This is so residents of the Federal District are not 2540# subject to unexpected time changes," a statement from the court said. 2541 2542# From Jesper Nørgaard Welen (2002-03-12): 2543# ... consulting my local grocery store(!) and my coworkers, they all insisted 2544# that a new decision had been made to reinstate US style DST in Mexico.... 2545# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 2546# confirms this. Sonora as usual is the only state where DST is not applied. 2547 2548# From Steffen Thorsen (2009-12-28): 2549# 2550# Steffen Thorsen wrote: 2551# > Mexico's House of Representatives has approved a proposal for northern 2552# > Mexico's border cities to share the same daylight saving schedule as 2553# > the United States. 2554# Now this has passed both the Congress and the Senate, so starting from 2555# 2010, some border regions will be the same: 2556# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/ 2557# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939 2558# (Spanish) 2559# 2560# Could not find the new law text, but the proposed law text changes are here: 2561# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf 2562# (Gaceta Parlamentaria) 2563# 2564# There is also a list of the votes here: 2565# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html 2566# 2567# Our page: 2568# https://www.timeanddate.com/news/time/north-mexico-dst-change.html 2569 2570# From Arthur David Olson (2010-01-20): 2571# The page 2572# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2573# includes this text: 2574# En los municipios fronterizos de Tijuana y Mexicali en Baja California; 2575# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila; 2576# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en 2577# Tamaulipas, la aplicación de este horario estacional surtirá efecto 2578# desde las dos horas del segundo domingo de marzo y concluirá a las dos 2579# horas del primer domingo de noviembre. 2580# En los municipios fronterizos que se encuentren ubicados en la franja 2581# fronteriza norte en el territorio comprendido entre la línea 2582# internacional y la línea paralela ubicada a una distancia de veinte 2583# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el 2584# interior del país, la aplicación de este horario estacional surtirá 2585# efecto desde las dos horas del segundo domingo de marzo y concluirá a 2586# las dos horas del primer domingo de noviembre. 2587 2588# From Steffen Thorsen (2014-12-08), translated by Gwillim Law: 2589# The Mexican state of Quintana Roo will likely change to EST in 2015. 2590# 2591# http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo 2592# "With this change, the time conflict that has existed between the municipios 2593# of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an 2594# end. The latter declared itself in rebellion 15 years ago when a time change 2595# was initiated in Mexico, and since then it has refused to change its time 2596# zone along with the rest of the country." 2597# 2598# From Steffen Thorsen (2015-01-14), translated by Gwillim Law: 2599# http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html 2600# "...the new time zone will come into effect at two o'clock on the first Sunday 2601# of February, when we will have to advance the clock one hour from its current 2602# time..." 2603# Also, the new zone will not use DST. 2604# 2605# From Carlos Raúl Perasso (2015-02-02): 2606# The decree that modifies the Mexican Hour System Law has finally 2607# been published at the Diario Oficial de la Federación 2608# http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015 2609# It establishes 5 zones for Mexico: 2610# 1- Zona Centro (Central Zone): Corresponds to longitude 90 W, 2611# includes most of Mexico, excluding what's mentioned below. 2612# 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the 2613# states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía 2614# de Banderas which lies in Central Zone); Sinaloa and Sonora. 2615# 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the 2616# state of Baja California. 2617# 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state 2618# of Quintana Roo. 2619# 5- The islands, reefs and keys shall take their timezone from the 2620# longitude they are located at. 2621 2622# From Paul Eggert (2022-10-28): 2623# The new Mexican law was published today: 2624# https://www.dof.gob.mx/nota_detalle.php?codigo=5670045&fecha=28/10/2022 2625# This abolishes DST except where US DST rules are observed, 2626# and in addition changes all of Chihuahua to -06 with no DST. 2627 2628# From Heitor David Pinto (2022-11-28): 2629# Now the northern [municipios] want to have the same time zone as the 2630# respective neighboring cities in the US, for example Juárez in UTC-7 with 2631# DST, matching El Paso, and Ojinaga in UTC-6 with DST, matching Presidio.... 2632# the president authorized the publication of the decree for November 29, 2633# so the time change would occur on November 30 at 0:00. 2634# http://puentelibre.mx/noticia/ciudad_juarez_cambio_horario_noviembre_2022/ 2635 2636# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 2637Rule Mexico 1931 only - Apr 30 0:00 1:00 D 2638Rule Mexico 1931 only - Oct 1 0:00 0 S 2639Rule Mexico 1939 only - Feb 5 0:00 1:00 D 2640Rule Mexico 1939 only - Jun 25 0:00 0 S 2641Rule Mexico 1940 only - Dec 9 0:00 1:00 D 2642Rule Mexico 1941 only - Apr 1 0:00 0 S 2643Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 2644Rule Mexico 1944 only - May 1 0:00 0 S 2645Rule Mexico 1950 only - Feb 12 0:00 1:00 D 2646Rule Mexico 1950 only - Jul 30 0:00 0 S 2647Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 2648Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 2649Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 2650Rule Mexico 2001 only - Sep lastSun 2:00 0 S 2651Rule Mexico 2002 2022 - Apr Sun>=1 2:00 1:00 D 2652Rule Mexico 2002 2022 - Oct lastSun 2:00 0 S 2653# Zone NAME STDOFF RULES FORMAT [UNTIL] 2654# Quintana Roo; represented by Cancún 2655Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 6:00u 2656 -6:00 - CST 1981 Dec 26 2:00 2657 -5:00 - EST 1983 Jan 4 0:00 2658 -6:00 Mexico C%sT 1997 Oct 26 2:00 2659 -5:00 Mexico E%sT 1998 Aug 2 2:00 2660 -6:00 Mexico C%sT 2015 Feb 1 2:00 2661 -5:00 - EST 2662# Campeche, Yucatán; represented by Mérida 2663Zone America/Merida -5:58:28 - LMT 1922 Jan 1 6:00u 2664 -6:00 - CST 1981 Dec 26 2:00 2665 -5:00 - EST 1982 Nov 2 2:00 2666 -6:00 Mexico C%sT 2667# Coahuila, Nuevo León, Tamaulipas (near US border) 2668# This includes the following municipios: 2669# in Coahuila: Acuña, Allende, Guerrero, Hidalgo, Jiménez, Morelos, Nava, 2670# Ocampo, Piedras Negras, Villa Unión, Zaragoza 2671# in Nuevo León: Anáhuac 2672# in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo, 2673# Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso, Matamoros. 2674# https://www.dof.gob.mx/nota_detalle.php?codigo=5670045&fecha=28/10/2022 2675Zone America/Matamoros -6:30:00 - LMT 1922 Jan 1 6:00u 2676 -6:00 - CST 1988 2677 -6:00 US C%sT 1989 2678 -6:00 Mexico C%sT 2010 2679 -6:00 US C%sT 2680# Durango; Coahuila, Nuevo León, Tamaulipas (away from US border) 2681Zone America/Monterrey -6:41:16 - LMT 1922 Jan 1 6:00u 2682 -7:00 - MST 1927 Jun 10 2683 -6:00 - CST 1930 Nov 15 2684 -7:00 Mexico M%sT 1932 Apr 1 2685 -6:00 - CST 1988 2686 -6:00 US C%sT 1989 2687 -6:00 Mexico C%sT 2688# Central Mexico 2689Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 7:00u 2690 -7:00 - MST 1927 Jun 10 2691 -6:00 - CST 1930 Nov 15 2692 -7:00 Mexico M%sT 1932 Apr 1 2693 -6:00 Mexico C%sT 2001 Sep 30 2:00 2694 -6:00 - CST 2002 Feb 20 2695 -6:00 Mexico C%sT 2696# Chihuahua (near US border - western side) 2697# This includes the municipios of Janos, Ascensión, Juárez, Guadalupe, and 2698# Práxedis G Guerrero. 2699# http://gaceta.diputados.gob.mx/PDF/65/2a022/nov/20221124-VII.pdf 2700Zone America/Ciudad_Juarez -7:05:56 - LMT 1922 Jan 1 7:00u 2701 -7:00 - MST 1927 Jun 10 2702 -6:00 - CST 1930 Nov 15 2703 -7:00 Mexico M%sT 1932 Apr 1 2704 -6:00 - CST 1996 2705 -6:00 Mexico C%sT 1998 2706 -6:00 - CST 1998 Apr Sun>=1 3:00 2707 -7:00 Mexico M%sT 2010 2708 -7:00 US M%sT 2022 Oct 30 2:00 2709 -6:00 - CST 2022 Nov 30 0:00 2710 -7:00 US M%sT 2711# Chihuahua (near US border - eastern side) 2712# This includes the municipios of Coyame del Sotol, Ojinaga, and Manuel 2713# Benavides. 2714# http://gaceta.diputados.gob.mx/PDF/65/2a022/nov/20221124-VII.pdf 2715Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 7:00u 2716 -7:00 - MST 1927 Jun 10 2717 -6:00 - CST 1930 Nov 15 2718 -7:00 Mexico M%sT 1932 Apr 1 2719 -6:00 - CST 1996 2720 -6:00 Mexico C%sT 1998 2721 -6:00 - CST 1998 Apr Sun>=1 3:00 2722 -7:00 Mexico M%sT 2010 2723 -7:00 US M%sT 2022 Oct 30 2:00 2724 -6:00 - CST 2022 Nov 30 0:00 2725 -6:00 US C%sT 2726# Chihuahua (away from US border) 2727Zone America/Chihuahua -7:04:20 - LMT 1922 Jan 1 7:00u 2728 -7:00 - MST 1927 Jun 10 2729 -6:00 - CST 1930 Nov 15 2730 -7:00 Mexico M%sT 1932 Apr 1 2731 -6:00 - CST 1996 2732 -6:00 Mexico C%sT 1998 2733 -6:00 - CST 1998 Apr Sun>=1 3:00 2734 -7:00 Mexico M%sT 2022 Oct 30 2:00 2735 -6:00 - CST 2736# Sonora 2737Zone America/Hermosillo -7:23:52 - LMT 1922 Jan 1 7:00u 2738 -7:00 - MST 1927 Jun 10 2739 -6:00 - CST 1930 Nov 15 2740 -7:00 Mexico M%sT 1932 Apr 1 2741 -6:00 - CST 1942 Apr 24 2742 -7:00 - MST 1996 2743 -7:00 Mexico M%sT 1999 2744 -7:00 - MST 2745 2746# Baja California Sur, Nayarit (except Bahía de Banderas), Sinaloa 2747Zone America/Mazatlan -7:05:40 - LMT 1922 Jan 1 7:00u 2748 -7:00 - MST 1927 Jun 10 2749 -6:00 - CST 1930 Nov 15 2750 -7:00 Mexico M%sT 1932 Apr 1 2751 -6:00 - CST 1942 Apr 24 2752 -7:00 - MST 1970 2753 -7:00 Mexico M%sT 2754 2755# Bahía de Banderas 2756 2757# From Alexander Krivenyshev (2010-04-21): 2758# According to news, Bahía de Banderas (Mexican state of Nayarit) 2759# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to 2760# share the same time zone as nearby city Puerto Vallarta, Jalisco). 2761# 2762# (Spanish) 2763# Bahía de Banderas homologa su horario al del centro del 2764# país, a partir de este domingo 2765# http://www.nayarit.gob.mx/notes.asp?id=20748 2766# 2767# Bahía de Banderas homologa su horario con el del Centro del 2768# País 2769# 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 2770# 2771# (English) 2772# Puerto Vallarta and Bahía de Banderas: One Time Zone 2773# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml 2774# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html 2775# 2776# "Mexico's Senate approved the amendments to the Mexican Schedule System that 2777# will allow Bahía de Banderas and Puerto Vallarta to share the same time 2778# zone ..." 2779# Baja California Sur, Nayarit, Sinaloa 2780 2781# From Arthur David Olson (2010-05-01): 2782# Use "Bahia_Banderas" to keep the name to fourteen characters. 2783 2784Zone America/Bahia_Banderas -7:01:00 - LMT 1922 Jan 1 7:00u 2785 -7:00 - MST 1927 Jun 10 2786 -6:00 - CST 1930 Nov 15 2787 -7:00 Mexico M%sT 1932 Apr 1 2788 -6:00 - CST 1942 Apr 24 2789 -7:00 - MST 1970 2790 -7:00 Mexico M%sT 2010 Apr 4 2:00 2791 -6:00 Mexico C%sT 2792 2793# Baja California 2794Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 7:00u 2795 -7:00 - MST 1924 2796 -8:00 - PST 1927 Jun 10 2797 -7:00 - MST 1930 Nov 15 2798 -8:00 - PST 1931 Apr 1 2799 -8:00 1:00 PDT 1931 Sep 30 2800 -8:00 - PST 1942 Apr 24 2801 -8:00 1:00 PWT 1945 Aug 14 23:00u 2802 -8:00 1:00 PPT 1945 Nov 15 # Peace 2803 -8:00 - PST 1948 Apr 5 2804 -8:00 1:00 PDT 1949 Jan 14 2805 -8:00 - PST 1950 May 1 2806 -8:00 1:00 PDT 1950 Sep 24 2807 -8:00 - PST 1951 Apr 29 2:00 2808 -8:00 1:00 PDT 1951 Sep 30 2:00 2809 -8:00 - PST 1952 Apr 27 2:00 2810 -8:00 1:00 PDT 1952 Sep 28 2:00 2811 -8:00 - PST 1954 2812 -8:00 CA P%sT 1961 2813 -8:00 - PST 1976 2814 -8:00 US P%sT 1996 2815 -8:00 Mexico P%sT 2001 2816 -8:00 US P%sT 2002 Feb 20 2817 -8:00 Mexico P%sT 2010 2818 -8:00 US P%sT 2819# From Paul Eggert (2006-03-22): 2820# Formerly there was an America/Ensenada zone, which differed from 2821# America/Tijuana only in that it did not observe DST from 1976 2822# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say 2823# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports 2824# that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and 2825# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that 2826# DST-observance was a town-by-town matter back then. This concerns 2827# data after 1970 so most likely there should be at least one Zone 2828# other than America/Tijuana for Baja, but it's not clear yet what its 2829# name or contents should be. 2830# 2831# From Paul Eggert (2015-10-08): 2832# Formerly there was an America/Santa_Isabel zone, but this appears to 2833# have come from a misreading of 2834# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2835# It has been moved to the 'backward' file. 2836# 2837# From Paul Eggert (2022-10-28): 2838# Today's new law states that the entire state of Baja California 2839# follows US DST rules, which agrees with simplifications noted above. 2840# 2841# 2842# Revillagigedo Is 2843# no information 2844 2845############################################################################### 2846 2847# Barbados 2848 2849# For 1899 Milne gives -3:58:29.2. 2850 2851# From P Chan (2020-12-09 and 2020-12-11): 2852# Standard time of GMT-4 was adopted in 1911. 2853# Definition of Time Act, 1911 (1911-7) [1911-08-28] 2854# 1912, Laws of Barbados (5 v.), OCLC Number: 919801291, Vol. 4, Image No. 522 2855# 1944, Laws of Barbados (5 v.), OCLC Number: 84548697, Vol. 4, Image No. 122 2856# http://llmc.com/browse.aspx?type=2&coll=85&div=297 2857# 2858# DST was observed in 1942-44. 2859# Defence (Daylight Saving) Regulations, 1942, 1942-04-13 2860# Defence (Daylight Saving) (Repeal) Regulations, 1942, 1942-08-22 2861# Defence (Daylight Saving) Regulations, 1943, 1943-04-16 2862# Defence (Daylight Saving) (Repeal) Regulations, 1943, 1943-09-01 2863# Defence (Daylight Saving) Regulations, 1944, 1944-03-21 2864# [Defence (Daylight Saving) (Amendment) Regulations 1944, 1944-03-28] 2865# Defence (Daylight Saving) (Repeal) Regulations, 1944, 1944-08-30 2866# 2867# 1914-, Subsidiary Legis., Annual Vols. OCLC Number: 226290591 2868# 1942: Image Nos. 527-528, 555-556 2869# 1943: Image Nos. 178-179, 198 2870# 1944: Image Nos. 113-115, 129 2871# http://llmc.com/titledescfull.aspx?type=2&coll=85&div=297&set=98437 2872# 2873# From Tim Parenti (2021-02-20): 2874# The transitions below are derived from P Chan's sources, except that the 1977 2875# through 1980 transitions are from Shanks & Pottenger since we have no better 2876# data there. Of particular note, the 1944 DST regulation only advanced the 2877# time to "exactly three and a half hours later than Greenwich mean time", as 2878# opposed to "three hours" in the 1942 and 1943 regulations. 2879 2880# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 2881Rule Barb 1942 only - Apr 19 5:00u 1:00 D 2882Rule Barb 1942 only - Aug 31 6:00u 0 S 2883Rule Barb 1943 only - May 2 5:00u 1:00 D 2884Rule Barb 1943 only - Sep 5 6:00u 0 S 2885Rule Barb 1944 only - Apr 10 5:00u 0:30 - 2886Rule Barb 1944 only - Sep 10 6:00u 0 S 2887Rule Barb 1977 only - Jun 12 2:00 1:00 D 2888Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 2889Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 2890Rule Barb 1979 only - Sep 30 2:00 0 S 2891Rule Barb 1980 only - Sep 25 2:00 0 S 2892# Zone NAME STDOFF RULES FORMAT [UNTIL] 2893 #STDOFF -3:58:29.2 2894Zone America/Barbados -3:58:29 - LMT 1911 Aug 28 # Bridgetown 2895 -4:00 Barb A%sT 1944 2896 -4:00 Barb AST/-0330 1945 2897 -4:00 Barb A%sT 2898 2899# Belize 2900 2901# From P Chan (2020-11-03): 2902# Below are some laws related to the time in British Honduras/Belize: 2903# 2904# Definition of Time Ordinance, 1927 (No.4 of 1927) [1927-04-01] 2905# Ordinances of British Honduras Passed in the Year 1927, p 19-20 2906# https://books.google.com/books?id=LqEpAQAAMAAJ&pg=RA3-PA19 2907# 2908# Definition of Time (Amendment) Ordinance, 1942 (No. 5 of 1942) [1942-06-27] 2909# Ordinances of British Honduras Passed in the Year 1942, p 31-32 2910# https://books.google.com/books?id=h6MpAQAAMAAJ&pg=RA6-PA95-IA44 2911# 2912# Definition of Time Ordinance, 1945 (No. 19 of 1945) [1945-12-15] 2913# Ordinances of British Honduras Passed in the Year 1945, p 49-50 2914# https://books.google.com/books?id=xaMpAQAAMAAJ&pg=RA2-PP1 2915# 2916# Definition of Time Ordinance, 1947 (No. 1 of 1947) [1947-03-11] 2917# Ordinances of British Honduras Passed in the Year 1947, p 1-2 2918# https://books.google.com/books?id=xaMpAQAAMAAJ&pg=RA3-PA1 2919# 2920# Time (Definition of) Ordinance (Chapter 180) 2921# The Laws of British Honduras in Force on the 15th Day of September, 1958 , Volume IV, p 2580 2922# https://books.google.com/books?id=v5QpAQAAMAAJ&pg=PA2580 2923# 2924# Time (Definition of) (Amendment) Ordinance, 1968 (No. 13 of 1968) [1968-08-03] 2925# https://books.google.com/books?id=xij7KEB_58wC&pg=RA1-PA428-IA9 2926# 2927# Definition of Time Act (Chapter 339) 2928# Law of Belize, Revised Edition 2000 2929# http://www.belizelaw.org/web/lawadmin/PDF%20files/cap339.pdf 2930 2931# From Paul Eggert (2020-11-03): 2932# The transitions below are derived from P Chan's sources, except that the 2933# 1973 through 1983 transitions are from Shanks & Pottenger since we have 2934# no better data there. 2935 2936# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 2937Rule Belize 1918 1941 - Oct Sat>=1 24:00 0:30 -0530 2938Rule Belize 1919 1942 - Feb Sat>=8 24:00 0 CST 2939Rule Belize 1942 only - Jun 27 24:00 1:00 CWT 2940Rule Belize 1945 only - Aug 14 23:00u 1:00 CPT 2941Rule Belize 1945 only - Dec 15 24:00 0 CST 2942Rule Belize 1947 1967 - Oct Sat>=1 24:00 0:30 -0530 2943Rule Belize 1948 1968 - Feb Sat>=8 24:00 0 CST 2944Rule Belize 1973 only - Dec 5 0:00 1:00 CDT 2945Rule Belize 1974 only - Feb 9 0:00 0 CST 2946Rule Belize 1982 only - Dec 18 0:00 1:00 CDT 2947Rule Belize 1983 only - Feb 12 0:00 0 CST 2948# Zone NAME STDOFF RULES FORMAT [UNTIL] 2949Zone America/Belize -5:52:48 - LMT 1912 Apr 1 2950 -6:00 Belize %s 2951 2952# Bermuda 2953 2954# From Paul Eggert (2022-07-27): 2955# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower, 2956# Bermuda dockyard, Ireland I. This agrees with standard offset given in the 2957# Daylight Saving Act, 1917 cited below. 2958# It is not known when this time became standard for Bermuda; guess 1890. 2959# The transition to -04 was specified by: 2960# 1930: The Time Zone Act, 1929 (1929: No. 39) [1929-11-08] 2961# https://books.google.com/books?id=7tdMAQAAIAAJ&pg=RA54-PP1 2962 2963# From P Chan (2020-11-20): 2964# Most of the information can be found online from the Bermuda National 2965# Library - Digital Collection which includes The Royal Gazette (RG) until 1957 2966# https://bnl.contentdm.oclc.org/digital/ 2967# I will cite the ID. For example, [10000] means 2968# https://bnl.contentdm.oclc.org/digital/collection/BermudaNP02/id/10000 2969# 2970# 1917: Apr 5 midnight to Sep 30 midnight 2971# Daylight Saving Act, 1917 (1917 No. 13) [1917-04-02] 2972# Bermuda Acts and Resolves 1917, p 37-38 2973# https://books.google.com/books?id=M-lCAQAAMAAJ&pg=PA36-IA2 2974# RG, 1917-04-04, p 6 [42340] gives the spring forward date. 2975# 2976# 1918: Apr 13 midnight to Sep 15 midnight 2977# Daylight Saving Act, 1918 (1918 No. 9) [1918-04-06] 2978# Bermuda Acts and Resolves 1917, p 13 2979# https://books.google.com/books?id=K-lCAQAAMAAJ&pg=RA1-PA7 2980# 2981# Note that local mean time was still used before 1930. 2982# 2983# During WWII, DST was introduced by Defence Regulations 2984# 1942: Jan 11 02:00 to Oct 18 02:00 [113646], [115726] 2985# 1943: Mar 21 02:00 to Oct 31 02:00 [116704], [118193] 2986# 1944: Mar 12 02:00 to Nov 5 02:00 [119225], [121593] 2987# 1945: Mar 11 02:00 to Nov 4 02:00 [122369], [124461] 2988# RG, 1942-01-08, p 2, 1942-10-12, p 2 , 1943-03-06, p 2, 1943-09-03, p 1, 2989# 1944-02-29, p 6, 1944-09-20, p 2, 1945-02-13, p 2, 1945-11-03, p 1 2990# 2991# In 1946, the House of Assembly rejected DST twice. [128686], [128076] 2992# RG, 1946-03-16 p 1,1946-04-13 p 1 2993# 2994# 1947: third Sunday in May 02:00 to second Sunday in September 02:00 2995# DST in 1947 was defined in the Daylight Saving Act, 1947 (1947: No. 12) 2996# which expired at the end of the year. [125784] ,[132405], [144454], [138226] 2997# RG, 1947-02-27, p 1, 1947-05-15, p 1, 1947-09-13, p 1, 1947-12-30, p 1 2998# 2999# 1948-1952: fourth Sunday in May 02:00 to first Sunday in September 02:00 3000# DST in 1948 was defined in the Daylight Saving Act, 1948 (1948 : No. 12) 3001# which was set to expired at the end of the year but it was extended until 3002# the end of 1952 and was not further extended. 3003# [129802], [139403], [146008], [135240], [144330], [139049], [143309], 3004# [148271], [149773], [153589], [153802], [155924] 3005# RG, 1948-04-13, p 1, 1948-05-22, p 1, 1948-09-04, p 1, 1949-05-21, p1, 3006# 1949-09-03, p 1, 1950-05-27 p 1, 1950-09-02, p 1, 1951-05-27, p 1, 3007# 1951-09-01, p 1, 1952-05-23, p 1, 1952-09-26, p 1, 1952-12-21, p 8 3008# 3009# In 1953-1955, the House of Assembly rejected DST each year. [158996], 3010# [162620], [166720] RG, 1953-05-02, p 1, 1954-04-01 p 1, 1955-03-12, p 1 3011# 3012# 1956: fourth Sunday in May 02:00 to last Sunday in October 02:00 3013# Time Zone (Seasonal Variation) Act, 1956 (1956: No.44) [1956-05-25] 3014# Bermuda Public Acts 1956, p 331-332 3015# https://books.google.com/books?id=Xs1AlmD_cEwC&pg=PA63 3016# 3017# The extension of the Act was rejected by the House of Assembly. [176218] 3018# RG, 1956-12-13, p 1 3019# 3020# From the Chronological Table of Public and Private Acts up to 1985, it seems 3021# that there does not exist other Acts related to DST before 1973. 3022# https://books.google.com/books?id=r9hMAQAAIAAJ&pg=RA23-PA1 3023# Public Acts of the Legislature of the Islands of Bermuda, Together with 3024# Statutory Instruments in Force Thereunder, Vol VII 3025 3026# From Dan Jones, reporting in The Royal Gazette (2006-06-26): 3027# Next year, however, clocks in the US will go forward on the second Sunday 3028# in March, until the first Sunday in November. And, after the Time Zone 3029# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on 3030# Friday, the same thing will happen in Bermuda. 3031# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135 3032 3033# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3034Rule Bermuda 1917 only - Apr 5 24:00 1:00 - 3035Rule Bermuda 1917 only - Sep 30 24:00 0 - 3036Rule Bermuda 1918 only - Apr 13 24:00 1:00 - 3037Rule Bermuda 1918 only - Sep 15 24:00 0 S 3038Rule Bermuda 1942 only - Jan 11 2:00 1:00 D 3039Rule Bermuda 1942 only - Oct 18 2:00 0 S 3040Rule Bermuda 1943 only - Mar 21 2:00 1:00 D 3041Rule Bermuda 1943 only - Oct 31 2:00 0 S 3042Rule Bermuda 1944 1945 - Mar Sun>=8 2:00 1:00 D 3043Rule Bermuda 1944 1945 - Nov Sun>=1 2:00 0 S 3044Rule Bermuda 1947 only - May Sun>=15 2:00 1:00 D 3045Rule Bermuda 1947 only - Sep Sun>=8 2:00 0 S 3046Rule Bermuda 1948 1952 - May Sun>=22 2:00 1:00 D 3047Rule Bermuda 1948 1952 - Sep Sun>=1 2:00 0 S 3048Rule Bermuda 1956 only - May Sun>=22 2:00 1:00 D 3049Rule Bermuda 1956 only - Oct lastSun 2:00 0 S 3050 3051# Zone NAME STDOFF RULES FORMAT [UNTIL] 3052 #STDOFF -4:19:18.3 3053Zone Atlantic/Bermuda -4:19:18 - LMT 1890 # Hamilton 3054 -4:19:18 Bermuda BMT/BST 1930 Jan 1 2:00 3055 -4:00 Bermuda A%sT 1974 Apr 28 2:00 3056 -4:00 Canada A%sT 1976 3057 -4:00 US A%sT 3058 3059# Costa Rica 3060 3061# Milne gives -5:36:13.3 as San José mean time. 3062 3063# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3064Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 3065Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 3066Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 3067# IATA SSIM (1991-09) says the following was at 1:00; 3068# go with Shanks & Pottenger. 3069Rule CR 1991 only - Jul 1 0:00 0 S 3070Rule CR 1992 only - Mar 15 0:00 0 S 3071# There are too many San Josés elsewhere, so we'll use 'Costa Rica'. 3072# Zone NAME STDOFF RULES FORMAT [UNTIL] 3073 #STDOFF -5:36:13.3 3074Zone America/Costa_Rica -5:36:13 - LMT 1890 # San José 3075 -5:36:13 - SJMT 1921 Jan 15 # San José Mean Time 3076 -6:00 CR C%sT 3077# Coco 3078# no information; probably like America/Costa_Rica 3079 3080# Cuba 3081 3082# From Paul Eggert (2013-02-21): 3083# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57 3084# for the port, and -5:30 for meteorological observations. 3085# For now, stick with Shanks & Pottenger. 3086 3087# From Arthur David Olson (1999-03-29): 3088# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 3089# the Cuban National Team and the Baltimore Orioles was carried live on 3090# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 3091# During the game, play-by-play announcer Jim Hunter noted that 3092# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 3093# Time today." (The "two hour" remark referred to losing one hour of 3094# sleep on 1999-03-28 - when the announcers were in Cuba as it switched 3095# to DST - and one more hour on 1999-04-04 - when the announcers will have 3096# returned to Baltimore, which switches on that date.) 3097 3098# From Steffen Thorsen (2013-11-11): 3099# DST start in Cuba in 2004 ... does not follow the same rules as the 3100# years before. The correct date should be Sunday 2004-03-28 00:00 ... 3101# https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html 3102 3103# From Evert van der Veer via Steffen Thorsen (2004-10-28): 3104# Cuba is not going back to standard time this year. 3105# From Paul Eggert (2006-03-22): 3106# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 3107# says that it's due to a problem at the Antonio Guiteras 3108# thermoelectric plant, and says "This October there will be no return 3109# to normal hours (after daylight saving time)". 3110# For now, let's assume that it's a temporary measure. 3111 3112# From Carlos A. Carnero Delgado (2005-11-12): 3113# This year (just like in 2004-2005) there's no change in time zone 3114# adjustment in Cuba. We will stay in daylight saving time: 3115# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html 3116 3117# From Jesper Nørgaard Welen (2006-10-21): 3118# An article in GRANMA INTERNACIONAL claims that Cuba will end 3119# the 3 years of permanent DST next weekend, see 3120# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html 3121# "On Saturday night, October 28 going into Sunday, October 29, at 01:00, 3122# watches should be set back one hour - going back to 00:00 hours - returning 3123# to the normal schedule.... 3124 3125# From Paul Eggert (2007-03-02): 3126# <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday, 3127# says Cuban clocks will advance at midnight on March 10. 3128# For lack of better information, assume Cuba will use US rules, 3129# except that it switches at midnight standard time as usual. 3130# 3131# From Steffen Thorsen (2007-10-25): 3132# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week 3133# earlier - on the last Sunday of October, just like in 2006. 3134# 3135# He supplied these references: 3136# 3137# http://www.prensalatina.com.mx/article.asp?ID={4CC32C1B-A9F7-42FB-8A07-8631AFC923AF}&language=ES 3138# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm 3139# 3140# From Alex Krivenyshev (2007-10-25): 3141# Here is also article from Granma (Cuba): 3142# 3143# Regirá el Horario Normal desde el próximo domingo 28 de octubre 3144# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html 3145# 3146# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html 3147 3148# From Arthur David Olson (2008-03-09): 3149# I'm in Maryland which is now observing United States Eastern Daylight 3150# Time. At 9:44 local time I used RealPlayer to listen to 3151# http://media.enet.cu/radioreloj 3152# a Cuban information station, and heard 3153# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"), 3154# indicating that Cuba is still on standard time. 3155 3156# From Steffen Thorsen (2008-03-12): 3157# It seems that Cuba will start DST on Sunday, 2007-03-16... 3158# It was announced yesterday, according to this source (in Spanish): 3159# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm 3160# 3161# Some more background information is posted here: 3162# https://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html 3163# 3164# The article also says that Cuba has been observing DST since 1963, 3165# while Shanks (and tzdata) has 1965 as the first date (except in the 3166# 1940's). Many other web pages in Cuba also claim that it has been 3167# observed since 1963, but with the exception of 1970 - an exception 3168# which is not present in tzdata/Shanks. So there is a chance we need to 3169# change some historic records as well. 3170# 3171# One example: 3172# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm 3173 3174# From Jesper Nørgaard Welen (2008-03-13): 3175# The Cuban time change has just been confirmed on the most authoritative 3176# web site, the Granma. Please check out 3177# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html 3178# 3179# Basically as expected after Steffen Thorsen's information, the change 3180# will take place midnight between Saturday and Sunday. 3181 3182# From Arthur David Olson (2008-03-12): 3183# Assume Sun>=15 (third Sunday) going forward. 3184 3185# From Alexander Krivenyshev (2009-03-04) 3186# According to the Radio Reloj - Cuba will start Daylight Saving Time on 3187# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009- 3188# not on midnight March 14 / March 15 as previously thought. 3189# 3190# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html 3191# (in Spanish) 3192 3193# From Arthur David Olson (2009-03-09) 3194# I listened over the Internet to 3195# http://media.enet.cu/readioreloj 3196# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the 3197# the time was announced as "diez cinco" - the same time as here, indicating 3198# that has indeed switched to DST. Assume second Sunday from 2009 forward. 3199 3200# From Steffen Thorsen (2011-03-08): 3201# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00 3202# this year. Nothing about the end date known so far (if that has 3203# changed at all). 3204# 3205# Source: 3206# http://granma.co.cu/2011/03/08/nacional/artic01.html 3207# 3208# Our info: 3209# https://www.timeanddate.com/news/time/cuba-starts-dst-2011.html 3210# 3211# From Steffen Thorsen (2011-10-30) 3212# Cuba will end DST two weeks later this year. Instead of going back 3213# tonight, it has been delayed to 2011-11-13 at 01:00. 3214# 3215# One source (Spanish) 3216# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html 3217# 3218# Our page: 3219# https://www.timeanddate.com/news/time/cuba-time-changes-2011.html 3220# 3221# From Steffen Thorsen (2012-03-01) 3222# According to Radio Reloj, Cuba will start DST on Midnight between March 3223# 31 and April 1. 3224# 3225# Radio Reloj has the following info (Spanish): 3226# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril 3227# 3228# Our info on it: 3229# https://www.timeanddate.com/news/time/cuba-starts-dst-2012.html 3230 3231# From Steffen Thorsen (2012-11-03): 3232# Radio Reloj and many other sources report that Cuba is changing back 3233# to standard time on 2012-11-04: 3234# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre 3235# From Paul Eggert (2012-11-03): 3236# For now, assume the future rule is first Sunday in November. 3237 3238# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3239Rule Cuba 1928 only - Jun 10 0:00 1:00 D 3240Rule Cuba 1928 only - Oct 10 0:00 0 S 3241Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 3242Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 3243Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 3244Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 3245Rule Cuba 1965 only - Jun 1 0:00 1:00 D 3246Rule Cuba 1965 only - Sep 30 0:00 0 S 3247Rule Cuba 1966 only - May 29 0:00 1:00 D 3248Rule Cuba 1966 only - Oct 2 0:00 0 S 3249Rule Cuba 1967 only - Apr 8 0:00 1:00 D 3250Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 3251Rule Cuba 1968 only - Apr 14 0:00 1:00 D 3252Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 3253Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 3254Rule Cuba 1972 1974 - Oct 8 0:00 0 S 3255Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 3256Rule Cuba 1978 only - May 7 0:00 1:00 D 3257Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 3258Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 3259Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 3260Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 3261Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 3262Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 3263Rule Cuba 1996 only - Oct 6 0:00s 0 S 3264Rule Cuba 1997 only - Oct 12 0:00s 0 S 3265Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 3266Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 3267Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D 3268Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D 3269Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S 3270Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D 3271Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D 3272Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D 3273Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D 3274Rule Cuba 2011 only - Nov 13 0:00s 0 S 3275Rule Cuba 2012 only - Apr 1 0:00s 1:00 D 3276Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S 3277Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D 3278 3279# Zone NAME STDOFF RULES FORMAT [UNTIL] 3280Zone America/Havana -5:29:28 - LMT 1890 3281 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 3282 -5:00 Cuba C%sT 3283 3284# Dominican Republic 3285 3286# From Steffen Thorsen (2000-10-30): 3287# Enrique Morales reported to me that the Dominican Republic has changed the 3288# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 3289# http://www.listin.com.do/antes/261000/republica/princi.html 3290 3291# From Paul Eggert (2000-12-04): 3292# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 3293 3294# From Rives McDow (2000-12-01): 3295# Dominican Republic changed its mind and presidential decree on Tuesday, 3296# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 3297# Dominican Republic will be reverting to 8 hours from the International Date 3298# Line, and will not be using DST in the foreseeable future. The reason they 3299# decided to use DST was to be in synch with Puerto Rico, who was also going 3300# to implement DST. When Puerto Rico didn't implement DST, the president 3301# decided to revert. 3302 3303 3304# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3305Rule DR 1966 only - Oct 30 0:00 1:00 EDT 3306Rule DR 1967 only - Feb 28 0:00 0 EST 3307Rule DR 1969 1973 - Oct lastSun 0:00 0:30 -0430 3308Rule DR 1970 only - Feb 21 0:00 0 EST 3309Rule DR 1971 only - Jan 20 0:00 0 EST 3310Rule DR 1972 1974 - Jan 21 0:00 0 EST 3311# Zone NAME STDOFF RULES FORMAT [UNTIL] 3312Zone America/Santo_Domingo -4:39:36 - LMT 1890 3313 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 3314 -5:00 DR %s 1974 Oct 27 3315 -4:00 - AST 2000 Oct 29 2:00 3316 -5:00 US E%sT 2000 Dec 3 1:00 3317 -4:00 - AST 3318 3319# El Salvador 3320 3321# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3322Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 3323Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 3324# There are too many San Salvadors elsewhere, so use America/El_Salvador 3325# instead of America/San_Salvador. 3326# Zone NAME STDOFF RULES FORMAT [UNTIL] 3327Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 3328 -6:00 Salv C%sT 3329 3330# Guatemala 3331# 3332# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen: 3333# Diario Co Latino, at 3334# <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>, 3335# says in an article dated 2006-04-19 that the Guatemalan government had 3336# decided on that date to advance official time by 60 minutes, to lessen the 3337# impact of the elevated cost of oil.... Daylight saving time will last from 3338# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified). 3339# From Paul Eggert (2006-06-22): 3340# The Ministry of Energy and Mines, press release CP-15/2006 3341# (2006-04-19), says DST ends at 24:00. See 3342# http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf 3343 3344# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3345Rule Guat 1973 only - Nov 25 0:00 1:00 D 3346Rule Guat 1974 only - Feb 24 0:00 0 S 3347Rule Guat 1983 only - May 21 0:00 1:00 D 3348Rule Guat 1983 only - Sep 22 0:00 0 S 3349Rule Guat 1991 only - Mar 23 0:00 1:00 D 3350Rule Guat 1991 only - Sep 7 0:00 0 S 3351Rule Guat 2006 only - Apr 30 0:00 1:00 D 3352Rule Guat 2006 only - Oct 1 0:00 0 S 3353# Zone NAME STDOFF RULES FORMAT [UNTIL] 3354Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 3355 -6:00 Guat C%sT 3356 3357# Haiti 3358# From Gwillim Law (2005-04-15): 3359# Risto O. Nykänen wrote me that Haiti is now on DST. 3360# I searched for confirmation, and I found a press release 3361# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 3362# <http://www.haitianconsulate.org/time.doc>. Translated from French, it says: 3363# 3364# "The Prime Minister's Communication Office notifies the public in general 3365# and the press in particular that, following a decision of the Interior 3366# Ministry and the Territorial Collectivities [I suppose that means the 3367# provinces], Haiti will move to Eastern Daylight Time in the night from next 3368# Saturday the 2nd to Sunday the 3rd. 3369# 3370# "Consequently, the Prime Minister's Communication Office wishes to inform 3371# the population that the country's clocks will be set forward one hour 3372# starting at midnight. This provision will hold until the last Saturday in 3373# October 2005. 3374# 3375# "Port-au-Prince, March 31, 2005" 3376# 3377# From Steffen Thorsen (2006-04-04): 3378# I have been informed by users that Haiti observes DST this year like 3379# last year, so the current "only" rule for 2005 might be changed to a 3380# "max" rule or to last until 2006. (Who knows if they will observe DST 3381# next year or if they will extend their DST like US/Canada next year). 3382# 3383# I have found this article about it (in French): 3384# http://www.haitipressnetwork.com/news.cfm?articleID=7612 3385# 3386# The reason seems to be an energy crisis. 3387 3388# From Stephen Colebourne (2007-02-22): 3389# Some IATA info: Haiti won't be having DST in 2007. 3390 3391# From Steffen Thorsen (2012-03-11): 3392# According to several news sources, Haiti will observe DST this year, 3393# apparently using the same start and end date as USA/Canada. 3394# So this means they have already changed their time. 3395# 3396# http://www.alterpresse.org/spip.php?article12510 3397# http://radiovision2000haiti.net/home/?p=13253 3398# 3399# From Arthur David Olson (2012-03-11): 3400# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to 3401# 3:00 a.m. rather than the traditional Haitian jump at midnight. 3402# Assume a US-style fall back as well. 3403 3404# From Steffen Thorsen (2013-03-10): 3405# It appears that Haiti is observing DST this year as well, same rules 3406# as US/Canada. They did it last year as well, and it looks like they 3407# are going to observe DST every year now... 3408# 3409# http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/ 3410# http://www.canalplushaiti.net/?p=6714 3411 3412# From Steffen Thorsen (2016-03-12): 3413# Jean Antoine, editor of www.haiti-reference.com informed us that Haiti 3414# are not going on DST this year. Several other resources confirm this: ... 3415# https://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html 3416# https://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/ 3417# http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/ 3418 3419# From Steffen Thorsen (2017-03-12): 3420# We have received 4 mails from different people telling that Haiti 3421# has started DST again today, and this source seems to confirm that, 3422# I have not been able to find a more authoritative source: 3423# https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html 3424 3425# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3426Rule Haiti 1983 only - May 8 0:00 1:00 D 3427Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 3428Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 3429# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. 3430# Go with IATA. 3431Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 3432Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 3433Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D 3434Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S 3435Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D 3436Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S 3437Rule Haiti 2017 max - Mar Sun>=8 2:00 1:00 D 3438Rule Haiti 2017 max - Nov Sun>=1 2:00 0 S 3439# Zone NAME STDOFF RULES FORMAT [UNTIL] 3440Zone America/Port-au-Prince -4:49:20 - LMT 1890 3441 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 3442 -5:00 Haiti E%sT 3443 3444# Honduras 3445# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1. 3446 3447# From Paul Eggert (2006-05-05): 3448# worldtimezone.com reports a 2006-05-02 Spanish-language AP article 3449# saying Honduras will start using DST midnight Saturday, effective 4 3450# months until September. La Tribuna reported today 3451# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president 3452# of Honduras, refused to back down on this. 3453 3454# From Jesper Nørgaard Welen (2006-08-08): 3455# It seems that Honduras has returned from DST to standard time this Monday at 3456# 00:00 hours (prolonging Sunday to 25 hours duration). 3457# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html 3458 3459# From Paul Eggert (2006-08-08): 3460# Also see Diario El Heraldo, The country returns to standard time (2006-08-08). 3461# http://www.elheraldo.hn/nota.php?nid=54941&sec=12 3462# It mentions executive decree 18-2006. 3463 3464# From Steffen Thorsen (2006-08-17): 3465# Honduras will observe DST from 2007 to 2009, exact dates are not 3466# published, I have located this authoritative source: 3467# http://www.presidencia.gob.hn/noticia.aspx?nId=47 3468 3469# From Steffen Thorsen (2007-03-30): 3470# http://www.laprensahn.com/pais_nota.php?id04962=7386 3471# So it seems that Honduras will not enter DST this year.... 3472 3473# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3474Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D 3475Rule Hond 1987 1988 - Sep lastSun 0:00 0 S 3476Rule Hond 2006 only - May Sun>=1 0:00 1:00 D 3477Rule Hond 2006 only - Aug Mon>=1 0:00 0 S 3478# Zone NAME STDOFF RULES FORMAT [UNTIL] 3479Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 3480 -6:00 Hond C%sT 3481# 3482# Great Swan I ceded by US to Honduras in 1972 3483 3484# Jamaica 3485# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an 3486# unspecified official document, and says "This time is used throughout the 3487# island". Go with Milne. 3488# 3489# Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but 3490# Lance Neita writes that Prime Minister Michael Manley decreed it January 5. 3491# Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that 3492# Manley's supporters associated this act with Manley's nickname "Joshua" 3493# (recall that in the Bible the sun stood still at Joshua's request), 3494# and with the Rod of Correction which Manley said he had received from 3495# Haile Selassie, Emperor of Ethiopia. See: 3496# Neita L. The politician in all of us. Jamaica Observer 2014-09-20 3497# http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647 3498# 3499# Zone NAME STDOFF RULES FORMAT [UNTIL] 3500 #STDOFF -5:07:10.41 3501Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston 3502 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3503 -5:00 - EST 1974 3504 -5:00 US E%sT 1984 3505 -5:00 - EST 3506 3507# Martinique 3508# Zone NAME STDOFF RULES FORMAT [UNTIL] 3509Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 3510 -4:04:20 - FFMT 1911 May 1 # Fort-de-France MT 3511 -4:00 - AST 1980 Apr 6 3512 -4:00 1:00 ADT 1980 Sep 28 3513 -4:00 - AST 3514 3515# Nicaragua 3516# 3517# This uses Shanks & Pottenger for times before 2005. 3518# 3519# From Steffen Thorsen (2005-04-12): 3520# I've got reports from 8 different people that Nicaragua just started 3521# DST on Sunday 2005-04-10, in order to save energy because of 3522# expensive petroleum. The exact end date for DST is not yet 3523# announced, only "September" but some sites also say "mid-September". 3524# Some background information is available on the President's official site: 3525# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 3526# The Decree, no 23-2005 is available here: 3527# 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 3528# 3529# From Paul Eggert (2005-05-01): 3530# The decree doesn't say anything about daylight saving, but for now let's 3531# assume that it is daylight saving.... 3532# 3533# From Gwillim Law (2005-04-21): 3534# The Associated Press story on the time change, which can be found at 3535# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 3536# and elsewhere, says (fifth paragraph, translated from Spanish): "The last 3537# time that a change of clocks was applied to save energy was in the year 2000 3538# during the Arnoldo Alemán administration."... 3539# The northamerica file says that Nicaragua has been on UTC-6 continuously 3540# since December 1998. I wasn't able to find any details of Nicaraguan time 3541# changes in 2000. Perhaps a note could be added to the northamerica file, to 3542# the effect that we have indirect evidence that DST was observed in 2000. 3543# 3544# From Jesper Nørgaard Welen (2005-11-02): 3545# Nicaragua left DST the 2005-10-02 at 00:00 (local time). 3546# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm 3547# (2005-09-26) 3548# 3549# From Jesper Nørgaard Welen (2006-05-05): 3550# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410 3551# (my informal translation) 3552# By order of the president of the republic, Enrique Bolaños, Nicaragua 3553# advanced by sixty minutes their official time, yesterday at 2 in the 3554# morning, and will stay that way until 30th of September. 3555# 3556# From Jesper Nørgaard Welen (2006-09-30): 3557# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf 3558# My informal translation runs: 3559# The natural sun time is restored in all the national territory, in that the 3560# time is returned one hour at 01:00 am of October 1 of 2006. 3561# 3562# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3563Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 3564Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 3565Rule Nic 2005 only - Apr 10 0:00 1:00 D 3566Rule Nic 2005 only - Oct Sun>=1 0:00 0 S 3567Rule Nic 2006 only - Apr 30 2:00 1:00 D 3568Rule Nic 2006 only - Oct Sun>=1 1:00 0 S 3569# Zone NAME STDOFF RULES FORMAT [UNTIL] 3570Zone America/Managua -5:45:08 - LMT 1890 3571 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 3572 -6:00 - CST 1973 May 3573 -5:00 - EST 1975 Feb 16 3574 -6:00 Nic C%sT 1992 Jan 1 4:00 3575 -5:00 - EST 1992 Sep 24 3576 -6:00 - CST 1993 3577 -5:00 - EST 1997 3578 -6:00 Nic C%sT 3579 3580# Cayman Is 3581# Panama 3582# 3583# Atikokan and Coral Harbour, Canada, match Panama since 1970. 3584# Zone NAME STDOFF RULES FORMAT [UNTIL] 3585Zone America/Panama -5:18:08 - LMT 1890 3586 -5:19:36 - CMT 1908 Apr 22 # Colón Mean Time 3587 -5:00 - EST 3588 3589# Anguilla 3590# Antigua & Barbuda 3591# Aruba 3592# Caribbean Netherlands 3593# Curaçao 3594# Dominica 3595# Grenada 3596# Guadeloupe 3597# Montserrat 3598# Puerto Rico 3599# St Barthélemy 3600# St Kitts-Nevis 3601# Sint Maarten / St Martin 3602# St Lucia 3603# St Vincent & the Grenadines 3604# Trinidad & Tobago 3605# Virgin Is (UK & US) 3606# 3607# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'. 3608# Zone NAME STDOFF RULES FORMAT [UNTIL] 3609Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 3610 -4:00 - AST 1942 May 3 3611 -4:00 US A%sT 1946 3612 -4:00 - AST 3613 3614# St Pierre and Miquelon 3615# There are too many St Pierres elsewhere, so we'll use 'Miquelon'. 3616# Zone NAME STDOFF RULES FORMAT [UNTIL] 3617Zone America/Miquelon -3:44:40 - LMT 1911 Jun 15 # St Pierre 3618 -4:00 - AST 1980 May 3619 -3:00 - %z 1987 3620 -3:00 Canada %z 3621 3622# Turks and Caicos 3623# 3624# From Chris Dunn in 3625# https://bugs.debian.org/415007 3626# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the 3627# daylight saving dates for time changes have been adjusted to match 3628# the recent U.S. change of dates. 3629# 3630# From Brian Inglis (2007-04-28): 3631# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26] 3632# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three 3633# rows before that there is an out of date entry for Oct: 3634# "Eastern Standard Times Begins 2007 3635# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time" 3636# indicating that the normal ET rules are followed. 3637 3638# From Paul Eggert (2014-08-19): 3639# The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See: 3640# http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm 3641# Model this as a switch from EST/EDT to AST ... 3642# From Chris Walton (2014-11-04): 3643# ... the TCI government appears to have delayed the switch to 3644# "permanent daylight saving time" by one year.... 3645# http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm 3646# 3647# From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen: 3648# ... agreed to the reintroduction in TCI of Daylight Saving Time (DST) 3649# during the summer months and Standard Time, also known as Local 3650# Time, during the winter months with effect from April 2018 ... 3651# https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3 3652# From Paul Eggert (2017-08-26): 3653# The date of effect of the spring 2018 change appears to be March 11, 3654# which makes more sense. See: Hamilton D. Time change back 3655# by March 2018 for TCI. Magnetic Media. 2017-08-25. 3656# http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/ 3657# 3658# From P Chan (2020-11-27): 3659# Standard Time Declaration Order 2015 (L.N. 15/2015) 3660# http://online.fliphtml5.com/fizd/czin/#p=2 3661# 3662# Standard Time Declaration Order 2017 (L.N. 31/2017) 3663# http://online.fliphtml5.com/fizd/dmcu/#p=2 3664# 3665# From Tim Parenti (2020-12-05): 3666# Although L.N. 31/2017 reads that it "shall come into operation at 2:00 a.m. 3667# on 11th March 2018", a precise interpretation here poses some problems. The 3668# order states that "the standard time to be observed throughout the Turks and 3669# Caicos Islands shall be the same time zone as the Eastern United States of 3670# America" and further clarifies "[f]or the avoidance of doubt" that it 3671# "applies to the Eastern Standard Time as well as any changes thereto for 3672# Daylight Saving Time." However, as clocks in Turks and Caicos approached 3673# 02:00 -04, and thus the declared implementation time, it was still 01:00 EST 3674# (-05), as DST in the Eastern US would not start until an hour later. 3675# 3676# Since it is unlikely that those on the islands switched their clocks twice in 3677# the span of an hour, we assume instead that the adoption of EDT actually took 3678# effect once clocks in the Eastern US had sprung forward, from 03:00 -04. 3679# This discrepancy only affects the time zone abbreviation and DST flag for the 3680# intervening hour, not wall clock times, as -04 was maintained throughout. 3681 3682# Zone NAME STDOFF RULES FORMAT [UNTIL] 3683Zone America/Grand_Turk -4:44:32 - LMT 1890 3684 #STDOFF -5:07:10.41 3685 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3686 -5:00 - EST 1979 3687 -5:00 US E%sT 2015 Mar 8 2:00 3688 -4:00 - AST 2018 Mar 11 3:00 3689 -5:00 US E%sT 3690 3691# Local Variables: 3692# coding: utf-8 3693# End: 3694