1# tzdb data for North and Central America and environs 2 3# This file is in the public domain, so clarified as of 4# 2009-05-17 by Arthur David Olson. 5 6# also includes Central America and the Caribbean 7 8# This file is by no means authoritative; if you think you know better, 9# go ahead and edit the file (and please send any changes to 10# tz@iana.org for general use in the future). For more, please see 11# the file CONTRIBUTING in the tz distribution. 12 13# From Paul Eggert (1999-03-22): 14# A reliable and entertaining source about time zones is 15# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 16 17############################################################################### 18 19# United States 20 21# From Paul Eggert (1999-03-31): 22# Howse writes (pp 121-125) that time zones were invented by 23# Professor Charles Ferdinand Dowd (1825-1904), 24# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 25# His pamphlet "A System of National Time for Railroads" (1870) 26# was the result of his proposals at the Convention of Railroad Trunk Lines 27# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 28# but in 1872-05 he moved the proposed origin to Greenwich. 29 30# From Paul Eggert (2018-03-20): 31# Dowd's proposal left many details unresolved, such as where to draw 32# lines between time zones. The key individual who made time zones 33# work in the US was William Frederick Allen - railway engineer, 34# managing editor of the Travelers' Guide, and secretary of the 35# General Time Convention, a railway standardization group. Allen 36# spent months in dialogs with scientific and railway leaders, 37# developed a workable plan to institute time zones, and presented it 38# to the General Time Convention on 1883-04-11, saying that his plan 39# meant "local time would be practically abolished" - a plus for 40# railway scheduling. By the next convention on 1883-10-11 nearly all 41# railroads had agreed and it took effect on 1883-11-18. That Sunday 42# was called the "day of two noons", as some locations observed noon 43# twice. Allen witnessed the transition in New York City, writing: 44# 45# I heard the bells of St. Paul's strike on the old time. Four 46# minutes later, obedient to the electrical signal from the Naval 47# Observatory ... the time-ball made its rapid descent, the chimes 48# of old Trinity rang twelve measured strokes, and local time was 49# abandoned, probably forever. 50# 51# Most of the US soon followed suit. See: 52# Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56. 53# https://dx.doi.org/10.2307/3105430 54 55# From Paul Eggert (2005-04-16): 56# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 57# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 58 59# From Paul Eggert (2006-03-22): 60# A good source for time zone historical data in the US is 61# Thomas G. Shanks, The American Atlas (5th edition), 62# San Diego: ACS Publications, Inc. (1991). 63# Make sure you have the errata sheet; the book is somewhat useless without it. 64# It is the source for most of the pre-1991 US entries below. 65 66# From Paul Eggert (2001-03-06): 67# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 68# in his whimsical essay "An Economical Project for Diminishing the Cost 69# of Light" published in the Journal de Paris (1784-04-26). 70# Not everyone is happy with the results: 71# 72# I don't really care how time is reckoned so long as there is some 73# agreement about it, but I object to being told that I am saving 74# daylight when my reason tells me that I am doing nothing of the kind. 75# I even object to the implication that I am wasting something 76# valuable if I stay in bed after the sun has risen. As an admirer 77# of moonlight I resent the bossy insistence of those who want to 78# reduce my time for enjoying it. At the back of the Daylight Saving 79# scheme I detect the bony, blue-fingered hand of Puritanism, eager 80# to push people into bed earlier, and get them up earlier, to make 81# them healthy, wealthy and wise in spite of themselves. 82# 83# -- Robertson Davies, The diary of Samuel Marchbanks, 84# Clarke, Irwin (1947), XIX, Sunday 85# 86# For more about the first ten years of DST in the United States, see 87# Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint 88# (Carnegie Library of Pittsburgh, 1927). 89# http://www.clpgh.org/exhibit/dst.html 90# 91# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 92# However, DST was imposed by the Standard Time Act of 1918, which 93# was the first nationwide legal time standard, and apparently 94# time was just called "Standard Time" or "Daylight Saving Time". 95 96# From Arthur David Olson: 97# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 98# See, for example, the front page of the Saturday, 1974-10-26 99# and Sunday, 1974-10-27 editions of the Washington Post. 100 101# From Arthur David Olson: 102# Before the Uniform Time Act of 1966 took effect in 1967, observance of 103# Daylight Saving Time in the US was by local option, except during wartime. 104 105# From Arthur David Olson (2000-09-25): 106# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 107# In the introduction, Oboler spoke of "Eastern Peace Time." 108# An AltaVista search turned up: 109# https://web.archive.org/web/20000926032210/http://rowayton.org/rhs/hstaug45.html 110# "When the time is announced over the radio now, it is 'Eastern Peace 111# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 112# (August 1945) by way of confirmation. 113# 114# From Paul Eggert (2017-09-23): 115# This was the V-J Day issue of the Clamdigger, a Rowayton, CT newsletter. 116 117# From Joseph Gallant citing 118# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 119# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 120# to switch to London for Attlee's address, but the American people 121# never got to hear his speech live. According to one press account, 122# CBS' Bob Trout was first to announce the word of Japan's surrender, 123# but a few seconds later, NBC, ABC and Mutual also flashed the word 124# of surrender, all of whom interrupting the bells of Big Ben in 125# London which were to precede Mr. Attlee's speech. 126 127# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 128# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 129# 130# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 131# Any announcement from Asia would reach St. John's New York newsroom on a 132# wire service teletype machine, which had prescribed signals for major news. 133# Associated Press, for example, would ring five bells before spewing out 134# typed copy of an important story, and 10 bells for news "of transcendental 135# importance." 136# 137# On Aug. 14, stalling while talking steadily into the NBC networks' open 138# microphone, St. John heard five bells and waited only to hear a sixth bell, 139# before announcing confidently: "Ladies and gentlemen, World War II is over. 140# The Japanese have agreed to our surrender terms." 141# 142# He had scored a 20-second scoop on other broadcasters. 143 144# From Arthur David Olson (2005-08-22): 145# Paul has been careful to use the "US" rules only in those locations 146# that are part of the United States; this reflects the real scope of 147# U.S. government action. So even though the "US" rules have changed 148# in the latest release, other countries won't be affected. 149 150# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 151Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 152Rule US 1918 1919 - Oct lastSun 2:00 0 S 153Rule US 1942 only - Feb 9 2:00 1:00 W # War 154Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 155Rule US 1945 only - Sep lastSun 2:00 0 S 156Rule US 1967 2006 - Oct lastSun 2:00 0 S 157Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 158Rule US 1974 only - Jan 6 2:00 1:00 D 159Rule US 1975 only - Feb 23 2:00 1:00 D 160Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 161Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 162Rule US 2007 max - Mar Sun>=8 2:00 1:00 D 163Rule US 2007 max - Nov Sun>=1 2:00 0 S 164 165# From Arthur David Olson, 2005-12-19 166# We generate the files specified below to guard against old files with 167# obsolete information being left in the time zone binary directory. 168# We limit the list to names that have appeared in previous versions of 169# this time zone package. 170# We do these as separate Zones rather than as Links to avoid problems if 171# a particular place changes whether it observes DST. 172# We put these specifications here in the northamerica file both to 173# increase the chances that they'll actually get compiled and to 174# avoid the need to duplicate the US rules in another file. 175 176# Zone NAME GMTOFF RULES FORMAT [UNTIL] 177Zone EST -5:00 - EST 178Zone MST -7:00 - MST 179Zone HST -10:00 - HST 180Zone EST5EDT -5:00 US E%sT 181Zone CST6CDT -6:00 US C%sT 182Zone MST7MDT -7:00 US M%sT 183Zone PST8PDT -8:00 US P%sT 184 185# From U. S. Naval Observatory (1989-01-19): 186# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 187# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 188# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 189# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 190# USA MOUNTAIN 7 H BEHIND UTC DENVER 191# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 192# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 193# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 194# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 195# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 196# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 197# USA " 9 H BEHIND UTC APR 3 - OCT 30 198# USA HAWAII 10 H BEHIND UTC 199# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 200 201# From Arthur David Olson (1989-01-21): 202# The above dates are for 1988. 203# Note the "AKST" and "AKDT" abbreviations, the claim that there's 204# no DST in Samoa, and the claim that there is DST in Alaska and the 205# Aleutians. 206 207# From Arthur David Olson (1988-02-13): 208# Legal standard time zone names, from United States Code (1982 Edition and 209# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 210# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 211# took effect), as explained in sections 263 and 261: 212# (none) 213# United States standard eastern time 214# United States standard mountain time 215# United States standard central time 216# United States standard Pacific time 217# (none) 218# United States standard Alaska time 219# (none) 220# Next, names from 1967-04-01 until 1983-11-30 (the date for 221# public law 98-181): 222# Atlantic standard time 223# eastern standard time 224# central standard time 225# mountain standard time 226# Pacific standard time 227# Yukon standard time 228# Alaska-Hawaii standard time 229# Bering standard time 230# And after 1983-11-30: 231# Atlantic standard time 232# eastern standard time 233# central standard time 234# mountain standard time 235# Pacific standard time 236# Alaska standard time 237# Hawaii-Aleutian standard time 238# Samoa standard time 239# The law doesn't give abbreviations. 240# 241# From Paul Eggert (2016-12-19): 242# Here are URLs for the 1918 and 1966 legislation: 243# http://uscode.house.gov/statviewer.htm?volume=40&page=451 244# http://uscode.house.gov/statviewer.htm?volume=80&page=108 245# Although the 1918 names were officially "United States Standard 246# Eastern Time" and similarly for "Central", "Mountain", "Pacific", 247# and "Alaska", in practice "Standard" was placed just before "Time", 248# as codified in 1966. In practice, Alaska time was abbreviated "AST" 249# before 1968. Summarizing the 1967 name changes: 250# 1918 names 1967 names 251# -08 Standard Pacific Time (PST) Pacific standard time (PST) 252# -09 (unofficial) Yukon (YST) Yukon standard time (YST) 253# -10 Standard Alaska Time (AST) Alaska-Hawaii standard time (AHST) 254# -11 (unofficial) Nome (NST) Bering standard time (BST) 255# 256# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 257# Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time" 258# for time in Guam and the Northern Marianas. See the file "australasia". 259# 260# From Paul Eggert (2015-04-17): 261# HST and HDT are standardized abbreviations for Hawaii-Aleutian 262# standard and daylight times. See section 9.47 (p 234) of the 263# U.S. Government Printing Office Style Manual (2008) 264# https://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf 265 266# From Arthur David Olson, 2005-08-09 267# The following was signed into law on 2005-08-08. 268# 269# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 270# (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15 271# U.S.C. 260a(a)) is amended-- 272# (1) by striking "first Sunday of April" and inserting "second 273# Sunday of March"; and 274# (2) by striking "last Sunday of October" and inserting "first 275# Sunday of November'. 276# (b) Effective Date.--Subsection (a) shall take effect 1 year after the 277# date of enactment of this Act or March 1, 2007, whichever is later. 278# (c) Report to Congress.--Not later than 9 months after the effective 279# date stated in subsection (b), the Secretary shall report to Congress 280# on the impact of this section on energy consumption in the United 281# States. 282# (d) Right to Revert.--Congress retains the right to revert the 283# Daylight Saving Time back to the 2005 time schedules once the 284# Department study is complete. 285 286# US eastern time, represented by New York 287 288# Connecticut, Delaware, District of Columbia, most of Florida, 289# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky 290# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, 291# New Hampshire, New Jersey, New York, North Carolina, Ohio, 292# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 293# Vermont, Virginia, West Virginia 294 295# From Dave Cantor (2004-11-02): 296# Early this summer I had the occasion to visit the Mount Washington 297# Observatory weather station atop (of course!) Mount Washington [, NH].... 298# One of the staff members said that the station was on Eastern Standard Time 299# and didn't change their clocks for Daylight Saving ... so that their 300# reports will always have times which are 5 hours behind UTC. 301 302# From Paul Eggert (2005-08-26): 303# According to today's Huntsville Times 304# http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1 305# a few towns on Alabama's "eastern border with Georgia, such as Phenix City 306# in Russell County, Lanett in Chambers County and some towns in Lee County, 307# set their watches and clocks on Eastern time." It quotes H.H. "Bubba" 308# Roberts, city administrator in Phenix City. as saying "We are in the Central 309# time zone, but we do go by the Eastern time zone because so many people work 310# in Columbus." 311# 312# From Paul Eggert (2017-02-22): 313# Four cities are involved. The two not mentioned above are Smiths Station 314# and Valley. Barbara Brooks, Valley's assistant treasurer, heard it started 315# because West Point Pepperell textile mills were in Alabama while the 316# corporate office was in Georgia, and residents voted to keep Eastern 317# time even after the mills closed. See: Kazek K. Did you know which 318# Alabama towns are in a different time zone? al.com 2017-02-06. 319# http://www.al.com/living/index.ssf/2017/02/do_you_know_which_alabama_town.html 320 321# From Paul Eggert (2014-09-06): 322# Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208 323# says that New York City Hall time was 3 minutes 58.4 seconds fast of 324# Eastern time (i.e., -4:56:01.6) just before the 1883 switch. Round to the 325# nearest second. 326 327# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 328Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 329Rule NYC 1920 only - Oct lastSun 2:00 0 S 330Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 331Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 332Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 333# Zone NAME GMTOFF RULES FORMAT [UNTIL] 334Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 335 -5:00 US E%sT 1920 336 -5:00 NYC E%sT 1942 337 -5:00 US E%sT 1946 338 -5:00 NYC E%sT 1967 339 -5:00 US E%sT 340 341# US central time, represented by Chicago 342 343# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 344# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 345# Washington counties), Illinois, western Indiana 346# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 347# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 348# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 349# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 350# western Tennessee, most of Texas, Wisconsin 351 352# From Paul Eggert (2018-01-07): 353# In 1869 the Chicago Astronomical Society contracted with the city to keep 354# time. Though delayed by the Great Fire, by 1880 a wire ran from the 355# Dearborn Observatory (on the University of Chicago campus) to City Hall, 356# which then sent signals to police and fire stations. However, railroads got 357# their time signals from the Allegheny Observatory, the Madison Observatory, 358# the Ann Arbor Observatory, etc., so their clocks did not agree with each 359# other or with the city's official time. The confusion took some years to 360# clear up. See: 361# Moser M. How Chicago gave America its time zones. Chicago. 2018-01-04. 362# http://www.chicagomag.com/city-life/January-2018/How-Chicago-Gave-America-Its-Time-Zones/ 363 364# From Larry M. Smith (2006-04-26) re Wisconsin: 365# https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf 366# is currently enforced at the 01:00 time of change. Because the local 367# "bar time" in the state corresponds to 02:00, a number of citations 368# are issued for the "sale of class 'B' alcohol after prohibited 369# hours" within the deviated hour of this change every year.... 370# 371# From Douglas R. Bomberg (2007-03-12): 372# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI 373# Statue 175 closer in synch with the US Congress' intent.... 374# https://docs.legis.wisconsin.gov/2007/related/acts/3 375 376# From an email administrator of the City of Fort Pierre, SD (2015-12-21): 377# Fort Pierre is technically located in the Mountain time zone as is 378# the rest of Stanley County. Most of Stanley County and Fort Pierre 379# uses the Central time zone due to doing most of their business in 380# Pierre so it simplifies schedules. I have lived in Stanley County 381# all my life and it has been that way since I can remember. (43 years!) 382# 383# From Paul Eggert (2015-12-25): 384# Assume this practice predates 1970, so Fort Pierre can use America/Chicago. 385 386# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 387Rule Chicago 1920 only - Jun 13 2:00 1:00 D 388Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 389Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 390Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 391Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 392Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 393# Zone NAME GMTOFF RULES FORMAT [UNTIL] 394Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 395 -6:00 US C%sT 1920 396 -6:00 Chicago C%sT 1936 Mar 1 2:00 397 -5:00 - EST 1936 Nov 15 2:00 398 -6:00 Chicago C%sT 1942 399 -6:00 US C%sT 1946 400 -6:00 Chicago C%sT 1967 401 -6:00 US C%sT 402# Oliver County, ND switched from mountain to central time on 1992-10-25. 403Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 404 -7:00 US M%sT 1992 Oct 25 2:00 405 -6:00 US C%sT 406# Morton County, ND, switched from mountain to central time on 407# 2003-10-26, except for the area around Mandan which was already central time. 408# See <http://dmses.dot.gov/docimages/p63/135818.pdf>. 409# Officially this switch also included part of Sioux County, and 410# Jones, Mellette, and Todd Counties in South Dakota; 411# but in practice these other counties were already observing central time. 412# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>. 413Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21 414 -7:00 US M%sT 2003 Oct 26 2:00 415 -6:00 US C%sT 416 417# From Josh Findley (2011-01-21): 418# ...it appears that Mercer County, North Dakota, changed from the 419# mountain time zone to the central time zone at the last transition from 420# daylight-saving to standard time (on Nov. 7, 2010): 421# https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm 422# http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html 423 424# From Andy Lipscomb (2011-01-24): 425# ...according to the Census Bureau, the largest city is Beulah (although 426# it's commonly referred to as Beulah-Hazen, with Hazen being the next 427# largest city in Mercer County). Google Maps places Beulah's city hall 428# at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07". 429 430Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53 431 -7:00 US M%sT 2010 Nov 7 2:00 432 -6:00 US C%sT 433 434# US mountain time, represented by Denver 435# 436# Colorado, far western Kansas, Montana, western 437# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 438# New Mexico, southwestern North Dakota, 439# western South Dakota, far western Texas (El Paso County, Hudspeth County, 440# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 441# 442# From Paul Eggert (2018-10-25): 443# On 1921-03-04 federal law placed all of Texas into the central time zone. 444# However, El Paso ignored the law for decades and continued to observe 445# mountain time, on the grounds that that's what they had always done 446# and they weren't about to let the federal government tell them what to do. 447# Eventually the federal government gave in and changed the law on 448# 1970-04-10 to match what El Paso was actually doing. Although 449# that's slightly after our 1970 cutoff, there is no need to create a 450# separate zone for El Paso since they were ignoring the law anyway. See: 451# Long T. El Pasoans were time rebels, fought to stay in Mountain zone. 452# El Paso Times. 2018-10-24 06:40 -06. 453# https://www.elpasotimes.com/story/news/local/el-paso/2018/10/24/el-pasoans-were-time-rebels-fought-stay-mountain-zone/1744509002/ 454# 455# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 456Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 457Rule Denver 1920 only - Oct lastSun 2:00 0 S 458Rule Denver 1921 only - May 22 2:00 0 S 459Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 460Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 461# Zone NAME GMTOFF RULES FORMAT [UNTIL] 462Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 463 -7:00 US M%sT 1920 464 -7:00 Denver M%sT 1942 465 -7:00 US M%sT 1946 466 -7:00 Denver M%sT 1967 467 -7:00 US M%sT 468 469# US Pacific time, represented by Los Angeles 470# 471# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 472# Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county 473# north of the Salmon River, and the towns of Burgdorf and Warren), 474# Nevada (except West Wendover), Oregon (except the northern ¾ of 475# Malheur county), and Washington 476 477# From Paul Eggert (2016-08-20): 478# In early February 1948, in response to California's electricity shortage, 479# PG&E changed power frequency from 60 to 59.5 Hz during daylight hours, 480# causing electric clocks to lose six minutes per day. (This did not change 481# legal time, and is not part of the data here.) See: 482# Ross SA. An energy crisis from the past: Northern California in 1948. 483# Working Paper No. 8, Institute of Governmental Studies, UC Berkeley, 484# 1973-11. https://escholarship.org/uc/item/8x22k30c 485# 486# In another measure to save electricity, DST was instituted from 1948-03-14 487# at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move 488# the fallback transition earlier. See pages 3-4 of: 489# http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf 490# 491# In response: 492# 493# Governor Warren received a torrent of objecting mail, and it is not too much 494# to speculate that the objections to Daylight Saving Time were one important 495# factor in the defeat of the Dewey-Warren Presidential ticket in California. 496# -- Ross, p 25 497# 498# On December 8 the governor exercised the option, setting the date to January 1 499# (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01). 500# 501# Despite the controversy, in 1949 California voters approved Proposition 12, 502# which established DST from April's last Sunday at 01:00 until September's 503# last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed 504# the fall-back date to October's last Sunday. See: 505# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props 506# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props 507# 508# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 509Rule CA 1948 only - Mar 14 2:01 1:00 D 510Rule CA 1949 only - Jan 1 2:00 0 S 511Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D 512Rule CA 1950 1961 - Sep lastSun 2:00 0 S 513Rule CA 1962 1966 - Oct lastSun 2:00 0 S 514# Zone NAME GMTOFF RULES FORMAT [UNTIL] 515Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 516 -8:00 US P%sT 1946 517 -8:00 CA P%sT 1967 518 -8:00 US P%sT 519 520# Alaska 521# AK%sT is the modern abbreviation for -09 per USNO. 522# 523# From Paul Eggert (2017-06-15): 524# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 525# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 526# On Friday, 1867-10-18 (Gregorian), at precisely 15:30 local time, the 527# Russian forts and fleet at Sitka fired salutes to mark the ceremony of 528# formal transfer. See the Sacramento Daily Union (1867-11-14), p 3, col 2. 529# https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SDU18671114.2.12.1 530# Sitka workers did not change their calendars until Sunday, 1867-10-20, 531# and so celebrated two Sundays that week. See: Ahllund T (tr Hallamaa P). 532# From the memoirs of a Finnish workman. Alaska History. 2006 Fall;21(2):1-25. 533# http://alaskahistoricalsociety.org/wp-content/uploads/2016/12/Ahllund-2006-Memoirs-of-a-Finnish-Workman.pdf 534# Include only the time zone part of this transition, ignoring the switch 535# from Julian to Gregorian, since we can't represent the Julian calendar. 536# 537# As far as we know, of the locations mentioned below only Sitka was 538# permanently inhabited in 1867 by anyone using either calendar. 539# (Yakutat was colonized by the Russians in 1799, but the settlement was 540# destroyed in 1805 by a Yakutat-kon war party.) Many of Alaska's inhabitants 541# were unaware of the US acquisition of Alaska, much less of any calendar or 542# time change. However, the Russian-influenced part of Alaska did observe 543# Russian time, and it is more accurate to model this than to ignore it. 544# The database format requires an exact transition time; use the Russian 545# salute as a somewhat-arbitrary time for the formal transfer of control for 546# all of Alaska. Sitka's UTC offset is -9:01:13; adjust its 15:30 to the 547# local times of other Alaskan locations so that they change simultaneously. 548 549# From Paul Eggert (2014-07-18): 550# One opinion of the early-1980s turmoil in Alaska over time zones and 551# daylight saving time appeared as graffiti on a Juneau airport wall: 552# "Welcome to Juneau. Please turn your watch back to the 19th century." 553# See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01. 554# http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html 555# 556# Steve Ferguson (2011-01-31) referred to the following source: 557# Norris F. Keeping time in Alaska: national directives, local response. 558# Alaska History 2001;16(1-2). 559# http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/ 560 561# From Arthur David Olson (2011-02-01): 562# Here's database-relevant material from the 2001 "Alaska History" article: 563# 564# On September 20 [1979]...DOT...officials decreed that on April 27, 565# 1980, Juneau and other nearby communities would move to Yukon Time. 566# Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on 567# Pacific Time. 568# 569# ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the 570# Department's September 1979 decision. Juneau and other communities in 571# northern Southeast reverted to Pacific Time on October 26. 572# 573# On October 28 [1983]...the Metlakatla Indian Community Council voted 574# unanimously to keep the reservation on Pacific Time. 575# 576# According to DOT official Joanne Petrie, Indian reservations are not 577# bound to follow time zones imposed by neighboring jurisdictions. 578# 579# (The last is consistent with how the database now handles the Navajo 580# Nation.) 581 582# From Arthur David Olson (2011-02-09): 583# I just spoke by phone with a staff member at the Metlakatla Indian 584# Community office (using contact information available at 585# http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla 586# It's shortly after 1:00 here on the east coast of the United States; 587# the staffer said it was shortly after 10:00 there. When I asked whether 588# that meant they were on Pacific time, they said no - they were on their 589# own time. I asked about daylight saving; they said it wasn't used. I 590# did not inquire about practices in the past. 591 592# From Arthur David Olson (2011-08-17): 593# For lack of better information, assume that Metlakatla's 594# abandonment of use of daylight saving resulted from the 1983 vote. 595 596# From Steffen Thorsen (2015-11-09): 597# It seems Metlakatla did go off PST on Sunday, November 1, changing 598# their time to AKST and are going to follow Alaska's DST, switching 599# between AKST and AKDT from now on.... 600# https://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/ 601 602# From Ryan Stanley (2018-11-06): 603# The Metlakatla community in Alaska has decided not to change its 604# clock back an hour starting on November 4th, 2018 (day before yesterday). 605# They will be gmtoff=-28800 year-round. 606# https://www.facebook.com/141055983004923/photos/pb.141055983004923.-2207520000.1541465673./569081370202380/ 607 608# From Paul Eggert (2018-12-16): 609# In a 2018-12-11 special election, Metlakatla voted to go back to 610# Alaska time (including daylight saving time) starting next year. 611# https://www.krbd.org/2018/12/12/metlakatla-to-follow-alaska-standard-time-allow-liquor-sales/ 612 613# Zone NAME GMTOFF RULES FORMAT [UNTIL] 614Zone America/Juneau 15:02:19 - LMT 1867 Oct 19 15:33:32 615 -8:57:41 - LMT 1900 Aug 20 12:00 616 -8:00 - PST 1942 617 -8:00 US P%sT 1946 618 -8:00 - PST 1969 619 -8:00 US P%sT 1980 Apr 27 2:00 620 -9:00 US Y%sT 1980 Oct 26 2:00 621 -8:00 US P%sT 1983 Oct 30 2:00 622 -9:00 US Y%sT 1983 Nov 30 623 -9:00 US AK%sT 624Zone America/Sitka 14:58:47 - LMT 1867 Oct 19 15:30 625 -9:01:13 - LMT 1900 Aug 20 12:00 626 -8:00 - PST 1942 627 -8:00 US P%sT 1946 628 -8:00 - PST 1969 629 -8:00 US P%sT 1983 Oct 30 2:00 630 -9:00 US Y%sT 1983 Nov 30 631 -9:00 US AK%sT 632Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 19 15:44:55 633 -8:46:18 - LMT 1900 Aug 20 12:00 634 -8:00 - PST 1942 635 -8:00 US P%sT 1946 636 -8:00 - PST 1969 637 -8:00 US P%sT 1983 Oct 30 2:00 638 -8:00 - PST 2015 Nov 1 2:00 639 -9:00 US AK%sT 2018 Nov 4 2:00 640 -8:00 - PST 2019 Mar Sun>=8 3:00 641 -9:00 US AK%sT 642Zone America/Yakutat 14:41:05 - LMT 1867 Oct 19 15:12:18 643 -9:18:55 - LMT 1900 Aug 20 12:00 644 -9:00 - YST 1942 645 -9:00 US Y%sT 1946 646 -9:00 - YST 1969 647 -9:00 US Y%sT 1983 Nov 30 648 -9:00 US AK%sT 649Zone America/Anchorage 14:00:24 - LMT 1867 Oct 19 14:31:37 650 -9:59:36 - LMT 1900 Aug 20 12:00 651 -10:00 - AST 1942 652 -10:00 US A%sT 1967 Apr 653 -10:00 - AHST 1969 654 -10:00 US AH%sT 1983 Oct 30 2:00 655 -9:00 US Y%sT 1983 Nov 30 656 -9:00 US AK%sT 657Zone America/Nome 12:58:22 - LMT 1867 Oct 19 13:29:35 658 -11:01:38 - LMT 1900 Aug 20 12:00 659 -11:00 - NST 1942 660 -11:00 US N%sT 1946 661 -11:00 - NST 1967 Apr 662 -11:00 - BST 1969 663 -11:00 US B%sT 1983 Oct 30 2:00 664 -9:00 US Y%sT 1983 Nov 30 665 -9:00 US AK%sT 666Zone America/Adak 12:13:22 - LMT 1867 Oct 19 12:44:35 667 -11:46:38 - LMT 1900 Aug 20 12:00 668 -11:00 - NST 1942 669 -11:00 US N%sT 1946 670 -11:00 - NST 1967 Apr 671 -11:00 - BST 1969 672 -11:00 US B%sT 1983 Oct 30 2:00 673 -10:00 US AH%sT 1983 Nov 30 674 -10:00 US H%sT 675# The following switches don't quite make our 1970 cutoff. 676# 677# Shanks writes that part of southwest Alaska (e.g. Aniak) 678# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 679# and another part (e.g. Akiak) made the same switch five weeks later. 680# 681# From David Flater (2004-11-09): 682# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 683# Historic Preservation Commission, provided this information, which 684# suggests that Unalaska deviated from statutory time from early 1967 685# possibly until 1983: 686# 687# Minutes of the Unalaska City Council Meeting, January 10, 1967: 688# "Except for St. Paul and Akutan, Unalaska is the only important 689# location not on Alaska Standard Time. The following resolution was 690# made by William Robinson and seconded by Henry Swanson: Be it 691# resolved that the City of Unalaska hereby goes to Alaska Standard 692# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 693# January 14, Alaska Standard Time.) This resolution was passed with 694# three votes for and one against." 695 696# Hawaii 697 698# From Arthur David Olson (2010-12-09): 699# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225 700# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09, 701# the article is available at 702# https://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf 703# and indicates that standard time was adopted effective noon, January 704# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight 705# saving for the period between the last Sunday of each April and the 706# last Sunday of each September, but less than a month later repealed the 707# act," (page 220), that year-round daylight saving time was in effect 708# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for 709# when clocks changed) and that clocks were changed by 30 minutes 710# effective the second Sunday of June, 1947 (page 219, with no time of 711# day given for when clocks changed). A footnote for the 1933 changes 712# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933) 713# and Act 163 (approved 21 May 1933)." 714 715# From Arthur David Olson (2011-01-19): 716# The following is from "Laws of the Territory of Hawaii Passed by the 717# Seventeenth Legislature: Regular Session 1933," available (as of 718# 2011-01-19) at American University's Pence Law Library. Page 85: "Act 719# 90...At 2 o'clock ante meridian of the last Sunday in April of each 720# year, the standard time of this Territory shall be advanced one 721# hour...This Act shall take effect upon its approval. Approved this 26th 722# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of 723# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is 724# hereby repealed...This Act shall take effect upon its approval, upon 725# which date the standard time of this Territory shall be restored to 726# that existing immediately prior to the taking effect of said Act 90. 727# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor 728# of the Territory of Hawaii." 729# 730# Note that 1933-05-21 was a Sunday. 731# We're left to guess the time of day when Act 163 was approved; guess noon. 732 733# Zone NAME GMTOFF RULES FORMAT [UNTIL] 734Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 735 -10:30 - HST 1933 Apr 30 2:00 736 -10:30 1:00 HDT 1933 May 21 12:00 737 -10:30 US H%sT 1947 Jun 8 2:00 738 -10:00 - HST 739 740# Now we turn to US areas that have diverged from the consensus since 1970. 741 742# Arizona mostly uses MST. 743 744# From Paul Eggert (2002-10-20): 745# 746# The information in the rest of this paragraph is derived from the 747# Daylight Saving Time web page 748# <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23) 749# maintained by the Arizona State Library, Archives and Public Records. 750# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 751# time, but by federal law railroads, airlines, bus lines, military 752# personnel, and some engaged in interstate commerce continued to 753# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 754# Gazette says that was the date the law changed, and that 04-01 was 755# the date the state's clocks would change. In 1945 the State of 756# Arizona used standard time all year, again with exceptions only as 757# mandated by federal law. Arizona observed DST in 1967, but Arizona 758# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 759# 760# Shanks says the 1944 experiment came to an end on 1944-03-17. 761# Go with the Arizona State Library instead. 762 763# Zone NAME GMTOFF RULES FORMAT [UNTIL] 764Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 765 -7:00 US M%sT 1944 Jan 1 0:01 766 -7:00 - MST 1944 Apr 1 0:01 767 -7:00 US M%sT 1944 Oct 1 0:01 768 -7:00 - MST 1967 769 -7:00 US M%sT 1968 Mar 21 770 -7:00 - MST 771# From Arthur David Olson (1988-02-13): 772# A writer from the Inter Tribal Council of Arizona, Inc., 773# notes in private correspondence dated 1987-12-28 that "Presently, only the 774# Navajo Nation participates in the Daylight Saving Time policy, due to its 775# large size and location in three states." (The "only" means that other 776# tribal nations don't use DST.) 777# 778# From Paul Eggert (2013-08-26): 779# See America/Denver for a zone appropriate for the Navajo Nation. 780 781# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 782# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 783# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 784# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 785# Teton, Twin Falls, Valley, Washington counties, and the southern 786# quarter of Idaho county) and eastern Oregon (most of Malheur County) 787# switched four weeks late in 1974. 788# 789# Zone NAME GMTOFF RULES FORMAT [UNTIL] 790Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 791 -8:00 US P%sT 1923 May 13 2:00 792 -7:00 US M%sT 1974 793 -7:00 - MST 1974 Feb 3 2:00 794 -7:00 US M%sT 795 796# Indiana 797# 798# For a map of Indiana's time zone regions, see: 799# https://en.wikipedia.org/wiki/Time_in_Indiana 800# 801# From Paul Eggert (2018-11-30): 802# A brief but entertaining history of time in Indiana describes a 1949 debate 803# in the Indiana House where city legislators (who favored "fast time") 804# tussled with farm legislators (who didn't) over a bill to outlaw DST: 805# "Lacking enough votes, the city faction tries to filibuster until time runs 806# out on the session at midnight, but rural champion Rep. Herbert Copeland, 807# R-Madison, leans over the gallery railing and forces the official clock 808# back to 9 p.m., breaking it in the process. The clock sticks on 9 as the 809# debate rages on into the night. The filibuster finally dies out and the 810# bill passes, while outside the chamber, clocks read 3:30 a.m. In the end, 811# it doesn't matter which side won. The law has no enforcement powers and 812# is simply ignored by fast-time communities." 813# How Indiana went from 'God's time' to split zones and daylight-saving. 814# Indianapolis Star. 2018-11-27 14:58 -05. 815# https://www.indystar.com/story/news/politics/2018/11/27/indianapolis-indiana-time-zone-history-central-eastern-daylight-savings-time/2126300002/ 816# 817# From Paul Eggert (2007-08-17): 818# Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 819# with the following exceptions: 820# 821# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 822# Vanderburgh, and Warrick counties have been like America/Chicago. 823# 824# - Dearborn and Ohio counties have been like America/New_York. 825# 826# - Clark, Floyd, and Harrison counties have been like 827# America/Kentucky/Louisville. 828# 829# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke, 830# and Switzerland counties have their own time zone histories as noted below. 831# 832# Shanks partitioned Indiana into 345 regions, each with its own time history, 833# and wrote "Even newspaper reports present contradictory information." 834# Those Hoosiers! Such a flighty and changeable people! 835# Fortunately, most of the complexity occurred before our cutoff date of 1970. 836# 837# Other than Indianapolis, the Indiana place names are so nondescript 838# that they would be ambiguous if we left them at the 'America' level. 839# So we reluctantly put them all in a subdirectory 'America/Indiana'. 840 841# From Paul Eggert (2014-06-26): 842# https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana 843# says "DOT is relocating the time zone boundary in Indiana to move Starke, 844# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the 845# Eastern Time Zone to the Central Time Zone.... The effective date of 846# this rule is 2 a.m. EST Sunday, April 2, 2006, which is the 847# changeover date from standard time to Daylight Saving Time." 848# Strictly speaking, this meant the affected counties changed their 849# clocks twice that night, but this obviously was in error. The intent 850# was that 01:59:59 EST be followed by 02:00:00 CDT. 851 852# From Gwillim Law (2007-02-10): 853# The Associated Press has been reporting that Pulaski County, Indiana is 854# going to switch from Central to Eastern Time on March 11, 2007.... 855# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL 856 857# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 858Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 859Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 860Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 861# Zone NAME GMTOFF RULES FORMAT [UNTIL] 862Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 863 -6:00 US C%sT 1920 864 -6:00 Indianapolis C%sT 1942 865 -6:00 US C%sT 1946 866 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 867 -5:00 - EST 1957 Sep 29 2:00 868 -6:00 - CST 1958 Apr 27 2:00 869 -5:00 - EST 1969 870 -5:00 US E%sT 1971 871 -5:00 - EST 2006 872 -5:00 US E%sT 873# 874# Eastern Crawford County, Indiana, left its clocks alone in 1974, 875# as well as from 1976 through 2005. 876# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 877Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 878Rule Marengo 1951 only - Sep lastSun 2:00 0 S 879Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 880Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 881# Zone NAME GMTOFF RULES FORMAT [UNTIL] 882Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 883 -6:00 US C%sT 1951 884 -6:00 Marengo C%sT 1961 Apr 30 2:00 885 -5:00 - EST 1969 886 -5:00 US E%sT 1974 Jan 6 2:00 887 -6:00 1:00 CDT 1974 Oct 27 2:00 888 -5:00 US E%sT 1976 889 -5:00 - EST 2006 890 -5:00 US E%sT 891# 892# Daviess, Dubois, Knox, and Martin Counties, Indiana, 893# switched from eastern to central time in April 2006, then switched back 894# in November 2007. 895# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 896Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D 897Rule Vincennes 1946 only - Sep lastSun 2:00 0 S 898Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D 899Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S 900Rule Vincennes 1955 only - May 1 0:00 1:00 D 901Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D 902Rule Vincennes 1960 only - Oct lastSun 2:00 0 S 903Rule Vincennes 1961 only - Sep lastSun 2:00 0 S 904Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S 905# Zone NAME GMTOFF RULES FORMAT [UNTIL] 906Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53 907 -6:00 US C%sT 1946 908 -6:00 Vincennes C%sT 1964 Apr 26 2:00 909 -5:00 - EST 1969 910 -5:00 US E%sT 1971 911 -5:00 - EST 2006 Apr 2 2:00 912 -6:00 US C%sT 2007 Nov 4 2:00 913 -5:00 US E%sT 914# 915# Perry County, Indiana, switched from eastern to central time in April 2006. 916# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 917Rule Perry 1946 only - Apr lastSun 2:00 1:00 D 918Rule Perry 1946 only - Sep lastSun 2:00 0 S 919Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D 920Rule Perry 1953 1959 - Sep lastSun 2:00 0 S 921Rule Perry 1955 only - May 1 0:00 1:00 D 922Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D 923Rule Perry 1960 only - Oct lastSun 2:00 0 S 924Rule Perry 1961 only - Sep lastSun 2:00 0 S 925Rule Perry 1962 1963 - Oct lastSun 2:00 0 S 926# Zone NAME GMTOFF RULES FORMAT [UNTIL] 927Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57 928 -6:00 US C%sT 1946 929 -6:00 Perry C%sT 1964 Apr 26 2:00 930 -5:00 - EST 1969 931 -5:00 US E%sT 1971 932 -5:00 - EST 2006 Apr 2 2:00 933 -6:00 US C%sT 934# 935# Pike County, Indiana moved from central to eastern time in 1977, 936# then switched back in 2006, then switched back again in 2007. 937# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 938Rule Pike 1955 only - May 1 0:00 1:00 D 939Rule Pike 1955 1960 - Sep lastSun 2:00 0 S 940Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D 941Rule Pike 1961 1964 - Oct lastSun 2:00 0 S 942# Zone NAME GMTOFF RULES FORMAT [UNTIL] 943Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53 944 -6:00 US C%sT 1955 945 -6:00 Pike C%sT 1965 Apr 25 2:00 946 -5:00 - EST 1966 Oct 30 2:00 947 -6:00 US C%sT 1977 Oct 30 2:00 948 -5:00 - EST 2006 Apr 2 2:00 949 -6:00 US C%sT 2007 Nov 4 2:00 950 -5:00 US E%sT 951# 952# Starke County, Indiana moved from central to eastern time in 1991, 953# then switched back in 2006. 954# From Arthur David Olson (1991-10-28): 955# An article on page A3 of the Sunday, 1991-10-27 Washington Post 956# notes that Starke County switched from Central time to Eastern time as of 957# 1991-10-27. 958# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 959Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 960Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 961Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 962Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 963Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 964# Zone NAME GMTOFF RULES FORMAT [UNTIL] 965Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 966 -6:00 US C%sT 1947 967 -6:00 Starke C%sT 1962 Apr 29 2:00 968 -5:00 - EST 1963 Oct 27 2:00 969 -6:00 US C%sT 1991 Oct 27 2:00 970 -5:00 - EST 2006 Apr 2 2:00 971 -6:00 US C%sT 972# 973# Pulaski County, Indiana, switched from eastern to central time in 974# April 2006 and then switched back in March 2007. 975# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 976Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D 977Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S 978Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S 979Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S 980# Zone NAME GMTOFF RULES FORMAT [UNTIL] 981Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35 982 -6:00 US C%sT 1946 983 -6:00 Pulaski C%sT 1961 Apr 30 2:00 984 -5:00 - EST 1969 985 -5:00 US E%sT 1971 986 -5:00 - EST 2006 Apr 2 2:00 987 -6:00 US C%sT 2007 Mar 11 2:00 988 -5:00 US E%sT 989# 990# Switzerland County, Indiana, did not observe DST from 1973 through 2005. 991# Zone NAME GMTOFF RULES FORMAT [UNTIL] 992Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 993 -6:00 US C%sT 1954 Apr 25 2:00 994 -5:00 - EST 1969 995 -5:00 US E%sT 1973 996 -5:00 - EST 2006 997 -5:00 US E%sT 998 999# From Paul Eggert (2018-03-20): 1000# The Louisville & Nashville Railroad's 1883-11-18 change occurred at 1001# 10:00 old local time; train were supposed to come to a standstill 1002# for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not 1003# clear how this matched civil time in Louisville, so for now continue 1004# to assume Louisville switched at noon new local time, like New York. 1005# 1006# Part of Kentucky left its clocks alone in 1974. 1007# This also includes Clark, Floyd, and Harrison counties in Indiana. 1008# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1009Rule Louisville 1921 only - May 1 2:00 1:00 D 1010Rule Louisville 1921 only - Sep 1 2:00 0 S 1011Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 1012Rule Louisville 1941 only - Sep lastSun 2:00 0 S 1013Rule Louisville 1946 only - Jun 2 2:00 0 S 1014Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 1015Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 1016# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1017Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 1018 -6:00 US C%sT 1921 1019 -6:00 Louisville C%sT 1942 1020 -6:00 US C%sT 1946 1021 -6:00 Louisville C%sT 1961 Jul 23 2:00 1022 -5:00 - EST 1968 1023 -5:00 US E%sT 1974 Jan 6 2:00 1024 -6:00 1:00 CDT 1974 Oct 27 2:00 1025 -5:00 US E%sT 1026# 1027# Wayne County, Kentucky 1028# 1029# From Lake Cumberland LIFE 1030# http://www.lake-cumberland.com/life/archive/news990129time.shtml 1031# (1999-01-29) via WKYM-101.7: 1032# Clinton County has joined Wayne County in asking the DoT to change from 1033# the Central to the Eastern time zone.... The Wayne County government made 1034# the same request in December. And while Russell County officials have not 1035# taken action, the majority of respondents to a poll conducted there in 1036# August indicated they would like to change to "fast time" also. 1037# The three Lake Cumberland counties are the farthest east of any U.S. 1038# location in the Central time zone. 1039# 1040# From Rich Wales (2000-08-29): 1041# After prolonged debate, and despite continuing deep differences of opinion, 1042# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 1043# (-0500) time. They won't "fall back" this year. See Sara Shipley, 1044# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 1045# 1046# From Paul Eggert (2001-07-16): 1047# The final rule was published in the 1048# Federal Register 65, 160 (2000-08-17), pp 50154-50158. 1049# https://www.gpo.gov/fdsys/pkg/FR-2000-08-17/html/00-20854.htm 1050# 1051Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 1052 -6:00 US C%sT 1946 1053 -6:00 - CST 1968 1054 -6:00 US C%sT 2000 Oct 29 2:00 1055 -5:00 US E%sT 1056 1057 1058# From Rives McDow (2000-08-30): 1059# Here ... are all the changes in the US since 1985. 1060# Kearny County, KS (put all of county on central; 1061# previously split between MST and CST) ... 1990-10 1062# Starke County, IN (from CST to EST) ... 1991-10 1063# Oliver County, ND (from MST to CST) ... 1992-10 1064# West Wendover, NV (from PST TO MST) ... 1999-10 1065# Wayne County, KY (from CST to EST) ... 2000-10 1066# 1067# From Paul Eggert (2001-07-17): 1068# We don't know where the line used to be within Kearny County, KS, 1069# so omit that change for now. 1070# See America/Indiana/Knox for the Starke County, IN change. 1071# See America/North_Dakota/Center for the Oliver County, ND change. 1072# West Wendover, NV officially switched from Pacific to mountain time on 1073# 1999-10-31. See the 1074# Federal Register 64, 203 (1999-10-21), pp 56705-56707. 1075# https://www.gpo.gov/fdsys/pkg/FR-1999-10-21/html/99-27240.htm 1076# However, the Federal Register says that West Wendover already operated 1077# on mountain time, and the rule merely made this official; 1078# hence a separate tz entry is not needed. 1079 1080# Michigan 1081# 1082# From Bob Devine (1988-01-28): 1083# Michigan didn't observe DST from 1968 to 1973. 1084# 1085# From Paul Eggert (1999-03-31): 1086# Shanks writes that Michigan started using standard time on 1885-09-18, 1087# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 1088# that Detroit kept 1089# 1090# local time until 1900 when the City Council decreed that clocks should 1091# be put back twenty-eight minutes to Central Standard Time. Half the 1092# city obeyed, half refused. After considerable debate, the decision 1093# was rescinded and the city reverted to Sun time. A derisive offer to 1094# erect a sundial in front of the city hall was referred to the 1095# Committee on Sewers. Then, in 1905, Central time was adopted 1096# by city vote. 1097# 1098# This story is too entertaining to be false, so go with Howse over Shanks. 1099# 1100# From Paul Eggert (2001-03-06): 1101# Garland (1927) writes "Cleveland and Detroit advanced their clocks 1102# one hour in 1914." This change is not in Shanks. We have no more 1103# info, so omit this for now. 1104# 1105# From Paul Eggert (2017-07-26): 1106# Although Shanks says Detroit observed DST in 1967 from 06-14 00:01 1107# until 10-29 00:01, I now see multiple reports that this is incorrect. 1108# For example, according to a 50-year anniversary report about the 1967 1109# Detroit riots and a major-league doubleheader on 1967-07-23, "By the time 1110# the last fly ball of the doubleheader settled into the glove of leftfielder 1111# Lenny Green, it was after 7 p.m. Detroit did not observe daylight saving 1112# time, so light was already starting to fail. Twilight was made even deeper 1113# by billowing columns of smoke that ascended in an unbroken wall north of the 1114# ballpark." See: Dow B. Detroit '67: As violence unfolded, Tigers played two 1115# at home vs. Yankees. Detroit Free Press 2017-07-23. 1116# https://www.freep.com/story/sports/mlb/tigers/2017/07/23/detroit-tigers-1967-riot-new-york-yankees/499951001/ 1117# 1118# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 1119# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1120Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 1121Rule Detroit 1948 only - Sep lastSun 2:00 0 S 1122# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1123Zone America/Detroit -5:32:11 - LMT 1905 1124 -6:00 - CST 1915 May 15 2:00 1125 -5:00 - EST 1942 1126 -5:00 US E%sT 1946 1127 -5:00 Detroit E%sT 1973 1128 -5:00 US E%sT 1975 1129 -5:00 - EST 1975 Apr 27 2:00 1130 -5:00 US E%sT 1131# 1132# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan, 1133# switched from EST to CST/CDT in 1973. 1134# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1135Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 1136Rule Menominee 1946 only - Sep lastSun 2:00 0 S 1137Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 1138Rule Menominee 1966 only - Oct lastSun 2:00 0 S 1139# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1140Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 1141 -6:00 US C%sT 1946 1142 -6:00 Menominee C%sT 1969 Apr 27 2:00 1143 -5:00 - EST 1973 Apr 29 2:00 1144 -6:00 US C%sT 1145 1146# Navassa 1147# administered by the US Fish and Wildlife Service 1148# claimed by US under the provisions of the 1856 Guano Islands Act 1149# also claimed by Haiti 1150# occupied 1857/1900 by the Navassa Phosphate Co 1151# US lighthouse 1917/1996-09 1152# currently uninhabited 1153# see Mark Fineman, "An Isle Rich in Guano and Discord", 1154# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 1155# Jimmy Skaggs, _The Great Guano Rush_ (1994). 1156 1157################################################################################ 1158 1159 1160# From Paul Eggert (2017-02-10): 1161# 1162# Unless otherwise specified, the source for data through 1990 is: 1163# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 1164# San Diego: ACS Publications, Inc. (2003). 1165# Unfortunately this book contains many errors and cites no sources. 1166# 1167# Many years ago Gwillim Law wrote that a good source 1168# for time zone data was the International Air Transport 1169# Association's Standard Schedules Information Manual (IATA SSIM), 1170# published semiannually. Law sent in several helpful summaries 1171# of the IATA's data after 1990. Except where otherwise noted, 1172# IATA SSIM is the source for entries after 1990. 1173# 1174# Other sources occasionally used include: 1175# 1176# Edward W. Whitman, World Time Differences, 1177# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 1178# which I found in the UCLA library. 1179# 1180# William Willett, The Waste of Daylight, 19th edition 1181# <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf> 1182# [PDF] (1914-03) 1183# 1184# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94 1185# <https://www.jstor.org/stable/1774359>. 1186# 1187# See the 'europe' file for Greenland. 1188 1189# Canada 1190 1191# From Alain LaBonté (1994-11-14): 1192# I post here the time zone abbreviations standardized in Canada 1193# for both English and French in the CAN/CSA-Z234.4-89 standard.... 1194# 1195# UTC Standard time Daylight saving time 1196# offset French English French English 1197# -2:30 - - HAT NDT 1198# -3 - - HAA ADT 1199# -3:30 HNT NST - - 1200# -4 HNA AST HAE EDT 1201# -5 HNE EST HAC CDT 1202# -6 HNC CST HAR MDT 1203# -7 HNR MST HAP PDT 1204# -8 HNP PST HAY YDT 1205# -9 HNY YST - - 1206# 1207# HN: Heure Normale ST: Standard Time 1208# HA: Heure Avancée DT: Daylight saving Time 1209# 1210# A: de l'Atlantique Atlantic 1211# C: du Centre Central 1212# E: de l'Est Eastern 1213# M: Mountain 1214# N: Newfoundland 1215# P: du Pacifique Pacific 1216# R: des Rocheuses 1217# T: de Terre-Neuve 1218# Y: du Yukon Yukon 1219# 1220# From Paul Eggert (1994-11-22): 1221# Alas, this sort of thing must be handled by localization software. 1222 1223# Unless otherwise specified, the data entries for Canada are all from Shanks 1224# & Pottenger. 1225 1226# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31, 1227# 2007-03-01): 1228# The British Columbia government announced yesterday that it will 1229# adjust daylight savings next year to align with changes in the 1230# U.S. and the rest of Canada.... 1231# https://archive.news.gov.bc.ca/releases/news_releases_2005-2009/2006AG0014-000330.htm 1232# ... 1233# Nova Scotia 1234# Daylight saving time will be extended by four weeks starting in 2007.... 1235# https://www.novascotia.ca/just/regulations/rg2/2006/ma1206.pdf 1236# 1237# [For New Brunswick] the new legislation dictates that the time change is to 1238# be done at 02:00 instead of 00:01. 1239# https://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf 1240# ... 1241# Manitoba has traditionally changed the clock every fall at 03:00. 1242# As of 2006, the transition is to take place one hour earlier at 02:00. 1243# https://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php 1244# ... 1245# [Alberta, Ontario, Quebec] will follow US rules. 1246# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM 1247# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm 1248# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF 1249# ... 1250# P.E.I. will follow US rules.... 1251# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf 1252# ... 1253# Province of Newfoundland and Labrador.... 1254# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm 1255# ... 1256# Yukon 1257# https://www.gov.yk.ca/legislation/regs/oic2006_127.pdf 1258# ... 1259# N.W.T. will follow US rules. Whoever maintains the government web site 1260# does not seem to believe in bookmarks. To see the news release, click the 1261# following link and search for "Daylight Savings Time Change". Press the 1262# "Daylight Savings Time Change" link; it will fire off a popup using 1263# JavaScript. 1264# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive 1265# ... 1266# Nunavut 1267# An amendment to the Interpretation Act was registered on February 19/2007.... 1268# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf 1269 1270# From Paul Eggert (2014-10-18): 1271# H. David Matthews and Mary Vincent's map 1272# "It's about TIME", _Canadian Geographic_ (September-October 1998) 1273# http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp 1274# contains detailed boundaries for regions observing nonstandard 1275# time and daylight saving time arrangements in Canada circa 1998. 1276# 1277# National Research Council Canada maintains info about time zones and DST. 1278# https://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html 1279# https://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5 1280# Its unofficial information is often taken from Matthews and Vincent. 1281 1282# From Paul Eggert (2006-06-27): 1283# For now, assume all of DST-observing Canada will fall into line with the 1284# new US DST rules, 1285 1286# From Chris Walton (2011-12-01) 1287# In the first of Tammy Hardwick's articles 1288# http://www.ilovecreston.com/?p=articles&t=spec&ar=260 1289# she quotes the Friday November 1/1918 edition of the Creston Review. 1290# The quote includes these two statements: 1291# 'Sunday the CPR went back to the old system of time...' 1292# '... The daylight saving scheme was dropped all over Canada at the same time,' 1293# These statements refer to a transition from daylight time to standard time 1294# that occurred nationally on Sunday October 27/1918. This transition was 1295# also documented in the Saturday October 26/1918 edition of the Toronto Star. 1296 1297# In light of that evidence, we alter the date from the earlier believed 1298# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day 1299# than Thursday) in all Canadian rulesets. 1300 1301# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1302Rule Canada 1918 only - Apr 14 2:00 1:00 D 1303Rule Canada 1918 only - Oct 27 2:00 0 S 1304Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 1305Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 1306Rule Canada 1945 only - Sep 30 2:00 0 S 1307Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 1308Rule Canada 1974 2006 - Oct lastSun 2:00 0 S 1309Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D 1310Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D 1311Rule Canada 2007 max - Nov Sun>=1 2:00 0 S 1312 1313 1314# Newfoundland and Labrador 1315 1316# From Paul Eggert (2017-10-14): 1317# Legally Labrador should observe Newfoundland time; see: 1318# McLeod J. Labrador time - legal or not? St. John's Telegram, 2017-10-07 1319# http://www.thetelegram.com/news/local/labrador-time--legal-or-not-154860/ 1320# Matthews and Vincent (1998) write that the only part of Labrador 1321# that follows the rules is the southeast corner, including Port Hope 1322# Simpson and Mary's Harbour, but excluding, say, Black Tickle. 1323 1324# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1325Rule StJohns 1917 only - Apr 8 2:00 1:00 D 1326Rule StJohns 1917 only - Sep 17 2:00 0 S 1327# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger. 1328Rule StJohns 1919 only - May 5 23:00 1:00 D 1329Rule StJohns 1919 only - Aug 12 23:00 0 S 1330# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger. 1331Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 1332Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 1333# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks & 1334# Pottenger. 1335Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 1336Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 1337# Whitman gives the following transitions: 1338# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 1339# but go with Shanks & Pottenger and assume they used Canadian rules. 1340# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 1341# Apr 30 - Sep 24; go with Shanks & Pottenger. 1342Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 1343Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 1344Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 1345Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 1346Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 1347# From Paul Eggert (2000-10-02): 1348# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 1349# at 00:01 local time. For now, assume it started in 1987. 1350 1351# From Michael Pelley (2011-09-12): 1352# We received today, Monday, September 12, 2011, notification that the 1353# changes to the Newfoundland Standard Time Act have been proclaimed. 1354# The change in the Act stipulates that the change from Daylight Savings 1355# Time to Standard Time and from Standard Time to Daylight Savings Time 1356# now occurs at 2:00AM. 1357# ... 1358# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm 1359# ... 1360# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery 1361# Office of the Chief Information Officer 1362# Executive Council 1363# Government of Newfoundland & Labrador 1364 1365Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 1366Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S 1367Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 1368Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D 1369Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D 1370Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S 1371# 1372# St John's has an apostrophe, but Posix file names can't have apostrophes. 1373# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1374Zone America/St_Johns -3:30:52 - LMT 1884 1375 -3:30:52 StJohns N%sT 1918 1376 -3:30:52 Canada N%sT 1919 1377 -3:30:52 StJohns N%sT 1935 Mar 30 1378 -3:30 StJohns N%sT 1942 May 11 1379 -3:30 Canada N%sT 1946 1380 -3:30 StJohns N%sT 2011 Nov 1381 -3:30 Canada N%sT 1382 1383# most of east Labrador 1384 1385# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'. 1386# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1387Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 1388 -3:30:52 - NST 1918 1389 -3:30:52 Canada N%sT 1919 1390 -3:30:52 - NST 1935 Mar 30 1391 -3:30 - NST 1936 1392 -3:30 StJohns N%sT 1942 May 11 1393 -3:30 Canada N%sT 1946 1394 -3:30 StJohns N%sT 1966 Mar 15 2:00 1395 -4:00 StJohns A%sT 2011 Nov 1396 -4:00 Canada A%sT 1397 1398 1399# west Labrador, Nova Scotia, Prince Edward I 1400 1401# From Brian Inglis (2015-07-20): 1402# From the historical weather station records available at: 1403# https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada 1404# Sydney shares the same time history as Glace Bay, so was 1405# likely to be the same across the island.... 1406# Sydney, as the capital and most populous location, or Cape Breton, would 1407# have been better names for the zone had we known this in 1996. 1408 1409# From Paul Eggert (2015-07-20): 1410# Shanks & Pottenger write that since 1970 most of this region has been like 1411# Halifax. Many locales did not observe peacetime DST until 1972; 1412# the Cape Breton area, represented by Glace Bay, is the largest we know of 1413# (Glace Bay was perhaps not the best name choice but no point changing now). 1414# Shanks & Pottenger also write that Liverpool, NS was the only town 1415# in Canada to observe DST in 1971 but not 1970; for now we'll assume 1416# this is a typo. 1417 1418# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1419Rule Halifax 1916 only - Apr 1 0:00 1:00 D 1420Rule Halifax 1916 only - Oct 1 0:00 0 S 1421Rule Halifax 1920 only - May 9 0:00 1:00 D 1422Rule Halifax 1920 only - Aug 29 0:00 0 S 1423Rule Halifax 1921 only - May 6 0:00 1:00 D 1424Rule Halifax 1921 1922 - Sep 5 0:00 0 S 1425Rule Halifax 1922 only - Apr 30 0:00 1:00 D 1426Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 1427Rule Halifax 1923 only - Sep 4 0:00 0 S 1428Rule Halifax 1924 only - Sep 15 0:00 0 S 1429Rule Halifax 1925 only - Sep 28 0:00 0 S 1430Rule Halifax 1926 only - May 16 0:00 1:00 D 1431Rule Halifax 1926 only - Sep 13 0:00 0 S 1432Rule Halifax 1927 only - May 1 0:00 1:00 D 1433Rule Halifax 1927 only - Sep 26 0:00 0 S 1434Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 1435Rule Halifax 1928 only - Sep 9 0:00 0 S 1436Rule Halifax 1929 only - Sep 3 0:00 0 S 1437Rule Halifax 1930 only - Sep 15 0:00 0 S 1438Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 1439Rule Halifax 1932 only - May 1 0:00 1:00 D 1440Rule Halifax 1933 only - Apr 30 0:00 1:00 D 1441Rule Halifax 1933 only - Oct 2 0:00 0 S 1442Rule Halifax 1934 only - May 20 0:00 1:00 D 1443Rule Halifax 1934 only - Sep 16 0:00 0 S 1444Rule Halifax 1935 only - Jun 2 0:00 1:00 D 1445Rule Halifax 1935 only - Sep 30 0:00 0 S 1446Rule Halifax 1936 only - Jun 1 0:00 1:00 D 1447Rule Halifax 1936 only - Sep 14 0:00 0 S 1448Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 1449Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 1450Rule Halifax 1939 only - May 28 0:00 1:00 D 1451Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 1452Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 1453Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 1454Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 1455Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 1456Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 1457Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 1458Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 1459Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 1460# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1461Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 1462 -4:00 Halifax A%sT 1918 1463 -4:00 Canada A%sT 1919 1464 -4:00 Halifax A%sT 1942 Feb 9 2:00s 1465 -4:00 Canada A%sT 1946 1466 -4:00 Halifax A%sT 1974 1467 -4:00 Canada A%sT 1468Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 1469 -4:00 Canada A%sT 1953 1470 -4:00 Halifax A%sT 1954 1471 -4:00 - AST 1972 1472 -4:00 Halifax A%sT 1974 1473 -4:00 Canada A%sT 1474 1475# New Brunswick 1476 1477# From Paul Eggert (2007-01-31): 1478# The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf> 1479# says they changed at 00:01 through 2006, and 1480# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it 1481# clear that this was the case since at least 1993. 1482# For now, assume it started in 1993. 1483 1484# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1485Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D 1486Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S 1487Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D 1488Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S 1489Rule Moncton 1939 only - May 27 1:00 1:00 D 1490Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S 1491Rule Moncton 1940 only - May 19 1:00 1:00 D 1492Rule Moncton 1941 only - May 4 1:00 1:00 D 1493Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D 1494Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S 1495Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S 1496Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D 1497Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S 1498# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1499Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 1500 -5:00 - EST 1902 Jun 15 1501 -4:00 Canada A%sT 1933 1502 -4:00 Moncton A%sT 1942 1503 -4:00 Canada A%sT 1946 1504 -4:00 Moncton A%sT 1973 1505 -4:00 Canada A%sT 1993 1506 -4:00 Moncton A%sT 2007 1507 -4:00 Canada A%sT 1508 1509# Quebec 1510 1511# From Paul Eggert (2015-03-24): 1512# See America/Toronto for most of Quebec, including Montreal. 1513# 1514# Matthews and Vincent (1998) also write that Quebec east of the -63 1515# meridian is supposed to observe AST, but residents as far east as 1516# Natashquan use EST/EDT, and residents east of Natashquan use AST. 1517# The Quebec department of justice writes in 1518# "The situation in Minganie and Basse-Côte-Nord" 1519# http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm 1520# that the coastal strip from just east of Natashquan to Blanc-Sablon 1521# observes Atlantic standard time all year round. 1522# https://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en 1523# says this common practice was codified into law as of 2007. 1524# For lack of better info, guess this practice began around 1970, contra to 1525# Shanks & Pottenger who have this region observing AST/ADT. 1526 1527# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1528Zone America/Blanc-Sablon -3:48:28 - LMT 1884 1529 -4:00 Canada A%sT 1970 1530 -4:00 - AST 1531 1532# Ontario 1533 1534# From Paul Eggert (2006-07-09): 1535# Shanks & Pottenger write that since 1970 most of Ontario has been like 1536# Toronto. 1537# Thunder Bay skipped DST in 1973. 1538# Many smaller locales did not observe peacetime DST until 1974; 1539# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1540# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 1541 1542# From Mark Brader (2003-07-26): 1543# [According to the Toronto Star] Orillia, Ontario, adopted DST 1544# effective Saturday, 1912-06-22, 22:00; the article mentions that 1545# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 1546# have already done so. In Orillia DST was to run until Saturday, 1547# 1912-08-31 (no time mentioned), but it was met with considerable 1548# hostility from certain segments of the public, and was revoked after 1549# only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but 1550# presumably that should be -07-06. (1912-06-19, -07-12; also letters 1551# earlier in June). 1552# 1553# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 1554# 1555# From Paul Eggert (2017-07-08): 1556# For more on Orillia, see: Daubs K. Bold attempt at daylight saving 1557# time became a comic failure in Orillia. Toronto Star 2017-07-08. 1558# https://www.thestar.com/news/insight/2017/07/08/bold-attempt-at-daylight-saving-time-became-a-comic-failure-in-orillia.html 1559 1560# From Paul Eggert (1997-10-17): 1561# Mark Brader writes that an article in the 1997-10-14 Toronto Star 1562# says that Atikokan, Ontario currently does not observe DST, 1563# but will vote on 11-10 whether to use EST/EDT. 1564# He also writes that the Ontario Time Act (1990, Chapter T.9) 1565# http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html 1566# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 1567# Officially Atikokan is therefore on CST/CDT, and most likely this report 1568# concerns a non-official time observed as a matter of local practice. 1569# 1570# From Paul Eggert (2000-10-02): 1571# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 1572# New Osnaburgh observe CST all year, that Big Trout Lake observes 1573# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 1574# violation of the official Ontario rules. 1575# 1576# From Paul Eggert (2006-07-09): 1577# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the 1578# 2005-07-21 Chronicle-Journal, which said: 1579# 1580# The clocks in Atikokan stay set on standard time year-round. 1581# This means they spend about half the time on central time and 1582# the other half on eastern time. 1583# 1584# For the most part, the system works, Mayor Dennis Brown said. 1585# 1586# "The majority of businesses in Atikokan deal more with Eastern 1587# Canada, but there are some that deal with Western Canada," he 1588# said. "I don't see any changes happening here." 1589# 1590# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang 1591# [New Osnaburgh] follow the same practice." 1592 1593# From Garry McKinnon (2006-07-14) via Chris Walton: 1594# I chatted with a member of my board who has an outstanding memory 1595# and a long history in Atikokan (and in the telecom industry) and he 1596# can say for certain that Atikokan has been practicing the current 1597# time keeping since 1952, at least. 1598 1599# From Paul Eggert (2006-07-17): 1600# Shanks & Pottenger say that Atikokan has agreed with Rainy River 1601# ever since standard time was introduced, but the information from 1602# McKinnon sounds more authoritative. For now, assume that Atikokan 1603# switched to EST immediately after WWII era daylight saving time 1604# ended. This matches the old (less-populous) America/Coral_Harbour 1605# entry since our cutoff date of 1970, so we can move 1606# America/Coral_Harbour to the 'backward' file. 1607 1608# From Mark Brader (2010-03-06): 1609# 1610# Currently the database has: 1611# 1612# # Ontario 1613# 1614# # From Paul Eggert (2006-07-09): 1615# # Shanks & Pottenger write that since 1970 most of Ontario has been like 1616# # Toronto. 1617# # Thunder Bay skipped DST in 1973. 1618# # Many smaller locales did not observe peacetime DST until 1974; 1619# # Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1620# 1621# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom 1622# right corner of page 1, it says that Toronto will return to standard 1623# time at 2 am Sunday morning (which agrees with the database), and that: 1624# 1625# The one-hour setback will go into effect throughout most of Ontario, 1626# except in areas like Windsor which remains on standard time all year. 1627# 1628# Windsor is, of course, a lot larger than Nipigon. 1629# 1630# I only came across this incidentally. I don't know if Windsor began 1631# observing DST when Detroit did, or in 1974, or on some other date. 1632# 1633# By the way, the article continues by noting that: 1634# 1635# Some cities in the United States have pushed the deadline back 1636# three weeks and will change over from daylight saving in October. 1637 1638# From Arthur David Olson (2010-07-17): 1639# 1640# "Standard Time and Time Zones in Canada" appeared in 1641# The Journal of The Royal Astronomical Society of Canada, 1642# volume 26, number 2 (February 1932) and, as of 2010-07-17, 1643# was available at 1644# http://adsabs.harvard.edu/full/1932JRASC..26...49S 1645# 1646# It includes the text below (starting on page 57): 1647# 1648# A list of the places in Canada using daylight saving time would 1649# require yearly revision. From information kindly furnished by 1650# the provincial governments and by the postmasters in many cities 1651# and towns, it is found that the following places used daylight sav- 1652# ing in 1930. The information for the province of Quebec is definite, 1653# for the other provinces only approximate: 1654# 1655# Province Daylight saving time used 1656# Prince Edward Island Not used. 1657# Nova Scotia In Halifax only. 1658# New Brunswick In St. John only. 1659# Quebec In the following places: 1660# Montreal Lachine 1661# Quebec Mont-Royal 1662# Lévis Iberville 1663# St. Lambert Cap de la Madelèine 1664# Verdun Loretteville 1665# Westmount Richmond 1666# Outremont St. Jérôme 1667# Longueuil Greenfield Park 1668# Arvida Waterloo 1669# Chambly-Canton Beaulieu 1670# Melbourne La Tuque 1671# St. Théophile Buckingham 1672# Ontario Used generally in the cities and towns along 1673# the southerly part of the province. Not 1674# used in the northwesterly part. 1675# Manitoba Not used. 1676# Saskatchewan In Regina only. 1677# Alberta Not used. 1678# British Columbia Not used. 1679# 1680# With some exceptions, the use of daylight saving may be said to be limited 1681# to those cities and towns lying between Quebec city and Windsor, Ont. 1682 1683# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1684Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1685Rule Toronto 1919 only - Oct 26 0:00 0 S 1686Rule Toronto 1920 only - May 2 2:00 1:00 D 1687Rule Toronto 1920 only - Sep 26 0:00 0 S 1688Rule Toronto 1921 only - May 15 2:00 1:00 D 1689Rule Toronto 1921 only - Sep 15 2:00 0 S 1690Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1691# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16" 1692# was meant. 1693Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1694Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1695# The 1927-to-1939 rules can be expressed more simply as 1696# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1697# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1698# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1699# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1700# The rules below avoid use of Sun>=25 1701# (which pre-2004 versions of zic cannot handle). 1702Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1703Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1704Rule Toronto 1932 only - May 1 2:00 1:00 D 1705Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1706Rule Toronto 1933 only - Oct 1 2:00 0 S 1707Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1708Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1709Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1710Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1711Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1712Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1713Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1714Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1715Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1716# Shanks & Pottenger say Toronto ended DST a week early in 1971, 1717# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this 1718# is wrong, and that he had confirmed it by checking the 1971-10-30 1719# Toronto Star, which said that DST was ending 1971-10-31 as usual. 1720Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1721 1722# From Paul Eggert (2003-07-27): 1723# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1724# Port Arthur, Ontario, the principle of the Bill has been in 1725# operation for the past three years, and in the City of Moose Jaw, 1726# Saskatchewan, for one year." 1727 1728# From David Bryan via Tory Tronrud, Director/Curator, 1729# Thunder Bay Museum (2003-11-12): 1730# There is some suggestion, however, that, by-law or not, daylight 1731# savings time was being practiced in Fort William and Port Arthur 1732# before 1909.... [I]n 1910, the line between the Eastern and Central 1733# Time Zones was permanently moved about two hundred miles west to 1734# include the Thunder Bay area.... When Canada adopted daylight 1735# savings time in 1916, Fort William and Port Arthur, having done so 1736# already, did not change their clocks.... During the Second World 1737# War,... [t]he cities agreed to implement DST during the summer 1738# months for the remainder of the war years. 1739 1740# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1741Zone America/Toronto -5:17:32 - LMT 1895 1742 -5:00 Canada E%sT 1919 1743 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1744 -5:00 Canada E%sT 1946 1745 -5:00 Toronto E%sT 1974 1746 -5:00 Canada E%sT 1747Zone America/Thunder_Bay -5:57:00 - LMT 1895 1748 -6:00 - CST 1910 1749 -5:00 - EST 1942 1750 -5:00 Canada E%sT 1970 1751 -5:00 Toronto E%sT 1973 1752 -5:00 - EST 1974 1753 -5:00 Canada E%sT 1754Zone America/Nipigon -5:53:04 - LMT 1895 1755 -5:00 Canada E%sT 1940 Sep 29 1756 -5:00 1:00 EDT 1942 Feb 9 2:00s 1757 -5:00 Canada E%sT 1758Zone America/Rainy_River -6:18:16 - LMT 1895 1759 -6:00 Canada C%sT 1940 Sep 29 1760 -6:00 1:00 CDT 1942 Feb 9 2:00s 1761 -6:00 Canada C%sT 1762Zone America/Atikokan -6:06:28 - LMT 1895 1763 -6:00 Canada C%sT 1940 Sep 29 1764 -6:00 1:00 CDT 1942 Feb 9 2:00s 1765 -6:00 Canada C%sT 1945 Sep 30 2:00 1766 -5:00 - EST 1767 1768 1769# Manitoba 1770 1771# From Rob Douglas (2006-04-06): 1772# the old Manitoba Time Act - as amended by Bill 2, assented to 1773# March 27, 1987 ... said ... 1774# "between two o'clock Central Standard Time in the morning of 1775# the first Sunday of April of each year and two o'clock Central 1776# Standard Time in the morning of the last Sunday of October next 1777# following, one hour in advance of Central Standard Time."... 1778# I believe that the English legislation [of the old time act] had 1779# been assented to (March 22, 1967).... 1780# Also, as far as I can tell, there was no order-in-council varying 1781# the time of Daylight Saving Time for 2005 and so the provisions of 1782# the 1987 version would apply - the changeover was at 2:00 Central 1783# Standard Time (i.e. not until 3:00 Central Daylight Time). 1784 1785# From Paul Eggert (2006-04-10): 1786# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s) 1787# starting 1966. Since 02:00s is clearly correct for 1967 on, assume 1788# it was also 02:00s in 1966. 1789 1790# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1791Rule Winn 1916 only - Apr 23 0:00 1:00 D 1792Rule Winn 1916 only - Sep 17 0:00 0 S 1793Rule Winn 1918 only - Apr 14 2:00 1:00 D 1794Rule Winn 1918 only - Oct 27 2:00 0 S 1795Rule Winn 1937 only - May 16 2:00 1:00 D 1796Rule Winn 1937 only - Sep 26 2:00 0 S 1797Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1798Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1799Rule Winn 1945 only - Sep lastSun 2:00 0 S 1800Rule Winn 1946 only - May 12 2:00 1:00 D 1801Rule Winn 1946 only - Oct 13 2:00 0 S 1802Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1803Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1804Rule Winn 1950 only - May 1 2:00 1:00 D 1805Rule Winn 1950 only - Sep 30 2:00 0 S 1806Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1807Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1808Rule Winn 1959 only - Oct lastSun 2:00 0 S 1809Rule Winn 1960 only - Sep lastSun 2:00 0 S 1810Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1811Rule Winn 1963 only - Sep 22 2:00 0 S 1812Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D 1813Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S 1814Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D 1815# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1816Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1817 -6:00 Winn C%sT 2006 1818 -6:00 Canada C%sT 1819 1820 1821# Saskatchewan 1822 1823# From Mark Brader (2003-07-26): 1824# The first actual adoption of DST in Canada was at the municipal 1825# level. As the [Toronto] Star put it (1912-06-07), "While people 1826# elsewhere have long been talking of legislation to save daylight, 1827# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1828# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1829# presumably late evening, as below), and would run until "the end of 1830# the summer". The discrepancy between municipal time and railroad 1831# time was noted. 1832 1833# From Paul Eggert (2003-07-27): 1834# Willett (1914-03) notes that DST "has been in operation ... in the 1835# City of Moose Jaw, Saskatchewan, for one year." 1836 1837# From Paul Eggert (2006-03-22): 1838# Shanks & Pottenger say that since 1970 this region has mostly been as Regina. 1839# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1840# Other western towns (e.g. Lloydminster) are like Edmonton. 1841# Matthews and Vincent (1998) write that Denare Beach and Creighton 1842# are like Winnipeg, in violation of Saskatchewan law. 1843 1844# From W. Jones (1992-11-06): 1845# The. . .below is based on information I got from our law library, the 1846# provincial archives, and the provincial Community Services department. 1847# A precise history would require digging through newspaper archives, and 1848# since you didn't say what you wanted, I didn't bother. 1849# 1850# Saskatchewan is split by a time zone meridian (105W) and over the years 1851# the boundary became pretty ragged as communities near it reevaluated 1852# their affiliations in one direction or the other. In 1965 a provincial 1853# referendum favoured legislating common time practices. 1854# 1855# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1856# Saskatchewan 1978) was proclaimed, and established that the eastern 1857# part of Saskatchewan would use CST year round, that districts in 1858# northwest Saskatchewan would by default follow CST but could opt to 1859# follow Mountain Time rules (thus 1 hour difference in the winter and 1860# zero in the summer), and that districts in southwest Saskatchewan would 1861# by default follow MT but could opt to follow CST. 1862# 1863# It took a few years for the dust to settle (I know one story of a town 1864# on one time zone having its school in another, such that a mom had to 1865# serve her family lunch in two shifts), but presently it seems that only 1866# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1867# rules any more; all other districts appear to have used CST year round 1868# since sometime in the 1960s. 1869 1870# From Chris Walton (2006-06-26): 1871# The Saskatchewan time act which was last updated in 1996 is about 30 pages 1872# long and rather painful to read. 1873# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf 1874 1875# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1876Rule Regina 1918 only - Apr 14 2:00 1:00 D 1877Rule Regina 1918 only - Oct 27 2:00 0 S 1878Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1879Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1880Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1881Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1882Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1883Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1884Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1885Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1886Rule Regina 1945 only - Sep lastSun 2:00 0 S 1887Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1888Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1889Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1890Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1891Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1892Rule Regina 1959 only - Oct lastSun 2:00 0 S 1893# 1894Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1895Rule Swift 1957 only - Oct lastSun 2:00 0 S 1896Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1897Rule Swift 1959 only - Oct lastSun 2:00 0 S 1898Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1899# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1900Zone America/Regina -6:58:36 - LMT 1905 Sep 1901 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1902 -6:00 - CST 1903Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1904 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1905 -7:00 Regina M%sT 1950 1906 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1907 -6:00 - CST 1908 1909 1910# Alberta 1911 1912# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1913Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1914Rule Edm 1918 only - Oct 27 2:00 0 S 1915Rule Edm 1919 only - May 27 2:00 0 S 1916Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1917Rule Edm 1920 only - Oct lastSun 2:00 0 S 1918Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1919Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1920Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1921Rule Edm 1945 only - Sep lastSun 2:00 0 S 1922Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1923Rule Edm 1947 only - Sep lastSun 2:00 0 S 1924Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1925Rule Edm 1967 only - Oct lastSun 2:00 0 S 1926Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1927Rule Edm 1969 only - Oct lastSun 2:00 0 S 1928Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1929Rule Edm 1972 2006 - Oct lastSun 2:00 0 S 1930# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1931Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1932 -7:00 Edm M%sT 1987 1933 -7:00 Canada M%sT 1934 1935 1936# British Columbia 1937 1938# From Paul Eggert (2006-03-22): 1939# Shanks & Pottenger write that since 1970 most of this region has 1940# been like Vancouver. 1941# Dawson Creek uses MST. Much of east BC is like Edmonton. 1942# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1943 1944# It seems though that (re: Creston) is not entirely correct: 1945 1946# From Chris Walton (2011-12-01): 1947# There are two areas within the Canadian province of British Columbia 1948# that do not currently observe daylight saving: 1949# a) The Creston Valley (includes the town of Creston and surrounding area) 1950# b) The eastern half of the Peace River Regional District 1951# (includes the cities of Dawson Creek and Fort St. John) 1952 1953# Earlier this year I stumbled across a detailed article about the time 1954# keeping history of Creston; it was written by Tammy Hardwick who is the 1955# manager of the Creston & District Museum. The article was written in May 2009. 1956# http://www.ilovecreston.com/?p=articles&t=spec&ar=260 1957# According to the article, Creston has not changed its clocks since June 1918. 1958# i.e. Creston has been stuck on UT-7 for 93 years. 1959# Dawson Creek, on the other hand, changed its clocks as recently as April 1972. 1960 1961# Unfortunately the exact date for the time change in June 1918 remains 1962# unknown and will be difficult to ascertain. I e-mailed Tammy a few months 1963# ago to ask if Sunday June 2 was a reasonable guess. She said it was just 1964# as plausible as any other date (in June). She also said that after writing 1965# the article she had discovered another time change in 1916; this is the 1966# subject of another article which she wrote in October 2010. 1967# http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56 1968 1969# Here is a summary of the three clock change events in Creston's history: 1970# 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7) 1971# Exact date unknown 1972# 2. Oct 1916: switch to Pacific Standard Time (GMT-8) 1973# Exact date in October unknown; Sunday October 1 is a reasonable guess. 1974# 3. June 1918: switch to Pacific Daylight Time (GMT-7) 1975# Exact date in June unknown; Sunday June 2 is a reasonable guess. 1976# note 1: 1977# On Oct 27/1918 when daylight saving ended in the rest of Canada, 1978# Creston did not change its clocks. 1979# note 2: 1980# During WWII when the Federal Government legislated a mandatory clock change, 1981# Creston did not oblige. 1982# note 3: 1983# There is no guarantee that Creston will remain on Mountain Standard Time 1984# (UTC-7) forever. 1985# The subject was debated at least once this year by the town Council. 1986# http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html 1987 1988# During a period WWII, summer time (Daylight saying) was mandatory in Canada. 1989# In Creston, that was handled by shifting the area to PST (-8:00) then applying 1990# summer time to cause the offset to be -7:00, the same as it had been before 1991# the change. It can be argued that the timezone abbreviation during this 1992# period should be PDT rather than MST, but that doesn't seem important enough 1993# (to anyone) to further complicate the rules. 1994 1995# The transition dates (and times) are guesses. 1996 1997# From Matt Johnson (2015-09-21): 1998# Fort Nelson, BC, Canada will cancel DST this year. So while previously they 1999# were aligned with America/Vancouver, they're now aligned with 2000# America/Dawson_Creek. 2001# http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html 2002# 2003# From Tim Parenti (2015-09-23): 2004# This requires a new zone for the Northern Rockies Regional Municipality, 2005# America/Fort_Nelson. The resolution of 2014-12-08 was reached following a 2006# 2014-11-15 poll with nearly 75% support. Effectively, the municipality has 2007# been on MST (-0700) like Dawson Creek since it advanced its clocks on 2008# 2015-03-08. 2009# 2010# From Paul Eggert (2015-09-23): 2011# Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver. 2012 2013# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2014Rule Vanc 1918 only - Apr 14 2:00 1:00 D 2015Rule Vanc 1918 only - Oct 27 2:00 0 S 2016Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 2017Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 2018Rule Vanc 1945 only - Sep 30 2:00 0 S 2019Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 2020Rule Vanc 1946 only - Oct 13 2:00 0 S 2021Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 2022Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S 2023# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2024Zone America/Vancouver -8:12:28 - LMT 1884 2025 -8:00 Vanc P%sT 1987 2026 -8:00 Canada P%sT 2027Zone America/Dawson_Creek -8:00:56 - LMT 1884 2028 -8:00 Canada P%sT 1947 2029 -8:00 Vanc P%sT 1972 Aug 30 2:00 2030 -7:00 - MST 2031Zone America/Fort_Nelson -8:10:47 - LMT 1884 2032 -8:00 Vanc P%sT 1946 2033 -8:00 - PST 1947 2034 -8:00 Vanc P%sT 1987 2035 -8:00 Canada P%sT 2015 Mar 8 2:00 2036 -7:00 - MST 2037Zone America/Creston -7:46:04 - LMT 1884 2038 -7:00 - MST 1916 Oct 1 2039 -8:00 - PST 1918 Jun 2 2040 -7:00 - MST 2041 2042# Northwest Territories, Nunavut, Yukon 2043 2044# From Paul Eggert (2006-03-22): 2045# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 2046# Mathew Englander (1996-10-07) gives the following refs: 2047# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 2048# c. 7 defines Yukon standard time as UTC-9.... 2049# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 2050# [https://www.canlii.org/en/ca/laws/stat/rsc-1985-c-i-21/latest/rsc-1985-c-i-21.html] 2051# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 2052# * O.I.C. 1980/02 established DST. 2053# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 2054 2055# From Brian Inglis (2015-04-14): 2056# 2057# I tried to trace the history of Yukon time and found the following 2058# regulations, giving the reference title and URL if found, regulation name, 2059# and relevant quote if available. Each regulation specifically revokes its 2060# predecessor. The final reference is to the current Interpretation Act 2061# authorizing and resulting from these regulatory changes. 2062# 2063# Only recent regulations were retrievable via Yukon government site search or 2064# index, and only some via Canadian legal sources. Other sources used include 2065# articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS 2066# Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and 2067# 1970 quoted below; each article includes current extracts from provincial 2068# and territorial ST and DST regulations at the end, summaries and details of 2069# standard times and daylight saving time at many locations across Canada, 2070# with time zone maps, tables and calculations for Canadian Sunrise, Sunset, 2071# and LMST; they also cover many countries and global locations, with a chart 2072# and table showing current Universal Time offsets, and may be useful as 2073# another source of information for 1970 and earlier. 2074# 2075# * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26, 2076# pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS) 2077# http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75: 2078# Yukon Interpretation Ordinance 2079# Yukon standard time is the local mean time at the one hundred and 2080# thirty-fifth meridian. 2081# 2082# * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.; 2083# JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System 2084# (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1: 2085# Yukon Interpretation Ordinance, 1955, Chap. 16. 2086# 2087# (1) Subject to this section, standard time shall be reckoned as nine 2088# hours behind Greenwich Time and called Yukon Standard Time. 2089# 2090# (2) Notwithstanding subsection (1), the Commissioner may make regulations 2091# varying the manner of reckoning standard time. 2092# 2093# * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance 2094# http://? - no online source found 2095# 2096# * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC, 2097# Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS) 2098# http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon 2099# Territory Commissioner's Order 1967-59 Interpretation Ordinance ... 2100# 2101# 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon 2102# Territory on 27th January, 1966, is hereby revoked. 2103# 2104# 2. Yukon (East) Standard Time as defined by section 36 of the 2105# Interpretation Ordinance from and after mid-night on the 28th day of May, 2106# 1967 shall be reckoned in the same manner as Pacific Standard Time, that 2107# is to say, eight hours behind Greenwich Time in the area of the Yukon 2108# Territory lying east of the 138th degree longitude west. 2109# 2110# 3. In the remainder of the Territory, lying west of the 138th degree 2111# longitude west, Yukon (West) Standard Time shall be reckoned as nine 2112# hours behind Greenwich Time. 2113# 2114# * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214 2115# https://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html 2116# C.O. 1973/214 INTERPRETATION ACT ... 2117# 2118# 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby 2119# revoked. 2120# 2121# 2. Yukon Standard Time as defined by section 36 of the Interpretation 2122# Act from and after midnight on the twenty-eighth day of October, 1973 2123# shall be reckoned in the same manner as Pacific Standard Time, that is 2124# to say eight hours behind Greenwich Time. 2125# 2126# * O.I.C. 1980/02 INTERPRETATION ACT 2127# http://? - no online source found 2128# 2129# * Yukon Daylight Saving Time, YOIC 1987/56 2130# https://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html 2131# O.I.C. 1987/056 INTERPRETATION ACT ... 2132# 2133# In every year between 2134# (a) two o'clock in the morning in the first Sunday in April, and 2135# (b) two o'clock in the morning in the last Sunday in October, 2136# Standard Time shall be reckoned as seven hours behind Greenwich Time and 2137# called Yukon Daylight Saving Time. 2138# ... 2139# Dated ... 9th day of March, A.D., 1987. 2140# 2141# * Yukon Daylight Saving Time 2006, YOIC 2006/127 2142# https://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html 2143# O.I.C. 2006/127 INTERPRETATION ACT ... 2144# 2145# 1. In Yukon each year the time for general purposes shall be 7 hours 2146# behind Greenwich mean time during the period commencing at two o'clock 2147# in the forenoon on the second Sunday of March and ending at two o'clock 2148# in the forenoon on the first Sunday of November and shall be called 2149# Yukon Daylight Saving Time. 2150# 2151# 2. Order-in-Council 1987/56 is revoked. 2152# 2153# 3. This order comes into force January 1, 2007. 2154# 2155# * Interpretation Act, RSY 2002, c 125 2156# https://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html 2157 2158# From Rives McDow (1999-09-04): 2159# Nunavut ... moved ... to incorporate the whole territory into one time zone. 2160# Nunavut moves to single time zone Oct. 31 2161# http://www.nunatsiaq.com/nunavut/nvt90903_13.html 2162# 2163# From Antoine Leca (1999-09-06): 2164# We then need to create a new timezone for the Kitikmeot region of Nunavut 2165# to differentiate it from the Yellowknife region. 2166 2167# From Paul Eggert (1999-09-20): 2168# Basic Facts: The New Territory 2169# http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html 2170# (1999) reports that Pangnirtung operates on eastern time, 2171# and that Coral Harbour does not observe DST. We don't know when 2172# Pangnirtung switched to eastern time; we'll guess 1995. 2173 2174# From Rives McDow (1999-11-08): 2175# On October 31, when the rest of Nunavut went to Central time, 2176# Pangnirtung wobbled. Here is the result of their wobble: 2177# 2178# The following businesses and organizations in Pangnirtung use Central Time: 2179# 2180# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 2181# Eastern Arctic National Parks, A & D Specialist 2182# 2183# The following businesses and organizations in Pangnirtung use Eastern Time: 2184# 2185# Hamlet office, All other businesses, Both schools, Airport operator 2186# 2187# This has made for an interesting situation there, which warranted the news. 2188# No one there that I spoke with seems concerned, or has plans to 2189# change the local methods of keeping time, as it evidently does not 2190# really interfere with any activities or make things difficult locally. 2191# They plan to celebrate New Year's turn-over twice, one hour apart, 2192# so it appears that the situation will last at least that long. 2193# The Nunavut Intergovernmental Affairs hopes that they will "come to 2194# their senses", but the locals evidently don't see any problem with 2195# the current state of affairs. 2196 2197# From Michaela Rodrigue, writing in the 2198# Nunatsiaq News (1999-11-19): 2199# http://www.nunatsiaqonline.ca/archives/nunavut991130/nvt91119_17.html 2200# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 2201# central - or Nunavut time - for government offices, and eastern time 2202# for municipal offices and schools.... Igloolik [was similar but then] 2203# made the switch to central time on Saturday, Nov. 6. 2204 2205# From Paul Eggert (2000-10-02): 2206# Matthews and Vincent (1998) say the following, but we lack histories 2207# for these potential new Zones. 2208# 2209# The Canadian Forces station at Alert uses Eastern Time while the 2210# handful of residents at the Eureka weather station [in the Central 2211# zone] skip daylight savings. Baffin Island, which is crossed by the 2212# Central, Eastern and Atlantic Time zones only uses Eastern Time. 2213# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 2214# Central Time and Southampton Island [in the Central zone] is not 2215# required to use daylight savings. 2216 2217# From <http://www.nunatsiaqonline.ca/archives/nunavut001130/nvt21110_02.html> 2218# Nunavut now has two time zones (2000-11-10): 2219# The Nunavut government would allow its employees in Kugluktuk and 2220# Cambridge Bay to operate on central time year-round, putting them 2221# one hour behind the rest of Nunavut for six months during the winter. 2222# At the end of October the two communities had rebelled against 2223# Nunavut's unified time zone, refusing to shift to eastern time with 2224# the rest of the territory for the winter. Cambridge Bay remained on 2225# central time, while Kugluktuk, even farther west, reverted to 2226# mountain time, which they had used before the advent of Nunavut's 2227# unified time zone in 1999. 2228# 2229# From Rives McDow (2001-01-20), quoting the Nunavut government: 2230# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 2231 2232# From Paul Eggert (2000-12-04): 2233# Let's just keep track of the official times for now. 2234 2235# From Rives McDow (2001-03-07): 2236# The premier of Nunavut has issued a ministerial statement advising 2237# that effective 2001-04-01, the territory of Nunavut will revert 2238# back to three time zones (mountain, central, and eastern). Of the 2239# cities in Nunavut, Coral Harbor is the only one that I know of that 2240# has said it will not observe dst, staying on EST year round. I'm 2241# checking for more info, and will get back to you if I come up with 2242# more. 2243# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 2244 2245# From Gwillim Law (2005-05-21): 2246# According to ... 2247# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 2248# (from a 1998 Canadian Geographic article), the de facto and de jure time 2249# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 2250# round. Using Google, it's easy to find other websites that confirm this. 2251# I wasn't able to find how far back this time regimen goes, but since it 2252# predates the creation of Nunavut, it probably goes back many years.... 2253# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 2254# 2255# From Paul Eggert (2014-10-17): 2256# For lack of better information, assume that Southampton Island observed 2257# daylight saving only during wartime. Gwillim Law's email also 2258# mentioned maps now maintained by National Research Council Canada; 2259# see above for an up-to-date link. 2260 2261# From Chris Walton (2007-03-01): 2262# ... the community of Resolute (located on Cornwallis Island in 2263# Nunavut) moved from Central Time to Eastern Time last November. 2264# Basically the community did not change its clocks at the end of 2265# daylight saving.... 2266# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html 2267 2268# From Chris Walton (2011-03-21): 2269# Back in 2007 I initiated the creation of a new "zone file" for Resolute 2270# Bay. Resolute Bay is a small community located about 900km north of 2271# the Arctic Circle. The zone file was required because Resolute Bay had 2272# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007. 2273# 2274# According to new information which I received last week, Resolute Bay 2275# went back to using UTC-6 in the winter of 2007-2008... 2276# 2277# On March 11/2007 most of Canada went onto daylight saving. On March 2278# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I 2279# talked to somebody that was both knowledgeable and helpful. I was able 2280# to confirm that Resolute Bay was still operating on UTC-5. It was 2281# explained to me that Resolute Bay had been on the Eastern Time zone 2282# (EST) in the winter, and was now back on the Central Time zone (CDT). 2283# i.e. the time zone had changed twice in the last year but the clocks 2284# had not moved. The residents had to know which time zone they were in 2285# so they could follow the correct TV schedule... 2286# 2287# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I 2288# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature 2289# of the phone call, I decided to seek out an alternate source of 2290# information. I found an e-mail address for somebody by the name of 2291# Stephanie Adams whose job was listed as "Inns North Support Officer for 2292# Arctic Co-operatives." I was under the impression that Stephanie lived 2293# and worked in Resolute Bay... 2294# 2295# On March 14/2011 I phoned the hamlet office again. I was told that 2296# Resolute Bay had been using Central Standard Time over the winter of 2297# 2010-2011 and that the clocks had therefore been moved one hour ahead 2298# on March 13/2011. The person I talked to was aware that Resolute Bay 2299# had previously experimented with Eastern Standard Time but he could not 2300# tell me when the practice had stopped. 2301# 2302# On March 17/2011 I searched the Web to find an e-mail address of 2303# somebody that might be able to tell me exactly when Resolute Bay went 2304# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz 2305# used to be the mayor of Resolute Bay and he apparently owns half the 2306# businesses including "South Camp Inn." This website has some info on 2307# Aziz: 2308# http://www.uphere.ca/node/493 2309# 2310# I sent Aziz an e-mail asking when Resolute Bay had stopped using 2311# Eastern Standard Time. 2312# 2313# Aziz responded quickly with this: "hi, The time was not changed for the 2314# 1 year only, the following year, the community went back to the old way 2315# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in 2316# the winter Zulu plus 6 hrs" 2317# 2318# This of course conflicted with everything I had ascertained in November 2008. 2319# 2320# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz 2321# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You 2322# may want to check with the weather office in Resolute Bay or do a 2323# search on the weather through Env. Canada. web site" 2324# 2325# If I had realized the Stephanie did not live in Resolute Bay I would 2326# never have contacted her. I now believe that all the information I 2327# obtained in November 2008 should be ignored... 2328# I apologize for reporting incorrect information in 2008. 2329 2330# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2331Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 2332Rule NT_YK 1918 only - Oct 27 2:00 0 S 2333Rule NT_YK 1919 only - May 25 2:00 1:00 D 2334Rule NT_YK 1919 only - Nov 1 0:00 0 S 2335Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 2336Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 2337Rule NT_YK 1945 only - Sep 30 2:00 0 S 2338Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 2339Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 2340Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 2341Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S 2342Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D 2343# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2344# aka Panniqtuuq 2345Zone America/Pangnirtung 0 - -00 1921 # trading post est. 2346 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 2347 -5:00 Canada E%sT 1999 Oct 31 2:00 2348 -6:00 Canada C%sT 2000 Oct 29 2:00 2349 -5:00 Canada E%sT 2350# formerly Frobisher Bay 2351Zone America/Iqaluit 0 - -00 1942 Aug # Frobisher Bay est. 2352 -5:00 NT_YK E%sT 1999 Oct 31 2:00 2353 -6:00 Canada C%sT 2000 Oct 29 2:00 2354 -5:00 Canada E%sT 2355# aka Qausuittuq 2356Zone America/Resolute 0 - -00 1947 Aug 31 # Resolute founded 2357 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2358 -5:00 - EST 2001 Apr 1 3:00 2359 -6:00 Canada C%sT 2006 Oct 29 2:00 2360 -5:00 - EST 2007 Mar 11 3:00 2361 -6:00 Canada C%sT 2362# aka Kangiqiniq 2363Zone America/Rankin_Inlet 0 - -00 1957 # Rankin Inlet founded 2364 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2365 -5:00 - EST 2001 Apr 1 3:00 2366 -6:00 Canada C%sT 2367# aka Iqaluktuuttiaq 2368Zone America/Cambridge_Bay 0 - -00 1920 # trading post est.? 2369 -7:00 NT_YK M%sT 1999 Oct 31 2:00 2370 -6:00 Canada C%sT 2000 Oct 29 2:00 2371 -5:00 - EST 2000 Nov 5 0:00 2372 -6:00 - CST 2001 Apr 1 3:00 2373 -7:00 Canada M%sT 2374Zone America/Yellowknife 0 - -00 1935 # Yellowknife founded? 2375 -7:00 NT_YK M%sT 1980 2376 -7:00 Canada M%sT 2377Zone America/Inuvik 0 - -00 1953 # Inuvik founded 2378 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 2379 -7:00 NT_YK M%sT 1980 2380 -7:00 Canada M%sT 2381Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 2382 -9:00 NT_YK Y%sT 1967 May 28 0:00 2383 -8:00 NT_YK P%sT 1980 2384 -8:00 Canada P%sT 2385Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 2386 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 2387 -8:00 NT_YK P%sT 1980 2388 -8:00 Canada P%sT 2389 2390 2391############################################################################### 2392 2393# Mexico 2394 2395# From Paul Eggert (2014-12-07): 2396# The Investigation and Analysis Service of the 2397# Mexican Library of Congress (MLoC) has published a 2398# history of Mexican local time (in Spanish) 2399# http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm 2400# 2401# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC. 2402# (In all cases we go with the MLoC.) 2403# S&P report that Baja was at -8:00 in 1922/1923. 2404# S&P say the 1930 transition in Baja was 1930-11-16. 2405# S&P report no DST during summer 1931. 2406# S&P report a transition at 1932-03-30 23:00, not 1932-04-01. 2407 2408# From Gwillim Law (2001-02-20): 2409# There are some other discrepancies between the Decrees page and the 2410# tz database. I think they can best be explained by supposing that 2411# the researchers who prepared the Decrees page failed to find some of 2412# the relevant documents. 2413 2414# From Alan Perry (1996-02-15): 2415# A guy from our Mexico subsidiary finally found the Presidential Decree 2416# outlining the timezone changes in Mexico. 2417# 2418# ------------- Begin Forwarded Message ------------- 2419# 2420# I finally got my hands on the Official Presidential Decree that sets up the 2421# rules for the DST changes. The rules are: 2422# 2423# 1. The country is divided in 3 timezones: 2424# - Baja California Norte (the Mexico/BajaNorte TZ) 2425# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 2426# - The rest of the country (the Mexico/General TZ) 2427# 2428# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 2429# at 2:00 AM, the times in each zone are as follows: 2430# BajaNorte: GMT+7 2431# BajaSur: GMT+6 2432# General: GMT+5 2433# 2434# 3. The rest of the year, the times are as follows: 2435# BajaNorte: GMT+8 2436# BajaSur: GMT+7 2437# General: GMT+6 2438# 2439# The Decree was published in Mexico's Official Newspaper on January 4th. 2440# 2441# -------------- End Forwarded Message -------------- 2442# From Paul Eggert (1996-06-12): 2443# For an English translation of the decree, see 2444# "Diario Oficial: Time Zone Changeover" (1996-01-04). 2445# http://mexico-travel.com/extra/timezone_eng.html 2446 2447# From Rives McDow (1998-10-08): 2448# The State of Quintana Roo has reverted back to central STD and DST times 2449# (i.e. UTC -0600 and -0500 as of 1998-08-02). 2450 2451# From Rives McDow (2000-01-10): 2452# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 2453# zone 5 hours from the International Date Line, and will not observe daylight 2454# savings time so as to stay on the same time zone as the southern part of 2455# Arizona year round. 2456 2457# From Jesper Nørgaard, translating 2458# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 2459# In Oaxaca, the 55.000 teachers from the Section 22 of the National 2460# Syndicate of Education Workers, refuse to apply daylight saving each 2461# year, so that the more than 10,000 schools work at normal hour the 2462# whole year. 2463 2464# From Gwillim Law (2001-01-19): 2465# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 2466# (translated):... 2467# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 2468# that Summer Time will be reduced from seven to five months, starting 2469# this year.... 2470# http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001 2471# [translated], says "summer time will ... take effect on the first Sunday 2472# in May, and end on the last Sunday of September. 2473 2474# From Arthur David Olson (2001-01-25): 2475# The 2001-01-24 traditional Washington Post contained the page one 2476# story "Timely Issue Divides Mexicans."... 2477# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 2478# ... Mexico City Mayor López Obrador "...is threatening to keep 2479# Mexico City and its 20 million residents on a different time than 2480# the rest of the country..." In particular, López Obrador would abolish 2481# observation of Daylight Saving Time. 2482 2483# Official statute published by the Energy Department 2484# http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre 2485# (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 2486# and Sonora with no DST. This was reported by Jesper Nørgaard (2001-02-03). 2487 2488# From Paul Eggert (2001-03-03): 2489# 2490# http://www.latimes.com/news/nation/20010303/t000018766.html 2491# James F. Smith writes in today's LA Times 2492# * Sonora will continue to observe standard time. 2493# * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that 2494# the Federal District will not adopt DST. 2495# * 4 of 16 district leaders announced they'll ignore the decree. 2496# * The decree does not affect federal-controlled facilities including 2497# the airport, banks, hospitals, and schools. 2498# 2499# For now we'll assume that the Federal District will bow to federal rules. 2500 2501# From Jesper Nørgaard (2001-04-01): 2502# I found some references to the Mexican application of daylight 2503# saving, which modifies what I had already sent you, stating earlier 2504# that a number of northern Mexican states would go on daylight 2505# saving. The modification reverts this to only cover Baja California 2506# (Norte), while all other states (except Sonora, who has no daylight 2507# saving all year) will follow the original decree of president 2508# Vicente Fox, starting daylight saving May 6, 2001 and ending 2509# September 30, 2001. 2510# References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp> 2511# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 2512 2513# From Reuters (2001-09-04): 2514# Mexico's Supreme Court on Tuesday declared that daylight savings was 2515# unconstitutional in Mexico City, creating the possibility the 2516# capital will be in a different time zone from the rest of the nation 2517# next year.... The Supreme Court's ruling takes effect at 2:00 2518# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 2519# standard time. "This is so residents of the Federal District are not 2520# subject to unexpected time changes," a statement from the court said. 2521 2522# From Jesper Nørgaard Welen (2002-03-12): 2523# ... consulting my local grocery store(!) and my coworkers, they all insisted 2524# that a new decision had been made to reinstate US style DST in Mexico.... 2525# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 2526# confirms this. Sonora as usual is the only state where DST is not applied. 2527 2528# From Steffen Thorsen (2009-12-28): 2529# 2530# Steffen Thorsen wrote: 2531# > Mexico's House of Representatives has approved a proposal for northern 2532# > Mexico's border cities to share the same daylight saving schedule as 2533# > the United States. 2534# Now this has passed both the Congress and the Senate, so starting from 2535# 2010, some border regions will be the same: 2536# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/ 2537# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939 2538# (Spanish) 2539# 2540# Could not find the new law text, but the proposed law text changes are here: 2541# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf 2542# (Gaceta Parlamentaria) 2543# 2544# There is also a list of the votes here: 2545# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html 2546# 2547# Our page: 2548# https://www.timeanddate.com/news/time/north-mexico-dst-change.html 2549 2550# From Arthur David Olson (2010-01-20): 2551# The page 2552# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2553# includes this text: 2554# En los municipios fronterizos de Tijuana y Mexicali en Baja California; 2555# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila; 2556# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en 2557# Tamaulipas, la aplicación de este horario estacional surtirá efecto 2558# desde las dos horas del segundo domingo de marzo y concluirá a las dos 2559# horas del primer domingo de noviembre. 2560# En los municipios fronterizos que se encuentren ubicados en la franja 2561# fronteriza norte en el territorio comprendido entre la línea 2562# internacional y la línea paralela ubicada a una distancia de veinte 2563# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el 2564# interior del país, la aplicación de este horario estacional surtirá 2565# efecto desde las dos horas del segundo domingo de marzo y concluirá a 2566# las dos horas del primer domingo de noviembre. 2567 2568# From Steffen Thorsen (2014-12-08), translated by Gwillim Law: 2569# The Mexican state of Quintana Roo will likely change to EST in 2015. 2570# 2571# http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo 2572# "With this change, the time conflict that has existed between the municipios 2573# of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an 2574# end. The latter declared itself in rebellion 15 years ago when a time change 2575# was initiated in Mexico, and since then it has refused to change its time 2576# zone along with the rest of the country." 2577# 2578# From Steffen Thorsen (2015-01-14), translated by Gwillim Law: 2579# http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html 2580# "...the new time zone will come into effect at two o'clock on the first Sunday 2581# of February, when we will have to advance the clock one hour from its current 2582# time..." 2583# Also, the new zone will not use DST. 2584# 2585# From Carlos Raúl Perasso (2015-02-02): 2586# The decree that modifies the Mexican Hour System Law has finally 2587# been published at the Diario Oficial de la Federación 2588# http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015 2589# It establishes 5 zones for Mexico: 2590# 1- Zona Centro (Central Zone): Corresponds to longitude 90 W, 2591# includes most of Mexico, excluding what's mentioned below. 2592# 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the 2593# states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía 2594# de Banderas which lies in Central Zone); Sinaloa and Sonora. 2595# 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the 2596# state of Baja California. 2597# 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state 2598# of Quintana Roo. 2599# 5- The islands, reefs and keys shall take their timezone from the 2600# longitude they are located at. 2601 2602# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2603Rule Mexico 1939 only - Feb 5 0:00 1:00 D 2604Rule Mexico 1939 only - Jun 25 0:00 0 S 2605Rule Mexico 1940 only - Dec 9 0:00 1:00 D 2606Rule Mexico 1941 only - Apr 1 0:00 0 S 2607Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 2608Rule Mexico 1944 only - May 1 0:00 0 S 2609Rule Mexico 1950 only - Feb 12 0:00 1:00 D 2610Rule Mexico 1950 only - Jul 30 0:00 0 S 2611Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 2612Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 2613Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 2614Rule Mexico 2001 only - Sep lastSun 2:00 0 S 2615Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 2616Rule Mexico 2002 max - Oct lastSun 2:00 0 S 2617# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2618# Quintana Roo; represented by Cancún 2619Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 2620 -6:00 - CST 1981 Dec 23 2621 -5:00 Mexico E%sT 1998 Aug 2 2:00 2622 -6:00 Mexico C%sT 2015 Feb 1 2:00 2623 -5:00 - EST 2624# Campeche, Yucatán; represented by Mérida 2625Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 2626 -6:00 - CST 1981 Dec 23 2627 -5:00 - EST 1982 Dec 2 2628 -6:00 Mexico C%sT 2629# Coahuila, Nuevo León, Tamaulipas (near US border) 2630# This includes the following municipalities: 2631# in Coahuila: Ocampo, Acuña, Zaragoza, Jiménez, Piedras Negras, Nava, 2632# Guerrero, Hidalgo. 2633# in Nuevo León: Anáhuac, Los Aldama. 2634# in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo, 2635# Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso, Matamoros. 2636# See: Inicia mañana Horario de Verano en zona fronteriza, El Universal, 2637# 2016-03-12 2638# http://www.eluniversal.com.mx/articulo/estados/2016/03/12/inicia-manana-horario-de-verano-en-zona-fronteriza 2639Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00 2640 -6:00 - CST 1988 2641 -6:00 US C%sT 1989 2642 -6:00 Mexico C%sT 2010 2643 -6:00 US C%sT 2644# Durango; Coahuila, Nuevo León, Tamaulipas (away from US border) 2645Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 2646 -6:00 - CST 1988 2647 -6:00 US C%sT 1989 2648 -6:00 Mexico C%sT 2649# Central Mexico 2650Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 2651 -7:00 - MST 1927 Jun 10 23:00 2652 -6:00 - CST 1930 Nov 15 2653 -7:00 - MST 1931 May 1 23:00 2654 -6:00 - CST 1931 Oct 2655 -7:00 - MST 1932 Apr 1 2656 -6:00 Mexico C%sT 2001 Sep 30 2:00 2657 -6:00 - CST 2002 Feb 20 2658 -6:00 Mexico C%sT 2659# Chihuahua (near US border) 2660# This includes the municipalities of Janos, Ascensión, Juárez, Guadalupe, 2661# Práxedis G Guerrero, Coyame del Sotol, Ojinaga, and Manuel Benavides. 2662# (See the 2016-03-12 El Universal source mentioned above.) 2663Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20 2664 -7:00 - MST 1927 Jun 10 23:00 2665 -6:00 - CST 1930 Nov 15 2666 -7:00 - MST 1931 May 1 23:00 2667 -6:00 - CST 1931 Oct 2668 -7:00 - MST 1932 Apr 1 2669 -6:00 - CST 1996 2670 -6:00 Mexico C%sT 1998 2671 -6:00 - CST 1998 Apr Sun>=1 3:00 2672 -7:00 Mexico M%sT 2010 2673 -7:00 US M%sT 2674# Chihuahua (away from US border) 2675Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 2676 -7:00 - MST 1927 Jun 10 23:00 2677 -6:00 - CST 1930 Nov 15 2678 -7:00 - MST 1931 May 1 23:00 2679 -6:00 - CST 1931 Oct 2680 -7:00 - MST 1932 Apr 1 2681 -6:00 - CST 1996 2682 -6:00 Mexico C%sT 1998 2683 -6:00 - CST 1998 Apr Sun>=1 3:00 2684 -7:00 Mexico M%sT 2685# Sonora 2686Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 2687 -7:00 - MST 1927 Jun 10 23:00 2688 -6:00 - CST 1930 Nov 15 2689 -7:00 - MST 1931 May 1 23:00 2690 -6:00 - CST 1931 Oct 2691 -7:00 - MST 1932 Apr 1 2692 -6:00 - CST 1942 Apr 24 2693 -7:00 - MST 1949 Jan 14 2694 -8:00 - PST 1970 2695 -7:00 Mexico M%sT 1999 2696 -7:00 - MST 2697 2698# From Alexander Krivenyshev (2010-04-21): 2699# According to news, Bahía de Banderas (Mexican state of Nayarit) 2700# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to 2701# share the same time zone as nearby city Puerto Vallarta, Jalisco). 2702# 2703# (Spanish) 2704# Bahía de Banderas homologa su horario al del centro del 2705# país, a partir de este domingo 2706# http://www.nayarit.gob.mx/notes.asp?id=20748 2707# 2708# Bahía de Banderas homologa su horario con el del Centro del 2709# País 2710# 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 2711# 2712# (English) 2713# Puerto Vallarta and Bahía de Banderas: One Time Zone 2714# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml 2715# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html 2716# 2717# "Mexico's Senate approved the amendments to the Mexican Schedule System that 2718# will allow Bahía de Banderas and Puerto Vallarta to share the same time 2719# zone ..." 2720# Baja California Sur, Nayarit, Sinaloa 2721 2722# From Arthur David Olson (2010-05-01): 2723# Use "Bahia_Banderas" to keep the name to fourteen characters. 2724 2725# Mazatlán 2726Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 2727 -7:00 - MST 1927 Jun 10 23:00 2728 -6:00 - CST 1930 Nov 15 2729 -7:00 - MST 1931 May 1 23:00 2730 -6:00 - CST 1931 Oct 2731 -7:00 - MST 1932 Apr 1 2732 -6:00 - CST 1942 Apr 24 2733 -7:00 - MST 1949 Jan 14 2734 -8:00 - PST 1970 2735 -7:00 Mexico M%sT 2736 2737# Bahía de Banderas 2738Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00 2739 -7:00 - MST 1927 Jun 10 23:00 2740 -6:00 - CST 1930 Nov 15 2741 -7:00 - MST 1931 May 1 23:00 2742 -6:00 - CST 1931 Oct 2743 -7:00 - MST 1932 Apr 1 2744 -6:00 - CST 1942 Apr 24 2745 -7:00 - MST 1949 Jan 14 2746 -8:00 - PST 1970 2747 -7:00 Mexico M%sT 2010 Apr 4 2:00 2748 -6:00 Mexico C%sT 2749 2750# Baja California 2751Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 2752 -7:00 - MST 1924 2753 -8:00 - PST 1927 Jun 10 23:00 2754 -7:00 - MST 1930 Nov 15 2755 -8:00 - PST 1931 Apr 1 2756 -8:00 1:00 PDT 1931 Sep 30 2757 -8:00 - PST 1942 Apr 24 2758 -8:00 1:00 PWT 1945 Aug 14 23:00u 2759 -8:00 1:00 PPT 1945 Nov 12 # Peace 2760 -8:00 - PST 1948 Apr 5 2761 -8:00 1:00 PDT 1949 Jan 14 2762 -8:00 - PST 1954 2763 -8:00 CA P%sT 1961 2764 -8:00 - PST 1976 2765 -8:00 US P%sT 1996 2766 -8:00 Mexico P%sT 2001 2767 -8:00 US P%sT 2002 Feb 20 2768 -8:00 Mexico P%sT 2010 2769 -8:00 US P%sT 2770# From Paul Eggert (2006-03-22): 2771# Formerly there was an America/Ensenada zone, which differed from 2772# America/Tijuana only in that it did not observe DST from 1976 2773# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say 2774# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports 2775# that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and 2776# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that 2777# DST-observance was a town-by-town matter back then. This concerns 2778# data after 1970 so most likely there should be at least one Zone 2779# other than America/Tijuana for Baja, but it's not clear yet what its 2780# name or contents should be. 2781# 2782# From Paul Eggert (2015-10-08): 2783# Formerly there was an America/Santa_Isabel zone, but this appears to 2784# have come from a misreading of 2785# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2786# It has been moved to the 'backward' file. 2787# 2788# 2789# Revillagigedo Is 2790# no information 2791 2792############################################################################### 2793 2794# Anguilla 2795# Antigua and Barbuda 2796# See America/Port_of_Spain. 2797 2798# Bahamas 2799# 2800# For 1899 Milne gives -5:09:29.5; round that. 2801# 2802# From Sue Williams (2006-12-07): 2803# The Bahamas announced about a month ago that they plan to change their DST 2804# rules to sync with the U.S. starting in 2007.... 2805# http://www.jonesbahamas.com/?c=45&a=10412 2806 2807# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2808Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S 2809Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D 2810# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2811Zone America/Nassau -5:09:30 - LMT 1912 Mar 2 2812 -5:00 Bahamas E%sT 1976 2813 -5:00 US E%sT 2814 2815# Barbados 2816 2817# For 1899 Milne gives -3:58:29.2; round that. 2818 2819# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2820Rule Barb 1977 only - Jun 12 2:00 1:00 D 2821Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 2822Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 2823Rule Barb 1979 only - Sep 30 2:00 0 S 2824Rule Barb 1980 only - Sep 25 2:00 0 S 2825# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2826Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown 2827 -3:58:29 - BMT 1932 # Bridgetown Mean Time 2828 -4:00 Barb A%sT 2829 2830# Belize 2831# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger. 2832# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2833Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 -0530 2834Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 CST 2835Rule Belize 1973 only - Dec 5 0:00 1:00 CDT 2836Rule Belize 1974 only - Feb 9 0:00 0 CST 2837Rule Belize 1982 only - Dec 18 0:00 1:00 CDT 2838Rule Belize 1983 only - Feb 12 0:00 0 CST 2839# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2840Zone America/Belize -5:52:48 - LMT 1912 Apr 2841 -6:00 Belize %s 2842 2843# Bermuda 2844 2845# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower, 2846# Bermuda dockyard, Ireland I; round that. 2847 2848# From Dan Jones, reporting in The Royal Gazette (2006-06-26): 2849 2850# Next year, however, clocks in the US will go forward on the second Sunday 2851# in March, until the first Sunday in November. And, after the Time Zone 2852# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on 2853# Friday, the same thing will happen in Bermuda. 2854# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135 2855 2856# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2857Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton 2858 -4:00 - AST 1974 Apr 28 2:00 2859 -4:00 Canada A%sT 1976 2860 -4:00 US A%sT 2861 2862# Cayman Is 2863# See America/Panama. 2864 2865# Costa Rica 2866 2867# Milne gives -5:36:13.3 as San José mean time; round to nearest. 2868 2869# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2870Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 2871Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 2872Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 2873# IATA SSIM (1991-09) says the following was at 1:00; 2874# go with Shanks & Pottenger. 2875Rule CR 1991 only - Jul 1 0:00 0 S 2876Rule CR 1992 only - Mar 15 0:00 0 S 2877# There are too many San Josés elsewhere, so we'll use 'Costa Rica'. 2878# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2879Zone America/Costa_Rica -5:36:13 - LMT 1890 # San José 2880 -5:36:13 - SJMT 1921 Jan 15 # San José Mean Time 2881 -6:00 CR C%sT 2882# Coco 2883# no information; probably like America/Costa_Rica 2884 2885# Cuba 2886 2887# From Paul Eggert (2013-02-21): 2888# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57 2889# for the port, and -5:30 for meteorological observations. 2890# For now, stick with Shanks & Pottenger. 2891 2892# From Arthur David Olson (1999-03-29): 2893# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 2894# the Cuban National Team and the Baltimore Orioles was carried live on 2895# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 2896# During the game, play-by-play announcer Jim Hunter noted that 2897# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 2898# Time today." (The "two hour" remark referred to losing one hour of 2899# sleep on 1999-03-28 - when the announcers were in Cuba as it switched 2900# to DST - and one more hour on 1999-04-04 - when the announcers will have 2901# returned to Baltimore, which switches on that date.) 2902 2903# From Steffen Thorsen (2013-11-11): 2904# DST start in Cuba in 2004 ... does not follow the same rules as the 2905# years before. The correct date should be Sunday 2004-03-28 00:00 ... 2906# https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html 2907 2908# From Evert van der Veer via Steffen Thorsen (2004-10-28): 2909# Cuba is not going back to standard time this year. 2910# From Paul Eggert (2006-03-22): 2911# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 2912# says that it's due to a problem at the Antonio Guiteras 2913# thermoelectric plant, and says "This October there will be no return 2914# to normal hours (after daylight saving time)". 2915# For now, let's assume that it's a temporary measure. 2916 2917# From Carlos A. Carnero Delgado (2005-11-12): 2918# This year (just like in 2004-2005) there's no change in time zone 2919# adjustment in Cuba. We will stay in daylight saving time: 2920# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html 2921 2922# From Jesper Nørgaard Welen (2006-10-21): 2923# An article in GRANMA INTERNACIONAL claims that Cuba will end 2924# the 3 years of permanent DST next weekend, see 2925# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html 2926# "On Saturday night, October 28 going into Sunday, October 29, at 01:00, 2927# watches should be set back one hour - going back to 00:00 hours - returning 2928# to the normal schedule.... 2929 2930# From Paul Eggert (2007-03-02): 2931# <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday, 2932# says Cuban clocks will advance at midnight on March 10. 2933# For lack of better information, assume Cuba will use US rules, 2934# except that it switches at midnight standard time as usual. 2935# 2936# From Steffen Thorsen (2007-10-25): 2937# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week 2938# earlier - on the last Sunday of October, just like in 2006. 2939# 2940# He supplied these references: 2941# 2942# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES 2943# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm 2944# 2945# From Alex Krivenyshev (2007-10-25): 2946# Here is also article from Granma (Cuba): 2947# 2948# Regirá el Horario Normal desde el próximo domingo 28 de octubre 2949# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html 2950# 2951# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html 2952 2953# From Arthur David Olson (2008-03-09): 2954# I'm in Maryland which is now observing United States Eastern Daylight 2955# Time. At 9:44 local time I used RealPlayer to listen to 2956# http://media.enet.cu/radioreloj 2957# a Cuban information station, and heard 2958# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"), 2959# indicating that Cuba is still on standard time. 2960 2961# From Steffen Thorsen (2008-03-12): 2962# It seems that Cuba will start DST on Sunday, 2007-03-16... 2963# It was announced yesterday, according to this source (in Spanish): 2964# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm 2965# 2966# Some more background information is posted here: 2967# https://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html 2968# 2969# The article also says that Cuba has been observing DST since 1963, 2970# while Shanks (and tzdata) has 1965 as the first date (except in the 2971# 1940's). Many other web pages in Cuba also claim that it has been 2972# observed since 1963, but with the exception of 1970 - an exception 2973# which is not present in tzdata/Shanks. So there is a chance we need to 2974# change some historic records as well. 2975# 2976# One example: 2977# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm 2978 2979# From Jesper Nørgaard Welen (2008-03-13): 2980# The Cuban time change has just been confirmed on the most authoritative 2981# web site, the Granma. Please check out 2982# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html 2983# 2984# Basically as expected after Steffen Thorsen's information, the change 2985# will take place midnight between Saturday and Sunday. 2986 2987# From Arthur David Olson (2008-03-12): 2988# Assume Sun>=15 (third Sunday) going forward. 2989 2990# From Alexander Krivenyshev (2009-03-04) 2991# According to the Radio Reloj - Cuba will start Daylight Saving Time on 2992# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009- 2993# not on midnight March 14 / March 15 as previously thought. 2994# 2995# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html 2996# (in Spanish) 2997 2998# From Arthur David Olson (2009-03-09) 2999# I listened over the Internet to 3000# http://media.enet.cu/readioreloj 3001# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the 3002# the time was announced as "diez cinco" - the same time as here, indicating 3003# that has indeed switched to DST. Assume second Sunday from 2009 forward. 3004 3005# From Steffen Thorsen (2011-03-08): 3006# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00 3007# this year. Nothing about the end date known so far (if that has 3008# changed at all). 3009# 3010# Source: 3011# http://granma.co.cu/2011/03/08/nacional/artic01.html 3012# 3013# Our info: 3014# https://www.timeanddate.com/news/time/cuba-starts-dst-2011.html 3015# 3016# From Steffen Thorsen (2011-10-30) 3017# Cuba will end DST two weeks later this year. Instead of going back 3018# tonight, it has been delayed to 2011-11-13 at 01:00. 3019# 3020# One source (Spanish) 3021# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html 3022# 3023# Our page: 3024# https://www.timeanddate.com/news/time/cuba-time-changes-2011.html 3025# 3026# From Steffen Thorsen (2012-03-01) 3027# According to Radio Reloj, Cuba will start DST on Midnight between March 3028# 31 and April 1. 3029# 3030# Radio Reloj has the following info (Spanish): 3031# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril 3032# 3033# Our info on it: 3034# https://www.timeanddate.com/news/time/cuba-starts-dst-2012.html 3035 3036# From Steffen Thorsen (2012-11-03): 3037# Radio Reloj and many other sources report that Cuba is changing back 3038# to standard time on 2012-11-04: 3039# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre 3040# From Paul Eggert (2012-11-03): 3041# For now, assume the future rule is first Sunday in November. 3042 3043# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3044Rule Cuba 1928 only - Jun 10 0:00 1:00 D 3045Rule Cuba 1928 only - Oct 10 0:00 0 S 3046Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 3047Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 3048Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 3049Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 3050Rule Cuba 1965 only - Jun 1 0:00 1:00 D 3051Rule Cuba 1965 only - Sep 30 0:00 0 S 3052Rule Cuba 1966 only - May 29 0:00 1:00 D 3053Rule Cuba 1966 only - Oct 2 0:00 0 S 3054Rule Cuba 1967 only - Apr 8 0:00 1:00 D 3055Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 3056Rule Cuba 1968 only - Apr 14 0:00 1:00 D 3057Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 3058Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 3059Rule Cuba 1972 1974 - Oct 8 0:00 0 S 3060Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 3061Rule Cuba 1978 only - May 7 0:00 1:00 D 3062Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 3063Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 3064Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 3065Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 3066Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 3067Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 3068Rule Cuba 1996 only - Oct 6 0:00s 0 S 3069Rule Cuba 1997 only - Oct 12 0:00s 0 S 3070Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 3071Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 3072Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D 3073Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D 3074Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S 3075Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D 3076Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D 3077Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D 3078Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D 3079Rule Cuba 2011 only - Nov 13 0:00s 0 S 3080Rule Cuba 2012 only - Apr 1 0:00s 1:00 D 3081Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S 3082Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D 3083 3084# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3085Zone America/Havana -5:29:28 - LMT 1890 3086 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 3087 -5:00 Cuba C%sT 3088 3089# Dominica 3090# See America/Port_of_Spain. 3091 3092# Dominican Republic 3093 3094# From Steffen Thorsen (2000-10-30): 3095# Enrique Morales reported to me that the Dominican Republic has changed the 3096# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 3097# http://www.listin.com.do/antes/261000/republica/princi.html 3098 3099# From Paul Eggert (2000-12-04): 3100# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 3101 3102# From Rives McDow (2000-12-01): 3103# Dominican Republic changed its mind and presidential decree on Tuesday, 3104# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 3105# Dominican Republic will be reverting to 8 hours from the International Date 3106# Line, and will not be using DST in the foreseeable future. The reason they 3107# decided to use DST was to be in synch with Puerto Rico, who was also going 3108# to implement DST. When Puerto Rico didn't implement DST, the president 3109# decided to revert. 3110 3111 3112# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3113Rule DR 1966 only - Oct 30 0:00 1:00 EDT 3114Rule DR 1967 only - Feb 28 0:00 0 EST 3115Rule DR 1969 1973 - Oct lastSun 0:00 0:30 -0430 3116Rule DR 1970 only - Feb 21 0:00 0 EST 3117Rule DR 1971 only - Jan 20 0:00 0 EST 3118Rule DR 1972 1974 - Jan 21 0:00 0 EST 3119# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3120Zone America/Santo_Domingo -4:39:36 - LMT 1890 3121 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 3122 -5:00 DR %s 1974 Oct 27 3123 -4:00 - AST 2000 Oct 29 2:00 3124 -5:00 US E%sT 2000 Dec 3 1:00 3125 -4:00 - AST 3126 3127# El Salvador 3128 3129# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3130Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 3131Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 3132# There are too many San Salvadors elsewhere, so use America/El_Salvador 3133# instead of America/San_Salvador. 3134# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3135Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 3136 -6:00 Salv C%sT 3137 3138# Grenada 3139# Guadeloupe 3140# St Barthélemy 3141# St Martin (French part) 3142# See America/Port_of_Spain. 3143 3144# Guatemala 3145# 3146# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen: 3147# Diario Co Latino, at 3148# <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>, 3149# says in an article dated 2006-04-19 that the Guatemalan government had 3150# decided on that date to advance official time by 60 minutes, to lessen the 3151# impact of the elevated cost of oil.... Daylight saving time will last from 3152# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified). 3153# From Paul Eggert (2006-06-22): 3154# The Ministry of Energy and Mines, press release CP-15/2006 3155# (2006-04-19), says DST ends at 24:00. See 3156# http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf 3157 3158# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3159Rule Guat 1973 only - Nov 25 0:00 1:00 D 3160Rule Guat 1974 only - Feb 24 0:00 0 S 3161Rule Guat 1983 only - May 21 0:00 1:00 D 3162Rule Guat 1983 only - Sep 22 0:00 0 S 3163Rule Guat 1991 only - Mar 23 0:00 1:00 D 3164Rule Guat 1991 only - Sep 7 0:00 0 S 3165Rule Guat 2006 only - Apr 30 0:00 1:00 D 3166Rule Guat 2006 only - Oct 1 0:00 0 S 3167# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3168Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 3169 -6:00 Guat C%sT 3170 3171# Haiti 3172# From Gwillim Law (2005-04-15): 3173# Risto O. Nykänen wrote me that Haiti is now on DST. 3174# I searched for confirmation, and I found a press release 3175# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 3176# <http://www.haitianconsulate.org/time.doc>. Translated from French, it says: 3177# 3178# "The Prime Minister's Communication Office notifies the public in general 3179# and the press in particular that, following a decision of the Interior 3180# Ministry and the Territorial Collectivities [I suppose that means the 3181# provinces], Haiti will move to Eastern Daylight Time in the night from next 3182# Saturday the 2nd to Sunday the 3rd. 3183# 3184# "Consequently, the Prime Minister's Communication Office wishes to inform 3185# the population that the country's clocks will be set forward one hour 3186# starting at midnight. This provision will hold until the last Saturday in 3187# October 2005. 3188# 3189# "Port-au-Prince, March 31, 2005" 3190# 3191# From Steffen Thorsen (2006-04-04): 3192# I have been informed by users that Haiti observes DST this year like 3193# last year, so the current "only" rule for 2005 might be changed to a 3194# "max" rule or to last until 2006. (Who knows if they will observe DST 3195# next year or if they will extend their DST like US/Canada next year). 3196# 3197# I have found this article about it (in French): 3198# http://www.haitipressnetwork.com/news.cfm?articleID=7612 3199# 3200# The reason seems to be an energy crisis. 3201 3202# From Stephen Colebourne (2007-02-22): 3203# Some IATA info: Haiti won't be having DST in 2007. 3204 3205# From Steffen Thorsen (2012-03-11): 3206# According to several news sources, Haiti will observe DST this year, 3207# apparently using the same start and end date as USA/Canada. 3208# So this means they have already changed their time. 3209# 3210# http://www.alterpresse.org/spip.php?article12510 3211# http://radiovision2000haiti.net/home/?p=13253 3212# 3213# From Arthur David Olson (2012-03-11): 3214# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to 3215# 3:00 a.m. rather than the traditional Haitian jump at midnight. 3216# Assume a US-style fall back as well. 3217 3218# From Steffen Thorsen (2013-03-10): 3219# It appears that Haiti is observing DST this year as well, same rules 3220# as US/Canada. They did it last year as well, and it looks like they 3221# are going to observe DST every year now... 3222# 3223# http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/ 3224# http://www.canalplushaiti.net/?p=6714 3225 3226# From Steffen Thorsen (2016-03-12): 3227# Jean Antoine, editor of www.haiti-reference.com informed us that Haiti 3228# are not going on DST this year. Several other resources confirm this: ... 3229# https://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html 3230# https://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/ 3231# http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/ 3232 3233# From Steffen Thorsen (2017-03-12): 3234# We have received 4 mails from different people telling that Haiti 3235# has started DST again today, and this source seems to confirm that, 3236# I have not been able to find a more authoritative source: 3237# https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html 3238 3239# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3240Rule Haiti 1983 only - May 8 0:00 1:00 D 3241Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 3242Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 3243# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. 3244# Go with IATA. 3245Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 3246Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 3247Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D 3248Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S 3249Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D 3250Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S 3251Rule Haiti 2017 max - Mar Sun>=8 2:00 1:00 D 3252Rule Haiti 2017 max - Nov Sun>=1 2:00 0 S 3253# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3254Zone America/Port-au-Prince -4:49:20 - LMT 1890 3255 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 3256 -5:00 Haiti E%sT 3257 3258# Honduras 3259# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1. 3260 3261# From Paul Eggert (2006-05-05): 3262# worldtimezone.com reports a 2006-05-02 Spanish-language AP article 3263# saying Honduras will start using DST midnight Saturday, effective 4 3264# months until September. La Tribuna reported today 3265# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president 3266# of Honduras, refused to back down on this. 3267 3268# From Jesper Nørgaard Welen (2006-08-08): 3269# It seems that Honduras has returned from DST to standard time this Monday at 3270# 00:00 hours (prolonging Sunday to 25 hours duration). 3271# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html 3272 3273# From Paul Eggert (2006-08-08): 3274# Also see Diario El Heraldo, The country returns to standard time (2006-08-08). 3275# http://www.elheraldo.hn/nota.php?nid=54941&sec=12 3276# It mentions executive decree 18-2006. 3277 3278# From Steffen Thorsen (2006-08-17): 3279# Honduras will observe DST from 2007 to 2009, exact dates are not 3280# published, I have located this authoritative source: 3281# http://www.presidencia.gob.hn/noticia.aspx?nId=47 3282 3283# From Steffen Thorsen (2007-03-30): 3284# http://www.laprensahn.com/pais_nota.php?id04962=7386 3285# So it seems that Honduras will not enter DST this year.... 3286 3287# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3288Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D 3289Rule Hond 1987 1988 - Sep lastSun 0:00 0 S 3290Rule Hond 2006 only - May Sun>=1 0:00 1:00 D 3291Rule Hond 2006 only - Aug Mon>=1 0:00 0 S 3292# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3293Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 3294 -6:00 Hond C%sT 3295# 3296# Great Swan I ceded by US to Honduras in 1972 3297 3298# Jamaica 3299# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an 3300# unspecified official document, and says "This time is used throughout the 3301# island". Go with Milne. Round to the nearest second as required by zic. 3302# 3303# Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but 3304# Lance Neita writes that Prime Minister Michael Manley decreed it January 5. 3305# Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that 3306# Manley's supporters associated this act with Manley's nickname "Joshua" 3307# (recall that in the Bible the sun stood still at Joshua's request), 3308# and with the Rod of Correction which Manley said he had received from 3309# Haile Selassie, Emperor of Ethiopia. See: 3310# Neita L. The politician in all of us. Jamaica Observer 2014-09-20 3311# http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647 3312# 3313# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3314Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston 3315 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3316 -5:00 - EST 1974 3317 -5:00 US E%sT 1984 3318 -5:00 - EST 3319 3320# Martinique 3321# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3322Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 3323 -4:04:20 - FFMT 1911 May # Fort-de-France MT 3324 -4:00 - AST 1980 Apr 6 3325 -4:00 1:00 ADT 1980 Sep 28 3326 -4:00 - AST 3327 3328# Montserrat 3329# See America/Port_of_Spain. 3330 3331# Nicaragua 3332# 3333# This uses Shanks & Pottenger for times before 2005. 3334# 3335# From Steffen Thorsen (2005-04-12): 3336# I've got reports from 8 different people that Nicaragua just started 3337# DST on Sunday 2005-04-10, in order to save energy because of 3338# expensive petroleum. The exact end date for DST is not yet 3339# announced, only "September" but some sites also say "mid-September". 3340# Some background information is available on the President's official site: 3341# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 3342# The Decree, no 23-2005 is available here: 3343# 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 3344# 3345# From Paul Eggert (2005-05-01): 3346# The decree doesn't say anything about daylight saving, but for now let's 3347# assume that it is daylight saving.... 3348# 3349# From Gwillim Law (2005-04-21): 3350# The Associated Press story on the time change, which can be found at 3351# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 3352# and elsewhere, says (fifth paragraph, translated from Spanish): "The last 3353# time that a change of clocks was applied to save energy was in the year 2000 3354# during the Arnoldo Alemán administration."... 3355# The northamerica file says that Nicaragua has been on UTC-6 continuously 3356# since December 1998. I wasn't able to find any details of Nicaraguan time 3357# changes in 2000. Perhaps a note could be added to the northamerica file, to 3358# the effect that we have indirect evidence that DST was observed in 2000. 3359# 3360# From Jesper Nørgaard Welen (2005-11-02): 3361# Nicaragua left DST the 2005-10-02 at 00:00 (local time). 3362# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm 3363# (2005-09-26) 3364# 3365# From Jesper Nørgaard Welen (2006-05-05): 3366# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410 3367# (my informal translation) 3368# By order of the president of the republic, Enrique Bolaños, Nicaragua 3369# advanced by sixty minutes their official time, yesterday at 2 in the 3370# morning, and will stay that way until 30th of September. 3371# 3372# From Jesper Nørgaard Welen (2006-09-30): 3373# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf 3374# My informal translation runs: 3375# The natural sun time is restored in all the national territory, in that the 3376# time is returned one hour at 01:00 am of October 1 of 2006. 3377# 3378# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3379Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 3380Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 3381Rule Nic 2005 only - Apr 10 0:00 1:00 D 3382Rule Nic 2005 only - Oct Sun>=1 0:00 0 S 3383Rule Nic 2006 only - Apr 30 2:00 1:00 D 3384Rule Nic 2006 only - Oct Sun>=1 1:00 0 S 3385# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3386Zone America/Managua -5:45:08 - LMT 1890 3387 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 3388 -6:00 - CST 1973 May 3389 -5:00 - EST 1975 Feb 16 3390 -6:00 Nic C%sT 1992 Jan 1 4:00 3391 -5:00 - EST 1992 Sep 24 3392 -6:00 - CST 1993 3393 -5:00 - EST 1997 3394 -6:00 Nic C%sT 3395 3396# Panama 3397# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3398Zone America/Panama -5:18:08 - LMT 1890 3399 -5:19:36 - CMT 1908 Apr 22 # Colón Mean Time 3400 -5:00 - EST 3401Link America/Panama America/Cayman 3402 3403# Puerto Rico 3404# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'. 3405# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3406Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 3407 -4:00 - AST 1942 May 3 3408 -4:00 US A%sT 1946 3409 -4:00 - AST 3410 3411# St Kitts-Nevis 3412# St Lucia 3413# See America/Port_of_Spain. 3414 3415# St Pierre and Miquelon 3416# There are too many St Pierres elsewhere, so we'll use 'Miquelon'. 3417# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3418Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 3419 -4:00 - AST 1980 May 3420 -3:00 - -03 1987 3421 -3:00 Canada -03/-02 3422 3423# St Vincent and the Grenadines 3424# See America/Port_of_Spain. 3425 3426# Turks and Caicos 3427# 3428# From Chris Dunn in 3429# https://bugs.debian.org/415007 3430# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the 3431# daylight saving dates for time changes have been adjusted to match 3432# the recent U.S. change of dates. 3433# 3434# From Brian Inglis (2007-04-28): 3435# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26] 3436# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three 3437# rows before that there is an out of date entry for Oct: 3438# "Eastern Standard Times Begins 2007 3439# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time" 3440# indicating that the normal ET rules are followed. 3441# 3442# From Paul Eggert (2014-08-19): 3443# The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See: 3444# http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm 3445# Model this as a switch from EST/EDT to AST ... 3446# From Chris Walton (2014-11-04): 3447# ... the TCI government appears to have delayed the switch to 3448# "permanent daylight saving time" by one year.... 3449# http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm 3450# 3451# From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen: 3452# ... agreed to the reintroduction in TCI of Daylight Saving Time (DST) 3453# during the summer months and Standard Time, also known as Local 3454# Time, during the winter months with effect from April 2018 ... 3455# https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3 3456# 3457# From Paul Eggert (2017-08-26): 3458# The date of effect of the spring 2018 change appears to be March 11, 3459# which makes more sense. See: Hamilton D. Time change back 3460# by March 2018 for TCI. Magnetic Media. 2017-08-25. 3461# http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/ 3462# 3463# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3464Zone America/Grand_Turk -4:44:32 - LMT 1890 3465 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3466 -5:00 - EST 1979 3467 -5:00 US E%sT 2015 Nov Sun>=1 2:00 3468 -4:00 - AST 2018 Mar 11 3:00 3469 -5:00 US E%sT 3470 3471# British Virgin Is 3472# Virgin Is 3473# See America/Port_of_Spain. 3474 3475 3476# Local Variables: 3477# coding: utf-8 3478# End: 3479