northamerica revision 158421
1# @(#)northamerica 8.6 2# <pre> 3 4# also includes Central America and the Caribbean 5 6# This data is by no means authoritative; if you think you know better, 7# go ahead and edit the file (and please send any changes to 8# tz@elsie.nci.nih.gov for general use in the future). 9 10# From Paul Eggert (1999-03-22): 11# A reliable and entertaining source about time zones is 12# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 13 14############################################################################### 15 16# United States 17 18# From Paul Eggert (1999-03-31): 19# Howse writes (pp 121-125) that time zones were invented by 20# Professor Charles Ferdinand Dowd (1825-1904), 21# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 22# His pamphlet ``A System of National Time for Railroads'' (1870) 23# was the result of his proposals at the Convention of Railroad Trunk Lines 24# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 25# but in 1872-05 he moved the proposed origin to Greenwich. 26# His proposal was adopted by the railroads on 1883-11-18 at 12:00, 27# and the most of the country soon followed suit. 28 29# From Paul Eggert (2005-04-16): 30# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 31# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 32 33# From Paul Eggert (2006-03-22): 34# A good source for time zone historical data in the US is 35# Thomas G. Shanks, The American Atlas (5th edition), 36# San Diego: ACS Publications, Inc. (1991). 37# Make sure you have the errata sheet; the book is somewhat useless without it. 38# It is the source for most of the pre-1991 US entries below. 39 40# From Paul Eggert (2001-03-06): 41# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 42# in his whimsical essay ``An Economical Project for Diminishing the Cost 43# of Light'' published in the Journal de Paris (1784-04-26). 44# Not everyone is happy with the results: 45# 46# I don't really care how time is reckoned so long as there is some 47# agreement about it, but I object to being told that I am saving 48# daylight when my reason tells me that I am doing nothing of the kind. 49# I even object to the implication that I am wasting something 50# valuable if I stay in bed after the sun has risen. As an admirer 51# of moonlight I resent the bossy insistence of those who want to 52# reduce my time for enjoying it. At the back of the Daylight Saving 53# scheme I detect the bony, blue-fingered hand of Puritanism, eager 54# to push people into bed earlier, and get them up earlier, to make 55# them healthy, wealthy and wise in spite of themselves. 56# 57# -- Robertson Davies, The diary of Samuel Marchbanks, 58# Clarke, Irwin (1947), XIX, Sunday 59# 60# For more about the first ten years of DST in the United States, see 61# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html"> 62# Ten years of daylight saving from the Pittsburgh standpoint 63# (Carnegie Library of Pittsburgh, 1927)</a>. 64# 65# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 66# However, DST was imposed by the Standard Time Act of 1918, which 67# was the first nationwide legal time standard, and apparently 68# time was just called "Standard Time" or "Daylight Saving Time". 69 70# From Arthur David Olson: 71# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 72# See, for example, the front page of the Saturday, 1974-10-26 73# and Sunday, 1974-10-27 editions of the Washington Post. 74 75# From Arthur David Olson: 76# Before the Uniform Time Act of 1966 took effect in 1967, observance of 77# Daylight Saving Time in the US was by local option, except during wartime. 78 79# From Arthur David Olson (2000-09-25): 80# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 81# In the introduction, Oboler spoke of "Eastern Peace Time." 82# An AltaVista search turned up 83# <a href="http://rowayton.org/rhs/hstaug45.html">: 84# "When the time is announced over the radio now, it is 'Eastern Peace 85# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 86# </a> (August 1945) by way of confirmation. 87 88# From Joseph Gallant citing 89# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 90# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 91# to switch to London for Attlee's address, but the American people 92# never got to hear his speech live. According to one press account, 93# CBS' Bob Trout was first to announce the word of Japan's surrender, 94# but a few seconds later, NBC, ABC and Mutual also flashed the word 95# of surrender, all of whom interrupting the bells of Big Ben in 96# London which were to precede Mr. Attlee's speech. 97 98# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 99# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 100# 101# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 102# Any announcement from Asia would reach St. John's New York newsroom on a 103# wire service teletype machine, which had prescribed signals for major news. 104# Associated Press, for example, would ring five bells before spewing out 105# typed copy of an important story, and 10 bells for news "of transcendental 106# importance." 107# 108# On Aug. 14, stalling while talking steadily into the NBC networks' open 109# microphone, St. John heard five bells and waited only to hear a sixth bell, 110# before announcing confidently: "Ladies and gentlemen, World War II is over. 111# The Japanese have agreed to our surrender terms." 112# 113# He had scored a 20-second scoop on other broadcasters. 114 115# From Arthur David Olson (2005-08-22): 116# Paul has been careful to use the "US" rules only in those locations 117# that are part of the United States; this reflects the real scope of 118# U.S. government action. So even though the "US" rules have changed 119# in the latest release, other countries won't be affected. 120 121# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 122Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 123Rule US 1918 1919 - Oct lastSun 2:00 0 S 124Rule US 1942 only - Feb 9 2:00 1:00 W # War 125Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 126Rule US 1945 only - Sep 30 2:00 0 S 127Rule US 1967 2006 - Oct lastSun 2:00 0 S 128Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 129Rule US 1974 only - Jan 6 2:00 1:00 D 130Rule US 1975 only - Feb 23 2:00 1:00 D 131Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 132Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 133Rule US 2007 max - Mar Sun>=8 2:00 1:00 D 134Rule US 2007 max - Nov Sun>=1 2:00 0 S 135 136# From Arthur David Olson, 2005-12-19 137# We generate the files specified below to guard against old files with 138# obsolete information being left in the time zone binary directory. 139# We limit the list to names that have appeared in previous versions of 140# this time zone package. 141# We do these as separate Zones rather than as Links to avoid problems if 142# a particular place changes whether it observes DST. 143# We put these specifications here in the northamerica file both to 144# increase the chances that they'll actually get compiled and to 145# avoid the need to duplicate the US rules in another file. 146 147# Zone NAME GMTOFF RULES FORMAT [UNTIL] 148Zone EST -5:00 - EST 149Zone MST -7:00 - MST 150Zone HST -10:00 - HST 151Zone EST5EDT -5:00 US E%sT 152Zone CST6CDT -6:00 US C%sT 153Zone MST7MDT -7:00 US M%sT 154Zone PST8PDT -8:00 US P%sT 155 156# From Bob Devine (1988-01-28): 157# ...Alaska (and Hawaii) had the timezone names changed in 1967. 158# old new 159# Pacific Standard Time(PST) -same- 160# Yukon Standard Time(YST) -same- 161# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 162# Nome Standard Time (NT) Bering Standard Time (BST) 163# 164# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 165# The YST zone now covers nearly all of the state, AHST just part 166# of the Aleutian islands. No DST. 167 168# From Paul Eggert (1995-12-19): 169# The tables below use `NST', not `NT', for Nome Standard Time. 170# I invented `CAWT' for Central Alaska War Time. 171 172# From U. S. Naval Observatory (1989-01-19): 173# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 174# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 175# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 176# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 177# USA MOUNTAIN 7 H BEHIND UTC DENVER 178# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 179# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 180# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 181# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 182# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 183# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 184# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 185# USA HAWAII 10 H BEHIND UTC 186# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 187 188# From Arthur David Olson (1989-01-21): 189# The above dates are for 1988. 190# Note the "AKST" and "AKDT" abbreviations, the claim that there's 191# no DST in Samoa, and the claim that there is DST in Alaska and the 192# Aleutians. 193 194# From Arthur David Olson (1988-02-13): 195# Legal standard time zone names, from United States Code (1982 Edition and 196# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 197# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 198# took effect), as explained in sections 263 and 261: 199# (none) 200# United States standard eastern time 201# United States standard mountain time 202# United States standard central time 203# United States standard Pacific time 204# (none) 205# United States standard Alaska time 206# (none) 207# Next, names from 1967-04-01 until 1983-11-30 (the date for 208# public law 98-181): 209# Atlantic standard time 210# eastern standard time 211# central standard time 212# mountain standard time 213# Pacific standard time 214# Yukon standard time 215# Alaska-Hawaii standard time 216# Bering standard time 217# And after 1983-11-30: 218# Atlantic standard time 219# eastern standard time 220# central standard time 221# mountain standard time 222# Pacific standard time 223# Alaska standard time 224# Hawaii-Aleutian standard time 225# Samoa standard time 226# The law doesn't give abbreviations. 227# 228# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 229# Public law 106-564 (2000-12-23) introduced the abbreviation 230# "Chamorro Standard Time" for time in Guam and the Northern Marianas. 231# See the file "australasia". 232 233# From Arthur David Olson, 2005-08-09 234# The following was signed into law on 2005-08-08. 235# 236# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 237# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15 238# U.S.C. 260a(a)) is amended-- 239# (1) by striking `first Sunday of April' and inserting `second 240# Sunday of March'; and 241# (2) by striking `last Sunday of October' and inserting `first 242# Sunday of November'. 243# (b) Effective Date- Subsection (a) shall take effect 1 year after the 244# date of enactment of this Act or March 1, 2007, whichever is later. 245# (c) Report to Congress- Not later than 9 months after the effective 246# date stated in subsection (b), the Secretary shall report to Congress 247# on the impact of this section on energy consumption in the United 248# States. 249# (d) Right to Revert- Congress retains the right to revert the 250# Daylight Saving Time back to the 2005 time schedules once the 251# Department study is complete. 252 253# US eastern time, represented by New York 254 255# Connecticut, Delaware, District of Columbia, most of Florida, 256# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky 257# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, 258# New Hampshire, New Jersey, New York, North Carolina, Ohio, 259# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 260# Vermont, Virginia, West Virginia 261 262# From Dave Cantor (2004-11-02): 263# Early this summer I had the occasion to visit the Mount Washington 264# Observatory weather station atop (of course!) Mount Washington [, NH].... 265# One of the staff members said that the station was on Eastern Standard Time 266# and didn't change their clocks for Daylight Saving ... so that their 267# reports will always have times which are 5 hours behind UTC. 268 269# From Paul Eggert (2005-08-26): 270# According to today's Huntsville Times 271# <http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1> 272# a few towns on Alabama's "eastern border with Georgia, such as Phenix City 273# in Russell County, Lanett in Chambers County and some towns in Lee County, 274# set their watches and clocks on Eastern time." It quotes H.H. "Bubba" 275# Roberts, city administrator in Phenix City. as saying "We are in the Central 276# time zone, but we do go by the Eastern time zone because so many people work 277# in Columbus." 278 279# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 280Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 281Rule NYC 1920 only - Oct lastSun 2:00 0 S 282Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 283Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 284Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 285# Zone NAME GMTOFF RULES FORMAT [UNTIL] 286Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 287 -5:00 US E%sT 1920 288 -5:00 NYC E%sT 1942 289 -5:00 US E%sT 1946 290 -5:00 NYC E%sT 1967 291 -5:00 US E%sT 292 293# US central time, represented by Chicago 294 295# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 296# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 297# Washington counties), Illinois, western Indiana 298# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 299# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 300# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 301# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 302# western Tennessee, most of Texas, Wisconsin 303 304# From Larry M. Smith (2006-04-26) re Wisconsin: 305# http://www.legis.state.wi.us/statutes/Stat0175.pdf ... 306# is currently enforced at the 01:00 time of change. Because the local 307# "bar time" in the state corresponds to 02:00, a number of citations 308# are issued for the "sale of class 'B' alcohol after prohibited 309# hours" within the deviated hour of this change every year.... 310 311# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 312Rule Chicago 1920 only - Jun 13 2:00 1:00 D 313Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 314Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 315Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 316Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 317Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 318# Zone NAME GMTOFF RULES FORMAT [UNTIL] 319Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 320 -6:00 US C%sT 1920 321 -6:00 Chicago C%sT 1936 Mar 1 2:00 322 -5:00 - EST 1936 Nov 15 2:00 323 -6:00 Chicago C%sT 1942 324 -6:00 US C%sT 1946 325 -6:00 Chicago C%sT 1967 326 -6:00 US C%sT 327# Oliver County, ND switched from mountain to central time on 1992-10-25. 328Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 329 -7:00 US M%sT 1992 Oct 25 02:00 330 -6:00 US C%sT 331# Morton County, ND, switched from mountain to central time on 332# 2003-10-26, except for the area around Mandan which was already central time. 333# See <http://dmses.dot.gov/docimages/p63/135818.pdf>. 334# Officially this switch also included part of Sioux County, and 335# Jones, Mellette, and Todd Counties in South Dakota; 336# but in practice these other counties were already observing central time. 337# See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>. 338Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21 339 -7:00 US M%sT 2003 Oct 26 02:00 340 -6:00 US C%sT 341 342# US mountain time, represented by Denver 343# 344# Colorado, far western Kansas, Montana, western 345# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 346# New Mexico, southwestern North Dakota, far eastern Oregon, 347# western South Dakota, far western Texas (El Paso County, Hudspeth County, 348# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 349# 350# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 351Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 352Rule Denver 1920 only - Oct lastSun 2:00 0 S 353Rule Denver 1921 only - May 22 2:00 0 S 354Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 355Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 356# Zone NAME GMTOFF RULES FORMAT [UNTIL] 357Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 358 -7:00 US M%sT 1920 359 -7:00 Denver M%sT 1942 360 -7:00 US M%sT 1946 361 -7:00 Denver M%sT 1967 362 -7:00 US M%sT 363 364# US Pacific time, represented by Los Angeles 365# 366# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 367# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties), 368# most of Nevada, most of Oregon, and Washington 369# 370# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 371Rule CA 1948 only - Mar 14 2:00 1:00 D 372Rule CA 1949 only - Jan 1 2:00 0 S 373Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 374Rule CA 1950 1961 - Sep lastSun 2:00 0 S 375Rule CA 1962 1966 - Oct lastSun 2:00 0 S 376# Zone NAME GMTOFF RULES FORMAT [UNTIL] 377Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 378 -8:00 US P%sT 1946 379 -8:00 CA P%sT 1967 380 -8:00 US P%sT 381 382# Alaska 383# AK%sT is the modern abbreviation for -9:00 per USNO. 384# 385# From Paul Eggert (2001-05-30): 386# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 387# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 388# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 389# also a Friday. Include only the time zone part of this transition, 390# ignoring the switch from Julian to Gregorian, since we can't represent 391# the Julian calendar. 392# 393# As far as we know, none of the exact locations mentioned below were 394# permanently inhabited in 1867 by anyone using either calendar. 395# (Yakutat was colonized by the Russians in 1799, but the settlement 396# was destroyed in 1805 by a Yakutat-kon war party.) However, there 397# were nearby inhabitants in some cases and for our purposes perhaps 398# it's best to simply use the official transition. 399# 400# Zone NAME GMTOFF RULES FORMAT [UNTIL] 401Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 402 -8:57:41 - LMT 1900 Aug 20 12:00 403 -8:00 - PST 1942 404 -8:00 US P%sT 1946 405 -8:00 - PST 1969 406 -8:00 US P%sT 1983 Oct 30 2:00 407 -9:00 US Y%sT 1983 Nov 30 408 -9:00 US AK%sT 409Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 410 -9:18:55 - LMT 1900 Aug 20 12:00 411 -9:00 - YST 1942 412 -9:00 US Y%sT 1946 413 -9:00 - YST 1969 414 -9:00 US Y%sT 1983 Nov 30 415 -9:00 US AK%sT 416Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 417 -9:59:36 - LMT 1900 Aug 20 12:00 418 -10:00 - CAT 1942 419 -10:00 US CAT/CAWT 1945 Aug 14 23:00u 420 -10:00 US CAT/CAPT 1946 # Peace 421 -10:00 - CAT 1967 Apr 422 -10:00 - AHST 1969 423 -10:00 US AH%sT 1983 Oct 30 2:00 424 -9:00 US Y%sT 1983 Nov 30 425 -9:00 US AK%sT 426Zone America/Nome 12:58:21 - LMT 1867 Oct 18 427 -11:01:38 - LMT 1900 Aug 20 12:00 428 -11:00 - NST 1942 429 -11:00 US N%sT 1946 430 -11:00 - NST 1967 Apr 431 -11:00 - BST 1969 432 -11:00 US B%sT 1983 Oct 30 2:00 433 -9:00 US Y%sT 1983 Nov 30 434 -9:00 US AK%sT 435Zone America/Adak 12:13:21 - LMT 1867 Oct 18 436 -11:46:38 - LMT 1900 Aug 20 12:00 437 -11:00 - NST 1942 438 -11:00 US N%sT 1946 439 -11:00 - NST 1967 Apr 440 -11:00 - BST 1969 441 -11:00 US B%sT 1983 Oct 30 2:00 442 -10:00 US AH%sT 1983 Nov 30 443 -10:00 US HA%sT 444# The following switches don't quite make our 1970 cutoff. 445# 446# Shanks writes that part of southwest Alaska (e.g. Aniak) 447# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 448# and another part (e.g. Akiak) made the same switch five weeks later. 449# 450# From David Flater (2004-11-09): 451# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 452# Historic Preservation Commission, provided this information, which 453# suggests that Unalaska deviated from statutory time from early 1967 454# possibly until 1983: 455# 456# Minutes of the Unalaska City Council Meeting, January 10, 1967: 457# "Except for St. Paul and Akutan, Unalaska is the only important 458# location not on Alaska Standard Time. The following resolution was 459# made by William Robinson and seconded by Henry Swanson: Be it 460# resolved that the City of Unalaska hereby goes to Alaska Standard 461# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 462# January 14, Alaska Standard Time.) This resolution was passed with 463# three votes for and one against." 464 465# Hawaii 466# 467# From Arthur David Olson: 468# And then there's Hawaii. 469# DST was observed for one day in 1933; 470# standard time was changed by half an hour in 1947; 471# it's always standard as of 1986. 472# 473# From Paul Eggert: 474# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 475# 476Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 477 -10:30 - HST 1933 Apr 30 2:00 478 -10:30 1:00 HDT 1933 May 21 2:00 479 -10:30 US H%sT 1947 Jun 8 2:00 480 -10:00 - HST 481 482# Now we turn to US areas that have diverged from the consensus since 1970. 483 484# Arizona mostly uses MST. 485 486# From Paul Eggert (2002-10-20): 487# 488# The information in the rest of this paragraph is derived from the 489# <a href="http://www.dlapr.lib.az.us/links/daylight.htm"> 490# Daylight Saving Time web page (2002-01-23)</a> maintained by the 491# Arizona State Library, Archives and Public Records. 492# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 493# time, but by federal law railroads, airlines, bus lines, military 494# personnel, and some engaged in interstate commerce continued to 495# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 496# Gazette says that was the date the law changed, and that 04-01 was 497# the date the state's clocks would change. In 1945 the State of 498# Arizona used standard time all year, again with exceptions only as 499# mandated by federal law. Arizona observed DST in 1967, but Arizona 500# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 501# 502# Shanks says the 1944 experiment came to an end on 1944-03-17. 503# Go with the Arizona State Library instead. 504 505Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 506 -7:00 US M%sT 1944 Jan 1 00:01 507 -7:00 - MST 1944 Apr 1 00:01 508 -7:00 US M%sT 1944 Oct 1 00:01 509 -7:00 - MST 1967 510 -7:00 US M%sT 1968 Mar 21 511 -7:00 - MST 512# From Arthur David Olson (1988-02-13): 513# A writer from the Inter Tribal Council of Arizona, Inc., 514# notes in private correspondence dated 1987-12-28 that "Presently, only the 515# Navajo Nation participates in the Daylight Saving Time policy, due to its 516# large size and location in three states." (The "only" means that other 517# tribal nations don't use DST.) 518 519Link America/Denver America/Shiprock 520 521# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 522# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 523# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 524# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 525# Teton, Twin Falls, Valley, Washington counties) and eastern Oregon 526# switched four weeks late in 1974. 527# 528# Zone NAME GMTOFF RULES FORMAT [UNTIL] 529Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 530 -8:00 US P%sT 1923 May 13 2:00 531 -7:00 US M%sT 1974 532 -7:00 - MST 1974 Feb 3 2:00 533 -7:00 US M%sT 534 535# Indiana 536# 537# For a map of Indiana's time zone regions, see: 538# <a href="http://www.mccsc.edu/time.html"> 539# What time is it in Indiana? 540# </a> (2006-03-01) 541# 542# From Paul Eggert (2006-03-22): 543# Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 544# with the following exceptions: 545# 546# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 547# Vandenburgh, and Warrick counties have been like America/Chicago. 548# 549# - Dearborn and Ohio counties have been like America/New_York. 550# 551# - Clark, Floyd, and Harrison counties have been like 552# America/Kentucky/Louisville. 553# 554# - Daviess, Dubois, Knox, Martin, Perry, and Pulaski counties 555# have been like America/Indiana/Vincennes. 556# 557# - Crawford, Pike, Starke, and Switzerland counties have their own time zone 558# histories as noted below. 559# 560# Shanks partitioned Indiana into 345 regions, each with its own time history, 561# and wrote ``Even newspaper reports present contradictory information.'' 562# Those Hoosiers! Such a flighty and changeable people! 563# Fortunately, most of the complexity occurred before our cutoff date of 1970. 564# 565# Other than Indianapolis, the Indiana place names are so nondescript 566# that they would be ambiguous if we left them at the `America' level. 567# So we reluctantly put them all in a subdirectory `America/Indiana'. 568 569# From Paul Eggert (2005-08-16): 570# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006. 571 572# From Nathan Stratton Treadway (2006-03-30): 573# http://www.dot.gov/affairs/dot0406.htm [3705 B] 574# From Deborah Goldsmith (2006-01-18): 575# http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB] 576# From Paul Eggert (2006-01-20): 577# It says "DOT is relocating the time zone boundary in Indiana to move Starke, 578# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the 579# Eastern Time Zone to the Central Time Zone.... The effective date of 580# this rule is 2:OO a.m. EST Sunday, April 2, 2006, which is the 581# changeover date from standard time to Daylight Saving Time." 582# Strictly speaking, this means the affected counties will change their 583# clocks twice that night, but this obviously is in error. The intent 584# is that 01:59:59 EST be followed by 02:00:00 CDT. 585 586# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 587Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 588Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 589Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 590# Zone NAME GMTOFF RULES FORMAT [UNTIL] 591Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 592 -6:00 US C%sT 1920 593 -6:00 Indianapolis C%sT 1942 594 -6:00 US C%sT 1946 595 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 596 -5:00 - EST 1957 Sep 29 2:00 597 -6:00 - CST 1958 Apr 27 2:00 598 -5:00 - EST 1969 599 -5:00 US E%sT 1971 600 -5:00 - EST 2006 601 -5:00 US E%sT 602# 603# Eastern Crawford County, Indiana, left its clocks alone in 1974, 604# as well as from 1976 through 2005. 605# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 606Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 607Rule Marengo 1951 only - Sep lastSun 2:00 0 S 608Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 609Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 610# Zone NAME GMTOFF RULES FORMAT [UNTIL] 611Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 612 -6:00 US C%sT 1951 613 -6:00 Marengo C%sT 1961 Apr 30 2:00 614 -5:00 - EST 1969 615 -5:00 US E%sT 1974 Jan 6 2:00 616 -6:00 1:00 CDT 1974 Oct 27 2:00 617 -5:00 US E%sT 1976 618 -5:00 - EST 2006 619 -5:00 US E%sT 620# 621# Daviess, Dubois, Knox, Martin, Perry, and Pulaski Counties, Indiana, 622# switched from eastern to central time in April 2006. 623# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 624Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D 625Rule Vincennes 1946 only - Sep lastSun 2:00 0 S 626Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D 627Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S 628Rule Vincennes 1955 only - May 1 0:00 1:00 D 629Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D 630Rule Vincennes 1960 only - Oct lastSun 2:00 0 S 631Rule Vincennes 1961 only - Sep lastSun 2:00 0 S 632Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S 633# Zone NAME GMTOFF RULES FORMAT [UNTIL] 634Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53 635 -6:00 US C%sT 1946 636 -6:00 Vincennes C%sT 1964 Apr 26 2:00 637 -5:00 - EST 1969 638 -5:00 US E%sT 1971 639 -5:00 - EST 2006 Apr 2 2:00 640 -6:00 US C%sT 641# 642# Pike County, Indiana moved from central to eastern time in 1977, 643# then switched back in 2006. 644# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 645Rule Pike 1955 only - May 1 0:00 1:00 D 646Rule Pike 1955 1960 - Sep lastSun 2:00 0 S 647Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D 648Rule Pike 1961 1964 - Oct lastSun 2:00 0 S 649# Zone NAME GMTOFF RULES FORMAT [UNTIL] 650Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53 651 -6:00 US C%sT 1955 652 -6:00 Pike C%sT 1965 Apr 25 2:00 653 -5:00 - EST 1966 Oct 30 2:00 654 -6:00 US C%sT 1977 Oct 30 2:00 655 -5:00 - EST 2006 Apr 2 2:00 656 -6:00 US C%sT 657# 658# Starke County, Indiana moved from central to eastern time in 1991, 659# then switched back in 2006. 660# From Arthur David Olson (1991-10-28): 661# An article on page A3 of the Sunday, 1991-10-27 Washington Post 662# notes that Starke County switched from Central time to Eastern time as of 663# 1991-10-27. 664# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 665Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 666Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 667Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 668Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 669Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 670# Zone NAME GMTOFF RULES FORMAT [UNTIL] 671Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 672 -6:00 US C%sT 1947 673 -6:00 Starke C%sT 1962 Apr 29 2:00 674 -5:00 - EST 1963 Oct 27 2:00 675 -6:00 US C%sT 1991 Oct 27 2:00 676 -5:00 - EST 2006 Apr 2 2:00 677 -6:00 US C%sT 678# 679# Switzerland County, Indiana, did not observe DST from 1973 through 2005. 680# Zone NAME GMTOFF RULES FORMAT [UNTIL] 681Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 682 -6:00 US C%sT 1954 Apr 25 2:00 683 -5:00 - EST 1969 684 -5:00 US E%sT 1973 685 -5:00 - EST 2006 686 -5:00 US E%sT 687 688# Part of Kentucky left its clocks alone in 1974. 689# This also includes Clark, Floyd, and Harrison counties in Indiana. 690# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 691Rule Louisville 1921 only - May 1 2:00 1:00 D 692Rule Louisville 1921 only - Sep 1 2:00 0 S 693Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 694Rule Louisville 1941 only - Sep lastSun 2:00 0 S 695Rule Louisville 1946 only - Jun 2 2:00 0 S 696Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 697Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 698# Zone NAME GMTOFF RULES FORMAT [UNTIL] 699Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 700 -6:00 US C%sT 1921 701 -6:00 Louisville C%sT 1942 702 -6:00 US C%sT 1946 703 -6:00 Louisville C%sT 1961 Jul 23 2:00 704 -5:00 - EST 1968 705 -5:00 US E%sT 1974 Jan 6 2:00 706 -6:00 1:00 CDT 1974 Oct 27 2:00 707 -5:00 US E%sT 708# 709# Wayne County, Kentucky 710# 711# From 712# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 713# Lake Cumberland LIFE 714# </a> (1999-01-29) via WKYM-101.7: 715# Clinton County has joined Wayne County in asking the DoT to change from 716# the Central to the Eastern time zone.... The Wayne County government made 717# the same request in December. And while Russell County officials have not 718# taken action, the majority of respondents to a poll conducted there in 719# August indicated they would like to change to "fast time" also. 720# The three Lake Cumberland counties are the farthest east of any U.S. 721# location in the Central time zone. 722# 723# From Rich Wales (2000-08-29): 724# After prolonged debate, and despite continuing deep differences of opinion, 725# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 726# (-0500) time. They won't "fall back" this year. See Sara Shipley, 727# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 728# 729# From Paul Eggert (2001-07-16): 730# The final rule was published in the 731# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> 732# Federal Register 65, 160 (2000-08-17), page 50154-50158. 733# </a> 734# 735Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 736 -6:00 US C%sT 1946 737 -6:00 - CST 1968 738 -6:00 US C%sT 2000 Oct 29 2:00 739 -5:00 US E%sT 740 741 742# From Rives McDow (2000-08-30): 743# Here ... are all the changes in the US since 1985. 744# Kearny County, KS (put all of county on central; 745# previously split between MST and CST) ... 1990-10 746# Starke County, IN (from CST to EST) ... 1991-10 747# Oliver County, ND (from MST to CST) ... 1992-10 748# West Wendover, NV (from PST TO MST) ... 1999-10 749# Wayne County, KY (from CST to EST) ... 2000-10 750# 751# From Paul Eggert (2001-07-17): 752# We don't know where the line used to be within Kearny County, KS, 753# so omit that change for now. 754# See America/Indiana/Knox for the Starke County, IN change. 755# See America/North_Dakota/Center for the Oliver County, ND change. 756# West Wendover, NV officially switched from Pacific to mountain time on 757# 1999-10-31. See the 758# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> 759# Federal Register 64, 203 (1999-10-21), page 56705-56707. 760# </a> 761# However, the Federal Register says that West Wendover already operated 762# on mountain time, and the rule merely made this official; 763# hence a separate tz entry is not needed. 764 765# Michigan 766# 767# From Bob Devine (1988-01-28): 768# Michigan didn't observe DST from 1968 to 1973. 769# 770# From Paul Eggert (1999-03-31): 771# Shanks writes that Michigan started using standard time on 1885-09-18, 772# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 773# that Detroit kept 774# 775# local time until 1900 when the City Council decreed that clocks should 776# be put back twenty-eight minutes to Central Standard Time. Half the 777# city obeyed, half refused. After considerable debate, the decision 778# was rescinded and the city reverted to Sun time. A derisive offer to 779# erect a sundial in front of the city hall was referred to the 780# Committee on Sewers. Then, in 1905, Central time was adopted 781# by city vote. 782# 783# This story is too entertaining to be false, so go with Howse over Shanks. 784# 785# From Paul Eggert (2001-03-06): 786# Garland (1927) writes ``Cleveland and Detroit advanced their clocks 787# one hour in 1914.'' This change is not in Shanks. We have no more 788# info, so omit this for now. 789# 790# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 791# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 792Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 793Rule Detroit 1948 only - Sep lastSun 2:00 0 S 794Rule Detroit 1967 only - Jun 14 2:00 1:00 D 795Rule Detroit 1967 only - Oct lastSun 2:00 0 S 796# Zone NAME GMTOFF RULES FORMAT [UNTIL] 797Zone America/Detroit -5:32:11 - LMT 1905 798 -6:00 - CST 1915 May 15 2:00 799 -5:00 - EST 1942 800 -5:00 US E%sT 1946 801 -5:00 Detroit E%sT 1973 802 -5:00 US E%sT 1975 803 -5:00 - EST 1975 Apr 27 2:00 804 -5:00 US E%sT 805# 806# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan, 807# switched from EST to CST/CDT in 1973. 808# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 809Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 810Rule Menominee 1946 only - Sep lastSun 2:00 0 S 811Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 812Rule Menominee 1966 only - Oct lastSun 2:00 0 S 813# Zone NAME GMTOFF RULES FORMAT [UNTIL] 814Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 815 -6:00 US C%sT 1946 816 -6:00 Menominee C%sT 1969 Apr 27 2:00 817 -5:00 - EST 1973 Apr 29 2:00 818 -6:00 US C%sT 819 820# Navassa 821# administered by the US Fish and Wildlife Service 822# claimed by US under the provisions of the 1856 Guano Islands Act 823# also claimed by Haiti 824# occupied 1857/1900 by the Navassa Phosphate Co 825# US lighthouse 1917/1996-09 826# currently uninhabited 827# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 828# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 829# Jimmy Skaggs, _The Great Guano Rush_ (1994). 830 831################################################################################ 832 833 834# From Paul Eggert (2006-03-22): 835# A good source for time zone historical data outside the U.S. is 836# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 837# San Diego: ACS Publications, Inc. (2003). 838# 839# Gwillim Law writes that a good source 840# for recent time zone data is the International Air Transport 841# Association's Standard Schedules Information Manual (IATA SSIM), 842# published semiannually. Law sent in several helpful summaries 843# of the IATA's data after 1990. 844# 845# Except where otherwise noted, Shanks & Pottenger is the source for 846# entries through 1990, and IATA SSIM is the source for entries afterwards. 847# 848# Other sources occasionally used include: 849# 850# Edward W. Whitman, World Time Differences, 851# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 852# which I found in the UCLA library. 853# 854# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf"> 855# William Willett, The Waste of Daylight, 19th edition 856# </a> (1914-03) 857# 858# See the `europe' file for Greenland. 859 860# Canada 861 862# From Alain LaBont<e'> (1994-11-14): 863# I post here the time zone abbreviations standardized in Canada 864# for both English and French in the CAN/CSA-Z234.4-89 standard.... 865# 866# UTC Standard time Daylight savings time 867# offset French English French English 868# -2:30 - - HAT NDT 869# -3 - - HAA ADT 870# -3:30 HNT NST - - 871# -4 HNA AST HAE EDT 872# -5 HNE EST HAC CDT 873# -6 HNC CST HAR MDT 874# -7 HNR MST HAP PDT 875# -8 HNP PST HAY YDT 876# -9 HNY YST - - 877# 878# HN: Heure Normale ST: Standard Time 879# HA: Heure Avanc<e'>e DT: Daylight saving Time 880# 881# A: de l'Atlantique Atlantic 882# C: du Centre Central 883# E: de l'Est Eastern 884# M: Mountain 885# N: Newfoundland 886# P: du Pacifique Pacific 887# R: des Rocheuses 888# T: de Terre-Neuve 889# Y: du Yukon Yukon 890# 891# From Paul Eggert (1994-11-22): 892# Alas, this sort of thing must be handled by localization software. 893 894# Unless otherwise specified, the data for Canada are all from Shanks 895# & Pottenger. 896 897# From Chris Walton (2006-04-01): 898# The British Columbia government announced yesterday that it will 899# adjust daylight savings next year to align with changes in the 900# U.S. and the rest of Canada.... 901# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm 902 903# From Paul Eggert (2006-04-25): 904# H. David Matthews and Mary Vincent's map 905# <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp"> 906# "It's about TIME", _Canadian Geographic_ (September-October 1998) 907# </a> contains detailed boundaries for regions observing nonstandard 908# time and daylight saving time arrangements in Canada circa 1998. 909# 910# INMS, the Institute for National Measurement Standards in Ottawa, has <a 911# href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php"> 912# information about standard and daylight saving time zones in Canada. 913# </a> (updated periodically). 914# Its unofficial information is often taken from Matthews and Vincent. 915# 916# CBC News reported that Ontario and Manitoba have announced plans to 917# follow the US change; see 918# <http://www.cbc.ca/news/background/daylightsavingtime/> (2005-10-21). 919# CBC news also reported that Prince Edward Island is the first 920# province in Atlantic Canada to follow the US change, and that Quebec 921# had agreed; see <http://www.cbc.ca/pei/story/pe_daylight_20051207.html> 922# (2005-12-07). It also reported that Alberta will fall into line; see 923# <http://www.cbc.ca/calgary/story/ca_daylight20060202.html> (2006-02-02). 924# For now, assume all of Canada will fall into line. 925 926# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 927Rule Canada 1918 only - Apr 14 2:00 1:00 D 928Rule Canada 1918 only - Oct 31 2:00 0 S 929Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 930Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 931Rule Canada 1945 only - Sep 30 2:00 0 S 932Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 933Rule Canada 1974 2006 - Oct lastSun 2:00 0 S 934Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D 935Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D 936Rule Canada 2007 max - Nov Sun>=1 2:00 0 S 937 938 939# Newfoundland (and far southeast Labrador) 940 941# From Paul Eggert (2000-10-02): 942# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 943# but the only part of Labrador that follows the rules is the 944# southeast corner, including Port Hope Simpson and Mary's Harbour, 945# but excluding, say, Black Tickle. 946 947# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 948Rule StJohns 1917 only - Apr 8 2:00 1:00 D 949Rule StJohns 1917 only - Sep 17 2:00 0 S 950# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger. 951Rule StJohns 1919 only - May 5 23:00 1:00 D 952Rule StJohns 1919 only - Aug 12 23:00 0 S 953# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger. 954Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 955Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 956# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks & 957# Pottenger. 958Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 959Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 960# Whitman gives the following transitions: 961# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 962# but go with Shanks & Pottenger and assume they used Canadian rules. 963# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 964# Apr 30 - Sep 24; go with Shanks & Pottenger. 965Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 966Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 967Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 968Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 969Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 970# From Paul Eggert (2000-10-02): 971# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 972# at 00:01 local time. For now, assume it started in 1987. 973Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 974Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S 975Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 976Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D 977# From Chris Walton (2006-04-05): 978# http://www.releases.gov.nl.ca/releases/2006/mpa/0331n01.htm 979# [This says Newfoundlandland expects to follow step with the US.] 980Rule StJohns 2007 max - Mar Sun>=8 0:01 1:00 D 981Rule StJohns 2007 max - Nov Sun>=1 0:01 0 S 982# 983# St John's has an apostrophe, but Posix file names can't have apostrophes. 984# Zone NAME GMTOFF RULES FORMAT [UNTIL] 985Zone America/St_Johns -3:30:52 - LMT 1884 986 -3:30:52 StJohns N%sT 1918 987 -3:30:52 Canada N%sT 1919 988 -3:30:52 StJohns N%sT 1935 Mar 30 989 -3:30 StJohns N%sT 1942 May 11 990 -3:30 Canada N%sT 1946 991 -3:30 StJohns N%sT 992 993# most of east Labrador 994 995# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 996# Zone NAME GMTOFF RULES FORMAT [UNTIL] 997Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 998 -3:30:52 - NST 1918 999 -3:30:52 Canada N%sT 1919 1000 -3:30:52 - NST 1935 Mar 30 1001 -3:30 - NST 1936 1002 -3:30 StJohns N%sT 1942 May 11 1003 -3:30 Canada N%sT 1946 1004 -3:30 StJohns N%sT 1966 Mar 15 2:00 1005 -4:00 StJohns A%sT 1006 1007 1008# west Labrador, Nova Scotia, Prince Edward I 1009 1010# From Paul Eggert (2006-03-22): 1011# Shanks & Pottenger write that since 1970 most of this region has been like 1012# Halifax. Many locales did not observe peacetime DST until 1972; 1013# Glace Bay, NS is the largest that we know of. 1014# Shanks & Pottenger also write that Liverpool, NS was the only town 1015# in Canada to observe DST in 1971 but not 1970; for now we'll assume 1016# this is a typo. 1017 1018# From Chris Walton (2006-04-25): 1019# Daylight saving time will be extended by four weeks starting in 2007.... 1020# Here is a news release which was issued today by the Nova Scotia government: 1021# http://www.gov.ns.ca/news/details.asp?id=20060425004 1022 1023# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1024Rule Halifax 1916 only - Apr 1 0:00 1:00 D 1025Rule Halifax 1916 only - Oct 1 0:00 0 S 1026Rule Halifax 1920 only - May 9 0:00 1:00 D 1027Rule Halifax 1920 only - Aug 29 0:00 0 S 1028Rule Halifax 1921 only - May 6 0:00 1:00 D 1029Rule Halifax 1921 1922 - Sep 5 0:00 0 S 1030Rule Halifax 1922 only - Apr 30 0:00 1:00 D 1031Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 1032Rule Halifax 1923 only - Sep 4 0:00 0 S 1033Rule Halifax 1924 only - Sep 15 0:00 0 S 1034Rule Halifax 1925 only - Sep 28 0:00 0 S 1035Rule Halifax 1926 only - May 16 0:00 1:00 D 1036Rule Halifax 1926 only - Sep 13 0:00 0 S 1037Rule Halifax 1927 only - May 1 0:00 1:00 D 1038Rule Halifax 1927 only - Sep 26 0:00 0 S 1039Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 1040Rule Halifax 1928 only - Sep 9 0:00 0 S 1041Rule Halifax 1929 only - Sep 3 0:00 0 S 1042Rule Halifax 1930 only - Sep 15 0:00 0 S 1043Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 1044Rule Halifax 1932 only - May 1 0:00 1:00 D 1045Rule Halifax 1933 only - Apr 30 0:00 1:00 D 1046Rule Halifax 1933 only - Oct 2 0:00 0 S 1047Rule Halifax 1934 only - May 20 0:00 1:00 D 1048Rule Halifax 1934 only - Sep 16 0:00 0 S 1049Rule Halifax 1935 only - Jun 2 0:00 1:00 D 1050Rule Halifax 1935 only - Sep 30 0:00 0 S 1051Rule Halifax 1936 only - Jun 1 0:00 1:00 D 1052Rule Halifax 1936 only - Sep 14 0:00 0 S 1053Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 1054Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 1055Rule Halifax 1939 only - May 28 0:00 1:00 D 1056Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 1057Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 1058Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 1059Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 1060Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 1061Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 1062Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 1063Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 1064Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 1065# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1066Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 1067 -4:00 Halifax A%sT 1918 1068 -4:00 Canada A%sT 1919 1069 -4:00 Halifax A%sT 1942 Feb 9 2:00s 1070 -4:00 Canada A%sT 1946 1071 -4:00 Halifax A%sT 1974 1072 -4:00 Canada A%sT 1073Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 1074 -4:00 Canada A%sT 1953 1075 -4:00 Halifax A%sT 1954 1076 -4:00 - AST 1972 1077 -4:00 Halifax A%sT 1974 1078 -4:00 Canada A%sT 1079 1080# New Brunswick 1081 1082# From Paul Eggert (2006-01-20): 1083# New Brunswick's Time Definition Act 1084# <http://www.gnb.ca/0062/PDF-acts/t-06.pdf> says they change at 00:01, and 1085# <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it 1086# clear that this has been the case since at least 1993. 1087# For now, assume it started in 1993. The Office of the Premier announced 1088# <http://www.gnb.ca/cnb/news/pre/2005e1737pr.htm> (2005-12-23) 1089# that they will bring forward proposed amendments to harmonize with the US; 1090# for now assume that this will happen, but they'll still switch at 00:01. 1091 1092# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1093Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D 1094Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S 1095Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D 1096Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S 1097Rule Moncton 1939 only - May 27 1:00 1:00 D 1098Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S 1099Rule Moncton 1940 only - May 19 1:00 1:00 D 1100Rule Moncton 1941 only - May 4 1:00 1:00 D 1101Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D 1102Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S 1103Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S 1104Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D 1105Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S 1106Rule Moncton 2007 max - Mar Sun>=8 0:01 1:00 D 1107Rule Moncton 2007 max - Nov Sun>=1 0:01 0 S 1108# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1109Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 1110 -5:00 - EST 1902 Jun 15 1111 -4:00 Canada A%sT 1933 1112 -4:00 Moncton A%sT 1942 1113 -4:00 Canada A%sT 1946 1114 -4:00 Moncton A%sT 1973 1115 -4:00 Canada A%sT 1993 1116 -4:00 Moncton A%sT 1117 1118# Ontario, Quebec 1119 1120# From Paul Eggert (2006-03-22): 1121# Shanks & Pottenger writes that since 1970 most of Ontario has been like 1122# Toronto, and most of Quebec has been like Montreal. 1123# Thunder Bay skipped DST in 1973. 1124# Many smaller locales did not observe peacetime DST until 1974; 1125# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1126# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 1127 1128# From Mark Brader (2003-07-26): 1129# [According to the Toronto Star] Orillia, Ontario, adopted DST 1130# effective Saturday, 1912-06-22, 22:00; the article mentions that 1131# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 1132# have already done so. In Orillia DST was to run until Saturday, 1133# 1912-08-31 (no time mentioned), but it was met with considerable 1134# hostility from certain segments of the public, and was revoked after 1135# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but 1136# presumably that should be -07-06. (1912-06-19, -07-12; also letters 1137# earlier in June). 1138# 1139# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 1140 1141# From Paul Eggert (1997-10-17): 1142# Mark Brader writes that an article in the 1997-10-14 Toronto Star 1143# says that Atikokan, Ontario currently does not observe DST, 1144# but will vote on 11-10 whether to use EST/EDT. 1145# He also writes that the 1146# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 1147# Ontario Time Act (1990, Chapter T.9) 1148# </a> 1149# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 1150# Officially Atikokan is therefore on CST/CDT, and most likely this report 1151# concerns a non-official time observed as a matter of local practice. 1152# 1153# From Paul Eggert (2006-03-22): 1154# For what it's worth, Shanks & Pottenger say that Atikokan has agreed with 1155# Rainy River ever since standard time was introduced. 1156 1157# From Paul Eggert (2000-10-02): 1158# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 1159# New Osnaburgh observe CST all year, that Big Trout Lake observes 1160# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 1161# violation of the official Ontario rules. 1162# They also write that Quebec east of the -63 meridian is supposed to 1163# observe AST, but residents as far east as Natashquan use EST/EDT, 1164# and residents east of Natashquan use AST. 1165# We probably need Zones for far east Quebec and for Atikokan, 1166# but we don't know when their practices started. 1167 1168# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1169Rule Mont 1917 only - Mar 25 2:00 1:00 D 1170Rule Mont 1917 only - Apr 24 0:00 0 S 1171Rule Mont 1919 only - Mar 31 2:30 1:00 D 1172Rule Mont 1919 only - Oct 25 2:30 0 S 1173Rule Mont 1920 only - May 2 2:30 1:00 D 1174Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S 1175Rule Mont 1921 only - May 1 2:00 1:00 D 1176Rule Mont 1922 only - Apr 30 2:00 1:00 D 1177Rule Mont 1924 only - May 17 2:00 1:00 D 1178Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 1179Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 1180# The 1927-to-1937 rules can be expressed more simply as 1181# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D 1182# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S 1183# The rules below avoid use of 24:00 1184# (which pre-1998 versions of zic cannot handle). 1185Rule Mont 1927 only - May 1 0:00 1:00 D 1186Rule Mont 1927 1932 - Sep lastSun 0:00 0 S 1187Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D 1188Rule Mont 1932 only - May 1 0:00 1:00 D 1189Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D 1190Rule Mont 1933 only - Oct 1 0:00 0 S 1191Rule Mont 1934 1939 - Sep lastSun 0:00 0 S 1192Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D 1193Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 1194Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 1195Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 1196Rule Mont 1957 1973 - Oct lastSun 2:00 0 S 1197 1198Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1199Rule Toronto 1919 only - Oct 26 0:00 0 S 1200Rule Toronto 1920 only - May 2 2:00 1:00 D 1201Rule Toronto 1920 only - Sep 26 0:00 0 S 1202Rule Toronto 1921 only - May 15 2:00 1:00 D 1203Rule Toronto 1921 only - Sep 15 2:00 0 S 1204Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1205# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16" 1206# was meant. 1207Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1208Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1209# The 1927-to-1939 rules can be expressed more simply as 1210# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1211# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1212# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1213# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1214# The rules below avoid use of Sun>=25 1215# (which pre-2004 versions of zic cannot handle). 1216Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1217Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1218Rule Toronto 1932 only - May 1 2:00 1:00 D 1219Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1220Rule Toronto 1933 only - Oct 1 2:00 0 S 1221Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1222Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1223Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1224Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1225Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1226Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1227Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1228Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1229Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1230# Shanks & Pottenger say Toronto ended DST a week early in 1971, 1231# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that he 1232# checked the 1971-10-30 issue of the Toronto Star, and it said that 1233# DST ended 1971-10-31 as usual. 1234Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1235 1236# From Paul Eggert (2003-07-27): 1237# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1238# Port Arthur, Ontario, the principle of the Bill has been in 1239# operation for the past three years, and in the City of Moose Jaw, 1240# Saskatchewan, for one year." 1241 1242# From David Bryan via Tory Tronrud, Director/Curator, 1243# Thunder Bay Museum (2003-11-12): 1244# There is some suggestion, however, that, by-law or not, daylight 1245# savings time was being practiced in Fort William and Port Arthur 1246# before 1909.... [I]n 1910, the line between the Eastern and Central 1247# Time Zones was permanently moved about two hundred miles west to 1248# include the Thunder Bay area.... When Canada adopted daylight 1249# savings time in 1916, Fort William and Port Arthur, having done so 1250# already, did not change their clocks.... During the Second World 1251# War,... [t]he cities agreed to implement DST during the summer 1252# months for the remainder of the war years. 1253 1254# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1255Zone America/Montreal -4:54:16 - LMT 1884 1256 -5:00 Mont E%sT 1918 1257 -5:00 Canada E%sT 1919 1258 -5:00 Mont E%sT 1942 Feb 9 2:00s 1259 -5:00 Canada E%sT 1946 1260 -5:00 Mont E%sT 1974 1261 -5:00 Canada E%sT 1262Zone America/Toronto -5:17:32 - LMT 1895 1263 -5:00 Canada E%sT 1919 1264 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1265 -5:00 Canada E%sT 1946 1266 -5:00 Toronto E%sT 1974 1267 -5:00 Canada E%sT 1268Zone America/Thunder_Bay -5:57:00 - LMT 1895 1269 -6:00 - CST 1910 1270 -5:00 - EST 1942 1271 -5:00 Canada E%sT 1970 1272 -5:00 Mont E%sT 1973 1273 -5:00 - EST 1974 1274 -5:00 Canada E%sT 1275Zone America/Nipigon -5:53:04 - LMT 1895 1276 -5:00 Canada E%sT 1940 Sep 29 1277 -5:00 1:00 EDT 1942 Feb 9 2:00s 1278 -5:00 Canada E%sT 1279Zone America/Rainy_River -6:17:56 - LMT 1895 1280 -6:00 Canada C%sT 1940 Sep 29 1281 -6:00 1:00 CDT 1942 Feb 9 2:00s 1282 -6:00 Canada C%sT 1283 1284 1285# Manitoba 1286 1287# From Chris Walton (2006-04-05): 1288# Here is a copy of the new official time act ... 1289# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php 1290# The act indicates that daylight savings ends at 2:00am. 1291 1292# From Rob Douglas (2006-04-06): 1293# the old Manitoba Time Act - as amended by Bill 2, assented to 1294# March 27, 1987 ... said ... 1295# "between two o'clock Central Standard Time in the morning of 1296# the first Sunday of April of each year and two o'clock Central 1297# Standard Time in the morning of the last Sunday of October next 1298# following, one hour in advance of Central Standard Time."... 1299# I believe that the English legislation [of the old time act] had = 1300# been assented to (March 22, 1967).... 1301# Also, as far as I can tell, there was no order-in-council varying 1302# the time of Daylight Saving Time for 2005 and so the provisions of 1303# the 1987 version would apply - the changeover was at 2:00 Central 1304# Standard Time (i.e. not until 3:00 Central Daylight Time). 1305 1306# From Paul Eggert (2006-04-10): 1307# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s) 1308# starting 1966. Since 02:00s is clearly correct for 1967 on, assume 1309# it was also 02:00s in 1966. 1310 1311# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1312Rule Winn 1916 only - Apr 23 0:00 1:00 D 1313Rule Winn 1916 only - Sep 17 0:00 0 S 1314Rule Winn 1918 only - Apr 14 2:00 1:00 D 1315Rule Winn 1918 only - Oct 31 2:00 0 S 1316Rule Winn 1937 only - May 16 2:00 1:00 D 1317Rule Winn 1937 only - Sep 26 2:00 0 S 1318Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1319Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1320Rule Winn 1945 only - Sep lastSun 2:00 0 S 1321Rule Winn 1946 only - May 12 2:00 1:00 D 1322Rule Winn 1946 only - Oct 13 2:00 0 S 1323Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1324Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1325Rule Winn 1950 only - May 1 2:00 1:00 D 1326Rule Winn 1950 only - Sep 30 2:00 0 S 1327Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1328Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1329Rule Winn 1959 only - Oct lastSun 2:00 0 S 1330Rule Winn 1960 only - Sep lastSun 2:00 0 S 1331Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1332Rule Winn 1963 only - Sep 22 2:00 0 S 1333Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D 1334Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S 1335Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D 1336# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1337Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1338 -6:00 Winn C%sT 2006 1339 -6:00 Canada C%sT 1340 1341 1342# Saskatchewan 1343 1344# From Mark Brader (2003-07-26): 1345# The first actual adoption of DST in Canada was at the municipal 1346# level. As the [Toronto] Star put it (1912-06-07), "While people 1347# elsewhere have long been talking of legislation to save daylight, 1348# the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1349# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1350# presumably late evening, as below), and would run until "the end of 1351# the summer". The discrepancy between municipal time and railroad 1352# time was noted. 1353 1354# From Paul Eggert (2003-07-27): 1355# Willett (1914-03) notes that DST "has been in operation ... in the 1356# City of Moose Jaw, Saskatchewan, for one year." 1357 1358# From Paul Eggert (2006-03-22): 1359# Shanks & Pottenger say that since 1970 this region has mostly been as Regina. 1360# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1361# Other western towns (e.g. Lloydminster) are like Edmonton. 1362# Matthews and Vincent (1998) write that Denare Beach and Creighton 1363# are like Winnipeg, in violation of Saskatchewan law. 1364 1365# From W. Jones (1992-11-06): 1366# The. . .below is based on information I got from our law library, the 1367# provincial archives, and the provincial Community Services department. 1368# A precise history would require digging through newspaper archives, and 1369# since you didn't say what you wanted, I didn't bother. 1370# 1371# Saskatchewan is split by a time zone meridian (105W) and over the years 1372# the boundary became pretty ragged as communities near it reevaluated 1373# their affiliations in one direction or the other. In 1965 a provincial 1374# referendum favoured legislating common time practices. 1375# 1376# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1377# Saskatchewan 1978) was proclaimed, and established that the eastern 1378# part of Saskatchewan would use CST year round, that districts in 1379# northwest Saskatchewan would by default follow CST but could opt to 1380# follow Mountain Time rules (thus 1 hour difference in the winter and 1381# zero in the summer), and that districts in southwest Saskatchewan would 1382# by default follow MT but could opt to follow CST. 1383# 1384# It took a few years for the dust to settle (I know one story of a town 1385# on one time zone having its school in another, such that a mom had to 1386# serve her family lunch in two shifts), but presently it seems that only 1387# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1388# rules any more; all other districts appear to have used CST year round 1389# since sometime in the 1960s. 1390 1391# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1392Rule Regina 1918 only - Apr 14 2:00 1:00 D 1393Rule Regina 1918 only - Oct 31 2:00 0 S 1394Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1395Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1396Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1397Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1398Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1399Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1400Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1401Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1402Rule Regina 1945 only - Sep lastSun 2:00 0 S 1403Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1404Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1405Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1406Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1407Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1408Rule Regina 1959 only - Oct lastSun 2:00 0 S 1409# 1410Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1411Rule Swift 1957 only - Oct lastSun 2:00 0 S 1412Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1413Rule Swift 1959 only - Oct lastSun 2:00 0 S 1414Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1415# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1416Zone America/Regina -6:58:36 - LMT 1905 Sep 1417 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1418 -6:00 - CST 1419Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1420 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1421 -7:00 Regina M%sT 1950 1422 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1423 -6:00 - CST 1424 1425 1426# Alberta 1427 1428# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1429Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1430Rule Edm 1918 only - Oct 31 2:00 0 S 1431Rule Edm 1919 only - May 27 2:00 0 S 1432Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1433Rule Edm 1920 only - Oct lastSun 2:00 0 S 1434Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1435Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1436Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1437Rule Edm 1945 only - Sep lastSun 2:00 0 S 1438Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1439Rule Edm 1947 only - Sep lastSun 2:00 0 S 1440Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1441Rule Edm 1967 only - Oct lastSun 2:00 0 S 1442Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1443Rule Edm 1969 only - Oct lastSun 2:00 0 S 1444Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1445Rule Edm 1972 2006 - Oct lastSun 2:00 0 S 1446# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1447Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1448 -7:00 Edm M%sT 1987 1449 -7:00 Canada M%sT 1450 1451 1452# British Columbia 1453 1454# From Paul Eggert (2006-03-22): 1455# Shanks & Pottenger write that since 1970 most of this region has 1456# been like Vancouver. 1457# Dawson Creek uses MST. Much of east BC is like Edmonton. 1458# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1459 1460# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1461Rule Vanc 1918 only - Apr 14 2:00 1:00 D 1462Rule Vanc 1918 only - Oct 31 2:00 0 S 1463Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 1464Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 1465Rule Vanc 1945 only - Sep 30 2:00 0 S 1466Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 1467Rule Vanc 1946 only - Oct 13 2:00 0 S 1468Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 1469Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S 1470# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1471Zone America/Vancouver -8:12:28 - LMT 1884 1472 -8:00 Vanc P%sT 1987 1473 -8:00 Canada P%sT 1474Zone America/Dawson_Creek -8:00:56 - LMT 1884 1475 -8:00 Canada P%sT 1947 1476 -8:00 Vanc P%sT 1972 Aug 30 2:00 1477 -7:00 - MST 1478 1479 1480# Northwest Territories, Nunavut, Yukon 1481 1482# From Paul Eggert (2006-03-22): 1483# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 1484# Mathew Englander (1996-10-07) gives the following refs: 1485# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 1486# c. 7 defines Yukon standard time as UTC-9. This is still valid; 1487# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 1488# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 1489# * O.I.C. 1980/02 established DST. 1490# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 1491# Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go 1492# with Englander. 1493 1494# From Rives McDow (1999-09-04): 1495# Nunavut ... moved ... to incorporate the whole territory into one time zone. 1496# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 1497# Nunavut moves to single time zone Oct. 31 1498# </a> 1499# 1500# From Antoine Leca (1999-09-06): 1501# We then need to create a new timezone for the Kitikmeot region of Nunavut 1502# to differentiate it from the Yellowknife region. 1503 1504# From Paul Eggert (1999-09-20): 1505# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 1506# Basic Facts: The New Territory 1507# </a> (1999) reports that Pangnirtung operates on eastern time, 1508# and that Coral Harbour does not observe DST. We don't know when 1509# Pangnirtung switched to eastern time; we'll guess 1995. 1510 1511# From Rives McDow (1999-11-08): 1512# On October 31, when the rest of Nunavut went to Central time, 1513# Pangnirtung wobbled. Here is the result of their wobble: 1514# 1515# The following businesses and organizations in Pangnirtung use Central Time: 1516# 1517# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 1518# Eastern Arctic National Parks, A & D Specialist 1519# 1520# The following businesses and organizations in Pangnirtung use Eastern Time: 1521# 1522# Hamlet office, All other businesses, Both schools, Airport operator 1523# 1524# This has made for an interesting situation there, which warranted the news. 1525# No one there that I spoke with seems concerned, or has plans to 1526# change the local methods of keeping time, as it evidently does not 1527# really interfere with any activities or make things difficult locally. 1528# They plan to celebrate New Year's turn-over twice, one hour apart, 1529# so it appears that the situation will last at least that long. 1530# The Nunavut Intergovernmental Affairs hopes that they will "come to 1531# their senses", but the locals evidently don't see any problem with 1532# the current state of affairs. 1533 1534# From Michaela Rodrigue, writing in the 1535# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 1536# Nunatsiaq News (1999-11-19)</a>: 1537# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 1538# central - or Nunavut time - for government offices, and eastern time 1539# for municipal offices and schools.... Igloolik [was similar but then] 1540# made the switch to central time on Saturday, Nov. 6. 1541 1542# From Paul Eggert (2000-10-02): 1543# Matthews and Vincent (1998) say the following, but we lack histories 1544# for these potential new Zones. 1545# 1546# The Canadian Forces station at Alert uses Eastern Time while the 1547# handful of residents at the Eureka weather station [in the Central 1548# zone] skip daylight savings. Baffin Island, which is crossed by the 1549# Central, Eastern and Atlantic Time zones only uses Eastern Time. 1550# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 1551# Central Time and Southampton Island [in the Central zone] is not 1552# required to use daylight savings. 1553 1554# From 1555# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> 1556# Nunavut now has two time zones 1557# </a> (2000-11-10): 1558# The Nunavut government would allow its employees in Kugluktuk and 1559# Cambridge Bay to operate on central time year-round, putting them 1560# one hour behind the rest of Nunavut for six months during the winter. 1561# At the end of October the two communities had rebelled against 1562# Nunavut's unified time zone, refusing to shift to eastern time with 1563# the rest of the territory for the winter. Cambridge Bay remained on 1564# central time, while Kugluktuk, even farther west, reverted to 1565# mountain time, which they had used before the advent of Nunavut's 1566# unified time zone in 1999. 1567# 1568# From Rives McDow (2001-01-20), quoting the Nunavut government: 1569# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 1570 1571# From Paul Eggert (2000-12-04): 1572# Let's just keep track of the official times for now. 1573 1574# From Rives McDow (2001-03-07): 1575# The premier of Nunavut has issued a ministerial statement advising 1576# that effective 2001-04-01, the territory of Nunavut will revert 1577# back to three time zones (mountain, central, and eastern). Of the 1578# cities in Nunavut, Coral Harbor is the only one that I know of that 1579# has said it will not observe dst, staying on EST year round. I'm 1580# checking for more info, and will get back to you if I come up with 1581# more. 1582# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 1583 1584# From Gwillim Law (2005-05-21): 1585# According to maps at 1586# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SWE.jpg 1587# http://inms-ienm.nrc-cnrc.gc.ca/images/time_services/TZ01SSE.jpg 1588# (both dated 2003), and 1589# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 1590# (from a 1998 Canadian Geographic article), the de facto and de jure time 1591# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 1592# round. Using Google, it's easy to find other websites that confirm this. 1593# I wasn't able to find how far back this time regimen goes, but since it 1594# predates the creation of Nunavut, it probably goes back many years.... 1595# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 1596# 1597# From Paul Eggert (2005-07-26): 1598# For lack of better information, assume that Southampton Island observed 1599# daylight saving only during wartime. 1600# 1601# From Chris Walton (2006-04-25): 1602# Daylight saving time will be extended by four weeks starting in 2007.... 1603# http://www.cbc.ca/north/story/nor-nwt-time-change.html 1604 1605# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1606Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 1607Rule NT_YK 1918 only - Oct 27 2:00 0 S 1608Rule NT_YK 1919 only - May 25 2:00 1:00 D 1609Rule NT_YK 1919 only - Nov 1 0:00 0 S 1610Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 1611Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 1612Rule NT_YK 1945 only - Sep 30 2:00 0 S 1613Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 1614Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 1615Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 1616Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S 1617Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D 1618# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1619Zone America/Pangnirtung -4:22:56 - LMT 1884 1620 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 1621 -5:00 Canada E%sT 1999 Oct 31 2:00 1622 -6:00 Canada C%sT 2000 Oct 29 2:00 1623 -5:00 Canada E%sT 1624Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 1625 -5:00 NT_YK E%sT 1999 Oct 31 2:00 1626 -6:00 Canada C%sT 2000 Oct 29 2:00 1627 -5:00 Canada E%sT 1628Zone America/Coral_Harbour -5:32:40 - LMT 1884 1629 -5:00 NT_YK E%sT 1946 1630 -5:00 - EST 1631Zone America/Rankin_Inlet -6:08:40 - LMT 1884 1632 -6:00 NT_YK C%sT 2000 Oct 29 2:00 1633 -5:00 - EST 2001 Apr 1 3:00 1634 -6:00 Canada C%sT 1635Zone America/Cambridge_Bay -7:00:20 - LMT 1884 1636 -7:00 NT_YK M%sT 1999 Oct 31 2:00 1637 -6:00 Canada C%sT 2000 Oct 29 2:00 1638 -5:00 - EST 2000 Nov 5 0:00 1639 -6:00 - CST 2001 Apr 1 3:00 1640 -7:00 Canada M%sT 1641Zone America/Yellowknife -7:37:24 - LMT 1884 1642 -7:00 NT_YK M%sT 1980 1643 -7:00 Canada M%sT 1644Zone America/Inuvik -8:54:00 - LMT 1884 1645 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 1646 -7:00 NT_YK M%sT 1980 1647 -7:00 Canada M%sT 1648Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 1649 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 1650 -8:00 NT_YK P%sT 1980 1651 -8:00 Canada P%sT 1652Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 1653 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 1654 -8:00 NT_YK P%sT 1980 1655 -8:00 Canada P%sT 1656 1657 1658############################################################################### 1659 1660# Mexico 1661 1662# From Paul Eggert (2001-03-05): 1663# The Investigation and Analysis Service of the 1664# Mexican Library of Congress (MLoC) has published a 1665# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> 1666# history of Mexican local time (in Spanish) 1667# </a>. 1668# 1669# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC. 1670# (In all cases we go with the MLoC.) 1671# S&P report that Baja was at -8:00 in 1922/1923. 1672# S&P say the 1930 transition in Baja was 1930-11-16. 1673# S&P report no DST during summer 1931. 1674# S&P report a transition at 1932-03-30 23:00, not 1932-04-01. 1675 1676# From Gwillim Law (2001-02-20): 1677# There are some other discrepancies between the Decrees page and the 1678# tz database. I think they can best be explained by supposing that 1679# the researchers who prepared the Decrees page failed to find some of 1680# the relevant documents. 1681 1682# From Alan Perry (1996-02-15): 1683# A guy from our Mexico subsidiary finally found the Presidential Decree 1684# outlining the timezone changes in Mexico. 1685# 1686# ------------- Begin Forwarded Message ------------- 1687# 1688# I finally got my hands on the Official Presidential Decree that sets up the 1689# rules for the DST changes. The rules are: 1690# 1691# 1. The country is divided in 3 timezones: 1692# - Baja California Norte (the Mexico/BajaNorte TZ) 1693# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 1694# - The rest of the country (the Mexico/General TZ) 1695# 1696# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 1697# at 2:00 AM, the times in each zone are as follows: 1698# BajaNorte: GMT+7 1699# BajaSur: GMT+6 1700# General: GMT+5 1701# 1702# 3. The rest of the year, the times are as follows: 1703# BajaNorte: GMT+8 1704# BajaSur: GMT+7 1705# General: GMT+6 1706# 1707# The Decree was published in Mexico's Official Newspaper on January 4th. 1708# 1709# -------------- End Forwarded Message -------------- 1710# From Paul Eggert (1996-06-12): 1711# For an English translation of the decree, see 1712# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 1713# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 1714# </a> 1715 1716# From Rives McDow (1998-10-08): 1717# The State of Quintana Roo has reverted back to central STD and DST times 1718# (i.e. UTC -0600 and -0500 as of 1998-08-02). 1719 1720# From Rives McDow (2000-01-10): 1721# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 1722# zone 5 hours from the International Date Line, and will not observe daylight 1723# savings time so as to stay on the same time zone as the southern part of 1724# Arizona year round. 1725 1726# From Jesper Norgaard, translating 1727# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 1728# In Oaxaca, the 55.000 teachers from the Section 22 of the National 1729# Syndicate of Education Workers, refuse to apply daylight saving each 1730# year, so that the more than 10,000 schools work at normal hour the 1731# whole year. 1732 1733# From Gwillim Law (2001-01-19): 1734# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 1735# (translated):... 1736# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 1737# that Summer Time will be reduced from seven to five months, starting 1738# this year.... 1739# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> 1740# [translated], says "summer time will ... take effect on the first Sunday 1741# in May, and end on the last Sunday of September. 1742 1743# From Arthur David Olson (2001-01-25): 1744# The 2001-01-24 traditional Washington Post contained the page one 1745# story "Timely Issue Divides Mexicans."... 1746# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 1747# ... Mexico City Mayor Lopez Obrador "...is threatening to keep 1748# Mexico City and its 20 million residents on a different time than 1749# the rest of the country..." In particular, Lopez Obrador would abolish 1750# observation of Daylight Saving Time. 1751 1752# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> 1753# Official statute published by the Energy Department 1754# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 1755# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). 1756 1757# From Paul Eggert (2001-03-03): 1758# 1759# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> 1760# James F. Smith writes in today's LA Times 1761# </a> 1762# * Sonora will continue to observe standard time. 1763# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that 1764# the Federal District will not adopt DST. 1765# * 4 of 16 district leaders announced they'll ignore the decree. 1766# * The decree does not affect federal-controlled facilities including 1767# the airport, banks, hospitals, and schools. 1768# 1769# For now we'll assume that the Federal District will bow to federal rules. 1770 1771# From Jesper Norgaard (2001-04-01): 1772# I found some references to the Mexican application of daylight 1773# saving, which modifies what I had already sent you, stating earlier 1774# that a number of northern Mexican states would go on daylight 1775# saving. The modification reverts this to only cover Baja California 1776# (Norte), while all other states (except Sonora, who has no daylight 1777# saving all year) will follow the original decree of president 1778# Vicente Fox, starting daylight saving May 6, 2001 and ending 1779# September 30, 2001. 1780# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> 1781# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 1782 1783# From Reuters (2001-09-04): 1784# Mexico's Supreme Court on Tuesday declared that daylight savings was 1785# unconstitutional in Mexico City, creating the possibility the 1786# capital will be in a different time zone from the rest of the nation 1787# next year.... The Supreme Court's ruling takes effect at 2:00 1788# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 1789# standard time. "This is so residents of the Federal District are not 1790# subject to unexpected time changes," a statement from the court said. 1791 1792# From Jesper Norgaard Welen (2002-03-12): 1793# ... consulting my local grocery store(!) and my coworkers, they all insisted 1794# that a new decision had been made to reinstate US style DST in Mexico.... 1795# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 1796# confirms this. Sonora as usual is the only state where DST is not applied. 1797 1798# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1799Rule Mexico 1939 only - Feb 5 0:00 1:00 D 1800Rule Mexico 1939 only - Jun 25 0:00 0 S 1801Rule Mexico 1940 only - Dec 9 0:00 1:00 D 1802Rule Mexico 1941 only - Apr 1 0:00 0 S 1803Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 1804Rule Mexico 1944 only - May 1 0:00 0 S 1805Rule Mexico 1950 only - Feb 12 0:00 1:00 D 1806Rule Mexico 1950 only - Jul 30 0:00 0 S 1807Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 1808Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 1809Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 1810Rule Mexico 2001 only - Sep lastSun 2:00 0 S 1811Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 1812Rule Mexico 2002 max - Oct lastSun 2:00 0 S 1813# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1814# Quintana Roo 1815Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 1816 -6:00 - CST 1981 Dec 23 1817 -5:00 Mexico E%sT 1998 Aug 2 2:00 1818 -6:00 Mexico C%sT 1819# Campeche, Yucatan 1820Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 1821 -6:00 - CST 1981 Dec 23 1822 -5:00 - EST 1982 Dec 2 1823 -6:00 Mexico C%sT 1824# Coahuila, Durango, Nuevo Leon, Tamaulipas 1825Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 1826 -6:00 - CST 1988 1827 -6:00 US C%sT 1989 1828 -6:00 Mexico C%sT 1829# Central Mexico 1830Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 1831 -7:00 - MST 1927 Jun 10 23:00 1832 -6:00 - CST 1930 Nov 15 1833 -7:00 - MST 1931 May 1 23:00 1834 -6:00 - CST 1931 Oct 1835 -7:00 - MST 1932 Apr 1 1836 -6:00 Mexico C%sT 2001 Sep 30 02:00 1837 -6:00 - CST 2002 Feb 20 1838 -6:00 Mexico C%sT 1839# Chihuahua 1840Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 1841 -7:00 - MST 1927 Jun 10 23:00 1842 -6:00 - CST 1930 Nov 15 1843 -7:00 - MST 1931 May 1 23:00 1844 -6:00 - CST 1931 Oct 1845 -7:00 - MST 1932 Apr 1 1846 -6:00 - CST 1996 1847 -6:00 Mexico C%sT 1998 1848 -6:00 - CST 1998 Apr Sun>=1 3:00 1849 -7:00 Mexico M%sT 1850# Sonora 1851Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 1852 -7:00 - MST 1927 Jun 10 23:00 1853 -6:00 - CST 1930 Nov 15 1854 -7:00 - MST 1931 May 1 23:00 1855 -6:00 - CST 1931 Oct 1856 -7:00 - MST 1932 Apr 1 1857 -6:00 - CST 1942 Apr 24 1858 -7:00 - MST 1949 Jan 14 1859 -8:00 - PST 1970 1860 -7:00 Mexico M%sT 1999 1861 -7:00 - MST 1862# Baja California Sur, Nayarit, Sinaloa 1863Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 1864 -7:00 - MST 1927 Jun 10 23:00 1865 -6:00 - CST 1930 Nov 15 1866 -7:00 - MST 1931 May 1 23:00 1867 -6:00 - CST 1931 Oct 1868 -7:00 - MST 1932 Apr 1 1869 -6:00 - CST 1942 Apr 24 1870 -7:00 - MST 1949 Jan 14 1871 -8:00 - PST 1970 1872 -7:00 Mexico M%sT 1873# Baja California 1874Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 1875 -7:00 - MST 1924 1876 -8:00 - PST 1927 Jun 10 23:00 1877 -7:00 - MST 1930 Nov 15 1878 -8:00 - PST 1931 Apr 1 1879 -8:00 1:00 PDT 1931 Sep 30 1880 -8:00 - PST 1942 Apr 24 1881 -8:00 1:00 PWT 1945 Aug 14 23:00u 1882 -8:00 1:00 PPT 1945 Nov 12 # Peace 1883 -8:00 - PST 1948 Apr 5 1884 -8:00 1:00 PDT 1949 Jan 14 1885 -8:00 - PST 1954 1886 -8:00 CA P%sT 1961 1887 -8:00 - PST 1976 1888 -8:00 US P%sT 1996 1889 -8:00 Mexico P%sT 2001 1890 -8:00 US P%sT 2002 Feb 20 1891 -8:00 Mexico P%sT 1892# From Paul Eggert (2006-03-22): 1893# Formerly there was an America/Ensenada zone, which differed from 1894# America/Tijuana only in that it did not observe DST from 1976 1895# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say 1896# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports 1897# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and 1898# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that 1899# DST-observance was a town-by-town matter back then. This concerns 1900# data after 1970 so most likely there should be at least one Zone 1901# other than America/Tijuana for Baja, but it's not clear yet what its 1902# name or contents should be. 1903# 1904# Revillagigedo Is 1905# no information 1906 1907############################################################################### 1908 1909# Anguilla 1910# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1911Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 1912 -4:00 - AST 1913 1914# Antigua and Barbuda 1915# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1916Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 1917 -5:00 - EST 1951 1918 -4:00 - AST 1919 1920# Bahamas 1921# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1922Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 1923Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 1924Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 1925# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1926Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 1927 -5:00 Bahamas E%sT 1928 1929# Barbados 1930# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1931Rule Barb 1977 only - Jun 12 2:00 1:00 D 1932Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1933Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1934Rule Barb 1979 only - Sep 30 2:00 0 S 1935Rule Barb 1980 only - Sep 25 2:00 0 S 1936# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1937Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1938 -3:58:28 - BMT 1932 # Bridgetown Mean Time 1939 -4:00 Barb A%sT 1940 1941# Belize 1942# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger. 1943# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1944Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1945Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1946Rule Belize 1973 only - Dec 5 0:00 1:00 D 1947Rule Belize 1974 only - Feb 9 0:00 0 S 1948Rule Belize 1982 only - Dec 18 0:00 1:00 D 1949Rule Belize 1983 only - Feb 12 0:00 0 S 1950# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1951Zone America/Belize -5:52:48 - LMT 1912 Apr 1952 -6:00 Belize C%sT 1953 1954# Bermuda 1955# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1956Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1957 -4:00 - AST 1974 Apr 28 2:00 1958 -4:00 Bahamas A%sT 1959 1960# Cayman Is 1961# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1962Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1963 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1964 -5:00 - EST 1965 1966# Costa Rica 1967# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1968Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1969Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1970Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 1971# IATA SSIM (1991-09) says the following was at 1:00; 1972# go with Shanks & Pottenger. 1973Rule CR 1991 only - Jul 1 0:00 0 S 1974Rule CR 1992 only - Mar 15 0:00 0 S 1975# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1976# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1977Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1978 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 1979 -6:00 CR C%sT 1980# Coco 1981# no information; probably like America/Costa_Rica 1982 1983# Cuba 1984 1985# From Arthur David Olson (1999-03-29): 1986# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 1987# the Cuban National Team and the Baltimore Orioles was carried live on 1988# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 1989# During the game, play-by-play announcer Jim Hunter noted that 1990# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 1991# Time today." (The "two hour" remark referred to losing one hour of 1992# sleep on 1999-03-28--when the announcers were in Cuba as it switched 1993# to DST--and one more hour on 1999-04-04--when the announcers will have 1994# returned to Baltimore, which switches on that date.) 1995 1996# From Evert van der Veer via Steffen Thorsen (2004-10-28): 1997# Cuba is not going back to standard time this year. 1998# From Paul Eggert (2006-03-22): 1999# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 2000# says that it's due to a problem at the Antonio Guiteras 2001# thermoelectric plant, and says "This October there will be no return 2002# to normal hours (after daylight saving time)". 2003# For now, let's assume that it's a temporary measure. 2004 2005# From Carlos A. Carnero Delgado (2005-11-12): 2006# This year (just like in 2004-2005) there's no change in time zone 2007# adjustment in Cuba. We will stay in daylight saving time: 2008# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html 2009 2010# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2011Rule Cuba 1928 only - Jun 10 0:00 1:00 D 2012Rule Cuba 1928 only - Oct 10 0:00 0 S 2013Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 2014Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 2015Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 2016Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 2017Rule Cuba 1965 only - Jun 1 0:00 1:00 D 2018Rule Cuba 1965 only - Sep 30 0:00 0 S 2019Rule Cuba 1966 only - May 29 0:00 1:00 D 2020Rule Cuba 1966 only - Oct 2 0:00 0 S 2021Rule Cuba 1967 only - Apr 8 0:00 1:00 D 2022Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 2023Rule Cuba 1968 only - Apr 14 0:00 1:00 D 2024Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 2025Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 2026Rule Cuba 1972 1974 - Oct 8 0:00 0 S 2027Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 2028Rule Cuba 1978 only - May 7 0:00 1:00 D 2029Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 2030Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 2031Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 2032Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 2033Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 2034Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 2035Rule Cuba 1996 only - Oct 6 0:00s 0 S 2036Rule Cuba 1997 only - Oct 12 0:00s 0 S 2037Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 2038Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 2039Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D 2040Rule Cuba 2006 max - Oct lastSun 0:00s 0 S 2041 2042# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2043Zone America/Havana -5:29:28 - LMT 1890 2044 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 2045 -5:00 Cuba C%sT 2046 2047# Dominica 2048# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2049Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 2050 -4:00 - AST 2051 2052# Dominican Republic 2053 2054# From Steffen Thorsen (2000-10-30): 2055# Enrique Morales reported to me that the Dominican Republic has changed the 2056# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 2057# http://www.listin.com.do/antes/261000/republica/princi.html 2058 2059# From Paul Eggert (2000-12-04): 2060# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 2061 2062# From Rives McDow (2000-12-01): 2063# Dominican Republic changed its mind and presidential decree on Tuesday, 2064# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 2065# Dominican Republic will be reverting to 8 hours from the International Date 2066# Line, and will not be using DST in the foreseeable future. The reason they 2067# decided to use DST was to be in synch with Puerto Rico, who was also going 2068# to implement DST. When Puerto Rico didn't implement DST, the president 2069# decided to revert. 2070 2071 2072# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2073Rule DR 1966 only - Oct 30 0:00 1:00 D 2074Rule DR 1967 only - Feb 28 0:00 0 S 2075Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 2076Rule DR 1970 only - Feb 21 0:00 0 S 2077Rule DR 1971 only - Jan 20 0:00 0 S 2078Rule DR 1972 1974 - Jan 21 0:00 0 S 2079# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2080Zone America/Santo_Domingo -4:39:36 - LMT 1890 2081 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 2082 -5:00 DR E%sT 1974 Oct 27 2083 -4:00 - AST 2000 Oct 29 02:00 2084 -5:00 US E%sT 2000 Dec 3 01:00 2085 -4:00 - AST 2086 2087# El Salvador 2088 2089# From Paul Eggert (2006-05-05): 2090# worldtimezone.com reports a 2006-05-02 Spanish-language AP article 2091# saying Honduras will start using DST midnight Saturday, effective 4 2092# months until September, and a 2006-05-03 NACION article saying El 2093# Salvador will follow suit. However, ignore this for now, because: 2094# From Jesper Norgaard Welen (2005-05-05): 2095# Change of DST perhaps postponed in El Salvador: 2096# http://www.laprensagrafica.com/lodeldia/883.asp 2097 2098# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2099Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 2100Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 2101# There are too many San Salvadors elsewhere, so use America/El_Salvador 2102# instead of America/San_Salvador. 2103# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2104Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 2105 -6:00 Salv C%sT 2106 2107# Grenada 2108# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2109Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 2110 -4:00 - AST 2111 2112# Guadeloupe 2113# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2114Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 2115 -4:00 - AST 2116 2117# Guatemala 2118# 2119# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen: 2120# Diario Co Latino, at 2121# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079, 2122# says in an article dated 2006-04-19 that the Guatemalan government had 2123# decided on that date to advance official time by 60 minutes, to lessen the 2124# impact of the elevated cost of oil.... Daylight saving time will last from 2125# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified). 2126# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2127Rule Guat 1973 only - Nov 25 0:00 1:00 D 2128Rule Guat 1974 only - Feb 24 0:00 0 S 2129Rule Guat 1983 only - May 21 0:00 1:00 D 2130Rule Guat 1983 only - Sep 22 0:00 0 S 2131Rule Guat 1991 only - Mar 23 0:00 1:00 D 2132Rule Guat 1991 only - Sep 7 0:00 0 S 2133Rule Guat 2006 only - Apr 30 0:00 1:00 D 2134Rule Guat 2006 only - Oct 1 0:00 0 S 2135# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2136Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 2137 -6:00 Guat C%sT 2138 2139# Haiti 2140# From Gwillim Law (2005-04-15): 2141# Risto O. Nykanen wrote me that Haiti is now on DST. 2142# I searched for confirmation, and I found a 2143# <a href="http://www.haitianconsulate.org/time.doc"> press release 2144# on the Web page of the Haitian Consulate in Chicago (2005-03-31), 2145# </a>. Translated from French, it says: 2146# 2147# "The Prime Minister's Communication Office notifies the public in general 2148# and the press in particular that, following a decision of the Interior 2149# Ministry and the Territorial Collectivities [I suppose that means the 2150# provinces], Haiti will move to Eastern Daylight Time in the night from next 2151# Saturday the 2nd to Sunday the 3rd. 2152# 2153# "Consequently, the Prime Minister's Communication Office wishes to inform 2154# the population that the country's clocks will be set forward one hour 2155# starting at midnight. This provision will hold until the last Saturday in 2156# October 2005. 2157# 2158# "Port-au-Prince, March 31, 2005" 2159# 2160# From Steffen Thorsen (2006-04-04): 2161# I have been informed by users that Haiti observes DST this year like 2162# last year, so the current "only" rule for 2005 might be changed to a 2163# "max" rule or to last until 2006. (Who knows if they will observe DST 2164# next year or if they will extend their DST like US/Canada next year). 2165# 2166# I have found this article about it (in French): 2167# http://www.haitipressnetwork.com/news.cfm?articleID=7612 2168# 2169# The reason seems to be an energy crisis. 2170 2171 2172# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2173Rule Haiti 1983 only - May 8 0:00 1:00 D 2174Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 2175Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 2176# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. 2177# Go with IATA. 2178Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 2179Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 2180Rule Haiti 2005 max - Apr Sun>=1 0:00 1:00 D 2181Rule Haiti 2005 max - Oct lastSun 0:00 0 S 2182# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2183Zone America/Port-au-Prince -4:49:20 - LMT 1890 2184 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 2185 -5:00 Haiti E%sT 2186 2187# Honduras 2188# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1. 2189 2190# From Paul Eggert (2006-05-05): 2191# worldtimezone.com reports a 2006-05-02 Spanish-language AP article 2192# saying Honduras will start using DST midnight Saturday, effective 4 2193# months until September. La Tribuna reported today 2194# <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president 2195# of Honduras, refused to back down on this. For lack of better info, 2196# assume they'll use the same end-of-DST rules as in 1987 and 1988. 2197 2198# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2199Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D 2200Rule Hond 1987 1988 - Sep lastSun 0:00 0 S 2201Rule Hond 2006 only - May Sun>=1 0:00 1:00 D 2202Rule Hond 2006 only - Sep lastSun 0:00 0 S 2203# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2204Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 2205 -6:00 Hond C%sT 2206# 2207# Great Swan I ceded by US to Honduras in 1972 2208 2209# Jamaica 2210 2211# From Bob Devine (1988-01-28): 2212# Follows US rules. 2213 2214# From U. S. Naval Observatory (1989-01-19): 2215# JAMAICA 5 H BEHIND UTC 2216 2217# From Shanks & Pottenger: 2218# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2219Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 2220 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 2221 -5:00 - EST 1974 Apr 28 2:00 2222 -5:00 US E%sT 1984 2223 -5:00 - EST 2224 2225# Martinique 2226# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2227Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 2228 -4:04:20 - FFMT 1911 May # Fort-de-France MT 2229 -4:00 - AST 1980 Apr 6 2230 -4:00 1:00 ADT 1980 Sep 28 2231 -4:00 - AST 2232 2233# Montserrat 2234# From Paul Eggert (2006-03-22): 2235# In 1995 volcanic eruptions forced evacuation of Plymouth, the capital. 2236# world.gazetteer.com says Cork Hill is the most populous location now. 2237# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2238Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Cork Hill 2239 -4:00 - AST 2240 2241# Nicaragua 2242# 2243# This uses Shanks & Pottenger for times before 2005. 2244# 2245# From Steffen Thorsen (2005-04-12): 2246# I've got reports from 8 different people that Nicaragua just started 2247# DST on Sunday 2005-04-10, in order to save energy because of 2248# expensive petroleum. The exact end date for DST is not yet 2249# announced, only "September" but some sites also say "mid-September". 2250# Some background information is available on the President's official site: 2251# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 2252# The Decree, no 23-2005 is available here: 2253# 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 2254# 2255# From Paul Eggert (2005-05-01): 2256# The decree doesn't say anything about daylight saving, but for now let's 2257# assume that it is daylight saving.... 2258# 2259# From Gwillim Law (2005-04-21): 2260# The Associated Press story on the time change, which can be found at 2261# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 2262# and elsewhere, says (fifth paragraph, translated from Spanish): "The last 2263# time that a change of clocks was applied to save energy was in the year 2000 2264# during the Arnoldo Aleman administration."... 2265# The northamerica file says that Nicaragua has been on UTC-6 continuously 2266# since December 1998. I wasn't able to find any details of Nicaraguan time 2267# changes in 2000. Perhaps a note could be added to the northamerica file, to 2268# the effect that we have indirect evidence that DST was observed in 2000. 2269# 2270# From Jesper Norgaard Welen (2005-11-02): 2271# Nicaragua left DST the 2005-10-02 at 00:00 (local time). 2272# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm 2273# (2005-09-26) 2274# 2275# From Jesper Norgaard Welen (2006-05-05): 2276# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410 2277# (my informal translation) 2278# By order of the president of the republic, Enrique Bolanos, Nicaragua 2279# advanced by sixty minutes their official time, yesterday at 2 in the 2280# morning, and will stay that way until 30.th. of september. 2281# 2282# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2283Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 2284Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 2285Rule Nic 2005 only - Apr 10 0:00 1:00 D 2286Rule Nic 2005 2006 - Oct Sun>=1 0:00 0 S 2287Rule Nic 2006 only - Apr 30 2:00 1:00 D 2288# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2289Zone America/Managua -5:45:08 - LMT 1890 2290 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 2291 -6:00 - CST 1973 May 2292 -5:00 - EST 1975 Feb 16 2293 -6:00 Nic C%sT 1992 Jan 1 4:00 2294 -5:00 - EST 1992 Sep 24 2295 -6:00 - CST 1993 2296 -5:00 - EST 1997 2297 -6:00 Nic C%sT 2298 2299# Panama 2300# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2301Zone America/Panama -5:18:08 - LMT 1890 2302 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time 2303 -5:00 - EST 2304 2305# Puerto Rico 2306# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 2307# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2308Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 2309 -4:00 - AST 1942 May 3 2310 -4:00 US A%sT 1946 2311 -4:00 - AST 2312 2313# St Kitts-Nevis 2314# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2315Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 2316 -4:00 - AST 2317 2318# St Lucia 2319# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2320Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 2321 -4:04:00 - CMT 1912 # Castries Mean Time 2322 -4:00 - AST 2323 2324# St Pierre and Miquelon 2325# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 2326# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2327Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 2328 -4:00 - AST 1980 May 2329 -3:00 - PMST 1987 # Pierre & Miquelon Time 2330 -3:00 Canada PM%sT 2331 2332# St Vincent and the Grenadines 2333# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2334Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 2335 -4:04:56 - KMT 1912 # Kingstown Mean Time 2336 -4:00 - AST 2337 2338# Turks and Caicos 2339# From Paul Eggert (2006-03-22): 2340# Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998) 2341# says they switch at midnight. Go with IATA SSIM. 2342# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2343Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D 2344Rule TC 1979 max - Oct lastSun 0:00 0 S 2345Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D 2346# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2347Zone America/Grand_Turk -4:44:32 - LMT 1890 2348 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 2349 -5:00 TC E%sT 2350 2351# British Virgin Is 2352# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2353Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 2354 -4:00 - AST 2355 2356# Virgin Is 2357# Zone NAME GMTOFF RULES FORMAT [UNTIL] 2358Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 2359 -4:00 - AST 2360