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