northamerica revision 93799
1# @(#)northamerica 7.61 2# also includes Central America and the Caribbean 3 4# This data is by no means authoritative; if you think you know better, 5# go ahead and edit the file (and please send any changes to 6# tz@elsie.nci.nih.gov for general use in the future). 7 8# From Paul Eggert <eggert@twinsun.com> (1999-03-22): 9# A reliable and entertaining source about time zones is 10# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 11 12############################################################################### 13 14# United States 15 16# From Paul Eggert (1999-03-31): 17# Howse writes (pp 121-125) that time zones were invented by 18# Professor Charles Ferdinand Dowd (1825-1904), 19# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 20# His pamphlet ``A System of National Time for Railroads'' (1870) 21# was the result of his proposals at the Convention of Railroad Trunk Lines 22# in New York City (1869-10). His 1870 proposal was based on Washington, DC, 23# but in 1872-05 he moved the proposed origin to Greenwich. 24# His proposal was adopted by the railroads on 1883-11-18 at 12:00, 25# and the most of the country soon followed suit. 26 27# From Paul Eggert <eggert@twinsun.com> (1995-12-19): 28# A good source for time zone historical data in the US is 29# Thomas G. Shanks, The American Atlas (5th edition), 30# San Diego: ACS Publications, Inc. (1991). 31# Make sure you have the errata sheet; the book is somewhat useless without it. 32# It is the source for the US and Puerto Rico entries below. 33 34# From Paul Eggert (2001-03-06): 35# Daylight Saving Time was first suggested as a joke by Benjamin Franklin 36# in his whimsical essay ``An Economical Project for Diminishing the Cost 37# of Light'' published in the Journal de Paris (1784-04-26). 38# Not everyone is happy with the results: 39# 40# I don't really care how time is reckoned so long as there is some 41# agreement about it, but I object to being told that I am saving 42# daylight when my reason tells me that I am doing nothing of the kind. 43# I even object to the implication that I am wasting something 44# valuable if I stay in bed after the sun has risen. As an admirer 45# of moonlight I resent the bossy insistence of those who want to 46# reduce my time for enjoying it. At the back of the Daylight Saving 47# scheme I detect the bony, blue-fingered hand of Puritanism, eager 48# to push people into bed earlier, and get them up earlier, to make 49# them healthy, wealthy and wise in spite of themselves. 50# 51# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday 52# 53# For more about the first ten years of DST in the United States, see 54# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html"> 55# Ten years of daylight saving from the Pittsburgh standpoint 56# (Carnegie Library of Pittsburgh, 1927)</a>. 57# 58# Shanks says that DST was called "War Time" in the US in 1918 and 1919. 59# However, DST was imposed by the Standard Time Act of 1918, which 60# was the first nationwide legal time standard, and apparently 61# time was just called "Standard Time" or "Daylight Saving Time". 62 63# From Arthur David Olson: 64# US Daylight Saving Time ended on the last Sunday of *October* in 1974. 65# See, for example, the front page of the Saturday, 1974-10-26 66# and Sunday, 1974-10-27 editions of the Washington Post. 67 68# From Arthur David Olson: 69# Before the Uniform Time Act of 1966 took effect in 1967, observance of 70# Daylight Saving Time in the US was by local option, except during wartime. 71 72# From Arthur David Olson (2000-09-25): 73# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 74# In the introduction, Oboler spoke of "Eastern Peace Time." 75# An AltaVista search turned up 76# <a href="http://rowayton.org/rhs/hstaug45.html">: 77# "When the time is announced over the radio now, it is 'Eastern Peace 78# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 79# </a> (August 1945) by way of confirmation. 80 81# From Joseph Gallant <notquite@hotmail.com>, citing 82# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 83# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 84# to switch to London for Attlee's address, but the American people 85# never got to hear his speech live. According to one press account, 86# CBS' Bob Trout was first to announce the word of Japan's surrender, 87# but a few seconds later, NBC, ABC and Mutual also flashed the word 88# of surrender, all of whom interrupting the bells of Big Ben in 89# London which were to precede Mr. Attlee's speech. 90 91# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 92Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 93Rule US 1918 1919 - Oct lastSun 2:00 0 S 94Rule US 1942 only - Feb 9 2:00 1:00 W # War 95Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 96Rule US 1945 only - Sep 30 2:00 0 S 97Rule US 1967 max - Oct lastSun 2:00 0 S 98Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 99Rule US 1974 only - Jan 6 2:00 1:00 D 100Rule US 1975 only - Feb 23 2:00 1:00 D 101Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 102Rule US 1987 max - Apr Sun>=1 2:00 1:00 D 103# <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:"> 104# H.R.177 105# </a> (introduced 1999-01-06) would change April to March in the above rule. 106 107# From Bob Devine (1988-01-28): 108# ...Alaska (and Hawaii) had the timezone names changed in 1967. 109# old new 110# Pacific Standard Time(PST) -same- 111# Yukon Standard Time(YST) -same- 112# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST) 113# Nome Standard Time (NT) Bering Standard Time (BST) 114# 115# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz. 116# The YST zone now covers nearly all of the state, AHST just part 117# of the Aleutian islands. No DST. 118 119# From Paul Eggert (1995-12-19): 120# The tables below use `NST', not `NT', for Nome Standard Time. 121# I invented `CAWT' for Central Alaska War Time. 122 123# From U. S. Naval Observatory (1989-01-19): 124# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 125# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 126# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 127# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 128# USA MOUNTAIN 7 H BEHIND UTC DENVER 129# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 130# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 131# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 132# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 133# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 134# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 135# USA - " - 9 H BEHIND UTC APR 3 - OCT 30 136# USA HAWAII 10 H BEHIND UTC 137# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 138 139# From Arthur David Olson (1989-01-21): 140# The above dates are for 1988. 141# Note the "AKST" and "AKDT" abbreviations, the claim that there's 142# no DST in Samoa, and the claim that there is DST in Alaska and the 143# Aleutians. 144 145# From Arthur David Olson (1988-02-13): 146# Legal standard time zone names, from United States Code (1982 Edition and 147# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 148# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 149# took effect), as explained in sections 263 and 261: 150# (none) 151# United States standard eastern time 152# United States standard mountain time 153# United States standard central time 154# United States standard Pacific time 155# (none) 156# United States standard Alaska time 157# (none) 158# Next, names from 1967-04-01 until 1983-11-30 (the date for 159# public law 98-181): 160# Atlantic standard time 161# eastern standard time 162# central standard time 163# mountain standard time 164# Pacific standard time 165# Yukon standard time 166# Alaska-Hawaii standard time 167# Bering standard time 168# And after 1983-11-30: 169# Atlantic standard time 170# eastern standard time 171# central standard time 172# mountain standard time 173# Pacific standard time 174# Alaska standard time 175# Hawaii-Aleutian standard time 176# Samoa standard time 177# The law doesn't give abbreviations. 178# 179# From Paul Eggert (1995-12-19): 180# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions. 181# Go with Shanks. 182# 183# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 184# Public law 106-564 (2000-12-23) introduced the abbreviation 185# "Chamorro Standard Time" for time in Guam and the Northern Marianas. 186# See the file "australasia". 187 188 189# US eastern time, represented by New York 190 191# Connecticut, Delaware, District of Columbia, most of Florida, 192# Georgia, far southeastern Indiana, eastern Kentucky, Maine, 193# Maryland, Massachusetts, New Hampshire, New Jersey, New York, North 194# Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, eastern 195# Tennessee, Vermont, Virginia, West Virginia 196 197# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 198Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 199Rule NYC 1920 only - Oct lastSun 2:00 0 S 200Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 201Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 202Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 203# Zone NAME GMTOFF RULES FORMAT [UNTIL] 204Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00 205 -5:00 US E%sT 1920 206 -5:00 NYC E%sT 1942 207 -5:00 US E%sT 1946 208 -5:00 NYC E%sT 1967 209 -5:00 US E%sT 210 211# US central time, represented by Chicago 212 213# Alabama, Arkansas, Florida panhandle, Illinois, western Indiana 214# corners, Iowa, most of Kansas, western Kentucky, Louisiana, 215# Minnesota, Mississippi, Missouri, eastern Nebraska, eastern North 216# Dakota, Oklahoma, eastern South Dakota, western Tennessee, most of 217# Texas, Wisconsin 218 219# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 220Rule Chicago 1920 only - Jun 13 2:00 1:00 D 221Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 222Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 223Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 224Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 225Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 226# Zone NAME GMTOFF RULES FORMAT [UNTIL] 227Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00 228 -6:00 US C%sT 1920 229 -6:00 Chicago C%sT 1936 Mar 1 2:00 230 -5:00 - EST 1936 Nov 15 2:00 231 -6:00 Chicago C%sT 1942 232 -6:00 US C%sT 1946 233 -6:00 Chicago C%sT 1967 234 -6:00 US C%sT 235# Oliver County, ND switched from mountain to central time on 1992-10-25. 236Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:00 237 -7:00 US M%sT 1992 Oct 25 02:00 238 -6:00 US C%sT 239 240# US mountain time, represented by Denver 241# 242# Colorado, southern Idaho, far western Kansas, Montana, western 243# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 244# New Mexico, southwestern North Dakota, far eastern Oregon, 245# western South Dakota, far western Texas (El Paso County, Hudspeth County, 246# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 247# 248# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 249Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 250Rule Denver 1920 only - Oct lastSun 2:00 0 S 251Rule Denver 1921 only - May 22 2:00 0 S 252Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 253Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 254# Zone NAME GMTOFF RULES FORMAT [UNTIL] 255Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00 256 -7:00 US M%sT 1920 257 -7:00 Denver M%sT 1942 258 -7:00 US M%sT 1946 259 -7:00 Denver M%sT 1967 260 -7:00 US M%sT 261 262# US Pacific time, represented by Los Angeles 263# 264# California, northern Idaho, most of Nevada, most of Oregon, and Washington 265# 266# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 267Rule CA 1948 only - Mar 14 2:00 1:00 D 268Rule CA 1949 only - Jan 1 2:00 0 S 269Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D 270Rule CA 1950 1961 - Sep lastSun 2:00 0 S 271Rule CA 1962 1966 - Oct lastSun 2:00 0 S 272# Zone NAME GMTOFF RULES FORMAT [UNTIL] 273Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00 274 -8:00 US P%sT 1946 275 -8:00 CA P%sT 1967 276 -8:00 US P%sT 277 278# Alaska 279# AK%sT is the modern abbreviation for -9:00 per USNO. 280# 281# From Paul Eggert (2001-05-30): 282# Howse writes that Alaska switched from the Julian to the Gregorian calendar, 283# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 284# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian, 285# also a Friday. Include only the time zone part of this transition, 286# ignoring the switch from Julian to Gregorian, since we can't represent 287# the Julian calendar. 288# 289# As far as we know, none of the exact locations mentioned below were 290# permanently inhabited in 1867 by anyone using either calendar. 291# (Yakutat was colonized by the Russians in 1799, but the settlement 292# was destroyed in 1805 by a Yakutat-kon war party.) However, there 293# were nearby inhabitants in some cases and for our purposes perhaps 294# it's best to simply use the official transition. 295# 296# Zone NAME GMTOFF RULES FORMAT [UNTIL] 297Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 298 -8:57:41 - LMT 1900 Aug 20 12:00 299 -8:00 - PST 1942 300 -8:00 US P%sT 1946 301 -8:00 - PST 1969 302 -8:00 US P%sT 1983 Oct 30 2:00 303 -9:00 US AK%sT 304Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 305 -9:18:55 - LMT 1900 Aug 20 12:00 306 -9:00 - YST 1942 307 -9:00 US Y%sT 1946 308 -9:00 - YST 1969 309 -9:00 US Y%sT 1983 Oct 30 2:00 310 -9:00 US AK%sT 311Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 312 -9:59:36 - LMT 1900 Aug 20 12:00 313 -10:00 - CAT 1942 314 -10:00 US CAT/CAWT 1946 315 -10:00 - CAT 1967 Apr 316 -10:00 - AHST 1969 317 -10:00 US AH%sT 1983 Oct 30 2:00 318 -9:00 US AK%sT 319Zone America/Nome 12:58:21 - LMT 1867 Oct 18 320 -11:01:38 - LMT 1900 Aug 20 12:00 321 -11:00 - NST 1942 322 -11:00 US N%sT 1946 323 -11:00 - NST 1967 Apr 324 -11:00 - BST 1969 325 -11:00 US B%sT 1983 Oct 30 2:00 326 -9:00 US AK%sT 327Zone America/Adak 12:13:21 - LMT 1867 Oct 18 328 -11:46:38 - LMT 1900 Aug 20 12:00 329 -11:00 - NST 1942 330 -11:00 US N%sT 1946 331 -11:00 - NST 1967 Apr 332 -11:00 - BST 1969 333 -11:00 US B%sT 1983 Oct 30 2:00 334 -10:00 US HA%sT 335# Shanks writes that part of southwest Alaska (e.g. Aniak) 336# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 337# and another part (e.g. Akiak) made the same switch five weeks later. 338# These switches don't quite make our 1970 cutoff. 339 340# Hawaii 341# 342# From Arthur David Olson: 343# And then there's Hawaii. 344# DST was observed for one day in 1933; 345# standard time was changed by half an hour in 1947; 346# it's always standard as of 1986. 347# 348# From Paul Eggert: 349# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks. 350# 351Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 352 -10:30 - HST 1933 Apr 30 2:00 353 -10:30 1:00 HDT 1933 May 21 2:00 354 -10:30 US H%sT 1947 Jun 8 2:00 355 -10:00 - HST 356 357# Now we turn to US areas that have diverged from the consensus since 1970. 358 359# Arizona mostly uses MST. 360Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00 361 -7:00 US M%sT 1944 Jan 1 00:01 362 -7:00 - MST 1944 Mar 17 00:01 363 -7:00 US M%sT 1944 Oct 1 00:01 364 -7:00 - MST 1967 365 -7:00 US M%sT 1968 366 -7:00 - MST 367# From Arthur David Olson (1988-02-13): 368# A writer from the Inter Tribal Council of Arizona, Inc., 369# notes in private correspondence dated 12/28/87 that "Presently, only the 370# Navajo Nation participates in the Daylight Saving Time policy, due to its 371# large size and location in three states." (The "only" means that other 372# tribal nations don't use DST.) 373 374Link America/Denver America/Shiprock 375 376# Southern Idaho and eastern Oregon switched four weeks late in 1974. 377# Zone NAME GMTOFF RULES FORMAT [UNTIL] 378Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00 379 -8:00 US P%sT 1923 May 13 2:00 380 -7:00 US M%sT 1974 381 -7:00 - MST 1974 Feb 3 2:00 382 -7:00 US M%sT 383 384# Indiana 385# 386# For a map of Indiana's time zone regions, see: 387# <a href="http://www.mccsc.edu/time.html"> 388# What time is it in Indiana? 389# </a> (1999-04-06) 390# 391# From Paul Eggert (1995-12-19): 392# Indiana generally observes either EST all year, or CST/CDT, 393# but areas near Cincinnati and Louisville use those cities' timekeeping 394# and in 1969 and 1970 the whole state observed daylight time; 395# and there are other exceptions as noted below. 396# Shanks partitions Indiana into 345 regions, each with its own time history, 397# and writes ``Even newspaper reports present contradictory information.'' 398# Fortunately, most of the complexity occurred before our cutoff date of 1970. 399# 400# Since 1970, EST-only Indiana has been like America/Indianapolis, 401# with exceptions noted below for Crawford, Starke, and Switzerland counties. 402# The parts of Indiana not listed below have been like America/Chicago, 403# America/Louisville, or America/New_York. 404# 405# Other than Indianapolis, the Indiana place names are so nondescript 406# that they would be ambiguous if we left them at the `America' level. 407# So we reluctantly put them all in a subdirectory `America/Indiana'. 408# 409# Most of EST-only Indiana last observed DST in 1970. 410 411# From Paul Eggert (2001-03-06), following a tip by Markus Kuhn: 412# Pam Belluck reported in the New York Times (2001-01-31) that the 413# Indiana Legislature is considering a bill to adopt DST statewide. 414# Her article mentioned Vevay, whose post office observes a different 415# time zone from Danner's Hardware across the street. 416 417# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 418Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 419Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 420Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 421# Zone NAME GMTOFF RULES FORMAT [UNTIL] 422Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00 423 -6:00 US C%sT 1920 424 -6:00 Indianapolis C%sT 1942 425 -6:00 US C%sT 1946 426 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 427 -5:00 - EST 1957 Sep 29 2:00 428 -6:00 - CST 1958 Apr 27 2:00 429 -5:00 - EST 1969 430 -5:00 US E%sT 1971 431 -5:00 - EST 432Link America/Indianapolis America/Indiana/Indianapolis 433# 434# Part of Crawford County, Indiana, last observed DST in 1975, 435# and left its clocks alone in 1974. 436# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 437Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 438Rule Marengo 1951 only - Sep lastSun 2:00 0 S 439Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 440Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 441# Zone NAME GMTOFF RULES FORMAT [UNTIL] 442Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00 443 -6:00 US C%sT 1951 444 -6:00 Marengo C%sT 1961 Apr 30 2:00 445 -5:00 - EST 1969 446 -5:00 US E%sT 1974 Jan 6 2:00 447 -6:00 1:00 CDT 1974 Oct 27 2:00 448 -5:00 US E%sT 1976 449 -5:00 - EST 450# 451# Starke County, Indiana 452# From Arthur David Olson (1991-10-28): 453# An article on page A3 of the Sunday, 1991-10-27 Washington Post 454# notes that Starke County switched from Central time to Eastern time as of 455# 1991-10-27. 456# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 457Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 458Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 459Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 460Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 461Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 462# Zone NAME GMTOFF RULES FORMAT [UNTIL] 463Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00 464 -6:00 US C%sT 1947 465 -6:00 Starke C%sT 1962 Apr 29 2:00 466 -5:00 - EST 1963 Oct 27 2:00 467 -6:00 US C%sT 1991 Oct 27 2:00 468 -5:00 - EST 469# 470# Switzerland County, Indiana, last observed DST in 1972. 471# Zone NAME GMTOFF RULES FORMAT [UNTIL] 472Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00 473 -6:00 US C%sT 1954 Apr 25 2:00 474 -5:00 - EST 1969 475 -5:00 US E%sT 1973 476 -5:00 - EST 477 478# Part of Kentucky left its clocks alone in 1974. 479# This also includes a part of Indiana immediately adjacent to Louisville. 480# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 481Rule Louisville 1921 only - May 1 2:00 1:00 D 482Rule Louisville 1921 only - Sep 1 2:00 0 S 483Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 484Rule Louisville 1941 only - Sep lastSun 2:00 0 S 485Rule Louisville 1946 only - Jun 2 2:00 0 S 486Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 487Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 488# Zone NAME GMTOFF RULES FORMAT [UNTIL] 489Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00 490 -6:00 US C%sT 1921 491 -6:00 Louisville C%sT 1942 492 -6:00 US C%sT 1946 493 -6:00 Louisville C%sT 1961 Jul 23 2:00 494 -5:00 - EST 1968 495 -5:00 US E%sT 1974 Jan 6 2:00 496 -6:00 1:00 CDT 1974 Oct 27 2:00 497 -5:00 US E%sT 498Link America/Louisville America/Kentucky/Louisville 499# 500# Wayne, Clinton, and Russell Counties, Kentucky 501# 502# From 503# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"> 504# Lake Cumberland LIFE 505# </a> (1999-01-29) via WKYM-101.7: 506# Clinton County has joined Wayne County in asking the DoT to change from 507# the Central to the Eastern time zone.... The Wayne County government made 508# the same request in December. And while Russell County officials have not 509# taken action, the majority of respondents to a poll conducted there in 510# August indicated they would like to change to "fast time" also. 511# The three Lake Cumberland counties are the farthest east of any U.S. 512# location in the Central time zone. 513# 514# From Rich Wales (2000-08-29): 515# After prolonged debate, and despite continuing deep differences of opinion, 516# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 517# (-0500) time. They won't "fall back" this year. See Sara Shipley, 518# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 519# 520# From Paul Eggert (2001-07-16): 521# The final rule was published in the 522# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22"> 523# Federal Register 65, 160 (2000-08-17), page 50154-50158. 524# </a> 525# 526Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:00 527 -6:00 US C%sT 1946 528 -6:00 - CST 1968 529 -6:00 US C%sT 2000 Oct 29 2:00 530 -5:00 US E%sT 531 532 533# From Rives McDow (2000-08-30): 534# Here ... are all the changes in the US since 1985. 535# Kearny County, KS (put all of county on central; 536# previously split between MST and CST) ... 1990-10 537# Starke County, IN (from CST to EST) ... 1991-10 538# Oliver County, ND (from MST to CST) ... 1992-10 539# West Wendover, NV (from PST TO MST) ... 1999-10 540# Wayne County, KY (from CST to EST) ... 2000-10 541# 542# From Paul Eggert (2001-07-17): 543# We don't know where the line used to be within Kearny County, KS, 544# so omit that change for now. 545# See America/Indiana/Knox for the Starke County, IN change. 546# See America/North_Dakota/Center for the Oliver County, ND change. 547# West Wendover, NV officially switched from Pacific to mountain time on 548# 1999-10-31. See the 549# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15"> 550# Federal Register 64, 203 (1999-10-21), page 56705-56707. 551# </a> 552# However, the Federal Register says that West Wendover already operated 553# on mountain time, and the rule merely made this official; 554# hence a separate tz entry is not needed. 555 556# Michigan 557# 558# From Bob Devine (1988-01-28): 559# Michigan didn't observe DST from 1968 to 1973. 560# 561# From Paul Eggert (1999-03-31): 562# Shanks writes that Michigan started using standard time on 1885-09-18, 563# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 564# that Detroit kept 565# 566# local time until 1900 when the City Council decreed that clocks should 567# be put back twenty-eight minutes to Central Standard Time. Half the 568# city obeyed, half refused. After considerable debate, the decision 569# was rescinded and the city reverted to Sun time. A derisive offer to 570# erect a sundial in front of the city hall was referred to the 571# Committee on Sewers. Then, in 1905, Central time was adopted 572# by city vote. 573# 574# This story is too entertaining to be false, so go with Howse over Shanks. 575# 576# From Paul Eggert (2001-03-06): 577# Garland (1927) writes ``Cleveland and Detroit advanced their clocks 578# one hour in 1914.'' This change is not in Shanks. We have no more 579# info, so omit this for now. 580# 581# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 582# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 583Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 584Rule Detroit 1948 only - Sep lastSun 2:00 0 S 585Rule Detroit 1967 only - Jun 14 2:00 1:00 D 586Rule Detroit 1967 only - Oct lastSun 2:00 0 S 587# Zone NAME GMTOFF RULES FORMAT [UNTIL] 588Zone America/Detroit -5:32:11 - LMT 1905 589 -6:00 - CST 1915 May 15 2:00 590 -5:00 - EST 1942 591 -5:00 US E%sT 1946 592 -5:00 Detroit E%sT 1973 593 -5:00 US E%sT 1975 594 -5:00 - EST 1975 Apr 27 2:00 595 -5:00 US E%sT 596# 597# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973. 598# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 599Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 600Rule Menominee 1946 only - Sep lastSun 2:00 0 S 601Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 602Rule Menominee 1966 only - Oct lastSun 2:00 0 S 603# Zone NAME GMTOFF RULES FORMAT [UNTIL] 604Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 605 -6:00 US C%sT 1946 606 -6:00 Menominee C%sT 1969 Apr 27 2:00 607 -5:00 - EST 1973 Apr 29 2:00 608 -6:00 US C%sT 609 610# Navassa 611# administered by the US Fish and Wildlife Service 612# claimed by US under the provisions of the 1856 Guano Islands Act 613# also claimed by Haiti 614# occupied 1857/1900 by the Navassa Phosphate Co 615# US lighthouse 1917/1996-09 616# currently uninhabited 617# see Mark Fineman, ``An Isle Rich in Guano and Discord'', 618# _Los Angeles Times_ (1998-11-10), A1, A10; it cites 619# Jimmy Skaggs, _The Great Guano Rush_ (1994). 620 621# Old names, for S5 users 622 623# Link LINK-FROM LINK-TO 624Link America/New_York EST5EDT 625Link America/Chicago CST6CDT 626Link America/Denver MST7MDT 627Link America/Los_Angeles PST8PDT 628Link America/Indianapolis EST 629Link America/Phoenix MST 630Link Pacific/Honolulu HST 631 632################################################################################ 633 634 635# From Paul Eggert <eggert@twinsun.com> (1999-10-29): 636# A good source for time zone historical data outside the US is 637# Thomas G. Shanks, The International Atlas (5th edition), 638# San Diego: ACS Publications, Inc. (1999). 639# 640# Gwillim Law writes that a good source 641# for recent time zone data is the International Air Transport 642# Association's Standard Schedules Information Manual (IATA SSIM), 643# published semiannually. Law sent in several helpful summaries 644# of the IATA's data after 1990. 645# 646# Except where otherwise noted, Shanks is the source for entries through 1990, 647# and IATA SSIM is the source for entries after 1990. 648# 649# Another source occasionally used is Edward W. Whitman, World Time Differences, 650# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which 651# I found in the UCLA library. 652# 653# See the `europe' file for Greenland. 654 655# Canada 656 657# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14): 658# I post here the time zone abbreviations standardized in Canada 659# for both English and French in the CAN/CSA-Z234.4-89 standard.... 660# 661# UTC Standard time Daylight savings time 662# offset French English French English 663# -2:30 - - HAT NDT 664# -3 - - HAA ADT 665# -3:30 HNT NST - - 666# -4 HNA AST HAE EDT 667# -5 HNE EST HAC CDT 668# -6 HNC CST HAR MDT 669# -7 HNR MST HAP PDT 670# -8 HNP PST HAY YDT 671# -9 HNY YST - - 672# 673# HN: Heure Normale ST: Standard Time 674# HA: Heure Avanc<e'>e DT: Daylight saving Time 675# 676# A: de l'Atlantique Atlantic 677# C: du Centre Central 678# E: de l'Est Eastern 679# M: Mountain 680# N: Newfoundland 681# P: du Pacifique Pacific 682# R: des Rocheuses 683# T: de Terre-Neuve 684# Y: du Yukon Yukon 685# 686# From Paul Eggert <eggert@twinsun.com> (1994-11-22): 687# Alas, this sort of thing must be handled by localization software. 688 689# Unless otherwise specified, the data for Canada are all from Shanks. 690 691# From Paul Eggert (2000-10-02): 692# H. David Matthews and Mary Vincent's map 693# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm"> 694# "It's about TIME", _Canadian Geographic_ (September-October 1998) 695# </a> contains detailed boundaries for regions observing nonstandard 696# time and daylight saving time arrangements in Canada circa 1998. 697# 698# INMS, the Institute for National Measurement Standards in Ottawa, has 699# <a href="http://www.nrc.ca/inms/time/tze.html"> 700# information about standard and daylight saving time zones in Canada. 701# </a> (updated periodically). 702# Its unofficial information is often taken from Matthews and Vincent. 703 704# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 705Rule Canada 1918 only - Apr 14 2:00 1:00 D 706Rule Canada 1918 only - Oct 31 2:00 0 S 707Rule Canada 1942 only - Feb 9 2:00 1:00 W 708Rule Canada 1945 only - Sep 30 2:00 0 S 709Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 710Rule Canada 1974 max - Oct lastSun 2:00 0 S 711Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D 712 713 714# Newfoundland (and far southeast Labrador) 715 716# From Paul Eggert (2000-10-02): 717# Matthews and Vincent (1998) write that Labrador should use NST/NDT, 718# but the only part of Labrador that follows the rules is the 719# southeast corner, including Port Hope Simpson and Mary's Harbour, 720# but excluding, say, Black Tickle. 721 722# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 723Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D 724Rule StJohns 1917 only - Sep 17 2:00 0 S 725Rule StJohns 1918 only - Oct 31 2:00 0 S 726# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks. 727Rule StJohns 1919 only - May 5 23:00 1:00 D 728Rule StJohns 1919 only - Aug 12 23:00 0 S 729# For 1931-1935 Whitman gives Apr same date; go with Shanks. 730Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 731Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 732# For 1936-1941 Shanks gives May Mon>=9 and Oct Mon>=2; go with Whitman. 733Rule StJohns 1936 1941 - May Sun>=8 0:00 1:00 D 734Rule StJohns 1936 1941 - Oct Sun>=1 0:00 0 S 735# Shanks gives 1942 May 11 - 1945 Sep 30; go with Whitman. 736Rule StJohns 1942 only - Mar 1 0:00 1:00 W 737Rule StJohns 1942 only - Dec 31 0:00 0 S 738Rule StJohns 1943 only - May 30 0:00 1:00 W 739Rule StJohns 1943 only - Sep 5 0:00 0 S 740Rule StJohns 1944 only - Jul 10 0:00 1:00 W 741Rule StJohns 1944 only - Sep 2 0:00 0 S 742Rule StJohns 1945 only - Jan 1 0:00 1:00 W 743Rule StJohns 1945 only - Oct 7 2:00 0 S 744# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 745# Apr 30 - Sep 24; go with Shanks. 746Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 747Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 748Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 749Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 750Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 751# From Paul Eggert (2000-10-02): 752# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 753# at 00:01 local time. For now, assume it started in 1987. 754Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 755Rule StJohns 1987 max - Oct lastSun 0:01 0 S 756Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 757Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D 758# St John's has an apostrophe, but Posix file names can't have apostrophes. 759# Zone NAME GMTOFF RULES FORMAT [UNTIL] 760Zone America/St_Johns -3:30:52 - LMT 1884 761 -3:30:52 StJohns N%sT 1935 Mar 30 762 -3:30 StJohns N%sT 763 764 765# most of east Labrador 766 767# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'. 768# Zone NAME GMTOFF RULES FORMAT [UNTIL] 769Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 770 -3:30:52 StJohns NST 1919 771 -3:30:52 - NST 1935 Mar 30 772 -3:30 - NST 1936 773 -3:30 StJohns N%sT 1966 Mar 15 2:00 774 -4:00 StJohns A%sT 775 776 777# west Labrador, New Brunswick, Nova Scotia, Prince Edward I 778 779# From Paul Eggert (1996-06-12): 780# Shanks writes that since 1970 most of this region has been like Halifax. 781# Many locales did not observe peacetime DST until 1972; 782# Glace Bay, NS is the largest that we know of. 783# Shanks also writes that Liverpool, NS was the only town in Canada to observe 784# DST in 1971 but not 1970; for now we'll assume this is a typo. 785 786# From Paul Eggert (2000-10-02): 787# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches 788# at 00:01 local time. FIXME: verify and create a new Zone for this. 789 790 791# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 792Rule Halifax 1916 only - Apr 1 0:00 1:00 D 793Rule Halifax 1916 only - Oct 1 0:00 0 S 794Rule Halifax 1918 only - Apr 14 2:00 1:00 D 795Rule Halifax 1918 only - Oct 31 2:00 0 S 796Rule Halifax 1920 only - May 9 0:00 1:00 D 797Rule Halifax 1920 only - Aug 29 0:00 0 S 798Rule Halifax 1921 only - May 6 0:00 1:00 D 799Rule Halifax 1921 1922 - Sep 5 0:00 0 S 800Rule Halifax 1922 only - Apr 30 0:00 1:00 D 801Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 802Rule Halifax 1923 only - Sep 4 0:00 0 S 803Rule Halifax 1924 only - Sep 15 0:00 0 S 804Rule Halifax 1925 only - Sep 28 0:00 0 S 805Rule Halifax 1926 only - May 16 0:00 1:00 D 806Rule Halifax 1926 only - Sep 13 0:00 0 S 807Rule Halifax 1927 only - May 1 0:00 1:00 D 808Rule Halifax 1927 only - Sep 26 0:00 0 S 809Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 810Rule Halifax 1928 only - Sep 9 0:00 0 S 811Rule Halifax 1929 only - Sep 3 0:00 0 S 812Rule Halifax 1930 only - Sep 15 0:00 0 S 813Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 814Rule Halifax 1933 only - Apr 30 0:00 1:00 D 815Rule Halifax 1933 only - Oct 2 0:00 0 S 816Rule Halifax 1934 only - May 20 0:00 1:00 D 817Rule Halifax 1934 only - Sep 16 0:00 0 S 818Rule Halifax 1935 only - Jun 2 0:00 1:00 D 819Rule Halifax 1935 only - Sep 30 0:00 0 S 820Rule Halifax 1936 only - Jun 1 0:00 1:00 D 821Rule Halifax 1936 only - Sep 14 0:00 0 S 822Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 823Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 824Rule Halifax 1939 only - May 28 0:00 1:00 D 825Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 826Rule Halifax 1942 only - Feb 9 2:00 1:00 W 827Rule Halifax 1945 1959 - Sep lastSun 2:00 0 S 828Rule Halifax 1946 1959 - Apr lastSun 2:00 1:00 D 829Rule Halifax 1962 1986 - Apr lastSun 2:00 1:00 D 830Rule Halifax 1962 max - Oct lastSun 2:00 0 S 831Rule Halifax 1987 max - Apr Sun>=1 2:00 1:00 D 832# Zone NAME GMTOFF RULES FORMAT [UNTIL] 833Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 834 -4:00 Halifax A%sT 835Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 836 -4:00 Canada A%sT 1953 837 -4:00 Halifax A%sT 1954 838 -4:00 - AST 1972 839 -4:00 Halifax A%sT 840 841 842# Ontario, Quebec 843 844# From Paul Eggert (1996-06-12): 845# Shanks writes that since 1970 most of this region has been like Montreal. 846# Thunder Bay skipped DST in 1973. 847# Many smaller locales did not observe peacetime DST until 1974; 848# Nipigon (EST) and Rainy River (CST) are the largest that we know of. 849# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 850 851# From Paul Eggert (1997-10-17): 852# msb@sq.com writes that an article in the 1997-10-14 Toronto Star 853# says that Atikokan, Ontario currently does not observe DST, 854# but will vote on 11-10 whether to use EST/EDT. 855# He also writes that the 856# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html"> 857# Ontario Time Act (1990, Chapter T.9) 858# </a> 859# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 860# Officially Atikokan is therefore on CST/CDT, and most likely this report 861# concerns a non-official time observed as a matter of local practice. 862# For what it's worth, Shanks says that Atikokan has agreed with 863# Rainy River ever since standard time was introduced. 864 865# From Paul Eggert (2000-10-02): 866# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 867# New Osnaburgh observe CST all year, that Big Trout Lake observes 868# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 869# violation of the official Ontario rules. 870# They also write that Quebec east of the -63 meridian is supposed to 871# observe AST, but residents as far east as Natashquan use EST/EDT, 872# and residents east of Natashquan use AST. 873# We probably need Zones for far east Quebec and for Atikokan, 874# but we don't know when their practices started. 875 876# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 877Rule Mont 1917 only - Mar 25 2:00 1:00 D 878Rule Mont 1917 only - Apr 24 0:00 0 S 879Rule Mont 1918 only - Apr 14 2:00 1:00 D 880Rule Mont 1918 only - Oct 31 2:00 0 S 881Rule Mont 1919 only - Mar 31 2:30 1:00 D 882Rule Mont 1919 only - Oct 25 2:30 0 S 883Rule Mont 1920 only - May 2 2:30 1:00 D 884Rule Mont 1920 only - Oct 3 2:30 0 S 885Rule Mont 1921 only - May 1 2:00 1:00 D 886Rule Mont 1921 only - Oct 2 2:30 0 S 887Rule Mont 1922 only - Apr 30 2:00 1:00 D 888Rule Mont 1922 only - Oct 1 2:30 0 S 889Rule Mont 1924 only - May 17 2:00 1:00 D 890Rule Mont 1924 1926 - Sep lastSun 2:30 0 S 891Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D 892Rule Mont 1927 only - May 1 0:00 1:00 D 893Rule Mont 1927 1932 - Sep Sun>=25 0:00 0 S 894Rule Mont 1928 1931 - Apr Sun>=25 0:00 1:00 D 895Rule Mont 1932 only - May 1 0:00 1:00 D 896Rule Mont 1933 1940 - Apr Sun>=24 0:00 1:00 D 897Rule Mont 1933 only - Oct 1 0:00 0 S 898Rule Mont 1934 1939 - Sep Sun>=24 0:00 0 S 899Rule Mont 1945 1948 - Sep lastSun 2:00 0 S 900Rule Mont 1946 1986 - Apr lastSun 2:00 1:00 D 901Rule Mont 1949 1950 - Oct lastSun 2:00 0 S 902Rule Mont 1951 1956 - Sep lastSun 2:00 0 S 903Rule Mont 1957 max - Oct lastSun 2:00 0 S 904Rule Mont 1987 max - Apr Sun>=1 2:00 1:00 D 905# Zone NAME GMTOFF RULES FORMAT [UNTIL] 906Zone America/Montreal -4:54:16 - LMT 1884 907 -5:00 Mont E%sT 908Zone America/Thunder_Bay -5:57:00 - LMT 1895 909 -5:00 Canada E%sT 1970 910 -5:00 Mont E%sT 1973 911 -5:00 - EST 1974 912 -5:00 Canada E%sT 913Zone America/Nipigon -5:53:04 - LMT 1895 914 -5:00 Canada E%sT 915Zone America/Rainy_River -6:17:56 - LMT 1895 916 -6:00 Canada C%sT 917 918 919# Manitoba 920 921# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 922Rule Winn 1916 only - Apr 23 0:00 1:00 D 923Rule Winn 1916 only - Sep 17 0:00 0 S 924Rule Winn 1918 only - Apr 14 2:00 1:00 D 925Rule Winn 1918 only - Oct 31 2:00 0 S 926Rule Winn 1937 only - May 16 2:00 1:00 D 927Rule Winn 1937 only - Sep 26 2:00 0 S 928Rule Winn 1942 only - Feb 9 2:00 1:00 W 929Rule Winn 1945 only - Sep lastSun 2:00 0 S 930Rule Winn 1946 only - May 12 2:00 1:00 D 931Rule Winn 1946 only - Oct 13 2:00 0 S 932Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 933Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 934Rule Winn 1950 only - May 1 2:00 1:00 D 935Rule Winn 1950 only - Sep 30 2:00 0 S 936Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 937Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 938Rule Winn 1959 only - Oct lastSun 2:00 0 S 939Rule Winn 1960 only - Sep lastSun 2:00 0 S 940Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 941Rule Winn 1963 only - Sep 22 2:00 0 S 942Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D 943Rule Winn 1966 1986 - Oct lastSun 2:00 0 S 944Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D 945# From Paul Eggert (2000-10-02): 946# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from 947# DST at 03:00 local time. For now, assume it started in 1987. 948Rule Winn 1987 max - Oct lastSun 2:00s 0 S 949# Zone NAME GMTOFF RULES FORMAT [UNTIL] 950Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 951 -6:00 Winn C%sT 952 953 954# Saskatchewan 955 956# From Paul Eggert (2000-10-02): 957# Shanks writes that since 1970 most of this region has been like Regina. 958# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 959# Other western towns (e.g. Lloydminster) are like Edmonton. 960# Matthews and Vincent (1998) write that Denare Beach and Creighton 961# are like Winnipeg, in violation of Saskatchewan law. 962 963# From W. Jones <jones@skdad.usask.ca> (1992-11-06): 964# The. . .below is based on information I got from our law library, the 965# provincial archives, and the provincial Community Services department. 966# A precise history would require digging through newspaper archives, and 967# since you didn't say what you wanted, I didn't bother. 968# 969# Saskatchewan is split by a time zone meridian (105W) and over the years 970# the boundary became pretty ragged as communities near it reevaluated 971# their affiliations in one direction or the other. In 1965 a provincial 972# referendum favoured legislating common time practices. 973# 974# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 975# Saskatchewan 1978) was proclaimed, and established that the eastern 976# part of Saskatchewan would use CST year round, that districts in 977# northwest Saskatchewan would by default follow CST but could opt to 978# follow Mountain Time rules (thus 1 hour difference in the winter and 979# zero in the summer), and that districts in southwest Saskatchewan would 980# by default follow MT but could opt to follow CST. 981# 982# It took a few years for the dust to settle (I know one story of a town 983# on one time zone having its school in another, such that a mom had to 984# serve her family lunch in two shifts), but presently it seems that only 985# a few towns on the border with Alberta (e.g. Lloydminster) follow MT 986# rules any more; all other districts appear to have used CST year round 987# since sometime in the 1960s. 988 989# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 990Rule Regina 1918 only - Apr 14 2:00 1:00 D 991Rule Regina 1918 only - Oct 31 2:00 0 S 992Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 993Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 994Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 995Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 996Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 997Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 998Rule Regina 1942 only - Feb 9 2:00 1:00 W 999Rule Regina 1945 only - Sep lastSun 2:00 0 S 1000Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1001Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1002Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D 1003Rule Regina 1947 1958 - Sep lastSun 2:00 0 S 1004Rule Regina 1959 only - Oct lastSun 2:00 0 S 1005# 1006Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1007Rule Swift 1957 only - Oct lastSun 2:00 0 S 1008Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1009Rule Swift 1959 only - Oct lastSun 2:00 0 S 1010Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1011# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1012Zone America/Regina -6:58:36 - LMT 1905 Sep 1013 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1014 -6:00 - CST 1015Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1016 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1017 -7:00 Regina M%sT 1950 1018 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1019 -6:00 - CST 1020 1021 1022# Alberta 1023 1024# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1025Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1026Rule Edm 1918 only - Oct 31 2:00 0 S 1027Rule Edm 1919 only - May 27 2:00 0 S 1028Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1029Rule Edm 1920 only - Oct lastSun 2:00 0 S 1030Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1031Rule Edm 1942 only - Feb 9 2:00 1:00 W 1032Rule Edm 1945 only - Sep lastSun 2:00 0 S 1033Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1034Rule Edm 1947 only - Sep lastSun 2:00 0 S 1035Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1036Rule Edm 1967 only - Oct lastSun 2:00 0 S 1037Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1038Rule Edm 1969 only - Oct lastSun 2:00 0 S 1039Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1040Rule Edm 1972 max - Oct lastSun 2:00 0 S 1041Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D 1042# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1043Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1044 -7:00 Edm M%sT 1045 1046 1047# British Columbia 1048 1049# From Paul Eggert (2000-10-02): 1050# Shanks writes that since 1970 most of this region has been like Vancouver. 1051# Dawson Creek uses MST. Much of east BC is like Edmonton. 1052# Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1053 1054# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1055Rule Vanc 1918 only - Apr 14 2:00 1:00 D 1056Rule Vanc 1918 only - Oct 31 2:00 0 S 1057Rule Vanc 1942 only - Feb 9 2:00 1:00 W 1058Rule Vanc 1945 only - Sep 30 2:00 0 S 1059Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 1060Rule Vanc 1946 only - Oct 13 2:00 0 S 1061Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 1062Rule Vanc 1962 max - Oct lastSun 2:00 0 S 1063Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D 1064# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1065Zone America/Vancouver -8:12:28 - LMT 1884 1066 -8:00 Vanc P%sT 1067Zone America/Dawson_Creek -8:00:56 - LMT 1884 1068 -8:00 Canada P%sT 1947 1069 -8:00 Vanc P%sT 1972 Aug 30 2:00 1070 -7:00 - MST 1071 1072 1073# Northwest Territories, Nunavut, Yukon 1074 1075# From Paul Eggert (1999-10-29): 1076# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 1077# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs: 1078# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 1079# c. 7 defines Yukon standard time as UTC-9. This is still valid; 1080# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 1081# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 1082# * O.I.C. 1980/02 established DST. 1083# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 1084# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander. 1085 1086# From Rives McDow (1999-09-04): 1087# Nunavut ... moved ... to incorporate the whole territory into one time zone. 1088# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html"> 1089# Nunavut moves to single time zone Oct. 31 1090# </a> 1091# 1092# From Antoine Leca (1999-09-06): 1093# We then need to create a new timezone for the Kitikmeot region of Nunavut 1094# to differentiate it from the Yellowknife region. 1095 1096# From Paul Eggert (1999-09-20): 1097# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html"> 1098# Basic Facts: The New Territory 1099# </a> (1999) reports that Pangnirtung operates on eastern time, 1100# and that Coral Harbour does not observe DST. We don't know when 1101# Pangnirtung switched to eastern time; we'll guess 1995. 1102# We'll ignore the claim about Coral Harbour for now, 1103# since we have no further info. 1104 1105# From Rives McDow (1999-11-08): 1106# On October 31, when the rest of Nunavut went to Central time, 1107# Pangnirtung wobbled. Here is the result of their wobble: 1108# 1109# The following businesses and organizations in Pangnirtung use Central Time: 1110# 1111# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 1112# Eastern Arctic National Parks, A & D Specialist 1113# 1114# The following businesses and organizations in Pangnirtung use Eastern Time: 1115# 1116# Hamlet office, All other businesses, Both schools, Airport operator 1117# 1118# This has made for an interesting situation there, which warranted the news. 1119# No one there that I spoke with seems concerned, or has plans to 1120# change the local methods of keeping time, as it evidently does not 1121# really interfere with any activities or make things difficult locally. 1122# They plan to celebrate New Year's turn-over twice, one hour apart, 1123# so it appears that the situation will last at least that long. 1124# The Nunavut Intergovernmental Affairs hopes that they will "come to 1125# their senses", but the locals evidently don't see any problem with 1126# the current state of affairs. 1127 1128# From Michaela Rodrigue, writing in the 1129# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html"> 1130# Nunatsiaq News (1999-11-19)</a>: 1131# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 1132# central - or Nunavut time - for government offices, and eastern time 1133# for municipal offices and schools.... Igloolik [was similar but then] 1134# made the switch to central time on Saturday, Nov. 6. 1135 1136# From Paul Eggert (2000-10-02): 1137# Matthews and Vincent (1998) say the following, but we lack histories 1138# for these potential new Zones. 1139# 1140# The Canadian Forces station at Alert uses Eastern Time while the 1141# handful of residents at the Eureka weather station [in the Central 1142# zone] skip daylight savings. Baffin Island, which is crossed by the 1143# Central, Eastern and Atlantic Time zones only uses Eastern Time. 1144# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 1145# Central Time and Southampton Island [in the Central zone] is not 1146# required to use daylight savings. 1147 1148# From 1149# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html"> 1150# Nunavut now has two time zones 1151# </a> (2000-11-10): 1152# The Nunavut government would allow its employees in Kugluktuk and 1153# Cambridge Bay to operate on central time year-round, putting them 1154# one hour behind the rest of Nunavut for six months during the winter. 1155# At the end of October the two communities had rebelled against 1156# Nunavut's unified time zone, refusing to shift to eastern time with 1157# the rest of the territory for the winter. Cambridge Bay remained on 1158# central time, while Kugluktuk, even farther west, reverted to 1159# mountain time, which they had used before the advent of Nunavut's 1160# unified time zone in 1999. 1161# 1162# From Rives McDow (2001-01-20), quoting the Nunavut government: 1163# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 1164 1165# From Paul Eggert (2000-12-04): 1166# Let's just keep track of the official times for now. 1167 1168# From Rives McDow (2001-03-07): 1169# The premier of Nunavut has issued a ministerial statement advising 1170# that effective 2001-04-01, the territory of Nunavut will revert 1171# back to three time zones (mountain, central, and eastern). Of the 1172# cities in Nunavut, Coral Harbor is the only one that I know of that 1173# has said it will not observe dst, staying on EST year round. I'm 1174# checking for more info, and will get back to you if I come up with 1175# more. 1176# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 1177 1178# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1179Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 1180Rule NT_YK 1918 only - Oct 27 2:00 0 S 1181Rule NT_YK 1919 only - May 25 2:00 1:00 D 1182Rule NT_YK 1919 only - Nov 1 0:00 0 S 1183Rule NT_YK 1942 only - Feb 9 2:00 1:00 W 1184Rule NT_YK 1945 only - Sep 30 2:00 0 S 1185Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 1186Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 1187Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 1188Rule NT_YK 1980 max - Oct lastSun 2:00 0 S 1189Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D 1190# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1191Zone America/Pangnirtung -4:22:56 - LMT 1884 1192 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 1193 -5:00 Canada E%sT 1999 Oct 31 2:00 1194 -6:00 Canada C%sT 2000 Oct 29 2:00 1195 -5:00 Canada E%sT 1196Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987 1197 -5:00 NT_YK E%sT 1999 Oct 31 2:00 1198 -6:00 Canada C%sT 2000 Oct 29 2:00 1199 -5:00 Canada E%sT 1200Zone America/Rankin_Inlet -6:08:40 - LMT 1884 1201 -6:00 NT_YK C%sT 2000 Oct 29 2:00 1202 -5:00 - EST 2001 Apr 1 3:00 1203 -6:00 Canada C%sT 1204Zone America/Cambridge_Bay -7:00:20 - LMT 1884 1205 -7:00 NT_YK M%sT 1999 Oct 31 2:00 1206 -6:00 Canada C%sT 2000 Oct 29 2:00 1207 -5:00 - EST 2000 Nov 5 0:00 1208 -6:00 - CST 2001 Apr 1 3:00 1209 -7:00 Canada M%sT 1210Zone America/Yellowknife -7:37:24 - LMT 1884 1211 -7:00 NT_YK M%sT 1212Zone America/Inuvik -8:54:00 - LMT 1884 1213 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 1214 -7:00 NT_YK M%sT 1215Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 1216 -9:00 NT_YK Y%sT 1966 Jul 1 2:00 1217 -8:00 NT_YK P%sT 1218Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 1219 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 1220 -8:00 NT_YK P%sT 1221 1222 1223############################################################################### 1224 1225# Mexico 1226 1227# From Paul Eggert (2001-03-05): 1228# The Investigation and Analysis Service of the 1229# Mexican Library of Congress (MLoC) has published a 1230# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/"> 1231# history of Mexican local time (in Spanish) 1232# </a>. 1233# 1234# Here are the discrepancies between Shanks and the MLoC. 1235# (In all cases we go with the MLoC.) 1236# Shanks reports that Baja was at -8:00 in 1922/1923. 1237# Shanks says the 1930 transition in Baja was 1930-11-16. 1238# Shanks reports no DST during summer 1931. 1239# Shanks reports a transition at 1032-03-30 23:00, not 1932-04-01. 1240# Shanks does not report transitions for Baja in 1945 or 1948. 1241# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23. 1242# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00 1243# on 1997-10-26 at 02:00. 1244 1245# From Gwillim Law (2001-02-20): 1246# There are some other discrepancies between the Decrees page and the 1247# tz database. I think they can best be explained by supposing that 1248# the researchers who prepared the Decrees page failed to find some of 1249# the relevant documents. 1250 1251# From Paul Eggert (2000-07-26): 1252# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 1253# and 1988 DST experiments. Go with spin.com.mx. 1254 1255# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15): 1256# A guy from our Mexico subsidiary finally found the Presidential Decree 1257# outlining the timezone changes in Mexico. 1258# 1259# ------------- Begin Forwarded Message ------------- 1260# 1261# I finally got my hands on the Official Presidential Decree that sets up the 1262# rules for the DST changes. The rules are: 1263# 1264# 1. The country is divided in 3 timezones: 1265# - Baja California Norte (the Mexico/BajaNorte TZ) 1266# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 1267# - The rest of the country (the Mexico/General TZ) 1268# 1269# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 1270# at 2:00 AM, the times in each zone are as follows: 1271# BajaNorte: GMT+7 1272# BajaSur: GMT+6 1273# General: GMT+5 1274# 1275# 3. The rest of the year, the times are as follows: 1276# BajaNorte: GMT+8 1277# BajaSur: GMT+7 1278# General: GMT+6 1279# 1280# The Decree was published in Mexico's Official Newspaper on January 4th. 1281# 1282# -------------- End Forwarded Message -------------- 1283# From Paul Eggert (1996-06-12): 1284# For an English translation of the decree, see 1285# <a href="http://mexico-travel.com/extra/timezone_eng.html"> 1286# ``Diario Oficial: Time Zone Changeover'' (1996-01-04). 1287# </a> 1288 1289# From Rives McDow (1998-10-08): 1290# The State of Quintana Roo has reverted back to central STD and DST times 1291# (i.e. UTC -0600 and -0500 as of 1998-08-02). 1292 1293# From Rives McDow (2000-01-10): 1294# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 1295# zone 5 hours from the International Date Line, and will not observe daylight 1296# savings time so as to stay on the same time zone as the southern part of 1297# Arizona year round. 1298 1299# From Jesper Norgaard, translating 1300# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 1301# In Oaxaca, the 55.000 teachers from the Section 22 of the National 1302# Syndicate of Education Workers, refuse to apply daylight saving each 1303# year, so that the more than 10,000 schools work at normal hour the 1304# whole year. 1305 1306# From Gwillim Law (2001-01-19): 1307# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 1308# (translated):... 1309# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 1310# that Summer Time will be reduced from seven to five months, starting 1311# this year.... 1312# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001> 1313# [translated], says "summer time will ... take effect on the first Sunday 1314# in May, and end on the last Sunday of September. 1315 1316# From Arthur David Olson (2001-01-25): 1317# The 2001-01-24 traditional Washington Post contained the page one 1318# story "Timely Issue Divides Mexicans."... 1319# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 1320# ... Mexico City Mayor Lopez Obrador "...is threatening to keep 1321# Mexico City and its 20 million residents on a different time than 1322# the rest of the country..." In particular, Lopez Obrador would abolish 1323# observation of Daylight Saving Time. 1324 1325# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre"> 1326# Official statute published by the Energy Department 1327# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 1328# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03). 1329 1330# From Paul Eggert (2001-03-03): 1331# 1332# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html"> 1333# James F. Smith writes in today's LA Times 1334# </a> 1335# * Sonora will continue to observe standard time. 1336# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that 1337# the Federal District will not adopt DST. 1338# * 4 of 16 district leaders announced they'll ignore the decree. 1339# * The decree does not affect federal-controlled facilities including 1340# the airport, banks, hospitals, and schools. 1341# 1342# For now we'll assume that the Federal District will bow to federal rules. 1343 1344# From Jesper Norgaard (2001-04-01): 1345# I found some references to the Mexican application of daylight 1346# saving, which modifies what I had already sent you, stating earlier 1347# that a number of northern Mexican states would go on daylight 1348# saving. The modification reverts this to only cover Baja California 1349# (Norte), while all other states (except Sonora, who has no daylight 1350# saving all year) will follow the original decree of president 1351# Vicente Fox, starting daylight saving May 6, 2001 and ending 1352# September 30, 2001. 1353# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp> 1354# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 1355 1356# From Reuters (2001-09-04): 1357# Mexico's Supreme Court on Tuesday declared that daylight savings was 1358# unconstitutional in Mexico City, creating the possibility the 1359# capital will be in a different time zone from the rest of the nation 1360# next year.... The Supreme Court's ruling takes effect at 2:00 1361# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 1362# standard time. "This is so residents of the Federal District are not 1363# subject to unexpected time changes," a statement from the court said. 1364 1365# From Jesper Norgaard Welen (2002-03-12): 1366# ... consulting my local grocery store(!) and my coworkers, they all insisted 1367# that a new decision had been made to reinstate US style DST in Mexico.... 1368# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 1369# confirms this. Sonora as usual is the only state where DST is not applied. 1370 1371# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1372Rule Mexico 1939 only - Feb 5 0:00 1:00 D 1373Rule Mexico 1939 only - Jun 25 0:00 0 S 1374Rule Mexico 1940 only - Dec 9 0:00 1:00 D 1375Rule Mexico 1941 only - Apr 1 0:00 0 S 1376Rule Mexico 1943 only - Dec 16 0:00 1:00 W 1377Rule Mexico 1944 only - May 1 0:00 0 S 1378Rule Mexico 1950 only - Feb 12 0:00 1:00 D 1379Rule Mexico 1950 only - Jul 30 0:00 0 S 1380Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 1381Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 1382Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 1383Rule Mexico 2001 only - Sep lastSun 2:00 0 S 1384Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 1385Rule Mexico 2002 max - Oct lastSun 2:00 0 S 1386# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1387# Quintana Roo 1388Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 1389 -6:00 - CST 1981 Dec 23 1390 -5:00 Mexico E%sT 1998 Aug 2 2:00 1391 -6:00 Mexico C%sT 1392# Campeche, Yucatan 1393Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 1394 -6:00 - CST 1981 Dec 23 1395 -5:00 - EST 1982 Dec 2 1396 -6:00 Mexico C%sT 1397# Coahuila, Durango, Nuevo Leon, Tamaulipas 1398Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 1399 -6:00 - CST 1988 1400 -6:00 US C%sT 1989 1401 -6:00 Mexico C%sT 1402# Central Mexico 1403Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 1404 -7:00 - MST 1927 Jun 10 23:00 1405 -6:00 - CST 1930 Nov 15 1406 -7:00 - MST 1931 May 1 23:00 1407 -6:00 - CST 1931 Oct 1408 -7:00 - MST 1932 Apr 1 1409 -6:00 Mexico C%sT 2001 Sep 30 02:00 1410 -6:00 - CST 2002 Feb 20 1411 -6:00 Mexico C%sT 1412# Chihuahua 1413Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 1414 -7:00 - MST 1927 Jun 10 23:00 1415 -6:00 - CST 1930 Nov 15 1416 -7:00 - MST 1931 May 1 23:00 1417 -6:00 - CST 1931 Oct 1418 -7:00 - MST 1932 Apr 1 1419 -6:00 - CST 1996 1420 -6:00 Mexico C%sT 1998 1421 -6:00 - CST 1998 Apr Sun>=1 3:00 1422 -7:00 Mexico M%sT 1423# Sonora 1424Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 1425 -7:00 - MST 1927 Jun 10 23:00 1426 -6:00 - CST 1930 Nov 15 1427 -7:00 - MST 1931 May 1 23:00 1428 -6:00 - CST 1931 Oct 1429 -7:00 - MST 1932 Apr 1 1430 -6:00 - CST 1942 Apr 24 1431 -7:00 - MST 1949 Jan 14 1432 -8:00 - PST 1970 1433 -7:00 Mexico M%sT 1999 1434 -7:00 - MST 1435# Baja California Sur, Nayarit, Sinaloa 1436Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 1437 -7:00 - MST 1927 Jun 10 23:00 1438 -6:00 - CST 1930 Nov 15 1439 -7:00 - MST 1931 May 1 23:00 1440 -6:00 - CST 1931 Oct 1441 -7:00 - MST 1932 Apr 1 1442 -6:00 - CST 1942 Apr 24 1443 -7:00 - MST 1949 Jan 14 1444 -8:00 - PST 1970 1445 -7:00 Mexico M%sT 1446# Baja California 1447Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 1448 -7:00 - MST 1924 1449 -8:00 - PST 1927 Jun 10 23:00 1450 -7:00 - MST 1930 Nov 15 1451 -8:00 - PST 1931 Apr 1 1452 -8:00 1:00 PDT 1931 Sep 30 1453 -8:00 - PST 1942 Apr 24 1454 -8:00 1:00 PWT 1945 Nov 12 1455 -8:00 - PST 1948 Apr 5 1456 -8:00 1:00 PDT 1949 Jan 14 1457 -8:00 - PST 1954 1458 -8:00 CA P%sT 1961 1459 -8:00 - PST 1976 1460 -8:00 US P%sT 1996 1461 -8:00 Mexico P%sT 2001 1462 -8:00 US P%sT 2002 Feb 20 1463 -8:00 Mexico P%sT 1464# From Paul Eggert (2001-03-05): 1465# Formerly there was an America/Ensenada zone, which differed from 1466# America/Tijuana only in that it did not observe DST from 1976 1467# through 1995. This was as per Shanks. However, Guy Harris reports 1468# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and 1469# Tijuana observe DST," which contradicts Shanks but does imply that 1470# DST-observance was a town-by-town matter back then. This concerns 1471# data after 1970 so most likely there should be at least one Zone 1472# other than America/Tijuana for Baja, but it's not clear yet what its 1473# name or contents should be. 1474# 1475# Revillagigedo Is 1476# no information 1477 1478############################################################################### 1479 1480# Anguilla 1481# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1482Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 1483 -4:00 - AST 1484 1485# Antigua and Barbuda 1486# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1487Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 1488 -5:00 - EST 1951 1489 -4:00 - AST 1490 1491# Bahamas 1492# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1493Rule Bahamas 1964 max - Oct lastSun 2:00 0 S 1494Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D 1495Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D 1496# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1497Zone America/Nassau -5:09:24 - LMT 1912 Mar 2 1498 -5:00 Bahamas E%sT 1499 1500# Barbados 1501# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1502Rule Barb 1977 only - Jun 12 2:00 1:00 D 1503Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 1504Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 1505Rule Barb 1979 only - Sep 30 2:00 0 S 1506Rule Barb 1980 only - Sep 25 2:00 0 S 1507# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1508Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown 1509 -3:58:28 - BMT 1932 # Bridgetown Mean Time 1510 -4:00 Barb A%sT 1511 1512# Belize 1513# Whitman entirely disagrees with Shanks; go with Shanks. 1514# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1515Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD 1516Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S 1517Rule Belize 1973 only - Dec 5 0:00 1:00 D 1518Rule Belize 1974 only - Feb 9 0:00 0 S 1519Rule Belize 1982 only - Dec 18 0:00 1:00 D 1520Rule Belize 1983 only - Feb 12 0:00 0 S 1521# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1522Zone America/Belize -5:52:48 - LMT 1912 Apr 1523 -6:00 Belize C%sT 1524 1525# Bermuda 1526# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1527Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton 1528 -4:00 - AST 1974 Apr 28 2:00 1529 -4:00 Bahamas A%sT 1530 1531# Cayman Is 1532# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1533Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown 1534 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1535 -5:00 - EST 1536 1537# Costa Rica 1538# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1539Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 1540Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 1541Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 1542# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks. 1543Rule CR 1991 only - Jul 1 0:00 0 S 1544Rule CR 1992 only - Mar 15 0:00 0 S 1545# There are too many San Joses elsewhere, so we'll use `Costa Rica'. 1546# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1547Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose 1548 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time 1549 -6:00 CR C%sT 1550# Coco 1551# no information; probably like America/Costa_Rica 1552 1553# Cuba 1554 1555# From Arthur David Olson (1999-03-29): 1556# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 1557# the Cuban National Team and the Baltimore Orioles was carried live on 1558# the Orioles Radio Network, including affiliate WTOP in Washington, DC. 1559# During the game, play-by-play announcer Jim Hunter noted that 1560# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 1561# Time today." (The "two hour" remark referred to losing one hour of 1562# sleep on 1999-03-28--when the announcers were in Cuba as it switched 1563# to DST--and one more hour on 1999-04-04--when the announcers will have 1564# returned to Baltimore, which switches on that date.) 1565 1566# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1567Rule Cuba 1928 only - Jun 10 0:00 1:00 D 1568Rule Cuba 1928 only - Oct 10 0:00 0 S 1569Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 1570Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 1571Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 1572Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 1573Rule Cuba 1965 only - Jun 1 0:00 1:00 D 1574Rule Cuba 1965 only - Sep 30 0:00 0 S 1575Rule Cuba 1966 only - May 29 0:00 1:00 D 1576Rule Cuba 1966 only - Oct 2 0:00 0 S 1577Rule Cuba 1967 only - Apr 8 0:00 1:00 D 1578Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 1579Rule Cuba 1968 only - Apr 14 0:00 1:00 D 1580Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 1581Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 1582Rule Cuba 1972 1974 - Oct 8 0:00 0 S 1583Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 1584Rule Cuba 1978 only - May 7 0:00 1:00 D 1585Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 1586Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 1587Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 1588Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 1589Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 1590Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 1591Rule Cuba 1996 only - Oct 6 0:00s 0 S 1592Rule Cuba 1997 only - Oct 12 0:00s 0 S 1593Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 1594Rule Cuba 1998 max - Oct lastSun 0:00s 0 S 1595Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D 1596 1597# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1598Zone America/Havana -5:29:28 - LMT 1890 1599 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 1600 -5:00 Cuba C%sT 1601 1602# Dominica 1603# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1604Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau 1605 -4:00 - AST 1606 1607# Dominican Republic 1608 1609# From Steffen Thorsen (2000-10-30): 1610# Enrique Morales reported to me that the Dominican Republic has changed the 1611# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 1612# http://www.listin.com.do/antes/261000/republica/princi.html 1613 1614# From Paul Eggert (2000-12-04): 1615# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 1616 1617# From Rives McDow (2000-12-01): 1618# Dominican Republic changed its mind and presidential decree on Tuesday, 1619# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 1620# Dominican Republic will be reverting to 8 hours from the International Date 1621# Line, and will not be using DST in the foreseeable future. The reason they 1622# decided to use DST was to be in synch with Puerto Rico, who was also going 1623# to implement DST. When Puerto Rico didn't implement DST, the president 1624# decided to revert. 1625 1626 1627# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1628Rule DR 1966 only - Oct 30 0:00 1:00 D 1629Rule DR 1967 only - Feb 28 0:00 0 S 1630Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD 1631Rule DR 1970 only - Feb 21 0:00 0 S 1632Rule DR 1971 only - Jan 20 0:00 0 S 1633Rule DR 1972 1974 - Jan 21 0:00 0 S 1634# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1635Zone America/Santo_Domingo -4:39:36 - LMT 1890 1636 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 1637 -5:00 DR E%sT 1974 Oct 27 1638 -4:00 - AST 2000 Oct 29 02:00 1639 -5:00 US E%sT 2000 Dec 3 01:00 1640 -4:00 - AST 1641 1642# El Salvador 1643# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1644Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 1645Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 1646# There are too many San Salvadors elsewhere, so we'll use `El Salvador'. 1647# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1648Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 1649 -6:00 Salv C%sT 1650 1651# Grenada 1652# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1653Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's 1654 -4:00 - AST 1655 1656# Guadeloupe 1657# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1658Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre 1659 -4:00 - AST 1660 1661# Guatemala 1662# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1663Rule Guat 1973 only - Nov 25 0:00 1:00 D 1664Rule Guat 1974 only - Feb 24 0:00 0 S 1665Rule Guat 1983 only - May 21 0:00 1:00 D 1666Rule Guat 1983 only - Sep 22 0:00 0 S 1667Rule Guat 1991 only - Mar 23 0:00 1:00 D 1668Rule Guat 1991 only - Sep 7 0:00 0 S 1669# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1670Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 1671 -6:00 Guat C%sT 1672 1673# Haiti 1674# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1675Rule Haiti 1983 only - May 8 0:00 1:00 D 1676Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 1677Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 1678# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA. 1679Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 1680Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 1681# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1682Zone America/Port-au-Prince -4:49:20 - LMT 1890 1683 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 1684 -5:00 Haiti E%sT 1685 1686# Honduras 1687# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1. 1688# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1689Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 1690 -6:00 Salv C%sT 1691# 1692# Great Swan I ceded by US to Honduras in 1972 1693 1694# Jamaica 1695 1696# From Bob Devine (1988-01-28): 1697# Follows US rules. 1698 1699# From U. S. Naval Observatory (1989-01-19): 1700# JAMAICA 5 H BEHIND UTC 1701 1702# From Shanks: 1703# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1704Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston 1705 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1706 -5:00 - EST 1974 Apr 28 2:00 1707 -5:00 US E%sT 1984 1708 -5:00 - EST 1709 1710# Martinique 1711# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1712Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 1713 -4:04:20 - FFMT 1911 May # Fort-de-France MT 1714 -4:00 - AST 1980 Apr 6 1715 -4:00 1:00 ADT 1980 Sep 28 1716 -4:00 - AST 1717 1718# Montserrat 1719# From Paul Eggert (1997-08-31): 1720# Recent volcanic eruptions have forced evacuation of Plymouth, the capital. 1721# Luckily, Olveston, the current de facto capital, has the same longitude. 1722# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1723Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston 1724 -4:00 - AST 1725 1726# Nicaragua 1727# 1728# From Steffen Thorsen (1998-12-29): 1729# Nicaragua seems to be back at -6:00 but I have not been able to find when 1730# they changed from -5:00. 1731# 1732# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1733Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 1734Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 1735Rule Nic 1992 only - Jan 1 4:00 1:00 D 1736Rule Nic 1992 only - Sep 24 0:00 0 S 1737# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1738Zone America/Managua -5:45:08 - LMT 1890 1739 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 1740 -6:00 - CST 1973 May 1741 -5:00 - EST 1975 Feb 16 1742 -6:00 Nic C%sT 1993 Jan 1 4:00 1743 -5:00 - EST 1998 Dec 1744 -6:00 - CST 1745 1746# Panama 1747# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1748Zone America/Panama -5:18:08 - LMT 1890 1749 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time 1750 -5:00 - EST 1751 1752# Puerto Rico 1753# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'. 1754# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1755Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 1756 -4:00 - AST 1942 May 3 1757 -4:00 1:00 AWT 1945 Sep 30 2:00 1758 -4:00 - AST 1759 1760# St Kitts-Nevis 1761# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1762Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre 1763 -4:00 - AST 1764 1765# St Lucia 1766# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1767Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries 1768 -4:04:00 - CMT 1912 # Castries Mean Time 1769 -4:00 - AST 1770 1771# St Pierre and Miquelon 1772# There are too many St Pierres elsewhere, so we'll use `Miquelon'. 1773# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1774Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 1775 -4:00 - AST 1980 May 1776 -3:00 Mont PM%sT # Pierre & Miquelon Time 1777 1778# St Vincent and the Grenadines 1779# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1780Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown 1781 -4:04:56 - KMT 1912 # Kingstown Mean Time 1782 -4:00 - AST 1783 1784# Turks and Caicos 1785# From Paul Eggert (1998-08-06): 1786# Shanks says they use US DST rules, but IATA SSIM (1991/1998) 1787# says they switch at midnight. Go with IATA SSIM. 1788# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1789Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D 1790Rule TC 1979 max - Oct lastSun 0:00 0 S 1791Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D 1792# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1793Zone America/Grand_Turk -4:44:32 - LMT 1890 1794 -5:07:12 - KMT 1912 Feb # Kingston Mean Time 1795 -5:00 TC E%sT 1796 1797# British Virgin Is 1798# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1799Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town 1800 -4:00 - AST 1801 1802# Virgin Is 1803# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1804Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie 1805 -4:00 - AST 1806