1# 2# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3# 4# This code is free software; you can redistribute it and/or modify it 5# under the terms of the GNU General Public License version 2 only, as 6# published by the Free Software Foundation. Oracle designates this 7# particular file as subject to the "Classpath" exception as provided 8# by Oracle in the LICENSE file that accompanied this code. 9# 10# This code is distributed in the hope that it will be useful, but WITHOUT 11# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13# version 2 for more details (a copy is included in the LICENSE file that 14# accompanied this code). 15# 16# You should have received a copy of the GNU General Public License version 17# 2 along with this work; if not, write to the Free Software Foundation, 18# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19# 20# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21# or visit www.oracle.com if you need additional information or have any 22# questions. 23# 24# tzdb data for North and Central America and environs 25 26# This file is in the public domain, so clarified as of 27# 2009-05-17 by Arthur David Olson. 28 29# also includes Central America and the Caribbean 30 31# This file is by no means authoritative; if you think you know better, 32# go ahead and edit the file (and please send any changes to 33# tz@iana.org for general use in the future). For more, please see 34# the file CONTRIBUTING in the tz distribution. 35 36# From Paul Eggert (1999-03-22): 37# A reliable and entertaining source about time zones is 38# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 39 40############################################################################### 41 42# United States 43 44# From Paul Eggert (1999-03-31): 45# Howse writes (pp 121-125) that time zones were invented by 46# Professor Charles Ferdinand Dowd (1825-1904), 47# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 48# His pamphlet "A System of National Time for Railroads" (1870) 49# was the result of his proposals at the Convention of Railroad Trunk Lines 50# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 51# but in 1872-05 he moved the proposed origin to Greenwich. 52 53# From Paul Eggert (2018-03-20): 54# Dowd's proposal left many details unresolved, such as where to draw 55# lines between time zones. The key individual who made time zones 56# work in the US was William Frederick Allen - railway engineer, 57# managing editor of the Travelers' Guide, and secretary of the 58# General Time Convention, a railway standardization group. Allen 59# spent months in dialogs with scientific and railway leaders, 60# developed a workable plan to institute time zones, and presented it 61# to the General Time Convention on 1883-04-11, saying that his plan 62# meant "local time would be practically abolished" - a plus for 63# railway scheduling. By the next convention on 1883-10-11 nearly all 64# railroads had agreed and it took effect on 1883-11-18. That Sunday 65# was called the "day of two noons", as some locations observed noon 66# twice. Allen witnessed the transition in New York City, writing: 67# 68# I heard the bells of St. Paul's strike on the old time. Four 69# minutes later, obedient to the electrical signal from the Naval 70# Observatory ... the time-ball made its rapid descent, the chimes 71# of old Trinity rang twelve measured strokes, and local time was 72# abandoned, probably forever. 73# 74# Most of the US soon followed suit. See: 75# Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56. 76# https://dx.doi.org/10.2307/3105430 77 78# From Paul Eggert (2005-04-16): 79# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 80# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 81 82# From Paul Eggert (2006-03-22): 83# A good source for time zone historical data in the US is 84# Thomas G. Shanks, The American Atlas (5th edition), 85# San Diego: ACS Publications, Inc. (1991). 86# Make sure you have the errata sheet; the book is somewhat useless without it. 87# It is the source for most of the pre-1991 US entries below. 88 89# From Paul Eggert (2001-03-06): 90# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 91# in his whimsical essay "An Economical Project for Diminishing the Cost 92# of Light" published in the Journal de Paris (1784-04-26). 93# Not everyone is happy with the results: 94# 95# I don't really care how time is reckoned so long as there is some 96# agreement about it, but I object to being told that I am saving 97# daylight when my reason tells me that I am doing nothing of the kind. 98# I even object to the implication that I am wasting something 99# valuable if I stay in bed after the sun has risen. As an admirer 100# of moonlight I resent the bossy insistence of those who want to 101# reduce my time for enjoying it. At the back of the Daylight Saving 102# scheme I detect the bony, blue-fingered hand of Puritanism, eager 103# to push people into bed earlier, and get them up earlier, to make 104# them healthy, wealthy and wise in spite of themselves. 105# 106# -- Robertson Davies, The diary of Samuel Marchbanks, 107# Clarke, Irwin (1947), XIX, Sunday 108# 109# For more about the first ten years of DST in the United States, see 110# Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint 111# (Carnegie Library of Pittsburgh, 1927). 112# https://web.archive.org/web/20160517155308/http://www.clpgh.org/exhibit/dst.html 113# 114# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 115# However, DST was imposed by the Standard Time Act of 1918, which 116# was the first nationwide legal time standard, and apparently 117# time was just called "Standard Time" or "Daylight Saving Time". 118 119# From Paul Eggert (2019-06-04): 120# Here is the legal basis for the US federal rules. 121# * Public Law 65-106 (1918-03-19) implemented standard and daylight saving 122# time for the first time across the US, springing forward on March's last 123# Sunday and falling back on October's last Sunday. 124# https://www.loc.gov/law/help/statutes-at-large/65th-congress/session-2/c65s2ch24.pdf 125# * Public Law 66-40 (1919-08-20) repealed DST on October 1919's last Sunday. 126# https://www.loc.gov/law/help/statutes-at-large/66th-congress/session-1/c66s1ch51.pdf 127# * Public Law 77-403 (1942-01-20) started wartime DST on 1942-02-09. 128# https://www.loc.gov/law/help/statutes-at-large/77th-congress/session-2/c77s2ch7.pdf 129# * Public Law 79-187 (1945-09-25) ended wartime DST on 1945-09-30. 130# https://www.loc.gov/law/help/statutes-at-large/79th-congress/session-1/c79s1ch388.pdf 131# * Public Law 89-387 (1966-04-13) reinstituted a national standard for DST, 132# from April's last Sunday to October's last Sunday, effective 1967. 133# https://www.govinfo.gov/content/pkg/STATUTE-80/pdf/STATUTE-80-Pg107.pdf 134# * Public Law 93-182 (1973-12-15) moved the 1974 spring-forward to 01-06. 135# https://www.govinfo.gov/content/pkg/STATUTE-87/pdf/STATUTE-87-Pg707.pdf 136# * Public Law 93-434 (1974-10-05) moved the 1975 spring-forward to 137# February's last Sunday. 138# https://www.govinfo.gov/content/pkg/STATUTE-88/pdf/STATUTE-88-Pg1209.pdf 139# * Public Law 99-359 (1986-07-08) moved the spring-forward to April's first 140# Sunday. 141# https://www.govinfo.gov/content/pkg/STATUTE-100/pdf/STATUTE-100-Pg764.pdf 142# * Public Law 109-58 (2005-08-08), effective 2007, moved the spring-forward 143# to March's second Sunday and the fall-back to November's first Sunday. 144# https://www.govinfo.gov/content/pkg/PLAW-109publ58/pdf/PLAW-109publ58.pdf 145# All transitions are at 02:00 local time. 146 147# From Arthur David Olson: 148# Before the Uniform Time Act of 1966 took effect in 1967, observance of 149# Daylight Saving Time in the US was by local option, except during wartime. 150 151# From Arthur David Olson (2000-09-25): 152# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 153# In the introduction, Oboler spoke of "Eastern Peace Time." 154# An AltaVista search turned up: 155# https://web.archive.org/web/20000926032210/http://rowayton.org/rhs/hstaug45.html 156# "When the time is announced over the radio now, it is 'Eastern Peace 157# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 158# (August 1945) by way of confirmation. 159# 160# From Paul Eggert (2017-09-23): 161# This was the V-J Day issue of the Clamdigger, a Rowayton, CT newsletter. 162 163# From Joseph Gallant citing 164# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 165# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 166# to switch to London for Attlee's address, but the American people 167# never got to hear his speech live. According to one press account, 168# CBS' Bob Trout was first to announce the word of Japan's surrender, 169# but a few seconds later, NBC, ABC and Mutual also flashed the word 170# of surrender, all of whom interrupting the bells of Big Ben in 171# London which were to precede Mr. Attlee's speech. 172 173# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 174# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 175# 176# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 177# Any announcement from Asia would reach St. John's New York newsroom on a 178# wire service teletype machine, which had prescribed signals for major news. 179# Associated Press, for example, would ring five bells before spewing out 180# typed copy of an important story, and 10 bells for news "of transcendental 181# importance." 182# 183# On Aug. 14, stalling while talking steadily into the NBC networks' open 184# microphone, St. John heard five bells and waited only to hear a sixth bell, 185# before announcing confidently: "Ladies and gentlemen, World War II is over. 186# The Japanese have agreed to our surrender terms." 187# 188# He had scored a 20-second scoop on other broadcasters. 189 190# From Arthur David Olson (2005-08-22): 191# Paul has been careful to use the "US" rules only in those locations 192# that are part of the United States; this reflects the real scope of 193# U.S. government action. So even though the "US" rules have changed 194# in the latest release, other countries won't be affected. 195 196# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 197Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 198Rule US 1918 1919 - Oct lastSun 2:00 0 S 199Rule US 1942 only - Feb 9 2:00 1:00 W # War 200Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 201Rule US 1945 only - Sep 30 2:00 0 S 202Rule US 1967 2006 - Oct lastSun 2:00 0 S 203Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 204Rule US 1974 only - Jan 6 2:00 1:00 D 205Rule US 1975 only - Feb lastSun 2:00 1:00 D 206Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 207Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 208Rule US 2007 max - Mar Sun>=8 2:00 1:00 D 209Rule US 2007 max - Nov Sun>=1 2:00 0 S 210 211# From Arthur David Olson, 2005-12-19 212# We generate the files specified below to guard against old files with 213# obsolete information being left in the time zone binary directory. 214# We limit the list to names that have appeared in previous versions of 215# this time zone package. 216# We do these as separate Zones rather than as Links to avoid problems if 217# a particular place changes whether it observes DST. 218# We put these specifications here in the northamerica file both to 219# increase the chances that they'll actually get compiled and to 220# avoid the need to duplicate the US rules in another file. 221 222# Zone NAME STDOFF RULES FORMAT [UNTIL] 223Zone EST -5:00 - EST 224Zone MST -7:00 - MST 225Zone HST -10:00 - HST 226Zone EST5EDT -5:00 US E%sT 227Zone CST6CDT -6:00 US C%sT 228Zone MST7MDT -7:00 US M%sT 229Zone PST8PDT -8:00 US P%sT 230 231# From U. S. Naval Observatory (1989-01-19): 232# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 233# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 234# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 235# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 236# USA MOUNTAIN 7 H BEHIND UTC DENVER 237# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 238# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 239# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 240# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 241# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 242# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 243# USA " 9 H BEHIND UTC APR 3 - OCT 30 244# USA HAWAII 10 H BEHIND UTC 245# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 246 247# From Arthur David Olson (1989-01-21): 248# The above dates are for 1988. 249# Note the "AKST" and "AKDT" abbreviations, the claim that there's 250# no DST in Samoa, and the claim that there is DST in Alaska and the 251# Aleutians. 252 253# From Arthur David Olson (1988-02-13): 254# Legal standard time zone names, from United States Code (1982 Edition and 255# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 256# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 257# took effect), as explained in sections 263 and 261: 258# (none) 259# United States standard eastern time 260# United States standard mountain time 261# United States standard central time 262# United States standard Pacific time 263# (none) 264# United States standard Alaska time 265# (none) 266# Next, names from 1967-04-01 until 1983-11-30 (the date for 267# public law 98-181): 268# Atlantic standard time 269# eastern standard time 270# central standard time 271# mountain standard time 272# Pacific standard time 273# Yukon standard time 274# Alaska-Hawaii standard time 275# Bering standard time 276# And after 1983-11-30: 277# Atlantic standard time 278# eastern standard time 279# central standard time 280# mountain standard time 281# Pacific standard time 282# Alaska standard time 283# Hawaii-Aleutian standard time 284# Samoa standard time 285# The law doesn't give abbreviations. 286# 287# From Paul Eggert (2016-12-19): 288# Here are URLs for the 1918 and 1966 legislation: 289# http://uscode.house.gov/statviewer.htm?volume=40&page=451 290# http://uscode.house.gov/statviewer.htm?volume=80&page=108 291# Although the 1918 names were officially "United States Standard 292# Eastern Time" and similarly for "Central", "Mountain", "Pacific", 293# and "Alaska", in practice "Standard" was placed just before "Time", 294# as codified in 1966. In practice, Alaska time was abbreviated "AST" 295# before 1968. Summarizing the 1967 name changes: 296# 1918 names 1967 names 297# -08 Standard Pacific Time (PST) Pacific standard time (PST) 298# -09 (unofficial) Yukon (YST) Yukon standard time (YST) 299# -10 Standard Alaska Time (AST) Alaska-Hawaii standard time (AHST) 300# -11 (unofficial) Nome (NST) Bering standard time (BST) 301# 302# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 303# Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time" 304# for time in Guam and the Northern Marianas. See the file "australasia". 305# 306# From Paul Eggert (2015-04-17): 307# HST and HDT are standardized abbreviations for Hawaii-Aleutian 308# standard and daylight times. See section 9.47 (p 234) of the 309# U.S. Government Printing Office Style Manual (2008) 310# https://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf 311 312# From Arthur David Olson, 2005-08-09 313# The following was signed into law on 2005-08-08. 314# 315# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 316# (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15 317# U.S.C. 260a(a)) is amended-- 318# (1) by striking "first Sunday of April" and inserting "second 319# Sunday of March"; and 320# (2) by striking "last Sunday of October" and inserting "first 321# Sunday of November'. 322# (b) Effective Date.--Subsection (a) shall take effect 1 year after the 323# date of enactment of this Act or March 1, 2007, whichever is later. 324# (c) Report to Congress.--Not later than 9 months after the effective 325# date stated in subsection (b), the Secretary shall report to Congress 326# on the impact of this section on energy consumption in the United 327# States. 328# (d) Right to Revert.--Congress retains the right to revert the 329# Daylight Saving Time back to the 2005 time schedules once the 330# Department study is complete. 331 332# US eastern time, represented by New York 333 334# Connecticut, Delaware, District of Columbia, most of Florida, 335# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky 336# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, 337# New Hampshire, New Jersey, New York, North Carolina, Ohio, 338# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 339# Vermont, Virginia, West Virginia 340 341# From Dave Cantor (2004-11-02): 342# Early this summer I had the occasion to visit the Mount Washington 343# Observatory weather station atop (of course!) Mount Washington [, NH].... 344# One of the staff members said that the station was on Eastern Standard Time 345# and didn't change their clocks for Daylight Saving ... so that their 346# reports will always have times which are 5 hours behind UTC. 347 348# From Paul Eggert (2005-08-26): 349# According to today's Huntsville Times 350# http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1 351# a few towns on Alabama's "eastern border with Georgia, such as Phenix City 352# in Russell County, Lanett in Chambers County and some towns in Lee County, 353# set their watches and clocks on Eastern time." It quotes H.H. "Bubba" 354# Roberts, city administrator in Phenix City. as saying "We are in the Central 355# time zone, but we do go by the Eastern time zone because so many people work 356# in Columbus." 357# 358# From Paul Eggert (2017-02-22): 359# Four cities are involved. The two not mentioned above are Smiths Station 360# and Valley. Barbara Brooks, Valley's assistant treasurer, heard it started 361# because West Point Pepperell textile mills were in Alabama while the 362# corporate office was in Georgia, and residents voted to keep Eastern 363# time even after the mills closed. See: Kazek K. Did you know which 364# Alabama towns are in a different time zone? al.com 2017-02-06. 365# http://www.al.com/living/index.ssf/2017/02/do_you_know_which_alabama_town.html 366 367# From Paul Eggert (2014-09-06): 368# Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208 369# says that New York City Hall time was 3 minutes 58.4 seconds fast of 370# Eastern time (i.e., -4:56:01.6) just before the 1883 switch. Round to the 371# nearest second. 372 373# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 374Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 375Rule NYC 1920 only - Oct lastSun 2:00 0 S 376Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 377Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 378Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 379# Zone NAME STDOFF RULES FORMAT [UNTIL] 380Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 381 -5:00 US E%sT 1920 382 -5:00 NYC E%sT 1942 383 -5:00 US E%sT 1946 384 -5:00 NYC E%sT 1967 385 -5:00 US E%sT 386 387# US central time, represented by Chicago 388 389# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 390# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 391# Washington counties), Illinois, western Indiana 392# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 393# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 394# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 395# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 396# western Tennessee, most of Texas, Wisconsin 397 398# From Paul Eggert (2018-01-07): 399# In 1869 the Chicago Astronomical Society contracted with the city to keep 400# time. Though delayed by the Great Fire, by 1880 a wire ran from the 401# Dearborn Observatory (on the University of Chicago campus) to City Hall, 402# which then sent signals to police and fire stations. However, railroads got 403# their time signals from the Allegheny Observatory, the Madison Observatory, 404# the Ann Arbor Observatory, etc., so their clocks did not agree with each 405# other or with the city's official time. The confusion took some years to 406# clear up. See: 407# Moser M. How Chicago gave America its time zones. Chicago. 2018-01-04. 408# http://www.chicagomag.com/city-life/January-2018/How-Chicago-Gave-America-Its-Time-Zones/ 409 410# From Larry M. Smith (2006-04-26) re Wisconsin: 411# https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf 412# is currently enforced at the 01:00 time of change. Because the local 413# "bar time" in the state corresponds to 02:00, a number of citations 414# are issued for the "sale of class 'B' alcohol after prohibited 415# hours" within the deviated hour of this change every year.... 416# 417# From Douglas R. Bomberg (2007-03-12): 418# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI 419# Statue 175 closer in synch with the US Congress' intent.... 420# https://docs.legis.wisconsin.gov/2007/related/acts/3 421 422# From an email administrator of the City of Fort Pierre, SD (2015-12-21): 423# Fort Pierre is technically located in the Mountain time zone as is 424# the rest of Stanley County. Most of Stanley County and Fort Pierre 425# uses the Central time zone due to doing most of their business in 426# Pierre so it simplifies schedules. I have lived in Stanley County 427# all my life and it has been that way since I can remember. (43 years!) 428# 429# From Paul Eggert (2015-12-25): 430# Assume this practice predates 1970, so Fort Pierre can use America/Chicago. 431 432# From Paul Eggert (2015-04-06): 433# In 1950s Nashville a public clock had dueling faces, one for conservatives 434# and the other for liberals; the two sides didn't agree about the time of day. 435# I haven't found a photo of this clock, nor have I tracked down the TIME 436# magazine report cited below, but here's the story as told by the late 437# American journalist John Seigenthaler, who was there: 438# 439# "The two [newspaper] owners held strongly contrasting political and 440# ideological views. Evans was a New South liberal, Stahlman an Old South 441# conservative, and their two papers frequently clashed editorially, often on 442# the same day.... In the 1950s as the state legislature was grappling with 443# the question of whether to approve daylight saving time for the entire state, 444# TIME magazine reported: 445# 446# "'The Nashville Banner and The Nashville Tennessean rarely agree on anything 447# but the time of day - and last week they couldn't agree on that.' 448# 449# "It was all too true. The clock on the front of the building had two faces - 450# The Tennessean side of the building facing west, the other, east. When it 451# was high noon Banner time, it was 11 a.m. Tennessean time." 452# 453# Seigenthaler J. For 100 years, Tennessean had it covered. 454# The Tennessean 2007-05-11, republished 2015-04-06. 455# https://www.tennessean.com/story/insider/extras/2015/04/06/archives-seigenthaler-for-100-years-the-tennessean-had-it-covered/25348545/ 456 457# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 458Rule Chicago 1920 only - Jun 13 2:00 1:00 D 459Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 460Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 461Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 462Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 463Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 464# Zone NAME STDOFF RULES FORMAT [UNTIL] 465Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 466 -6:00 US C%sT 1920 467 -6:00 Chicago C%sT 1936 Mar 1 2:00 468 -5:00 - EST 1936 Nov 15 2:00 469 -6:00 Chicago C%sT 1942 470 -6:00 US C%sT 1946 471 -6:00 Chicago C%sT 1967 472 -6:00 US C%sT 473# Oliver County, ND switched from mountain to central time on 1992-10-25. 474Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 475 -7:00 US M%sT 1992 Oct 25 2:00 476 -6:00 US C%sT 477# Morton County, ND, switched from mountain to central time on 478# 2003-10-26, except for the area around Mandan which was already central time. 479# See <http://dmses.dot.gov/docimages/p63/135818.pdf>. 480# Officially this switch also included part of Sioux County, and 481# Jones, Mellette, and Todd Counties in South Dakota; 482# but in practice these other counties were already observing central time. 483# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>. 484Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21 485 -7:00 US M%sT 2003 Oct 26 2:00 486 -6:00 US C%sT 487 488# From Josh Findley (2011-01-21): 489# ...it appears that Mercer County, North Dakota, changed from the 490# mountain time zone to the central time zone at the last transition from 491# daylight-saving to standard time (on Nov. 7, 2010): 492# https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm 493# http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html 494 495# From Andy Lipscomb (2011-01-24): 496# ...according to the Census Bureau, the largest city is Beulah (although 497# it's commonly referred to as Beulah-Hazen, with Hazen being the next 498# largest city in Mercer County). Google Maps places Beulah's city hall 499# at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07". 500 501Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53 502 -7:00 US M%sT 2010 Nov 7 2:00 503 -6:00 US C%sT 504 505# US mountain time, represented by Denver 506# 507# Colorado, far western Kansas, Montana, western 508# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 509# New Mexico, southwestern North Dakota, 510# western South Dakota, far western Texas (El Paso County, Hudspeth County, 511# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 512# 513# From Paul Eggert (2018-10-25): 514# On 1921-03-04 federal law placed all of Texas into the central time zone. 515# However, El Paso ignored the law for decades and continued to observe 516# mountain time, on the grounds that that's what they had always done 517# and they weren't about to let the federal government tell them what to do. 518# Eventually the federal government gave in and changed the law on 519# 1970-04-10 to match what El Paso was actually doing. Although 520# that's slightly after our 1970 cutoff, there is no need to create a 521# separate zone for El Paso since they were ignoring the law anyway. See: 522# Long T. El Pasoans were time rebels, fought to stay in Mountain zone. 523# El Paso Times. 2018-10-24 06:40 -06. 524# https://www.elpasotimes.com/story/news/local/el-paso/2018/10/24/el-pasoans-were-time-rebels-fought-stay-mountain-zone/1744509002/ 525# 526# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 527Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 528Rule Denver 1920 only - Oct lastSun 2:00 0 S 529Rule Denver 1921 only - May 22 2:00 0 S 530Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 531Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 532# Zone NAME STDOFF RULES FORMAT [UNTIL] 533Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 534 -7:00 US M%sT 1920 535 -7:00 Denver M%sT 1942 536 -7:00 US M%sT 1946 537 -7:00 Denver M%sT 1967 538 -7:00 US M%sT 539 540# US Pacific time, represented by Los Angeles 541# 542# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 543# Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county 544# north of the Salmon River, and the towns of Burgdorf and Warren), 545# Nevada (except West Wendover), Oregon (except the northern ¾ of 546# Malheur county), and Washington 547 548# From Paul Eggert (2016-08-20): 549# In early February 1948, in response to California's electricity shortage, 550# PG&E changed power frequency from 60 to 59.5 Hz during daylight hours, 551# causing electric clocks to lose six minutes per day. (This did not change 552# legal time, and is not part of the data here.) See: 553# Ross SA. An energy crisis from the past: Northern California in 1948. 554# Working Paper No. 8, Institute of Governmental Studies, UC Berkeley, 555# 1973-11. https://escholarship.org/uc/item/8x22k30c 556# 557# In another measure to save electricity, DST was instituted from 1948-03-14 558# at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move 559# the fallback transition earlier. See pages 3-4 of: 560# http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf 561# 562# In response: 563# 564# Governor Warren received a torrent of objecting mail, and it is not too much 565# to speculate that the objections to Daylight Saving Time were one important 566# factor in the defeat of the Dewey-Warren Presidential ticket in California. 567# -- Ross, p 25 568# 569# On December 8 the governor exercised the option, setting the date to January 1 570# (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01). 571# 572# Despite the controversy, in 1949 California voters approved Proposition 12, 573# which established DST from April's last Sunday at 01:00 until September's 574# last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed 575# the fall-back date to October's last Sunday. See: 576# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props 577# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props 578# 579# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 580Rule CA 1948 only - Mar 14 2:01 1:00 D 581Rule CA 1949 only - Jan 1 2:00 0 S 582Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D 583Rule CA 1950 1961 - Sep lastSun 2:00 0 S 584Rule CA 1962 1966 - Oct lastSun 2:00 0 S 585# Zone NAME STDOFF RULES FORMAT [UNTIL] 586Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 587 -8:00 US P%sT 1946 588 -8:00 CA P%sT 1967 589 -8:00 US P%sT 590 591# Alaska 592# AK%sT is the modern abbreviation for -09 per USNO. 593# 594# From Paul Eggert (2017-06-15): 595# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 596# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 597# On Friday, 1867-10-18 (Gregorian), at precisely 15:30 local time, the 598# Russian forts and fleet at Sitka fired salutes to mark the ceremony of 599# formal transfer. See the Sacramento Daily Union (1867-11-14), p 3, col 2. 600# https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SDU18671114.2.12.1 601# Sitka workers did not change their calendars until Sunday, 1867-10-20, 602# and so celebrated two Sundays that week. See: Ahllund T (tr Hallamaa P). 603# From the memoirs of a Finnish workman. Alaska History. 2006 Fall;21(2):1-25. 604# http://alaskahistoricalsociety.org/wp-content/uploads/2016/12/Ahllund-2006-Memoirs-of-a-Finnish-Workman.pdf 605# Include only the time zone part of this transition, ignoring the switch 606# from Julian to Gregorian, since we can't represent the Julian calendar. 607# 608# As far as we know, of the locations mentioned below only Sitka was 609# permanently inhabited in 1867 by anyone using either calendar. 610# (Yakutat was colonized by the Russians in 1799, but the settlement was 611# destroyed in 1805 by a Yakutat-kon war party.) Many of Alaska's inhabitants 612# were unaware of the US acquisition of Alaska, much less of any calendar or 613# time change. However, the Russian-influenced part of Alaska did observe 614# Russian time, and it is more accurate to model this than to ignore it. 615# The database format requires an exact transition time; use the Russian 616# salute as a somewhat-arbitrary time for the formal transfer of control for 617# all of Alaska. Sitka's UTC offset is -9:01:13; adjust its 15:30 to the 618# local times of other Alaskan locations so that they change simultaneously. 619 620# From Paul Eggert (2014-07-18): 621# One opinion of the early-1980s turmoil in Alaska over time zones and 622# daylight saving time appeared as graffiti on a Juneau airport wall: 623# "Welcome to Juneau. Please turn your watch back to the 19th century." 624# See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01. 625# http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html 626# 627# Steve Ferguson (2011-01-31) referred to the following source: 628# Norris F. Keeping time in Alaska: national directives, local response. 629# Alaska History 2001;16(1-2). 630# http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/ 631 632# From Arthur David Olson (2011-02-01): 633# Here's database-relevant material from the 2001 "Alaska History" article: 634# 635# On September 20 [1979]...DOT...officials decreed that on April 27, 636# 1980, Juneau and other nearby communities would move to Yukon Time. 637# Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on 638# Pacific Time. 639# 640# ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the 641# Department's September 1979 decision. Juneau and other communities in 642# northern Southeast reverted to Pacific Time on October 26. 643# 644# On October 28 [1983]...the Metlakatla Indian Community Council voted 645# unanimously to keep the reservation on Pacific Time. 646# 647# According to DOT official Joanne Petrie, Indian reservations are not 648# bound to follow time zones imposed by neighboring jurisdictions. 649# 650# (The last is consistent with how the database now handles the Navajo 651# Nation.) 652 653# From Arthur David Olson (2011-02-09): 654# I just spoke by phone with a staff member at the Metlakatla Indian 655# Community office (using contact information available at 656# http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla 657# It's shortly after 1:00 here on the east coast of the United States; 658# the staffer said it was shortly after 10:00 there. When I asked whether 659# that meant they were on Pacific time, they said no - they were on their 660# own time. I asked about daylight saving; they said it wasn't used. I 661# did not inquire about practices in the past. 662 663# From Arthur David Olson (2011-08-17): 664# For lack of better information, assume that Metlakatla's 665# abandonment of use of daylight saving resulted from the 1983 vote. 666 667# From Steffen Thorsen (2015-11-09): 668# It seems Metlakatla did go off PST on Sunday, November 1, changing 669# their time to AKST and are going to follow Alaska's DST, switching 670# between AKST and AKDT from now on.... 671# https://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/ 672 673# From Ryan Stanley (2018-11-06): 674# The Metlakatla community in Alaska has decided not to change its 675# clock back an hour starting on November 4th, 2018 (day before yesterday). 676# They will be gmtoff=-28800 year-round. 677# https://www.facebook.com/141055983004923/photos/pb.141055983004923.-2207520000.1541465673./569081370202380/ 678 679# From Paul Eggert (2018-12-16): 680# In a 2018-12-11 special election, Metlakatla voted to go back to 681# Alaska time (including daylight saving time) starting next year. 682# https://www.krbd.org/2018/12/12/metlakatla-to-follow-alaska-standard-time-allow-liquor-sales/ 683# 684# From Ryan Stanley (2019-01-11): 685# The community will be changing back on the 20th of this month... 686# From Tim Parenti (2019-01-11): 687# Per an announcement on the Metlakatla community's official Facebook page, the 688# "fall back" will be on Sunday 2019-01-20 at 02:00: 689# https://www.facebook.com/141055983004923/photos/607150969728753/ 690# So they won't be waiting for Alaska to join them on 2019-03-10, but will 691# rather change their clocks twice in seven weeks. 692 693# Zone NAME STDOFF RULES FORMAT [UNTIL] 694Zone America/Juneau 15:02:19 - LMT 1867 Oct 19 15:33:32 695 -8:57:41 - LMT 1900 Aug 20 12:00 696 -8:00 - PST 1942 697 -8:00 US P%sT 1946 698 -8:00 - PST 1969 699 -8:00 US P%sT 1980 Apr 27 2:00 700 -9:00 US Y%sT 1980 Oct 26 2:00 701 -8:00 US P%sT 1983 Oct 30 2:00 702 -9:00 US Y%sT 1983 Nov 30 703 -9:00 US AK%sT 704Zone America/Sitka 14:58:47 - LMT 1867 Oct 19 15:30 705 -9:01:13 - LMT 1900 Aug 20 12:00 706 -8:00 - PST 1942 707 -8:00 US P%sT 1946 708 -8:00 - PST 1969 709 -8:00 US P%sT 1983 Oct 30 2:00 710 -9:00 US Y%sT 1983 Nov 30 711 -9:00 US AK%sT 712Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 19 15:44:55 713 -8:46:18 - LMT 1900 Aug 20 12:00 714 -8:00 - PST 1942 715 -8:00 US P%sT 1946 716 -8:00 - PST 1969 717 -8:00 US P%sT 1983 Oct 30 2:00 718 -8:00 - PST 2015 Nov 1 2:00 719 -9:00 US AK%sT 2018 Nov 4 2:00 720 -8:00 - PST 2019 Jan 20 2:00 721 -9:00 US AK%sT 722Zone America/Yakutat 14:41:05 - LMT 1867 Oct 19 15:12:18 723 -9:18:55 - LMT 1900 Aug 20 12:00 724 -9:00 - YST 1942 725 -9:00 US Y%sT 1946 726 -9:00 - YST 1969 727 -9:00 US Y%sT 1983 Nov 30 728 -9:00 US AK%sT 729Zone America/Anchorage 14:00:24 - LMT 1867 Oct 19 14:31:37 730 -9:59:36 - LMT 1900 Aug 20 12:00 731 -10:00 - AST 1942 732 -10:00 US A%sT 1967 Apr 733 -10:00 - AHST 1969 734 -10:00 US AH%sT 1983 Oct 30 2:00 735 -9:00 US Y%sT 1983 Nov 30 736 -9:00 US AK%sT 737Zone America/Nome 12:58:22 - LMT 1867 Oct 19 13:29:35 738 -11:01:38 - LMT 1900 Aug 20 12:00 739 -11:00 - NST 1942 740 -11:00 US N%sT 1946 741 -11:00 - NST 1967 Apr 742 -11:00 - BST 1969 743 -11:00 US B%sT 1983 Oct 30 2:00 744 -9:00 US Y%sT 1983 Nov 30 745 -9:00 US AK%sT 746Zone America/Adak 12:13:22 - LMT 1867 Oct 19 12:44:35 747 -11:46:38 - LMT 1900 Aug 20 12:00 748 -11:00 - NST 1942 749 -11:00 US N%sT 1946 750 -11:00 - NST 1967 Apr 751 -11:00 - BST 1969 752 -11:00 US B%sT 1983 Oct 30 2:00 753 -10:00 US AH%sT 1983 Nov 30 754 -10:00 US H%sT 755# The following switches don't quite make our 1970 cutoff. 756# 757# Shanks writes that part of southwest Alaska (e.g. Aniak) 758# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 759# and another part (e.g. Akiak) made the same switch five weeks later. 760# 761# From David Flater (2004-11-09): 762# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 763# Historic Preservation Commission, provided this information, which 764# suggests that Unalaska deviated from statutory time from early 1967 765# possibly until 1983: 766# 767# Minutes of the Unalaska City Council Meeting, January 10, 1967: 768# "Except for St. Paul and Akutan, Unalaska is the only important 769# location not on Alaska Standard Time. The following resolution was 770# made by William Robinson and seconded by Henry Swanson: Be it 771# resolved that the City of Unalaska hereby goes to Alaska Standard 772# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 773# January 14, Alaska Standard Time.) This resolution was passed with 774# three votes for and one against." 775 776# Hawaii 777 778# From Arthur David Olson (2010-12-09): 779# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225 780# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09, 781# the article is available at 782# https://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf 783# and indicates that standard time was adopted effective noon, January 784# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight 785# saving for the period between the last Sunday of each April and the 786# last Sunday of each September, but less than a month later repealed the 787# act," (page 220), that year-round daylight saving time was in effect 788# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for 789# when clocks changed) and that clocks were changed by 30 minutes 790# effective the second Sunday of June, 1947 (page 219, with no time of 791# day given for when clocks changed). A footnote for the 1933 changes 792# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933) 793# and Act 163 (approved 21 May 1933)." 794 795# From Arthur David Olson (2011-01-19): 796# The following is from "Laws of the Territory of Hawaii Passed by the 797# Seventeenth Legislature: Regular Session 1933," available (as of 798# 2011-01-19) at American University's Pence Law Library. Page 85: "Act 799# 90...At 2 o'clock ante meridian of the last Sunday in April of each 800# year, the standard time of this Territory shall be advanced one 801# hour...This Act shall take effect upon its approval. Approved this 26th 802# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of 803# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is 804# hereby repealed...This Act shall take effect upon its approval, upon 805# which date the standard time of this Territory shall be restored to 806# that existing immediately prior to the taking effect of said Act 90. 807# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor 808# of the Territory of Hawaii." 809# 810# Note that 1933-05-21 was a Sunday. 811# We're left to guess the time of day when Act 163 was approved; guess noon. 812 813# Zone NAME STDOFF RULES FORMAT [UNTIL] 814Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 815 -10:30 - HST 1933 Apr 30 2:00 816 -10:30 1:00 HDT 1933 May 21 12:00 817 -10:30 US H%sT 1947 Jun 8 2:00 818 -10:00 - HST 819 820# Now we turn to US areas that have diverged from the consensus since 1970. 821 822# Arizona mostly uses MST. 823 824# From Paul Eggert (2002-10-20): 825# 826# The information in the rest of this paragraph is derived from the 827# Daylight Saving Time web page 828# <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23) 829# maintained by the Arizona State Library, Archives and Public Records. 830# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 831# time, but by federal law railroads, airlines, bus lines, military 832# personnel, and some engaged in interstate commerce continued to 833# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 834# Gazette says that was the date the law changed, and that 04-01 was 835# the date the state's clocks would change. In 1945 the State of 836# Arizona used standard time all year, again with exceptions only as 837# mandated by federal law. Arizona observed DST in 1967, but Arizona 838# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 839# 840# Shanks says the 1944 experiment came to an end on 1944-03-17. 841# Go with the Arizona State Library instead. 842 843# Zone NAME STDOFF RULES FORMAT [UNTIL] 844Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 845 -7:00 US M%sT 1944 Jan 1 0:01 846 -7:00 - MST 1944 Apr 1 0:01 847 -7:00 US M%sT 1944 Oct 1 0:01 848 -7:00 - MST 1967 849 -7:00 US M%sT 1968 Mar 21 850 -7:00 - MST 851# From Arthur David Olson (1988-02-13): 852# A writer from the Inter Tribal Council of Arizona, Inc., 853# notes in private correspondence dated 1987-12-28 that "Presently, only the 854# Navajo Nation participates in the Daylight Saving Time policy, due to its 855# large size and location in three states." (The "only" means that other 856# tribal nations don't use DST.) 857# 858# From Paul Eggert (2013-08-26): 859# See America/Denver for a zone appropriate for the Navajo Nation. 860 861# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 862# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 863# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 864# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 865# Teton, Twin Falls, Valley, Washington counties, and the southern 866# quarter of Idaho county) and eastern Oregon (most of Malheur County) 867# switched four weeks late in 1974. 868# 869# Zone NAME STDOFF RULES FORMAT [UNTIL] 870Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 871 -8:00 US P%sT 1923 May 13 2:00 872 -7:00 US M%sT 1974 873 -7:00 - MST 1974 Feb 3 2:00 874 -7:00 US M%sT 875 876# Indiana 877# 878# For a map of Indiana's time zone regions, see: 879# https://en.wikipedia.org/wiki/Time_in_Indiana 880# 881# From Paul Eggert (2018-11-30): 882# A brief but entertaining history of time in Indiana describes a 1949 debate 883# in the Indiana House where city legislators (who favored "fast time") 884# tussled with farm legislators (who didn't) over a bill to outlaw DST: 885# "Lacking enough votes, the city faction tries to filibuster until time runs 886# out on the session at midnight, but rural champion Rep. Herbert Copeland, 887# R-Madison, leans over the gallery railing and forces the official clock 888# back to 9 p.m., breaking it in the process. The clock sticks on 9 as the 889# debate rages on into the night. The filibuster finally dies out and the 890# bill passes, while outside the chamber, clocks read 3:30 a.m. In the end, 891# it doesn't matter which side won. The law has no enforcement powers and 892# is simply ignored by fast-time communities." 893# How Indiana went from 'God's time' to split zones and daylight-saving. 894# Indianapolis Star. 2018-11-27 14:58 -05. 895# https://www.indystar.com/story/news/politics/2018/11/27/indianapolis-indiana-time-zone-history-central-eastern-daylight-savings-time/2126300002/ 896# 897# From Paul Eggert (2007-08-17): 898# Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 899# with the following exceptions: 900# 901# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 902# Vanderburgh, and Warrick counties have been like America/Chicago. 903# 904# - Dearborn and Ohio counties have been like America/New_York. 905# 906# - Clark, Floyd, and Harrison counties have been like 907# America/Kentucky/Louisville. 908# 909# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke, 910# and Switzerland counties have their own time zone histories as noted below. 911# 912# Shanks partitioned Indiana into 345 regions, each with its own time history, 913# and wrote "Even newspaper reports present contradictory information." 914# Those Hoosiers! Such a flighty and changeable people! 915# Fortunately, most of the complexity occurred before our cutoff date of 1970. 916# 917# Other than Indianapolis, the Indiana place names are so nondescript 918# that they would be ambiguous if we left them at the 'America' level. 919# So we reluctantly put them all in a subdirectory 'America/Indiana'. 920 921# From Paul Eggert (2014-06-26): 922# https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana 923# says "DOT is relocating the time zone boundary in Indiana to move Starke, 924# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the 925# Eastern Time Zone to the Central Time Zone.... The effective date of 926# this rule is 2 a.m. EST Sunday, April 2, 2006, which is the 927# changeover date from standard time to Daylight Saving Time." 928# Strictly speaking, this meant the affected counties changed their 929# clocks twice that night, but this obviously was in error. The intent 930# was that 01:59:59 EST be followed by 02:00:00 CDT. 931 932# From Gwillim Law (2007-02-10): 933# The Associated Press has been reporting that Pulaski County, Indiana is 934# going to switch from Central to Eastern Time on March 11, 2007.... 935# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL 936 937# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 938Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 939Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 940Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 941# Zone NAME STDOFF RULES FORMAT [UNTIL] 942Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 943 -6:00 US C%sT 1920 944 -6:00 Indianapolis C%sT 1942 945 -6:00 US C%sT 1946 946 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 947 -5:00 - EST 1957 Sep 29 2:00 948 -6:00 - CST 1958 Apr 27 2:00 949 -5:00 - EST 1969 950 -5:00 US E%sT 1971 951 -5:00 - EST 2006 952 -5:00 US E%sT 953# 954# Eastern Crawford County, Indiana, left its clocks alone in 1974, 955# as well as from 1976 through 2005. 956# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 957Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 958Rule Marengo 1951 only - Sep lastSun 2:00 0 S 959Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 960Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 961# Zone NAME STDOFF RULES FORMAT [UNTIL] 962Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 963 -6:00 US C%sT 1951 964 -6:00 Marengo C%sT 1961 Apr 30 2:00 965 -5:00 - EST 1969 966 -5:00 US E%sT 1974 Jan 6 2:00 967 -6:00 1:00 CDT 1974 Oct 27 2:00 968 -5:00 US E%sT 1976 969 -5:00 - EST 2006 970 -5:00 US E%sT 971# 972# Daviess, Dubois, Knox, and Martin Counties, Indiana, 973# switched from eastern to central time in April 2006, then switched back 974# in November 2007. 975# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 976Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D 977Rule Vincennes 1946 only - Sep lastSun 2:00 0 S 978Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D 979Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S 980Rule Vincennes 1955 only - May 1 0:00 1:00 D 981Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D 982Rule Vincennes 1960 only - Oct lastSun 2:00 0 S 983Rule Vincennes 1961 only - Sep lastSun 2:00 0 S 984Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S 985# Zone NAME STDOFF RULES FORMAT [UNTIL] 986Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53 987 -6:00 US C%sT 1946 988 -6:00 Vincennes C%sT 1964 Apr 26 2:00 989 -5:00 - EST 1969 990 -5:00 US E%sT 1971 991 -5:00 - EST 2006 Apr 2 2:00 992 -6:00 US C%sT 2007 Nov 4 2:00 993 -5:00 US E%sT 994# 995# Perry County, Indiana, switched from eastern to central time in April 2006. 996# From Alois Triendl (2019-07-09): 997# The Indianapolis News, Friday 27 October 1967 states that Perry County 998# returned to CST. It went again to EST on 27 April 1969, as documented by the 999# Indianapolis star of Saturday 26 April. 1000# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1001Rule Perry 1955 only - May 1 0:00 1:00 D 1002Rule Perry 1955 1960 - Sep lastSun 2:00 0 S 1003Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D 1004Rule Perry 1961 1963 - Oct lastSun 2:00 0 S 1005# Zone NAME STDOFF RULES FORMAT [UNTIL] 1006Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57 1007 -6:00 US C%sT 1946 1008 -6:00 Perry C%sT 1964 Apr 26 2:00 1009 -5:00 - EST 1967 Oct 29 2:00 1010 -6:00 US C%sT 1969 Apr 27 2:00 1011 -5:00 US E%sT 1971 1012 -5:00 - EST 2006 Apr 2 2:00 1013 -6:00 US C%sT 1014# 1015# Pike County, Indiana moved from central to eastern time in 1977, 1016# then switched back in 2006, then switched back again in 2007. 1017# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1018Rule Pike 1955 only - May 1 0:00 1:00 D 1019Rule Pike 1955 1960 - Sep lastSun 2:00 0 S 1020Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D 1021Rule Pike 1961 1964 - Oct lastSun 2:00 0 S 1022# Zone NAME STDOFF RULES FORMAT [UNTIL] 1023Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53 1024 -6:00 US C%sT 1955 1025 -6:00 Pike C%sT 1965 Apr 25 2:00 1026 -5:00 - EST 1966 Oct 30 2:00 1027 -6:00 US C%sT 1977 Oct 30 2:00 1028 -5:00 - EST 2006 Apr 2 2:00 1029 -6:00 US C%sT 2007 Nov 4 2:00 1030 -5:00 US E%sT 1031# 1032# Starke County, Indiana moved from central to eastern time in 1991, 1033# then switched back in 2006. 1034# From Arthur David Olson (1991-10-28): 1035# An article on page A3 of the Sunday, 1991-10-27 Washington Post 1036# notes that Starke County switched from Central time to Eastern time as of 1037# 1991-10-27. 1038# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1039Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 1040Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 1041Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 1042Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 1043Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 1044# Zone NAME STDOFF RULES FORMAT [UNTIL] 1045Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 1046 -6:00 US C%sT 1947 1047 -6:00 Starke C%sT 1962 Apr 29 2:00 1048 -5:00 - EST 1963 Oct 27 2:00 1049 -6:00 US C%sT 1991 Oct 27 2:00 1050 -5:00 - EST 2006 Apr 2 2:00 1051 -6:00 US C%sT 1052# 1053# Pulaski County, Indiana, switched from eastern to central time in 1054# April 2006 and then switched back in March 2007. 1055# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1056Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D 1057Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S 1058Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S 1059Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S 1060# Zone NAME STDOFF RULES FORMAT [UNTIL] 1061Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35 1062 -6:00 US C%sT 1946 1063 -6:00 Pulaski C%sT 1961 Apr 30 2:00 1064 -5:00 - EST 1969 1065 -5:00 US E%sT 1971 1066 -5:00 - EST 2006 Apr 2 2:00 1067 -6:00 US C%sT 2007 Mar 11 2:00 1068 -5:00 US E%sT 1069# 1070# Switzerland County, Indiana, did not observe DST from 1973 through 2005. 1071# Zone NAME STDOFF RULES FORMAT [UNTIL] 1072Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 1073 -6:00 US C%sT 1954 Apr 25 2:00 1074 -5:00 - EST 1969 1075 -5:00 US E%sT 1973 1076 -5:00 - EST 2006 1077 -5:00 US E%sT 1078 1079# From Paul Eggert (2018-03-20): 1080# The Louisville & Nashville Railroad's 1883-11-18 change occurred at 1081# 10:00 old local time; train were supposed to come to a standstill 1082# for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not 1083# clear how this matched civil time in Louisville, so for now continue 1084# to assume Louisville switched at noon new local time, like New York. 1085# 1086# From Michael Deckers (2019-08-06): 1087# From the contemporary source given by Alois Treindl, 1088# the switch in Louisville on 1946-04-28 was on 00:01 1089# From Paul Eggert (2019-08-26): 1090# That source was the Louisville Courier-Journal, 1946-04-27, p 4. 1091# Shanks gives 02:00 for all 20th-century transition times in Louisville. 1092# Evidently this is wrong for spring 1946. Although also likely wrong 1093# for other dates, we have no data. 1094# 1095# Part of Kentucky left its clocks alone in 1974. 1096# This also includes Clark, Floyd, and Harrison counties in Indiana. 1097# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1098Rule Louisville 1921 only - May 1 2:00 1:00 D 1099Rule Louisville 1921 only - Sep 1 2:00 0 S 1100Rule Louisville 1941 only - Apr lastSun 2:00 1:00 D 1101Rule Louisville 1941 only - Sep lastSun 2:00 0 S 1102Rule Louisville 1946 only - Apr lastSun 0:01 1:00 D 1103Rule Louisville 1946 only - Jun 2 2:00 0 S 1104Rule Louisville 1950 1961 - Apr lastSun 2:00 1:00 D 1105Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 1106Rule Louisville 1956 1961 - Oct lastSun 2:00 0 S 1107# Zone NAME STDOFF RULES FORMAT [UNTIL] 1108Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 1109 -6:00 US C%sT 1921 1110 -6:00 Louisville C%sT 1942 1111 -6:00 US C%sT 1946 1112 -6:00 Louisville C%sT 1961 Jul 23 2:00 1113 -5:00 - EST 1968 1114 -5:00 US E%sT 1974 Jan 6 2:00 1115 -6:00 1:00 CDT 1974 Oct 27 2:00 1116 -5:00 US E%sT 1117# 1118# Wayne County, Kentucky 1119# 1120# From Lake Cumberland LIFE 1121# http://www.lake-cumberland.com/life/archive/news990129time.shtml 1122# (1999-01-29) via WKYM-101.7: 1123# Clinton County has joined Wayne County in asking the DoT to change from 1124# the Central to the Eastern time zone.... The Wayne County government made 1125# the same request in December. And while Russell County officials have not 1126# taken action, the majority of respondents to a poll conducted there in 1127# August indicated they would like to change to "fast time" also. 1128# The three Lake Cumberland counties are the farthest east of any U.S. 1129# location in the Central time zone. 1130# 1131# From Rich Wales (2000-08-29): 1132# After prolonged debate, and despite continuing deep differences of opinion, 1133# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 1134# (-0500) time. They won't "fall back" this year. See Sara Shipley, 1135# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 1136# 1137# From Paul Eggert (2001-07-16): 1138# The final rule was published in the 1139# Federal Register 65, 160 (2000-08-17), pp 50154-50158. 1140# https://www.gpo.gov/fdsys/pkg/FR-2000-08-17/html/00-20854.htm 1141# 1142Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 1143 -6:00 US C%sT 1946 1144 -6:00 - CST 1968 1145 -6:00 US C%sT 2000 Oct 29 2:00 1146 -5:00 US E%sT 1147 1148 1149# From Rives McDow (2000-08-30): 1150# Here ... are all the changes in the US since 1985. 1151# Kearny County, KS (put all of county on central; 1152# previously split between MST and CST) ... 1990-10 1153# Starke County, IN (from CST to EST) ... 1991-10 1154# Oliver County, ND (from MST to CST) ... 1992-10 1155# West Wendover, NV (from PST TO MST) ... 1999-10 1156# Wayne County, KY (from CST to EST) ... 2000-10 1157# 1158# From Paul Eggert (2001-07-17): 1159# We don't know where the line used to be within Kearny County, KS, 1160# so omit that change for now. 1161# See America/Indiana/Knox for the Starke County, IN change. 1162# See America/North_Dakota/Center for the Oliver County, ND change. 1163# West Wendover, NV officially switched from Pacific to mountain time on 1164# 1999-10-31. See the 1165# Federal Register 64, 203 (1999-10-21), pp 56705-56707. 1166# https://www.gpo.gov/fdsys/pkg/FR-1999-10-21/html/99-27240.htm 1167# However, the Federal Register says that West Wendover already operated 1168# on mountain time, and the rule merely made this official; 1169# hence a separate tz entry is not needed. 1170 1171# Michigan 1172# 1173# From Bob Devine (1988-01-28): 1174# Michigan didn't observe DST from 1968 to 1973. 1175# 1176# From Paul Eggert (1999-03-31): 1177# Shanks writes that Michigan started using standard time on 1885-09-18, 1178# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 1179# that Detroit kept 1180# 1181# local time until 1900 when the City Council decreed that clocks should 1182# be put back twenty-eight minutes to Central Standard Time. Half the 1183# city obeyed, half refused. After considerable debate, the decision 1184# was rescinded and the city reverted to Sun time. A derisive offer to 1185# erect a sundial in front of the city hall was referred to the 1186# Committee on Sewers. Then, in 1905, Central time was adopted 1187# by city vote. 1188# 1189# This story is too entertaining to be false, so go with Howse over Shanks. 1190# 1191# From Paul Eggert (2001-03-06): 1192# Garland (1927) writes "Cleveland and Detroit advanced their clocks 1193# one hour in 1914." This change is not in Shanks. We have no more 1194# info, so omit this for now. 1195# 1196# From Paul Eggert (2019-07-06): 1197# Due to a complicated set of legal maneuvers, in 1967 Michigan did 1198# not start daylight saving time when the rest of the US did. 1199# Instead, it began DST on Jun 14 at 00:01. This was big news: 1200# the Detroit Free Press reported it at the top of Page 1 on 1201# 1967-06-14, in an article "State Adjusting to Switch to Fast Time" 1202# by Gary Blonston, above an article about Thurgood Marshall's 1203# confirmation to the US Supreme Court. Although Shanks says Detroit 1204# observed DST until 1967-10-29 00:01, that time of day seems to be 1205# incorrect, as the Free Press later said DST ended in Michigan at the 1206# same time as the rest of the US. Also, although Shanks reports no DST in 1207# Detroit in 1968, it did observe DST that year; in the November 1968 1208# election Michigan voters narrowly repealed DST, effective 1969. 1209# 1210# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 1211# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1212Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 1213Rule Detroit 1948 only - Sep lastSun 2:00 0 S 1214# Zone NAME STDOFF RULES FORMAT [UNTIL] 1215Zone America/Detroit -5:32:11 - LMT 1905 1216 -6:00 - CST 1915 May 15 2:00 1217 -5:00 - EST 1942 1218 -5:00 US E%sT 1946 1219 -5:00 Detroit E%sT 1967 Jun 14 0:01 1220 -5:00 US E%sT 1969 1221 -5:00 - EST 1973 1222 -5:00 US E%sT 1975 1223 -5:00 - EST 1975 Apr 27 2:00 1224 -5:00 US E%sT 1225# 1226# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan, 1227# switched from EST to CST/CDT in 1973. 1228# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1229Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 1230Rule Menominee 1946 only - Sep lastSun 2:00 0 S 1231Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 1232Rule Menominee 1966 only - Oct lastSun 2:00 0 S 1233# Zone NAME STDOFF RULES FORMAT [UNTIL] 1234Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 1235 -6:00 US C%sT 1946 1236 -6:00 Menominee C%sT 1969 Apr 27 2:00 1237 -5:00 - EST 1973 Apr 29 2:00 1238 -6:00 US C%sT 1239 1240# Navassa 1241# administered by the US Fish and Wildlife Service 1242# claimed by US under the provisions of the 1856 Guano Islands Act 1243# also claimed by Haiti 1244# occupied 1857/1900 by the Navassa Phosphate Co 1245# US lighthouse 1917/1996-09 1246# currently uninhabited 1247# see Mark Fineman, "An Isle Rich in Guano and Discord", 1248# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 1249# Jimmy Skaggs, _The Great Guano Rush_ (1994). 1250 1251################################################################################ 1252 1253 1254# From Paul Eggert (2017-02-10): 1255# 1256# Unless otherwise specified, the source for data through 1990 is: 1257# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 1258# San Diego: ACS Publications, Inc. (2003). 1259# Unfortunately this book contains many errors and cites no sources. 1260# 1261# Many years ago Gwillim Law wrote that a good source 1262# for time zone data was the International Air Transport 1263# Association's Standard Schedules Information Manual (IATA SSIM), 1264# published semiannually. Law sent in several helpful summaries 1265# of the IATA's data after 1990. Except where otherwise noted, 1266# IATA SSIM is the source for entries after 1990. 1267# 1268# Other sources occasionally used include: 1269# 1270# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94 1271# <https://www.jstor.org/stable/1774359>. 1272# 1273# Pearce C. The Great Daylight Saving Time Controversy. 1274# Australian Ebook Publisher. 2017. ISBN 978-1-925516-96-8. 1275# 1276# Edward W. Whitman, World Time Differences, 1277# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 1278# which I found in the UCLA library. 1279# 1280# William Willett, The Waste of Daylight, 19th edition 1281# <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf> 1282# [PDF] (1914-03) 1283# 1284# See the 'europe' file for Greenland. 1285 1286# Canada 1287 1288# From Alain LaBonté (1994-11-14): 1289# I post here the time zone abbreviations standardized in Canada 1290# for both English and French in the CAN/CSA-Z234.4-89 standard.... 1291# 1292# UTC Standard time Daylight saving time 1293# offset French English French English 1294# -2:30 - - HAT NDT 1295# -3 - - HAA ADT 1296# -3:30 HNT NST - - 1297# -4 HNA AST HAE EDT 1298# -5 HNE EST HAC CDT 1299# -6 HNC CST HAR MDT 1300# -7 HNR MST HAP PDT 1301# -8 HNP PST HAY YDT 1302# -9 HNY YST - - 1303# 1304# HN: Heure Normale ST: Standard Time 1305# HA: Heure Avancée DT: Daylight saving Time 1306# 1307# A: de l'Atlantique Atlantic 1308# C: du Centre Central 1309# E: de l'Est Eastern 1310# M: Mountain 1311# N: Newfoundland 1312# P: du Pacifique Pacific 1313# R: des Rocheuses 1314# T: de Terre-Neuve 1315# Y: du Yukon Yukon 1316# 1317# From Paul Eggert (1994-11-22): 1318# Alas, this sort of thing must be handled by localization software. 1319 1320# Unless otherwise specified, the data entries for Canada are all from Shanks 1321# & Pottenger. 1322 1323# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31, 1324# 2007-03-01): 1325# The British Columbia government announced yesterday that it will 1326# adjust daylight savings next year to align with changes in the 1327# U.S. and the rest of Canada.... 1328# https://archive.news.gov.bc.ca/releases/news_releases_2005-2009/2006AG0014-000330.htm 1329# ... 1330# Nova Scotia 1331# Daylight saving time will be extended by four weeks starting in 2007.... 1332# https://www.novascotia.ca/just/regulations/rg2/2006/ma1206.pdf 1333# 1334# [For New Brunswick] the new legislation dictates that the time change is to 1335# be done at 02:00 instead of 00:01. 1336# https://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf 1337# ... 1338# Manitoba has traditionally changed the clock every fall at 03:00. 1339# As of 2006, the transition is to take place one hour earlier at 02:00. 1340# https://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php 1341# ... 1342# [Alberta, Ontario, Quebec] will follow US rules. 1343# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM 1344# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm 1345# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF 1346# ... 1347# P.E.I. will follow US rules.... 1348# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf 1349# ... 1350# Province of Newfoundland and Labrador.... 1351# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm 1352# ... 1353# Yukon 1354# https://www.gov.yk.ca/legislation/regs/oic2006_127.pdf 1355# ... 1356# N.W.T. will follow US rules. Whoever maintains the government web site 1357# does not seem to believe in bookmarks. To see the news release, click the 1358# following link and search for "Daylight Savings Time Change". Press the 1359# "Daylight Savings Time Change" link; it will fire off a popup using 1360# JavaScript. 1361# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive 1362# ... 1363# Nunavut 1364# An amendment to the Interpretation Act was registered on February 19/2007.... 1365# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf 1366 1367# From Paul Eggert (2014-10-18): 1368# H. David Matthews and Mary Vincent's map 1369# "It's about TIME", _Canadian Geographic_ (September-October 1998) 1370# http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp 1371# contains detailed boundaries for regions observing nonstandard 1372# time and daylight saving time arrangements in Canada circa 1998. 1373# 1374# National Research Council Canada maintains info about time zones and DST. 1375# https://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html 1376# https://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5 1377# Its unofficial information is often taken from Matthews and Vincent. 1378 1379# From Paul Eggert (2006-06-27): 1380# For now, assume all of DST-observing Canada will fall into line with the 1381# new US DST rules, 1382 1383# From Chris Walton (2011-12-01) 1384# In the first of Tammy Hardwick's articles 1385# http://www.ilovecreston.com/?p=articles&t=spec&ar=260 1386# she quotes the Friday November 1/1918 edition of the Creston Review. 1387# The quote includes these two statements: 1388# 'Sunday the CPR went back to the old system of time...' 1389# '... The daylight saving scheme was dropped all over Canada at the same time,' 1390# These statements refer to a transition from daylight time to standard time 1391# that occurred nationally on Sunday October 27/1918. This transition was 1392# also documented in the Saturday October 26/1918 edition of the Toronto Star. 1393 1394# In light of that evidence, we alter the date from the earlier believed 1395# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day 1396# than Thursday) in all Canadian rulesets. 1397 1398# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1399Rule Canada 1918 only - Apr 14 2:00 1:00 D 1400Rule Canada 1918 only - Oct 27 2:00 0 S 1401Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 1402Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 1403Rule Canada 1945 only - Sep 30 2:00 0 S 1404Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 1405Rule Canada 1974 2006 - Oct lastSun 2:00 0 S 1406Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D 1407Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D 1408Rule Canada 2007 max - Nov Sun>=1 2:00 0 S 1409 1410 1411# Newfoundland and Labrador 1412 1413# From Paul Eggert (2017-10-14): 1414# Legally Labrador should observe Newfoundland time; see: 1415# McLeod J. Labrador time - legal or not? St. John's Telegram, 2017-10-07 1416# http://www.thetelegram.com/news/local/labrador-time--legal-or-not-154860/ 1417# Matthews and Vincent (1998) write that the only part of Labrador 1418# that follows the rules is the southeast corner, including Port Hope 1419# Simpson and Mary's Harbour, but excluding, say, Black Tickle. 1420 1421# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1422Rule StJohns 1917 only - Apr 8 2:00 1:00 D 1423Rule StJohns 1917 only - Sep 17 2:00 0 S 1424# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger. 1425Rule StJohns 1919 only - May 5 23:00 1:00 D 1426Rule StJohns 1919 only - Aug 12 23:00 0 S 1427# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger. 1428Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 1429Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 1430# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks & 1431# Pottenger. 1432Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 1433Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 1434# Whitman gives the following transitions: 1435# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 1436# but go with Shanks & Pottenger and assume they used Canadian rules. 1437# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 1438# Apr 30 - Sep 24; go with Shanks & Pottenger. 1439Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 1440Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 1441Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 1442Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 1443Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 1444# From Paul Eggert (2000-10-02): 1445# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 1446# at 00:01 local time. For now, assume it started in 1987. 1447 1448# From Michael Pelley (2011-09-12): 1449# We received today, Monday, September 12, 2011, notification that the 1450# changes to the Newfoundland Standard Time Act have been proclaimed. 1451# The change in the Act stipulates that the change from Daylight Savings 1452# Time to Standard Time and from Standard Time to Daylight Savings Time 1453# now occurs at 2:00AM. 1454# ... 1455# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm 1456# ... 1457# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery 1458# Office of the Chief Information Officer 1459# Executive Council 1460# Government of Newfoundland & Labrador 1461 1462Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 1463Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S 1464Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 1465Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D 1466Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D 1467Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S 1468# 1469# St John's has an apostrophe, but Posix file names can't have apostrophes. 1470# Zone NAME STDOFF RULES FORMAT [UNTIL] 1471Zone America/St_Johns -3:30:52 - LMT 1884 1472 -3:30:52 StJohns N%sT 1918 1473 -3:30:52 Canada N%sT 1919 1474 -3:30:52 StJohns N%sT 1935 Mar 30 1475 -3:30 StJohns N%sT 1942 May 11 1476 -3:30 Canada N%sT 1946 1477 -3:30 StJohns N%sT 2011 Nov 1478 -3:30 Canada N%sT 1479 1480# most of east Labrador 1481 1482# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'. 1483# Zone NAME STDOFF RULES FORMAT [UNTIL] 1484Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 1485 -3:30:52 - NST 1918 1486 -3:30:52 Canada N%sT 1919 1487 -3:30:52 - NST 1935 Mar 30 1488 -3:30 - NST 1936 1489 -3:30 StJohns N%sT 1942 May 11 1490 -3:30 Canada N%sT 1946 1491 -3:30 StJohns N%sT 1966 Mar 15 2:00 1492 -4:00 StJohns A%sT 2011 Nov 1493 -4:00 Canada A%sT 1494 1495 1496# west Labrador, Nova Scotia, Prince Edward I, 1497# Îles-de-la-Madeleine, Listuguj reserve 1498 1499# From Brian Inglis (2015-07-20): 1500# From the historical weather station records available at: 1501# https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada 1502# Sydney shares the same time history as Glace Bay, so was 1503# likely to be the same across the island.... 1504# Sydney, as the capital and most populous location, or Cape Breton, would 1505# have been better names for the zone had we known this in 1996. 1506 1507# From Paul Eggert (2015-07-20): 1508# Shanks & Pottenger write that since 1970 most of this region has been like 1509# Halifax. Many locales did not observe peacetime DST until 1972; 1510# the Cape Breton area, represented by Glace Bay, is the largest we know of 1511# (Glace Bay was perhaps not the best name choice but no point changing now). 1512# Shanks & Pottenger also write that Liverpool, NS was the only town 1513# in Canada to observe DST in 1971 but not 1970; for now we'll assume 1514# this is a typo. 1515 1516# From Jeffery Nichols (2020-01-09): 1517# America/Halifax ... also applies to Îles-de-la-Madeleine and the Listuguj 1518# reserve in Quebec. Officially, this came into effect on January 1, 2007 1519# (Legal Time Act, CQLR c T-5.1), but the legislative debates surrounding that 1520# bill say that it is "accommodating the customs and practices" of those 1521# regions, which suggests that they have always been in-line with Halifax. 1522 1523# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1524Rule Halifax 1916 only - Apr 1 0:00 1:00 D 1525Rule Halifax 1916 only - Oct 1 0:00 0 S 1526Rule Halifax 1920 only - May 9 0:00 1:00 D 1527Rule Halifax 1920 only - Aug 29 0:00 0 S 1528Rule Halifax 1921 only - May 6 0:00 1:00 D 1529Rule Halifax 1921 1922 - Sep 5 0:00 0 S 1530Rule Halifax 1922 only - Apr 30 0:00 1:00 D 1531Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 1532Rule Halifax 1923 only - Sep 4 0:00 0 S 1533Rule Halifax 1924 only - Sep 15 0:00 0 S 1534Rule Halifax 1925 only - Sep 28 0:00 0 S 1535Rule Halifax 1926 only - May 16 0:00 1:00 D 1536Rule Halifax 1926 only - Sep 13 0:00 0 S 1537Rule Halifax 1927 only - May 1 0:00 1:00 D 1538Rule Halifax 1927 only - Sep 26 0:00 0 S 1539Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 1540Rule Halifax 1928 only - Sep 9 0:00 0 S 1541Rule Halifax 1929 only - Sep 3 0:00 0 S 1542Rule Halifax 1930 only - Sep 15 0:00 0 S 1543Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 1544Rule Halifax 1932 only - May 1 0:00 1:00 D 1545Rule Halifax 1933 only - Apr 30 0:00 1:00 D 1546Rule Halifax 1933 only - Oct 2 0:00 0 S 1547Rule Halifax 1934 only - May 20 0:00 1:00 D 1548Rule Halifax 1934 only - Sep 16 0:00 0 S 1549Rule Halifax 1935 only - Jun 2 0:00 1:00 D 1550Rule Halifax 1935 only - Sep 30 0:00 0 S 1551Rule Halifax 1936 only - Jun 1 0:00 1:00 D 1552Rule Halifax 1936 only - Sep 14 0:00 0 S 1553Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 1554Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 1555Rule Halifax 1939 only - May 28 0:00 1:00 D 1556Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 1557Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 1558Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 1559Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 1560Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 1561Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 1562Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 1563Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 1564Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 1565# Zone NAME STDOFF RULES FORMAT [UNTIL] 1566Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 1567 -4:00 Halifax A%sT 1918 1568 -4:00 Canada A%sT 1919 1569 -4:00 Halifax A%sT 1942 Feb 9 2:00s 1570 -4:00 Canada A%sT 1946 1571 -4:00 Halifax A%sT 1974 1572 -4:00 Canada A%sT 1573Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 1574 -4:00 Canada A%sT 1953 1575 -4:00 Halifax A%sT 1954 1576 -4:00 - AST 1972 1577 -4:00 Halifax A%sT 1974 1578 -4:00 Canada A%sT 1579 1580# New Brunswick 1581 1582# From Paul Eggert (2007-01-31): 1583# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf> 1584# says they changed at 00:01 through 2006, and 1585# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it 1586# clear that this was the case since at least 1993. 1587# For now, assume it started in 1993. 1588 1589# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1590Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D 1591Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S 1592Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D 1593Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S 1594Rule Moncton 1939 only - May 27 1:00 1:00 D 1595Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S 1596Rule Moncton 1940 only - May 19 1:00 1:00 D 1597Rule Moncton 1941 only - May 4 1:00 1:00 D 1598Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D 1599Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S 1600Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S 1601Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D 1602Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S 1603# Zone NAME STDOFF RULES FORMAT [UNTIL] 1604Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 1605 -5:00 - EST 1902 Jun 15 1606 -4:00 Canada A%sT 1933 1607 -4:00 Moncton A%sT 1942 1608 -4:00 Canada A%sT 1946 1609 -4:00 Moncton A%sT 1973 1610 -4:00 Canada A%sT 1993 1611 -4:00 Moncton A%sT 2007 1612 -4:00 Canada A%sT 1613 1614# Quebec 1615 1616# From Paul Eggert (2020-01-10): 1617# See America/Toronto for most of Quebec, including Montreal. 1618# See America/Halifax for the Îles de la Madeleine and the Listuguj reserve. 1619# 1620# Matthews and Vincent (1998) also write that Quebec east of the -63 1621# meridian is supposed to observe AST, but residents as far east as 1622# Natashquan use EST/EDT, and residents east of Natashquan use AST. 1623# The Quebec department of justice writes in 1624# "The situation in Minganie and Basse-Côte-Nord" 1625# https://www.justice.gouv.qc.ca/en/department/ministre/functions-and-responsabilities/legal-time-in-quebec/the-situation-in-minganie-and-basse-cote-nord/ 1626# that the coastal strip from just east of Natashquan to Blanc-Sablon 1627# observes Atlantic standard time all year round. 1628# This common practice was codified into law as of 2007; see Legal Time Act, 1629# CQLR c T-5.1 <http://legisquebec.gouv.qc.ca/en/ShowDoc/cs/T-5.1>. 1630# For lack of better info, guess this practice began around 1970, contra to 1631# Shanks & Pottenger who have this region observing AST/ADT. 1632 1633# Zone NAME STDOFF RULES FORMAT [UNTIL] 1634Zone America/Blanc-Sablon -3:48:28 - LMT 1884 1635 -4:00 Canada A%sT 1970 1636 -4:00 - AST 1637 1638# Ontario 1639 1640# From Paul Eggert (2006-07-09): 1641# Shanks & Pottenger write that since 1970 most of Ontario has been like 1642# Toronto. 1643# Thunder Bay skipped DST in 1973. 1644# Many smaller locales did not observe peacetime DST until 1974; 1645# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1646# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 1647 1648# From Jeffery Nichols (2020-02-06): 1649# According to the [Shanks] atlas, those western Ontario zones are huge, 1650# covering most of Ontario northwest of Sault Ste Marie and Timmins. 1651# The zones seem to include towns bigger than the ones they're named after, 1652# like Dryden in America/Rainy_River and Wawa (and maybe Attawapiskat) in 1653# America/Nipigon. I assume it's too much trouble to change the name of the 1654# zone (like when you found out that America/Glace_Bay includes Sydney, Nova 1655# Scotia).... 1656 1657# From Mark Brader (2003-07-26): 1658# [According to the Toronto Star] Orillia, Ontario, adopted DST 1659# effective Saturday, 1912-06-22, 22:00; the article mentions that 1660# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 1661# have already done so. In Orillia DST was to run until Saturday, 1662# 1912-08-31 (no time mentioned), but it was met with considerable 1663# hostility from certain segments of the public, and was revoked after 1664# only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but 1665# presumably that should be -07-06. (1912-06-19, -07-12; also letters 1666# earlier in June). 1667# 1668# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 1669# 1670# From Paul Eggert (2017-07-08): 1671# For more on Orillia, see: Daubs K. Bold attempt at daylight saving 1672# time became a comic failure in Orillia. Toronto Star 2017-07-08. 1673# https://www.thestar.com/news/insight/2017/07/08/bold-attempt-at-daylight-saving-time-became-a-comic-failure-in-orillia.html 1674 1675# From Paul Eggert (1997-10-17): 1676# Mark Brader writes that an article in the 1997-10-14 Toronto Star 1677# says that Atikokan, Ontario currently does not observe DST, 1678# but will vote on 11-10 whether to use EST/EDT. 1679# He also writes that the Ontario Time Act (1990, Chapter T.9) 1680# http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html 1681# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 1682# Officially Atikokan is therefore on CST/CDT, and most likely this report 1683# concerns a non-official time observed as a matter of local practice. 1684# 1685# From Paul Eggert (2000-10-02): 1686# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 1687# New Osnaburgh observe CST all year, that Big Trout Lake observes 1688# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 1689# violation of the official Ontario rules. 1690# 1691# From Paul Eggert (2006-07-09): 1692# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the 1693# 2005-07-21 Chronicle-Journal, which said: 1694# 1695# The clocks in Atikokan stay set on standard time year-round. 1696# This means they spend about half the time on central time and 1697# the other half on eastern time. 1698# 1699# For the most part, the system works, Mayor Dennis Brown said. 1700# 1701# "The majority of businesses in Atikokan deal more with Eastern 1702# Canada, but there are some that deal with Western Canada," he 1703# said. "I don't see any changes happening here." 1704# 1705# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang 1706# [New Osnaburgh] follow the same practice." 1707 1708# From Garry McKinnon (2006-07-14) via Chris Walton: 1709# I chatted with a member of my board who has an outstanding memory 1710# and a long history in Atikokan (and in the telecom industry) and he 1711# can say for certain that Atikokan has been practicing the current 1712# time keeping since 1952, at least. 1713 1714# From Paul Eggert (2006-07-17): 1715# Shanks & Pottenger say that Atikokan has agreed with Rainy River 1716# ever since standard time was introduced, but the information from 1717# McKinnon sounds more authoritative. For now, assume that Atikokan 1718# switched to EST immediately after WWII era daylight saving time 1719# ended. This matches the old (less-populous) America/Coral_Harbour 1720# entry since our cutoff date of 1970, so we can move 1721# America/Coral_Harbour to the 'backward' file. 1722 1723# From Mark Brader (2010-03-06): 1724# 1725# Currently the database has: 1726# 1727# # Ontario 1728# 1729# # From Paul Eggert (2006-07-09): 1730# # Shanks & Pottenger write that since 1970 most of Ontario has been like 1731# # Toronto. 1732# # Thunder Bay skipped DST in 1973. 1733# # Many smaller locales did not observe peacetime DST until 1974; 1734# # Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1735# 1736# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom 1737# right corner of page 1, it says that Toronto will return to standard 1738# time at 2 am Sunday morning (which agrees with the database), and that: 1739# 1740# The one-hour setback will go into effect throughout most of Ontario, 1741# except in areas like Windsor which remains on standard time all year. 1742# 1743# Windsor is, of course, a lot larger than Nipigon. 1744# 1745# I only came across this incidentally. I don't know if Windsor began 1746# observing DST when Detroit did, or in 1974, or on some other date. 1747# 1748# By the way, the article continues by noting that: 1749# 1750# Some cities in the United States have pushed the deadline back 1751# three weeks and will change over from daylight saving in October. 1752 1753# From Arthur David Olson (2010-07-17): 1754# 1755# "Standard Time and Time Zones in Canada" appeared in 1756# The Journal of The Royal Astronomical Society of Canada, 1757# volume 26, number 2 (February 1932) and, as of 2010-07-17, 1758# was available at 1759# http://adsabs.harvard.edu/full/1932JRASC..26...49S 1760# 1761# It includes the text below (starting on page 57): 1762# 1763# A list of the places in Canada using daylight saving time would 1764# require yearly revision. From information kindly furnished by 1765# the provincial governments and by the postmasters in many cities 1766# and towns, it is found that the following places used daylight sav- 1767# ing in 1930. The information for the province of Quebec is definite, 1768# for the other provinces only approximate: 1769# 1770# Province Daylight saving time used 1771# Prince Edward Island Not used. 1772# Nova Scotia In Halifax only. 1773# New Brunswick In St. John only. 1774# Quebec In the following places: 1775# Montreal Lachine 1776# Quebec Mont-Royal 1777# Lévis Iberville 1778# St. Lambert Cap de la Madelèine 1779# Verdun Loretteville 1780# Westmount Richmond 1781# Outremont St. Jérôme 1782# Longueuil Greenfield Park 1783# Arvida Waterloo 1784# Chambly-Canton Beaulieu 1785# Melbourne La Tuque 1786# St. Théophile Buckingham 1787# Ontario Used generally in the cities and towns along 1788# the southerly part of the province. Not 1789# used in the northwesterly part. 1790# Manitoba Not used. 1791# Saskatchewan In Regina only. 1792# Alberta Not used. 1793# British Columbia Not used. 1794# 1795# With some exceptions, the use of daylight saving may be said to be limited 1796# to those cities and towns lying between Quebec city and Windsor, Ont. 1797 1798# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1799Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1800Rule Toronto 1919 only - Oct 26 0:00 0 S 1801Rule Toronto 1920 only - May 2 2:00 1:00 D 1802Rule Toronto 1920 only - Sep 26 0:00 0 S 1803Rule Toronto 1921 only - May 15 2:00 1:00 D 1804Rule Toronto 1921 only - Sep 15 2:00 0 S 1805Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1806# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16" 1807# was meant. 1808Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1809Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1810Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1811Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1812Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1813Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1814Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1815Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1816Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1817Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1818Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1819Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1820Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1821Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1822# Shanks & Pottenger say Toronto ended DST a week early in 1971, 1823# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this 1824# is wrong, and that he had confirmed it by checking the 1971-10-30 1825# Toronto Star, which said that DST was ending 1971-10-31 as usual. 1826Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1827 1828# From Paul Eggert (2003-07-27): 1829# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1830# Port Arthur, Ontario, the principle of the Bill has been in 1831# operation for the past three years, and in the City of Moose Jaw, 1832# Saskatchewan, for one year." 1833 1834# From David Bryan via Tory Tronrud, Director/Curator, 1835# Thunder Bay Museum (2003-11-12): 1836# There is some suggestion, however, that, by-law or not, daylight 1837# savings time was being practiced in Fort William and Port Arthur 1838# before 1909.... [I]n 1910, the line between the Eastern and Central 1839# Time Zones was permanently moved about two hundred miles west to 1840# include the Thunder Bay area.... When Canada adopted daylight 1841# savings time in 1916, Fort William and Port Arthur, having done so 1842# already, did not change their clocks.... During the Second World 1843# War,... [t]he cities agreed to implement DST during the summer 1844# months for the remainder of the war years. 1845 1846# Zone NAME STDOFF RULES FORMAT [UNTIL] 1847Zone America/Toronto -5:17:32 - LMT 1895 1848 -5:00 Canada E%sT 1919 1849 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1850 -5:00 Canada E%sT 1946 1851 -5:00 Toronto E%sT 1974 1852 -5:00 Canada E%sT 1853Zone America/Thunder_Bay -5:57:00 - LMT 1895 1854 -6:00 - CST 1910 1855 -5:00 - EST 1942 1856 -5:00 Canada E%sT 1970 1857 -5:00 Toronto E%sT 1973 1858 -5:00 - EST 1974 1859 -5:00 Canada E%sT 1860Zone America/Nipigon -5:53:04 - LMT 1895 1861 -5:00 Canada E%sT 1940 Sep 29 1862 -5:00 1:00 EDT 1942 Feb 9 2:00s 1863 -5:00 Canada E%sT 1864Zone America/Rainy_River -6:18:16 - LMT 1895 1865 -6:00 Canada C%sT 1940 Sep 29 1866 -6:00 1:00 CDT 1942 Feb 9 2:00s 1867 -6:00 Canada C%sT 1868Zone America/Atikokan -6:06:28 - LMT 1895 1869 -6:00 Canada C%sT 1940 Sep 29 1870 -6:00 1:00 CDT 1942 Feb 9 2:00s 1871 -6:00 Canada C%sT 1945 Sep 30 2:00 1872 -5:00 - EST 1873 1874 1875# Manitoba 1876 1877# From Rob Douglas (2006-04-06): 1878# the old Manitoba Time Act - as amended by Bill 2, assented to 1879# March 27, 1987 ... said ... 1880# "between two o'clock Central Standard Time in the morning of 1881# the first Sunday of April of each year and two o'clock Central 1882# Standard Time in the morning of the last Sunday of October next 1883# following, one hour in advance of Central Standard Time."... 1884# I believe that the English legislation [of the old time act] had 1885# been assented to (March 22, 1967).... 1886# Also, as far as I can tell, there was no order-in-council varying 1887# the time of Daylight Saving Time for 2005 and so the provisions of 1888# the 1987 version would apply - the changeover was at 2:00 Central 1889# Standard Time (i.e. not until 3:00 Central Daylight Time). 1890 1891# From Paul Eggert (2006-04-10): 1892# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s) 1893# starting 1966. Since 02:00s is clearly correct for 1967 on, assume 1894# it was also 02:00s in 1966. 1895 1896# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1897Rule Winn 1916 only - Apr 23 0:00 1:00 D 1898Rule Winn 1916 only - Sep 17 0:00 0 S 1899Rule Winn 1918 only - Apr 14 2:00 1:00 D 1900Rule Winn 1918 only - Oct 27 2:00 0 S 1901Rule Winn 1937 only - May 16 2:00 1:00 D 1902Rule Winn 1937 only - Sep 26 2:00 0 S 1903Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1904Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1905Rule Winn 1945 only - Sep lastSun 2:00 0 S 1906Rule Winn 1946 only - May 12 2:00 1:00 D 1907Rule Winn 1946 only - Oct 13 2:00 0 S 1908Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1909Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1910Rule Winn 1950 only - May 1 2:00 1:00 D 1911Rule Winn 1950 only - Sep 30 2:00 0 S 1912Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1913Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1914Rule Winn 1959 only - Oct lastSun 2:00 0 S 1915Rule Winn 1960 only - Sep lastSun 2:00 0 S 1916Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1917Rule Winn 1963 only - Sep 22 2:00 0 S 1918Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D 1919Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S 1920Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D 1921# Zone NAME STDOFF RULES FORMAT [UNTIL] 1922Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1923 -6:00 Winn C%sT 2006 1924 -6:00 Canada C%sT 1925 1926 1927# Saskatchewan 1928 1929# From Mark Brader (2003-07-26): 1930# The first actual adoption of DST in Canada was at the municipal 1931# level. As the [Toronto] Star put it (1912-06-07), "While people 1932# elsewhere have long been talking of legislation to save daylight, 1933# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1934# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1935# presumably late evening, as below), and would run until "the end of 1936# the summer". The discrepancy between municipal time and railroad 1937# time was noted. 1938 1939# From Paul Eggert (2003-07-27): 1940# Willett (1914-03) notes that DST "has been in operation ... in the 1941# City of Moose Jaw, Saskatchewan, for one year." 1942 1943# From Paul Eggert (2019-07-25): 1944# Pearce's book says Regina observed DST in 1914-1917. No dates and times, 1945# unfortunately. It also says that in 1914 Saskatoon observed DST 1946# from 1 June to 6 July, and that DST was also tried out in Davidson, 1947# Melfort, and Prince Albert. 1948 1949# From Paul Eggert (2006-03-22): 1950# Shanks & Pottenger say that since 1970 this region has mostly been as Regina. 1951# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1952# Other western towns (e.g. Lloydminster) are like Edmonton. 1953# Matthews and Vincent (1998) write that Denare Beach and Creighton 1954# are like Winnipeg, in violation of Saskatchewan law. 1955 1956# From W. Jones (1992-11-06): 1957# The. . .below is based on information I got from our law library, the 1958# provincial archives, and the provincial Community Services department. 1959# A precise history would require digging through newspaper archives, and 1960# since you didn't say what you wanted, I didn't bother. 1961# 1962# Saskatchewan is split by a time zone meridian (105W) and over the years 1963# the boundary became pretty ragged as communities near it reevaluated 1964# their affiliations in one direction or the other. In 1965 a provincial 1965# referendum favoured legislating common time practices. 1966# 1967# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1968# Saskatchewan 1978) was proclaimed, and established that the eastern 1969# part of Saskatchewan would use CST year round, that districts in 1970# northwest Saskatchewan would by default follow CST but could opt to 1971# follow Mountain Time rules (thus 1 hour difference in the winter and 1972# zero in the summer), and that districts in southwest Saskatchewan would 1973# by default follow MT but could opt to follow CST. 1974# 1975# It took a few years for the dust to settle (I know one story of a town 1976# on one time zone having its school in another, such that a mom had to 1977# serve her family lunch in two shifts), but presently it seems that only 1978# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1979# rules any more; all other districts appear to have used CST year round 1980# since sometime in the 1960s. 1981 1982# From Chris Walton (2006-06-26): 1983# The Saskatchewan time act which was last updated in 1996 is about 30 pages 1984# long and rather painful to read. 1985# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf 1986 1987# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1988Rule Regina 1918 only - Apr 14 2:00 1:00 D 1989Rule Regina 1918 only - Oct 27 2:00 0 S 1990Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1991Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1992Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1993Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1994Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1995Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1996Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1997Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1998Rule Regina 1945 only - Sep lastSun 2:00 0 S 1999Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 2000Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 2001Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 2002Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 2003Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 2004Rule Regina 1959 only - Oct lastSun 2:00 0 S 2005# 2006Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 2007Rule Swift 1957 only - Oct lastSun 2:00 0 S 2008Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 2009Rule Swift 1959 only - Oct lastSun 2:00 0 S 2010Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 2011# Zone NAME STDOFF RULES FORMAT [UNTIL] 2012Zone America/Regina -6:58:36 - LMT 1905 Sep 2013 -7:00 Regina M%sT 1960 Apr lastSun 2:00 2014 -6:00 - CST 2015Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 2016 -7:00 Canada M%sT 1946 Apr lastSun 2:00 2017 -7:00 Regina M%sT 1950 2018 -7:00 Swift M%sT 1972 Apr lastSun 2:00 2019 -6:00 - CST 2020 2021 2022# Alberta 2023 2024# From Alois Triendl (2019-07-19): 2025# There was no DST in Alberta in 1967... Calgary Herald, 29 April 1967. 2026# 1969, no DST, from Edmonton Journal 18 April 1969 2027# 2028# From Paul Eggert (2019-07-25): 2029# Pearce's book says that Alberta's 1948 Daylight Saving Act required 2030# Mountain Standard Time without DST, and that "anyone who broke that law 2031# could be fined up to $25 and costs". There seems to be no record of 2032# anybody paying the fine. The law was not changed until an August 1971 2033# plebiscite reinstituted DST in 1972. This story is also mentioned in: 2034# Boyer JP. Forcing Choice: The Risky Reward of Referendums. Dundum. 2017. 2035# ISBN 978-1459739123. 2036 2037# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2038Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 2039Rule Edm 1918 only - Oct 27 2:00 0 S 2040Rule Edm 1919 only - May 27 2:00 0 S 2041Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 2042Rule Edm 1920 only - Oct lastSun 2:00 0 S 2043Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 2044Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 2045Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 2046Rule Edm 1945 only - Sep lastSun 2:00 0 S 2047Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 2048Rule Edm 1947 only - Sep lastSun 2:00 0 S 2049Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 2050Rule Edm 1972 2006 - Oct lastSun 2:00 0 S 2051# Zone NAME STDOFF RULES FORMAT [UNTIL] 2052Zone America/Edmonton -7:33:52 - LMT 1906 Sep 2053 -7:00 Edm M%sT 1987 2054 -7:00 Canada M%sT 2055 2056 2057# British Columbia 2058 2059# From Paul Eggert (2006-03-22): 2060# Shanks & Pottenger write that since 1970 most of this region has 2061# been like Vancouver. 2062# Dawson Creek uses MST. Much of east BC is like Edmonton. 2063# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 2064 2065# It seems though that (re: Creston) is not entirely correct: 2066 2067# From Chris Walton (2011-12-01): 2068# There are two areas within the Canadian province of British Columbia 2069# that do not currently observe daylight saving: 2070# a) The Creston Valley (includes the town of Creston and surrounding area) 2071# b) The eastern half of the Peace River Regional District 2072# (includes the cities of Dawson Creek and Fort St. John) 2073 2074# Earlier this year I stumbled across a detailed article about the time 2075# keeping history of Creston; it was written by Tammy Hardwick who is the 2076# manager of the Creston & District Museum. The article was written in May 2009. 2077# http://www.ilovecreston.com/?p=articles&t=spec&ar=260 2078# According to the article, Creston has not changed its clocks since June 1918. 2079# i.e. Creston has been stuck on UT-7 for 93 years. 2080# Dawson Creek, on the other hand, changed its clocks as recently as April 1972. 2081 2082# Unfortunately the exact date for the time change in June 1918 remains 2083# unknown and will be difficult to ascertain. I e-mailed Tammy a few months 2084# ago to ask if Sunday June 2 was a reasonable guess. She said it was just 2085# as plausible as any other date (in June). She also said that after writing 2086# the article she had discovered another time change in 1916; this is the 2087# subject of another article which she wrote in October 2010. 2088# http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56 2089 2090# Here is a summary of the three clock change events in Creston's history: 2091# 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7) 2092# Exact date unknown 2093# 2. Oct 1916: switch to Pacific Standard Time (GMT-8) 2094# Exact date in October unknown; Sunday October 1 is a reasonable guess. 2095# 3. June 1918: switch to Pacific Daylight Time (GMT-7) 2096# Exact date in June unknown; Sunday June 2 is a reasonable guess. 2097# note 1: 2098# On Oct 27/1918 when daylight saving ended in the rest of Canada, 2099# Creston did not change its clocks. 2100# note 2: 2101# During WWII when the Federal Government legislated a mandatory clock change, 2102# Creston did not oblige. 2103# note 3: 2104# There is no guarantee that Creston will remain on Mountain Standard Time 2105# (UTC-7) forever. 2106# The subject was debated at least once this year by the town Council. 2107# http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html 2108 2109# During a period WWII, summer time (Daylight saying) was mandatory in Canada. 2110# In Creston, that was handled by shifting the area to PST (-8:00) then applying 2111# summer time to cause the offset to be -7:00, the same as it had been before 2112# the change. It can be argued that the timezone abbreviation during this 2113# period should be PDT rather than MST, but that doesn't seem important enough 2114# (to anyone) to further complicate the rules. 2115 2116# The transition dates (and times) are guesses. 2117 2118# From Matt Johnson (2015-09-21): 2119# Fort Nelson, BC, Canada will cancel DST this year. So while previously they 2120# were aligned with America/Vancouver, they're now aligned with 2121# America/Dawson_Creek. 2122# http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html 2123# 2124# From Tim Parenti (2015-09-23): 2125# This requires a new zone for the Northern Rockies Regional Municipality, 2126# America/Fort_Nelson. The resolution of 2014-12-08 was reached following a 2127# 2014-11-15 poll with nearly 75% support. Effectively, the municipality has 2128# been on MST (-0700) like Dawson Creek since it advanced its clocks on 2129# 2015-03-08. 2130# 2131# From Paul Eggert (2019-07-25): 2132# Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver. 2133# Alois Triendl confirmed this on 07-22, citing the 1946-04-27 Vancouver Daily 2134# Province. He also cited the 1946-09-28 Victoria Daily Times, which said 2135# that Vancouver, Victoria, etc. "change at midnight Saturday"; for now, 2136# guess they meant 02:00 Sunday since 02:00 was common practice in Vancouver. 2137# 2138# Early Vancouver, Volume Four, by Major J.S. Matthews, V.D., 2011 edition 2139# says that a 1922 plebiscite adopted DST, but a 1923 plebiscite rejected it. 2140# http://former.vancouver.ca/ctyclerk/archives/digitized/EarlyVan/SearchEarlyVan/Vol4pdf/MatthewsEarlyVancouverVol4_DaylightSavings.pdf 2141# A catalog entry for a newspaper clipping seems to indicate that Vancouver 2142# observed DST in 1941 from 07-07 through 09-27; see 2143# https://searcharchives.vancouver.ca/daylight-saving-1918-starts-again-july-7-1941-start-d-s-sept-27-end-of-d-s-1941 2144# We have no further details, so omit them for now. 2145 2146# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2147Rule Vanc 1918 only - Apr 14 2:00 1:00 D 2148Rule Vanc 1918 only - Oct 27 2:00 0 S 2149Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 2150Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 2151Rule Vanc 1945 only - Sep 30 2:00 0 S 2152Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 2153Rule Vanc 1946 only - Sep 29 2:00 0 S 2154Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 2155Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S 2156# Zone NAME STDOFF RULES FORMAT [UNTIL] 2157Zone America/Vancouver -8:12:28 - LMT 1884 2158 -8:00 Vanc P%sT 1987 2159 -8:00 Canada P%sT 2160Zone America/Dawson_Creek -8:00:56 - LMT 1884 2161 -8:00 Canada P%sT 1947 2162 -8:00 Vanc P%sT 1972 Aug 30 2:00 2163 -7:00 - MST 2164Zone America/Fort_Nelson -8:10:47 - LMT 1884 2165 -8:00 Vanc P%sT 1946 2166 -8:00 - PST 1947 2167 -8:00 Vanc P%sT 1987 2168 -8:00 Canada P%sT 2015 Mar 8 2:00 2169 -7:00 - MST 2170Zone America/Creston -7:46:04 - LMT 1884 2171 -7:00 - MST 1916 Oct 1 2172 -8:00 - PST 1918 Jun 2 2173 -7:00 - MST 2174 2175# Northwest Territories, Nunavut, Yukon 2176 2177# From Paul Eggert (2006-03-22): 2178# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 2179# Mathew Englander (1996-10-07) gives the following refs: 2180# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 2181# c. 7 defines Yukon standard time as UTC-9.... 2182# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 2183# [https://www.canlii.org/en/ca/laws/stat/rsc-1985-c-i-21/latest/rsc-1985-c-i-21.html] 2184# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 2185# * O.I.C. 1980/02 established DST. 2186# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 2187 2188# From Brian Inglis (2015-04-14): 2189# 2190# I tried to trace the history of Yukon time and found the following 2191# regulations, giving the reference title and URL if found, regulation name, 2192# and relevant quote if available. Each regulation specifically revokes its 2193# predecessor. The final reference is to the current Interpretation Act 2194# authorizing and resulting from these regulatory changes. 2195# 2196# Only recent regulations were retrievable via Yukon government site search or 2197# index, and only some via Canadian legal sources. Other sources used include 2198# articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS 2199# Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and 2200# 1970 quoted below; each article includes current extracts from provincial 2201# and territorial ST and DST regulations at the end, summaries and details of 2202# standard times and daylight saving time at many locations across Canada, 2203# with time zone maps, tables and calculations for Canadian Sunrise, Sunset, 2204# and LMST; they also cover many countries and global locations, with a chart 2205# and table showing current Universal Time offsets, and may be useful as 2206# another source of information for 1970 and earlier. 2207# 2208# * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26, 2209# pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS) 2210# http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75: 2211# Yukon Interpretation Ordinance 2212# Yukon standard time is the local mean time at the one hundred and 2213# thirty-fifth meridian. 2214# 2215# * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.; 2216# JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System 2217# (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1: 2218# Yukon Interpretation Ordinance, 1955, Chap. 16. 2219# 2220# (1) Subject to this section, standard time shall be reckoned as nine 2221# hours behind Greenwich Time and called Yukon Standard Time. 2222# 2223# (2) Notwithstanding subsection (1), the Commissioner may make regulations 2224# varying the manner of reckoning standard time. 2225# 2226# * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance 2227# [no online source found] 2228# 2229# * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC, 2230# Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS) 2231# http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon 2232# Territory Commissioner's Order 1967-59 Interpretation Ordinance ... 2233# 2234# 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon 2235# Territory on 27th January, 1966, is hereby revoked. 2236# 2237# 2. Yukon (East) Standard Time as defined by section 36 of the 2238# Interpretation Ordinance from and after mid-night on the 28th day of May, 2239# 1967 shall be reckoned in the same manner as Pacific Standard Time, that 2240# is to say, eight hours behind Greenwich Time in the area of the Yukon 2241# Territory lying east of the 138th degree longitude west. 2242# 2243# 3. In the remainder of the Territory, lying west of the 138th degree 2244# longitude west, Yukon (West) Standard Time shall be reckoned as nine 2245# hours behind Greenwich Time. 2246# 2247# * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214 2248# https://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html 2249# C.O. 1973/214 INTERPRETATION ACT ... 2250# 2251# 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby 2252# revoked. 2253# 2254# 2. Yukon Standard Time as defined by section 36 of the Interpretation 2255# Act from and after midnight on the twenty-eighth day of October, 1973 2256# shall be reckoned in the same manner as Pacific Standard Time, that is 2257# to say eight hours behind Greenwich Time. 2258# 2259# * O.I.C. 1980/02 INTERPRETATION ACT 2260# [no online source found] 2261# 2262# * Yukon Daylight Saving Time, YOIC 1987/56 2263# https://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html 2264# O.I.C. 1987/056 INTERPRETATION ACT ... 2265# 2266# In every year between 2267# (a) two o'clock in the morning in the first Sunday in April, and 2268# (b) two o'clock in the morning in the last Sunday in October, 2269# Standard Time shall be reckoned as seven hours behind Greenwich Time and 2270# called Yukon Daylight Saving Time. 2271# ... 2272# Dated ... 9th day of March, A.D., 1987. 2273# 2274# * Yukon Daylight Saving Time 2006, YOIC 2006/127 2275# https://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html 2276# O.I.C. 2006/127 INTERPRETATION ACT ... 2277# 2278# 1. In Yukon each year the time for general purposes shall be 7 hours 2279# behind Greenwich mean time during the period commencing at two o'clock 2280# in the forenoon on the second Sunday of March and ending at two o'clock 2281# in the forenoon on the first Sunday of November and shall be called 2282# Yukon Daylight Saving Time. 2283# 2284# 2. Order-in-Council 1987/56 is revoked. 2285# 2286# 3. This order comes into force January 1, 2007. 2287# 2288# * Interpretation Act, RSY 2002, c 125 2289# https://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html 2290 2291# From Rives McDow (1999-09-04): 2292# Nunavut ... moved ... to incorporate the whole territory into one time zone. 2293# Nunavut moves to single time zone Oct. 31 2294# http://www.nunatsiaq.com/nunavut/nvt90903_13.html 2295# 2296# From Antoine Leca (1999-09-06): 2297# We then need to create a new timezone for the Kitikmeot region of Nunavut 2298# to differentiate it from the Yellowknife region. 2299 2300# From Paul Eggert (1999-09-20): 2301# Basic Facts: The New Territory 2302# http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html 2303# (1999) reports that Pangnirtung operates on eastern time, 2304# and that Coral Harbour does not observe DST. We don't know when 2305# Pangnirtung switched to eastern time; we'll guess 1995. 2306 2307# From Rives McDow (1999-11-08): 2308# On October 31, when the rest of Nunavut went to Central time, 2309# Pangnirtung wobbled. Here is the result of their wobble: 2310# 2311# The following businesses and organizations in Pangnirtung use Central Time: 2312# 2313# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 2314# Eastern Arctic National Parks, A & D Specialist 2315# 2316# The following businesses and organizations in Pangnirtung use Eastern Time: 2317# 2318# Hamlet office, All other businesses, Both schools, Airport operator 2319# 2320# This has made for an interesting situation there, which warranted the news. 2321# No one there that I spoke with seems concerned, or has plans to 2322# change the local methods of keeping time, as it evidently does not 2323# really interfere with any activities or make things difficult locally. 2324# They plan to celebrate New Year's turn-over twice, one hour apart, 2325# so it appears that the situation will last at least that long. 2326# The Nunavut Intergovernmental Affairs hopes that they will "come to 2327# their senses", but the locals evidently don't see any problem with 2328# the current state of affairs. 2329 2330# From Michaela Rodrigue, writing in the 2331# Nunatsiaq News (1999-11-19): 2332# http://www.nunatsiaqonline.ca/archives/nunavut991130/nvt91119_17.html 2333# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 2334# central - or Nunavut time - for government offices, and eastern time 2335# for municipal offices and schools.... Igloolik [was similar but then] 2336# made the switch to central time on Saturday, Nov. 6. 2337 2338# From Paul Eggert (2000-10-02): 2339# Matthews and Vincent (1998) say the following, but we lack histories 2340# for these potential new Zones. 2341# 2342# The Canadian Forces station at Alert uses Eastern Time while the 2343# handful of residents at the Eureka weather station [in the Central 2344# zone] skip daylight savings. Baffin Island, which is crossed by the 2345# Central, Eastern and Atlantic Time zones only uses Eastern Time. 2346# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 2347# Central Time and Southampton Island [in the Central zone] is not 2348# required to use daylight savings. 2349 2350# From <http://www.nunatsiaqonline.ca/archives/nunavut001130/nvt21110_02.html> 2351# Nunavut now has two time zones (2000-11-10): 2352# The Nunavut government would allow its employees in Kugluktuk and 2353# Cambridge Bay to operate on central time year-round, putting them 2354# one hour behind the rest of Nunavut for six months during the winter. 2355# At the end of October the two communities had rebelled against 2356# Nunavut's unified time zone, refusing to shift to eastern time with 2357# the rest of the territory for the winter. Cambridge Bay remained on 2358# central time, while Kugluktuk, even farther west, reverted to 2359# mountain time, which they had used before the advent of Nunavut's 2360# unified time zone in 1999. 2361# 2362# From Rives McDow (2001-01-20), quoting the Nunavut government: 2363# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 2364 2365# From Paul Eggert (2000-12-04): 2366# Let's just keep track of the official times for now. 2367 2368# From Rives McDow (2001-03-07): 2369# The premier of Nunavut has issued a ministerial statement advising 2370# that effective 2001-04-01, the territory of Nunavut will revert 2371# back to three time zones (mountain, central, and eastern). Of the 2372# cities in Nunavut, Coral Harbor is the only one that I know of that 2373# has said it will not observe dst, staying on EST year round. I'm 2374# checking for more info, and will get back to you if I come up with 2375# more. 2376# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 2377 2378# From Gwillim Law (2005-05-21): 2379# According to ... 2380# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 2381# (from a 1998 Canadian Geographic article), the de facto and de jure time 2382# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 2383# round. Using Google, it's easy to find other websites that confirm this. 2384# I wasn't able to find how far back this time regimen goes, but since it 2385# predates the creation of Nunavut, it probably goes back many years.... 2386# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 2387# 2388# From Paul Eggert (2014-10-17): 2389# For lack of better information, assume that Southampton Island observed 2390# daylight saving only during wartime. Gwillim Law's email also 2391# mentioned maps now maintained by National Research Council Canada; 2392# see above for an up-to-date link. 2393 2394# From Chris Walton (2007-03-01): 2395# ... the community of Resolute (located on Cornwallis Island in 2396# Nunavut) moved from Central Time to Eastern Time last November. 2397# Basically the community did not change its clocks at the end of 2398# daylight saving.... 2399# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html 2400 2401# From Chris Walton (2011-03-21): 2402# Back in 2007 I initiated the creation of a new "zone file" for Resolute 2403# Bay. Resolute Bay is a small community located about 900km north of 2404# the Arctic Circle. The zone file was required because Resolute Bay had 2405# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007. 2406# 2407# According to new information which I received last week, Resolute Bay 2408# went back to using UTC-6 in the winter of 2007-2008... 2409# 2410# On March 11/2007 most of Canada went onto daylight saving. On March 2411# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I 2412# talked to somebody that was both knowledgeable and helpful. I was able 2413# to confirm that Resolute Bay was still operating on UTC-5. It was 2414# explained to me that Resolute Bay had been on the Eastern Time zone 2415# (EST) in the winter, and was now back on the Central Time zone (CDT). 2416# i.e. the time zone had changed twice in the last year but the clocks 2417# had not moved. The residents had to know which time zone they were in 2418# so they could follow the correct TV schedule... 2419# 2420# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I 2421# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature 2422# of the phone call, I decided to seek out an alternate source of 2423# information. I found an e-mail address for somebody by the name of 2424# Stephanie Adams whose job was listed as "Inns North Support Officer for 2425# Arctic Co-operatives." I was under the impression that Stephanie lived 2426# and worked in Resolute Bay... 2427# 2428# On March 14/2011 I phoned the hamlet office again. I was told that 2429# Resolute Bay had been using Central Standard Time over the winter of 2430# 2010-2011 and that the clocks had therefore been moved one hour ahead 2431# on March 13/2011. The person I talked to was aware that Resolute Bay 2432# had previously experimented with Eastern Standard Time but he could not 2433# tell me when the practice had stopped. 2434# 2435# On March 17/2011 I searched the Web to find an e-mail address of 2436# somebody that might be able to tell me exactly when Resolute Bay went 2437# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz 2438# used to be the mayor of Resolute Bay and he apparently owns half the 2439# businesses including "South Camp Inn." This website has some info on 2440# Aziz: 2441# http://www.uphere.ca/node/493 2442# 2443# I sent Aziz an e-mail asking when Resolute Bay had stopped using 2444# Eastern Standard Time. 2445# 2446# Aziz responded quickly with this: "hi, The time was not changed for the 2447# 1 year only, the following year, the community went back to the old way 2448# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in 2449# the winter Zulu plus 6 hrs" 2450# 2451# This of course conflicted with everything I had ascertained in November 2008. 2452# 2453# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz 2454# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You 2455# may want to check with the weather office in Resolute Bay or do a 2456# search on the weather through Env. Canada. web site" 2457# 2458# If I had realized the Stephanie did not live in Resolute Bay I would 2459# never have contacted her. I now believe that all the information I 2460# obtained in November 2008 should be ignored... 2461# I apologize for reporting incorrect information in 2008. 2462 2463# From Tim Parenti (2020-03-05): 2464# The government of Yukon announced [yesterday] the cessation of seasonal time 2465# changes. "After clocks are pushed ahead one hour on March 8, the territory 2466# will remain on [UTC-07]. ... [The government] found 93 per cent of 2467# respondents wanted to end seasonal time changes and, of that group, 70 per 2468# cent wanted 'permanent Pacific Daylight Saving Time.'" 2469# https://www.cbc.ca/news/canada/north/yukon-end-daylight-saving-time-1.5486358 2470# 2471# Although the government press release prefers PDT, we prefer MST for 2472# consistency with nearby Dawson Creek, Creston, and Fort Nelson. 2473# https://yukon.ca/en/news/yukon-end-seasonal-time-change 2474 2475# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2476Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 2477Rule NT_YK 1918 only - Oct 27 2:00 0 S 2478Rule NT_YK 1919 only - May 25 2:00 1:00 D 2479Rule NT_YK 1919 only - Nov 1 0:00 0 S 2480Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 2481Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 2482Rule NT_YK 1945 only - Sep 30 2:00 0 S 2483Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 2484Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 2485Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 2486Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S 2487Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D 2488# Zone NAME STDOFF RULES FORMAT [UNTIL] 2489# aka Panniqtuuq 2490Zone America/Pangnirtung 0 - -00 1921 # trading post est. 2491 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 2492 -5:00 Canada E%sT 1999 Oct 31 2:00 2493 -6:00 Canada C%sT 2000 Oct 29 2:00 2494 -5:00 Canada E%sT 2495# formerly Frobisher Bay 2496Zone America/Iqaluit 0 - -00 1942 Aug # Frobisher Bay est. 2497 -5:00 NT_YK E%sT 1999 Oct 31 2:00 2498 -6:00 Canada C%sT 2000 Oct 29 2:00 2499 -5:00 Canada E%sT 2500# aka Qausuittuq 2501Zone America/Resolute 0 - -00 1947 Aug 31 # Resolute founded 2502 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2503 -5:00 - EST 2001 Apr 1 3:00 2504 -6:00 Canada C%sT 2006 Oct 29 2:00 2505 -5:00 - EST 2007 Mar 11 3:00 2506 -6:00 Canada C%sT 2507# aka Kangiqiniq 2508Zone America/Rankin_Inlet 0 - -00 1957 # Rankin Inlet founded 2509 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2510 -5:00 - EST 2001 Apr 1 3:00 2511 -6:00 Canada C%sT 2512# aka Iqaluktuuttiaq 2513Zone America/Cambridge_Bay 0 - -00 1920 # trading post est.? 2514 -7:00 NT_YK M%sT 1999 Oct 31 2:00 2515 -6:00 Canada C%sT 2000 Oct 29 2:00 2516 -5:00 - EST 2000 Nov 5 0:00 2517 -6:00 - CST 2001 Apr 1 3:00 2518 -7:00 Canada M%sT 2519Zone America/Yellowknife 0 - -00 1935 # Yellowknife founded? 2520 -7:00 NT_YK M%sT 1980 2521 -7:00 Canada M%sT 2522Zone America/Inuvik 0 - -00 1953 # Inuvik founded 2523 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 2524 -7:00 NT_YK M%sT 1980 2525 -7:00 Canada M%sT 2526Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 2527 -9:00 NT_YK Y%sT 1967 May 28 0:00 2528 -8:00 NT_YK P%sT 1980 2529 -8:00 Canada P%sT 2020 Mar 8 2:00 2530 -7:00 - MST 2531Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 2532 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 2533 -8:00 NT_YK P%sT 1980 2534 -8:00 Canada P%sT 2020 Mar 8 2:00 2535 -7:00 - MST 2536 2537 2538############################################################################### 2539 2540# Mexico 2541 2542# From Paul Eggert (2014-12-07): 2543# The Investigation and Analysis Service of the 2544# Mexican Library of Congress (MLoC) has published a 2545# history of Mexican local time (in Spanish) 2546# http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm 2547# 2548# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC. 2549# (In all cases we go with the MLoC.) 2550# S&P report that Baja was at -8:00 in 1922/1923. 2551# S&P say the 1930 transition in Baja was 1930-11-16. 2552# S&P report no DST during summer 1931. 2553# S&P report a transition at 1932-03-30 23:00, not 1932-04-01. 2554 2555# From Gwillim Law (2001-02-20): 2556# There are some other discrepancies between the Decrees page and the 2557# tz database. I think they can best be explained by supposing that 2558# the researchers who prepared the Decrees page failed to find some of 2559# the relevant documents. 2560 2561# From Alan Perry (1996-02-15): 2562# A guy from our Mexico subsidiary finally found the Presidential Decree 2563# outlining the timezone changes in Mexico. 2564# 2565# ------------- Begin Forwarded Message ------------- 2566# 2567# I finally got my hands on the Official Presidential Decree that sets up the 2568# rules for the DST changes. The rules are: 2569# 2570# 1. The country is divided in 3 timezones: 2571# - Baja California Norte (the Mexico/BajaNorte TZ) 2572# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 2573# - The rest of the country (the Mexico/General TZ) 2574# 2575# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 2576# at 2:00 AM, the times in each zone are as follows: 2577# BajaNorte: GMT+7 2578# BajaSur: GMT+6 2579# General: GMT+5 2580# 2581# 3. The rest of the year, the times are as follows: 2582# BajaNorte: GMT+8 2583# BajaSur: GMT+7 2584# General: GMT+6 2585# 2586# The Decree was published in Mexico's Official Newspaper on January 4th. 2587# 2588# -------------- End Forwarded Message -------------- 2589# From Paul Eggert (1996-06-12): 2590# For an English translation of the decree, see 2591# "Diario Oficial: Time Zone Changeover" (1996-01-04). 2592# http://mexico-travel.com/extra/timezone_eng.html 2593 2594# From Rives McDow (1998-10-08): 2595# The State of Quintana Roo has reverted back to central STD and DST times 2596# (i.e. UTC -0600 and -0500 as of 1998-08-02). 2597 2598# From Rives McDow (2000-01-10): 2599# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 2600# zone 5 hours from the International Date Line, and will not observe daylight 2601# savings time so as to stay on the same time zone as the southern part of 2602# Arizona year round. 2603 2604# From Jesper Nørgaard, translating 2605# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 2606# In Oaxaca, the 55.000 teachers from the Section 22 of the National 2607# Syndicate of Education Workers, refuse to apply daylight saving each 2608# year, so that the more than 10,000 schools work at normal hour the 2609# whole year. 2610 2611# From Gwillim Law (2001-01-19): 2612# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 2613# (translated):... 2614# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 2615# that Summer Time will be reduced from seven to five months, starting 2616# this year.... 2617# http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001 2618# [translated], says "summer time will ... take effect on the first Sunday 2619# in May, and end on the last Sunday of September. 2620 2621# From Arthur David Olson (2001-01-25): 2622# The 2001-01-24 traditional Washington Post contained the page one 2623# story "Timely Issue Divides Mexicans."... 2624# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 2625# ... Mexico City Mayor López Obrador "...is threatening to keep 2626# Mexico City and its 20 million residents on a different time than 2627# the rest of the country..." In particular, López Obrador would abolish 2628# observation of Daylight Saving Time. 2629 2630# Official statute published by the Energy Department 2631# http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre 2632# (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 2633# and Sonora with no DST. This was reported by Jesper Nørgaard (2001-02-03). 2634 2635# From Paul Eggert (2001-03-03): 2636# 2637# https://www.latimes.com/archives/la-xpm-2001-mar-03-mn-32561-story.html 2638# James F. Smith writes in today's LA Times 2639# * Sonora will continue to observe standard time. 2640# * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that 2641# the Federal District will not adopt DST. 2642# * 4 of 16 district leaders announced they'll ignore the decree. 2643# * The decree does not affect federal-controlled facilities including 2644# the airport, banks, hospitals, and schools. 2645# 2646# For now we'll assume that the Federal District will bow to federal rules. 2647 2648# From Jesper Nørgaard (2001-04-01): 2649# I found some references to the Mexican application of daylight 2650# saving, which modifies what I had already sent you, stating earlier 2651# that a number of northern Mexican states would go on daylight 2652# saving. The modification reverts this to only cover Baja California 2653# (Norte), while all other states (except Sonora, who has no daylight 2654# saving all year) will follow the original decree of president 2655# Vicente Fox, starting daylight saving May 6, 2001 and ending 2656# September 30, 2001. 2657# References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp> 2658# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 2659 2660# From Reuters (2001-09-04): 2661# Mexico's Supreme Court on Tuesday declared that daylight savings was 2662# unconstitutional in Mexico City, creating the possibility the 2663# capital will be in a different time zone from the rest of the nation 2664# next year.... The Supreme Court's ruling takes effect at 2:00 2665# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 2666# standard time. "This is so residents of the Federal District are not 2667# subject to unexpected time changes," a statement from the court said. 2668 2669# From Jesper Nørgaard Welen (2002-03-12): 2670# ... consulting my local grocery store(!) and my coworkers, they all insisted 2671# that a new decision had been made to reinstate US style DST in Mexico.... 2672# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 2673# confirms this. Sonora as usual is the only state where DST is not applied. 2674 2675# From Steffen Thorsen (2009-12-28): 2676# 2677# Steffen Thorsen wrote: 2678# > Mexico's House of Representatives has approved a proposal for northern 2679# > Mexico's border cities to share the same daylight saving schedule as 2680# > the United States. 2681# Now this has passed both the Congress and the Senate, so starting from 2682# 2010, some border regions will be the same: 2683# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/ 2684# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939 2685# (Spanish) 2686# 2687# Could not find the new law text, but the proposed law text changes are here: 2688# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf 2689# (Gaceta Parlamentaria) 2690# 2691# There is also a list of the votes here: 2692# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html 2693# 2694# Our page: 2695# https://www.timeanddate.com/news/time/north-mexico-dst-change.html 2696 2697# From Arthur David Olson (2010-01-20): 2698# The page 2699# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2700# includes this text: 2701# En los municipios fronterizos de Tijuana y Mexicali en Baja California; 2702# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila; 2703# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en 2704# Tamaulipas, la aplicación de este horario estacional surtirá efecto 2705# desde las dos horas del segundo domingo de marzo y concluirá a las dos 2706# horas del primer domingo de noviembre. 2707# En los municipios fronterizos que se encuentren ubicados en la franja 2708# fronteriza norte en el territorio comprendido entre la línea 2709# internacional y la línea paralela ubicada a una distancia de veinte 2710# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el 2711# interior del país, la aplicación de este horario estacional surtirá 2712# efecto desde las dos horas del segundo domingo de marzo y concluirá a 2713# las dos horas del primer domingo de noviembre. 2714 2715# From Steffen Thorsen (2014-12-08), translated by Gwillim Law: 2716# The Mexican state of Quintana Roo will likely change to EST in 2015. 2717# 2718# http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo 2719# "With this change, the time conflict that has existed between the municipios 2720# of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an 2721# end. The latter declared itself in rebellion 15 years ago when a time change 2722# was initiated in Mexico, and since then it has refused to change its time 2723# zone along with the rest of the country." 2724# 2725# From Steffen Thorsen (2015-01-14), translated by Gwillim Law: 2726# http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html 2727# "...the new time zone will come into effect at two o'clock on the first Sunday 2728# of February, when we will have to advance the clock one hour from its current 2729# time..." 2730# Also, the new zone will not use DST. 2731# 2732# From Carlos Raúl Perasso (2015-02-02): 2733# The decree that modifies the Mexican Hour System Law has finally 2734# been published at the Diario Oficial de la Federación 2735# http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015 2736# It establishes 5 zones for Mexico: 2737# 1- Zona Centro (Central Zone): Corresponds to longitude 90 W, 2738# includes most of Mexico, excluding what's mentioned below. 2739# 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the 2740# states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía 2741# de Banderas which lies in Central Zone); Sinaloa and Sonora. 2742# 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the 2743# state of Baja California. 2744# 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state 2745# of Quintana Roo. 2746# 5- The islands, reefs and keys shall take their timezone from the 2747# longitude they are located at. 2748 2749# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2750Rule Mexico 1939 only - Feb 5 0:00 1:00 D 2751Rule Mexico 1939 only - Jun 25 0:00 0 S 2752Rule Mexico 1940 only - Dec 9 0:00 1:00 D 2753Rule Mexico 1941 only - Apr 1 0:00 0 S 2754Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 2755Rule Mexico 1944 only - May 1 0:00 0 S 2756Rule Mexico 1950 only - Feb 12 0:00 1:00 D 2757Rule Mexico 1950 only - Jul 30 0:00 0 S 2758Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 2759Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 2760Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 2761Rule Mexico 2001 only - Sep lastSun 2:00 0 S 2762Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 2763Rule Mexico 2002 max - Oct lastSun 2:00 0 S 2764# Zone NAME STDOFF RULES FORMAT [UNTIL] 2765# Quintana Roo; represented by Cancún 2766Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 2767 -6:00 - CST 1981 Dec 23 2768 -5:00 Mexico E%sT 1998 Aug 2 2:00 2769 -6:00 Mexico C%sT 2015 Feb 1 2:00 2770 -5:00 - EST 2771# Campeche, Yucatán; represented by Mérida 2772Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 2773 -6:00 - CST 1981 Dec 23 2774 -5:00 - EST 1982 Dec 2 2775 -6:00 Mexico C%sT 2776# Coahuila, Nuevo León, Tamaulipas (near US border) 2777# This includes the following municipalities: 2778# in Coahuila: Ocampo, Acuña, Zaragoza, Jiménez, Piedras Negras, Nava, 2779# Guerrero, Hidalgo. 2780# in Nuevo León: Anáhuac, Los Aldama. 2781# in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo, 2782# Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso, Matamoros. 2783# See: Inicia mañana Horario de Verano en zona fronteriza, El Universal, 2784# 2016-03-12 2785# http://www.eluniversal.com.mx/articulo/estados/2016/03/12/inicia-manana-horario-de-verano-en-zona-fronteriza 2786Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00 2787 -6:00 - CST 1988 2788 -6:00 US C%sT 1989 2789 -6:00 Mexico C%sT 2010 2790 -6:00 US C%sT 2791# Durango; Coahuila, Nuevo León, Tamaulipas (away from US border) 2792Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 2793 -6:00 - CST 1988 2794 -6:00 US C%sT 1989 2795 -6:00 Mexico C%sT 2796# Central Mexico 2797Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 2798 -7:00 - MST 1927 Jun 10 23:00 2799 -6:00 - CST 1930 Nov 15 2800 -7:00 - MST 1931 May 1 23:00 2801 -6:00 - CST 1931 Oct 2802 -7:00 - MST 1932 Apr 1 2803 -6:00 Mexico C%sT 2001 Sep 30 2:00 2804 -6:00 - CST 2002 Feb 20 2805 -6:00 Mexico C%sT 2806# Chihuahua (near US border) 2807# This includes the municipalities of Janos, Ascensión, Juárez, Guadalupe, 2808# Práxedis G Guerrero, Coyame del Sotol, Ojinaga, and Manuel Benavides. 2809# (See the 2016-03-12 El Universal source mentioned above.) 2810Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20 2811 -7:00 - MST 1927 Jun 10 23:00 2812 -6:00 - CST 1930 Nov 15 2813 -7:00 - MST 1931 May 1 23:00 2814 -6:00 - CST 1931 Oct 2815 -7:00 - MST 1932 Apr 1 2816 -6:00 - CST 1996 2817 -6:00 Mexico C%sT 1998 2818 -6:00 - CST 1998 Apr Sun>=1 3:00 2819 -7:00 Mexico M%sT 2010 2820 -7:00 US M%sT 2821# Chihuahua (away from US border) 2822Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 2823 -7:00 - MST 1927 Jun 10 23:00 2824 -6:00 - CST 1930 Nov 15 2825 -7:00 - MST 1931 May 1 23:00 2826 -6:00 - CST 1931 Oct 2827 -7:00 - MST 1932 Apr 1 2828 -6:00 - CST 1996 2829 -6:00 Mexico C%sT 1998 2830 -6:00 - CST 1998 Apr Sun>=1 3:00 2831 -7:00 Mexico M%sT 2832# Sonora 2833Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 2834 -7:00 - MST 1927 Jun 10 23:00 2835 -6:00 - CST 1930 Nov 15 2836 -7:00 - MST 1931 May 1 23:00 2837 -6:00 - CST 1931 Oct 2838 -7:00 - MST 1932 Apr 1 2839 -6:00 - CST 1942 Apr 24 2840 -7:00 - MST 1949 Jan 14 2841 -8:00 - PST 1970 2842 -7:00 Mexico M%sT 1999 2843 -7:00 - MST 2844 2845# From Alexander Krivenyshev (2010-04-21): 2846# According to news, Bahía de Banderas (Mexican state of Nayarit) 2847# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to 2848# share the same time zone as nearby city Puerto Vallarta, Jalisco). 2849# 2850# (Spanish) 2851# Bahía de Banderas homologa su horario al del centro del 2852# país, a partir de este domingo 2853# http://www.nayarit.gob.mx/notes.asp?id=20748 2854# 2855# Bahía de Banderas homologa su horario con el del Centro del 2856# País 2857# 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 2858# 2859# (English) 2860# Puerto Vallarta and Bahía de Banderas: One Time Zone 2861# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml 2862# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html 2863# 2864# "Mexico's Senate approved the amendments to the Mexican Schedule System that 2865# will allow Bahía de Banderas and Puerto Vallarta to share the same time 2866# zone ..." 2867# Baja California Sur, Nayarit, Sinaloa 2868 2869# From Arthur David Olson (2010-05-01): 2870# Use "Bahia_Banderas" to keep the name to fourteen characters. 2871 2872# Mazatlán 2873Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 2874 -7:00 - MST 1927 Jun 10 23:00 2875 -6:00 - CST 1930 Nov 15 2876 -7:00 - MST 1931 May 1 23:00 2877 -6:00 - CST 1931 Oct 2878 -7:00 - MST 1932 Apr 1 2879 -6:00 - CST 1942 Apr 24 2880 -7:00 - MST 1949 Jan 14 2881 -8:00 - PST 1970 2882 -7:00 Mexico M%sT 2883 2884# Bahía de Banderas 2885Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00 2886 -7:00 - MST 1927 Jun 10 23:00 2887 -6:00 - CST 1930 Nov 15 2888 -7:00 - MST 1931 May 1 23:00 2889 -6:00 - CST 1931 Oct 2890 -7:00 - MST 1932 Apr 1 2891 -6:00 - CST 1942 Apr 24 2892 -7:00 - MST 1949 Jan 14 2893 -8:00 - PST 1970 2894 -7:00 Mexico M%sT 2010 Apr 4 2:00 2895 -6:00 Mexico C%sT 2896 2897# Baja California 2898Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 2899 -7:00 - MST 1924 2900 -8:00 - PST 1927 Jun 10 23:00 2901 -7:00 - MST 1930 Nov 15 2902 -8:00 - PST 1931 Apr 1 2903 -8:00 1:00 PDT 1931 Sep 30 2904 -8:00 - PST 1942 Apr 24 2905 -8:00 1:00 PWT 1945 Aug 14 23:00u 2906 -8:00 1:00 PPT 1945 Nov 12 # Peace 2907 -8:00 - PST 1948 Apr 5 2908 -8:00 1:00 PDT 1949 Jan 14 2909 -8:00 - PST 1954 2910 -8:00 CA P%sT 1961 2911 -8:00 - PST 1976 2912 -8:00 US P%sT 1996 2913 -8:00 Mexico P%sT 2001 2914 -8:00 US P%sT 2002 Feb 20 2915 -8:00 Mexico P%sT 2010 2916 -8:00 US P%sT 2917# From Paul Eggert (2006-03-22): 2918# Formerly there was an America/Ensenada zone, which differed from 2919# America/Tijuana only in that it did not observe DST from 1976 2920# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say 2921# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports 2922# that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and 2923# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that 2924# DST-observance was a town-by-town matter back then. This concerns 2925# data after 1970 so most likely there should be at least one Zone 2926# other than America/Tijuana for Baja, but it's not clear yet what its 2927# name or contents should be. 2928# 2929# From Paul Eggert (2015-10-08): 2930# Formerly there was an America/Santa_Isabel zone, but this appears to 2931# have come from a misreading of 2932# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2933# It has been moved to the 'backward' file. 2934# 2935# 2936# Revillagigedo Is 2937# no information 2938 2939############################################################################### 2940 2941# Anguilla 2942# Antigua and Barbuda 2943# See America/Port_of_Spain. 2944 2945# Bahamas 2946# 2947# For 1899 Milne gives -5:09:29.5; round that. 2948# 2949# From Sue Williams (2006-12-07): 2950# The Bahamas announced about a month ago that they plan to change their DST 2951# rules to sync with the U.S. starting in 2007.... 2952# http://www.jonesbahamas.com/?c=45&a=10412 2953 2954# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2955Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S 2956Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D 2957# Zone NAME STDOFF RULES FORMAT [UNTIL] 2958Zone America/Nassau -5:09:30 - LMT 1912 Mar 2 2959 -5:00 Bahamas E%sT 1976 2960 -5:00 US E%sT 2961 2962# Barbados 2963 2964# For 1899 Milne gives -3:58:29.2; round that. 2965 2966# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2967Rule Barb 1977 only - Jun 12 2:00 1:00 D 2968Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 2969Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 2970Rule Barb 1979 only - Sep 30 2:00 0 S 2971Rule Barb 1980 only - Sep 25 2:00 0 S 2972# Zone NAME STDOFF RULES FORMAT [UNTIL] 2973Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown 2974 -3:58:29 - BMT 1932 # Bridgetown Mean Time 2975 -4:00 Barb A%sT 2976 2977# Belize 2978# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger. 2979# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2980Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 -0530 2981Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 CST 2982Rule Belize 1973 only - Dec 5 0:00 1:00 CDT 2983Rule Belize 1974 only - Feb 9 0:00 0 CST 2984Rule Belize 1982 only - Dec 18 0:00 1:00 CDT 2985Rule Belize 1983 only - Feb 12 0:00 0 CST 2986# Zone NAME STDOFF RULES FORMAT [UNTIL] 2987Zone America/Belize -5:52:48 - LMT 1912 Apr 2988 -6:00 Belize %s 2989 2990# Bermuda 2991 2992# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower, 2993# Bermuda dockyard, Ireland I; round that. 2994 2995# From Dan Jones, reporting in The Royal Gazette (2006-06-26): 2996 2997# Next year, however, clocks in the US will go forward on the second Sunday 2998# in March, until the first Sunday in November. And, after the Time Zone 2999# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on 3000# Friday, the same thing will happen in Bermuda. 3001# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135 3002 3003# Zone NAME STDOFF RULES FORMAT [UNTIL] 3004Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton 3005 -4:00 - AST 1974 Apr 28 2:00 3006 -4:00 Canada A%sT 1976 3007 -4:00 US A%sT 3008 3009# Cayman Is 3010# See America/Panama. 3011 3012# Costa Rica 3013 3014# Milne gives -5:36:13.3 as San José mean time; round to nearest. 3015 3016# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3017Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 3018Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 3019Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 3020# IATA SSIM (1991-09) says the following was at 1:00; 3021# go with Shanks & Pottenger. 3022Rule CR 1991 only - Jul 1 0:00 0 S 3023Rule CR 1992 only - Mar 15 0:00 0 S 3024# There are too many San Josés elsewhere, so we'll use 'Costa Rica'. 3025# Zone NAME STDOFF RULES FORMAT [UNTIL] 3026Zone America/Costa_Rica -5:36:13 - LMT 1890 # San José 3027 -5:36:13 - SJMT 1921 Jan 15 # San José Mean Time 3028 -6:00 CR C%sT 3029# Coco 3030# no information; probably like America/Costa_Rica 3031 3032# Cuba 3033 3034# From Paul Eggert (2013-02-21): 3035# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57 3036# for the port, and -5:30 for meteorological observations. 3037# For now, stick with Shanks & Pottenger. 3038 3039# From Arthur David Olson (1999-03-29): 3040# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 3041# the Cuban National Team and the Baltimore Orioles was carried live on 3042# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 3043# During the game, play-by-play announcer Jim Hunter noted that 3044# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 3045# Time today." (The "two hour" remark referred to losing one hour of 3046# sleep on 1999-03-28 - when the announcers were in Cuba as it switched 3047# to DST - and one more hour on 1999-04-04 - when the announcers will have 3048# returned to Baltimore, which switches on that date.) 3049 3050# From Steffen Thorsen (2013-11-11): 3051# DST start in Cuba in 2004 ... does not follow the same rules as the 3052# years before. The correct date should be Sunday 2004-03-28 00:00 ... 3053# https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html 3054 3055# From Evert van der Veer via Steffen Thorsen (2004-10-28): 3056# Cuba is not going back to standard time this year. 3057# From Paul Eggert (2006-03-22): 3058# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 3059# says that it's due to a problem at the Antonio Guiteras 3060# thermoelectric plant, and says "This October there will be no return 3061# to normal hours (after daylight saving time)". 3062# For now, let's assume that it's a temporary measure. 3063 3064# From Carlos A. Carnero Delgado (2005-11-12): 3065# This year (just like in 2004-2005) there's no change in time zone 3066# adjustment in Cuba. We will stay in daylight saving time: 3067# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html 3068 3069# From Jesper Nørgaard Welen (2006-10-21): 3070# An article in GRANMA INTERNACIONAL claims that Cuba will end 3071# the 3 years of permanent DST next weekend, see 3072# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html 3073# "On Saturday night, October 28 going into Sunday, October 29, at 01:00, 3074# watches should be set back one hour - going back to 00:00 hours - returning 3075# to the normal schedule.... 3076 3077# From Paul Eggert (2007-03-02): 3078# <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday, 3079# says Cuban clocks will advance at midnight on March 10. 3080# For lack of better information, assume Cuba will use US rules, 3081# except that it switches at midnight standard time as usual. 3082# 3083# From Steffen Thorsen (2007-10-25): 3084# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week 3085# earlier - on the last Sunday of October, just like in 2006. 3086# 3087# He supplied these references: 3088# 3089# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES 3090# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm 3091# 3092# From Alex Krivenyshev (2007-10-25): 3093# Here is also article from Granma (Cuba): 3094# 3095# Regirá el Horario Normal desde el próximo domingo 28 de octubre 3096# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html 3097# 3098# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html 3099 3100# From Arthur David Olson (2008-03-09): 3101# I'm in Maryland which is now observing United States Eastern Daylight 3102# Time. At 9:44 local time I used RealPlayer to listen to 3103# http://media.enet.cu/radioreloj 3104# a Cuban information station, and heard 3105# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"), 3106# indicating that Cuba is still on standard time. 3107 3108# From Steffen Thorsen (2008-03-12): 3109# It seems that Cuba will start DST on Sunday, 2007-03-16... 3110# It was announced yesterday, according to this source (in Spanish): 3111# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm 3112# 3113# Some more background information is posted here: 3114# https://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html 3115# 3116# The article also says that Cuba has been observing DST since 1963, 3117# while Shanks (and tzdata) has 1965 as the first date (except in the 3118# 1940's). Many other web pages in Cuba also claim that it has been 3119# observed since 1963, but with the exception of 1970 - an exception 3120# which is not present in tzdata/Shanks. So there is a chance we need to 3121# change some historic records as well. 3122# 3123# One example: 3124# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm 3125 3126# From Jesper Nørgaard Welen (2008-03-13): 3127# The Cuban time change has just been confirmed on the most authoritative 3128# web site, the Granma. Please check out 3129# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html 3130# 3131# Basically as expected after Steffen Thorsen's information, the change 3132# will take place midnight between Saturday and Sunday. 3133 3134# From Arthur David Olson (2008-03-12): 3135# Assume Sun>=15 (third Sunday) going forward. 3136 3137# From Alexander Krivenyshev (2009-03-04) 3138# According to the Radio Reloj - Cuba will start Daylight Saving Time on 3139# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009- 3140# not on midnight March 14 / March 15 as previously thought. 3141# 3142# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html 3143# (in Spanish) 3144 3145# From Arthur David Olson (2009-03-09) 3146# I listened over the Internet to 3147# http://media.enet.cu/readioreloj 3148# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the 3149# the time was announced as "diez cinco" - the same time as here, indicating 3150# that has indeed switched to DST. Assume second Sunday from 2009 forward. 3151 3152# From Steffen Thorsen (2011-03-08): 3153# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00 3154# this year. Nothing about the end date known so far (if that has 3155# changed at all). 3156# 3157# Source: 3158# http://granma.co.cu/2011/03/08/nacional/artic01.html 3159# 3160# Our info: 3161# https://www.timeanddate.com/news/time/cuba-starts-dst-2011.html 3162# 3163# From Steffen Thorsen (2011-10-30) 3164# Cuba will end DST two weeks later this year. Instead of going back 3165# tonight, it has been delayed to 2011-11-13 at 01:00. 3166# 3167# One source (Spanish) 3168# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html 3169# 3170# Our page: 3171# https://www.timeanddate.com/news/time/cuba-time-changes-2011.html 3172# 3173# From Steffen Thorsen (2012-03-01) 3174# According to Radio Reloj, Cuba will start DST on Midnight between March 3175# 31 and April 1. 3176# 3177# Radio Reloj has the following info (Spanish): 3178# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril 3179# 3180# Our info on it: 3181# https://www.timeanddate.com/news/time/cuba-starts-dst-2012.html 3182 3183# From Steffen Thorsen (2012-11-03): 3184# Radio Reloj and many other sources report that Cuba is changing back 3185# to standard time on 2012-11-04: 3186# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre 3187# From Paul Eggert (2012-11-03): 3188# For now, assume the future rule is first Sunday in November. 3189 3190# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3191Rule Cuba 1928 only - Jun 10 0:00 1:00 D 3192Rule Cuba 1928 only - Oct 10 0:00 0 S 3193Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 3194Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 3195Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 3196Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 3197Rule Cuba 1965 only - Jun 1 0:00 1:00 D 3198Rule Cuba 1965 only - Sep 30 0:00 0 S 3199Rule Cuba 1966 only - May 29 0:00 1:00 D 3200Rule Cuba 1966 only - Oct 2 0:00 0 S 3201Rule Cuba 1967 only - Apr 8 0:00 1:00 D 3202Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 3203Rule Cuba 1968 only - Apr 14 0:00 1:00 D 3204Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 3205Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 3206Rule Cuba 1972 1974 - Oct 8 0:00 0 S 3207Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 3208Rule Cuba 1978 only - May 7 0:00 1:00 D 3209Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 3210Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 3211Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 3212Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 3213Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 3214Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 3215Rule Cuba 1996 only - Oct 6 0:00s 0 S 3216Rule Cuba 1997 only - Oct 12 0:00s 0 S 3217Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 3218Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 3219Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D 3220Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D 3221Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S 3222Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D 3223Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D 3224Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D 3225Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D 3226Rule Cuba 2011 only - Nov 13 0:00s 0 S 3227Rule Cuba 2012 only - Apr 1 0:00s 1:00 D 3228Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S 3229Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D 3230 3231# Zone NAME STDOFF RULES FORMAT [UNTIL] 3232Zone America/Havana -5:29:28 - LMT 1890 3233 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 3234 -5:00 Cuba C%sT 3235 3236# Dominica 3237# See America/Port_of_Spain. 3238 3239# Dominican Republic 3240 3241# From Steffen Thorsen (2000-10-30): 3242# Enrique Morales reported to me that the Dominican Republic has changed the 3243# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 3244# http://www.listin.com.do/antes/261000/republica/princi.html 3245 3246# From Paul Eggert (2000-12-04): 3247# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 3248 3249# From Rives McDow (2000-12-01): 3250# Dominican Republic changed its mind and presidential decree on Tuesday, 3251# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 3252# Dominican Republic will be reverting to 8 hours from the International Date 3253# Line, and will not be using DST in the foreseeable future. The reason they 3254# decided to use DST was to be in synch with Puerto Rico, who was also going 3255# to implement DST. When Puerto Rico didn't implement DST, the president 3256# decided to revert. 3257 3258 3259# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3260Rule DR 1966 only - Oct 30 0:00 1:00 EDT 3261Rule DR 1967 only - Feb 28 0:00 0 EST 3262Rule DR 1969 1973 - Oct lastSun 0:00 0:30 -0430 3263Rule DR 1970 only - Feb 21 0:00 0 EST 3264Rule DR 1971 only - Jan 20 0:00 0 EST 3265Rule DR 1972 1974 - Jan 21 0:00 0 EST 3266# Zone NAME STDOFF RULES FORMAT [UNTIL] 3267Zone America/Santo_Domingo -4:39:36 - LMT 1890 3268 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 3269 -5:00 DR %s 1974 Oct 27 3270 -4:00 - AST 2000 Oct 29 2:00 3271 -5:00 US E%sT 2000 Dec 3 1:00 3272 -4:00 - AST 3273 3274# El Salvador 3275 3276# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3277Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 3278Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 3279# There are too many San Salvadors elsewhere, so use America/El_Salvador 3280# instead of America/San_Salvador. 3281# Zone NAME STDOFF RULES FORMAT [UNTIL] 3282Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 3283 -6:00 Salv C%sT 3284 3285# Grenada 3286# Guadeloupe 3287# St Barthélemy 3288# St Martin (French part) 3289# See America/Port_of_Spain. 3290 3291# Guatemala 3292# 3293# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen: 3294# Diario Co Latino, at 3295# <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>, 3296# says in an article dated 2006-04-19 that the Guatemalan government had 3297# decided on that date to advance official time by 60 minutes, to lessen the 3298# impact of the elevated cost of oil.... Daylight saving time will last from 3299# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified). 3300# From Paul Eggert (2006-06-22): 3301# The Ministry of Energy and Mines, press release CP-15/2006 3302# (2006-04-19), says DST ends at 24:00. See 3303# http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf 3304 3305# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3306Rule Guat 1973 only - Nov 25 0:00 1:00 D 3307Rule Guat 1974 only - Feb 24 0:00 0 S 3308Rule Guat 1983 only - May 21 0:00 1:00 D 3309Rule Guat 1983 only - Sep 22 0:00 0 S 3310Rule Guat 1991 only - Mar 23 0:00 1:00 D 3311Rule Guat 1991 only - Sep 7 0:00 0 S 3312Rule Guat 2006 only - Apr 30 0:00 1:00 D 3313Rule Guat 2006 only - Oct 1 0:00 0 S 3314# Zone NAME STDOFF RULES FORMAT [UNTIL] 3315Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 3316 -6:00 Guat C%sT 3317 3318# Haiti 3319# From Gwillim Law (2005-04-15): 3320# Risto O. Nykänen wrote me that Haiti is now on DST. 3321# I searched for confirmation, and I found a press release 3322# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 3323# <http://www.haitianconsulate.org/time.doc>. Translated from French, it says: 3324# 3325# "The Prime Minister's Communication Office notifies the public in general 3326# and the press in particular that, following a decision of the Interior 3327# Ministry and the Territorial Collectivities [I suppose that means the 3328# provinces], Haiti will move to Eastern Daylight Time in the night from next 3329# Saturday the 2nd to Sunday the 3rd. 3330# 3331# "Consequently, the Prime Minister's Communication Office wishes to inform 3332# the population that the country's clocks will be set forward one hour 3333# starting at midnight. This provision will hold until the last Saturday in 3334# October 2005. 3335# 3336# "Port-au-Prince, March 31, 2005" 3337# 3338# From Steffen Thorsen (2006-04-04): 3339# I have been informed by users that Haiti observes DST this year like 3340# last year, so the current "only" rule for 2005 might be changed to a 3341# "max" rule or to last until 2006. (Who knows if they will observe DST 3342# next year or if they will extend their DST like US/Canada next year). 3343# 3344# I have found this article about it (in French): 3345# http://www.haitipressnetwork.com/news.cfm?articleID=7612 3346# 3347# The reason seems to be an energy crisis. 3348 3349# From Stephen Colebourne (2007-02-22): 3350# Some IATA info: Haiti won't be having DST in 2007. 3351 3352# From Steffen Thorsen (2012-03-11): 3353# According to several news sources, Haiti will observe DST this year, 3354# apparently using the same start and end date as USA/Canada. 3355# So this means they have already changed their time. 3356# 3357# http://www.alterpresse.org/spip.php?article12510 3358# http://radiovision2000haiti.net/home/?p=13253 3359# 3360# From Arthur David Olson (2012-03-11): 3361# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to 3362# 3:00 a.m. rather than the traditional Haitian jump at midnight. 3363# Assume a US-style fall back as well. 3364 3365# From Steffen Thorsen (2013-03-10): 3366# It appears that Haiti is observing DST this year as well, same rules 3367# as US/Canada. They did it last year as well, and it looks like they 3368# are going to observe DST every year now... 3369# 3370# http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/ 3371# http://www.canalplushaiti.net/?p=6714 3372 3373# From Steffen Thorsen (2016-03-12): 3374# Jean Antoine, editor of www.haiti-reference.com informed us that Haiti 3375# are not going on DST this year. Several other resources confirm this: ... 3376# https://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html 3377# https://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/ 3378# http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/ 3379 3380# From Steffen Thorsen (2017-03-12): 3381# We have received 4 mails from different people telling that Haiti 3382# has started DST again today, and this source seems to confirm that, 3383# I have not been able to find a more authoritative source: 3384# https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html 3385 3386# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3387Rule Haiti 1983 only - May 8 0:00 1:00 D 3388Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 3389Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 3390# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. 3391# Go with IATA. 3392Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 3393Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 3394Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D 3395Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S 3396Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D 3397Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S 3398Rule Haiti 2017 max - Mar Sun>=8 2:00 1:00 D 3399Rule Haiti 2017 max - Nov Sun>=1 2:00 0 S 3400# Zone NAME STDOFF RULES FORMAT [UNTIL] 3401Zone America/Port-au-Prince -4:49:20 - LMT 1890 3402 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 3403 -5:00 Haiti E%sT 3404 3405# Honduras 3406# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1. 3407 3408# From Paul Eggert (2006-05-05): 3409# worldtimezone.com reports a 2006-05-02 Spanish-language AP article 3410# saying Honduras will start using DST midnight Saturday, effective 4 3411# months until September. La Tribuna reported today 3412# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president 3413# of Honduras, refused to back down on this. 3414 3415# From Jesper Nørgaard Welen (2006-08-08): 3416# It seems that Honduras has returned from DST to standard time this Monday at 3417# 00:00 hours (prolonging Sunday to 25 hours duration). 3418# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html 3419 3420# From Paul Eggert (2006-08-08): 3421# Also see Diario El Heraldo, The country returns to standard time (2006-08-08). 3422# http://www.elheraldo.hn/nota.php?nid=54941&sec=12 3423# It mentions executive decree 18-2006. 3424 3425# From Steffen Thorsen (2006-08-17): 3426# Honduras will observe DST from 2007 to 2009, exact dates are not 3427# published, I have located this authoritative source: 3428# http://www.presidencia.gob.hn/noticia.aspx?nId=47 3429 3430# From Steffen Thorsen (2007-03-30): 3431# http://www.laprensahn.com/pais_nota.php?id04962=7386 3432# So it seems that Honduras will not enter DST this year.... 3433 3434# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3435Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D 3436Rule Hond 1987 1988 - Sep lastSun 0:00 0 S 3437Rule Hond 2006 only - May Sun>=1 0:00 1:00 D 3438Rule Hond 2006 only - Aug Mon>=1 0:00 0 S 3439# Zone NAME STDOFF RULES FORMAT [UNTIL] 3440Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 3441 -6:00 Hond C%sT 3442# 3443# Great Swan I ceded by US to Honduras in 1972 3444 3445# Jamaica 3446# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an 3447# unspecified official document, and says "This time is used throughout the 3448# island". Go with Milne. Round to the nearest second as required by zic. 3449# 3450# Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but 3451# Lance Neita writes that Prime Minister Michael Manley decreed it January 5. 3452# Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that 3453# Manley's supporters associated this act with Manley's nickname "Joshua" 3454# (recall that in the Bible the sun stood still at Joshua's request), 3455# and with the Rod of Correction which Manley said he had received from 3456# Haile Selassie, Emperor of Ethiopia. See: 3457# Neita L. The politician in all of us. Jamaica Observer 2014-09-20 3458# http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647 3459# 3460# Zone NAME STDOFF RULES FORMAT [UNTIL] 3461Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston 3462 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3463 -5:00 - EST 1974 3464 -5:00 US E%sT 1984 3465 -5:00 - EST 3466 3467# Martinique 3468# Zone NAME STDOFF RULES FORMAT [UNTIL] 3469Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 3470 -4:04:20 - FFMT 1911 May # Fort-de-France MT 3471 -4:00 - AST 1980 Apr 6 3472 -4:00 1:00 ADT 1980 Sep 28 3473 -4:00 - AST 3474 3475# Montserrat 3476# See America/Port_of_Spain. 3477 3478# Nicaragua 3479# 3480# This uses Shanks & Pottenger for times before 2005. 3481# 3482# From Steffen Thorsen (2005-04-12): 3483# I've got reports from 8 different people that Nicaragua just started 3484# DST on Sunday 2005-04-10, in order to save energy because of 3485# expensive petroleum. The exact end date for DST is not yet 3486# announced, only "September" but some sites also say "mid-September". 3487# Some background information is available on the President's official site: 3488# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 3489# The Decree, no 23-2005 is available here: 3490# 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 3491# 3492# From Paul Eggert (2005-05-01): 3493# The decree doesn't say anything about daylight saving, but for now let's 3494# assume that it is daylight saving.... 3495# 3496# From Gwillim Law (2005-04-21): 3497# The Associated Press story on the time change, which can be found at 3498# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 3499# and elsewhere, says (fifth paragraph, translated from Spanish): "The last 3500# time that a change of clocks was applied to save energy was in the year 2000 3501# during the Arnoldo Alemán administration."... 3502# The northamerica file says that Nicaragua has been on UTC-6 continuously 3503# since December 1998. I wasn't able to find any details of Nicaraguan time 3504# changes in 2000. Perhaps a note could be added to the northamerica file, to 3505# the effect that we have indirect evidence that DST was observed in 2000. 3506# 3507# From Jesper Nørgaard Welen (2005-11-02): 3508# Nicaragua left DST the 2005-10-02 at 00:00 (local time). 3509# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm 3510# (2005-09-26) 3511# 3512# From Jesper Nørgaard Welen (2006-05-05): 3513# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410 3514# (my informal translation) 3515# By order of the president of the republic, Enrique Bolaños, Nicaragua 3516# advanced by sixty minutes their official time, yesterday at 2 in the 3517# morning, and will stay that way until 30th of September. 3518# 3519# From Jesper Nørgaard Welen (2006-09-30): 3520# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf 3521# My informal translation runs: 3522# The natural sun time is restored in all the national territory, in that the 3523# time is returned one hour at 01:00 am of October 1 of 2006. 3524# 3525# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3526Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 3527Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 3528Rule Nic 2005 only - Apr 10 0:00 1:00 D 3529Rule Nic 2005 only - Oct Sun>=1 0:00 0 S 3530Rule Nic 2006 only - Apr 30 2:00 1:00 D 3531Rule Nic 2006 only - Oct Sun>=1 1:00 0 S 3532# Zone NAME STDOFF RULES FORMAT [UNTIL] 3533Zone America/Managua -5:45:08 - LMT 1890 3534 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 3535 -6:00 - CST 1973 May 3536 -5:00 - EST 1975 Feb 16 3537 -6:00 Nic C%sT 1992 Jan 1 4:00 3538 -5:00 - EST 1992 Sep 24 3539 -6:00 - CST 1993 3540 -5:00 - EST 1997 3541 -6:00 Nic C%sT 3542 3543# Panama 3544# Zone NAME STDOFF RULES FORMAT [UNTIL] 3545Zone America/Panama -5:18:08 - LMT 1890 3546 -5:19:36 - CMT 1908 Apr 22 # Colón Mean Time 3547 -5:00 - EST 3548Link America/Panama America/Cayman 3549 3550# Puerto Rico 3551# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'. 3552# Zone NAME STDOFF RULES FORMAT [UNTIL] 3553Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 3554 -4:00 - AST 1942 May 3 3555 -4:00 US A%sT 1946 3556 -4:00 - AST 3557 3558# St Kitts-Nevis 3559# St Lucia 3560# See America/Port_of_Spain. 3561 3562# St Pierre and Miquelon 3563# There are too many St Pierres elsewhere, so we'll use 'Miquelon'. 3564# Zone NAME STDOFF RULES FORMAT [UNTIL] 3565Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 3566 -4:00 - AST 1980 May 3567 -3:00 - -03 1987 3568 -3:00 Canada -03/-02 3569 3570# St Vincent and the Grenadines 3571# See America/Port_of_Spain. 3572 3573# Turks and Caicos 3574# 3575# From Chris Dunn in 3576# https://bugs.debian.org/415007 3577# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the 3578# daylight saving dates for time changes have been adjusted to match 3579# the recent U.S. change of dates. 3580# 3581# From Brian Inglis (2007-04-28): 3582# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26] 3583# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three 3584# rows before that there is an out of date entry for Oct: 3585# "Eastern Standard Times Begins 2007 3586# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time" 3587# indicating that the normal ET rules are followed. 3588# 3589# From Paul Eggert (2014-08-19): 3590# The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See: 3591# http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm 3592# Model this as a switch from EST/EDT to AST ... 3593# From Chris Walton (2014-11-04): 3594# ... the TCI government appears to have delayed the switch to 3595# "permanent daylight saving time" by one year.... 3596# http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm 3597# 3598# From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen: 3599# ... agreed to the reintroduction in TCI of Daylight Saving Time (DST) 3600# during the summer months and Standard Time, also known as Local 3601# Time, during the winter months with effect from April 2018 ... 3602# https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3 3603# 3604# From Paul Eggert (2017-08-26): 3605# The date of effect of the spring 2018 change appears to be March 11, 3606# which makes more sense. See: Hamilton D. Time change back 3607# by March 2018 for TCI. Magnetic Media. 2017-08-25. 3608# http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/ 3609# 3610# Zone NAME STDOFF RULES FORMAT [UNTIL] 3611Zone America/Grand_Turk -4:44:32 - LMT 1890 3612 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3613 -5:00 - EST 1979 3614 -5:00 US E%sT 2015 Nov Sun>=1 2:00 3615 -4:00 - AST 2018 Mar 11 3:00 3616 -5:00 US E%sT 3617 3618# British Virgin Is 3619# Virgin Is 3620# See America/Port_of_Spain. 3621 3622 3623# Local Variables: 3624# coding: utf-8 3625# End: 3626