1# $OpenBSD: northamerica,v 1.14 2002/04/04 18:51:20 millert Exp $ 2# @(#)northamerica 7.61 3# also includes Central America and the Caribbean 4 5# This data is by no means authoritative; if you think you know better, 6# go ahead and edit the file (and please send any changes to 7# tz@elsie.nci.nih.gov for general use in the future). 8 9# From Paul Eggert <eggert@twinsun.com> (1999-03-22): 10# A reliable and entertaining source about time zones is 11# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 12 13############################################################################### 14 15# United States 16 17# From Paul Eggert (1999-03-31): 18# Howse writes (pp 121-125) that time zones were invented by 19# Professor Charles Ferdinand Dowd (1825-1904), 20# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 21# His pamphlet ``A System of National Time for Railroads'' (1870) 22# was the result of his proposals at the Convention of Railroad Trunk Lines 23# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 24# but in 1872-05 he moved the proposed origin to Greenwich. 25# His proposal was adopted by the railroads on 1883-11-18 at 12:00, 26# and the most of the country soon followed suit. 27 28# From Paul Eggert <eggert@twinsun.com> (1995-12-19): 29# A good source for time zone historical data in the US is 30# Thomas G. Shanks, The American Atlas (5th edition), 31# San Diego: ACS Publications, Inc. (1991). 32# Make sure you have the errata sheet; the book is somewhat useless without it. 33# It is the source for the US and Puerto Rico entries below. 34 35# From Paul Eggert (2001-03-06): 36# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 37# in his whimsical essay ``An Economical Project for Diminishing the Cost 38# of Light'' published in the Journal de Paris (1784-04-26). 39# Not everyone is happy with the results: 40# 41# I don't really care how time is reckoned so long as there is some 42# agreement about it, but I object to being told that I am saving 43# daylight when my reason tells me that I am doing nothing of the kind. 44# I even object to the implication that I am wasting something 45# valuable if I stay in bed after the sun has risen. As an admirer 46# of moonlight I resent the bossy insistence of those who want to 47# reduce my time for enjoying it. At the back of the Daylight Saving 48# scheme I detect the bony, blue-fingered hand of Puritanism, eager 49# to push people into bed earlier, and get them up earlier, to make 50# them healthy, wealthy and wise in spite of themselves. 51# 52# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday 53# 54# For more about the first ten years of DST in the United States, see 55# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html"> 56# Ten years of daylight saving from the Pittsburgh standpoint 57# (Carnegie Library of Pittsburgh, 1927)</a>. 58# 59# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 60# However, DST was imposed by the Standard Time Act of 1918, which 61# was the first nationwide legal time standard, and apparently 62# time was just called "Standard Time" or "Daylight Saving Time". 63 64# From Arthur David Olson: 65# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 66# See, for example, the front page of the Saturday, 1974-10-26 67# and Sunday, 1974-10-27 editions of the Washington Post. 68 69# From Arthur David Olson: 70# Before the Uniform Time Act of 1966 took effect in 1967, observance of 71# Daylight Saving Time in the US was by local option, except during wartime. 72 73# From Arthur David Olson (2000-09-25): 74# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 75# In the introduction, Oboler spoke of "Eastern Peace Time." 76# An AltaVista search turned up 77# <a href="http://rowayton.org/rhs/hstaug45.html">: 78# "When the time is announced over the radio now, it is 'Eastern Peace 79# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 80# </a> (August 1945) by way of confirmation. 81 82# From Joseph Gallant <notquite@hotmail.com>, citing 83# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 84# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 85# to switch to London for Attlee's address, but the American people 86# never got to hear his speech live. According to one press account, 87# CBS' Bob Trout was first to announce the word of Japan's surrender, 88# but a few seconds later, NBC, ABC and Mutual also flashed the word 89# of surrender, all of whom interrupting the bells of Big Ben in 90# London which were to precede Mr. Attlee's speech. 91 92# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 93Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 94Rule US 1918 1919 - Oct lastSun 2:00 0 S 95Rule US 1942 only - Feb 9 2:00 1:00 W # War 96Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 97Rule US 1945 only - Sep 30 2:00 0 S 98Rule US 1967 max - Oct lastSun 2:00 0 S 99Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 100Rule US 1974 only - Jan 6 2:00 1:00 D 101Rule US 1975 only - Feb 23 2:00 1:00 D 102Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 103Rule US 1987 max - Apr Sun>=1 2:00 1:00 D 104# <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:"> 105# H.R.177 106# </a> (introduced 1999-01-06) would change April to March in the above rule. 107 108# From Bob Devine (1988-01-28): 109# ...Alaska (and Hawaii) had the timezone names changed in 1967. 110# old new 111# Pacific Standard Time(PST) -same- 112# Yukon Standard Time(YST) -same- 113# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 114# Nome Standard Time (NT) Bering Standard Time (BST) 115# 116# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 117# The YST zone now covers nearly all of the state, AHST just part 118# of the Aleutian islands. No DST. 119 120# From Paul Eggert (1995-12-19): 121# The tables below use `NST', not `NT', for Nome Standard Time. 122# I invented `CAWT' for Central Alaska War Time. 123 124# From U. S. Naval Observatory (1989-01-19): 125# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 126# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 127# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 128# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 129# USA MOUNTAIN 7 H BEHIND UTC DENVER 130# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 131# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 132# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 133# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 134# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 135# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 136# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 137# USA HAWAII 10 H BEHIND UTC 138# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 139 140# From Arthur David Olson (1989-01-21): 141# The above dates are for 1988. 142# Note the "AKST" and "AKDT" abbreviations, the claim that there's 143# no DST in Samoa, and the claim that there is DST in Alaska and the 144# Aleutians. 145 146# From Arthur David Olson (1988-02-13): 147# Legal standard time zone names, from United States Code (1982 Edition and 148# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 149# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 150# took effect), as explained in sections 263 and 261: 151# (none) 152# United States standard eastern time 153# United States standard mountain time 154# United States standard central time 155# United States standard Pacific time 156# (none) 157# United States standard Alaska time 158# (none) 159# Next, names from 1967-04-01 until 1983-11-30 (the date for 160# public law 98-181): 161# Atlantic standard time 162# eastern standard time 163# central standard time 164# mountain standard time 165# Pacific standard time 166# Yukon standard time 167# Alaska-Hawaii standard time 168# Bering standard time 169# And after 1983-11-30: 170# Atlantic standard time 171# eastern standard time 172# central standard time 173# mountain standard time 174# Pacific standard time 175# Alaska standard time 176# Hawaii-Aleutian standard time 177# Samoa standard time 178# The law doesn't give abbreviations. 179# 180# From Paul Eggert (1995-12-19): 181# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions. 182# Go with Shanks. 183# 184# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 185# Public law 106-564 (2000-12-23) introduced the abbreviation 186# "Chamorro Standard Time" for time in Guam and the Northern Marianas. 187# See the file "australasia". 188 189 190# US eastern time, represented by New York 191 192# Connecticut, Delaware, District of Columbia, most of Florida, 193# Georgia, far southeastern Indiana, eastern Kentucky, Maine, 194# Maryland, Massachusetts, New Hampshire, New Jersey, New York, North 195# Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, eastern 196# Tennessee, Vermont, Virginia, West Virginia 197 198# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 199Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 200Rule NYC 1920 only - Oct lastSun 2:00 0 S 201Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 202Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 203Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 204# Zone NAME GMTOFF RULES FORMAT [UNTIL] 205Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 206 -5:00 US E%sT 1920 207 -5:00 NYC E%sT 1942 208 -5:00 US E%sT 1946 209 -5:00 NYC E%sT 1967 210 -5:00 US E%sT 211 212# US central time, represented by Chicago 213 214# Alabama, Arkansas, Florida panhandle, Illinois, western Indiana 215# corners, Iowa, most of Kansas, western Kentucky, Louisiana, 216# Minnesota, Mississippi, Missouri, eastern Nebraska, eastern North 217# Dakota, Oklahoma, eastern South Dakota, western Tennessee, most of 218# Texas, Wisconsin 219 220# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 221Rule Chicago 1920 only - Jun 13 2:00 1:00 D 222Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 223Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 224Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 225Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 226Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 227# Zone NAME GMTOFF RULES FORMAT [UNTIL] 228Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 229 -6:00 US C%sT 1920 230 -6:00 Chicago C%sT 1936 Mar 1 2:00 231 -5:00 - EST 1936 Nov 15 2:00 232 -6:00 Chicago C%sT 1942 233 -6:00 US C%sT 1946 234 -6:00 Chicago C%sT 1967 235 -6:00 US C%sT 236# Oliver County, ND switched from mountain to central time on 1992-10-25. 237Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:00 238 -7:00 US M%sT 1992 Oct 25 02:00 239 -6:00 US C%sT 240 241# US mountain time, represented by Denver 242# 243# Colorado, southern Idaho, far western Kansas, Montana, western 244# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 245# New Mexico, southwestern North Dakota, far eastern Oregon, 246# western South Dakota, far western Texas (El Paso County, Hudspeth County, 247# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 248# 249# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 250Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 251Rule Denver 1920 only - Oct lastSun 2:00 0 S 252Rule Denver 1921 only - May 22 2:00 0 S 253Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 254Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 255# Zone NAME GMTOFF RULES FORMAT [UNTIL] 256Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 257 -7:00 US M%sT 1920 258 -7:00 Denver M%sT 1942 259 -7:00 US M%sT 1946 260 -7:00 Denver M%sT 1967 261 -7:00 US M%sT 262 263# US Pacific time, represented by Los Angeles 264# 265# California, northern Idaho, most of Nevada, most of Oregon, and Washington 266# 267# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 268Rule CA 1948 only - Mar 14 2:00 1:00 D 269Rule CA 1949 only - Jan 1 2:00 0 S 270Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 271Rule CA 1950 1961 - Sep lastSun 2:00 0 S 272Rule CA 1962 1966 - Oct lastSun 2:00 0 S 273# Zone NAME GMTOFF RULES FORMAT [UNTIL] 274Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 275 -8:00 US P%sT 1946 276 -8:00 CA P%sT 1967 277 -8:00 US P%sT 278 279# Alaska 280# AK%sT is the modern abbreviation for -9:00 per USNO. 281# 282# From Paul Eggert (2001-05-30): 283# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 284# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 285# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 286# also a Friday. Include only the time zone part of this transition, 287# ignoring the switch from Julian to Gregorian, since we can't represent 288# the Julian calendar. 289# 290# As far as we know, none of the exact locations mentioned below were 291# permanently inhabited in 1867 by anyone using either calendar. 292# (Yakutat was colonized by the Russians in 1799, but the settlement 293# was destroyed in 1805 by a Yakutat-kon war party.) However, there 294# were nearby inhabitants in some cases and for our purposes perhaps 295# it's best to simply use the official transition. 296# 297# Zone NAME GMTOFF RULES FORMAT [UNTIL] 298Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 299 -8:57:41 - LMT 1900 Aug 20 12:00 300 -8:00 - PST 1942 301 -8:00 US P%sT 1946 302 -8:00 - PST 1969 303 -8:00 US P%sT 1983 Oct 30 2:00 304 -9:00 US AK%sT 305Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 306 -9:18:55 - LMT 1900 Aug 20 12:00 307 -9:00 - YST 1942 308 -9:00 US Y%sT 1946 309 -9:00 - YST 1969 310 -9:00 US Y%sT 1983 Oct 30 2:00 311 -9:00 US AK%sT 312Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 313 -9:59:36 - LMT 1900 Aug 20 12:00 314 -10:00 - CAT 1942 315 -10:00 US CAT/CAWT 1946 316 -10:00 - CAT 1967 Apr 317 -10:00 - AHST 1969 318 -10:00 US AH%sT 1983 Oct 30 2:00 319 -9:00 US AK%sT 320Zone America/Nome 12:58:21 - LMT 1867 Oct 18 321 -11:01:38 - LMT 1900 Aug 20 12:00 322 -11:00 - NST 1942 323 -11:00 US N%sT 1946 324 -11:00 - NST 1967 Apr 325 -11:00 - BST 1969 326 -11:00 US B%sT 1983 Oct 30 2:00 327 -9:00 US AK%sT 328Zone America/Adak 12:13:21 - LMT 1867 Oct 18 329 -11:46:38 - LMT 1900 Aug 20 12:00 330 -11:00 - NST 1942 331 -11:00 US N%sT 1946 332 -11:00 - NST 1967 Apr 333 -11:00 - BST 1969 334 -11:00 US B%sT 1983 Oct 30 2:00 335 -10:00 US HA%sT 336# Shanks writes that part of southwest Alaska (e.g. Aniak) 337# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 338# and another part (e.g. Akiak) made the same switch five weeks later. 339# These switches don't quite make our 1970 cutoff. 340 341# Hawaii 342# 343# From Arthur David Olson: 344# And then there's Hawaii. 345# DST was observed for one day in 1933; 346# standard time was changed by half an hour in 1947; 347# it's always standard as of 1986. 348# 349# From Paul Eggert: 350# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 351# 352Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 353 -10:30 - HST 1933 Apr 30 2:00 354 -10:30 1:00 HDT 1933 May 21 2:00 355 -10:30 US H%sT 1947 Jun 8 2:00 356 -10:00 - HST 357 358# Now we turn to US areas that have diverged from the consensus since 1970. 359 360# Arizona mostly uses MST. 361Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 362 -7:00 US M%sT 1944 Jan 1 00:01 363 -7:00 - MST 1944 Mar 17 00:01 364 -7:00 US M%sT 1944 Oct 1 00:01 365 -7:00 - MST 1967 366 -7:00 US M%sT 1968 367 -7:00 - MST 368# From Arthur David Olson (1988-02-13): 369# A writer from the Inter Tribal Council of Arizona, Inc., 370# notes in private correspondence dated 12/28/87 that "Presently, only the 371# Navajo Nation participates in the Daylight Saving Time policy, due to its 372# large size and location in three states." (The "only" means that other 373# tribal nations don't use DST.) 374 375Link America/Denver America/Shiprock 376 377# Southern Idaho and eastern Oregon switched four weeks late in 1974. 378# Zone NAME GMTOFF RULES FORMAT [UNTIL] 379Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 380 -8:00 US P%sT 1923 May 13 2:00 381 -7:00 US M%sT 1974 382 -7:00 - MST 1974 Feb 3 2:00 383 -7:00 US M%sT 384 385# Indiana 386# 387# For a map of Indiana's time zone regions, see: 388# <a href="http://www.mccsc.edu/time.html"> 389# What time is it in Indiana? 390# </a> (1999-04-06) 391# 392# From Paul Eggert (1995-12-19): 393# Indiana generally observes either EST all year, or CST/CDT, 394# but areas near Cincinnati and Louisville use those cities' timekeeping 395# and in 1969 and 1970 the whole state observed daylight time; 396# and there are other exceptions as noted below. 397# Shanks partitions Indiana into 345 regions, each with its own time history, 398# and writes ``Even newspaper reports present contradictory information.'' 399# Fortunately, most of the complexity occurred before our cutoff date of 1970. 400# 401# Since 1970, EST-only Indiana has been like America/Indianapolis, 402# with exceptions noted below for Crawford, Starke, and Switzerland counties. 403# The parts of Indiana not listed below have been like America/Chicago, 404# America/Louisville, or America/New_York. 405# 406# Other than Indianapolis, the Indiana place names are so nondescript 407# that they would be ambiguous if we left them at the `America' level. 408# So we reluctantly put them all in a subdirectory `America/Indiana'. 409# 410# Most of EST-only Indiana last observed DST in 1970. 411 412# From Paul Eggert (2001-03-06), following a tip by Markus Kuhn: 413# Pam Belluck reported in the New York Times (2001-01-31) that the 414# Indiana Legislature is considering a bill to adopt DST statewide. 415# Her article mentioned Vevay, whose post office observes a different 416# time zone from Danner's Hardware across the street. 417 418# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 419Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 420Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 421Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 422# Zone NAME GMTOFF RULES FORMAT [UNTIL] 423Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 424 -6:00 US C%sT 1920 425 -6:00 Indianapolis C%sT 1942 426 -6:00 US C%sT 1946 427 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 428 -5:00 - EST 1957 Sep 29 2:00 429 -6:00 - CST 1958 Apr 27 2:00 430 -5:00 - EST 1969 431 -5:00 US E%sT 1971 432 -5:00 - EST 433Link America/Indianapolis America/Indiana/Indianapolis 434# 435# Part of Crawford County, Indiana, last observed DST in 1975, 436# and left its clocks alone in 1974. 437# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 438Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 439Rule Marengo 1951 only - Sep lastSun 2:00 0 S 440Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 441Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 442# Zone NAME GMTOFF RULES FORMAT [UNTIL] 443Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 444 -6:00 US C%sT 1951 445 -6:00 Marengo C%sT 1961 Apr 30 2:00 446 -5:00 - EST 1969 447 -5:00 US E%sT 1974 Jan 6 2:00 448 -6:00 1:00 CDT 1974 Oct 27 2:00 449 -5:00 US E%sT 1976 450 -5:00 - EST 451# 452# Starke County, Indiana 453# From Arthur David Olson (1991-10-28): 454# An article on page A3 of the Sunday, 1991-10-27 Washington Post 455# notes that Starke County switched from Central time to Eastern time as of 456# 1991-10-27. 457# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 458Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 459Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 460Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 461Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 462Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 463# Zone NAME GMTOFF RULES FORMAT [UNTIL] 464Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 465 -6:00 US C%sT 1947 466 -6:00 Starke C%sT 1962 Apr 29 2:00 467 -5:00 - EST 1963 Oct 27 2:00 468 -6:00 US C%sT 1991 Oct 27 2:00 469 -5:00 - EST 470# 471# Switzerland County, Indiana, last observed DST in 1972. 472# Zone NAME GMTOFF RULES FORMAT [UNTIL] 473Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 474 -6:00 US C%sT 1954 Apr 25 2:00 475 -5:00 - EST 1969 476 -5:00 US E%sT 1973 477 -5:00 - EST 478 479# Part of Kentucky left its clocks alone in 1974. 480# This also includes a part of Indiana immediately adjacent to Louisville. 481# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 482Rule Louisville 1921 only - May 1 2:00 1:00 D 483Rule Louisville 1921 only - Sep 1 2:00 0 S 484Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 485Rule Louisville 1941 only - Sep lastSun 2:00 0 S 486Rule Louisville 1946 only - Jun 2 2:00 0 S 487Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 488Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 489# Zone NAME GMTOFF RULES FORMAT [UNTIL] 490Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 491 -6:00 US C%sT 1921 492 -6:00 Louisville C%sT 1942 493 -6:00 US C%sT 1946 494 -6:00 Louisville C%sT 1961 Jul 23 2:00 495 -5:00 - EST 1968 496 -5:00 US E%sT 1974 Jan 6 2:00 497 -6:00 1:00 CDT 1974 Oct 27 2:00 498 -5:00 US E%sT 499Link America/Louisville America/Kentucky/Louisville 500# 501# Wayne, Clinton, and Russell Counties, Kentucky 502# 503# From 504# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 505# Lake Cumberland LIFE 506# </a> (1999-01-29) via WKYM-101.7: 507# Clinton County has joined Wayne County in asking the DoT to change from 508# the Central to the Eastern time zone.... The Wayne County government made 509# the same request in December. And while Russell County officials have not 510# taken action, the majority of respondents to a poll conducted there in 511# August indicated they would like to change to "fast time" also. 512# The three Lake Cumberland counties are the farthest east of any U.S. 513# location in the Central time zone. 514# 515# From Rich Wales (2000-08-29): 516# After prolonged debate, and despite continuing deep differences of opinion, 517# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 518# (-0500) time. They won't "fall back" this year. See Sara Shipley, 519# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 520# 521# From Paul Eggert (2001-07-16): 522# The final rule was published in the 523# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> 524# Federal Register 65, 160 (2000-08-17), page 50154-50158. 525# </a> 526# 527Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:00 528 -6:00 US C%sT 1946 529 -6:00 - CST 1968 530 -6:00 US C%sT 2000 Oct 29 2:00 531 -5:00 US E%sT 532 533 534# From Rives McDow (2000-08-30): 535# Here ... are all the changes in the US since 1985. 536# Kearny County, KS (put all of county on central; 537# previously split between MST and CST) ... 1990-10 538# Starke County, IN (from CST to EST) ... 1991-10 539# Oliver County, ND (from MST to CST) ... 1992-10 540# West Wendover, NV (from PST TO MST) ... 1999-10 541# Wayne County, KY (from CST to EST) ... 2000-10 542# 543# From Paul Eggert (2001-07-17): 544# We don't know where the line used to be within Kearny County, KS, 545# so omit that change for now. 546# See America/Indiana/Knox for the Starke County, IN change. 547# See America/North_Dakota/Center for the Oliver County, ND change. 548# West Wendover, NV officially switched from Pacific to mountain time on 549# 1999-10-31. See the 550# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> 551# Federal Register 64, 203 (1999-10-21), page 56705-56707. 552# </a> 553# However, the Federal Register says that West Wendover already operated 554# on mountain time, and the rule merely made this official; 555# hence a separate tz entry is not needed. 556 557# Michigan 558# 559# From Bob Devine (1988-01-28): 560# Michigan didn't observe DST from 1968 to 1973. 561# 562# From Paul Eggert (1999-03-31): 563# Shanks writes that Michigan started using standard time on 1885-09-18, 564# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 565# that Detroit kept 566# 567# local time until 1900 when the City Council decreed that clocks should 568# be put back twenty-eight minutes to Central Standard Time. Half the 569# city obeyed, half refused. After considerable debate, the decision 570# was rescinded and the city reverted to Sun time. A derisive offer to 571# erect a sundial in front of the city hall was referred to the 572# Committee on Sewers. Then, in 1905, Central time was adopted 573# by city vote. 574# 575# This story is too entertaining to be false, so go with Howse over Shanks. 576# 577# From Paul Eggert (2001-03-06): 578# Garland (1927) writes ``Cleveland and Detroit advanced their clocks 579# one hour in 1914.'' This change is not in Shanks. We have no more 580# info, so omit this for now. 581# 582# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 583# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 584Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 585Rule Detroit 1948 only - Sep lastSun 2:00 0 S 586Rule Detroit 1967 only - Jun 14 2:00 1:00 D 587Rule Detroit 1967 only - Oct lastSun 2:00 0 S 588# Zone NAME GMTOFF RULES FORMAT [UNTIL] 589Zone America/Detroit -5:32:11 - LMT 1905 590 -6:00 - CST 1915 May 15 2:00 591 -5:00 - EST 1942 592 -5:00 US E%sT 1946 593 -5:00 Detroit E%sT 1973 594 -5:00 US E%sT 1975 595 -5:00 - EST 1975 Apr 27 2:00 596 -5:00 US E%sT 597# 598# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 599# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 600Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 601Rule Menominee 1946 only - Sep lastSun 2:00 0 S 602Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 603Rule Menominee 1966 only - Oct lastSun 2:00 0 S 604# Zone NAME GMTOFF RULES FORMAT [UNTIL] 605Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 606 -6:00 US C%sT 1946 607 -6:00 Menominee C%sT 1969 Apr 27 2:00 608 -5:00 - EST 1973 Apr 29 2:00 609 -6:00 US C%sT 610 611# Navassa 612# administered by the US Fish and Wildlife Service 613# claimed by US under the provisions of the 1856 Guano Islands Act 614# also claimed by Haiti 615# occupied 1857/1900 by the Navassa Phosphate Co 616# US lighthouse 1917/1996-09 617# currently uninhabited 618# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 619# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 620# Jimmy Skaggs, _The Great Guano Rush_ (1994). 621 622# Old names, for S5 users 623 624# Link LINK-FROM LINK-TO 625Link America/New_York EST5EDT 626Link America/Chicago CST6CDT 627Link America/Denver MST7MDT 628Link America/Los_Angeles PST8PDT 629Link America/Indianapolis EST 630Link America/Phoenix MST 631Link Pacific/Honolulu HST 632 633################################################################################ 634 635 636# From Paul Eggert <eggert@twinsun.com> (1999-10-29): 637# A good source for time zone historical data outside the US is 638# Thomas G. Shanks, The International Atlas (5th edition), 639# San Diego: ACS Publications, Inc. (1999). 640# 641# Gwillim Law writes that a good source 642# for recent time zone data is the International Air Transport 643# Association's Standard Schedules Information Manual (IATA SSIM), 644# published semiannually. Law sent in several helpful summaries 645# of the IATA's data after 1990. 646# 647# Except where otherwise noted, Shanks is the source for entries through 1990, 648# and IATA SSIM is the source for entries after 1990. 649# 650# Another source occasionally used is Edward W. Whitman, World Time Differences, 651# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 652# I found in the UCLA library. 653# 654# See the `europe' file for Greenland. 655 656# Canada 657 658# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 659# I post here the time zone abbreviations standardized in Canada 660# for both English and French in the CAN/CSA-Z234.4-89 standard.... 661# 662# UTC Standard time Daylight savings time 663# offset French English French English 664# -2:30 - - HAT NDT 665# -3 - - HAA ADT 666# -3:30 HNT NST - - 667# -4 HNA AST HAE EDT 668# -5 HNE EST HAC CDT 669# -6 HNC CST HAR MDT 670# -7 HNR MST HAP PDT 671# -8 HNP PST HAY YDT 672# -9 HNY YST - - 673# 674# HN: Heure Normale ST: Standard Time 675# HA: Heure Avanc<e'>e DT: Daylight saving Time 676# 677# A: de l'Atlantique Atlantic 678# C: du Centre Central 679# E: de l'Est Eastern 680# M: Mountain 681# N: Newfoundland 682# P: du Pacifique Pacific 683# R: des Rocheuses 684# T: de Terre-Neuve 685# Y: du Yukon Yukon 686# 687# From Paul Eggert <eggert@twinsun.com> (1994-11-22): 688# Alas, this sort of thing must be handled by localization software. 689 690# Unless otherwise specified, the data for Canada are all from Shanks. 691 692# From Paul Eggert (2000-10-02): 693# H. David Matthews and Mary Vincent's map 694# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm"> 695# "It's about TIME", _Canadian Geographic_ (September-October 1998) 696# </a> contains detailed boundaries for regions observing nonstandard 697# time and daylight saving time arrangements in Canada circa 1998. 698# 699# INMS, the Institute for National Measurement Standards in Ottawa, has 700# <a href="http://www.nrc.ca/inms/time/tze.html"> 701# information about standard and daylight saving time zones in Canada. 702# </a> (updated periodically). 703# Its unofficial information is often taken from Matthews and Vincent. 704 705# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 706Rule Canada 1918 only - Apr 14 2:00 1:00 D 707Rule Canada 1918 only - Oct 31 2:00 0 S 708Rule Canada 1942 only - Feb 9 2:00 1:00 W 709Rule Canada 1945 only - Sep 30 2:00 0 S 710Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 711Rule Canada 1974 max - Oct lastSun 2:00 0 S 712Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 713 714 715# Newfoundland (and far southeast Labrador) 716 717# From Paul Eggert (2000-10-02): 718# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 719# but the only part of Labrador that follows the rules is the 720# southeast corner, including Port Hope Simpson and Mary's Harbour, 721# but excluding, say, Black Tickle. 722 723# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 724Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 725Rule StJohns 1917 only - Sep 17 2:00 0 S 726Rule StJohns 1918 only - Oct 31 2:00 0 S 727# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 728Rule StJohns 1919 only - May 5 23:00 1:00 D 729Rule StJohns 1919 only - Aug 12 23:00 0 S 730# For 1931-1935 Whitman gives Apr same date; go with Shanks. 731Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 732Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 733# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 734Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 735Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 736# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 737Rule StJohns 1942 only - Mar 1 0:00 1:00 W 738Rule StJohns 1942 only - Dec 31 0:00 0 S 739Rule StJohns 1943 only - May 30 0:00 1:00 W 740Rule StJohns 1943 only - Sep 5 0:00 0 S 741Rule StJohns 1944 only - Jul 10 0:00 1:00 W 742Rule StJohns 1944 only - Sep 2 0:00 0 S 743Rule StJohns 1945 only - Jan 1 0:00 1:00 W 744Rule StJohns 1945 only - Oct 7 2:00 0 S 745# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 746# Apr 30 - Sep 24; go with Shanks. 747Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 748Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 749Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 750Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 751Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 752# From Paul Eggert (2000-10-02): 753# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 754# at 00:01 local time. For now, assume it started in 1987. 755Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 756Rule StJohns 1987 max - Oct lastSun 0:01 0 S 757Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 758Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D 759# St John's has an apostrophe, but Posix file names can't have apostrophes. 760# Zone NAME GMTOFF RULES FORMAT [UNTIL] 761Zone America/St_Johns -3:30:52 - LMT 1884 762 -3:30:52 StJohns N%sT 1935 Mar 30 763 -3:30 StJohns N%sT 764 765 766# most of east Labrador 767 768# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 769# Zone NAME GMTOFF RULES FORMAT [UNTIL] 770Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 771 -3:30:52 StJohns NST 1919 772 -3:30:52 - NST 1935 Mar 30 773 -3:30 - NST 1936 774 -3:30 StJohns N%sT 1966 Mar 15 2:00 775 -4:00 StJohns A%sT 776 777 778# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 779 780# From Paul Eggert (1996-06-12): 781# Shanks writes that since 1970 most of this region has been like Halifax. 782# Many locales did not observe peacetime DST until 1972; 783# Glace Bay, NS is the largest that we know of. 784# Shanks also writes that Liverpool, NS was the only town in Canada to observe 785# DST in 1971 but not 1970; for now we'll assume this is a typo. 786 787# From Paul Eggert (2000-10-02): 788# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches 789# at 00:01 local time. FIXME: verify and create a new Zone for this. 790 791 792# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 793Rule Halifax 1916 only - Apr 1 0:00 1:00 D 794Rule Halifax 1916 only - Oct 1 0:00 0 S 795Rule Halifax 1918 only - Apr 14 2:00 1:00 D 796Rule Halifax 1918 only - Oct 31 2:00 0 S 797Rule Halifax 1920 only - May 9 0:00 1:00 D 798Rule Halifax 1920 only - Aug 29 0:00 0 S 799Rule Halifax 1921 only - May 6 0:00 1:00 D 800Rule Halifax 1921 1922 - Sep 5 0:00 0 S 801Rule Halifax 1922 only - Apr 30 0:00 1:00 D 802Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 803Rule Halifax 1923 only - Sep 4 0:00 0 S 804Rule Halifax 1924 only - Sep 15 0:00 0 S 805Rule Halifax 1925 only - Sep 28 0:00 0 S 806Rule Halifax 1926 only - May 16 0:00 1:00 D 807Rule Halifax 1926 only - Sep 13 0:00 0 S 808Rule Halifax 1927 only - May 1 0:00 1:00 D 809Rule Halifax 1927 only - Sep 26 0:00 0 S 810Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 811Rule Halifax 1928 only - Sep 9 0:00 0 S 812Rule Halifax 1929 only - Sep 3 0:00 0 S 813Rule Halifax 1930 only - Sep 15 0:00 0 S 814Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 815Rule Halifax 1933 only - Apr 30 0:00 1:00 D 816Rule Halifax 1933 only - Oct 2 0:00 0 S 817Rule Halifax 1934 only - May 20 0:00 1:00 D 818Rule Halifax 1934 only - Sep 16 0:00 0 S 819Rule Halifax 1935 only - Jun 2 0:00 1:00 D 820Rule Halifax 1935 only - Sep 30 0:00 0 S 821Rule Halifax 1936 only - Jun 1 0:00 1:00 D 822Rule Halifax 1936 only - Sep 14 0:00 0 S 823Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 824Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 825Rule Halifax 1939 only - May 28 0:00 1:00 D 826Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 827Rule Halifax 1942 only - Feb 9 2:00 1:00 W 828Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S 829Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 830Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 831Rule Halifax 1962 max - Oct lastSun 2:00 0 S 832Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 833# Zone NAME GMTOFF RULES FORMAT [UNTIL] 834Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 835 -4:00 Halifax A%sT 836Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 837 -4:00 Canada A%sT 1953 838 -4:00 Halifax A%sT 1954 839 -4:00 - AST 1972 840 -4:00 Halifax A%sT 841 842 843# Ontario, Quebec 844 845# From Paul Eggert (1996-06-12): 846# Shanks writes that since 1970 most of this region has been like Montreal. 847# Thunder Bay skipped DST in 1973. 848# Many smaller locales did not observe peacetime DST until 1974; 849# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 850# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 851 852# From Paul Eggert (1997-10-17): 853# msb@sq.com writes that an article in the 1997-10-14 Toronto Star 854# says that Atikokan, Ontario currently does not observe DST, 855# but will vote on 11-10 whether to use EST/EDT. 856# He also writes that the 857# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 858# Ontario Time Act (1990, Chapter T.9) 859# </a> 860# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 861# Officially Atikokan is therefore on CST/CDT, and most likely this report 862# concerns a non-official time observed as a matter of local practice. 863# For what it's worth, Shanks says that Atikokan has agreed with 864# Rainy River ever since standard time was introduced. 865 866# From Paul Eggert (2000-10-02): 867# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 868# New Osnaburgh observe CST all year, that Big Trout Lake observes 869# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 870# violation of the official Ontario rules. 871# They also write that Quebec east of the -63 meridian is supposed to 872# observe AST, but residents as far east as Natashquan use EST/EDT, 873# and residents east of Natashquan use AST. 874# We probably need Zones for far east Quebec and for Atikokan, 875# but we don't know when their practices started. 876 877# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 878Rule Mont 1917 only - Mar 25 2:00 1:00 D 879Rule Mont 1917 only - Apr 24 0:00 0 S 880Rule Mont 1918 only - Apr 14 2:00 1:00 D 881Rule Mont 1918 only - Oct 31 2:00 0 S 882Rule Mont 1919 only - Mar 31 2:30 1:00 D 883Rule Mont 1919 only - Oct 25 2:30 0 S 884Rule Mont 1920 only - May 2 2:30 1:00 D 885Rule Mont 1920 only - Oct 3 2:30 0 S 886Rule Mont 1921 only - May 1 2:00 1:00 D 887Rule Mont 1921 only - Oct 2 2:30 0 S 888Rule Mont 1922 only - Apr 30 2:00 1:00 D 889Rule Mont 1922 only - Oct 1 2:30 0 S 890Rule Mont 1924 only - May 17 2:00 1:00 D 891Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 892Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 893Rule Mont 1927 only - May 1 0:00 1:00 D 894Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 895Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 896Rule Mont 1932 only - May 1 0:00 1:00 D 897Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 898Rule Mont 1933 only - Oct 1 0:00 0 S 899Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 900Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 901Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 902Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 903Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 904Rule Mont 1957 max - Oct lastSun 2:00 0 S 905Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 906# Zone NAME GMTOFF RULES FORMAT [UNTIL] 907Zone America/Montreal -4:54:16 - LMT 1884 908 -5:00 Mont E%sT 909Zone America/Thunder_Bay -5:57:00 - LMT 1895 910 -5:00 Canada E%sT 1970 911 -5:00 Mont E%sT 1973 912 -5:00 - EST 1974 913 -5:00 Canada E%sT 914Zone America/Nipigon -5:53:04 - LMT 1895 915 -5:00 Canada E%sT 916Zone America/Rainy_River -6:17:56 - LMT 1895 917 -6:00 Canada C%sT 918 919 920# Manitoba 921 922# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 923Rule Winn 1916 only - Apr 23 0:00 1:00 D 924Rule Winn 1916 only - Sep 17 0:00 0 S 925Rule Winn 1918 only - Apr 14 2:00 1:00 D 926Rule Winn 1918 only - Oct 31 2:00 0 S 927Rule Winn 1937 only - May 16 2:00 1:00 D 928Rule Winn 1937 only - Sep 26 2:00 0 S 929Rule Winn 1942 only - Feb 9 2:00 1:00 W 930Rule Winn 1945 only - Sep lastSun 2:00 0 S 931Rule Winn 1946 only - May 12 2:00 1:00 D 932Rule Winn 1946 only - Oct 13 2:00 0 S 933Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 934Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 935Rule Winn 1950 only - May 1 2:00 1:00 D 936Rule Winn 1950 only - Sep 30 2:00 0 S 937Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 938Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 939Rule Winn 1959 only - Oct lastSun 2:00 0 S 940Rule Winn 1960 only - Sep lastSun 2:00 0 S 941Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 942Rule Winn 1963 only - Sep 22 2:00 0 S 943Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 944Rule Winn 1966 1986 - Oct lastSun 2:00 0 S 945Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 946# From Paul Eggert (2000-10-02): 947# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from 948# DST at 03:00 local time. For now, assume it started in 1987. 949Rule Winn 1987 max - Oct lastSun 2:00s 0 S 950# Zone NAME GMTOFF RULES FORMAT [UNTIL] 951Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 952 -6:00 Winn C%sT 953 954 955# Saskatchewan 956 957# From Paul Eggert (2000-10-02): 958# Shanks writes that since 1970 most of this region has been like Regina. 959# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 960# Other western towns (e.g. Lloydminster) are like Edmonton. 961# Matthews and Vincent (1998) write that Denare Beach and Creighton 962# are like Winnipeg, in violation of Saskatchewan law. 963 964# From W. Jones <jones@skdad.usask.ca> (1992-11-06): 965# The. . .below is based on information I got from our law library, the 966# provincial archives, and the provincial Community Services department. 967# A precise history would require digging through newspaper archives, and 968# since you didn't say what you wanted, I didn't bother. 969# 970# Saskatchewan is split by a time zone meridian (105W) and over the years 971# the boundary became pretty ragged as communities near it reevaluated 972# their affiliations in one direction or the other. In 1965 a provincial 973# referendum favoured legislating common time practices. 974# 975# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 976# Saskatchewan 1978) was proclaimed, and established that the eastern 977# part of Saskatchewan would use CST year round, that districts in 978# northwest Saskatchewan would by default follow CST but could opt to 979# follow Mountain Time rules (thus 1 hour difference in the winter and 980# zero in the summer), and that districts in southwest Saskatchewan would 981# by default follow MT but could opt to follow CST. 982# 983# It took a few years for the dust to settle (I know one story of a town 984# on one time zone having its school in another, such that a mom had to 985# serve her family lunch in two shifts), but presently it seems that only 986# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 987# rules any more; all other districts appear to have used CST year round 988# since sometime in the 1960s. 989 990# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 991Rule Regina 1918 only - Apr 14 2:00 1:00 D 992Rule Regina 1918 only - Oct 31 2:00 0 S 993Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 994Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 995Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 996Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 997Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 998Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 999Rule Regina 1942 only - Feb 9 2:00 1:00 W 1000Rule Regina 1945 only - Sep lastSun 2:00 0 S 1001Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1002Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1003Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D 1004Rule Regina 1947 1958 - Sep lastSun 2:00 0 S 1005Rule Regina 1959 only - Oct lastSun 2:00 0 S 1006# 1007Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1008Rule Swift 1957 only - Oct lastSun 2:00 0 S 1009Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1010Rule Swift 1959 only - Oct lastSun 2:00 0 S 1011Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1012# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1013Zone America/Regina -6:58:36 - LMT 1905 Sep 1014 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1015 -6:00 - CST 1016Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1017 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1018 -7:00 Regina M%sT 1950 1019 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1020 -6:00 - CST 1021 1022 1023# Alberta 1024 1025# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1026Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1027Rule Edm 1918 only - Oct 31 2:00 0 S 1028Rule Edm 1919 only - May 27 2:00 0 S 1029Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1030Rule Edm 1920 only - Oct lastSun 2:00 0 S 1031Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1032Rule Edm 1942 only - Feb 9 2:00 1:00 W 1033Rule Edm 1945 only - Sep lastSun 2:00 0 S 1034Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1035Rule Edm 1947 only - Sep lastSun 2:00 0 S 1036Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1037Rule Edm 1967 only - Oct lastSun 2:00 0 S 1038Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1039Rule Edm 1969 only - Oct lastSun 2:00 0 S 1040Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1041Rule Edm 1972 max - Oct lastSun 2:00 0 S 1042Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 1043# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1044Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1045 -7:00 Edm M%sT 1046 1047 1048# British Columbia 1049 1050# From Paul Eggert (2000-10-02): 1051# Shanks writes that since 1970 most of this region has been like Vancouver. 1052# Dawson Creek uses MST. Much of east BC is like Edmonton. 1053# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1054 1055# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1056Rule Vanc 1918 only - Apr 14 2:00 1:00 D 1057Rule Vanc 1918 only - Oct 31 2:00 0 S 1058Rule Vanc 1942 only - Feb 9 2:00 1:00 W 1059Rule Vanc 1945 only - Sep 30 2:00 0 S 1060Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 1061Rule Vanc 1946 only - Oct 13 2:00 0 S 1062Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 1063Rule Vanc 1962 max - Oct lastSun 2:00 0 S 1064Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 1065# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1066Zone America/Vancouver -8:12:28 - LMT 1884 1067 -8:00 Vanc P%sT 1068Zone America/Dawson_Creek -8:00:56 - LMT 1884 1069 -8:00 Canada P%sT 1947 1070 -8:00 Vanc P%sT 1972 Aug 30 2:00 1071 -7:00 - MST 1072 1073 1074# Northwest Territories, Nunavut, Yukon 1075 1076# From Paul Eggert (1999-10-29): 1077# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 1078# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs: 1079# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 1080# c. 7 defines Yukon standard time as UTC-9. This is still valid; 1081# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 1082# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 1083# * O.I.C. 1980/02 established DST. 1084# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 1085# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 1086 1087# From Rives McDow (1999-09-04): 1088# Nunavut ... moved ... to incorporate the whole territory into one time zone. 1089# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 1090# Nunavut moves to single time zone Oct. 31 1091# </a> 1092# 1093# From Antoine Leca (1999-09-06): 1094# We then need to create a new timezone for the Kitikmeot region of Nunavut 1095# to differentiate it from the Yellowknife region. 1096 1097# From Paul Eggert (1999-09-20): 1098# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 1099# Basic Facts: The New Territory 1100# </a> (1999) reports that Pangnirtung operates on eastern time, 1101# and that Coral Harbour does not observe DST. We don't know when 1102# Pangnirtung switched to eastern time; we'll guess 1995. 1103# We'll ignore the claim about Coral Harbour for now, 1104# since we have no further info. 1105 1106# From Rives McDow (1999-11-08): 1107# On October 31, when the rest of Nunavut went to Central time, 1108# Pangnirtung wobbled. Here is the result of their wobble: 1109# 1110# The following businesses and organizations in Pangnirtung use Central Time: 1111# 1112# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 1113# Eastern Arctic National Parks, A & D Specialist 1114# 1115# The following businesses and organizations in Pangnirtung use Eastern Time: 1116# 1117# Hamlet office, All other businesses, Both schools, Airport operator 1118# 1119# This has made for an interesting situation there, which warranted the news. 1120# No one there that I spoke with seems concerned, or has plans to 1121# change the local methods of keeping time, as it evidently does not 1122# really interfere with any activities or make things difficult locally. 1123# They plan to celebrate New Year's turn-over twice, one hour apart, 1124# so it appears that the situation will last at least that long. 1125# The Nunavut Intergovernmental Affairs hopes that they will "come to 1126# their senses", but the locals evidently don't see any problem with 1127# the current state of affairs. 1128 1129# From Michaela Rodrigue, writing in the 1130# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 1131# Nunatsiaq News (1999-11-19)</a>: 1132# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 1133# central - or Nunavut time - for government offices, and eastern time 1134# for municipal offices and schools.... Igloolik [was similar but then] 1135# made the switch to central time on Saturday, Nov. 6. 1136 1137# From Paul Eggert (2000-10-02): 1138# Matthews and Vincent (1998) say the following, but we lack histories 1139# for these potential new Zones. 1140# 1141# The Canadian Forces station at Alert uses Eastern Time while the 1142# handful of residents at the Eureka weather station [in the Central 1143# zone] skip daylight savings. Baffin Island, which is crossed by the 1144# Central, Eastern and Atlantic Time zones only uses Eastern Time. 1145# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 1146# Central Time and Southampton Island [in the Central zone] is not 1147# required to use daylight savings. 1148 1149# From 1150# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> 1151# Nunavut now has two time zones 1152# </a> (2000-11-10): 1153# The Nunavut government would allow its employees in Kugluktuk and 1154# Cambridge Bay to operate on central time year-round, putting them 1155# one hour behind the rest of Nunavut for six months during the winter. 1156# At the end of October the two communities had rebelled against 1157# Nunavut's unified time zone, refusing to shift to eastern time with 1158# the rest of the territory for the winter. Cambridge Bay remained on 1159# central time, while Kugluktuk, even farther west, reverted to 1160# mountain time, which they had used before the advent of Nunavut's 1161# unified time zone in 1999. 1162# 1163# From Rives McDow (2001-01-20), quoting the Nunavut government: 1164# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 1165 1166# From Paul Eggert (2000-12-04): 1167# Let's just keep track of the official times for now. 1168 1169# From Rives McDow (2001-03-07): 1170# The premier of Nunavut has issued a ministerial statement advising 1171# that effective 2001-04-01, the territory of Nunavut will revert 1172# back to three time zones (mountain, central, and eastern). Of the 1173# cities in Nunavut, Coral Harbor is the only one that I know of that 1174# has said it will not observe dst, staying on EST year round. I'm 1175# checking for more info, and will get back to you if I come up with 1176# more. 1177# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 1178 1179# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1180Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 1181Rule NT_YK 1918 only - Oct 27 2:00 0 S 1182Rule NT_YK 1919 only - May 25 2:00 1:00 D 1183Rule NT_YK 1919 only - Nov 1 0:00 0 S 1184Rule NT_YK 1942 only - Feb 9 2:00 1:00 W 1185Rule NT_YK 1945 only - Sep 30 2:00 0 S 1186Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 1187Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 1188Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 1189Rule NT_YK 1980 max - Oct lastSun 2:00 0 S 1190Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 1191# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1192Zone America/Pangnirtung -4:22:56 - LMT 1884 1193 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 1194 -5:00 Canada E%sT 1999 Oct 31 2:00 1195 -6:00 Canada C%sT 2000 Oct 29 2:00 1196 -5:00 Canada E%sT 1197Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 1198 -5:00 NT_YK E%sT 1999 Oct 31 2:00 1199 -6:00 Canada C%sT 2000 Oct 29 2:00 1200 -5:00 Canada E%sT 1201Zone America/Rankin_Inlet -6:08:40 - LMT 1884 1202 -6:00 NT_YK C%sT 2000 Oct 29 2:00 1203 -5:00 - EST 2001 Apr 1 3:00 1204 -6:00 Canada C%sT 1205Zone America/Cambridge_Bay -7:00:20 - LMT 1884 1206 -7:00 NT_YK M%sT 1999 Oct 31 2:00 1207 -6:00 Canada C%sT 2000 Oct 29 2:00 1208 -5:00 - EST 2000 Nov 5 0:00 1209 -6:00 - CST 2001 Apr 1 3:00 1210 -7:00 Canada M%sT 1211Zone America/Yellowknife -7:37:24 - LMT 1884 1212 -7:00 NT_YK M%sT 1213Zone America/Inuvik -8:54:00 - LMT 1884 1214 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 1215 -7:00 NT_YK M%sT 1216Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 1217 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 1218 -8:00 NT_YK P%sT 1219Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 1220 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 1221 -8:00 NT_YK P%sT 1222 1223 1224############################################################################### 1225 1226# Mexico 1227 1228# From Paul Eggert (2001-03-05): 1229# The Investigation and Analysis Service of the 1230# Mexican Library of Congress (MLoC) has published a 1231# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> 1232# history of Mexican local time (in Spanish) 1233# </a>. 1234# 1235# Here are the discrepancies between Shanks and the MLoC. 1236# (In all cases we go with the MLoC.) 1237# Shanks reports that Baja was at -8:00 in 1922/1923. 1238# Shanks says the 1930 transition in Baja was 1930-11-16. 1239# Shanks reports no DST during summer 1931. 1240# Shanks reports a transition at 1032-03-30 23:00, not 1932-04-01. 1241# Shanks does not report transitions for Baja in 1945 or 1948. 1242# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23. 1243# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00 1244# on 1997-10-26 at 02:00. 1245 1246# From Gwillim Law (2001-02-20): 1247# There are some other discrepancies between the Decrees page and the 1248# tz database. I think they can best be explained by supposing that 1249# the researchers who prepared the Decrees page failed to find some of 1250# the relevant documents. 1251 1252# From Paul Eggert (2000-07-26): 1253# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 1254# and 1988 DST experiments. Go with spin.com.mx. 1255 1256# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15): 1257# A guy from our Mexico subsidiary finally found the Presidential Decree 1258# outlining the timezone changes in Mexico. 1259# 1260# ------------- Begin Forwarded Message ------------- 1261# 1262# I finally got my hands on the Official Presidential Decree that sets up the 1263# rules for the DST changes. The rules are: 1264# 1265# 1. The country is divided in 3 timezones: 1266# - Baja California Norte (the Mexico/BajaNorte TZ) 1267# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 1268# - The rest of the country (the Mexico/General TZ) 1269# 1270# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 1271# at 2:00 AM, the times in each zone are as follows: 1272# BajaNorte: GMT+7 1273# BajaSur: GMT+6 1274# General: GMT+5 1275# 1276# 3. The rest of the year, the times are as follows: 1277# BajaNorte: GMT+8 1278# BajaSur: GMT+7 1279# General: GMT+6 1280# 1281# The Decree was published in Mexico's Official Newspaper on January 4th. 1282# 1283# -------------- End Forwarded Message -------------- 1284# From Paul Eggert (1996-06-12): 1285# For an English translation of the decree, see 1286# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 1287# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 1288# </a> 1289 1290# From Rives McDow (1998-10-08): 1291# The State of Quintana Roo has reverted back to central STD and DST times 1292# (i.e. UTC -0600 and -0500 as of 1998-08-02). 1293 1294# From Rives McDow (2000-01-10): 1295# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 1296# zone 5 hours from the International Date Line, and will not observe daylight 1297# savings time so as to stay on the same time zone as the southern part of 1298# Arizona year round. 1299 1300# From Jesper Norgaard, translating 1301# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 1302# In Oaxaca, the 55.000 teachers from the Section 22 of the National 1303# Syndicate of Education Workers, refuse to apply daylight saving each 1304# year, so that the more than 10,000 schools work at normal hour the 1305# whole year. 1306 1307# From Gwillim Law (2001-01-19): 1308# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 1309# (translated):... 1310# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 1311# that Summer Time will be reduced from seven to five months, starting 1312# this year.... 1313# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> 1314# [translated], says "summer time will ... take effect on the first Sunday 1315# in May, and end on the last Sunday of September. 1316 1317# From Arthur David Olson (2001-01-25): 1318# The 2001-01-24 traditional Washington Post contained the page one 1319# story "Timely Issue Divides Mexicans."... 1320# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 1321# ... Mexico City Mayor Lopez Obrador "...is threatening to keep 1322# Mexico City and its 20 million residents on a different time than 1323# the rest of the country..." In particular, Lopez Obrador would abolish 1324# observation of Daylight Saving Time. 1325 1326# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> 1327# Official statute published by the Energy Department 1328# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 1329# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). 1330 1331# From Paul Eggert (2001-03-03): 1332# 1333# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> 1334# James F. Smith writes in today's LA Times 1335# </a> 1336# * Sonora will continue to observe standard time. 1337# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that 1338# the Federal District will not adopt DST. 1339# * 4 of 16 district leaders announced they'll ignore the decree. 1340# * The decree does not affect federal-controlled facilities including 1341# the airport, banks, hospitals, and schools. 1342# 1343# For now we'll assume that the Federal District will bow to federal rules. 1344 1345# From Jesper Norgaard (2001-04-01): 1346# I found some references to the Mexican application of daylight 1347# saving, which modifies what I had already sent you, stating earlier 1348# that a number of northern Mexican states would go on daylight 1349# saving. The modification reverts this to only cover Baja California 1350# (Norte), while all other states (except Sonora, who has no daylight 1351# saving all year) will follow the original decree of president 1352# Vicente Fox, starting daylight saving May 6, 2001 and ending 1353# September 30, 2001. 1354# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> 1355# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 1356 1357# From Reuters (2001-09-04): 1358# Mexico's Supreme Court on Tuesday declared that daylight savings was 1359# unconstitutional in Mexico City, creating the possibility the 1360# capital will be in a different time zone from the rest of the nation 1361# next year.... The Supreme Court's ruling takes effect at 2:00 1362# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 1363# standard time. "This is so residents of the Federal District are not 1364# subject to unexpected time changes," a statement from the court said. 1365 1366# From Jesper Norgaard Welen (2002-03-12): 1367# ... consulting my local grocery store(!) and my coworkers, they all insisted 1368# that a new decision had been made to reinstate US style DST in Mexico.... 1369# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 1370# confirms this. Sonora as usual is the only state where DST is not applied. 1371 1372# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1373Rule Mexico 1939 only - Feb 5 0:00 1:00 D 1374Rule Mexico 1939 only - Jun 25 0:00 0 S 1375Rule Mexico 1940 only - Dec 9 0:00 1:00 D 1376Rule Mexico 1941 only - Apr 1 0:00 0 S 1377Rule Mexico 1943 only - Dec 16 0:00 1:00 W 1378Rule Mexico 1944 only - May 1 0:00 0 S 1379Rule Mexico 1950 only - Feb 12 0:00 1:00 D 1380Rule Mexico 1950 only - Jul 30 0:00 0 S 1381Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 1382Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 1383Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 1384Rule Mexico 2001 only - Sep lastSun 2:00 0 S 1385Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 1386Rule Mexico 2002 max - Oct lastSun 2:00 0 S 1387# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1388# Quintana Roo 1389Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 1390 -6:00 - CST 1981 Dec 23 1391 -5:00 Mexico E%sT 1998 Aug 2 2:00 1392 -6:00 Mexico C%sT 1393# Campeche, Yucatan 1394Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 1395 -6:00 - CST 1981 Dec 23 1396 -5:00 - EST 1982 Dec 2 1397 -6:00 Mexico C%sT 1398# Coahuila, Durango, Nuevo Leon, Tamaulipas 1399Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 1400 -6:00 - CST 1988 1401 -6:00 US C%sT 1989 1402 -6:00 Mexico C%sT 1403# Central Mexico 1404Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 1405 -7:00 - MST 1927 Jun 10 23:00 1406 -6:00 - CST 1930 Nov 15 1407 -7:00 - MST 1931 May 1 23:00 1408 -6:00 - CST 1931 Oct 1409 -7:00 - MST 1932 Apr 1 1410 -6:00 Mexico C%sT 2001 Sep 30 02:00 1411 -6:00 - CST 2002 Feb 20 1412 -6:00 Mexico C%sT 1413# Chihuahua 1414Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 1415 -7:00 - MST 1927 Jun 10 23:00 1416 -6:00 - CST 1930 Nov 15 1417 -7:00 - MST 1931 May 1 23:00 1418 -6:00 - CST 1931 Oct 1419 -7:00 - MST 1932 Apr 1 1420 -6:00 - CST 1996 1421 -6:00 Mexico C%sT 1998 1422 -6:00 - CST 1998 Apr Sun>=1 3:00 1423 -7:00 Mexico M%sT 1424# Sonora 1425Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 1426 -7:00 - MST 1927 Jun 10 23:00 1427 -6:00 - CST 1930 Nov 15 1428 -7:00 - MST 1931 May 1 23:00 1429 -6:00 - CST 1931 Oct 1430 -7:00 - MST 1932 Apr 1 1431 -6:00 - CST 1942 Apr 24 1432 -7:00 - MST 1949 Jan 14 1433 -8:00 - PST 1970 1434 -7:00 Mexico M%sT 1999 1435 -7:00 - MST 1436# Baja California Sur, Nayarit, Sinaloa 1437Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 1438 -7:00 - MST 1927 Jun 10 23:00 1439 -6:00 - CST 1930 Nov 15 1440 -7:00 - MST 1931 May 1 23:00 1441 -6:00 - CST 1931 Oct 1442 -7:00 - MST 1932 Apr 1 1443 -6:00 - CST 1942 Apr 24 1444 -7:00 - MST 1949 Jan 14 1445 -8:00 - PST 1970 1446 -7:00 Mexico M%sT 1447# Baja California 1448Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 1449 -7:00 - MST 1924 1450 -8:00 - PST 1927 Jun 10 23:00 1451 -7:00 - MST 1930 Nov 15 1452 -8:00 - PST 1931 Apr 1 1453 -8:00 1:00 PDT 1931 Sep 30 1454 -8:00 - PST 1942 Apr 24 1455 -8:00 1:00 PWT 1945 Nov 12 1456 -8:00 - PST 1948 Apr 5 1457 -8:00 1:00 PDT 1949 Jan 14 1458 -8:00 - PST 1954 1459 -8:00 CA P%sT 1961 1460 -8:00 - PST 1976 1461 -8:00 US P%sT 1996 1462 -8:00 Mexico P%sT 2001 1463 -8:00 US P%sT 2002 Feb 20 1464 -8:00 Mexico P%sT 1465# From Paul Eggert (2001-03-05): 1466# Formerly there was an America/Ensenada zone, which differed from 1467# America/Tijuana only in that it did not observe DST from 1976 1468# through 1995. This was as per Shanks. However, Guy Harris reports 1469# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and 1470# Tijuana observe DST," which contradicts Shanks but does imply that 1471# DST-observance was a town-by-town matter back then. This concerns 1472# data after 1970 so most likely there should be at least one Zone 1473# other than America/Tijuana for Baja, but it's not clear yet what its 1474# name or contents should be. 1475# 1476# Revillagigedo Is 1477# no information 1478 1479############################################################################### 1480 1481# Anguilla 1482# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1483Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 1484 -4:00 - AST 1485 1486# Antigua and Barbuda 1487# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1488Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 1489 -5:00 - EST 1951 1490 -4:00 - AST 1491 1492# Bahamas 1493# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1494Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 1495Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 1496Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 1497# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1498Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 1499 -5:00 Bahamas E%sT 1500 1501# Barbados 1502# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1503Rule Barb 1977 only - Jun 12 2:00 1:00 D 1504Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1505Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1506Rule Barb 1979 only - Sep 30 2:00 0 S 1507Rule Barb 1980 only - Sep 25 2:00 0 S 1508# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1509Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1510 -3:58:28 - BMT 1932 # Bridgetown Mean Time 1511 -4:00 Barb A%sT 1512 1513# Belize 1514# Whitman entirely disagrees with Shanks; go with Shanks. 1515# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1516Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1517Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1518Rule Belize 1973 only - Dec 5 0:00 1:00 D 1519Rule Belize 1974 only - Feb 9 0:00 0 S 1520Rule Belize 1982 only - Dec 18 0:00 1:00 D 1521Rule Belize 1983 only - Feb 12 0:00 0 S 1522# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1523Zone America/Belize -5:52:48 - LMT 1912 Apr 1524 -6:00 Belize C%sT 1525 1526# Bermuda 1527# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1528Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1529 -4:00 - AST 1974 Apr 28 2:00 1530 -4:00 Bahamas A%sT 1531 1532# Cayman Is 1533# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1534Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1535 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1536 -5:00 - EST 1537 1538# Costa Rica 1539# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1540Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1541Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1542Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 1543# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 1544Rule CR 1991 only - Jul 1 0:00 0 S 1545Rule CR 1992 only - Mar 15 0:00 0 S 1546# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1547# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1548Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1549 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 1550 -6:00 CR C%sT 1551# Coco 1552# no information; probably like America/Costa_Rica 1553 1554# Cuba 1555 1556# From Arthur David Olson (1999-03-29): 1557# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 1558# the Cuban National Team and the Baltimore Orioles was carried live on 1559# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 1560# During the game, play-by-play announcer Jim Hunter noted that 1561# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 1562# Time today." (The "two hour" remark referred to losing one hour of 1563# sleep on 1999-03-28--when the announcers were in Cuba as it switched 1564# to DST--and one more hour on 1999-04-04--when the announcers will have 1565# returned to Baltimore, which switches on that date.) 1566 1567# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1568Rule Cuba 1928 only - Jun 10 0:00 1:00 D 1569Rule Cuba 1928 only - Oct 10 0:00 0 S 1570Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 1571Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 1572Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 1573Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 1574Rule Cuba 1965 only - Jun 1 0:00 1:00 D 1575Rule Cuba 1965 only - Sep 30 0:00 0 S 1576Rule Cuba 1966 only - May 29 0:00 1:00 D 1577Rule Cuba 1966 only - Oct 2 0:00 0 S 1578Rule Cuba 1967 only - Apr 8 0:00 1:00 D 1579Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 1580Rule Cuba 1968 only - Apr 14 0:00 1:00 D 1581Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 1582Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 1583Rule Cuba 1972 1974 - Oct 8 0:00 0 S 1584Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 1585Rule Cuba 1978 only - May 7 0:00 1:00 D 1586Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 1587Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 1588Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 1589Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 1590Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 1591Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 1592Rule Cuba 1996 only - Oct 6 0:00s 0 S 1593Rule Cuba 1997 only - Oct 12 0:00s 0 S 1594Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 1595Rule Cuba 1998 max - Oct lastSun 0:00s 0 S 1596Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D 1597 1598# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1599Zone America/Havana -5:29:28 - LMT 1890 1600 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 1601 -5:00 Cuba C%sT 1602 1603# Dominica 1604# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1605Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 1606 -4:00 - AST 1607 1608# Dominican Republic 1609 1610# From Steffen Thorsen (2000-10-30): 1611# Enrique Morales reported to me that the Dominican Republic has changed the 1612# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 1613# http://www.listin.com.do/antes/261000/republica/princi.html 1614 1615# From Paul Eggert (2000-12-04): 1616# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 1617 1618# From Rives McDow (2000-12-01): 1619# Dominican Republic changed its mind and presidential decree on Tuesday, 1620# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 1621# Dominican Republic will be reverting to 8 hours from the International Date 1622# Line, and will not be using DST in the foreseeable future. The reason they 1623# decided to use DST was to be in synch with Puerto Rico, who was also going 1624# to implement DST. When Puerto Rico didn't implement DST, the president 1625# decided to revert. 1626 1627 1628# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1629Rule DR 1966 only - Oct 30 0:00 1:00 D 1630Rule DR 1967 only - Feb 28 0:00 0 S 1631Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 1632Rule DR 1970 only - Feb 21 0:00 0 S 1633Rule DR 1971 only - Jan 20 0:00 0 S 1634Rule DR 1972 1974 - Jan 21 0:00 0 S 1635# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1636Zone America/Santo_Domingo -4:39:36 - LMT 1890 1637 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 1638 -5:00 DR E%sT 1974 Oct 27 1639 -4:00 - AST 2000 Oct 29 02:00 1640 -5:00 US E%sT 2000 Dec 3 01:00 1641 -4:00 - AST 1642 1643# El Salvador 1644# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1645Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 1646Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 1647# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 1648# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1649Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 1650 -6:00 Salv C%sT 1651 1652# Grenada 1653# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1654Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 1655 -4:00 - AST 1656 1657# Guadeloupe 1658# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1659Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 1660 -4:00 - AST 1661 1662# Guatemala 1663# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1664Rule Guat 1973 only - Nov 25 0:00 1:00 D 1665Rule Guat 1974 only - Feb 24 0:00 0 S 1666Rule Guat 1983 only - May 21 0:00 1:00 D 1667Rule Guat 1983 only - Sep 22 0:00 0 S 1668Rule Guat 1991 only - Mar 23 0:00 1:00 D 1669Rule Guat 1991 only - Sep 7 0:00 0 S 1670# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1671Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 1672 -6:00 Guat C%sT 1673 1674# Haiti 1675# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1676Rule Haiti 1983 only - May 8 0:00 1:00 D 1677Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 1678Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 1679# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA. 1680Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 1681Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 1682# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1683Zone America/Port-au-Prince -4:49:20 - LMT 1890 1684 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 1685 -5:00 Haiti E%sT 1686 1687# Honduras 1688# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 1689# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1690Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 1691 -6:00 Salv C%sT 1692# 1693# Great Swan I ceded by US to Honduras in 1972 1694 1695# Jamaica 1696 1697# From Bob Devine (1988-01-28): 1698# Follows US rules. 1699 1700# From U. S. Naval Observatory (1989-01-19): 1701# JAMAICA 5 H BEHIND UTC 1702 1703# From Shanks: 1704# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1705Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 1706 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1707 -5:00 - EST 1974 Apr 28 2:00 1708 -5:00 US E%sT 1984 1709 -5:00 - EST 1710 1711# Martinique 1712# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1713Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 1714 -4:04:20 - FFMT 1911 May # Fort-de-France MT 1715 -4:00 - AST 1980 Apr 6 1716 -4:00 1:00 ADT 1980 Sep 28 1717 -4:00 - AST 1718 1719# Montserrat 1720# From Paul Eggert (1997-08-31): 1721# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 1722# Luckily, Olveston, the current de facto capital, has the same longitude. 1723# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1724Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 1725 -4:00 - AST 1726 1727# Nicaragua 1728# 1729# From Steffen Thorsen (1998-12-29): 1730# Nicaragua seems to be back at -6:00 but I have not been able to find when 1731# they changed from -5:00. 1732# 1733# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1734Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 1735Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 1736Rule Nic 1992 only - Jan 1 4:00 1:00 D 1737Rule Nic 1992 only - Sep 24 0:00 0 S 1738# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1739Zone America/Managua -5:45:08 - LMT 1890 1740 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 1741 -6:00 - CST 1973 May 1742 -5:00 - EST 1975 Feb 16 1743 -6:00 Nic C%sT 1993 Jan 1 4:00 1744 -5:00 - EST 1998 Dec 1745 -6:00 - CST 1746 1747# Panama 1748# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1749Zone America/Panama -5:18:08 - LMT 1890 1750 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time 1751 -5:00 - EST 1752 1753# Puerto Rico 1754# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 1755# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1756Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 1757 -4:00 - AST 1942 May 3 1758 -4:00 1:00 AWT 1945 Sep 30 2:00 1759 -4:00 - AST 1760 1761# St Kitts-Nevis 1762# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1763Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 1764 -4:00 - AST 1765 1766# St Lucia 1767# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1768Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 1769 -4:04:00 - CMT 1912 # Castries Mean Time 1770 -4:00 - AST 1771 1772# St Pierre and Miquelon 1773# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 1774# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1775Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 1776 -4:00 - AST 1980 May 1777 -3:00 Mont PM%sT # Pierre & Miquelon Time 1778 1779# St Vincent and the Grenadines 1780# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1781Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 1782 -4:04:56 - KMT 1912 # Kingstown Mean Time 1783 -4:00 - AST 1784 1785# Turks and Caicos 1786# From Paul Eggert (1998-08-06): 1787# Shanks says they use US DST rules, but IATA SSIM (1991/1998) 1788# says they switch at midnight. Go with IATA SSIM. 1789# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1790Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D 1791Rule TC 1979 max - Oct lastSun 0:00 0 S 1792Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D 1793# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1794Zone America/Grand_Turk -4:44:32 - LMT 1890 1795 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1796 -5:00 TC E%sT 1797 1798# British Virgin Is 1799# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1800Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 1801 -4:00 - AST 1802 1803# Virgin Is 1804# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1805Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 1806 -4:00 - AST 1807