1# $OpenBSD: northamerica,v 1.86 2024/02/05 17:07:23 millert Exp $ 2# tzdb data for North and Central America and environs 3 4# This file is in the public domain, so clarified as of 5# 2009-05-17 by Arthur David Olson. 6 7# also includes Central America and the Caribbean 8 9# This file is by no means authoritative; if you think you know better, 10# go ahead and edit the file (and please send any changes to 11# tz@iana.org for general use in the future). For more, please see 12# the file CONTRIBUTING in the tz distribution. 13 14# From Paul Eggert (1999-03-22): 15# A reliable and entertaining source about time zones is 16# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 17 18############################################################################### 19 20# United States 21 22# From Paul Eggert (1999-03-31): 23# Howse writes (pp 121-125) that time zones were invented by 24# Professor Charles Ferdinand Dowd (1825-1904), 25# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 26# His pamphlet "A System of National Time for Railroads" (1870) 27# was the result of his proposals at the Convention of Railroad Trunk Lines 28# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 29# but in 1872-05 he moved the proposed origin to Greenwich. 30 31# From Paul Eggert (2018-03-20): 32# Dowd's proposal left many details unresolved, such as where to draw 33# lines between time zones. The key individual who made time zones 34# work in the US was William Frederick Allen - railway engineer, 35# managing editor of the Travelers' Guide, and secretary of the 36# General Time Convention, a railway standardization group. Allen 37# spent months in dialogs with scientific and railway leaders, 38# developed a workable plan to institute time zones, and presented it 39# to the General Time Convention on 1883-04-11, saying that his plan 40# meant "local time would be practically abolished" - a plus for 41# railway scheduling. By the next convention on 1883-10-11 nearly all 42# railroads had agreed and it took effect on 1883-11-18. That Sunday 43# was called the "day of two noons", as some locations observed noon 44# twice. Allen witnessed the transition in New York City, writing: 45# 46# I heard the bells of St. Paul's strike on the old time. Four 47# minutes later, obedient to the electrical signal from the Naval 48# Observatory ... the time-ball made its rapid descent, the chimes 49# of old Trinity rang twelve measured strokes, and local time was 50# abandoned, probably forever. 51# 52# Most of the US soon followed suit. See: 53# Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56. 54# https://dx.doi.org/10.2307/3105430 55 56# From Paul Eggert (2005-04-16): 57# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 58# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 59 60# From Paul Eggert (2006-03-22): 61# A good source for time zone historical data in the US is 62# Thomas G. Shanks, The American Atlas (5th edition), 63# San Diego: ACS Publications, Inc. (1991). 64# Make sure you have the errata sheet; the book is somewhat useless without it. 65# It is the source for most of the pre-1991 US entries below. 66 67# From Paul Eggert (2001-03-06): 68# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 69# in his whimsical essay "An Economical Project for Diminishing the Cost 70# of Light" published in the Journal de Paris (1784-04-26). 71# Not everyone is happy with the results: 72# 73# I don't really care how time is reckoned so long as there is some 74# agreement about it, but I object to being told that I am saving 75# daylight when my reason tells me that I am doing nothing of the kind. 76# I even object to the implication that I am wasting something 77# valuable if I stay in bed after the sun has risen. As an admirer 78# of moonlight I resent the bossy insistence of those who want to 79# reduce my time for enjoying it. At the back of the Daylight Saving 80# scheme I detect the bony, blue-fingered hand of Puritanism, eager 81# to push people into bed earlier, and get them up earlier, to make 82# them healthy, wealthy and wise in spite of themselves. 83# 84# -- Robertson Davies, The diary of Samuel Marchbanks, 85# Clarke, Irwin (1947), XIX, Sunday 86# 87# For more about the first ten years of DST in the United States, see 88# Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint 89# (Carnegie Library of Pittsburgh, 1927). 90# https://web.archive.org/web/20160517155308/http://www.clpgh.org/exhibit/dst.html 91# 92# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 93# However, DST was imposed by the Standard Time Act of 1918, which 94# was the first nationwide legal time standard, and apparently 95# time was just called "Standard Time" or "Daylight Saving Time". 96 97# From Paul Eggert (2019-06-04): 98# Here is the legal basis for the US federal rules. 99# * Public Law 65-106 (1918-03-19) implemented standard and daylight saving 100# time for the first time across the US, springing forward on March's last 101# Sunday and falling back on October's last Sunday. 102# https://www.loc.gov/law/help/statutes-at-large/65th-congress/session-2/c65s2ch24.pdf 103# * Public Law 66-40 (1919-08-20) repealed DST on October 1919's last Sunday. 104# https://www.loc.gov/law/help/statutes-at-large/66th-congress/session-1/c66s1ch51.pdf 105# * Public Law 77-403 (1942-01-20) started wartime DST on 1942-02-09. 106# https://www.loc.gov/law/help/statutes-at-large/77th-congress/session-2/c77s2ch7.pdf 107# * Public Law 79-187 (1945-09-25) ended wartime DST on 1945-09-30. 108# https://www.loc.gov/law/help/statutes-at-large/79th-congress/session-1/c79s1ch388.pdf 109# * Public Law 89-387 (1966-04-13) reinstituted a national standard for DST, 110# from April's last Sunday to October's last Sunday, effective 1967. 111# https://www.govinfo.gov/content/pkg/STATUTE-80/pdf/STATUTE-80-Pg107.pdf 112# * Public Law 93-182 (1973-12-15) moved the 1974 spring-forward to 01-06. 113# https://www.govinfo.gov/content/pkg/STATUTE-87/pdf/STATUTE-87-Pg707.pdf 114# * Public Law 93-434 (1974-10-05) moved the 1975 spring-forward to 115# February's last Sunday. 116# https://www.govinfo.gov/content/pkg/STATUTE-88/pdf/STATUTE-88-Pg1209.pdf 117# * Public Law 99-359 (1986-07-08) moved the spring-forward to April's first 118# Sunday. 119# https://www.govinfo.gov/content/pkg/STATUTE-100/pdf/STATUTE-100-Pg764.pdf 120# * Public Law 109-58 (2005-08-08), effective 2007, moved the spring-forward 121# to March's second Sunday and the fall-back to November's first Sunday. 122# https://www.govinfo.gov/content/pkg/PLAW-109publ58/pdf/PLAW-109publ58.pdf 123# All transitions are at 02:00 local time. 124 125# From Arthur David Olson: 126# Before the Uniform Time Act of 1966 took effect in 1967, observance of 127# Daylight Saving Time in the US was by local option, except during wartime. 128 129# From Arthur David Olson (2000-09-25): 130# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 131# In the introduction, Oboler spoke of "Eastern Peace Time." 132# An AltaVista search turned up: 133# https://web.archive.org/web/20000926032210/http://rowayton.org/rhs/hstaug45.html 134# "When the time is announced over the radio now, it is 'Eastern Peace 135# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 136# (August 1945) by way of confirmation. 137# 138# From Paul Eggert (2017-09-23): 139# This was the V-J Day issue of the Clamdigger, a Rowayton, CT newsletter. 140 141# From Joseph Gallant citing 142# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 143# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 144# to switch to London for Attlee's address, but the American people 145# never got to hear his speech live. According to one press account, 146# CBS' Bob Trout was first to announce the word of Japan's surrender, 147# but a few seconds later, NBC, ABC and Mutual also flashed the word 148# of surrender, all of whom interrupting the bells of Big Ben in 149# London which were to precede Mr. Attlee's speech. 150 151# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 152# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 153# 154# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 155# Any announcement from Asia would reach St. John's New York newsroom on a 156# wire service teletype machine, which had prescribed signals for major news. 157# Associated Press, for example, would ring five bells before spewing out 158# typed copy of an important story, and 10 bells for news "of transcendental 159# importance." 160# 161# On Aug. 14, stalling while talking steadily into the NBC networks' open 162# microphone, St. John heard five bells and waited only to hear a sixth bell, 163# before announcing confidently: "Ladies and gentlemen, World War II is over. 164# The Japanese have agreed to our surrender terms." 165# 166# He had scored a 20-second scoop on other broadcasters. 167 168# From Arthur David Olson (2005-08-22): 169# Paul has been careful to use the "US" rules only in those locations 170# that are part of the United States; this reflects the real scope of 171# U.S. government action. So even though the "US" rules have changed 172# in the latest release, other countries won't be affected. 173 174# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 175Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 176Rule US 1918 1919 - Oct lastSun 2:00 0 S 177Rule US 1942 only - Feb 9 2:00 1:00 W # War 178Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 179Rule US 1945 only - Sep 30 2:00 0 S 180Rule US 1967 2006 - Oct lastSun 2:00 0 S 181Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 182Rule US 1974 only - Jan 6 2:00 1:00 D 183Rule US 1975 only - Feb lastSun 2:00 1:00 D 184Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 185Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 186Rule US 2007 max - Mar Sun>=8 2:00 1:00 D 187Rule US 2007 max - Nov Sun>=1 2:00 0 S 188 189# From Arthur David Olson, 2005-12-19 190# We generate the files specified below to guard against old files with 191# obsolete information being left in the time zone binary directory. 192# We limit the list to names that have appeared in previous versions of 193# this time zone package. 194# We do these as separate Zones rather than as Links to avoid problems if 195# a particular place changes whether it observes DST. 196# We put these specifications here in the northamerica file both to 197# increase the chances that they'll actually get compiled and to 198# avoid the need to duplicate the US rules in another file. 199 200# Zone NAME STDOFF RULES FORMAT [UNTIL] 201Zone EST -5:00 - EST 202Zone MST -7:00 - MST 203Zone HST -10:00 - HST 204Zone EST5EDT -5:00 US E%sT 205Zone CST6CDT -6:00 US C%sT 206Zone MST7MDT -7:00 US M%sT 207Zone PST8PDT -8:00 US P%sT 208 209# From U. S. Naval Observatory (1989-01-19): 210# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 211# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 212# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 213# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 214# USA MOUNTAIN 7 H BEHIND UTC DENVER 215# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 216# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 217# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 218# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 219# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 220# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 221# USA " 9 H BEHIND UTC APR 3 - OCT 30 222# USA HAWAII 10 H BEHIND UTC 223# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 224 225# From Arthur David Olson (1989-01-21): 226# The above dates are for 1988. 227# Note the "AKST" and "AKDT" abbreviations, the claim that there's 228# no DST in Samoa, and the claim that there is DST in Alaska and the 229# Aleutians. 230 231# From Arthur David Olson (1988-02-13): 232# Legal standard time zone names, from United States Code (1982 Edition and 233# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 234# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 235# took effect), as explained in sections 263 and 261: 236# (none) 237# United States standard eastern time 238# United States standard mountain time 239# United States standard central time 240# United States standard Pacific time 241# (none) 242# United States standard Alaska time 243# (none) 244# Next, names from 1967-04-01 until 1983-11-30 (the date for 245# public law 98-181): 246# Atlantic standard time 247# eastern standard time 248# central standard time 249# mountain standard time 250# Pacific standard time 251# Yukon standard time 252# Alaska-Hawaii standard time 253# Bering standard time 254# And after 1983-11-30: 255# Atlantic standard time 256# eastern standard time 257# central standard time 258# mountain standard time 259# Pacific standard time 260# Alaska standard time 261# Hawaii-Aleutian standard time 262# Samoa standard time 263# The law doesn't give abbreviations. 264# 265# From Paul Eggert (2016-12-19): 266# Here are URLs for the 1918 and 1966 legislation: 267# http://uscode.house.gov/statviewer.htm?volume=40&page=451 268# http://uscode.house.gov/statviewer.htm?volume=80&page=108 269# Although the 1918 names were officially "United States Standard 270# Eastern Time" and similarly for "Central", "Mountain", "Pacific", 271# and "Alaska", in practice "Standard" was placed just before "Time", 272# as codified in 1966. In practice, Alaska time was abbreviated "AST" 273# before 1968. Summarizing the 1967 name changes: 274# 1918 names 1967 names 275# -08 Standard Pacific Time (PST) Pacific standard time (PST) 276# -09 (unofficial) Yukon (YST) Yukon standard time (YST) 277# -10 Standard Alaska Time (AST) Alaska-Hawaii standard time (AHST) 278# -11 (unofficial) Nome (NST) Bering standard time (BST) 279# 280# From Paul Eggert (2023-01-23), from a 2001-01-08 heads-up from Rives McDow: 281# Public law 106-564 (2000-12-23) introduced "Chamorro standard time" 282# for time in Guam and the Northern Marianas. See the file "australasia". 283# Also see 15 U.S.C. ��263 <https://www.law.cornell.edu/uscode/text/15/263>. 284# 285# From Paul Eggert (2015-04-17): 286# HST and HDT are standardized abbreviations for Hawaii-Aleutian 287# standard and daylight times. See section 9.47 (p 234) of the 288# U.S. Government Printing Office Style Manual (2008) 289# https://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf 290 291# From Arthur David Olson, 2005-08-09 292# The following was signed into law on 2005-08-08. 293# 294# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 295# (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15 296# U.S.C. 260a(a)) is amended-- 297# (1) by striking "first Sunday of April" and inserting "second 298# Sunday of March"; and 299# (2) by striking "last Sunday of October" and inserting "first 300# Sunday of November'. 301# (b) Effective Date.--Subsection (a) shall take effect 1 year after the 302# date of enactment of this Act or March 1, 2007, whichever is later. 303# (c) Report to Congress.--Not later than 9 months after the effective 304# date stated in subsection (b), the Secretary shall report to Congress 305# on the impact of this section on energy consumption in the United 306# States. 307# (d) Right to Revert.--Congress retains the right to revert the 308# Daylight Saving Time back to the 2005 time schedules once the 309# Department study is complete. 310 311# US eastern time, represented by New York 312 313# Connecticut, Delaware, District of Columbia, most of Florida, 314# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky 315# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, 316# New Hampshire, New Jersey, New York, North Carolina, Ohio, 317# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 318# Vermont, Virginia, West Virginia 319 320# From Dave Cantor (2004-11-02): 321# Early this summer I had the occasion to visit the Mount Washington 322# Observatory weather station atop (of course!) Mount Washington [, NH].... 323# One of the staff members said that the station was on Eastern Standard Time 324# and didn't change their clocks for Daylight Saving ... so that their 325# reports will always have times which are 5 hours behind UTC. 326 327# From Paul Eggert (2005-08-26): 328# According to today's Huntsville Times 329# http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1 330# a few towns on Alabama's "eastern border with Georgia, such as Phenix City 331# in Russell County, Lanett in Chambers County and some towns in Lee County, 332# set their watches and clocks on Eastern time." It quotes H.H. "Bubba" 333# Roberts, city administrator in Phenix City. as saying "We are in the Central 334# time zone, but we do go by the Eastern time zone because so many people work 335# in Columbus." 336# 337# From Paul Eggert (2017-02-22): 338# Four cities are involved. The two not mentioned above are Smiths Station 339# and Valley. Barbara Brooks, Valley's assistant treasurer, heard it started 340# because West Point Pepperell textile mills were in Alabama while the 341# corporate office was in Georgia, and residents voted to keep Eastern 342# time even after the mills closed. See: Kazek K. Did you know which 343# Alabama towns are in a different time zone? al.com 2017-02-06. 344# http://www.al.com/living/index.ssf/2017/02/do_you_know_which_alabama_town.html 345 346# From Paul Eggert (2014-09-06): 347# Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208 348# says that New York City Hall time was 3 minutes 58.4 seconds fast of 349# Eastern time (i.e., -4:56:01.6) just before the 1883 switch. 350 351# Rule NAME FROM TO - IN ON AT SAVE LETTER 352Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 353Rule NYC 1920 only - Oct lastSun 2:00 0 S 354Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 355Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 356Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 357# Zone NAME STDOFF RULES FORMAT [UNTIL] 358 #STDOFF -4:56:01.6 359Zone America/New_York -4:56:02 - LMT 1883 Nov 18 17:00u 360 -5:00 US E%sT 1920 361 -5:00 NYC E%sT 1942 362 -5:00 US E%sT 1946 363 -5:00 NYC E%sT 1967 364 -5:00 US E%sT 365 366# US central time, represented by Chicago 367 368# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 369# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 370# Washington counties), Illinois, western Indiana 371# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 372# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 373# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 374# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 375# western Tennessee, most of Texas, Wisconsin 376 377# From Paul Eggert (2018-01-07): 378# In 1869 the Chicago Astronomical Society contracted with the city to keep 379# time. Though delayed by the Great Fire, by 1880 a wire ran from the 380# Dearborn Observatory (on the University of Chicago campus) to City Hall, 381# which then sent signals to police and fire stations. However, railroads got 382# their time signals from the Allegheny Observatory, the Madison Observatory, 383# the Ann Arbor Observatory, etc., so their clocks did not agree with each 384# other or with the city's official time. The confusion took some years to 385# clear up. See: 386# Moser M. How Chicago gave America its time zones. Chicago. 2018-01-04. 387# http://www.chicagomag.com/city-life/January-2018/How-Chicago-Gave-America-Its-Time-Zones/ 388 389# From Larry M. Smith (2006-04-26) re Wisconsin: 390# https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf 391# is currently enforced at the 01:00 time of change. Because the local 392# "bar time" in the state corresponds to 02:00, a number of citations 393# are issued for the "sale of class 'B' alcohol after prohibited 394# hours" within the deviated hour of this change every year.... 395# 396# From Douglas R. Bomberg (2007-03-12): 397# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI 398# Statue 175 closer in synch with the US Congress' intent.... 399# https://docs.legis.wisconsin.gov/2007/related/acts/3 400 401# From an email administrator of the City of Fort Pierre, SD (2015-12-21): 402# Fort Pierre is technically located in the Mountain time zone as is 403# the rest of Stanley County. Most of Stanley County and Fort Pierre 404# uses the Central time zone due to doing most of their business in 405# Pierre so it simplifies schedules. I have lived in Stanley County 406# all my life and it has been that way since I can remember. (43 years!) 407# 408# From Paul Eggert (2015-12-25): 409# Assume this practice predates 1970, so Fort Pierre can use America/Chicago. 410 411# From Paul Eggert (2015-04-06): 412# In 1950s Nashville a public clock had dueling faces, one for conservatives 413# and the other for liberals; the two sides didn't agree about the time of day. 414# I haven't found a photo of this clock, nor have I tracked down the TIME 415# magazine report cited below, but here's the story as told by the late 416# American journalist John Seigenthaler, who was there: 417# 418# "The two [newspaper] owners held strongly contrasting political and 419# ideological views. Evans was a New South liberal, Stahlman an Old South 420# conservative, and their two papers frequently clashed editorially, often on 421# the same day.... In the 1950s as the state legislature was grappling with 422# the question of whether to approve daylight saving time for the entire state, 423# TIME magazine reported: 424# 425# "'The Nashville Banner and The Nashville Tennessean rarely agree on anything 426# but the time of day - and last week they couldn't agree on that.' 427# 428# "It was all too true. The clock on the front of the building had two faces - 429# The Tennessean side of the building facing west, the other, east. When it 430# was high noon Banner time, it was 11 a.m. Tennessean time." 431# 432# Seigenthaler J. For 100 years, Tennessean had it covered. 433# The Tennessean 2007-05-11, republished 2015-04-06. 434# https://www.tennessean.com/story/insider/extras/2015/04/06/archives-seigenthaler-for-100-years-the-tennessean-had-it-covered/25348545/ 435 436# Rule NAME FROM TO - IN ON AT SAVE LETTER 437Rule Chicago 1920 only - Jun 13 2:00 1:00 D 438Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 439Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 440Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 441Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 442Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 443# Zone NAME STDOFF RULES FORMAT [UNTIL] 444Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 18:00u 445 -6:00 US C%sT 1920 446 -6:00 Chicago C%sT 1936 Mar 1 2:00 447 -5:00 - EST 1936 Nov 15 2:00 448 -6:00 Chicago C%sT 1942 449 -6:00 US C%sT 1946 450 -6:00 Chicago C%sT 1967 451 -6:00 US C%sT 452# Oliver County, ND switched from mountain to central time on 1992-10-25. 453Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 19:00u 454 -7:00 US M%sT 1992 Oct 25 2:00 455 -6:00 US C%sT 456# Morton County, ND, switched from mountain to central time on 457# 2003-10-26, except for the area around Mandan which was already central time. 458# See <http://dmses.dot.gov/docimages/p63/135818.pdf>. 459# Officially this switch also included part of Sioux County, and 460# Jones, Mellette, and Todd Counties in South Dakota; 461# but in practice these other counties were already observing central time. 462# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>. 463Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 19:00u 464 -7:00 US M%sT 2003 Oct 26 2:00 465 -6:00 US C%sT 466 467# From Josh Findley (2011-01-21): 468# ...it appears that Mercer County, North Dakota, changed from the 469# mountain time zone to the central time zone at the last transition from 470# daylight-saving to standard time (on Nov. 7, 2010): 471# https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm 472# http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html 473 474# From Andy Lipscomb (2011-01-24): 475# ...according to the Census Bureau, the largest city is Beulah (although 476# it's commonly referred to as Beulah-Hazen, with Hazen being the next 477# largest city in Mercer County). Google Maps places Beulah's city hall 478# at 47�� 15' 51" N, 101�� 46' 40" W, which yields an offset of 6h47'07". 479 480Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 19:00u 481 -7:00 US M%sT 2010 Nov 7 2:00 482 -6:00 US C%sT 483 484# US mountain time, represented by Denver 485# 486# Colorado, far western Kansas, Montana, western 487# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 488# New Mexico, southwestern North Dakota, 489# western South Dakota, far western Texas (El Paso County, Hudspeth County, 490# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 491# 492# From Paul Eggert (2018-10-25): 493# On 1921-03-04 federal law placed all of Texas into the central time zone. 494# However, El Paso ignored the law for decades and continued to observe 495# mountain time, on the grounds that that's what they had always done 496# and they weren't about to let the federal government tell them what to do. 497# Eventually the federal government gave in and changed the law on 498# 1970-04-10 to match what El Paso was actually doing. Although 499# that's slightly after our 1970 cutoff, there is no need to create a 500# separate zone for El Paso since they were ignoring the law anyway. See: 501# Long T. El Pasoans were time rebels, fought to stay in Mountain zone. 502# El Paso Times. 2018-10-24 06:40 -06. 503# https://www.elpasotimes.com/story/news/local/el-paso/2018/10/24/el-pasoans-were-time-rebels-fought-stay-mountain-zone/1744509002/ 504# 505# Rule NAME FROM TO - IN ON AT SAVE LETTER 506Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 507Rule Denver 1920 only - Oct lastSun 2:00 0 S 508Rule Denver 1921 only - May 22 2:00 0 S 509Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 510Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 511# Zone NAME STDOFF RULES FORMAT [UNTIL] 512Zone America/Denver -6:59:56 - LMT 1883 Nov 18 19:00u 513 -7:00 US M%sT 1920 514 -7:00 Denver M%sT 1942 515 -7:00 US M%sT 1946 516 -7:00 Denver M%sT 1967 517 -7:00 US M%sT 518 519# US Pacific time, represented by Los Angeles 520# 521# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 522# Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county 523# north of the Salmon River, and the towns of Burgdorf and Warren), 524# Nevada (except West Wendover), Oregon (except the northern �� of 525# Malheur county), and Washington 526 527# From Paul Eggert (2016-08-20): 528# In early February 1948, in response to California's electricity shortage, 529# PG&E changed power frequency from 60 to 59.5 Hz during daylight hours, 530# causing electric clocks to lose six minutes per day. (This did not change 531# legal time, and is not part of the data here.) See: 532# Ross SA. An energy crisis from the past: Northern California in 1948. 533# Working Paper No. 8, Institute of Governmental Studies, UC Berkeley, 534# 1973-11. https://escholarship.org/uc/item/8x22k30c 535# 536# In another measure to save electricity, DST was instituted from 1948-03-14 537# at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move 538# the fallback transition earlier. See pages 3-4 of: 539# http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf 540# 541# In response: 542# 543# Governor Warren received a torrent of objecting mail, and it is not too much 544# to speculate that the objections to Daylight Saving Time were one important 545# factor in the defeat of the Dewey-Warren Presidential ticket in California. 546# -- Ross, p 25 547# 548# On December 8 the governor exercised the option, setting the date to January 1 549# (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01). 550# 551# Despite the controversy, in 1949 California voters approved Proposition 12, 552# which established DST from April's last Sunday at 01:00 until September's 553# last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed 554# the fall-back date to October's last Sunday. See: 555# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props 556# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props 557# 558# Rule NAME FROM TO - IN ON AT SAVE LETTER 559Rule CA 1948 only - Mar 14 2:01 1:00 D 560Rule CA 1949 only - Jan 1 2:00 0 S 561Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D 562Rule CA 1950 1961 - Sep lastSun 2:00 0 S 563Rule CA 1962 1966 - Oct lastSun 2:00 0 S 564# Zone NAME STDOFF RULES FORMAT [UNTIL] 565Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 20:00u 566 -8:00 US P%sT 1946 567 -8:00 CA P%sT 1967 568 -8:00 US P%sT 569 570# Alaska 571# AK%sT is the modern abbreviation for -09 per USNO. 572# 573# From Paul Eggert (2017-06-15): 574# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 575# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 576# On Friday, 1867-10-18 (Gregorian), at precisely 15:30 local time, the 577# Russian forts and fleet at Sitka fired salutes to mark the ceremony of 578# formal transfer. See the Sacramento Daily Union (1867-11-14), p 3, col 2. 579# https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SDU18671114.2.12.1 580# Sitka workers did not change their calendars until Sunday, 1867-10-20, 581# and so celebrated two Sundays that week. See: Ahllund T (tr Hallamaa P). 582# From the memoirs of a Finnish workman. Alaska History. 2006 Fall;21(2):1-25. 583# http://alaskahistoricalsociety.org/wp-content/uploads/2016/12/Ahllund-2006-Memoirs-of-a-Finnish-Workman.pdf 584# Include only the time zone part of this transition, ignoring the switch 585# from Julian to Gregorian, since we can't represent the Julian calendar. 586# 587# As far as we know, of the locations mentioned below only Sitka was 588# permanently inhabited in 1867 by anyone using either calendar. 589# (Yakutat was colonized by the Russians in 1799, but the settlement was 590# destroyed in 1805 by a Yakutat-kon war party.) Many of Alaska's inhabitants 591# were unaware of the US acquisition of Alaska, much less of any calendar or 592# time change. However, the Russian-influenced part of Alaska did observe 593# Russian time, and it is more accurate to model this than to ignore it. 594# The database format requires an exact transition time; use the Russian 595# salute as a somewhat-arbitrary time for the formal transfer of control for 596# all of Alaska. Sitka's UTC offset is -9:01:13; adjust its 15:30 to the 597# local times of other Alaskan locations so that they change simultaneously. 598 599# From Paul Eggert (2014-07-18): 600# One opinion of the early 1980s turmoil in Alaska over time zones and 601# daylight saving time appeared as graffiti on a Juneau airport wall: 602# "Welcome to Juneau. Please turn your watch back to the 19th century." 603# See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01. 604# http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html 605# 606# Steve Ferguson (2011-01-31) referred to the following source: 607# Norris F. Keeping time in Alaska: national directives, local response. 608# Alaska History 2001;16(1-2). 609# http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/ 610 611# From Arthur David Olson (2011-02-01): 612# Here's database-relevant material from the 2001 "Alaska History" article: 613# 614# On September 20 [1979]...DOT...officials decreed that on April 27, 615# 1980, Juneau and other nearby communities would move to Yukon Time. 616# Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on 617# Pacific Time. 618# 619# ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the 620# Department's September 1979 decision. Juneau and other communities in 621# northern Southeast reverted to Pacific Time on October 26. 622# 623# On October 28 [1983]...the Metlakatla Indian Community Council voted 624# unanimously to keep the reservation on Pacific Time. 625# 626# According to DOT official Joanne Petrie, Indian reservations are not 627# bound to follow time zones imposed by neighboring jurisdictions. 628# 629# (The last is consistent with how the database now handles the Navajo 630# Nation.) 631 632# From Arthur David Olson (2011-02-09): 633# I just spoke by phone with a staff member at the Metlakatla Indian 634# Community office (using contact information available at 635# http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla 636# It's shortly after 1:00 here on the east coast of the United States; 637# the staffer said it was shortly after 10:00 there. When I asked whether 638# that meant they were on Pacific time, they said no - they were on their 639# own time. I asked about daylight saving; they said it wasn't used. I 640# did not inquire about practices in the past. 641 642# From Arthur David Olson (2011-08-17): 643# For lack of better information, assume that Metlakatla's 644# abandonment of use of daylight saving resulted from the 1983 vote. 645 646# From Steffen Thorsen (2015-11-09): 647# It seems Metlakatla did go off PST on Sunday, November 1, changing 648# their time to AKST and are going to follow Alaska's DST, switching 649# between AKST and AKDT from now on.... 650# https://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/ 651 652# From Ryan Stanley (2018-11-06): 653# The Metlakatla community in Alaska has decided not to change its 654# clock back an hour starting on November 4th, 2018 (day before yesterday). 655# They will be gmtoff=-28800 year-round. 656# https://www.facebook.com/141055983004923/photos/pb.141055983004923.-2207520000.1541465673./569081370202380/ 657 658# From Paul Eggert (2018-12-16): 659# In a 2018-12-11 special election, Metlakatla voted to go back to 660# Alaska time (including daylight saving time) starting next year. 661# https://www.krbd.org/2018/12/12/metlakatla-to-follow-alaska-standard-time-allow-liquor-sales/ 662# 663# From Ryan Stanley (2019-01-11): 664# The community will be changing back on the 20th of this month... 665# From Tim Parenti (2019-01-11): 666# Per an announcement on the Metlakatla community's official Facebook page, the 667# "fall back" will be on Sunday 2019-01-20 at 02:00: 668# https://www.facebook.com/141055983004923/photos/607150969728753/ 669# So they won't be waiting for Alaska to join them on 2019-03-10, but will 670# rather change their clocks twice in seven weeks. 671 672# From Paul Eggert (2023-01-23): 673# America/Adak is for the Aleutian Islands that are part of Alaska 674# and are west of 169.5�� W. 675 676# Zone NAME STDOFF RULES FORMAT [UNTIL] 677Zone America/Juneau 15:02:19 - LMT 1867 Oct 19 15:33:32 678 -8:57:41 - 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 1980 Apr 27 2:00 683 -9:00 US Y%sT 1980 Oct 26 2:00 684 -8:00 US P%sT 1983 Oct 30 2:00 685 -9:00 US Y%sT 1983 Nov 30 686 -9:00 US AK%sT 687Zone America/Sitka 14:58:47 - LMT 1867 Oct 19 15:30 688 -9:01:13 - LMT 1900 Aug 20 12:00 689 -8:00 - PST 1942 690 -8:00 US P%sT 1946 691 -8:00 - PST 1969 692 -8:00 US P%sT 1983 Oct 30 2:00 693 -9:00 US Y%sT 1983 Nov 30 694 -9:00 US AK%sT 695Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 19 15:44:55 696 -8:46:18 - LMT 1900 Aug 20 12:00 697 -8:00 - PST 1942 698 -8:00 US P%sT 1946 699 -8:00 - PST 1969 700 -8:00 US P%sT 1983 Oct 30 2:00 701 -8:00 - PST 2015 Nov 1 2:00 702 -9:00 US AK%sT 2018 Nov 4 2:00 703 -8:00 - PST 2019 Jan 20 2:00 704 -9:00 US AK%sT 705Zone America/Yakutat 14:41:05 - LMT 1867 Oct 19 15:12:18 706 -9:18:55 - LMT 1900 Aug 20 12:00 707 -9:00 - YST 1942 708 -9:00 US Y%sT 1946 709 -9:00 - YST 1969 710 -9:00 US Y%sT 1983 Nov 30 711 -9:00 US AK%sT 712Zone America/Anchorage 14:00:24 - LMT 1867 Oct 19 14:31:37 713 -9:59:36 - LMT 1900 Aug 20 12:00 714 -10:00 - AST 1942 715 -10:00 US A%sT 1967 Apr 716 -10:00 - AHST 1969 717 -10:00 US AH%sT 1983 Oct 30 2:00 718 -9:00 US Y%sT 1983 Nov 30 719 -9:00 US AK%sT 720Zone America/Nome 12:58:22 - LMT 1867 Oct 19 13:29:35 721 -11:01:38 - LMT 1900 Aug 20 12:00 722 -11:00 - NST 1942 723 -11:00 US N%sT 1946 724 -11:00 - NST 1967 Apr 725 -11:00 - BST 1969 726 -11:00 US B%sT 1983 Oct 30 2:00 727 -9:00 US Y%sT 1983 Nov 30 728 -9:00 US AK%sT 729Zone America/Adak 12:13:22 - LMT 1867 Oct 19 12:44:35 730 -11:46:38 - LMT 1900 Aug 20 12:00 731 -11:00 - NST 1942 732 -11:00 US N%sT 1946 733 -11:00 - NST 1967 Apr 734 -11:00 - BST 1969 735 -11:00 US B%sT 1983 Oct 30 2:00 736 -10:00 US AH%sT 1983 Nov 30 737 -10:00 US H%sT 738# The following switches don't make our 1970 cutoff. 739# 740# Kiska observed Tokyo date and time during Japanese occupation from 741# 1942-06-06 to 1943-07-29, and similarly for Attu from 1942-06-07 to 742# 1943-05-29 (all dates American). Both islands are now uninhabited. 743# 744# Shanks writes that part of southwest Alaska (e.g. Aniak) 745# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 746# and another part (e.g. Akiak) made the same switch five weeks later. 747# 748# From David Flater (2004-11-09): 749# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 750# Historic Preservation Commission, provided this information, which 751# suggests that Unalaska deviated from statutory time from early 1967 752# possibly until 1983: 753# 754# Minutes of the Unalaska City Council Meeting, January 10, 1967: 755# "Except for St. Paul and Akutan, Unalaska is the only important 756# location not on Alaska Standard Time. The following resolution was 757# made by William Robinson and seconded by Henry Swanson: Be it 758# resolved that the City of Unalaska hereby goes to Alaska Standard 759# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 760# January 14, Alaska Standard Time.) This resolution was passed with 761# three votes for and one against." 762 763# Hawaii 764 765# From Arthur David Olson (2010-12-09): 766# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225 767# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09, 768# the article is available at 769# https://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf 770# and indicates that standard time was adopted effective noon, January 771# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight 772# saving for the period between the last Sunday of each April and the 773# last Sunday of each September, but less than a month later repealed the 774# act," (page 220), that year-round daylight saving time was in effect 775# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for 776# when clocks changed) and that clocks were changed by 30 minutes 777# effective the second Sunday of June, 1947 (page 219, with no time of 778# day given for when clocks changed). A footnote for the 1933 changes 779# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933) 780# and Act 163 (approved 21 May 1933)." 781 782# From Arthur David Olson (2011-01-19): 783# The following is from "Laws of the Territory of Hawaii Passed by the 784# Seventeenth Legislature: Regular Session 1933," available (as of 785# 2011-01-19) at American University's Pence Law Library. Page 85: "Act 786# 90...At 2 o'clock ante meridian of the last Sunday in April of each 787# year, the standard time of this Territory shall be advanced one 788# hour...This Act shall take effect upon its approval. Approved this 26th 789# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of 790# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is 791# hereby repealed...This Act shall take effect upon its approval, upon 792# which date the standard time of this Territory shall be restored to 793# that existing immediately prior to the taking effect of said Act 90. 794# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor 795# of the Territory of Hawaii." 796# 797# Note that 1933-05-21 was a Sunday. 798# We're left to guess the time of day when Act 163 was approved; guess noon. 799 800# Zone NAME STDOFF RULES FORMAT [UNTIL] 801Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 802 -10:30 - HST 1933 Apr 30 2:00 803 -10:30 1:00 HDT 1933 May 21 12:00 804 -10:30 US H%sT 1947 Jun 8 2:00 805 -10:00 - HST 806 807# Now we turn to US areas that have diverged from the consensus since 1970. 808 809# Arizona mostly uses MST. 810 811# From Paul Eggert (2002-10-20): 812# 813# The information in the rest of this paragraph is derived from the 814# Daylight Saving Time web page 815# <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23) 816# maintained by the Arizona State Library, Archives and Public Records. 817# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 818# time, but by federal law railroads, airlines, bus lines, military 819# personnel, and some engaged in interstate commerce continued to 820# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 821# Gazette says that was the date the law changed, and that 04-01 was 822# the date the state's clocks would change. In 1945 the State of 823# Arizona used standard time all year, again with exceptions only as 824# mandated by federal law. Arizona observed DST in 1967, but Arizona 825# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 826# 827# Shanks says the 1944 experiment came to an end on 1944-03-17. 828# Go with the Arizona State Library instead. 829 830# Zone NAME STDOFF RULES FORMAT [UNTIL] 831Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 19:00u 832 -7:00 US M%sT 1944 Jan 1 0:01 833 -7:00 - MST 1944 Apr 1 0:01 834 -7:00 US M%sT 1944 Oct 1 0:01 835 -7:00 - MST 1967 836 -7:00 US M%sT 1968 Mar 21 837 -7:00 - MST 838 839# From Arthur David Olson (1988-02-13): 840# A writer from the Inter Tribal Council of Arizona, Inc., 841# notes in private correspondence dated 1987-12-28 that "Presently, only the 842# Navajo Nation participates in the Daylight Saving Time policy, due to its 843# large size and location in three states." (The "only" means that other 844# tribal nations don't use DST.) 845# 846# From Paul Eggert (2013-08-26): 847# See America/Denver for a zone appropriate for the Navajo Nation. 848 849# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 850# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 851# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 852# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 853# Teton, Twin Falls, Valley, Washington counties, and the southern 854# quarter of Idaho county) and eastern Oregon (most of Malheur County) 855# switched four weeks late in 1974. 856# 857# Zone NAME STDOFF RULES FORMAT [UNTIL] 858Zone America/Boise -7:44:49 - LMT 1883 Nov 18 20:00u 859 -8:00 US P%sT 1923 May 13 2:00 860 -7:00 US M%sT 1974 861 -7:00 - MST 1974 Feb 3 2:00 862 -7:00 US M%sT 863 864# Indiana 865# 866# For a map of Indiana's time zone regions, see: 867# https://en.wikipedia.org/wiki/Time_in_Indiana 868# 869# From Paul Eggert (2018-11-30): 870# A brief but entertaining history of time in Indiana describes a 1949 debate 871# in the Indiana House where city legislators (who favored "fast time") 872# tussled with farm legislators (who didn't) over a bill to outlaw DST: 873# "Lacking enough votes, the city faction tries to filibuster until time runs 874# out on the session at midnight, but rural champion Rep. Herbert Copeland, 875# R-Madison, leans over the gallery railing and forces the official clock 876# back to 9 p.m., breaking it in the process. The clock sticks on 9 as the 877# debate rages on into the night. The filibuster finally dies out and the 878# bill passes, while outside the chamber, clocks read 3:30 a.m. In the end, 879# it doesn't matter which side won. The law has no enforcement powers and 880# is simply ignored by fast-time communities." 881# How Indiana went from 'God's time' to split zones and daylight-saving. 882# Indianapolis Star. 2018-11-27 14:58 -05. 883# https://www.indystar.com/story/news/politics/2018/11/27/indianapolis-indiana-time-zone-history-central-eastern-daylight-savings-time/2126300002/ 884# 885# From Paul Eggert (2007-08-17): 886# Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 887# with the following exceptions: 888# 889# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 890# Vanderburgh, and Warrick counties have been like America/Chicago. 891# 892# - Dearborn and Ohio counties have been like America/New_York. 893# 894# - Clark, Floyd, and Harrison counties have been like 895# America/Kentucky/Louisville. 896# 897# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke, 898# and Switzerland counties have their own time zone histories as noted below. 899# 900# Shanks partitioned Indiana into 345 regions, each with its own time history, 901# and wrote "Even newspaper reports present contradictory information." 902# Those Hoosiers! Such a flighty and changeable people! 903# Fortunately, most of the complexity occurred before our cutoff date of 1970. 904# 905# Other than Indianapolis, the Indiana place names are so nondescript 906# that they would be ambiguous if we left them at the 'America' level. 907# So we reluctantly put them all in a subdirectory 'America/Indiana'. 908 909# From Paul Eggert (2014-06-26): 910# https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana 911# says "DOT is relocating the time zone boundary in Indiana to move Starke, 912# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the 913# Eastern Time Zone to the Central Time Zone.... The effective date of 914# this rule is 2 a.m. EST Sunday, April 2, 2006, which is the 915# changeover date from standard time to Daylight Saving Time." 916# Strictly speaking, this meant the affected counties changed their 917# clocks twice that night, but this obviously was in error. The intent 918# was that 01:59:59 EST be followed by 02:00:00 CDT. 919 920# From Gwillim Law (2007-02-10): 921# The Associated Press has been reporting that Pulaski County, Indiana is 922# going to switch from Central to Eastern Time on March 11, 2007.... 923# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL 924 925# Rule NAME FROM TO - IN ON AT SAVE LETTER 926Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 927Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 928Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 929# Zone NAME STDOFF RULES FORMAT [UNTIL] 930Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 18:00u 931 -6:00 US C%sT 1920 932 -6:00 Indianapolis C%sT 1942 933 -6:00 US C%sT 1946 934 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 935 -5:00 - EST 1957 Sep 29 2:00 936 -6:00 - CST 1958 Apr 27 2:00 937 -5:00 - EST 1969 938 -5:00 US E%sT 1971 939 -5:00 - EST 2006 940 -5:00 US E%sT 941# 942# Eastern Crawford County, Indiana, left its clocks alone in 1974, 943# as well as from 1976 through 2005. 944# Rule NAME FROM TO - IN ON AT SAVE LETTER 945Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 946Rule Marengo 1951 only - Sep lastSun 2:00 0 S 947Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 948Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 949# Zone NAME STDOFF RULES FORMAT [UNTIL] 950Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 18:00u 951 -6:00 US C%sT 1951 952 -6:00 Marengo C%sT 1961 Apr 30 2:00 953 -5:00 - EST 1969 954 -5:00 US E%sT 1974 Jan 6 2:00 955 -6:00 1:00 CDT 1974 Oct 27 2:00 956 -5:00 US E%sT 1976 957 -5:00 - EST 2006 958 -5:00 US E%sT 959# 960# Daviess, Dubois, Knox, and Martin Counties, Indiana, 961# switched from eastern to central time in April 2006, then switched back 962# in November 2007. 963# Rule NAME FROM TO - IN ON AT SAVE LETTER 964Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D 965Rule Vincennes 1946 only - Sep lastSun 2:00 0 S 966Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D 967Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S 968Rule Vincennes 1955 only - May 1 0:00 1:00 D 969Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D 970Rule Vincennes 1960 only - Oct lastSun 2:00 0 S 971Rule Vincennes 1961 only - Sep lastSun 2:00 0 S 972Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S 973# Zone NAME STDOFF RULES FORMAT [UNTIL] 974Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 18:00u 975 -6:00 US C%sT 1946 976 -6:00 Vincennes C%sT 1964 Apr 26 2:00 977 -5:00 - EST 1969 978 -5:00 US E%sT 1971 979 -5:00 - EST 2006 Apr 2 2:00 980 -6:00 US C%sT 2007 Nov 4 2:00 981 -5:00 US E%sT 982# 983# Perry County, Indiana, switched from eastern to central time in April 2006. 984# From Alois Treindl (2019-07-09): 985# The Indianapolis News, Friday 27 October 1967 states that Perry County 986# returned to CST. It went again to EST on 27 April 1969, as documented by the 987# Indianapolis star of Saturday 26 April. 988# Rule NAME FROM TO - IN ON AT SAVE LETTER 989Rule Perry 1955 only - May 1 0:00 1:00 D 990Rule Perry 1955 1960 - Sep lastSun 2:00 0 S 991Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D 992Rule Perry 1961 1963 - Oct lastSun 2:00 0 S 993# Zone NAME STDOFF RULES FORMAT [UNTIL] 994Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 18:00u 995 -6:00 US C%sT 1946 996 -6:00 Perry C%sT 1964 Apr 26 2:00 997 -5:00 - EST 1967 Oct 29 2:00 998 -6:00 US C%sT 1969 Apr 27 2:00 999 -5:00 US E%sT 1971 1000 -5:00 - EST 2006 Apr 2 2:00 1001 -6:00 US C%sT 1002# 1003# Pike County, Indiana moved from central to eastern time in 1977, 1004# then switched back in 2006, then switched back again in 2007. 1005# Rule NAME FROM TO - IN ON AT SAVE LETTER 1006Rule Pike 1955 only - May 1 0:00 1:00 D 1007Rule Pike 1955 1960 - Sep lastSun 2:00 0 S 1008Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D 1009Rule Pike 1961 1964 - Oct lastSun 2:00 0 S 1010# Zone NAME STDOFF RULES FORMAT [UNTIL] 1011Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 18:00u 1012 -6:00 US C%sT 1955 1013 -6:00 Pike C%sT 1965 Apr 25 2:00 1014 -5:00 - EST 1966 Oct 30 2:00 1015 -6:00 US C%sT 1977 Oct 30 2:00 1016 -5:00 - EST 2006 Apr 2 2:00 1017 -6:00 US C%sT 2007 Nov 4 2:00 1018 -5:00 US E%sT 1019# 1020# Starke County, Indiana moved from central to eastern time in 1991, 1021# then switched back in 2006. 1022# From Arthur David Olson (1991-10-28): 1023# An article on page A3 of the Sunday, 1991-10-27 Washington Post 1024# notes that Starke County switched from Central time to Eastern time as of 1025# 1991-10-27. 1026# Rule NAME FROM TO - IN ON AT SAVE LETTER 1027Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 1028Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 1029Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 1030Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 1031Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 1032# Zone NAME STDOFF RULES FORMAT [UNTIL] 1033Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 18:00u 1034 -6:00 US C%sT 1947 1035 -6:00 Starke C%sT 1962 Apr 29 2:00 1036 -5:00 - EST 1963 Oct 27 2:00 1037 -6:00 US C%sT 1991 Oct 27 2:00 1038 -5:00 - EST 2006 Apr 2 2:00 1039 -6:00 US C%sT 1040# 1041# Pulaski County, Indiana, switched from eastern to central time in 1042# April 2006 and then switched back in March 2007. 1043# Rule NAME FROM TO - IN ON AT SAVE LETTER 1044Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D 1045Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S 1046Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S 1047Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S 1048# Zone NAME STDOFF RULES FORMAT [UNTIL] 1049Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 18:00u 1050 -6:00 US C%sT 1946 1051 -6:00 Pulaski C%sT 1961 Apr 30 2:00 1052 -5:00 - EST 1969 1053 -5:00 US E%sT 1971 1054 -5:00 - EST 2006 Apr 2 2:00 1055 -6:00 US C%sT 2007 Mar 11 2:00 1056 -5:00 US E%sT 1057# 1058# Switzerland County, Indiana, did not observe DST from 1973 through 2005. 1059# Zone NAME STDOFF RULES FORMAT [UNTIL] 1060Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 18:00u 1061 -6:00 US C%sT 1954 Apr 25 2:00 1062 -5:00 - EST 1969 1063 -5:00 US E%sT 1973 1064 -5:00 - EST 2006 1065 -5:00 US E%sT 1066 1067# From Paul Eggert (2018-03-20): 1068# The Louisville & Nashville Railroad's 1883-11-18 change occurred at 1069# 10:00 old local time; train were supposed to come to a standstill 1070# for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not 1071# clear how this matched civil time in Louisville, so for now continue 1072# to assume Louisville switched at noon new local time, like New York. 1073# 1074# From Michael Deckers (2019-08-06): 1075# From the contemporary source given by Alois Treindl, 1076# the switch in Louisville on 1946-04-28 was on 00:01 1077# From Paul Eggert (2019-08-26): 1078# That source was the Louisville Courier-Journal, 1946-04-27, p 4. 1079# Shanks gives 02:00 for all 20th-century transition times in Louisville. 1080# Evidently this is wrong for spring 1946. Although also likely wrong 1081# for other dates, we have no data. 1082# 1083# Part of Kentucky left its clocks alone in 1974. 1084# This also includes Clark, Floyd, and Harrison counties in Indiana. 1085# Rule NAME FROM TO - IN ON AT SAVE LETTER 1086Rule Louisville 1921 only - May 1 2:00 1:00 D 1087Rule Louisville 1921 only - Sep 1 2:00 0 S 1088Rule Louisville 1941 only - Apr lastSun 2:00 1:00 D 1089Rule Louisville 1941 only - Sep lastSun 2:00 0 S 1090Rule Louisville 1946 only - Apr lastSun 0:01 1:00 D 1091Rule Louisville 1946 only - Jun 2 2:00 0 S 1092Rule Louisville 1950 1961 - Apr lastSun 2:00 1:00 D 1093Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 1094Rule Louisville 1956 1961 - Oct lastSun 2:00 0 S 1095# Zone NAME STDOFF RULES FORMAT [UNTIL] 1096Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 18:00u 1097 -6:00 US C%sT 1921 1098 -6:00 Louisville C%sT 1942 1099 -6:00 US C%sT 1946 1100 -6:00 Louisville C%sT 1961 Jul 23 2:00 1101 -5:00 - EST 1968 1102 -5:00 US E%sT 1974 Jan 6 2:00 1103 -6:00 1:00 CDT 1974 Oct 27 2:00 1104 -5:00 US E%sT 1105# 1106# Wayne County, Kentucky 1107# 1108# From Lake Cumberland LIFE 1109# http://www.lake-cumberland.com/life/archive/news990129time.shtml 1110# (1999-01-29) via WKYM-101.7: 1111# Clinton County has joined Wayne County in asking the DoT to change from 1112# the Central to the Eastern time zone.... The Wayne County government made 1113# the same request in December. And while Russell County officials have not 1114# taken action, the majority of respondents to a poll conducted there in 1115# August indicated they would like to change to "fast time" also. 1116# The three Lake Cumberland counties are the farthest east of any U.S. 1117# location in the Central time zone. 1118# 1119# From Rich Wales (2000-08-29): 1120# After prolonged debate, and despite continuing deep differences of opinion, 1121# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 1122# (-0500) time. They won't "fall back" this year. See Sara Shipley, 1123# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 1124# 1125# From Paul Eggert (2001-07-16): 1126# The final rule was published in the 1127# Federal Register 65, 160 (2000-08-17), pp 50154-50158. 1128# https://www.gpo.gov/fdsys/pkg/FR-2000-08-17/html/00-20854.htm 1129# 1130Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 18:00u 1131 -6:00 US C%sT 1946 1132 -6:00 - CST 1968 1133 -6:00 US C%sT 2000 Oct 29 2:00 1134 -5:00 US E%sT 1135 1136 1137# From Rives McDow (2000-08-30): 1138# Here ... are all the changes in the US since 1985. 1139# Kearny County, KS (put all of county on central; 1140# previously split between MST and CST) ... 1990-10 1141# Starke County, IN (from CST to EST) ... 1991-10 1142# Oliver County, ND (from MST to CST) ... 1992-10 1143# West Wendover, NV (from PST TO MST) ... 1999-10 1144# Wayne County, KY (from CST to EST) ... 2000-10 1145# 1146# From Paul Eggert (2001-07-17): 1147# We don't know where the line used to be within Kearny County, KS, 1148# so omit that change for now. 1149# See America/Indiana/Knox for the Starke County, IN change. 1150# See America/North_Dakota/Center for the Oliver County, ND change. 1151# West Wendover, NV officially switched from Pacific to mountain time on 1152# 1999-10-31. See the 1153# Federal Register 64, 203 (1999-10-21), pp 56705-56707. 1154# https://www.gpo.gov/fdsys/pkg/FR-1999-10-21/html/99-27240.htm 1155# However, the Federal Register says that West Wendover already operated 1156# on mountain time, and the rule merely made this official; 1157# hence a separate tz entry is not needed. 1158 1159# Michigan 1160# 1161# From Bob Devine (1988-01-28): 1162# Michigan didn't observe DST from 1968 to 1973. 1163# 1164# From Paul Eggert (1999-03-31): 1165# Shanks writes that Michigan started using standard time on 1885-09-18, 1166# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 1167# that Detroit kept 1168# 1169# local time until 1900 when the City Council decreed that clocks should 1170# be put back twenty-eight minutes to Central Standard Time. Half the 1171# city obeyed, half refused. After considerable debate, the decision 1172# was rescinded and the city reverted to Sun time. A derisive offer to 1173# erect a sundial in front of the city hall was referred to the 1174# Committee on Sewers. Then, in 1905, Central time was adopted 1175# by city vote. 1176# 1177# This story is too entertaining to be false, so go with Howse over Shanks. 1178# 1179# From Paul Eggert (2001-03-06): 1180# Garland (1927) writes "Cleveland and Detroit advanced their clocks 1181# one hour in 1914." This change is not in Shanks. We have no more 1182# info, so omit this for now. 1183# 1184# From Paul Eggert (2019-07-06): 1185# Due to a complicated set of legal maneuvers, in 1967 Michigan did 1186# not start daylight saving time when the rest of the US did. 1187# Instead, it began DST on Jun 14 at 00:01. This was big news: 1188# the Detroit Free Press reported it at the top of Page 1 on 1189# 1967-06-14, in an article "State Adjusting to Switch to Fast Time" 1190# by Gary Blonston, above an article about Thurgood Marshall's 1191# confirmation to the US Supreme Court. Although Shanks says Detroit 1192# observed DST until 1967-10-29 00:01, that time of day seems to be 1193# incorrect, as the Free Press later said DST ended in Michigan at the 1194# same time as the rest of the US. Also, although Shanks reports no DST in 1195# Detroit in 1968, it did observe DST that year; in the November 1968 1196# election Michigan voters narrowly repealed DST, effective 1969. 1197# 1198# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 1199# Rule NAME FROM TO - IN ON AT SAVE LETTER 1200Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 1201Rule Detroit 1948 only - Sep lastSun 2:00 0 S 1202# Zone NAME STDOFF RULES FORMAT [UNTIL] 1203Zone America/Detroit -5:32:11 - LMT 1905 1204 -6:00 - CST 1915 May 15 2:00 1205 -5:00 - EST 1942 1206 -5:00 US E%sT 1946 1207 -5:00 Detroit E%sT 1967 Jun 14 0:01 1208 -5:00 US E%sT 1969 1209 -5:00 - EST 1973 1210 -5:00 US E%sT 1975 1211 -5:00 - EST 1975 Apr 27 2:00 1212 -5:00 US E%sT 1213# 1214# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan, 1215# switched from EST to CST/CDT in 1973. 1216# Rule NAME FROM TO - IN ON AT SAVE LETTER 1217Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 1218Rule Menominee 1946 only - Sep lastSun 2:00 0 S 1219Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 1220Rule Menominee 1966 only - Oct lastSun 2:00 0 S 1221# Zone NAME STDOFF RULES FORMAT [UNTIL] 1222Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 1223 -6:00 US C%sT 1946 1224 -6:00 Menominee C%sT 1969 Apr 27 2:00 1225 -5:00 - EST 1973 Apr 29 2:00 1226 -6:00 US C%sT 1227 1228# Navassa 1229# administered by the US Fish and Wildlife Service 1230# claimed by US under the provisions of the 1856 Guano Islands Act 1231# also claimed by Haiti 1232# occupied 1857/1900 by the Navassa Phosphate Co 1233# US lighthouse 1917/1996-09 1234# currently uninhabited 1235# see Mark Fineman, "An Isle Rich in Guano and Discord", 1236# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 1237# Jimmy Skaggs, _The Great Guano Rush_ (1994). 1238 1239################################################################################ 1240 1241 1242# From Paul Eggert (2017-02-10): 1243# 1244# Unless otherwise specified, the source for data through 1990 is: 1245# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 1246# San Diego: ACS Publications, Inc. (2003). 1247# Unfortunately this book contains many errors and cites no sources. 1248# 1249# Many years ago Gwillim Law wrote that a good source 1250# for time zone data was the International Air Transport 1251# Association's Standard Schedules Information Manual (IATA SSIM), 1252# published semiannually. Law sent in several helpful summaries 1253# of the IATA's data after 1990. Except where otherwise noted, 1254# IATA SSIM is the source for entries after 1990. 1255# 1256# Other sources occasionally used include: 1257# 1258# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94 1259# <https://www.jstor.org/stable/1774359>. 1260# 1261# Pearce C. The Great Daylight Saving Time Controversy. 1262# Australian Ebook Publisher. 2017. ISBN 978-1-925516-96-8. 1263# 1264# Edward W. Whitman, World Time Differences, 1265# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 1266# which I found in the UCLA library. 1267# 1268# William Willett, The Waste of Daylight, 19th edition 1269# <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf> 1270# [PDF] (1914-03) 1271# 1272# For the 1911/1912 establishment of standard time in French possessions, see: 1273# Soci��t�� Fran��aise de Physique, Recueil de constantes physiques (1913), 1274# page 752, 18b. 1275# 1276# See the 'europe' file for Greenland. 1277 1278# Canada 1279 1280# From Alain LaBont�� (1994-11-14): 1281# I post here the time zone abbreviations standardized in Canada 1282# for both English and French in the CAN/CSA-Z234.4-89 standard.... 1283# 1284# UTC Standard time Daylight saving time 1285# offset French English French English 1286# -2:30 - - HAT NDT 1287# -3 - - HAA ADT 1288# -3:30 HNT NST - - 1289# -4 HNA AST HAE EDT 1290# -5 HNE EST HAC CDT 1291# -6 HNC CST HAR MDT 1292# -7 HNR MST HAP PDT 1293# -8 HNP PST HAY YDT 1294# -9 HNY YST - - 1295# 1296# HN: Heure Normale ST: Standard Time 1297# HA: Heure Avanc��e DT: Daylight saving Time 1298# 1299# A: de l'Atlantique Atlantic 1300# C: du Centre Central 1301# E: de l'Est Eastern 1302# M: Mountain 1303# N: Newfoundland 1304# P: du Pacifique Pacific 1305# R: des Rocheuses 1306# T: de Terre-Neuve 1307# Y: du Yukon Yukon 1308# 1309# From Paul Eggert (1994-11-22): 1310# Alas, this sort of thing must be handled by localization software. 1311 1312# Unless otherwise specified, the data entries for Canada are all from Shanks 1313# & Pottenger. 1314 1315# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31, 1316# 2007-03-01): 1317# The British Columbia government announced yesterday that it will 1318# adjust daylight savings next year to align with changes in the 1319# U.S. and the rest of Canada.... 1320# https://archive.news.gov.bc.ca/releases/news_releases_2005-2009/2006AG0014-000330.htm 1321# ... 1322# Nova Scotia 1323# Daylight saving time will be extended by four weeks starting in 2007.... 1324# https://www.novascotia.ca/just/regulations/rg2/2006/ma1206.pdf 1325# 1326# [For New Brunswick] the new legislation dictates that the time change is to 1327# be done at 02:00 instead of 00:01. 1328# https://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf 1329# ... 1330# Manitoba has traditionally changed the clock every fall at 03:00. 1331# As of 2006, the transition is to take place one hour earlier at 02:00. 1332# https://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php 1333# ... 1334# [Alberta, Ontario, Quebec] will follow US rules. 1335# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM 1336# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm 1337# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF 1338# ... 1339# P.E.I. will follow US rules.... 1340# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf 1341# ... 1342# Province of Newfoundland and Labrador.... 1343# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm 1344# ... 1345# Yukon 1346# https://www.gov.yk.ca/legislation/regs/oic2006_127.pdf 1347# ... 1348# N.W.T. will follow US rules. Whoever maintains the government web site 1349# does not seem to believe in bookmarks. To see the news release, click the 1350# following link and search for "Daylight Savings Time Change". Press the 1351# "Daylight Savings Time Change" link; it will fire off a popup using 1352# JavaScript. 1353# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive 1354# ... 1355# Nunavut 1356# An amendment to the Interpretation Act was registered on February 19/2007.... 1357# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf 1358 1359# From Paul Eggert (2014-10-18): 1360# H. David Matthews and Mary Vincent's map 1361# "It's about TIME", _Canadian Geographic_ (September-October 1998) 1362# https://web.archive.org/web/19990827055050/https://canadiangeographic.ca/SO98/geomap.htm 1363# contains detailed boundaries for regions observing nonstandard 1364# time and daylight saving time arrangements in Canada circa 1998. 1365# 1366# National Research Council Canada maintains info about time zones and DST. 1367# https://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html 1368# https://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5 1369# Its unofficial information is often taken from Matthews and Vincent. 1370 1371# From Paul Eggert (2006-06-27): 1372# For now, assume all of DST-observing Canada will fall into line with the 1373# new US DST rules, 1374 1375# From Chris Walton (2011-12-01) 1376# In the first of Tammy Hardwick's articles 1377# http://www.ilovecreston.com/?p=articles&t=spec&ar=260 1378# she quotes the Friday November 1/1918 edition of the Creston Review. 1379# The quote includes these two statements: 1380# 'Sunday the CPR went back to the old system of time...' 1381# '... The daylight saving scheme was dropped all over Canada at the same time,' 1382# These statements refer to a transition from daylight time to standard time 1383# that occurred nationally on Sunday October 27/1918. This transition was 1384# also documented in the Saturday October 26/1918 edition of the Toronto Star. 1385 1386# In light of that evidence, we alter the date from the earlier believed 1387# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day 1388# than Thursday) in all Canadian rulesets. 1389 1390# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1391Rule Canada 1918 only - Apr 14 2:00 1:00 D 1392Rule Canada 1918 only - Oct 27 2:00 0 S 1393Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 1394Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 1395Rule Canada 1945 only - Sep 30 2:00 0 S 1396Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 1397Rule Canada 1974 2006 - Oct lastSun 2:00 0 S 1398Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D 1399Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D 1400Rule Canada 2007 max - Nov Sun>=1 2:00 0 S 1401 1402 1403# Newfoundland and Labrador 1404 1405# From Paul Eggert (2017-10-14): 1406# Legally Labrador should observe Newfoundland time; see: 1407# McLeod J. Labrador time - legal or not? St. John's Telegram, 2017-10-07 1408# http://www.thetelegram.com/news/local/labrador-time--legal-or-not-154860/ 1409# Matthews and Vincent (1998) write that the only part of Labrador 1410# that follows the rules is the southeast corner, including Port Hope 1411# Simpson and Mary's Harbour, but excluding, say, Black Tickle. 1412 1413# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1414Rule StJohns 1917 only - Apr 8 2:00 1:00 D 1415Rule StJohns 1917 only - Sep 17 2:00 0 S 1416# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger. 1417Rule StJohns 1919 only - May 5 23:00 1:00 D 1418Rule StJohns 1919 only - Aug 12 23:00 0 S 1419# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger. 1420Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 1421Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 1422# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks & 1423# Pottenger. 1424Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 1425Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 1426# Whitman gives the following transitions: 1427# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 1428# but go with Shanks & Pottenger and assume they used Canadian rules. 1429# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 1430# Apr 30 - Sep 24; go with Shanks & Pottenger. 1431Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 1432Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 1433Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 1434Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 1435Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 1436# From Paul Eggert (2000-10-02): 1437# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 1438# at 00:01 local time. For now, assume it started in 1987. 1439 1440# From Michael Pelley (2011-09-12): 1441# We received today, Monday, September 12, 2011, notification that the 1442# changes to the Newfoundland Standard Time Act have been proclaimed. 1443# The change in the Act stipulates that the change from Daylight Savings 1444# Time to Standard Time and from Standard Time to Daylight Savings Time 1445# now occurs at 2:00AM. 1446# ... 1447# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm 1448# ... 1449# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery 1450# Office of the Chief Information Officer 1451# Executive Council 1452# Government of Newfoundland & Labrador 1453 1454Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 1455Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S 1456Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 1457Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D 1458Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D 1459Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S 1460# 1461# St John's has an apostrophe, but POSIX file names can't have apostrophes. 1462# Zone NAME STDOFF RULES FORMAT [UNTIL] 1463Zone America/St_Johns -3:30:52 - LMT 1884 1464 -3:30:52 StJohns N%sT 1918 1465 -3:30:52 Canada N%sT 1919 1466 -3:30:52 StJohns N%sT 1935 Mar 30 1467 -3:30 StJohns N%sT 1942 May 11 1468 -3:30 Canada N%sT 1946 1469 -3:30 StJohns N%sT 2011 Nov 1470 -3:30 Canada N%sT 1471 1472# most of east Labrador 1473 1474# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'. 1475# Zone NAME STDOFF RULES FORMAT [UNTIL] 1476Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 1477 -3:30:52 - NST 1918 1478 -3:30:52 Canada N%sT 1919 1479 -3:30:52 - NST 1935 Mar 30 1480 -3:30 - NST 1936 1481 -3:30 StJohns N%sT 1942 May 11 1482 -3:30 Canada N%sT 1946 1483 -3:30 StJohns N%sT 1966 Mar 15 2:00 1484 -4:00 StJohns A%sT 2011 Nov 1485 -4:00 Canada A%sT 1486 1487 1488# west Labrador, Nova Scotia, Prince Edward I, 1489# ��les-de-la-Madeleine, Listuguj reserve 1490 1491# From Brian Inglis (2015-07-20): 1492# From the historical weather station records available at: 1493# https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada 1494# Sydney shares the same time history as Glace Bay, so was 1495# likely to be the same across the island.... 1496# Sydney, as the capital and most populous location, or Cape Breton, would 1497# have been better names for the zone had we known this in 1996. 1498 1499# From Paul Eggert (2015-07-20): 1500# Shanks & Pottenger write that since 1970 most of this region has been like 1501# Halifax. Many locales did not observe peacetime DST until 1972; 1502# the Cape Breton area, represented by Glace Bay, is the largest we know of 1503# (Glace Bay was perhaps not the best name choice but no point changing now). 1504# Shanks & Pottenger also write that Liverpool, NS was the only town 1505# in Canada to observe DST in 1971 but not 1970; for now we'll assume 1506# this is a typo. 1507 1508# From Jeffery Nichols (2020-01-09): 1509# America/Halifax ... also applies to ��les-de-la-Madeleine and the Listuguj 1510# reserve in Quebec. Officially, this came into effect on January 1, 2007 1511# (Legal Time Act, CQLR c T-5.1), but the legislative debates surrounding that 1512# bill say that it is "accommodating the customs and practices" of those 1513# regions, which suggests that they have always been in-line with Halifax. 1514 1515# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1516Rule Halifax 1916 only - Apr 1 0:00 1:00 D 1517Rule Halifax 1916 only - Oct 1 0:00 0 S 1518Rule Halifax 1920 only - May 9 0:00 1:00 D 1519Rule Halifax 1920 only - Aug 29 0:00 0 S 1520Rule Halifax 1921 only - May 6 0:00 1:00 D 1521Rule Halifax 1921 1922 - Sep 5 0:00 0 S 1522Rule Halifax 1922 only - Apr 30 0:00 1:00 D 1523Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 1524Rule Halifax 1923 only - Sep 4 0:00 0 S 1525Rule Halifax 1924 only - Sep 15 0:00 0 S 1526Rule Halifax 1925 only - Sep 28 0:00 0 S 1527Rule Halifax 1926 only - May 16 0:00 1:00 D 1528Rule Halifax 1926 only - Sep 13 0:00 0 S 1529Rule Halifax 1927 only - May 1 0:00 1:00 D 1530Rule Halifax 1927 only - Sep 26 0:00 0 S 1531Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 1532Rule Halifax 1928 only - Sep 9 0:00 0 S 1533Rule Halifax 1929 only - Sep 3 0:00 0 S 1534Rule Halifax 1930 only - Sep 15 0:00 0 S 1535Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 1536Rule Halifax 1932 only - May 1 0:00 1:00 D 1537Rule Halifax 1933 only - Apr 30 0:00 1:00 D 1538Rule Halifax 1933 only - Oct 2 0:00 0 S 1539Rule Halifax 1934 only - May 20 0:00 1:00 D 1540Rule Halifax 1934 only - Sep 16 0:00 0 S 1541Rule Halifax 1935 only - Jun 2 0:00 1:00 D 1542Rule Halifax 1935 only - Sep 30 0:00 0 S 1543Rule Halifax 1936 only - Jun 1 0:00 1:00 D 1544Rule Halifax 1936 only - Sep 14 0:00 0 S 1545Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 1546Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 1547Rule Halifax 1939 only - May 28 0:00 1:00 D 1548Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 1549Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 1550Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 1551Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 1552Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 1553Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 1554Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 1555Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 1556Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 1557# Zone NAME STDOFF RULES FORMAT [UNTIL] 1558Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 1559 -4:00 Halifax A%sT 1918 1560 -4:00 Canada A%sT 1919 1561 -4:00 Halifax A%sT 1942 Feb 9 2:00s 1562 -4:00 Canada A%sT 1946 1563 -4:00 Halifax A%sT 1974 1564 -4:00 Canada A%sT 1565Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 1566 -4:00 Canada A%sT 1953 1567 -4:00 Halifax A%sT 1954 1568 -4:00 - AST 1972 1569 -4:00 Halifax A%sT 1974 1570 -4:00 Canada A%sT 1571 1572# New Brunswick 1573 1574# From Paul Eggert (2007-01-31): 1575# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf> 1576# says they changed at 00:01 through 2006, and 1577# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it 1578# clear that this was the case since at least 1993. 1579# For now, assume it started in 1993. 1580 1581# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1582Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D 1583Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S 1584Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D 1585Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S 1586Rule Moncton 1939 only - May 27 1:00 1:00 D 1587Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S 1588Rule Moncton 1940 only - May 19 1:00 1:00 D 1589Rule Moncton 1941 only - May 4 1:00 1:00 D 1590Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D 1591Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S 1592Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S 1593Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D 1594Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S 1595# Zone NAME STDOFF RULES FORMAT [UNTIL] 1596Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 1597 -5:00 - EST 1902 Jun 15 1598 -4:00 Canada A%sT 1933 1599 -4:00 Moncton A%sT 1942 1600 -4:00 Canada A%sT 1946 1601 -4:00 Moncton A%sT 1973 1602 -4:00 Canada A%sT 1993 1603 -4:00 Moncton A%sT 2007 1604 -4:00 Canada A%sT 1605 1606# Quebec 1607 1608# From Paul Eggert (2020-01-10): 1609# See America/Toronto for most of Quebec, including Montreal. 1610# See America/Halifax for the ��les de la Madeleine and the Listuguj reserve. 1611# See America/Puerto_Rico for east of Natashquan. 1612# Zone NAME STDOFF RULES FORMAT [UNTIL] 1613Zone America/Blanc-Sablon -3:48:28 - LMT 1884 1614 -4:00 Canada A%sT 1970 1615 -4:00 - AST 1616 1617# Ontario 1618 1619# From Mark Brader (2003-07-26): 1620# [According to the Toronto Star] Orillia, Ontario, adopted DST 1621# effective Saturday, 1912-06-22, 22:00; the article mentions that 1622# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 1623# have already done so. In Orillia DST was to run until Saturday, 1624# 1912-08-31 (no time mentioned), but it was met with considerable 1625# hostility from certain segments of the public, and was revoked after 1626# only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but 1627# presumably that should be -07-06. (1912-06-19, -07-12; also letters 1628# earlier in June). 1629# 1630# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 1631# 1632# From Paul Eggert (2017-07-08): 1633# For more on Orillia, see: Daubs K. Bold attempt at daylight saving 1634# time became a comic failure in Orillia. Toronto Star 2017-07-08. 1635# https://www.thestar.com/news/insight/2017/07/08/bold-attempt-at-daylight-saving-time-became-a-comic-failure-in-orillia.html 1636 1637# From Mark Brader (2010-03-06): 1638# 1639# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom 1640# right corner of page 1, it says that Toronto will return to standard 1641# time at 2 am Sunday morning (which agrees with the database), and that: 1642# 1643# The one-hour setback will go into effect throughout most of Ontario, 1644# except in areas like Windsor which remains on standard time all year. 1645# 1646# ... I don't know if Windsor began observing DST when Detroit did, 1647# or in 1974, or on some other date. 1648# 1649# By the way, the article continues by noting that: 1650# 1651# Some cities in the United States have pushed the deadline back 1652# three weeks and will change over from daylight saving in October. 1653 1654# From Chris Walton (2024-01-09): 1655# The [Toronto] changes in 1947, 1948, and 1949 took place at 2:00 a.m. local 1656# time instead of midnight.... Toronto Daily Star - ... 1657# April 2, 1947 - Page 39 ... April 7, 1948 - Page 13 ... 1658# April 2, 1949 - Page 1 ... April 7, 1949 - Page 24 ... 1659# November 25, 1949 - Page 52 ... April 21, 1950 - Page 14 ... 1660# September 19, 1950 - Page 46 ... September 20, 1950 - Page 3 ... 1661# November 24, 1950 - Page 21 1662 1663# From Arthur David Olson (2010-07-17): 1664# 1665# "Standard Time and Time Zones in Canada" appeared in 1666# The Journal of The Royal Astronomical Society of Canada, 1667# volume 26, number 2 (February 1932) and, as of 2010-07-17, 1668# was available at 1669# http://adsabs.harvard.edu/full/1932JRASC..26...49S 1670# 1671# It includes the text below (starting on page 57): 1672# 1673# A list of the places in Canada using daylight saving time would 1674# require yearly revision. From information kindly furnished by 1675# the provincial governments and by the postmasters in many cities 1676# and towns, it is found that the following places used daylight sav- 1677# ing in 1930. The information for the province of Quebec is definite, 1678# for the other provinces only approximate: 1679# 1680# Province Daylight saving time used 1681# Prince Edward Island Not used. 1682# Nova Scotia In Halifax only. 1683# New Brunswick In St. John only. 1684# Quebec In the following places: 1685# Montreal Lachine 1686# Quebec Mont-Royal 1687# L��vis Iberville 1688# St. Lambert Cap de la Madel��ine 1689# Verdun Loretteville 1690# Westmount Richmond 1691# Outremont St. J��r��me 1692# Longueuil Greenfield Park 1693# Arvida Waterloo 1694# Chambly-Canton Beaulieu 1695# Melbourne La Tuque 1696# St. Th��ophile Buckingham 1697# Ontario Used generally in the cities and towns along 1698# the southerly part of the province. Not 1699# used in the northwesterly part. 1700# Manitoba Not used. 1701# Saskatchewan In Regina only. 1702# Alberta Not used. 1703# British Columbia Not used. 1704# 1705# With some exceptions, the use of daylight saving may be said to be limited 1706# to those cities and towns lying between Quebec city and Windsor, Ont. 1707 1708# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1709Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1710Rule Toronto 1919 only - Oct 26 0:00 0 S 1711Rule Toronto 1920 only - May 2 2:00 1:00 D 1712Rule Toronto 1920 only - Sep 26 0:00 0 S 1713Rule Toronto 1921 only - May 15 2:00 1:00 D 1714Rule Toronto 1921 only - Sep 15 2:00 0 S 1715Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1716# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16" 1717# was meant. 1718Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1719Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1720Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1721Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1722Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1723Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1724Rule Toronto 1945 1948 - Sep lastSun 2:00 0 S 1725Rule Toronto 1946 1973 - Apr lastSun 2:00 1:00 D 1726Rule Toronto 1949 1950 - Nov lastSun 2:00 0 S 1727Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1728# Shanks & Pottenger say Toronto ended DST a week early in 1971, 1729# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this 1730# is wrong, and that he had confirmed it by checking the 1971-10-30 1731# Toronto Star, which said that DST was ending 1971-10-31 as usual. 1732Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1733 1734 1735# Zone NAME STDOFF RULES FORMAT [UNTIL] 1736Zone America/Toronto -5:17:32 - LMT 1895 1737 -5:00 Canada E%sT 1919 1738 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1739 -5:00 Canada E%sT 1946 1740 -5:00 Toronto E%sT 1974 1741 -5:00 Canada E%sT 1742# Zone NAME STDOFF RULES FORMAT [UNTIL] 1743Zone America/Atikokan -6:06:28 - LMT 1895 1744 -6:00 Canada C%sT 1940 Sep 29 1745 -6:00 1:00 CDT 1942 Feb 9 2:00s 1746 -6:00 Canada C%sT 1945 Sep 30 2:00 1747 -5:00 - EST 1748#PACKRATLIST zone.tab Link America/Atikokan America/Coral_Harbour 1749 1750 1751# Manitoba 1752 1753# From Rob Douglas (2006-04-06): 1754# the old Manitoba Time Act - as amended by Bill 2, assented to 1755# March 27, 1987 ... said ... 1756# "between two o'clock Central Standard Time in the morning of 1757# the first Sunday of April of each year and two o'clock Central 1758# Standard Time in the morning of the last Sunday of October next 1759# following, one hour in advance of Central Standard Time."... 1760# I believe that the English legislation [of the old time act] had 1761# been assented to (March 22, 1967).... 1762# Also, as far as I can tell, there was no order-in-council varying 1763# the time of Daylight Saving Time for 2005 and so the provisions of 1764# the 1987 version would apply - the changeover was at 2:00 Central 1765# Standard Time (i.e. not until 3:00 Central Daylight Time). 1766 1767# From Paul Eggert (2006-04-10): 1768# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s) 1769# starting 1966. Since 02:00s is clearly correct for 1967 on, assume 1770# it was also 02:00s in 1966. 1771 1772# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1773Rule Winn 1916 only - Apr 23 0:00 1:00 D 1774Rule Winn 1916 only - Sep 17 0:00 0 S 1775Rule Winn 1918 only - Apr 14 2:00 1:00 D 1776Rule Winn 1918 only - Oct 27 2:00 0 S 1777Rule Winn 1937 only - May 16 2:00 1:00 D 1778Rule Winn 1937 only - Sep 26 2:00 0 S 1779Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1780Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1781Rule Winn 1945 only - Sep lastSun 2:00 0 S 1782Rule Winn 1946 only - May 12 2:00 1:00 D 1783Rule Winn 1946 only - Oct 13 2:00 0 S 1784Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1785Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1786Rule Winn 1950 only - May 1 2:00 1:00 D 1787Rule Winn 1950 only - Sep 30 2:00 0 S 1788Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1789Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1790Rule Winn 1959 only - Oct lastSun 2:00 0 S 1791Rule Winn 1960 only - Sep lastSun 2:00 0 S 1792Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1793Rule Winn 1963 only - Sep 22 2:00 0 S 1794Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D 1795Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S 1796Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D 1797# Zone NAME STDOFF RULES FORMAT [UNTIL] 1798Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1799 -6:00 Winn C%sT 2006 1800 -6:00 Canada C%sT 1801 1802 1803# Saskatchewan 1804 1805# From Mark Brader (2003-07-26): 1806# The first actual adoption of DST in Canada was at the municipal 1807# level. As the [Toronto] Star put it (1912-06-07), "While people 1808# elsewhere have long been talking of legislation to save daylight, 1809# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1810# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1811# presumably late evening, as below), and would run until "the end of 1812# the summer". The discrepancy between municipal time and railroad 1813# time was noted. 1814 1815# From Paul Eggert (2003-07-27): 1816# Willett (1914-03) notes that DST "has been in operation ... in the 1817# City of Moose Jaw, Saskatchewan, for one year." 1818 1819# From Paul Eggert (2019-07-25): 1820# Pearce's book says Regina observed DST in 1914-1917. No dates and times, 1821# unfortunately. It also says that in 1914 Saskatoon observed DST 1822# from 1 June to 6 July, and that DST was also tried out in Davidson, 1823# Melfort, and Prince Albert. 1824 1825# From Paul Eggert (2006-03-22): 1826# Shanks & Pottenger say that since 1970 this region has mostly been as Regina. 1827# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1828# Other western towns (e.g. Lloydminster) are like Edmonton. 1829# Matthews and Vincent (1998) write that Denare Beach and Creighton 1830# are like Winnipeg, in violation of Saskatchewan law. 1831 1832# From W. Jones (1992-11-06): 1833# The. . .below is based on information I got from our law library, the 1834# provincial archives, and the provincial Community Services department. 1835# A precise history would require digging through newspaper archives, and 1836# since you didn't say what you wanted, I didn't bother. 1837# 1838# Saskatchewan is split by a time zone meridian (105W) and over the years 1839# the boundary became pretty ragged as communities near it reevaluated 1840# their affiliations in one direction or the other. In 1965 a provincial 1841# referendum favoured legislating common time practices. 1842# 1843# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1844# Saskatchewan 1978) was proclaimed, and established that the eastern 1845# part of Saskatchewan would use CST year round, that districts in 1846# northwest Saskatchewan would by default follow CST but could opt to 1847# follow Mountain Time rules (thus 1 hour difference in the winter and 1848# zero in the summer), and that districts in southwest Saskatchewan would 1849# by default follow MT but could opt to follow CST. 1850# 1851# It took a few years for the dust to settle (I know one story of a town 1852# on one time zone having its school in another, such that a mom had to 1853# serve her family lunch in two shifts), but presently it seems that only 1854# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1855# rules any more; all other districts appear to have used CST year round 1856# since sometime in the 1960s. 1857 1858# From Chris Walton (2006-06-26): 1859# The Saskatchewan time act which was last updated in 1996 is about 30 pages 1860# long and rather painful to read. 1861# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf 1862 1863# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1864Rule Regina 1918 only - Apr 14 2:00 1:00 D 1865Rule Regina 1918 only - Oct 27 2:00 0 S 1866Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1867Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1868Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1869Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1870Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1871Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1872Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1873Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1874Rule Regina 1945 only - Sep lastSun 2:00 0 S 1875Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1876Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1877Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1878Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1879Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1880Rule Regina 1959 only - Oct lastSun 2:00 0 S 1881# 1882Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1883Rule Swift 1957 only - Oct lastSun 2:00 0 S 1884Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1885Rule Swift 1959 only - Oct lastSun 2:00 0 S 1886Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1887# Zone NAME STDOFF RULES FORMAT [UNTIL] 1888Zone America/Regina -6:58:36 - LMT 1905 Sep 1889 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1890 -6:00 - CST 1891Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1892 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1893 -7:00 Regina M%sT 1950 1894 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1895 -6:00 - CST 1896 1897 1898# Alberta 1899 1900# From Alois Treindl (2019-07-19): 1901# There was no DST in Alberta in 1967... Calgary Herald, 29 April 1967. 1902# 1969, no DST, from Edmonton Journal 18 April 1969 1903# 1904# From Paul Eggert (2019-07-25): 1905# Pearce's book says that Alberta's 1948 Daylight Saving Act required 1906# Mountain Standard Time without DST, and that "anyone who broke that law 1907# could be fined up to $25 and costs". There seems to be no record of 1908# anybody paying the fine. The law was not changed until an August 1971 1909# plebiscite reinstituted DST in 1972. This story is also mentioned in: 1910# Boyer JP. Forcing Choice: The Risky Reward of Referendums. Dundum. 2017. 1911# ISBN 978-1459739123. 1912 1913# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1914Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1915Rule Edm 1918 only - Oct 27 2:00 0 S 1916Rule Edm 1919 only - May 27 2:00 0 S 1917Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1918Rule Edm 1920 only - Oct lastSun 2:00 0 S 1919Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1920Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1921Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1922Rule Edm 1945 only - Sep lastSun 2:00 0 S 1923Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1924Rule Edm 1947 only - Sep lastSun 2:00 0 S 1925Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1926Rule Edm 1972 2006 - Oct lastSun 2:00 0 S 1927# Zone NAME STDOFF RULES FORMAT [UNTIL] 1928Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1929 -7:00 Edm M%sT 1987 1930 -7:00 Canada M%sT 1931 1932 1933# British Columbia 1934 1935# From Paul Eggert (2006-03-22): 1936# Shanks & Pottenger write that since 1970 most of this region has 1937# been like Vancouver. 1938# Dawson Creek uses MST. Much of east BC is like Edmonton. 1939 1940# From Matt Johnson (2015-09-21): 1941# Fort Nelson, BC, Canada will cancel DST this year. So while previously they 1942# were aligned with America/Vancouver, they're now aligned with 1943# America/Dawson_Creek. 1944# http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html 1945# 1946# From Tim Parenti (2015-09-23): 1947# This requires a new zone for the Northern Rockies Regional Municipality, 1948# America/Fort_Nelson. The resolution of 2014-12-08 was reached following a 1949# 2014-11-15 poll with nearly 75% support. Effectively, the municipality has 1950# been on MST (-0700) like Dawson Creek since it advanced its clocks on 1951# 2015-03-08. 1952# 1953# From Paul Eggert (2019-07-25): 1954# Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver. 1955# Alois Treindl confirmed this on 07-22, citing the 1946-04-27 Vancouver Daily 1956# Province. He also cited the 1946-09-28 Victoria Daily Times, which said 1957# that Vancouver, Victoria, etc. "change at midnight Saturday"; for now, 1958# guess they meant 02:00 Sunday since 02:00 was common practice in Vancouver. 1959# 1960# Early Vancouver, Volume Four, by Major J.S. Matthews, V.D., 2011 edition 1961# says that a 1922 plebiscite adopted DST, but a 1923 plebiscite rejected it. 1962# http://former.vancouver.ca/ctyclerk/archives/digitized/EarlyVan/SearchEarlyVan/Vol4pdf/MatthewsEarlyVancouverVol4_DaylightSavings.pdf 1963# A catalog entry for a newspaper clipping seems to indicate that Vancouver 1964# observed DST in 1941 from 07-07 through 09-27; see 1965# https://searcharchives.vancouver.ca/daylight-saving-1918-starts-again-july-7-1941-start-d-s-sept-27-end-of-d-s-1941 1966# We have no further details, so omit them for now. 1967 1968# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1969Rule Vanc 1918 only - Apr 14 2:00 1:00 D 1970Rule Vanc 1918 only - Oct 27 2:00 0 S 1971Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 1972Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 1973Rule Vanc 1945 only - Sep 30 2:00 0 S 1974Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 1975Rule Vanc 1946 only - Sep 29 2:00 0 S 1976Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 1977Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S 1978# Zone NAME STDOFF RULES FORMAT [UNTIL] 1979Zone America/Vancouver -8:12:28 - LMT 1884 1980 -8:00 Vanc P%sT 1987 1981 -8:00 Canada P%sT 1982Zone America/Dawson_Creek -8:00:56 - LMT 1884 1983 -8:00 Canada P%sT 1947 1984 -8:00 Vanc P%sT 1972 Aug 30 2:00 1985 -7:00 - MST 1986Zone America/Fort_Nelson -8:10:47 - LMT 1884 1987 -8:00 Vanc P%sT 1946 1988 -8:00 - PST 1947 1989 -8:00 Vanc P%sT 1987 1990 -8:00 Canada P%sT 2015 Mar 8 2:00 1991 -7:00 - MST 1992# Zone NAME STDOFF RULES FORMAT [UNTIL] 1993Zone America/Creston -7:46:04 - LMT 1884 1994 -7:00 - MST 1916 Oct 1 1995 -8:00 - PST 1918 Jun 2 1996 -7:00 - MST 1997 1998# Northwest Territories, Nunavut, Yukon 1999 2000# From Chris Walton (2022-11-06): 2001# Whitehorse Star - Thursday April 22, 1965 - page 1 2002# title: DST Starts Monday ... 2003# https://www.newspapers.com/image/578587481/ 2004# The title of this first article is wrong and/or misleading. 2005# Also, the start time shown in the article is vague; it simply says "after 2006# midnight" when it probably should have stated 2:00a.m.... 2007# 2008# Whitehorse Star - Monday October 25, 1965 - page 15 ... 2009# https://www.newspapers.com/image/578589147/ 2010# The 1965 Yukon Council minutes can be found here: 2011# http://assets.yukonarchives.ca/PER_YG_06_1965_C20_S02_v1.pdf 2012# ... I do not currently believe that NWT touched any of its clocks in 1965.... 2013# 2014# Whitehorse Star - Thursday Feb 24,1966 - page 2 2015# title: It's Time for YDT ... 2016# https://www.newspapers.com/image/578575979/ ... 2017# America/Whitehorse as a permanent change from UTC-9(YST) to 2018# UTC-8(PST) at 00:00 on Sunday February 27, 1966.... 2019# 2020# Whitehorse Star - Friday April 28,1972 - page 6 2021# title: Daylight Saving Time for N.W.T.... 2022# https://www.newspapers.com/image/578701610/ ... 2023# Nunavut and NWT zones ... DST starting in 1972.... Start and End ... 2024# should be the same as the rest of Canada 2025# 2026# 2027# From Paul Eggert (2022-11-06): 2028# For now, assume Yukon's 1965-04-22 spring forward was 00:00 -> 02:00, as this 2029# seems likely than 02:00 -> 04:00 and matches "after midnight". 2030 2031# From Paul Eggert (2006-03-22): 2032# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 2033# Mathew Englander (1996-10-07) gives the following refs: 2034# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 2035# c. 7 defines Yukon standard time as UTC-9.... 2036# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 2037# [https://www.canlii.org/en/ca/laws/stat/rsc-1985-c-i-21/latest/rsc-1985-c-i-21.html] 2038# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 2039# * O.I.C. 1980/02 established DST. 2040# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 2041 2042# From Brian Inglis (2015-04-14): 2043# 2044# I tried to trace the history of Yukon time and found the following 2045# regulations, giving the reference title and URL if found, regulation name, 2046# and relevant quote if available. Each regulation specifically revokes its 2047# predecessor. The final reference is to the current Interpretation Act 2048# authorizing and resulting from these regulatory changes. 2049# 2050# Only recent regulations were retrievable via Yukon government site search or 2051# index, and only some via Canadian legal sources. Other sources used include 2052# articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS 2053# Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and 2054# 1970 quoted below; each article includes current extracts from provincial 2055# and territorial ST and DST regulations at the end, summaries and details of 2056# standard times and daylight saving time at many locations across Canada, 2057# with time zone maps, tables and calculations for Canadian Sunrise, Sunset, 2058# and LMST; they also cover many countries and global locations, with a chart 2059# and table showing current Universal Time offsets, and may be useful as 2060# another source of information for 1970 and earlier. 2061# 2062# * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26, 2063# pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS) 2064# http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75: 2065# Yukon Interpretation Ordinance 2066# Yukon standard time is the local mean time at the one hundred and 2067# thirty-fifth meridian. 2068# 2069# * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.; 2070# JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System 2071# (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1: 2072# Yukon Interpretation Ordinance, 1955, Chap. 16. 2073# 2074# (1) Subject to this section, standard time shall be reckoned as nine 2075# hours behind Greenwich Time and called Yukon Standard Time. 2076# 2077# (2) Notwithstanding subsection (1), the Commissioner may make regulations 2078# varying the manner of reckoning standard time. 2079# 2080# * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance 2081# [no online source found] 2082# 2083# * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC, 2084# Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS) 2085# http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon 2086# Territory Commissioner's Order 1967-59 Interpretation Ordinance ... 2087# 2088# 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon 2089# Territory on 27th January, 1966, is hereby revoked. 2090# 2091# 2. Yukon (East) Standard Time as defined by section 36 of the 2092# Interpretation Ordinance from and after mid-night on the 28th day of May, 2093# 1967 shall be reckoned in the same manner as Pacific Standard Time, that 2094# is to say, eight hours behind Greenwich Time in the area of the Yukon 2095# Territory lying east of the 138th degree longitude west. 2096# 2097# 3. In the remainder of the Territory, lying west of the 138th degree 2098# longitude west, Yukon (West) Standard Time shall be reckoned as nine 2099# hours behind Greenwich Time. 2100# 2101# * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214 2102# https://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html 2103# C.O. 1973/214 INTERPRETATION ACT ... 2104# 2105# 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby 2106# revoked. 2107# 2108# 2. Yukon Standard Time as defined by section 36 of the Interpretation 2109# Act from and after midnight on the twenty-eighth day of October, 1973 2110# shall be reckoned in the same manner as Pacific Standard Time, that is 2111# to say eight hours behind Greenwich Time. 2112# 2113# * O.I.C. 1980/02 INTERPRETATION ACT 2114# https://mm.icann.org/pipermail/tz/attachments/20201125/d5adc93b/CAYTOIC1980-02DST1980-01-04-0001.pdf 2115# 2116# * Yukon Daylight Saving Time, YOIC 1987/56 2117# https://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html 2118# O.I.C. 1987/056 INTERPRETATION ACT ... 2119# 2120# In every year between 2121# (a) two o'clock in the morning in the first Sunday in April, and 2122# (b) two o'clock in the morning in the last Sunday in October, 2123# Standard Time shall be reckoned as seven hours behind Greenwich Time and 2124# called Yukon Daylight Saving Time. 2125# ... 2126# Dated ... 9th day of March, A.D., 1987. 2127# 2128# * Yukon Daylight Saving Time 2006, YOIC 2006/127 2129# https://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html 2130# O.I.C. 2006/127 INTERPRETATION ACT ... 2131# 2132# 1. In Yukon each year the time for general purposes shall be 7 hours 2133# behind Greenwich mean time during the period commencing at two o'clock 2134# in the forenoon on the second Sunday of March and ending at two o'clock 2135# in the forenoon on the first Sunday of November and shall be called 2136# Yukon Daylight Saving Time. 2137# 2138# 2. Order-in-Council 1987/56 is revoked. 2139# 2140# 3. This order comes into force January 1, 2007. 2141# 2142# * Interpretation Act, RSY 2002, c 125 2143# https://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html 2144 2145# From Chris Walton (2022-11-06): 2146# The 5th edition of the Atlas of Canada contains a time zone map that 2147# shows both legislated and observed time zone boundaries. 2148# All communities on Baffin Island are shown to be observing Eastern time. 2149# The date on the map is 1984. 2150# https://ftp.maps.canada.ca/pub/nrcan_rncan/raster/atlas_5_ed/eng/other/referencemaps/mcr4056.pdf 2151 2152# From Rives McDow (1999-09-04): 2153# Nunavut ... moved ... to incorporate the whole territory into one time zone. 2154# Nunavut moves to single time zone Oct. 31 2155# http://www.nunatsiaq.com/nunavut/nvt90903_13.html 2156 2157# From Paul Eggert (1999-09-20): 2158# Basic Facts: The New Territory 2159# http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html 2160# (1999) reports that ... Coral Harbour does not observe DST. 2161 2162# From Paul Eggert (2000-10-02): 2163# Matthews and Vincent (1998) say the following, but we lack histories 2164# for these potential new Zones. 2165# 2166# The Canadian Forces station at Alert uses Eastern Time while the 2167# handful of residents at the Eureka weather station [in the Central 2168# zone] skip daylight savings. Baffin Island, which is crossed by the 2169# Central, Eastern and Atlantic Time zones only uses Eastern Time. 2170# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 2171# Central Time and Southampton Island [in the Central zone] is not 2172# required to use daylight savings. 2173 2174# From <http://www.nunatsiaqonline.ca/archives/nunavut001130/nvt21110_02.html> 2175# Nunavut now has two time zones (2000-11-10): 2176# The Nunavut government would allow its employees in Kugluktuk and 2177# Cambridge Bay to operate on central time year-round, putting them 2178# one hour behind the rest of Nunavut for six months during the winter. 2179# At the end of October the two communities had rebelled against 2180# Nunavut's unified time zone, refusing to shift to eastern time with 2181# the rest of the territory for the winter. Cambridge Bay remained on 2182# central time, while Kugluktuk, even farther west, reverted to 2183# mountain time, which they had used before the advent of Nunavut's 2184# unified time zone in 1999. 2185# 2186# From Rives McDow (2001-01-20), quoting the Nunavut government: 2187# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 2188 2189# From Paul Eggert (2000-12-04): 2190# Let's just keep track of the official times for now. 2191 2192# From Rives McDow (2001-03-07): 2193# The premier of Nunavut has issued a ministerial statement advising 2194# that effective 2001-04-01, the territory of Nunavut will revert 2195# back to three time zones (mountain, central, and eastern). Of the 2196# cities in Nunavut, Coral Harbor is the only one that I know of that 2197# has said it will not observe dst, staying on EST year round. I'm 2198# checking for more info, and will get back to you if I come up with 2199# more. 2200# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 2201 2202# From Gwillim Law (2005-05-21): 2203# According to ... 2204# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 2205# (from a 1998 Canadian Geographic article), the de facto and de jure time 2206# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 2207# round. Using Google, it's easy to find other websites that confirm this. 2208# I wasn't able to find how far back this time regimen goes, but since it 2209# predates the creation of Nunavut, it probably goes back many years.... 2210# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 2211# 2212# From Paul Eggert (2014-10-17): 2213# For lack of better information, assume that Southampton Island observed 2214# daylight saving only during wartime. Gwillim Law's email also 2215# mentioned maps now maintained by National Research Council Canada; 2216# see above for an up-to-date link. 2217 2218# From Chris Walton (2007-03-01): 2219# ... the community of Resolute (located on Cornwallis Island in 2220# Nunavut) moved from Central Time to Eastern Time last November. 2221# Basically the community did not change its clocks at the end of 2222# daylight saving.... 2223# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html 2224 2225# From Chris Walton (2011-03-21): 2226# Back in 2007 I initiated the creation of a new "zone file" for Resolute 2227# Bay. Resolute Bay is a small community located about 900km north of 2228# the Arctic Circle. The zone file was required because Resolute Bay had 2229# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007. 2230# 2231# According to new information which I received last week, Resolute Bay 2232# went back to using UTC-6 in the winter of 2007-2008... 2233# 2234# On March 11/2007 most of Canada went onto daylight saving. On March 2235# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I 2236# talked to somebody that was both knowledgeable and helpful. I was able 2237# to confirm that Resolute Bay was still operating on UTC-5. It was 2238# explained to me that Resolute Bay had been on the Eastern Time zone 2239# (EST) in the winter, and was now back on the Central Time zone (CDT). 2240# i.e. the time zone had changed twice in the last year but the clocks 2241# had not moved. The residents had to know which time zone they were in 2242# so they could follow the correct TV schedule... 2243# 2244# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I 2245# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature 2246# of the phone call, I decided to seek out an alternate source of 2247# information. I found an e-mail address for somebody by the name of 2248# Stephanie Adams whose job was listed as "Inns North Support Officer for 2249# Arctic Co-operatives." I was under the impression that Stephanie lived 2250# and worked in Resolute Bay... 2251# 2252# On March 14/2011 I phoned the hamlet office again. I was told that 2253# Resolute Bay had been using Central Standard Time over the winter of 2254# 2010-2011 and that the clocks had therefore been moved one hour ahead 2255# on March 13/2011. The person I talked to was aware that Resolute Bay 2256# had previously experimented with Eastern Standard Time but he could not 2257# tell me when the practice had stopped. 2258# 2259# On March 17/2011 I searched the Web to find an e-mail address of 2260# somebody that might be able to tell me exactly when Resolute Bay went 2261# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz 2262# used to be the mayor of Resolute Bay and he apparently owns half the 2263# businesses including "South Camp Inn." This website has some info on 2264# Aziz: 2265# http://www.uphere.ca/node/493 2266# 2267# I sent Aziz an e-mail asking when Resolute Bay had stopped using 2268# Eastern Standard Time. 2269# 2270# Aziz responded quickly with this: "hi, The time was not changed for the 2271# 1 year only, the following year, the community went back to the old way 2272# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in 2273# the winter Zulu plus 6 hrs" 2274# 2275# This of course conflicted with everything I had ascertained in November 2008. 2276# 2277# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz 2278# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You 2279# may want to check with the weather office in Resolute Bay or do a 2280# search on the weather through Env. Canada. web site" 2281# 2282# If I had realized the Stephanie did not live in Resolute Bay I would 2283# never have contacted her. I now believe that all the information I 2284# obtained in November 2008 should be ignored... 2285# I apologize for reporting incorrect information in 2008. 2286 2287# From Tim Parenti (2020-03-05): 2288# The government of Yukon announced [yesterday] the cessation of seasonal time 2289# changes. "After clocks are pushed ahead one hour on March 8, the territory 2290# will remain on [UTC-07]. ... [The government] found 93 per cent of 2291# respondents wanted to end seasonal time changes and, of that group, 70 per 2292# cent wanted 'permanent Pacific Daylight Saving Time.'" 2293# https://www.cbc.ca/news/canada/north/yukon-end-daylight-saving-time-1.5486358 2294# 2295# Although the government press release prefers PDT, we prefer MST for 2296# consistency with nearby Dawson Creek, Creston, and Fort Nelson. 2297# https://yukon.ca/en/news/yukon-end-seasonal-time-change 2298 2299# From Andrew G. Smith (2020-09-24): 2300# Yukon has completed its regulatory change to be on UTC -7 year-round.... 2301# http://www.gov.yk.ca/legislation/regs/oic2020_125.pdf 2302# What we have done is re-defined Yukon Standard Time, as we are 2303# authorized to do under section 33 of our Interpretation Act: 2304# http://www.gov.yk.ca/legislation/acts/interpretation_c.pdf 2305# 2306# From Paul Eggert (2020-09-24): 2307# tzdb uses the obsolete YST abbreviation for standard time in Yukon through 2308# about 1970, and uses PST for standard time in Yukon since then. Consistent 2309# with that, use MST for -07, the new standard time in Yukon effective Nov. 1. 2310 2311# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 2312Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 2313Rule NT_YK 1918 only - Oct 27 2:00 0 S 2314Rule NT_YK 1919 only - May 25 2:00 1:00 D 2315Rule NT_YK 1919 only - Nov 1 0:00 0 S 2316Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 2317Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 2318Rule NT_YK 1945 only - Sep 30 2:00 0 S 2319Rule NT_YK 1972 1986 - Apr lastSun 2:00 1:00 D 2320Rule NT_YK 1972 2006 - Oct lastSun 2:00 0 S 2321Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D 2322Rule Yukon 1965 only - Apr lastSun 0:00 2:00 DD 2323Rule Yukon 1965 only - Oct lastSun 2:00 0 S 2324# Zone NAME STDOFF RULES FORMAT [UNTIL] 2325# formerly Frobisher Bay 2326Zone America/Iqaluit 0 - -00 1942 Aug # Frobisher Bay est. 2327 -5:00 NT_YK E%sT 1999 Oct 31 2:00 2328 -6:00 Canada C%sT 2000 Oct 29 2:00 2329 -5:00 Canada E%sT 2330# aka Qausuittuq 2331Zone America/Resolute 0 - -00 1947 Aug 31 # Resolute founded 2332 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2333 -5:00 - EST 2001 Apr 1 3:00 2334 -6:00 Canada C%sT 2006 Oct 29 2:00 2335 -5:00 - EST 2007 Mar 11 3:00 2336 -6:00 Canada C%sT 2337# aka Kangiqiniq 2338Zone America/Rankin_Inlet 0 - -00 1957 # Rankin Inlet founded 2339 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2340 -5:00 - EST 2001 Apr 1 3:00 2341 -6:00 Canada C%sT 2342# aka Iqaluktuuttiaq 2343Zone America/Cambridge_Bay 0 - -00 1920 # trading post est.? 2344 -7:00 NT_YK M%sT 1999 Oct 31 2:00 2345 -6:00 Canada C%sT 2000 Oct 29 2:00 2346 -5:00 - EST 2000 Nov 5 0:00 2347 -6:00 - CST 2001 Apr 1 3:00 2348 -7:00 Canada M%sT 2349Zone America/Inuvik 0 - -00 1953 # Inuvik founded 2350 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 2351 -7:00 NT_YK M%sT 1980 2352 -7:00 Canada M%sT 2353Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 2354 -9:00 NT_YK Y%sT 1965 2355 -9:00 Yukon Y%sT 1966 Feb 27 0:00 2356 -8:00 - PST 1980 2357 -8:00 Canada P%sT 2020 Nov 1 2358 -7:00 - MST 2359Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 2360 -9:00 NT_YK Y%sT 1965 2361 -9:00 Yukon Y%sT 1973 Oct 28 0:00 2362 -8:00 - PST 1980 2363 -8:00 Canada P%sT 2020 Nov 1 2364 -7:00 - MST 2365 2366 2367############################################################################### 2368 2369# Mexico 2370 2371# From Paul Eggert (2014-12-07): 2372# The Investigation and Analysis Service of the 2373# Mexican Library of Congress (MLoC) has published a 2374# history of Mexican local time (in Spanish) 2375# http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm 2376# 2377# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC. 2378# (In all cases we go with the MLoC.) 2379# S&P report that Baja was at -8:00 in 1922/1923. 2380# S&P say the 1930 transition in Baja was 1930-11-16. 2381# S&P report no DST during summer 1931. 2382# S&P report a transition at 1932-03-30 23:00, not 1932-04-01. 2383 2384# From Gwillim Law (2001-02-20): 2385# There are some other discrepancies between the Decrees page and the 2386# tz database. I think they can best be explained by supposing that 2387# the researchers who prepared the Decrees page failed to find some of 2388# the relevant documents. 2389 2390# From Alan Perry (1996-02-15): 2391# A guy from our Mexico subsidiary finally found the Presidential Decree 2392# outlining the timezone changes in Mexico. 2393# 2394# ------------- Begin Forwarded Message ------------- 2395# 2396# I finally got my hands on the Official Presidential Decree that sets up the 2397# rules for the DST changes. The rules are: 2398# 2399# 1. The country is divided in 3 timezones: 2400# - Baja California Norte (the Mexico/BajaNorte TZ) 2401# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 2402# - The rest of the country (the Mexico/General TZ) 2403# 2404# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 2405# at 2:00 AM, the times in each zone are as follows: 2406# BajaNorte: GMT+7 2407# BajaSur: GMT+6 2408# General: GMT+5 2409# 2410# 3. The rest of the year, the times are as follows: 2411# BajaNorte: GMT+8 2412# BajaSur: GMT+7 2413# General: GMT+6 2414# 2415# The Decree was published in Mexico's Official Newspaper on January 4th. 2416# 2417# -------------- End Forwarded Message -------------- 2418# From Paul Eggert (1996-06-12): 2419# For an English translation of the decree, see 2420# "Diario Oficial: Time Zone Changeover" (1996-01-04). 2421# http://mexico-travel.com/extra/timezone_eng.html 2422 2423# From Rives McDow (1998-10-08): 2424# The State of Quintana Roo has reverted back to central STD and DST times 2425# (i.e. UTC -0600 and -0500 as of 1998-08-02). 2426 2427# From Rives McDow (2000-01-10): 2428# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 2429# zone 5 hours from the International Date Line, and will not observe daylight 2430# savings time so as to stay on the same time zone as the southern part of 2431# Arizona year round. 2432 2433# From Jesper N��rgaard, translating 2434# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 2435# In Oaxaca, the 55.000 teachers from the Section 22 of the National 2436# Syndicate of Education Workers, refuse to apply daylight saving each 2437# year, so that the more than 10,000 schools work at normal hour the 2438# whole year. 2439 2440# From Gwillim Law (2001-01-19): 2441# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 2442# (translated):... 2443# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 2444# that Summer Time will be reduced from seven to five months, starting 2445# this year.... 2446# http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001 2447# [translated], says "summer time will ... take effect on the first Sunday 2448# in May, and end on the last Sunday of September. 2449 2450# From Arthur David Olson (2001-01-25): 2451# The 2001-01-24 traditional Washington Post contained the page one 2452# story "Timely Issue Divides Mexicans."... 2453# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 2454# ... Mexico City Mayor L��pez Obrador "...is threatening to keep 2455# Mexico City and its 20 million residents on a different time than 2456# the rest of the country..." In particular, L��pez Obrador would abolish 2457# observation of Daylight Saving Time. 2458 2459# Official statute published by the Energy Department 2460# http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre 2461# (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 2462# and Sonora with no DST. This was reported by Jesper N��rgaard (2001-02-03). 2463 2464# From Paul Eggert (2001-03-03): 2465# 2466# https://www.latimes.com/archives/la-xpm-2001-mar-03-mn-32561-story.html 2467# James F. Smith writes in today's LA Times 2468# * Sonora will continue to observe standard time. 2469# * Last week Mexico City's mayor Andr��s Manuel L��pez Obrador decreed that 2470# the Federal District will not adopt DST. 2471# * 4 of 16 district leaders announced they'll ignore the decree. 2472# * The decree does not affect federal-controlled facilities including 2473# the airport, banks, hospitals, and schools. 2474# 2475# For now we'll assume that the Federal District will bow to federal rules. 2476 2477# From Jesper N��rgaard (2001-04-01): 2478# I found some references to the Mexican application of daylight 2479# saving, which modifies what I had already sent you, stating earlier 2480# that a number of northern Mexican states would go on daylight 2481# saving. The modification reverts this to only cover Baja California 2482# (Norte), while all other states (except Sonora, who has no daylight 2483# saving all year) will follow the original decree of president 2484# Vicente Fox, starting daylight saving May 6, 2001 and ending 2485# September 30, 2001. 2486# References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp> 2487# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 2488 2489# From Reuters (2001-09-04): 2490# Mexico's Supreme Court on Tuesday declared that daylight savings was 2491# unconstitutional in Mexico City, creating the possibility the 2492# capital will be in a different time zone from the rest of the nation 2493# next year.... The Supreme Court's ruling takes effect at 2:00 2494# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 2495# standard time. "This is so residents of the Federal District are not 2496# subject to unexpected time changes," a statement from the court said. 2497 2498# From Jesper N��rgaard Welen (2002-03-12): 2499# ... consulting my local grocery store(!) and my coworkers, they all insisted 2500# that a new decision had been made to reinstate US style DST in Mexico.... 2501# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 2502# confirms this. Sonora as usual is the only state where DST is not applied. 2503 2504# From Steffen Thorsen (2009-12-28): 2505# 2506# Steffen Thorsen wrote: 2507# > Mexico's House of Representatives has approved a proposal for northern 2508# > Mexico's border cities to share the same daylight saving schedule as 2509# > the United States. 2510# Now this has passed both the Congress and the Senate, so starting from 2511# 2010, some border regions will be the same: 2512# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/ 2513# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939 2514# (Spanish) 2515# 2516# Could not find the new law text, but the proposed law text changes are here: 2517# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf 2518# (Gaceta Parlamentaria) 2519# 2520# There is also a list of the votes here: 2521# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html 2522# 2523# Our page: 2524# https://www.timeanddate.com/news/time/north-mexico-dst-change.html 2525 2526# From Arthur David Olson (2010-01-20): 2527# The page 2528# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2529# includes this text: 2530# En los municipios fronterizos de Tijuana y Mexicali en Baja California; 2531# Ju��rez y Ojinaga en Chihuahua; Acu��a y Piedras Negras en Coahuila; 2532# An��huac en Nuevo Le��n; y Nuevo Laredo, Reynosa y Matamoros en 2533# Tamaulipas, la aplicaci��n de este horario estacional surtir�� efecto 2534# desde las dos horas del segundo domingo de marzo y concluir�� a las dos 2535# horas del primer domingo de noviembre. 2536# En los municipios fronterizos que se encuentren ubicados en la franja 2537# fronteriza norte en el territorio comprendido entre la l��nea 2538# internacional y la l��nea paralela ubicada a una distancia de veinte 2539# kil��metros, as�� como la Ciudad de Ensenada, Baja California, hacia el 2540# interior del pa��s, la aplicaci��n de este horario estacional surtir�� 2541# efecto desde las dos horas del segundo domingo de marzo y concluir�� a 2542# las dos horas del primer domingo de noviembre. 2543 2544# From Steffen Thorsen (2014-12-08), translated by Gwillim Law: 2545# The Mexican state of Quintana Roo will likely change to EST in 2015. 2546# 2547# http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo 2548# "With this change, the time conflict that has existed between the municipios 2549# of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an 2550# end. The latter declared itself in rebellion 15 years ago when a time change 2551# was initiated in Mexico, and since then it has refused to change its time 2552# zone along with the rest of the country." 2553# 2554# From Steffen Thorsen (2015-01-14), translated by Gwillim Law: 2555# http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html 2556# "...the new time zone will come into effect at two o'clock on the first Sunday 2557# of February, when we will have to advance the clock one hour from its current 2558# time..." 2559# Also, the new zone will not use DST. 2560# 2561# From Carlos Ra��l Perasso (2015-02-02): 2562# The decree that modifies the Mexican Hour System Law has finally 2563# been published at the Diario Oficial de la Federaci��n 2564# http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015 2565# It establishes 5 zones for Mexico: 2566# 1- Zona Centro (Central Zone): Corresponds to longitude 90 W, 2567# includes most of Mexico, excluding what's mentioned below. 2568# 2- Zona Pac��fico (Pacific Zone): Longitude 105 W, includes the 2569# states of Baja California Sur; Chihuahua; Nayarit (excluding Bah��a 2570# de Banderas which lies in Central Zone); Sinaloa and Sonora. 2571# 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the 2572# state of Baja California. 2573# 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state 2574# of Quintana Roo. 2575# 5- The islands, reefs and keys shall take their timezone from the 2576# longitude they are located at. 2577 2578# From Paul Eggert (2022-10-28): 2579# The new Mexican law was published today: 2580# https://www.dof.gob.mx/nota_detalle.php?codigo=5670045&fecha=28/10/2022 2581# This abolishes DST except where US DST rules are observed, 2582# and in addition changes all of Chihuahua to -06 with no DST. 2583 2584# From Heitor David Pinto (2022-11-28): 2585# Now the northern [municipios] want to have the same time zone as the 2586# respective neighboring cities in the US, for example Ju��rez in UTC-7 with 2587# DST, matching El Paso, and Ojinaga in UTC-6 with DST, matching Presidio.... 2588# the president authorized the publication of the decree for November 29, 2589# so the time change would occur on November 30 at 0:00. 2590# http://puentelibre.mx/noticia/ciudad_juarez_cambio_horario_noviembre_2022/ 2591 2592# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 2593Rule Mexico 1931 only - May 1 23:00 1:00 D 2594Rule Mexico 1931 only - Oct 1 0:00 0 S 2595Rule Mexico 1939 only - Feb 5 0:00 1:00 D 2596Rule Mexico 1939 only - Jun 25 0:00 0 S 2597Rule Mexico 1940 only - Dec 9 0:00 1:00 D 2598Rule Mexico 1941 only - Apr 1 0:00 0 S 2599Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 2600Rule Mexico 1944 only - May 1 0:00 0 S 2601Rule Mexico 1950 only - Feb 12 0:00 1:00 D 2602Rule Mexico 1950 only - Jul 30 0:00 0 S 2603Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 2604Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 2605Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 2606Rule Mexico 2001 only - Sep lastSun 2:00 0 S 2607Rule Mexico 2002 2022 - Apr Sun>=1 2:00 1:00 D 2608Rule Mexico 2002 2022 - Oct lastSun 2:00 0 S 2609# Zone NAME STDOFF RULES FORMAT [UNTIL] 2610# Quintana Roo; represented by Canc��n 2611Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 6:00u 2612 -6:00 - CST 1981 Dec 23 2613 -5:00 Mexico E%sT 1998 Aug 2 2:00 2614 -6:00 Mexico C%sT 2015 Feb 1 2:00 2615 -5:00 - EST 2616# Campeche, Yucat��n; represented by M��rida 2617Zone America/Merida -5:58:28 - LMT 1922 Jan 1 6:00u 2618 -6:00 - CST 1981 Dec 23 2619 -5:00 - EST 1982 Dec 2 2620 -6:00 Mexico C%sT 2621# Coahuila, Nuevo Le��n, Tamaulipas (near US border) 2622# This includes the following municipios: 2623# in Coahuila: Acu��a, Allende, Guerrero, Hidalgo, Jim��nez, Morelos, Nava, 2624# Ocampo, Piedras Negras, Villa Uni��n, Zaragoza 2625# in Nuevo Le��n: An��huac 2626# in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alem��n, Camargo, 2627# Gustavo D��az Ordaz, Reynosa, R��o Bravo, Valle Hermoso, Matamoros. 2628# https://www.dof.gob.mx/nota_detalle.php?codigo=5670045&fecha=28/10/2022 2629Zone America/Matamoros -6:30:00 - LMT 1922 Jan 1 6:00u 2630 -6:00 - CST 1988 2631 -6:00 US C%sT 1989 2632 -6:00 Mexico C%sT 2010 2633 -6:00 US C%sT 2634# Durango; Coahuila, Nuevo Le��n, Tamaulipas (away from US border) 2635Zone America/Monterrey -6:41:16 - LMT 1922 Jan 1 6:00u 2636 -6:00 - CST 1988 2637 -6:00 US C%sT 1989 2638 -6:00 Mexico C%sT 2639# Central Mexico 2640Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 7:00u 2641 -7:00 - MST 1927 Jun 10 23:00 2642 -6:00 - CST 1930 Nov 15 2643 -7:00 Mexico M%sT 1932 Apr 1 2644 -6:00 Mexico C%sT 2001 Sep 30 2:00 2645 -6:00 - CST 2002 Feb 20 2646 -6:00 Mexico C%sT 2647# Chihuahua (near US border - western side) 2648# This includes the municipios of Janos, Ascensi��n, Ju��rez, Guadalupe, and 2649# Pr��xedis G Guerrero. 2650# http://gaceta.diputados.gob.mx/PDF/65/2a022/nov/20221124-VII.pdf 2651Zone America/Ciudad_Juarez -7:05:56 - LMT 1922 Jan 1 7:00u 2652 -7:00 - MST 1927 Jun 10 23:00 2653 -6:00 - CST 1930 Nov 15 2654 -7:00 Mexico M%sT 1932 Apr 1 2655 -6:00 - CST 1996 2656 -6:00 Mexico C%sT 1998 2657 -6:00 - CST 1998 Apr Sun>=1 3:00 2658 -7:00 Mexico M%sT 2010 2659 -7:00 US M%sT 2022 Oct 30 2:00 2660 -6:00 - CST 2022 Nov 30 0:00 2661 -7:00 US M%sT 2662# Chihuahua (near US border - eastern side) 2663# This includes the municipios of Coyame del Sotol, Ojinaga, and Manuel 2664# Benavides. 2665# http://gaceta.diputados.gob.mx/PDF/65/2a022/nov/20221124-VII.pdf 2666Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 7:00u 2667 -7:00 - MST 1927 Jun 10 23:00 2668 -6:00 - CST 1930 Nov 15 2669 -7:00 Mexico M%sT 1932 Apr 1 2670 -6:00 - CST 1996 2671 -6:00 Mexico C%sT 1998 2672 -6:00 - CST 1998 Apr Sun>=1 3:00 2673 -7:00 Mexico M%sT 2010 2674 -7:00 US M%sT 2022 Oct 30 2:00 2675 -6:00 - CST 2022 Nov 30 0:00 2676 -6:00 US C%sT 2677# Chihuahua (away from US border) 2678Zone America/Chihuahua -7:04:20 - LMT 1922 Jan 1 7:00u 2679 -7:00 - MST 1927 Jun 10 23:00 2680 -6:00 - CST 1930 Nov 15 2681 -7:00 Mexico M%sT 1932 Apr 1 2682 -6:00 - CST 1996 2683 -6:00 Mexico C%sT 1998 2684 -6:00 - CST 1998 Apr Sun>=1 3:00 2685 -7:00 Mexico M%sT 2022 Oct 30 2:00 2686 -6:00 - CST 2687# Sonora 2688Zone America/Hermosillo -7:23:52 - LMT 1922 Jan 1 7:00u 2689 -7:00 - MST 1927 Jun 10 23:00 2690 -6:00 - CST 1930 Nov 15 2691 -7:00 Mexico M%sT 1932 Apr 1 2692 -6:00 - CST 1942 Apr 24 2693 -7:00 - MST 1949 Jan 14 2694 -8:00 - PST 1970 2695 -7:00 Mexico M%sT 1999 2696 -7:00 - MST 2697 2698# Baja California Sur, Nayarit (except Bah��a de Banderas), Sinaloa 2699Zone America/Mazatlan -7:05:40 - LMT 1922 Jan 1 7:00u 2700 -7:00 - MST 1927 Jun 10 23:00 2701 -6:00 - CST 1930 Nov 15 2702 -7:00 Mexico M%sT 1932 Apr 1 2703 -6:00 - CST 1942 Apr 24 2704 -7:00 - MST 1949 Jan 14 2705 -8:00 - PST 1970 2706 -7:00 Mexico M%sT 2707 2708# Bah��a de Banderas 2709 2710# From Alexander Krivenyshev (2010-04-21): 2711# According to news, Bah��a de Banderas (Mexican state of Nayarit) 2712# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to 2713# share the same time zone as nearby city Puerto Vallarta, Jalisco). 2714# 2715# (Spanish) 2716# Bah��a de Banderas homologa su horario al del centro del 2717# pa��s, a partir de este domingo 2718# http://www.nayarit.gob.mx/notes.asp?id=20748 2719# 2720# Bah��a de Banderas homologa su horario con el del Centro del 2721# Pa��s 2722# 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 2723# 2724# (English) 2725# Puerto Vallarta and Bah��a de Banderas: One Time Zone 2726# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml 2727# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html 2728# 2729# "Mexico's Senate approved the amendments to the Mexican Schedule System that 2730# will allow Bah��a de Banderas and Puerto Vallarta to share the same time 2731# zone ..." 2732# Baja California Sur, Nayarit, Sinaloa 2733 2734# From Arthur David Olson (2010-05-01): 2735# Use "Bahia_Banderas" to keep the name to fourteen characters. 2736 2737Zone America/Bahia_Banderas -7:01:00 - LMT 1922 Jan 1 7:00u 2738 -7:00 - MST 1927 Jun 10 23:00 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 1949 Jan 14 2743 -8:00 - PST 1970 2744 -7:00 Mexico M%sT 2010 Apr 4 2:00 2745 -6:00 Mexico C%sT 2746 2747# Baja California 2748Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 7:00u 2749 -7:00 - MST 1924 2750 -8:00 - PST 1927 Jun 10 23:00 2751 -7:00 - MST 1930 Nov 15 2752 -8:00 - PST 1931 Apr 1 2753 -8:00 1:00 PDT 1931 Sep 30 2754 -8:00 - PST 1942 Apr 24 2755 -8:00 1:00 PWT 1945 Aug 14 23:00u 2756 -8:00 1:00 PPT 1945 Nov 12 # Peace 2757 -8:00 - PST 1948 Apr 5 2758 -8:00 1:00 PDT 1949 Jan 14 2759 -8:00 - PST 1954 2760 -8:00 CA P%sT 1961 2761 -8:00 - PST 1976 2762 -8:00 US P%sT 1996 2763 -8:00 Mexico P%sT 2001 2764 -8:00 US P%sT 2002 Feb 20 2765 -8:00 Mexico P%sT 2010 2766 -8:00 US P%sT 2767# From Paul Eggert (2006-03-22): 2768# Formerly there was an America/Ensenada zone, which differed from 2769# America/Tijuana only in that it did not observe DST from 1976 2770# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say 2771# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports 2772# that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and 2773# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that 2774# DST-observance was a town-by-town matter back then. This concerns 2775# data after 1970 so most likely there should be at least one Zone 2776# other than America/Tijuana for Baja, but it's not clear yet what its 2777# name or contents should be. 2778# 2779# From Paul Eggert (2015-10-08): 2780# Formerly there was an America/Santa_Isabel zone, but this appears to 2781# have come from a misreading of 2782# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2783# It has been moved to the 'backward' file. 2784# 2785# From Paul Eggert (2022-10-28): 2786# Today's new law states that the entire state of Baja California 2787# follows US DST rules, which agrees with simplifications noted above. 2788# 2789# 2790# Revillagigedo Is 2791# no information 2792 2793############################################################################### 2794 2795# Anguilla 2796# Zone NAME STDOFF RULES FORMAT [UNTIL] 2797Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 2798 -4:00 - AST 2799 2800# Antigua & Barbuda 2801# Zone NAME STDOFF RULES FORMAT [UNTIL] 2802Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 2803 -5:00 - EST 1951 2804 -4:00 - AST 2805 2806# The Bahamas 2807# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 2808Rule Bahamas 1942 only - May 1 24:00 1:00 W 2809Rule Bahamas 1944 only - Dec 31 24:00 0 S 2810Rule Bahamas 1945 only - Feb 1 0:00 1:00 W 2811Rule Bahamas 1945 only - Aug 14 23:00u 1:00 P # Peace 2812Rule Bahamas 1945 only - Oct 17 24:00 0 S 2813Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S 2814Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D 2815 2816# Zone NAME STDOFF RULES FORMAT [UNTIL] 2817Zone America/Nassau -5:09:30 - LMT 1912 Mar 2 2818 -5:00 Bahamas E%sT 1976 2819 -5:00 US E%sT 2820 2821# Barbados 2822 2823# For 1899 Milne gives -3:58:29.2. 2824 2825# From P Chan (2020-12-09 and 2020-12-11): 2826# Standard time of GMT-4 was adopted in 1911. 2827# Definition of Time Act, 1911 (1911-7) [1911-08-28] 2828# 1912, Laws of Barbados (5 v.), OCLC Number: 919801291, Vol. 4, Image No. 522 2829# 1944, Laws of Barbados (5 v.), OCLC Number: 84548697, Vol. 4, Image No. 122 2830# http://llmc.com/browse.aspx?type=2&coll=85&div=297 2831# 2832# DST was observed in 1942-44. 2833# Defence (Daylight Saving) Regulations, 1942, 1942-04-13 2834# Defence (Daylight Saving) (Repeal) Regulations, 1942, 1942-08-22 2835# Defence (Daylight Saving) Regulations, 1943, 1943-04-16 2836# Defence (Daylight Saving) (Repeal) Regulations, 1943, 1943-09-01 2837# Defence (Daylight Saving) Regulations, 1944, 1944-03-21 2838# [Defence (Daylight Saving) (Amendment) Regulations 1944, 1944-03-28] 2839# Defence (Daylight Saving) (Repeal) Regulations, 1944, 1944-08-30 2840# 2841# 1914-, Subsidiary Legis., Annual Vols. OCLC Number: 226290591 2842# 1942: Image Nos. 527-528, 555-556 2843# 1943: Image Nos. 178-179, 198 2844# 1944: Image Nos. 113-115, 129 2845# http://llmc.com/titledescfull.aspx?type=2&coll=85&div=297&set=98437 2846# 2847# From Tim Parenti (2021-02-20): 2848# The transitions below are derived from P Chan's sources, except that the 1977 2849# through 1980 transitions are from Shanks & Pottenger since we have no better 2850# data there. Of particular note, the 1944 DST regulation only advanced the 2851# time to "exactly three and a half hours later than Greenwich mean time", as 2852# opposed to "three hours" in the 1942 and 1943 regulations. 2853 2854# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 2855Rule Barb 1942 only - Apr 19 5:00u 1:00 D 2856Rule Barb 1942 only - Aug 31 6:00u 0 S 2857Rule Barb 1943 only - May 2 5:00u 1:00 D 2858Rule Barb 1943 only - Sep 5 6:00u 0 S 2859Rule Barb 1944 only - Apr 10 5:00u 0:30 - 2860Rule Barb 1944 only - Sep 10 6:00u 0 S 2861Rule Barb 1977 only - Jun 12 2:00 1:00 D 2862Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 2863Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 2864Rule Barb 1979 only - Sep 30 2:00 0 S 2865Rule Barb 1980 only - Sep 25 2:00 0 S 2866# Zone NAME STDOFF RULES FORMAT [UNTIL] 2867 #STDOFF -3:58:29.2 2868Zone America/Barbados -3:58:29 - LMT 1911 Aug 28 # Bridgetown 2869 -4:00 Barb A%sT 1944 2870 -4:00 Barb AST/-0330 1945 2871 -4:00 Barb A%sT 2872 2873# Belize 2874 2875# From P Chan (2020-11-03): 2876# Below are some laws related to the time in British Honduras/Belize: 2877# 2878# Definition of Time Ordinance, 1927 (No.4 of 1927) [1927-04-01] 2879# Ordinances of British Honduras Passed in the Year 1927, p 19-20 2880# https://books.google.com/books?id=LqEpAQAAMAAJ&pg=RA3-PA19 2881# 2882# Definition of Time (Amendment) Ordinance, 1942 (No. 5 of 1942) [1942-06-27] 2883# Ordinances of British Honduras Passed in the Year 1942, p 31-32 2884# https://books.google.com/books?id=h6MpAQAAMAAJ&pg=RA6-PA95-IA44 2885# 2886# Definition of Time Ordinance, 1945 (No. 19 of 1945) [1945-12-15] 2887# Ordinances of British Honduras Passed in the Year 1945, p 49-50 2888# https://books.google.com/books?id=xaMpAQAAMAAJ&pg=RA2-PP1 2889# 2890# Definition of Time Ordinance, 1947 (No. 1 of 1947) [1947-03-11] 2891# Ordinances of British Honduras Passed in the Year 1947, p 1-2 2892# https://books.google.com/books?id=xaMpAQAAMAAJ&pg=RA3-PA1 2893# 2894# Time (Definition of) Ordinance (Chapter 180) 2895# The Laws of British Honduras in Force on the 15th Day of September, 1958 , Volume IV, p 2580 2896# https://books.google.com/books?id=v5QpAQAAMAAJ&pg=PA2580 2897# 2898# Time (Definition of) (Amendment) Ordinance, 1968 (No. 13 of 1968) [1968-08-03] 2899# https://books.google.com/books?id=xij7KEB_58wC&pg=RA1-PA428-IA9 2900# 2901# Definition of Time Act (Chapter 339) 2902# Law of Belize, Revised Edition 2000 2903# http://www.belizelaw.org/web/lawadmin/PDF%20files/cap339.pdf 2904 2905# From Paul Eggert (2020-11-03): 2906# The transitions below are derived from P Chan's sources, except that the 2907# 1973 through 1983 transitions are from Shanks & Pottenger since we have 2908# no better data there. 2909 2910# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 2911Rule Belize 1918 1941 - Oct Sat>=1 24:00 0:30 -0530 2912Rule Belize 1919 1942 - Feb Sat>=8 24:00 0 CST 2913Rule Belize 1942 only - Jun 27 24:00 1:00 CWT 2914Rule Belize 1945 only - Aug 14 23:00u 1:00 CPT 2915Rule Belize 1945 only - Dec 15 24:00 0 CST 2916Rule Belize 1947 1967 - Oct Sat>=1 24:00 0:30 -0530 2917Rule Belize 1948 1968 - Feb Sat>=8 24:00 0 CST 2918Rule Belize 1973 only - Dec 5 0:00 1:00 CDT 2919Rule Belize 1974 only - Feb 9 0:00 0 CST 2920Rule Belize 1982 only - Dec 18 0:00 1:00 CDT 2921Rule Belize 1983 only - Feb 12 0:00 0 CST 2922# Zone NAME STDOFF RULES FORMAT [UNTIL] 2923Zone America/Belize -5:52:48 - LMT 1912 Apr 1 2924 -6:00 Belize %s 2925 2926# Bermuda 2927 2928# From Paul Eggert (2022-07-27): 2929# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower, 2930# Bermuda dockyard, Ireland I. This agrees with standard offset given in the 2931# Daylight Saving Act, 1917 cited below. 2932# It is not known when this time became standard for Bermuda; guess 1890. 2933# The transition to -04 was specified by: 2934# 1930: The Time Zone Act, 1929 (1929: No. 39) [1929-11-08] 2935# https://books.google.com/books?id=7tdMAQAAIAAJ&pg=RA54-PP1 2936 2937# From P Chan (2020-11-20): 2938# Most of the information can be found online from the Bermuda National 2939# Library - Digital Collection which includes The Royal Gazette (RG) until 1957 2940# https://bnl.contentdm.oclc.org/digital/ 2941# I will cite the ID. For example, [10000] means 2942# https://bnl.contentdm.oclc.org/digital/collection/BermudaNP02/id/10000 2943# 2944# 1917: Apr 5 midnight to Sep 30 midnight 2945# Daylight Saving Act, 1917 (1917 No. 13) [1917-04-02] 2946# Bermuda Acts and Resolves 1917, p 37-38 2947# https://books.google.com/books?id=M-lCAQAAMAAJ&pg=PA36-IA2 2948# RG, 1917-04-04, p 6 [42340] gives the spring forward date. 2949# 2950# 1918: Apr 13 midnight to Sep 15 midnight 2951# Daylight Saving Act, 1918 (1918 No. 9) [1918-04-06] 2952# Bermuda Acts and Resolves 1917, p 13 2953# https://books.google.com/books?id=K-lCAQAAMAAJ&pg=RA1-PA7 2954# 2955# Note that local mean time was still used before 1930. 2956# 2957# During WWII, DST was introduced by Defence Regulations 2958# 1942: Jan 11 02:00 to Oct 18 02:00 [113646], [115726] 2959# 1943: Mar 21 02:00 to Oct 31 02:00 [116704], [118193] 2960# 1944: Mar 12 02:00 to Nov 5 02:00 [119225], [121593] 2961# 1945: Mar 11 02:00 to Nov 4 02:00 [122369], [124461] 2962# RG, 1942-01-08, p 2, 1942-10-12, p 2 , 1943-03-06, p 2, 1943-09-03, p 1, 2963# 1944-02-29, p 6, 1944-09-20, p 2, 1945-02-13, p 2, 1945-11-03, p 1 2964# 2965# In 1946, the House of Assembly rejected DST twice. [128686], [128076] 2966# RG, 1946-03-16 p 1,1946-04-13 p 1 2967# 2968# 1947: third Sunday in May 02:00 to second Sunday in September 02:00 2969# DST in 1947 was defined in the Daylight Saving Act, 1947 (1947: No. 12) 2970# which expired at the end of the year. [125784] ,[132405], [144454], [138226] 2971# RG, 1947-02-27, p 1, 1947-05-15, p 1, 1947-09-13, p 1, 1947-12-30, p 1 2972# 2973# 1948-1952: fourth Sunday in May 02:00 to first Sunday in September 02:00 2974# DST in 1948 was defined in the Daylight Saving Act, 1948 (1948 : No. 12) 2975# which was set to expired at the end of the year but it was extended until 2976# the end of 1952 and was not further extended. 2977# [129802], [139403], [146008], [135240], [144330], [139049], [143309], 2978# [148271], [149773], [153589], [153802], [155924] 2979# RG, 1948-04-13, p 1, 1948-05-22, p 1, 1948-09-04, p 1, 1949-05-21, p1, 2980# 1949-09-03, p 1, 1950-05-27 p 1, 1950-09-02, p 1, 1951-05-27, p 1, 2981# 1951-09-01, p 1, 1952-05-23, p 1, 1952-09-26, p 1, 1952-12-21, p 8 2982# 2983# In 1953-1955, the House of Assembly rejected DST each year. [158996], 2984# [162620], [166720] RG, 1953-05-02, p 1, 1954-04-01 p 1, 1955-03-12, p 1 2985# 2986# 1956: fourth Sunday in May 02:00 to last Sunday in October 02:00 2987# Time Zone (Seasonal Variation) Act, 1956 (1956: No.44) [1956-05-25] 2988# Bermuda Public Acts 1956, p 331-332 2989# https://books.google.com/books?id=Xs1AlmD_cEwC&pg=PA63 2990# 2991# The extension of the Act was rejected by the House of Assembly. [176218] 2992# RG, 1956-12-13, p 1 2993# 2994# From the Chronological Table of Public and Private Acts up to 1985, it seems 2995# that there does not exist other Acts related to DST before 1973. 2996# https://books.google.com/books?id=r9hMAQAAIAAJ&pg=RA23-PA1 2997# Public Acts of the Legislature of the Islands of Bermuda, Together with 2998# Statutory Instruments in Force Thereunder, Vol VII 2999 3000# From Dan Jones, reporting in The Royal Gazette (2006-06-26): 3001# Next year, however, clocks in the US will go forward on the second Sunday 3002# in March, until the first Sunday in November. And, after the Time Zone 3003# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on 3004# Friday, the same thing will happen in Bermuda. 3005# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135 3006 3007# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3008Rule Bermuda 1917 only - Apr 5 24:00 1:00 - 3009Rule Bermuda 1917 only - Sep 30 24:00 0 - 3010Rule Bermuda 1918 only - Apr 13 24:00 1:00 - 3011Rule Bermuda 1918 only - Sep 15 24:00 0 S 3012Rule Bermuda 1942 only - Jan 11 2:00 1:00 D 3013Rule Bermuda 1942 only - Oct 18 2:00 0 S 3014Rule Bermuda 1943 only - Mar 21 2:00 1:00 D 3015Rule Bermuda 1943 only - Oct 31 2:00 0 S 3016Rule Bermuda 1944 1945 - Mar Sun>=8 2:00 1:00 D 3017Rule Bermuda 1944 1945 - Nov Sun>=1 2:00 0 S 3018Rule Bermuda 1947 only - May Sun>=15 2:00 1:00 D 3019Rule Bermuda 1947 only - Sep Sun>=8 2:00 0 S 3020Rule Bermuda 1948 1952 - May Sun>=22 2:00 1:00 D 3021Rule Bermuda 1948 1952 - Sep Sun>=1 2:00 0 S 3022Rule Bermuda 1956 only - May Sun>=22 2:00 1:00 D 3023Rule Bermuda 1956 only - Oct lastSun 2:00 0 S 3024 3025# Zone NAME STDOFF RULES FORMAT [UNTIL] 3026 #STDOFF -4:19:18.3 3027Zone Atlantic/Bermuda -4:19:18 - LMT 1890 # Hamilton 3028 -4:19:18 Bermuda BMT/BST 1930 Jan 1 2:00 3029 -4:00 Bermuda A%sT 1974 Apr 28 2:00 3030 -4:00 Canada A%sT 1976 3031 -4:00 US A%sT 3032 3033# Caribbean Netherlands 3034# See America/Kralendijk in southamerica. 3035 3036# Cayman Is 3037# Zone NAME STDOFF RULES FORMAT [UNTIL] 3038Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 3039 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3040 -5:00 - EST 3041 3042# Costa Rica 3043 3044# Milne gives -5:36:13.3 as San Jos�� mean time. 3045 3046# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3047Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 3048Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 3049Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 3050# IATA SSIM (1991-09) says the following was at 1:00; 3051# go with Shanks & Pottenger. 3052Rule CR 1991 only - Jul 1 0:00 0 S 3053Rule CR 1992 only - Mar 15 0:00 0 S 3054# There are too many San Jos��s elsewhere, so we'll use 'Costa Rica'. 3055# Zone NAME STDOFF RULES FORMAT [UNTIL] 3056 #STDOFF -5:36:13.3 3057Zone America/Costa_Rica -5:36:13 - LMT 1890 # San Jos�� 3058 -5:36:13 - SJMT 1921 Jan 15 # San Jos�� Mean Time 3059 -6:00 CR C%sT 3060# Coco 3061# no information; probably like America/Costa_Rica 3062 3063# Cuba 3064 3065# From Paul Eggert (2013-02-21): 3066# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57 3067# for the port, and -5:30 for meteorological observations. 3068# For now, stick with Shanks & Pottenger. 3069 3070# From Arthur David Olson (1999-03-29): 3071# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 3072# the Cuban National Team and the Baltimore Orioles was carried live on 3073# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 3074# During the game, play-by-play announcer Jim Hunter noted that 3075# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 3076# Time today." (The "two hour" remark referred to losing one hour of 3077# sleep on 1999-03-28 - when the announcers were in Cuba as it switched 3078# to DST - and one more hour on 1999-04-04 - when the announcers will have 3079# returned to Baltimore, which switches on that date.) 3080 3081# From Steffen Thorsen (2013-11-11): 3082# DST start in Cuba in 2004 ... does not follow the same rules as the 3083# years before. The correct date should be Sunday 2004-03-28 00:00 ... 3084# https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html 3085 3086# From Evert van der Veer via Steffen Thorsen (2004-10-28): 3087# Cuba is not going back to standard time this year. 3088# From Paul Eggert (2006-03-22): 3089# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 3090# says that it's due to a problem at the Antonio Guiteras 3091# thermoelectric plant, and says "This October there will be no return 3092# to normal hours (after daylight saving time)". 3093# For now, let's assume that it's a temporary measure. 3094 3095# From Carlos A. Carnero Delgado (2005-11-12): 3096# This year (just like in 2004-2005) there's no change in time zone 3097# adjustment in Cuba. We will stay in daylight saving time: 3098# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html 3099 3100# From Jesper N��rgaard Welen (2006-10-21): 3101# An article in GRANMA INTERNACIONAL claims that Cuba will end 3102# the 3 years of permanent DST next weekend, see 3103# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html 3104# "On Saturday night, October 28 going into Sunday, October 29, at 01:00, 3105# watches should be set back one hour - going back to 00:00 hours - returning 3106# to the normal schedule.... 3107 3108# From Paul Eggert (2007-03-02): 3109# <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday, 3110# says Cuban clocks will advance at midnight on March 10. 3111# For lack of better information, assume Cuba will use US rules, 3112# except that it switches at midnight standard time as usual. 3113# 3114# From Steffen Thorsen (2007-10-25): 3115# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week 3116# earlier - on the last Sunday of October, just like in 2006. 3117# 3118# He supplied these references: 3119# 3120# http://www.prensalatina.com.mx/article.asp?ID={4CC32C1B-A9F7-42FB-8A07-8631AFC923AF}&language=ES 3121# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm 3122# 3123# From Alex Krivenyshev (2007-10-25): 3124# Here is also article from Granma (Cuba): 3125# 3126# Regir�� el Horario Normal desde el pr��ximo domingo 28 de octubre 3127# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html 3128# 3129# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html 3130 3131# From Arthur David Olson (2008-03-09): 3132# I'm in Maryland which is now observing United States Eastern Daylight 3133# Time. At 9:44 local time I used RealPlayer to listen to 3134# http://media.enet.cu/radioreloj 3135# a Cuban information station, and heard 3136# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"), 3137# indicating that Cuba is still on standard time. 3138 3139# From Steffen Thorsen (2008-03-12): 3140# It seems that Cuba will start DST on Sunday, 2007-03-16... 3141# It was announced yesterday, according to this source (in Spanish): 3142# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm 3143# 3144# Some more background information is posted here: 3145# https://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html 3146# 3147# The article also says that Cuba has been observing DST since 1963, 3148# while Shanks (and tzdata) has 1965 as the first date (except in the 3149# 1940's). Many other web pages in Cuba also claim that it has been 3150# observed since 1963, but with the exception of 1970 - an exception 3151# which is not present in tzdata/Shanks. So there is a chance we need to 3152# change some historic records as well. 3153# 3154# One example: 3155# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm 3156 3157# From Jesper N��rgaard Welen (2008-03-13): 3158# The Cuban time change has just been confirmed on the most authoritative 3159# web site, the Granma. Please check out 3160# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html 3161# 3162# Basically as expected after Steffen Thorsen's information, the change 3163# will take place midnight between Saturday and Sunday. 3164 3165# From Arthur David Olson (2008-03-12): 3166# Assume Sun>=15 (third Sunday) going forward. 3167 3168# From Alexander Krivenyshev (2009-03-04) 3169# According to the Radio Reloj - Cuba will start Daylight Saving Time on 3170# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009- 3171# not on midnight March 14 / March 15 as previously thought. 3172# 3173# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html 3174# (in Spanish) 3175 3176# From Arthur David Olson (2009-03-09) 3177# I listened over the Internet to 3178# http://media.enet.cu/readioreloj 3179# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the 3180# the time was announced as "diez cinco" - the same time as here, indicating 3181# that has indeed switched to DST. Assume second Sunday from 2009 forward. 3182 3183# From Steffen Thorsen (2011-03-08): 3184# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00 3185# this year. Nothing about the end date known so far (if that has 3186# changed at all). 3187# 3188# Source: 3189# http://granma.co.cu/2011/03/08/nacional/artic01.html 3190# 3191# Our info: 3192# https://www.timeanddate.com/news/time/cuba-starts-dst-2011.html 3193# 3194# From Steffen Thorsen (2011-10-30) 3195# Cuba will end DST two weeks later this year. Instead of going back 3196# tonight, it has been delayed to 2011-11-13 at 01:00. 3197# 3198# One source (Spanish) 3199# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html 3200# 3201# Our page: 3202# https://www.timeanddate.com/news/time/cuba-time-changes-2011.html 3203# 3204# From Steffen Thorsen (2012-03-01) 3205# According to Radio Reloj, Cuba will start DST on Midnight between March 3206# 31 and April 1. 3207# 3208# Radio Reloj has the following info (Spanish): 3209# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril 3210# 3211# Our info on it: 3212# https://www.timeanddate.com/news/time/cuba-starts-dst-2012.html 3213 3214# From Steffen Thorsen (2012-11-03): 3215# Radio Reloj and many other sources report that Cuba is changing back 3216# to standard time on 2012-11-04: 3217# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre 3218# From Paul Eggert (2012-11-03): 3219# For now, assume the future rule is first Sunday in November. 3220 3221# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3222Rule Cuba 1928 only - Jun 10 0:00 1:00 D 3223Rule Cuba 1928 only - Oct 10 0:00 0 S 3224Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 3225Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 3226Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 3227Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 3228Rule Cuba 1965 only - Jun 1 0:00 1:00 D 3229Rule Cuba 1965 only - Sep 30 0:00 0 S 3230Rule Cuba 1966 only - May 29 0:00 1:00 D 3231Rule Cuba 1966 only - Oct 2 0:00 0 S 3232Rule Cuba 1967 only - Apr 8 0:00 1:00 D 3233Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 3234Rule Cuba 1968 only - Apr 14 0:00 1:00 D 3235Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 3236Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 3237Rule Cuba 1972 1974 - Oct 8 0:00 0 S 3238Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 3239Rule Cuba 1978 only - May 7 0:00 1:00 D 3240Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 3241Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 3242Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 3243Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 3244Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 3245Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 3246Rule Cuba 1996 only - Oct 6 0:00s 0 S 3247Rule Cuba 1997 only - Oct 12 0:00s 0 S 3248Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 3249Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 3250Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D 3251Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D 3252Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S 3253Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D 3254Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D 3255Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D 3256Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D 3257Rule Cuba 2011 only - Nov 13 0:00s 0 S 3258Rule Cuba 2012 only - Apr 1 0:00s 1:00 D 3259Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S 3260Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D 3261 3262# Zone NAME STDOFF RULES FORMAT [UNTIL] 3263Zone America/Havana -5:29:28 - LMT 1890 3264 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 3265 -5:00 Cuba C%sT 3266 3267# Dominica 3268# Zone NAME STDOFF RULES FORMAT [UNTIL] 3269Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 3270 -4:00 - AST 3271 3272# Dominican Republic 3273 3274# From Steffen Thorsen (2000-10-30): 3275# Enrique Morales reported to me that the Dominican Republic has changed the 3276# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 3277# http://www.listin.com.do/antes/261000/republica/princi.html 3278 3279# From Paul Eggert (2000-12-04): 3280# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 3281 3282# From Rives McDow (2000-12-01): 3283# Dominican Republic changed its mind and presidential decree on Tuesday, 3284# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 3285# Dominican Republic will be reverting to 8 hours from the International Date 3286# Line, and will not be using DST in the foreseeable future. The reason they 3287# decided to use DST was to be in synch with Puerto Rico, who was also going 3288# to implement DST. When Puerto Rico didn't implement DST, the president 3289# decided to revert. 3290 3291 3292# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3293Rule DR 1966 only - Oct 30 0:00 1:00 EDT 3294Rule DR 1967 only - Feb 28 0:00 0 EST 3295Rule DR 1969 1973 - Oct lastSun 0:00 0:30 -0430 3296Rule DR 1970 only - Feb 21 0:00 0 EST 3297Rule DR 1971 only - Jan 20 0:00 0 EST 3298Rule DR 1972 1974 - Jan 21 0:00 0 EST 3299# Zone NAME STDOFF RULES FORMAT [UNTIL] 3300Zone America/Santo_Domingo -4:39:36 - LMT 1890 3301 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 3302 -5:00 DR %s 1974 Oct 27 3303 -4:00 - AST 2000 Oct 29 2:00 3304 -5:00 US E%sT 2000 Dec 3 1:00 3305 -4:00 - AST 3306 3307# El Salvador 3308 3309# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3310Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 3311Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 3312# There are too many San Salvadors elsewhere, so use America/El_Salvador 3313# instead of America/San_Salvador. 3314# Zone NAME STDOFF RULES FORMAT [UNTIL] 3315Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 3316 -6:00 Salv C%sT 3317 3318# Grenada 3319# Zone NAME STDOFF RULES FORMAT [UNTIL] 3320Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 3321 -4:00 - AST 3322 3323# Guadeloupe 3324# Zone NAME STDOFF RULES FORMAT [UNTIL] 3325Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe-��-Pitre 3326 -4:00 - AST 3327 3328# St Barth��lemy 3329# See America/St_Barthelemy in southamerica. 3330 3331# St Martin (French part) 3332# See America/Marigot in southamerica. 3333 3334# Guatemala 3335# 3336# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen: 3337# Diario Co Latino, at 3338# <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>, 3339# says in an article dated 2006-04-19 that the Guatemalan government had 3340# decided on that date to advance official time by 60 minutes, to lessen the 3341# impact of the elevated cost of oil.... Daylight saving time will last from 3342# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified). 3343# From Paul Eggert (2006-06-22): 3344# The Ministry of Energy and Mines, press release CP-15/2006 3345# (2006-04-19), says DST ends at 24:00. See 3346# http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf 3347 3348# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3349Rule Guat 1973 only - Nov 25 0:00 1:00 D 3350Rule Guat 1974 only - Feb 24 0:00 0 S 3351Rule Guat 1983 only - May 21 0:00 1:00 D 3352Rule Guat 1983 only - Sep 22 0:00 0 S 3353Rule Guat 1991 only - Mar 23 0:00 1:00 D 3354Rule Guat 1991 only - Sep 7 0:00 0 S 3355Rule Guat 2006 only - Apr 30 0:00 1:00 D 3356Rule Guat 2006 only - Oct 1 0:00 0 S 3357# Zone NAME STDOFF RULES FORMAT [UNTIL] 3358Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 3359 -6:00 Guat C%sT 3360 3361# Haiti 3362# From Gwillim Law (2005-04-15): 3363# Risto O. Nyk��nen wrote me that Haiti is now on DST. 3364# I searched for confirmation, and I found a press release 3365# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 3366# <http://www.haitianconsulate.org/time.doc>. Translated from French, it says: 3367# 3368# "The Prime Minister's Communication Office notifies the public in general 3369# and the press in particular that, following a decision of the Interior 3370# Ministry and the Territorial Collectivities [I suppose that means the 3371# provinces], Haiti will move to Eastern Daylight Time in the night from next 3372# Saturday the 2nd to Sunday the 3rd. 3373# 3374# "Consequently, the Prime Minister's Communication Office wishes to inform 3375# the population that the country's clocks will be set forward one hour 3376# starting at midnight. This provision will hold until the last Saturday in 3377# October 2005. 3378# 3379# "Port-au-Prince, March 31, 2005" 3380# 3381# From Steffen Thorsen (2006-04-04): 3382# I have been informed by users that Haiti observes DST this year like 3383# last year, so the current "only" rule for 2005 might be changed to a 3384# "max" rule or to last until 2006. (Who knows if they will observe DST 3385# next year or if they will extend their DST like US/Canada next year). 3386# 3387# I have found this article about it (in French): 3388# http://www.haitipressnetwork.com/news.cfm?articleID=7612 3389# 3390# The reason seems to be an energy crisis. 3391 3392# From Stephen Colebourne (2007-02-22): 3393# Some IATA info: Haiti won't be having DST in 2007. 3394 3395# From Steffen Thorsen (2012-03-11): 3396# According to several news sources, Haiti will observe DST this year, 3397# apparently using the same start and end date as USA/Canada. 3398# So this means they have already changed their time. 3399# 3400# http://www.alterpresse.org/spip.php?article12510 3401# http://radiovision2000haiti.net/home/?p=13253 3402# 3403# From Arthur David Olson (2012-03-11): 3404# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to 3405# 3:00 a.m. rather than the traditional Haitian jump at midnight. 3406# Assume a US-style fall back as well. 3407 3408# From Steffen Thorsen (2013-03-10): 3409# It appears that Haiti is observing DST this year as well, same rules 3410# as US/Canada. They did it last year as well, and it looks like they 3411# are going to observe DST every year now... 3412# 3413# http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/ 3414# http://www.canalplushaiti.net/?p=6714 3415 3416# From Steffen Thorsen (2016-03-12): 3417# Jean Antoine, editor of www.haiti-reference.com informed us that Haiti 3418# are not going on DST this year. Several other resources confirm this: ... 3419# https://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html 3420# https://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/ 3421# http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/ 3422 3423# From Steffen Thorsen (2017-03-12): 3424# We have received 4 mails from different people telling that Haiti 3425# has started DST again today, and this source seems to confirm that, 3426# I have not been able to find a more authoritative source: 3427# https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html 3428 3429# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3430Rule Haiti 1983 only - May 8 0:00 1:00 D 3431Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 3432Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 3433# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. 3434# Go with IATA. 3435Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 3436Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 3437Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D 3438Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S 3439Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D 3440Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S 3441Rule Haiti 2017 max - Mar Sun>=8 2:00 1:00 D 3442Rule Haiti 2017 max - Nov Sun>=1 2:00 0 S 3443# Zone NAME STDOFF RULES FORMAT [UNTIL] 3444Zone America/Port-au-Prince -4:49:20 - LMT 1890 3445 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 3446 -5:00 Haiti E%sT 3447 3448# Honduras 3449# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1. 3450 3451# From Paul Eggert (2006-05-05): 3452# worldtimezone.com reports a 2006-05-02 Spanish-language AP article 3453# saying Honduras will start using DST midnight Saturday, effective 4 3454# months until September. La Tribuna reported today 3455# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president 3456# of Honduras, refused to back down on this. 3457 3458# From Jesper N��rgaard Welen (2006-08-08): 3459# It seems that Honduras has returned from DST to standard time this Monday at 3460# 00:00 hours (prolonging Sunday to 25 hours duration). 3461# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html 3462 3463# From Paul Eggert (2006-08-08): 3464# Also see Diario El Heraldo, The country returns to standard time (2006-08-08). 3465# http://www.elheraldo.hn/nota.php?nid=54941&sec=12 3466# It mentions executive decree 18-2006. 3467 3468# From Steffen Thorsen (2006-08-17): 3469# Honduras will observe DST from 2007 to 2009, exact dates are not 3470# published, I have located this authoritative source: 3471# http://www.presidencia.gob.hn/noticia.aspx?nId=47 3472 3473# From Steffen Thorsen (2007-03-30): 3474# http://www.laprensahn.com/pais_nota.php?id04962=7386 3475# So it seems that Honduras will not enter DST this year.... 3476 3477# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3478Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D 3479Rule Hond 1987 1988 - Sep lastSun 0:00 0 S 3480Rule Hond 2006 only - May Sun>=1 0:00 1:00 D 3481Rule Hond 2006 only - Aug Mon>=1 0:00 0 S 3482# Zone NAME STDOFF RULES FORMAT [UNTIL] 3483Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 3484 -6:00 Hond C%sT 3485# 3486# Great Swan I ceded by US to Honduras in 1972 3487 3488# Jamaica 3489# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an 3490# unspecified official document, and says "This time is used throughout the 3491# island". Go with Milne. 3492# 3493# Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but 3494# Lance Neita writes that Prime Minister Michael Manley decreed it January 5. 3495# Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that 3496# Manley's supporters associated this act with Manley's nickname "Joshua" 3497# (recall that in the Bible the sun stood still at Joshua's request), 3498# and with the Rod of Correction which Manley said he had received from 3499# Haile Selassie, Emperor of Ethiopia. See: 3500# Neita L. The politician in all of us. Jamaica Observer 2014-09-20 3501# http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647 3502# 3503# Zone NAME STDOFF RULES FORMAT [UNTIL] 3504 #STDOFF -5:07:10.41 3505Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston 3506 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3507 -5:00 - EST 1974 3508 -5:00 US E%sT 1984 3509 -5:00 - EST 3510 3511# Martinique 3512# Zone NAME STDOFF RULES FORMAT [UNTIL] 3513Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 3514 -4:04:20 - FFMT 1911 May 1 # Fort-de-France MT 3515 -4:00 - AST 1980 Apr 6 3516 -4:00 1:00 ADT 1980 Sep 28 3517 -4:00 - AST 3518 3519# Montserrat 3520# Zone NAME STDOFF RULES FORMAT [UNTIL] 3521Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Cork Hill 3522 -4:00 - AST 3523 3524# Nicaragua 3525# 3526# This uses Shanks & Pottenger for times before 2005. 3527# 3528# From Steffen Thorsen (2005-04-12): 3529# I've got reports from 8 different people that Nicaragua just started 3530# DST on Sunday 2005-04-10, in order to save energy because of 3531# expensive petroleum. The exact end date for DST is not yet 3532# announced, only "September" but some sites also say "mid-September". 3533# Some background information is available on the President's official site: 3534# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 3535# The Decree, no 23-2005 is available here: 3536# 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 3537# 3538# From Paul Eggert (2005-05-01): 3539# The decree doesn't say anything about daylight saving, but for now let's 3540# assume that it is daylight saving.... 3541# 3542# From Gwillim Law (2005-04-21): 3543# The Associated Press story on the time change, which can be found at 3544# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 3545# and elsewhere, says (fifth paragraph, translated from Spanish): "The last 3546# time that a change of clocks was applied to save energy was in the year 2000 3547# during the Arnoldo Alem��n administration."... 3548# The northamerica file says that Nicaragua has been on UTC-6 continuously 3549# since December 1998. I wasn't able to find any details of Nicaraguan time 3550# changes in 2000. Perhaps a note could be added to the northamerica file, to 3551# the effect that we have indirect evidence that DST was observed in 2000. 3552# 3553# From Jesper N��rgaard Welen (2005-11-02): 3554# Nicaragua left DST the 2005-10-02 at 00:00 (local time). 3555# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm 3556# (2005-09-26) 3557# 3558# From Jesper N��rgaard Welen (2006-05-05): 3559# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410 3560# (my informal translation) 3561# By order of the president of the republic, Enrique Bola��os, Nicaragua 3562# advanced by sixty minutes their official time, yesterday at 2 in the 3563# morning, and will stay that way until 30th of September. 3564# 3565# From Jesper N��rgaard Welen (2006-09-30): 3566# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf 3567# My informal translation runs: 3568# The natural sun time is restored in all the national territory, in that the 3569# time is returned one hour at 01:00 am of October 1 of 2006. 3570# 3571# Rule NAME FROM TO - IN ON AT SAVE LETTER/S 3572Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 3573Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 3574Rule Nic 2005 only - Apr 10 0:00 1:00 D 3575Rule Nic 2005 only - Oct Sun>=1 0:00 0 S 3576Rule Nic 2006 only - Apr 30 2:00 1:00 D 3577Rule Nic 2006 only - Oct Sun>=1 1:00 0 S 3578# Zone NAME STDOFF RULES FORMAT [UNTIL] 3579Zone America/Managua -5:45:08 - LMT 1890 3580 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 3581 -6:00 - CST 1973 May 3582 -5:00 - EST 1975 Feb 16 3583 -6:00 Nic C%sT 1992 Jan 1 4:00 3584 -5:00 - EST 1992 Sep 24 3585 -6:00 - CST 1993 3586 -5:00 - EST 1997 3587 -6:00 Nic C%sT 3588 3589# Panama 3590# Zone NAME STDOFF RULES FORMAT [UNTIL] 3591Zone America/Panama -5:18:08 - LMT 1890 3592 -5:19:36 - CMT 1908 Apr 22 # Col��n Mean Time 3593 -5:00 - EST 3594 3595# Puerto Rico 3596# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'. 3597# Zone NAME STDOFF RULES FORMAT [UNTIL] 3598Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 3599 -4:00 - AST 1942 May 3 3600 -4:00 US A%sT 1946 3601 -4:00 - AST 3602 3603# St Kitts-Nevis 3604# Zone NAME STDOFF RULES FORMAT [UNTIL] 3605Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 3606 -4:00 - AST 3607 3608# St Lucia 3609# Zone NAME STDOFF RULES FORMAT [UNTIL] 3610Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 3611 -4:04:00 - CMT 1912 # Castries Mean Time 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 - -03 1987 3620 -3:00 Canada -03/-02 3621 3622# St Vincent & the Grenadines 3623# Zone NAME STDOFF RULES FORMAT [UNTIL] 3624Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 3625 -4:04:56 - KMT 1912 # Kingstown Mean Time 3626 -4:00 - AST 3627 3628# Sint Maarten 3629# See America/Lower_Princes in southamerica. 3630 3631# Turks and Caicos 3632# 3633# From Chris Dunn in 3634# https://bugs.debian.org/415007 3635# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the 3636# daylight saving dates for time changes have been adjusted to match 3637# the recent U.S. change of dates. 3638# 3639# From Brian Inglis (2007-04-28): 3640# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26] 3641# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three 3642# rows before that there is an out of date entry for Oct: 3643# "Eastern Standard Times Begins 2007 3644# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time" 3645# indicating that the normal ET rules are followed. 3646 3647# From Paul Eggert (2014-08-19): 3648# The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See: 3649# http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm 3650# Model this as a switch from EST/EDT to AST ... 3651# From Chris Walton (2014-11-04): 3652# ... the TCI government appears to have delayed the switch to 3653# "permanent daylight saving time" by one year.... 3654# http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm 3655# 3656# From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen: 3657# ... agreed to the reintroduction in TCI of Daylight Saving Time (DST) 3658# during the summer months and Standard Time, also known as Local 3659# Time, during the winter months with effect from April 2018 ... 3660# https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3 3661# From Paul Eggert (2017-08-26): 3662# The date of effect of the spring 2018 change appears to be March 11, 3663# which makes more sense. See: Hamilton D. Time change back 3664# by March 2018 for TCI. Magnetic Media. 2017-08-25. 3665# http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/ 3666# 3667# From P Chan (2020-11-27): 3668# Standard Time Declaration Order 2015 (L.N. 15/2015) 3669# http://online.fliphtml5.com/fizd/czin/#p=2 3670# 3671# Standard Time Declaration Order 2017 (L.N. 31/2017) 3672# http://online.fliphtml5.com/fizd/dmcu/#p=2 3673# 3674# From Tim Parenti (2020-12-05): 3675# Although L.N. 31/2017 reads that it "shall come into operation at 2:00 a.m. 3676# on 11th March 2018", a precise interpretation here poses some problems. The 3677# order states that "the standard time to be observed throughout the Turks and 3678# Caicos Islands shall be the same time zone as the Eastern United States of 3679# America" and further clarifies "[f]or the avoidance of doubt" that it 3680# "applies to the Eastern Standard Time as well as any changes thereto for 3681# Daylight Saving Time." However, as clocks in Turks and Caicos approached 3682# 02:00 -04, and thus the declared implementation time, it was still 01:00 EST 3683# (-05), as DST in the Eastern US would not start until an hour later. 3684# 3685# Since it is unlikely that those on the islands switched their clocks twice in 3686# the span of an hour, we assume instead that the adoption of EDT actually took 3687# effect once clocks in the Eastern US had sprung forward, from 03:00 -04. 3688# This discrepancy only affects the time zone abbreviation and DST flag for the 3689# intervening hour, not wall clock times, as -04 was maintained throughout. 3690 3691# Zone NAME STDOFF RULES FORMAT [UNTIL] 3692Zone America/Grand_Turk -4:44:32 - LMT 1890 3693 #STDOFF -5:07:10.41 3694 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3695 -5:00 - EST 1979 3696 -5:00 US E%sT 2015 Mar 8 2:00 3697 -4:00 - AST 2018 Mar 11 3:00 3698 -5:00 US E%sT 3699 3700# British Virgin Is 3701# Zone NAME STDOFF RULES FORMAT [UNTIL] 3702Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 3703 -4:00 - AST 3704 3705# US Virgin Is 3706# Zone NAME STDOFF RULES FORMAT [UNTIL] 3707Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 3708 -4:00 - AST 3709 3710# Local Variables: 3711# coding: utf-8 3712# End: 3713