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. 7 # 8 # This code is distributed in the hope that it will be useful, but WITHOUT 9 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 # version 2 for more details (a copy is included in the LICENSE file that 12 # accompanied this code). 13 # 14 # You should have received a copy of the GNU General Public License version 15 # 2 along with this work; if not, write to the Free Software Foundation, 16 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 # 18 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 # or visit www.oracle.com if you need additional information or have any 20 # questions. 21 # 22 # tzdb data for North and Central America and environs 23 24 # This file is in the public domain, so clarified as of 25 # 2009-05-17 by Arthur David Olson. 26 27 # also includes Central America and the Caribbean 28 29 # This file is by no means authoritative; if you think you know better, 30 # go ahead and edit the file (and please send any changes to 31 # tz@iana.org for general use in the future). For more, please see 32 # the file CONTRIBUTING in the tz distribution. 33 34 # From Paul Eggert (1999-03-22): 35 # A reliable and entertaining source about time zones is 36 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). 37 38 ############################################################################### 39 40 # United States 41 42 # From Paul Eggert (1999-03-31): 43 # Howse writes (pp 121-125) that time zones were invented by 44 # Professor Charles Ferdinand Dowd (1825-1904), 45 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). 46 # His pamphlet "A System of National Time for Railroads" (1870) 47 # was the result of his proposals at the Convention of Railroad Trunk Lines 48 # in New York City (1869-10). His 1870 proposal was based on Washington, DC, 49 # but in 1872-05 he moved the proposed origin to Greenwich. 50 51 # From Paul Eggert (2018-03-20): 52 # Dowd's proposal left many details unresolved, such as where to draw 53 # lines between time zones. The key individual who made time zones 54 # work in the US was William Frederick Allen - railway engineer, 55 # managing editor of the Travelers' Guide, and secretary of the 56 # General Time Convention, a railway standardization group. Allen 57 # spent months in dialogs with scientific and railway leaders, 58 # developed a workable plan to institute time zones, and presented it 59 # to the General Time Convention on 1883-04-11, saying that his plan 60 # meant "local time would be practically abolished" - a plus for 61 # railway scheduling. By the next convention on 1883-10-11 nearly all 62 # railroads had agreed and it took effect on 1883-11-18. That Sunday 63 # was called the "day of two noons", as some locations observed noon 64 # twice. Allen witnessed the transition in New York City, writing: 65 # 66 # I heard the bells of St. Paul's strike on the old time. Four 67 # minutes later, obedient to the electrical signal from the Naval 68 # Observatory ... the time-ball made its rapid descent, the chimes 69 # of old Trinity rang twelve measured strokes, and local time was 70 # abandoned, probably forever. 71 # 72 # Most of the US soon followed suit. See: 73 # Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56. 74 # https://dx.doi.org/10.2307/3105430 75 76 # From Paul Eggert (2005-04-16): 77 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time. 78 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). 79 80 # From Paul Eggert (2006-03-22): 81 # A good source for time zone historical data in the US is 82 # Thomas G. Shanks, The American Atlas (5th edition), 83 # San Diego: ACS Publications, Inc. (1991). 84 # Make sure you have the errata sheet; the book is somewhat useless without it. 85 # It is the source for most of the pre-1991 US entries below. 86 87 # From Paul Eggert (2001-03-06): 88 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin 89 # in his whimsical essay "An Economical Project for Diminishing the Cost 90 # of Light" published in the Journal de Paris (1784-04-26). 91 # Not everyone is happy with the results: 92 # 93 # I don't really care how time is reckoned so long as there is some 94 # agreement about it, but I object to being told that I am saving 95 # daylight when my reason tells me that I am doing nothing of the kind. 96 # I even object to the implication that I am wasting something 97 # valuable if I stay in bed after the sun has risen. As an admirer 98 # of moonlight I resent the bossy insistence of those who want to 99 # reduce my time for enjoying it. At the back of the Daylight Saving 100 # scheme I detect the bony, blue-fingered hand of Puritanism, eager 101 # to push people into bed earlier, and get them up earlier, to make 102 # them healthy, wealthy and wise in spite of themselves. 103 # 104 # -- Robertson Davies, The diary of Samuel Marchbanks, 105 # Clarke, Irwin (1947), XIX, Sunday 106 # 107 # For more about the first ten years of DST in the United States, see 108 # Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint 109 # (Carnegie Library of Pittsburgh, 1927). 110 # http://www.clpgh.org/exhibit/dst.html 111 # 112 # Shanks says that DST was called "War Time" in the US in 1918 and 1919. 113 # However, DST was imposed by the Standard Time Act of 1918, which 114 # was the first nationwide legal time standard, and apparently 115 # time was just called "Standard Time" or "Daylight Saving Time". 116 117 # From Arthur David Olson: 118 # US Daylight Saving Time ended on the last Sunday of *October* in 1974. 119 # See, for example, the front page of the Saturday, 1974-10-26 120 # and Sunday, 1974-10-27 editions of the Washington Post. 121 122 # From Arthur David Olson: 123 # Before the Uniform Time Act of 1966 took effect in 1967, observance of 124 # Daylight Saving Time in the US was by local option, except during wartime. 125 126 # From Arthur David Olson (2000-09-25): 127 # Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. 128 # In the introduction, Oboler spoke of "Eastern Peace Time." 129 # An AltaVista search turned up: 130 # https://web.archive.org/web/20000926032210/http://rowayton.org/rhs/hstaug45.html 131 # "When the time is announced over the radio now, it is 'Eastern Peace 132 # Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." 133 # (August 1945) by way of confirmation. 134 # 135 # From Paul Eggert (2017-09-23): 136 # This was the V-J Day issue of the Clamdigger, a Rowayton, CT newsletter. 137 138 # From Joseph Gallant citing 139 # George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): 140 # At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set 141 # to switch to London for Attlee's address, but the American people 142 # never got to hear his speech live. According to one press account, 143 # CBS' Bob Trout was first to announce the word of Japan's surrender, 144 # but a few seconds later, NBC, ABC and Mutual also flashed the word 145 # of surrender, all of whom interrupting the bells of Big Ben in 146 # London which were to precede Mr. Attlee's speech. 147 148 # From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From 149 # Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: 150 # 151 # ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. 152 # Any announcement from Asia would reach St. John's New York newsroom on a 153 # wire service teletype machine, which had prescribed signals for major news. 154 # Associated Press, for example, would ring five bells before spewing out 155 # typed copy of an important story, and 10 bells for news "of transcendental 156 # importance." 157 # 158 # On Aug. 14, stalling while talking steadily into the NBC networks' open 159 # microphone, St. John heard five bells and waited only to hear a sixth bell, 160 # before announcing confidently: "Ladies and gentlemen, World War II is over. 161 # The Japanese have agreed to our surrender terms." 162 # 163 # He had scored a 20-second scoop on other broadcasters. 164 165 # From Arthur David Olson (2005-08-22): 166 # Paul has been careful to use the "US" rules only in those locations 167 # that are part of the United States; this reflects the real scope of 168 # U.S. government action. So even though the "US" rules have changed 169 # in the latest release, other countries won't be affected. 170 171 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 172 Rule US 1918 1919 - Mar lastSun 2:00 1:00 D 173 Rule US 1918 1919 - Oct lastSun 2:00 0 S 174 Rule US 1942 only - Feb 9 2:00 1:00 W # War 175 Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace 176 Rule US 1945 only - Sep lastSun 2:00 0 S 177 Rule US 1967 2006 - Oct lastSun 2:00 0 S 178 Rule US 1967 1973 - Apr lastSun 2:00 1:00 D 179 Rule US 1974 only - Jan 6 2:00 1:00 D 180 Rule US 1975 only - Feb 23 2:00 1:00 D 181 Rule US 1976 1986 - Apr lastSun 2:00 1:00 D 182 Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D 183 Rule US 2007 max - Mar Sun>=8 2:00 1:00 D 184 Rule US 2007 max - Nov Sun>=1 2:00 0 S 185 186 # From Arthur David Olson, 2005-12-19 187 # We generate the files specified below to guard against old files with 188 # obsolete information being left in the time zone binary directory. 189 # We limit the list to names that have appeared in previous versions of 190 # this time zone package. 191 # We do these as separate Zones rather than as Links to avoid problems if 192 # a particular place changes whether it observes DST. 193 # We put these specifications here in the northamerica file both to 194 # increase the chances that they'll actually get compiled and to 195 # avoid the need to duplicate the US rules in another file. 196 197 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 198 Zone EST -5:00 - EST 199 Zone MST -7:00 - MST 200 Zone HST -10:00 - HST 201 Zone EST5EDT -5:00 US E%sT 202 Zone CST6CDT -6:00 US C%sT 203 Zone MST7MDT -7:00 US M%sT 204 Zone PST8PDT -8:00 US P%sT 205 206 # From U. S. Naval Observatory (1989-01-19): 207 # USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON 208 # USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 209 # USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON 210 # USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 211 # USA MOUNTAIN 7 H BEHIND UTC DENVER 212 # USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 213 # USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO 214 # USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 215 # USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) 216 # USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) 217 # USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W 218 # USA " 9 H BEHIND UTC APR 3 - OCT 30 219 # USA HAWAII 10 H BEHIND UTC 220 # USA BERING 11 H BEHIND UTC SAMOA, MIDWAY 221 222 # From Arthur David Olson (1989-01-21): 223 # The above dates are for 1988. 224 # Note the "AKST" and "AKDT" abbreviations, the claim that there's 225 # no DST in Samoa, and the claim that there is DST in Alaska and the 226 # Aleutians. 227 228 # From Arthur David Olson (1988-02-13): 229 # Legal standard time zone names, from United States Code (1982 Edition and 230 # Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names 231 # up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 232 # took effect), as explained in sections 263 and 261: 233 # (none) 234 # United States standard eastern time 235 # United States standard mountain time 236 # United States standard central time 237 # United States standard Pacific time 238 # (none) 239 # United States standard Alaska time 240 # (none) 241 # Next, names from 1967-04-01 until 1983-11-30 (the date for 242 # public law 98-181): 243 # Atlantic standard time 244 # eastern standard time 245 # central standard time 246 # mountain standard time 247 # Pacific standard time 248 # Yukon standard time 249 # Alaska-Hawaii standard time 250 # Bering standard time 251 # And after 1983-11-30: 252 # Atlantic standard time 253 # eastern standard time 254 # central standard time 255 # mountain standard time 256 # Pacific standard time 257 # Alaska standard time 258 # Hawaii-Aleutian standard time 259 # Samoa standard time 260 # The law doesn't give abbreviations. 261 # 262 # From Paul Eggert (2016-12-19): 263 # Here are URLs for the 1918 and 1966 legislation: 264 # http://uscode.house.gov/statviewer.htm?volume=40&page=451 265 # http://uscode.house.gov/statviewer.htm?volume=80&page=108 266 # Although the 1918 names were officially "United States Standard 267 # Eastern Time" and similarly for "Central", "Mountain", "Pacific", 268 # and "Alaska", in practice "Standard" was placed just before "Time", 269 # as codified in 1966. In practice, Alaska time was abbreviated "AST" 270 # before 1968. Summarizing the 1967 name changes: 271 # 1918 names 1967 names 272 # -08 Standard Pacific Time (PST) Pacific standard time (PST) 273 # -09 (unofficial) Yukon (YST) Yukon standard time (YST) 274 # -10 Standard Alaska Time (AST) Alaska-Hawaii standard time (AHST) 275 # -11 (unofficial) Nome (NST) Bering standard time (BST) 276 # 277 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: 278 # Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time" 279 # for time in Guam and the Northern Marianas. See the file "australasia". 280 # 281 # From Paul Eggert (2015-04-17): 282 # HST and HDT are standardized abbreviations for Hawaii-Aleutian 283 # standard and daylight times. See section 9.47 (p 234) of the 284 # U.S. Government Printing Office Style Manual (2008) 285 # https://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf 286 287 # From Arthur David Olson, 2005-08-09 288 # The following was signed into law on 2005-08-08. 289 # 290 # H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. 291 # (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15 292 # U.S.C. 260a(a)) is amended-- 293 # (1) by striking "first Sunday of April" and inserting "second 294 # Sunday of March"; and 295 # (2) by striking "last Sunday of October" and inserting "first 296 # Sunday of November'. 297 # (b) Effective Date.--Subsection (a) shall take effect 1 year after the 298 # date of enactment of this Act or March 1, 2007, whichever is later. 299 # (c) Report to Congress.--Not later than 9 months after the effective 300 # date stated in subsection (b), the Secretary shall report to Congress 301 # on the impact of this section on energy consumption in the United 302 # States. 303 # (d) Right to Revert.--Congress retains the right to revert the 304 # Daylight Saving Time back to the 2005 time schedules once the 305 # Department study is complete. 306 307 # US eastern time, represented by New York 308 309 # Connecticut, Delaware, District of Columbia, most of Florida, 310 # Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky 311 # (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, 312 # New Hampshire, New Jersey, New York, North Carolina, Ohio, 313 # Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, 314 # Vermont, Virginia, West Virginia 315 316 # From Dave Cantor (2004-11-02): 317 # Early this summer I had the occasion to visit the Mount Washington 318 # Observatory weather station atop (of course!) Mount Washington [, NH].... 319 # One of the staff members said that the station was on Eastern Standard Time 320 # and didn't change their clocks for Daylight Saving ... so that their 321 # reports will always have times which are 5 hours behind UTC. 322 323 # From Paul Eggert (2005-08-26): 324 # According to today's Huntsville Times 325 # http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1 326 # a few towns on Alabama's "eastern border with Georgia, such as Phenix City 327 # in Russell County, Lanett in Chambers County and some towns in Lee County, 328 # set their watches and clocks on Eastern time." It quotes H.H. "Bubba" 329 # Roberts, city administrator in Phenix City. as saying "We are in the Central 330 # time zone, but we do go by the Eastern time zone because so many people work 331 # in Columbus." 332 # 333 # From Paul Eggert (2017-02-22): 334 # Four cities are involved. The two not mentioned above are Smiths Station 335 # and Valley. Barbara Brooks, Valley's assistant treasurer, heard it started 336 # because West Point Pepperell textile mills were in Alabama while the 337 # corporate office was in Georgia, and residents voted to keep Eastern 338 # time even after the mills closed. See: Kazek K. Did you know which 339 # Alabama towns are in a different time zone? al.com 2017-02-06. 340 # http://www.al.com/living/index.ssf/2017/02/do_you_know_which_alabama_town.html 341 342 # From Paul Eggert (2014-09-06): 343 # Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208 344 # says that New York City Hall time was 3 minutes 58.4 seconds fast of 345 # Eastern time (i.e., -4:56:01.6) just before the 1883 switch. Round to the 346 # nearest second. 347 348 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 349 Rule NYC 1920 only - Mar lastSun 2:00 1:00 D 350 Rule NYC 1920 only - Oct lastSun 2:00 0 S 351 Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D 352 Rule NYC 1921 1954 - Sep lastSun 2:00 0 S 353 Rule NYC 1955 1966 - Oct lastSun 2:00 0 S 354 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 355 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 356 -5:00 US E%sT 1920 357 -5:00 NYC E%sT 1942 358 -5:00 US E%sT 1946 359 -5:00 NYC E%sT 1967 360 -5:00 US E%sT 361 362 # US central time, represented by Chicago 363 364 # Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, 365 # Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and 366 # Washington counties), Illinois, western Indiana 367 # (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 368 # Vanderburgh, and Warrick counties), Iowa, most of Kansas, western 369 # Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern 370 # Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, 371 # western Tennessee, most of Texas, Wisconsin 372 373 # From Paul Eggert (2018-01-07): 374 # In 1869 the Chicago Astronomical Society contracted with the city to keep 375 # time. Though delayed by the Great Fire, by 1880 a wire ran from the 376 # Dearborn Observatory (on the University of Chicago campus) to City Hall, 377 # which then sent signals to police and fire stations. However, railroads got 378 # their time signals from the Allegheny Observatory, the Madison Observatory, 379 # the Ann Arbor Observatory, etc., so their clocks did not agree with each 380 # other or with the city's official time. The confusion took some years to 381 # clear up. See: 382 # Moser M. How Chicago gave America its time zones. Chicago. 2018-01-04. 383 # http://www.chicagomag.com/city-life/January-2018/How-Chicago-Gave-America-Its-Time-Zones/ 384 385 # From Larry M. Smith (2006-04-26) re Wisconsin: 386 # https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf 387 # is currently enforced at the 01:00 time of change. Because the local 388 # "bar time" in the state corresponds to 02:00, a number of citations 389 # are issued for the "sale of class 'B' alcohol after prohibited 390 # hours" within the deviated hour of this change every year.... 391 # 392 # From Douglas R. Bomberg (2007-03-12): 393 # Wisconsin has enacted (nearly eleventh-hour) legislation to get WI 394 # Statue 175 closer in synch with the US Congress' intent.... 395 # https://docs.legis.wisconsin.gov/2007/related/acts/3 396 397 # From an email administrator of the City of Fort Pierre, SD (2015-12-21): 398 # Fort Pierre is technically located in the Mountain time zone as is 399 # the rest of Stanley County. Most of Stanley County and Fort Pierre 400 # uses the Central time zone due to doing most of their business in 401 # Pierre so it simplifies schedules. I have lived in Stanley County 402 # all my life and it has been that way since I can remember. (43 years!) 403 # 404 # From Paul Eggert (2015-12-25): 405 # Assume this practice predates 1970, so Fort Pierre can use America/Chicago. 406 407 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 408 Rule Chicago 1920 only - Jun 13 2:00 1:00 D 409 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S 410 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D 411 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D 412 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S 413 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S 414 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 415 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 416 -6:00 US C%sT 1920 417 -6:00 Chicago C%sT 1936 Mar 1 2:00 418 -5:00 - EST 1936 Nov 15 2:00 419 -6:00 Chicago C%sT 1942 420 -6:00 US C%sT 1946 421 -6:00 Chicago C%sT 1967 422 -6:00 US C%sT 423 # Oliver County, ND switched from mountain to central time on 1992-10-25. 424 Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 425 -7:00 US M%sT 1992 Oct 25 2:00 426 -6:00 US C%sT 427 # Morton County, ND, switched from mountain to central time on 428 # 2003-10-26, except for the area around Mandan which was already central time. 429 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>. 430 # Officially this switch also included part of Sioux County, and 431 # Jones, Mellette, and Todd Counties in South Dakota; 432 # but in practice these other counties were already observing central time. 433 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>. 434 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21 435 -7:00 US M%sT 2003 Oct 26 2:00 436 -6:00 US C%sT 437 438 # From Josh Findley (2011-01-21): 439 # ...it appears that Mercer County, North Dakota, changed from the 440 # mountain time zone to the central time zone at the last transition from 441 # daylight-saving to standard time (on Nov. 7, 2010): 442 # https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm 443 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html 444 445 # From Andy Lipscomb (2011-01-24): 446 # ...according to the Census Bureau, the largest city is Beulah (although 447 # it's commonly referred to as Beulah-Hazen, with Hazen being the next 448 # largest city in Mercer County). Google Maps places Beulah's city hall 449 # at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07". 450 451 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53 452 -7:00 US M%sT 2010 Nov 7 2:00 453 -6:00 US C%sT 454 455 # US mountain time, represented by Denver 456 # 457 # Colorado, far western Kansas, Montana, western 458 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), 459 # New Mexico, southwestern North Dakota, 460 # western South Dakota, far western Texas (El Paso County, Hudspeth County, 461 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming 462 # 463 # From Paul Eggert (2018-10-25): 464 # On 1921-03-04 federal law placed all of Texas into the central time zone. 465 # However, El Paso ignored the law for decades and continued to observe 466 # mountain time, on the grounds that that's what they had always done 467 # and they weren't about to let the federal government tell them what to do. 468 # Eventually the federal government gave in and changed the law on 469 # 1970-04-10 to match what El Paso was actually doing. Although 470 # that's slightly after our 1970 cutoff, there is no need to create a 471 # separate zone for El Paso since they were ignoring the law anyway. See: 472 # Long T. El Pasoans were time rebels, fought to stay in Mountain zone. 473 # El Paso Times. 2018-10-24 06:40 -06. 474 # https://www.elpasotimes.com/story/news/local/el-paso/2018/10/24/el-pasoans-were-time-rebels-fought-stay-mountain-zone/1744509002/ 475 # 476 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 477 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D 478 Rule Denver 1920 only - Oct lastSun 2:00 0 S 479 Rule Denver 1921 only - May 22 2:00 0 S 480 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D 481 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S 482 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 483 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 484 -7:00 US M%sT 1920 485 -7:00 Denver M%sT 1942 486 -7:00 US M%sT 1946 487 -7:00 Denver M%sT 1967 488 -7:00 US M%sT 489 490 # US Pacific time, represented by Los Angeles 491 # 492 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, 493 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county 494 # north of the Salmon River, and the towns of Burgdorf and Warren), 495 # Nevada (except West Wendover), Oregon (except the northern ¾ of 496 # Malheur county), and Washington 497 498 # From Paul Eggert (2016-08-20): 499 # In early February 1948, in response to California's electricity shortage, 500 # PG&E changed power frequency from 60 to 59.5 Hz during daylight hours, 501 # causing electric clocks to lose six minutes per day. (This did not change 502 # legal time, and is not part of the data here.) See: 503 # Ross SA. An energy crisis from the past: Northern California in 1948. 504 # Working Paper No. 8, Institute of Governmental Studies, UC Berkeley, 505 # 1973-11. https://escholarship.org/uc/item/8x22k30c 506 # 507 # In another measure to save electricity, DST was instituted from 1948-03-14 508 # at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move 509 # the fallback transition earlier. See pages 3-4 of: 510 # http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf 511 # 512 # In response: 513 # 514 # Governor Warren received a torrent of objecting mail, and it is not too much 515 # to speculate that the objections to Daylight Saving Time were one important 516 # factor in the defeat of the Dewey-Warren Presidential ticket in California. 517 # -- Ross, p 25 518 # 519 # On December 8 the governor exercised the option, setting the date to January 1 520 # (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01). 521 # 522 # Despite the controversy, in 1949 California voters approved Proposition 12, 523 # which established DST from April's last Sunday at 01:00 until September's 524 # last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed 525 # the fall-back date to October's last Sunday. See: 526 # https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props 527 # https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props 528 # 529 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 530 Rule CA 1948 only - Mar 14 2:01 1:00 D 531 Rule CA 1949 only - Jan 1 2:00 0 S 532 Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D 533 Rule CA 1950 1961 - Sep lastSun 2:00 0 S 534 Rule CA 1962 1966 - Oct lastSun 2:00 0 S 535 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 536 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 537 -8:00 US P%sT 1946 538 -8:00 CA P%sT 1967 539 -8:00 US P%sT 540 541 # Alaska 542 # AK%sT is the modern abbreviation for -09 per USNO. 543 # 544 # From Paul Eggert (2017-06-15): 545 # Howse writes that Alaska switched from the Julian to the Gregorian calendar, 546 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. 547 # On Friday, 1867-10-18 (Gregorian), at precisely 15:30 local time, the 548 # Russian forts and fleet at Sitka fired salutes to mark the ceremony of 549 # formal transfer. See the Sacramento Daily Union (1867-11-14), p 3, col 2. 550 # https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SDU18671114.2.12.1 551 # Sitka workers did not change their calendars until Sunday, 1867-10-20, 552 # and so celebrated two Sundays that week. See: Ahllund T (tr Hallamaa P). 553 # From the memoirs of a Finnish workman. Alaska History. 2006 Fall;21(2):1-25. 554 # http://alaskahistoricalsociety.org/wp-content/uploads/2016/12/Ahllund-2006-Memoirs-of-a-Finnish-Workman.pdf 555 # Include only the time zone part of this transition, ignoring the switch 556 # from Julian to Gregorian, since we can't represent the Julian calendar. 557 # 558 # As far as we know, of the locations mentioned below only Sitka was 559 # permanently inhabited in 1867 by anyone using either calendar. 560 # (Yakutat was colonized by the Russians in 1799, but the settlement was 561 # destroyed in 1805 by a Yakutat-kon war party.) Many of Alaska's inhabitants 562 # were unaware of the US acquisition of Alaska, much less of any calendar or 563 # time change. However, the Russian-influenced part of Alaska did observe 564 # Russian time, and it is more accurate to model this than to ignore it. 565 # The database format requires an exact transition time; use the Russian 566 # salute as a somewhat-arbitrary time for the formal transfer of control for 567 # all of Alaska. Sitka's UTC offset is -9:01:13; adjust its 15:30 to the 568 # local times of other Alaskan locations so that they change simultaneously. 569 570 # From Paul Eggert (2014-07-18): 571 # One opinion of the early-1980s turmoil in Alaska over time zones and 572 # daylight saving time appeared as graffiti on a Juneau airport wall: 573 # "Welcome to Juneau. Please turn your watch back to the 19th century." 574 # See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01. 575 # http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html 576 # 577 # Steve Ferguson (2011-01-31) referred to the following source: 578 # Norris F. Keeping time in Alaska: national directives, local response. 579 # Alaska History 2001;16(1-2). 580 # http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/ 581 582 # From Arthur David Olson (2011-02-01): 583 # Here's database-relevant material from the 2001 "Alaska History" article: 584 # 585 # On September 20 [1979]...DOT...officials decreed that on April 27, 586 # 1980, Juneau and other nearby communities would move to Yukon Time. 587 # Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on 588 # Pacific Time. 589 # 590 # ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the 591 # Department's September 1979 decision. Juneau and other communities in 592 # northern Southeast reverted to Pacific Time on October 26. 593 # 594 # On October 28 [1983]...the Metlakatla Indian Community Council voted 595 # unanimously to keep the reservation on Pacific Time. 596 # 597 # According to DOT official Joanne Petrie, Indian reservations are not 598 # bound to follow time zones imposed by neighboring jurisdictions. 599 # 600 # (The last is consistent with how the database now handles the Navajo 601 # Nation.) 602 603 # From Arthur David Olson (2011-02-09): 604 # I just spoke by phone with a staff member at the Metlakatla Indian 605 # Community office (using contact information available at 606 # http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla 607 # It's shortly after 1:00 here on the east coast of the United States; 608 # the staffer said it was shortly after 10:00 there. When I asked whether 609 # that meant they were on Pacific time, they said no - they were on their 610 # own time. I asked about daylight saving; they said it wasn't used. I 611 # did not inquire about practices in the past. 612 613 # From Arthur David Olson (2011-08-17): 614 # For lack of better information, assume that Metlakatla's 615 # abandonment of use of daylight saving resulted from the 1983 vote. 616 617 # From Steffen Thorsen (2015-11-09): 618 # It seems Metlakatla did go off PST on Sunday, November 1, changing 619 # their time to AKST and are going to follow Alaska's DST, switching 620 # between AKST and AKDT from now on.... 621 # https://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/ 622 623 # From Ryan Stanley (2018-11-06): 624 # The Metlakatla community in Alaska has decided not to change its 625 # clock back an hour starting on November 4th, 2018 (day before yesterday). 626 # They will be gmtoff=-28800 year-round. 627 # https://www.facebook.com/141055983004923/photos/pb.141055983004923.-2207520000.1541465673./569081370202380/ 628 629 # From Paul Eggert (2018-12-16): 630 # In a 2018-12-11 special election, Metlakatla voted to go back to 631 # Alaska time (including daylight saving time) starting next year. 632 # https://www.krbd.org/2018/12/12/metlakatla-to-follow-alaska-standard-time-allow-liquor-sales/ 633 # 634 # From Ryan Stanley (2019-01-11): 635 # The community will be changing back on the 20th of this month... 636 # From Tim Parenti (2019-01-11): 637 # Per an announcement on the Metlakatla community's official Facebook page, the 638 # "fall back" will be on Sunday 2019-01-20 at 02:00: 639 # https://www.facebook.com/141055983004923/photos/607150969728753/ 640 # So they won't be waiting for Alaska to join them on 2019-03-10, but will 641 # rather change their clocks twice in seven weeks. 642 643 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 644 Zone America/Juneau 15:02:19 - LMT 1867 Oct 19 15:33:32 645 -8:57:41 - LMT 1900 Aug 20 12:00 646 -8:00 - PST 1942 647 -8:00 US P%sT 1946 648 -8:00 - PST 1969 649 -8:00 US P%sT 1980 Apr 27 2:00 650 -9:00 US Y%sT 1980 Oct 26 2:00 651 -8:00 US P%sT 1983 Oct 30 2:00 652 -9:00 US Y%sT 1983 Nov 30 653 -9:00 US AK%sT 654 Zone America/Sitka 14:58:47 - LMT 1867 Oct 19 15:30 655 -9:01:13 - LMT 1900 Aug 20 12:00 656 -8:00 - PST 1942 657 -8:00 US P%sT 1946 658 -8:00 - PST 1969 659 -8:00 US P%sT 1983 Oct 30 2:00 660 -9:00 US Y%sT 1983 Nov 30 661 -9:00 US AK%sT 662 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 19 15:44:55 663 -8:46:18 - LMT 1900 Aug 20 12:00 664 -8:00 - PST 1942 665 -8:00 US P%sT 1946 666 -8:00 - PST 1969 667 -8:00 US P%sT 1983 Oct 30 2:00 668 -8:00 - PST 2015 Nov 1 2:00 669 -9:00 US AK%sT 2018 Nov 4 2:00 670 -8:00 - PST 2019 Jan 20 2:00 671 -9:00 US AK%sT 672 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 19 15:12:18 673 -9:18:55 - LMT 1900 Aug 20 12:00 674 -9:00 - YST 1942 675 -9:00 US Y%sT 1946 676 -9:00 - YST 1969 677 -9:00 US Y%sT 1983 Nov 30 678 -9:00 US AK%sT 679 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 19 14:31:37 680 -9:59:36 - LMT 1900 Aug 20 12:00 681 -10:00 - AST 1942 682 -10:00 US A%sT 1967 Apr 683 -10:00 - AHST 1969 684 -10:00 US AH%sT 1983 Oct 30 2:00 685 -9:00 US Y%sT 1983 Nov 30 686 -9:00 US AK%sT 687 Zone America/Nome 12:58:22 - LMT 1867 Oct 19 13:29:35 688 -11:01:38 - LMT 1900 Aug 20 12:00 689 -11:00 - NST 1942 690 -11:00 US N%sT 1946 691 -11:00 - NST 1967 Apr 692 -11:00 - BST 1969 693 -11:00 US B%sT 1983 Oct 30 2:00 694 -9:00 US Y%sT 1983 Nov 30 695 -9:00 US AK%sT 696 Zone America/Adak 12:13:22 - LMT 1867 Oct 19 12:44:35 697 -11:46:38 - LMT 1900 Aug 20 12:00 698 -11:00 - NST 1942 699 -11:00 US N%sT 1946 700 -11:00 - NST 1967 Apr 701 -11:00 - BST 1969 702 -11:00 US B%sT 1983 Oct 30 2:00 703 -10:00 US AH%sT 1983 Nov 30 704 -10:00 US H%sT 705 # The following switches don't quite make our 1970 cutoff. 706 # 707 # Shanks writes that part of southwest Alaska (e.g. Aniak) 708 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00, 709 # and another part (e.g. Akiak) made the same switch five weeks later. 710 # 711 # From David Flater (2004-11-09): 712 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska 713 # Historic Preservation Commission, provided this information, which 714 # suggests that Unalaska deviated from statutory time from early 1967 715 # possibly until 1983: 716 # 717 # Minutes of the Unalaska City Council Meeting, January 10, 1967: 718 # "Except for St. Paul and Akutan, Unalaska is the only important 719 # location not on Alaska Standard Time. The following resolution was 720 # made by William Robinson and seconded by Henry Swanson: Be it 721 # resolved that the City of Unalaska hereby goes to Alaska Standard 722 # Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, 723 # January 14, Alaska Standard Time.) This resolution was passed with 724 # three votes for and one against." 725 726 # Hawaii 727 728 # From Arthur David Olson (2010-12-09): 729 # "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225 730 # of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09, 731 # the article is available at 732 # https://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf 733 # and indicates that standard time was adopted effective noon, January 734 # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight 735 # saving for the period between the last Sunday of each April and the 736 # last Sunday of each September, but less than a month later repealed the 737 # act," (page 220), that year-round daylight saving time was in effect 738 # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for 739 # when clocks changed) and that clocks were changed by 30 minutes 740 # effective the second Sunday of June, 1947 (page 219, with no time of 741 # day given for when clocks changed). A footnote for the 1933 changes 742 # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933) 743 # and Act 163 (approved 21 May 1933)." 744 745 # From Arthur David Olson (2011-01-19): 746 # The following is from "Laws of the Territory of Hawaii Passed by the 747 # Seventeenth Legislature: Regular Session 1933," available (as of 748 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act 749 # 90...At 2 o'clock ante meridian of the last Sunday in April of each 750 # year, the standard time of this Territory shall be advanced one 751 # hour...This Act shall take effect upon its approval. Approved this 26th 752 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of 753 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is 754 # hereby repealed...This Act shall take effect upon its approval, upon 755 # which date the standard time of this Territory shall be restored to 756 # that existing immediately prior to the taking effect of said Act 90. 757 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor 758 # of the Territory of Hawaii." 759 # 760 # Note that 1933-05-21 was a Sunday. 761 # We're left to guess the time of day when Act 163 was approved; guess noon. 762 763 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 764 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 765 -10:30 - HST 1933 Apr 30 2:00 766 -10:30 1:00 HDT 1933 May 21 12:00 767 -10:30 US H%sT 1947 Jun 8 2:00 768 -10:00 - HST 769 770 # Now we turn to US areas that have diverged from the consensus since 1970. 771 772 # Arizona mostly uses MST. 773 774 # From Paul Eggert (2002-10-20): 775 # 776 # The information in the rest of this paragraph is derived from the 777 # Daylight Saving Time web page 778 # <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23) 779 # maintained by the Arizona State Library, Archives and Public Records. 780 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard 781 # time, but by federal law railroads, airlines, bus lines, military 782 # personnel, and some engaged in interstate commerce continued to 783 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix 784 # Gazette says that was the date the law changed, and that 04-01 was 785 # the date the state's clocks would change. In 1945 the State of 786 # Arizona used standard time all year, again with exceptions only as 787 # mandated by federal law. Arizona observed DST in 1967, but Arizona 788 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. 789 # 790 # Shanks says the 1944 experiment came to an end on 1944-03-17. 791 # Go with the Arizona State Library instead. 792 793 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 794 Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 795 -7:00 US M%sT 1944 Jan 1 0:01 796 -7:00 - MST 1944 Apr 1 0:01 797 -7:00 US M%sT 1944 Oct 1 0:01 798 -7:00 - MST 1967 799 -7:00 US M%sT 1968 Mar 21 800 -7:00 - MST 801 # From Arthur David Olson (1988-02-13): 802 # A writer from the Inter Tribal Council of Arizona, Inc., 803 # notes in private correspondence dated 1987-12-28 that "Presently, only the 804 # Navajo Nation participates in the Daylight Saving Time policy, due to its 805 # large size and location in three states." (The "only" means that other 806 # tribal nations don't use DST.) 807 # 808 # From Paul Eggert (2013-08-26): 809 # See America/Denver for a zone appropriate for the Navajo Nation. 810 811 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, 812 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, 813 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, 814 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, 815 # Teton, Twin Falls, Valley, Washington counties, and the southern 816 # quarter of Idaho county) and eastern Oregon (most of Malheur County) 817 # switched four weeks late in 1974. 818 # 819 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 820 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 821 -8:00 US P%sT 1923 May 13 2:00 822 -7:00 US M%sT 1974 823 -7:00 - MST 1974 Feb 3 2:00 824 -7:00 US M%sT 825 826 # Indiana 827 # 828 # For a map of Indiana's time zone regions, see: 829 # https://en.wikipedia.org/wiki/Time_in_Indiana 830 # 831 # From Paul Eggert (2018-11-30): 832 # A brief but entertaining history of time in Indiana describes a 1949 debate 833 # in the Indiana House where city legislators (who favored "fast time") 834 # tussled with farm legislators (who didn't) over a bill to outlaw DST: 835 # "Lacking enough votes, the city faction tries to filibuster until time runs 836 # out on the session at midnight, but rural champion Rep. Herbert Copeland, 837 # R-Madison, leans over the gallery railing and forces the official clock 838 # back to 9 p.m., breaking it in the process. The clock sticks on 9 as the 839 # debate rages on into the night. The filibuster finally dies out and the 840 # bill passes, while outside the chamber, clocks read 3:30 a.m. In the end, 841 # it doesn't matter which side won. The law has no enforcement powers and 842 # is simply ignored by fast-time communities." 843 # How Indiana went from 'God's time' to split zones and daylight-saving. 844 # Indianapolis Star. 2018-11-27 14:58 -05. 845 # https://www.indystar.com/story/news/politics/2018/11/27/indianapolis-indiana-time-zone-history-central-eastern-daylight-savings-time/2126300002/ 846 # 847 # From Paul Eggert (2007-08-17): 848 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis, 849 # with the following exceptions: 850 # 851 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, 852 # Vanderburgh, and Warrick counties have been like America/Chicago. 853 # 854 # - Dearborn and Ohio counties have been like America/New_York. 855 # 856 # - Clark, Floyd, and Harrison counties have been like 857 # America/Kentucky/Louisville. 858 # 859 # - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke, 860 # and Switzerland counties have their own time zone histories as noted below. 861 # 862 # Shanks partitioned Indiana into 345 regions, each with its own time history, 863 # and wrote "Even newspaper reports present contradictory information." 864 # Those Hoosiers! Such a flighty and changeable people! 865 # Fortunately, most of the complexity occurred before our cutoff date of 1970. 866 # 867 # Other than Indianapolis, the Indiana place names are so nondescript 868 # that they would be ambiguous if we left them at the 'America' level. 869 # So we reluctantly put them all in a subdirectory 'America/Indiana'. 870 871 # From Paul Eggert (2014-06-26): 872 # https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana 873 # says "DOT is relocating the time zone boundary in Indiana to move Starke, 874 # Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the 875 # Eastern Time Zone to the Central Time Zone.... The effective date of 876 # this rule is 2 a.m. EST Sunday, April 2, 2006, which is the 877 # changeover date from standard time to Daylight Saving Time." 878 # Strictly speaking, this meant the affected counties changed their 879 # clocks twice that night, but this obviously was in error. The intent 880 # was that 01:59:59 EST be followed by 02:00:00 CDT. 881 882 # From Gwillim Law (2007-02-10): 883 # The Associated Press has been reporting that Pulaski County, Indiana is 884 # going to switch from Central to Eastern Time on March 11, 2007.... 885 # http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL 886 887 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 888 Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D 889 Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S 890 Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D 891 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 892 Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 893 -6:00 US C%sT 1920 894 -6:00 Indianapolis C%sT 1942 895 -6:00 US C%sT 1946 896 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 897 -5:00 - EST 1957 Sep 29 2:00 898 -6:00 - CST 1958 Apr 27 2:00 899 -5:00 - EST 1969 900 -5:00 US E%sT 1971 901 -5:00 - EST 2006 902 -5:00 US E%sT 903 # 904 # Eastern Crawford County, Indiana, left its clocks alone in 1974, 905 # as well as from 1976 through 2005. 906 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 907 Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D 908 Rule Marengo 1951 only - Sep lastSun 2:00 0 S 909 Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D 910 Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S 911 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 912 Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 913 -6:00 US C%sT 1951 914 -6:00 Marengo C%sT 1961 Apr 30 2:00 915 -5:00 - EST 1969 916 -5:00 US E%sT 1974 Jan 6 2:00 917 -6:00 1:00 CDT 1974 Oct 27 2:00 918 -5:00 US E%sT 1976 919 -5:00 - EST 2006 920 -5:00 US E%sT 921 # 922 # Daviess, Dubois, Knox, and Martin Counties, Indiana, 923 # switched from eastern to central time in April 2006, then switched back 924 # in November 2007. 925 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 926 Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D 927 Rule Vincennes 1946 only - Sep lastSun 2:00 0 S 928 Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D 929 Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S 930 Rule Vincennes 1955 only - May 1 0:00 1:00 D 931 Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D 932 Rule Vincennes 1960 only - Oct lastSun 2:00 0 S 933 Rule Vincennes 1961 only - Sep lastSun 2:00 0 S 934 Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S 935 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 936 Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53 937 -6:00 US C%sT 1946 938 -6:00 Vincennes C%sT 1964 Apr 26 2:00 939 -5:00 - EST 1969 940 -5:00 US E%sT 1971 941 -5:00 - EST 2006 Apr 2 2:00 942 -6:00 US C%sT 2007 Nov 4 2:00 943 -5:00 US E%sT 944 # 945 # Perry County, Indiana, switched from eastern to central time in April 2006. 946 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 947 Rule Perry 1946 only - Apr lastSun 2:00 1:00 D 948 Rule Perry 1946 only - Sep lastSun 2:00 0 S 949 Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D 950 Rule Perry 1953 1959 - Sep lastSun 2:00 0 S 951 Rule Perry 1955 only - May 1 0:00 1:00 D 952 Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D 953 Rule Perry 1960 only - Oct lastSun 2:00 0 S 954 Rule Perry 1961 only - Sep lastSun 2:00 0 S 955 Rule Perry 1962 1963 - Oct lastSun 2:00 0 S 956 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 957 Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57 958 -6:00 US C%sT 1946 959 -6:00 Perry C%sT 1964 Apr 26 2:00 960 -5:00 - EST 1969 961 -5:00 US E%sT 1971 962 -5:00 - EST 2006 Apr 2 2:00 963 -6:00 US C%sT 964 # 965 # Pike County, Indiana moved from central to eastern time in 1977, 966 # then switched back in 2006, then switched back again in 2007. 967 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 968 Rule Pike 1955 only - May 1 0:00 1:00 D 969 Rule Pike 1955 1960 - Sep lastSun 2:00 0 S 970 Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D 971 Rule Pike 1961 1964 - Oct lastSun 2:00 0 S 972 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 973 Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53 974 -6:00 US C%sT 1955 975 -6:00 Pike C%sT 1965 Apr 25 2:00 976 -5:00 - EST 1966 Oct 30 2:00 977 -6:00 US C%sT 1977 Oct 30 2:00 978 -5:00 - EST 2006 Apr 2 2:00 979 -6:00 US C%sT 2007 Nov 4 2:00 980 -5:00 US E%sT 981 # 982 # Starke County, Indiana moved from central to eastern time in 1991, 983 # then switched back in 2006. 984 # From Arthur David Olson (1991-10-28): 985 # An article on page A3 of the Sunday, 1991-10-27 Washington Post 986 # notes that Starke County switched from Central time to Eastern time as of 987 # 1991-10-27. 988 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 989 Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D 990 Rule Starke 1947 1954 - Sep lastSun 2:00 0 S 991 Rule Starke 1955 1956 - Oct lastSun 2:00 0 S 992 Rule Starke 1957 1958 - Sep lastSun 2:00 0 S 993 Rule Starke 1959 1961 - Oct lastSun 2:00 0 S 994 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 995 Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 996 -6:00 US C%sT 1947 997 -6:00 Starke C%sT 1962 Apr 29 2:00 998 -5:00 - EST 1963 Oct 27 2:00 999 -6:00 US C%sT 1991 Oct 27 2:00 1000 -5:00 - EST 2006 Apr 2 2:00 1001 -6:00 US C%sT 1002 # 1003 # Pulaski County, Indiana, switched from eastern to central time in 1004 # April 2006 and then switched back in March 2007. 1005 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1006 Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D 1007 Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S 1008 Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S 1009 Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S 1010 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1011 Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35 1012 -6:00 US C%sT 1946 1013 -6:00 Pulaski C%sT 1961 Apr 30 2:00 1014 -5:00 - EST 1969 1015 -5:00 US E%sT 1971 1016 -5:00 - EST 2006 Apr 2 2:00 1017 -6:00 US C%sT 2007 Mar 11 2:00 1018 -5:00 US E%sT 1019 # 1020 # Switzerland County, Indiana, did not observe DST from 1973 through 2005. 1021 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1022 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 1023 -6:00 US C%sT 1954 Apr 25 2:00 1024 -5:00 - EST 1969 1025 -5:00 US E%sT 1973 1026 -5:00 - EST 2006 1027 -5:00 US E%sT 1028 1029 # From Paul Eggert (2018-03-20): 1030 # The Louisville & Nashville Railroad's 1883-11-18 change occurred at 1031 # 10:00 old local time; train were supposed to come to a standstill 1032 # for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not 1033 # clear how this matched civil time in Louisville, so for now continue 1034 # to assume Louisville switched at noon new local time, like New York. 1035 # 1036 # Part of Kentucky left its clocks alone in 1974. 1037 # This also includes Clark, Floyd, and Harrison counties in Indiana. 1038 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1039 Rule Louisville 1921 only - May 1 2:00 1:00 D 1040 Rule Louisville 1921 only - Sep 1 2:00 0 S 1041 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D 1042 Rule Louisville 1941 only - Sep lastSun 2:00 0 S 1043 Rule Louisville 1946 only - Jun 2 2:00 0 S 1044 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S 1045 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S 1046 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1047 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 1048 -6:00 US C%sT 1921 1049 -6:00 Louisville C%sT 1942 1050 -6:00 US C%sT 1946 1051 -6:00 Louisville C%sT 1961 Jul 23 2:00 1052 -5:00 - EST 1968 1053 -5:00 US E%sT 1974 Jan 6 2:00 1054 -6:00 1:00 CDT 1974 Oct 27 2:00 1055 -5:00 US E%sT 1056 # 1057 # Wayne County, Kentucky 1058 # 1059 # From Lake Cumberland LIFE 1060 # http://www.lake-cumberland.com/life/archive/news990129time.shtml 1061 # (1999-01-29) via WKYM-101.7: 1062 # Clinton County has joined Wayne County in asking the DoT to change from 1063 # the Central to the Eastern time zone.... The Wayne County government made 1064 # the same request in December. And while Russell County officials have not 1065 # taken action, the majority of respondents to a poll conducted there in 1066 # August indicated they would like to change to "fast time" also. 1067 # The three Lake Cumberland counties are the farthest east of any U.S. 1068 # location in the Central time zone. 1069 # 1070 # From Rich Wales (2000-08-29): 1071 # After prolonged debate, and despite continuing deep differences of opinion, 1072 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern 1073 # (-0500) time. They won't "fall back" this year. See Sara Shipley, 1074 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). 1075 # 1076 # From Paul Eggert (2001-07-16): 1077 # The final rule was published in the 1078 # Federal Register 65, 160 (2000-08-17), pp 50154-50158. 1079 # https://www.gpo.gov/fdsys/pkg/FR-2000-08-17/html/00-20854.htm 1080 # 1081 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 1082 -6:00 US C%sT 1946 1083 -6:00 - CST 1968 1084 -6:00 US C%sT 2000 Oct 29 2:00 1085 -5:00 US E%sT 1086 1087 1088 # From Rives McDow (2000-08-30): 1089 # Here ... are all the changes in the US since 1985. 1090 # Kearny County, KS (put all of county on central; 1091 # previously split between MST and CST) ... 1990-10 1092 # Starke County, IN (from CST to EST) ... 1991-10 1093 # Oliver County, ND (from MST to CST) ... 1992-10 1094 # West Wendover, NV (from PST TO MST) ... 1999-10 1095 # Wayne County, KY (from CST to EST) ... 2000-10 1096 # 1097 # From Paul Eggert (2001-07-17): 1098 # We don't know where the line used to be within Kearny County, KS, 1099 # so omit that change for now. 1100 # See America/Indiana/Knox for the Starke County, IN change. 1101 # See America/North_Dakota/Center for the Oliver County, ND change. 1102 # West Wendover, NV officially switched from Pacific to mountain time on 1103 # 1999-10-31. See the 1104 # Federal Register 64, 203 (1999-10-21), pp 56705-56707. 1105 # https://www.gpo.gov/fdsys/pkg/FR-1999-10-21/html/99-27240.htm 1106 # However, the Federal Register says that West Wendover already operated 1107 # on mountain time, and the rule merely made this official; 1108 # hence a separate tz entry is not needed. 1109 1110 # Michigan 1111 # 1112 # From Bob Devine (1988-01-28): 1113 # Michigan didn't observe DST from 1968 to 1973. 1114 # 1115 # From Paul Eggert (1999-03-31): 1116 # Shanks writes that Michigan started using standard time on 1885-09-18, 1117 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) 1118 # that Detroit kept 1119 # 1120 # local time until 1900 when the City Council decreed that clocks should 1121 # be put back twenty-eight minutes to Central Standard Time. Half the 1122 # city obeyed, half refused. After considerable debate, the decision 1123 # was rescinded and the city reverted to Sun time. A derisive offer to 1124 # erect a sundial in front of the city hall was referred to the 1125 # Committee on Sewers. Then, in 1905, Central time was adopted 1126 # by city vote. 1127 # 1128 # This story is too entertaining to be false, so go with Howse over Shanks. 1129 # 1130 # From Paul Eggert (2001-03-06): 1131 # Garland (1927) writes "Cleveland and Detroit advanced their clocks 1132 # one hour in 1914." This change is not in Shanks. We have no more 1133 # info, so omit this for now. 1134 # 1135 # From Paul Eggert (2017-07-26): 1136 # Although Shanks says Detroit observed DST in 1967 from 06-14 00:01 1137 # until 10-29 00:01, I now see multiple reports that this is incorrect. 1138 # For example, according to a 50-year anniversary report about the 1967 1139 # Detroit riots and a major-league doubleheader on 1967-07-23, "By the time 1140 # the last fly ball of the doubleheader settled into the glove of leftfielder 1141 # Lenny Green, it was after 7 p.m. Detroit did not observe daylight saving 1142 # time, so light was already starting to fail. Twilight was made even deeper 1143 # by billowing columns of smoke that ascended in an unbroken wall north of the 1144 # ballpark." See: Dow B. Detroit '67: As violence unfolded, Tigers played two 1145 # at home vs. Yankees. Detroit Free Press 2017-07-23. 1146 # https://www.freep.com/story/sports/mlb/tigers/2017/07/23/detroit-tigers-1967-riot-new-york-yankees/499951001/ 1147 # 1148 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975. 1149 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1150 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D 1151 Rule Detroit 1948 only - Sep lastSun 2:00 0 S 1152 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1153 Zone America/Detroit -5:32:11 - LMT 1905 1154 -6:00 - CST 1915 May 15 2:00 1155 -5:00 - EST 1942 1156 -5:00 US E%sT 1946 1157 -5:00 Detroit E%sT 1973 1158 -5:00 US E%sT 1975 1159 -5:00 - EST 1975 Apr 27 2:00 1160 -5:00 US E%sT 1161 # 1162 # Dickinson, Gogebic, Iron, and Menominee Counties, Michigan, 1163 # switched from EST to CST/CDT in 1973. 1164 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER 1165 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D 1166 Rule Menominee 1946 only - Sep lastSun 2:00 0 S 1167 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D 1168 Rule Menominee 1966 only - Oct lastSun 2:00 0 S 1169 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1170 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 1171 -6:00 US C%sT 1946 1172 -6:00 Menominee C%sT 1969 Apr 27 2:00 1173 -5:00 - EST 1973 Apr 29 2:00 1174 -6:00 US C%sT 1175 1176 # Navassa 1177 # administered by the US Fish and Wildlife Service 1178 # claimed by US under the provisions of the 1856 Guano Islands Act 1179 # also claimed by Haiti 1180 # occupied 1857/1900 by the Navassa Phosphate Co 1181 # US lighthouse 1917/1996-09 1182 # currently uninhabited 1183 # see Mark Fineman, "An Isle Rich in Guano and Discord", 1184 # _Los Angeles Times_ (1998-11-10), A1, A10; it cites 1185 # Jimmy Skaggs, _The Great Guano Rush_ (1994). 1186 1187 ################################################################################ 1188 1189 1190 # From Paul Eggert (2017-02-10): 1191 # 1192 # Unless otherwise specified, the source for data through 1990 is: 1193 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 1194 # San Diego: ACS Publications, Inc. (2003). 1195 # Unfortunately this book contains many errors and cites no sources. 1196 # 1197 # Many years ago Gwillim Law wrote that a good source 1198 # for time zone data was the International Air Transport 1199 # Association's Standard Schedules Information Manual (IATA SSIM), 1200 # published semiannually. Law sent in several helpful summaries 1201 # of the IATA's data after 1990. Except where otherwise noted, 1202 # IATA SSIM is the source for entries after 1990. 1203 # 1204 # Other sources occasionally used include: 1205 # 1206 # Edward W. Whitman, World Time Differences, 1207 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), 1208 # which I found in the UCLA library. 1209 # 1210 # William Willett, The Waste of Daylight, 19th edition 1211 # <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf> 1212 # [PDF] (1914-03) 1213 # 1214 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94 1215 # <https://www.jstor.org/stable/1774359>. 1216 # 1217 # See the 'europe' file for Greenland. 1218 1219 # Canada 1220 1221 # From Alain LaBonté (1994-11-14): 1222 # I post here the time zone abbreviations standardized in Canada 1223 # for both English and French in the CAN/CSA-Z234.4-89 standard.... 1224 # 1225 # UTC Standard time Daylight saving time 1226 # offset French English French English 1227 # -2:30 - - HAT NDT 1228 # -3 - - HAA ADT 1229 # -3:30 HNT NST - - 1230 # -4 HNA AST HAE EDT 1231 # -5 HNE EST HAC CDT 1232 # -6 HNC CST HAR MDT 1233 # -7 HNR MST HAP PDT 1234 # -8 HNP PST HAY YDT 1235 # -9 HNY YST - - 1236 # 1237 # HN: Heure Normale ST: Standard Time 1238 # HA: Heure Avancée DT: Daylight saving Time 1239 # 1240 # A: de l'Atlantique Atlantic 1241 # C: du Centre Central 1242 # E: de l'Est Eastern 1243 # M: Mountain 1244 # N: Newfoundland 1245 # P: du Pacifique Pacific 1246 # R: des Rocheuses 1247 # T: de Terre-Neuve 1248 # Y: du Yukon Yukon 1249 # 1250 # From Paul Eggert (1994-11-22): 1251 # Alas, this sort of thing must be handled by localization software. 1252 1253 # Unless otherwise specified, the data entries for Canada are all from Shanks 1254 # & Pottenger. 1255 1256 # From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31, 1257 # 2007-03-01): 1258 # The British Columbia government announced yesterday that it will 1259 # adjust daylight savings next year to align with changes in the 1260 # U.S. and the rest of Canada.... 1261 # https://archive.news.gov.bc.ca/releases/news_releases_2005-2009/2006AG0014-000330.htm 1262 # ... 1263 # Nova Scotia 1264 # Daylight saving time will be extended by four weeks starting in 2007.... 1265 # https://www.novascotia.ca/just/regulations/rg2/2006/ma1206.pdf 1266 # 1267 # [For New Brunswick] the new legislation dictates that the time change is to 1268 # be done at 02:00 instead of 00:01. 1269 # https://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf 1270 # ... 1271 # Manitoba has traditionally changed the clock every fall at 03:00. 1272 # As of 2006, the transition is to take place one hour earlier at 02:00. 1273 # https://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php 1274 # ... 1275 # [Alberta, Ontario, Quebec] will follow US rules. 1276 # http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM 1277 # http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm 1278 # http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF 1279 # ... 1280 # P.E.I. will follow US rules.... 1281 # http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf 1282 # ... 1283 # Province of Newfoundland and Labrador.... 1284 # http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm 1285 # ... 1286 # Yukon 1287 # https://www.gov.yk.ca/legislation/regs/oic2006_127.pdf 1288 # ... 1289 # N.W.T. will follow US rules. Whoever maintains the government web site 1290 # does not seem to believe in bookmarks. To see the news release, click the 1291 # following link and search for "Daylight Savings Time Change". Press the 1292 # "Daylight Savings Time Change" link; it will fire off a popup using 1293 # JavaScript. 1294 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive 1295 # ... 1296 # Nunavut 1297 # An amendment to the Interpretation Act was registered on February 19/2007.... 1298 # http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf 1299 1300 # From Paul Eggert (2014-10-18): 1301 # H. David Matthews and Mary Vincent's map 1302 # "It's about TIME", _Canadian Geographic_ (September-October 1998) 1303 # http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp 1304 # contains detailed boundaries for regions observing nonstandard 1305 # time and daylight saving time arrangements in Canada circa 1998. 1306 # 1307 # National Research Council Canada maintains info about time zones and DST. 1308 # https://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html 1309 # https://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5 1310 # Its unofficial information is often taken from Matthews and Vincent. 1311 1312 # From Paul Eggert (2006-06-27): 1313 # For now, assume all of DST-observing Canada will fall into line with the 1314 # new US DST rules, 1315 1316 # From Chris Walton (2011-12-01) 1317 # In the first of Tammy Hardwick's articles 1318 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260 1319 # she quotes the Friday November 1/1918 edition of the Creston Review. 1320 # The quote includes these two statements: 1321 # 'Sunday the CPR went back to the old system of time...' 1322 # '... The daylight saving scheme was dropped all over Canada at the same time,' 1323 # These statements refer to a transition from daylight time to standard time 1324 # that occurred nationally on Sunday October 27/1918. This transition was 1325 # also documented in the Saturday October 26/1918 edition of the Toronto Star. 1326 1327 # In light of that evidence, we alter the date from the earlier believed 1328 # Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day 1329 # than Thursday) in all Canadian rulesets. 1330 1331 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1332 Rule Canada 1918 only - Apr 14 2:00 1:00 D 1333 Rule Canada 1918 only - Oct 27 2:00 0 S 1334 Rule Canada 1942 only - Feb 9 2:00 1:00 W # War 1335 Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace 1336 Rule Canada 1945 only - Sep 30 2:00 0 S 1337 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D 1338 Rule Canada 1974 2006 - Oct lastSun 2:00 0 S 1339 Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D 1340 Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D 1341 Rule Canada 2007 max - Nov Sun>=1 2:00 0 S 1342 1343 1344 # Newfoundland and Labrador 1345 1346 # From Paul Eggert (2017-10-14): 1347 # Legally Labrador should observe Newfoundland time; see: 1348 # McLeod J. Labrador time - legal or not? St. John's Telegram, 2017-10-07 1349 # http://www.thetelegram.com/news/local/labrador-time--legal-or-not-154860/ 1350 # Matthews and Vincent (1998) write that the only part of Labrador 1351 # that follows the rules is the southeast corner, including Port Hope 1352 # Simpson and Mary's Harbour, but excluding, say, Black Tickle. 1353 1354 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1355 Rule StJohns 1917 only - Apr 8 2:00 1:00 D 1356 Rule StJohns 1917 only - Sep 17 2:00 0 S 1357 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger. 1358 Rule StJohns 1919 only - May 5 23:00 1:00 D 1359 Rule StJohns 1919 only - Aug 12 23:00 0 S 1360 # For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger. 1361 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D 1362 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S 1363 # For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks & 1364 # Pottenger. 1365 Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D 1366 Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S 1367 # Whitman gives the following transitions: 1368 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 1369 # but go with Shanks & Pottenger and assume they used Canadian rules. 1370 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives 1371 # Apr 30 - Sep 24; go with Shanks & Pottenger. 1372 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D 1373 Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S 1374 Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D 1375 Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S 1376 Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S 1377 # From Paul Eggert (2000-10-02): 1378 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches 1379 # at 00:01 local time. For now, assume it started in 1987. 1380 1381 # From Michael Pelley (2011-09-12): 1382 # We received today, Monday, September 12, 2011, notification that the 1383 # changes to the Newfoundland Standard Time Act have been proclaimed. 1384 # The change in the Act stipulates that the change from Daylight Savings 1385 # Time to Standard Time and from Standard Time to Daylight Savings Time 1386 # now occurs at 2:00AM. 1387 # ... 1388 # http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm 1389 # ... 1390 # MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery 1391 # Office of the Chief Information Officer 1392 # Executive Council 1393 # Government of Newfoundland & Labrador 1394 1395 Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D 1396 Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S 1397 Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD 1398 Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D 1399 Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D 1400 Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S 1401 # 1402 # St John's has an apostrophe, but Posix file names can't have apostrophes. 1403 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1404 Zone America/St_Johns -3:30:52 - LMT 1884 1405 -3:30:52 StJohns N%sT 1918 1406 -3:30:52 Canada N%sT 1919 1407 -3:30:52 StJohns N%sT 1935 Mar 30 1408 -3:30 StJohns N%sT 1942 May 11 1409 -3:30 Canada N%sT 1946 1410 -3:30 StJohns N%sT 2011 Nov 1411 -3:30 Canada N%sT 1412 1413 # most of east Labrador 1414 1415 # The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'. 1416 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1417 Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay 1418 -3:30:52 - NST 1918 1419 -3:30:52 Canada N%sT 1919 1420 -3:30:52 - NST 1935 Mar 30 1421 -3:30 - NST 1936 1422 -3:30 StJohns N%sT 1942 May 11 1423 -3:30 Canada N%sT 1946 1424 -3:30 StJohns N%sT 1966 Mar 15 2:00 1425 -4:00 StJohns A%sT 2011 Nov 1426 -4:00 Canada A%sT 1427 1428 1429 # west Labrador, Nova Scotia, Prince Edward I 1430 1431 # From Brian Inglis (2015-07-20): 1432 # From the historical weather station records available at: 1433 # https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada 1434 # Sydney shares the same time history as Glace Bay, so was 1435 # likely to be the same across the island.... 1436 # Sydney, as the capital and most populous location, or Cape Breton, would 1437 # have been better names for the zone had we known this in 1996. 1438 1439 # From Paul Eggert (2015-07-20): 1440 # Shanks & Pottenger write that since 1970 most of this region has been like 1441 # Halifax. Many locales did not observe peacetime DST until 1972; 1442 # the Cape Breton area, represented by Glace Bay, is the largest we know of 1443 # (Glace Bay was perhaps not the best name choice but no point changing now). 1444 # Shanks & Pottenger also write that Liverpool, NS was the only town 1445 # in Canada to observe DST in 1971 but not 1970; for now we'll assume 1446 # this is a typo. 1447 1448 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1449 Rule Halifax 1916 only - Apr 1 0:00 1:00 D 1450 Rule Halifax 1916 only - Oct 1 0:00 0 S 1451 Rule Halifax 1920 only - May 9 0:00 1:00 D 1452 Rule Halifax 1920 only - Aug 29 0:00 0 S 1453 Rule Halifax 1921 only - May 6 0:00 1:00 D 1454 Rule Halifax 1921 1922 - Sep 5 0:00 0 S 1455 Rule Halifax 1922 only - Apr 30 0:00 1:00 D 1456 Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D 1457 Rule Halifax 1923 only - Sep 4 0:00 0 S 1458 Rule Halifax 1924 only - Sep 15 0:00 0 S 1459 Rule Halifax 1925 only - Sep 28 0:00 0 S 1460 Rule Halifax 1926 only - May 16 0:00 1:00 D 1461 Rule Halifax 1926 only - Sep 13 0:00 0 S 1462 Rule Halifax 1927 only - May 1 0:00 1:00 D 1463 Rule Halifax 1927 only - Sep 26 0:00 0 S 1464 Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D 1465 Rule Halifax 1928 only - Sep 9 0:00 0 S 1466 Rule Halifax 1929 only - Sep 3 0:00 0 S 1467 Rule Halifax 1930 only - Sep 15 0:00 0 S 1468 Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S 1469 Rule Halifax 1932 only - May 1 0:00 1:00 D 1470 Rule Halifax 1933 only - Apr 30 0:00 1:00 D 1471 Rule Halifax 1933 only - Oct 2 0:00 0 S 1472 Rule Halifax 1934 only - May 20 0:00 1:00 D 1473 Rule Halifax 1934 only - Sep 16 0:00 0 S 1474 Rule Halifax 1935 only - Jun 2 0:00 1:00 D 1475 Rule Halifax 1935 only - Sep 30 0:00 0 S 1476 Rule Halifax 1936 only - Jun 1 0:00 1:00 D 1477 Rule Halifax 1936 only - Sep 14 0:00 0 S 1478 Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D 1479 Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S 1480 Rule Halifax 1939 only - May 28 0:00 1:00 D 1481 Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D 1482 Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D 1483 Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S 1484 Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D 1485 Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S 1486 Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D 1487 Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S 1488 Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D 1489 Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S 1490 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1491 Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 1492 -4:00 Halifax A%sT 1918 1493 -4:00 Canada A%sT 1919 1494 -4:00 Halifax A%sT 1942 Feb 9 2:00s 1495 -4:00 Canada A%sT 1946 1496 -4:00 Halifax A%sT 1974 1497 -4:00 Canada A%sT 1498 Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 1499 -4:00 Canada A%sT 1953 1500 -4:00 Halifax A%sT 1954 1501 -4:00 - AST 1972 1502 -4:00 Halifax A%sT 1974 1503 -4:00 Canada A%sT 1504 1505 # New Brunswick 1506 1507 # From Paul Eggert (2007-01-31): 1508 # The Time Definition Act <http://www.gnb.ca/0062/PDF-acts/t-06.pdf> 1509 # says they changed at 00:01 through 2006, and 1510 # <http://www.canlii.org/nb/laws/sta/t-6/20030127/whole.html> makes it 1511 # clear that this was the case since at least 1993. 1512 # For now, assume it started in 1993. 1513 1514 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1515 Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D 1516 Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S 1517 Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D 1518 Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S 1519 Rule Moncton 1939 only - May 27 1:00 1:00 D 1520 Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S 1521 Rule Moncton 1940 only - May 19 1:00 1:00 D 1522 Rule Moncton 1941 only - May 4 1:00 1:00 D 1523 Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D 1524 Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S 1525 Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S 1526 Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D 1527 Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S 1528 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1529 Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 1530 -5:00 - EST 1902 Jun 15 1531 -4:00 Canada A%sT 1933 1532 -4:00 Moncton A%sT 1942 1533 -4:00 Canada A%sT 1946 1534 -4:00 Moncton A%sT 1973 1535 -4:00 Canada A%sT 1993 1536 -4:00 Moncton A%sT 2007 1537 -4:00 Canada A%sT 1538 1539 # Quebec 1540 1541 # From Paul Eggert (2015-03-24): 1542 # See America/Toronto for most of Quebec, including Montreal. 1543 # 1544 # Matthews and Vincent (1998) also write that Quebec east of the -63 1545 # meridian is supposed to observe AST, but residents as far east as 1546 # Natashquan use EST/EDT, and residents east of Natashquan use AST. 1547 # The Quebec department of justice writes in 1548 # "The situation in Minganie and Basse-Côte-Nord" 1549 # http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm 1550 # that the coastal strip from just east of Natashquan to Blanc-Sablon 1551 # observes Atlantic standard time all year round. 1552 # https://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en 1553 # says this common practice was codified into law as of 2007. 1554 # For lack of better info, guess this practice began around 1970, contra to 1555 # Shanks & Pottenger who have this region observing AST/ADT. 1556 1557 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1558 Zone America/Blanc-Sablon -3:48:28 - LMT 1884 1559 -4:00 Canada A%sT 1970 1560 -4:00 - AST 1561 1562 # Ontario 1563 1564 # From Paul Eggert (2006-07-09): 1565 # Shanks & Pottenger write that since 1970 most of Ontario has been like 1566 # Toronto. 1567 # Thunder Bay skipped DST in 1973. 1568 # Many smaller locales did not observe peacetime DST until 1974; 1569 # Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1570 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax. 1571 1572 # From Mark Brader (2003-07-26): 1573 # [According to the Toronto Star] Orillia, Ontario, adopted DST 1574 # effective Saturday, 1912-06-22, 22:00; the article mentions that 1575 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw 1576 # have already done so. In Orillia DST was to run until Saturday, 1577 # 1912-08-31 (no time mentioned), but it was met with considerable 1578 # hostility from certain segments of the public, and was revoked after 1579 # only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but 1580 # presumably that should be -07-06. (1912-06-19, -07-12; also letters 1581 # earlier in June). 1582 # 1583 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). 1584 # 1585 # From Paul Eggert (2017-07-08): 1586 # For more on Orillia, see: Daubs K. Bold attempt at daylight saving 1587 # time became a comic failure in Orillia. Toronto Star 2017-07-08. 1588 # https://www.thestar.com/news/insight/2017/07/08/bold-attempt-at-daylight-saving-time-became-a-comic-failure-in-orillia.html 1589 1590 # From Paul Eggert (1997-10-17): 1591 # Mark Brader writes that an article in the 1997-10-14 Toronto Star 1592 # says that Atikokan, Ontario currently does not observe DST, 1593 # but will vote on 11-10 whether to use EST/EDT. 1594 # He also writes that the Ontario Time Act (1990, Chapter T.9) 1595 # http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html 1596 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. 1597 # Officially Atikokan is therefore on CST/CDT, and most likely this report 1598 # concerns a non-official time observed as a matter of local practice. 1599 # 1600 # From Paul Eggert (2000-10-02): 1601 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and 1602 # New Osnaburgh observe CST all year, that Big Trout Lake observes 1603 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in 1604 # violation of the official Ontario rules. 1605 # 1606 # From Paul Eggert (2006-07-09): 1607 # Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the 1608 # 2005-07-21 Chronicle-Journal, which said: 1609 # 1610 # The clocks in Atikokan stay set on standard time year-round. 1611 # This means they spend about half the time on central time and 1612 # the other half on eastern time. 1613 # 1614 # For the most part, the system works, Mayor Dennis Brown said. 1615 # 1616 # "The majority of businesses in Atikokan deal more with Eastern 1617 # Canada, but there are some that deal with Western Canada," he 1618 # said. "I don't see any changes happening here." 1619 # 1620 # Walton also writes "Supposedly Pickle Lake and Mishkeegogamang 1621 # [New Osnaburgh] follow the same practice." 1622 1623 # From Garry McKinnon (2006-07-14) via Chris Walton: 1624 # I chatted with a member of my board who has an outstanding memory 1625 # and a long history in Atikokan (and in the telecom industry) and he 1626 # can say for certain that Atikokan has been practicing the current 1627 # time keeping since 1952, at least. 1628 1629 # From Paul Eggert (2006-07-17): 1630 # Shanks & Pottenger say that Atikokan has agreed with Rainy River 1631 # ever since standard time was introduced, but the information from 1632 # McKinnon sounds more authoritative. For now, assume that Atikokan 1633 # switched to EST immediately after WWII era daylight saving time 1634 # ended. This matches the old (less-populous) America/Coral_Harbour 1635 # entry since our cutoff date of 1970, so we can move 1636 # America/Coral_Harbour to the 'backward' file. 1637 1638 # From Mark Brader (2010-03-06): 1639 # 1640 # Currently the database has: 1641 # 1642 # # Ontario 1643 # 1644 # # From Paul Eggert (2006-07-09): 1645 # # Shanks & Pottenger write that since 1970 most of Ontario has been like 1646 # # Toronto. 1647 # # Thunder Bay skipped DST in 1973. 1648 # # Many smaller locales did not observe peacetime DST until 1974; 1649 # # Nipigon (EST) and Rainy River (CST) are the largest that we know of. 1650 # 1651 # In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom 1652 # right corner of page 1, it says that Toronto will return to standard 1653 # time at 2 am Sunday morning (which agrees with the database), and that: 1654 # 1655 # The one-hour setback will go into effect throughout most of Ontario, 1656 # except in areas like Windsor which remains on standard time all year. 1657 # 1658 # Windsor is, of course, a lot larger than Nipigon. 1659 # 1660 # I only came across this incidentally. I don't know if Windsor began 1661 # observing DST when Detroit did, or in 1974, or on some other date. 1662 # 1663 # By the way, the article continues by noting that: 1664 # 1665 # Some cities in the United States have pushed the deadline back 1666 # three weeks and will change over from daylight saving in October. 1667 1668 # From Arthur David Olson (2010-07-17): 1669 # 1670 # "Standard Time and Time Zones in Canada" appeared in 1671 # The Journal of The Royal Astronomical Society of Canada, 1672 # volume 26, number 2 (February 1932) and, as of 2010-07-17, 1673 # was available at 1674 # http://adsabs.harvard.edu/full/1932JRASC..26...49S 1675 # 1676 # It includes the text below (starting on page 57): 1677 # 1678 # A list of the places in Canada using daylight saving time would 1679 # require yearly revision. From information kindly furnished by 1680 # the provincial governments and by the postmasters in many cities 1681 # and towns, it is found that the following places used daylight sav- 1682 # ing in 1930. The information for the province of Quebec is definite, 1683 # for the other provinces only approximate: 1684 # 1685 # Province Daylight saving time used 1686 # Prince Edward Island Not used. 1687 # Nova Scotia In Halifax only. 1688 # New Brunswick In St. John only. 1689 # Quebec In the following places: 1690 # Montreal Lachine 1691 # Quebec Mont-Royal 1692 # Lévis Iberville 1693 # St. Lambert Cap de la Madelèine 1694 # Verdun Loretteville 1695 # Westmount Richmond 1696 # Outremont St. Jérôme 1697 # Longueuil Greenfield Park 1698 # Arvida Waterloo 1699 # Chambly-Canton Beaulieu 1700 # Melbourne La Tuque 1701 # St. Théophile Buckingham 1702 # Ontario Used generally in the cities and towns along 1703 # the southerly part of the province. Not 1704 # used in the northwesterly part. 1705 # Manitoba Not used. 1706 # Saskatchewan In Regina only. 1707 # Alberta Not used. 1708 # British Columbia Not used. 1709 # 1710 # With some exceptions, the use of daylight saving may be said to be limited 1711 # to those cities and towns lying between Quebec city and Windsor, Ont. 1712 1713 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1714 Rule Toronto 1919 only - Mar 30 23:30 1:00 D 1715 Rule Toronto 1919 only - Oct 26 0:00 0 S 1716 Rule Toronto 1920 only - May 2 2:00 1:00 D 1717 Rule Toronto 1920 only - Sep 26 0:00 0 S 1718 Rule Toronto 1921 only - May 15 2:00 1:00 D 1719 Rule Toronto 1921 only - Sep 15 2:00 0 S 1720 Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D 1721 # Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16" 1722 # was meant. 1723 Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S 1724 Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D 1725 # The 1927-to-1939 rules can be expressed more simply as 1726 # Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S 1727 # Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D 1728 # Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D 1729 # Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S 1730 # The rules below avoid use of Sun>=25 1731 # (which pre-2004 versions of zic cannot handle). 1732 Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S 1733 Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D 1734 Rule Toronto 1932 only - May 1 2:00 1:00 D 1735 Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D 1736 Rule Toronto 1933 only - Oct 1 2:00 0 S 1737 Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S 1738 Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S 1739 Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D 1740 Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D 1741 Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S 1742 Rule Toronto 1949 only - Nov lastSun 0:00 0 S 1743 Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D 1744 Rule Toronto 1950 only - Nov lastSun 2:00 0 S 1745 Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S 1746 # Shanks & Pottenger say Toronto ended DST a week early in 1971, 1747 # namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this 1748 # is wrong, and that he had confirmed it by checking the 1971-10-30 1749 # Toronto Star, which said that DST was ending 1971-10-31 as usual. 1750 Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S 1751 1752 # From Paul Eggert (2003-07-27): 1753 # Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and 1754 # Port Arthur, Ontario, the principle of the Bill has been in 1755 # operation for the past three years, and in the City of Moose Jaw, 1756 # Saskatchewan, for one year." 1757 1758 # From David Bryan via Tory Tronrud, Director/Curator, 1759 # Thunder Bay Museum (2003-11-12): 1760 # There is some suggestion, however, that, by-law or not, daylight 1761 # savings time was being practiced in Fort William and Port Arthur 1762 # before 1909.... [I]n 1910, the line between the Eastern and Central 1763 # Time Zones was permanently moved about two hundred miles west to 1764 # include the Thunder Bay area.... When Canada adopted daylight 1765 # savings time in 1916, Fort William and Port Arthur, having done so 1766 # already, did not change their clocks.... During the Second World 1767 # War,... [t]he cities agreed to implement DST during the summer 1768 # months for the remainder of the war years. 1769 1770 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1771 Zone America/Toronto -5:17:32 - LMT 1895 1772 -5:00 Canada E%sT 1919 1773 -5:00 Toronto E%sT 1942 Feb 9 2:00s 1774 -5:00 Canada E%sT 1946 1775 -5:00 Toronto E%sT 1974 1776 -5:00 Canada E%sT 1777 Zone America/Thunder_Bay -5:57:00 - LMT 1895 1778 -6:00 - CST 1910 1779 -5:00 - EST 1942 1780 -5:00 Canada E%sT 1970 1781 -5:00 Toronto E%sT 1973 1782 -5:00 - EST 1974 1783 -5:00 Canada E%sT 1784 Zone America/Nipigon -5:53:04 - LMT 1895 1785 -5:00 Canada E%sT 1940 Sep 29 1786 -5:00 1:00 EDT 1942 Feb 9 2:00s 1787 -5:00 Canada E%sT 1788 Zone America/Rainy_River -6:18:16 - LMT 1895 1789 -6:00 Canada C%sT 1940 Sep 29 1790 -6:00 1:00 CDT 1942 Feb 9 2:00s 1791 -6:00 Canada C%sT 1792 Zone America/Atikokan -6:06:28 - LMT 1895 1793 -6:00 Canada C%sT 1940 Sep 29 1794 -6:00 1:00 CDT 1942 Feb 9 2:00s 1795 -6:00 Canada C%sT 1945 Sep 30 2:00 1796 -5:00 - EST 1797 1798 1799 # Manitoba 1800 1801 # From Rob Douglas (2006-04-06): 1802 # the old Manitoba Time Act - as amended by Bill 2, assented to 1803 # March 27, 1987 ... said ... 1804 # "between two o'clock Central Standard Time in the morning of 1805 # the first Sunday of April of each year and two o'clock Central 1806 # Standard Time in the morning of the last Sunday of October next 1807 # following, one hour in advance of Central Standard Time."... 1808 # I believe that the English legislation [of the old time act] had 1809 # been assented to (March 22, 1967).... 1810 # Also, as far as I can tell, there was no order-in-council varying 1811 # the time of Daylight Saving Time for 2005 and so the provisions of 1812 # the 1987 version would apply - the changeover was at 2:00 Central 1813 # Standard Time (i.e. not until 3:00 Central Daylight Time). 1814 1815 # From Paul Eggert (2006-04-10): 1816 # Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s) 1817 # starting 1966. Since 02:00s is clearly correct for 1967 on, assume 1818 # it was also 02:00s in 1966. 1819 1820 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1821 Rule Winn 1916 only - Apr 23 0:00 1:00 D 1822 Rule Winn 1916 only - Sep 17 0:00 0 S 1823 Rule Winn 1918 only - Apr 14 2:00 1:00 D 1824 Rule Winn 1918 only - Oct 27 2:00 0 S 1825 Rule Winn 1937 only - May 16 2:00 1:00 D 1826 Rule Winn 1937 only - Sep 26 2:00 0 S 1827 Rule Winn 1942 only - Feb 9 2:00 1:00 W # War 1828 Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace 1829 Rule Winn 1945 only - Sep lastSun 2:00 0 S 1830 Rule Winn 1946 only - May 12 2:00 1:00 D 1831 Rule Winn 1946 only - Oct 13 2:00 0 S 1832 Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D 1833 Rule Winn 1947 1949 - Sep lastSun 2:00 0 S 1834 Rule Winn 1950 only - May 1 2:00 1:00 D 1835 Rule Winn 1950 only - Sep 30 2:00 0 S 1836 Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D 1837 Rule Winn 1951 1958 - Sep lastSun 2:00 0 S 1838 Rule Winn 1959 only - Oct lastSun 2:00 0 S 1839 Rule Winn 1960 only - Sep lastSun 2:00 0 S 1840 Rule Winn 1963 only - Apr lastSun 2:00 1:00 D 1841 Rule Winn 1963 only - Sep 22 2:00 0 S 1842 Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D 1843 Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S 1844 Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D 1845 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1846 Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 1847 -6:00 Winn C%sT 2006 1848 -6:00 Canada C%sT 1849 1850 1851 # Saskatchewan 1852 1853 # From Mark Brader (2003-07-26): 1854 # The first actual adoption of DST in Canada was at the municipal 1855 # level. As the [Toronto] Star put it (1912-06-07), "While people 1856 # elsewhere have long been talking of legislation to save daylight, 1857 # the city of Moose Jaw [Saskatchewan] has acted on its own hook." 1858 # DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: 1859 # presumably late evening, as below), and would run until "the end of 1860 # the summer". The discrepancy between municipal time and railroad 1861 # time was noted. 1862 1863 # From Paul Eggert (2003-07-27): 1864 # Willett (1914-03) notes that DST "has been in operation ... in the 1865 # City of Moose Jaw, Saskatchewan, for one year." 1866 1867 # From Paul Eggert (2006-03-22): 1868 # Shanks & Pottenger say that since 1970 this region has mostly been as Regina. 1869 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. 1870 # Other western towns (e.g. Lloydminster) are like Edmonton. 1871 # Matthews and Vincent (1998) write that Denare Beach and Creighton 1872 # are like Winnipeg, in violation of Saskatchewan law. 1873 1874 # From W. Jones (1992-11-06): 1875 # The. . .below is based on information I got from our law library, the 1876 # provincial archives, and the provincial Community Services department. 1877 # A precise history would require digging through newspaper archives, and 1878 # since you didn't say what you wanted, I didn't bother. 1879 # 1880 # Saskatchewan is split by a time zone meridian (105W) and over the years 1881 # the boundary became pretty ragged as communities near it reevaluated 1882 # their affiliations in one direction or the other. In 1965 a provincial 1883 # referendum favoured legislating common time practices. 1884 # 1885 # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of 1886 # Saskatchewan 1978) was proclaimed, and established that the eastern 1887 # part of Saskatchewan would use CST year round, that districts in 1888 # northwest Saskatchewan would by default follow CST but could opt to 1889 # follow Mountain Time rules (thus 1 hour difference in the winter and 1890 # zero in the summer), and that districts in southwest Saskatchewan would 1891 # by default follow MT but could opt to follow CST. 1892 # 1893 # It took a few years for the dust to settle (I know one story of a town 1894 # on one time zone having its school in another, such that a mom had to 1895 # serve her family lunch in two shifts), but presently it seems that only 1896 # a few towns on the border with Alberta (e.g. Lloydminster) follow MT 1897 # rules any more; all other districts appear to have used CST year round 1898 # since sometime in the 1960s. 1899 1900 # From Chris Walton (2006-06-26): 1901 # The Saskatchewan time act which was last updated in 1996 is about 30 pages 1902 # long and rather painful to read. 1903 # http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf 1904 1905 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1906 Rule Regina 1918 only - Apr 14 2:00 1:00 D 1907 Rule Regina 1918 only - Oct 27 2:00 0 S 1908 Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D 1909 Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S 1910 Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D 1911 Rule Regina 1937 only - Oct Sun>=8 0:00 0 S 1912 Rule Regina 1938 only - Oct Sun>=1 0:00 0 S 1913 Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S 1914 Rule Regina 1942 only - Feb 9 2:00 1:00 W # War 1915 Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace 1916 Rule Regina 1945 only - Sep lastSun 2:00 0 S 1917 Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D 1918 Rule Regina 1946 only - Oct Sun>=8 2:00 0 S 1919 Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D 1920 Rule Regina 1947 1957 - Sep lastSun 2:00 0 S 1921 Rule Regina 1959 only - Apr lastSun 2:00 1:00 D 1922 Rule Regina 1959 only - Oct lastSun 2:00 0 S 1923 # 1924 Rule Swift 1957 only - Apr lastSun 2:00 1:00 D 1925 Rule Swift 1957 only - Oct lastSun 2:00 0 S 1926 Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D 1927 Rule Swift 1959 only - Oct lastSun 2:00 0 S 1928 Rule Swift 1960 1961 - Sep lastSun 2:00 0 S 1929 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1930 Zone America/Regina -6:58:36 - LMT 1905 Sep 1931 -7:00 Regina M%sT 1960 Apr lastSun 2:00 1932 -6:00 - CST 1933 Zone America/Swift_Current -7:11:20 - LMT 1905 Sep 1934 -7:00 Canada M%sT 1946 Apr lastSun 2:00 1935 -7:00 Regina M%sT 1950 1936 -7:00 Swift M%sT 1972 Apr lastSun 2:00 1937 -6:00 - CST 1938 1939 1940 # Alberta 1941 1942 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1943 Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D 1944 Rule Edm 1918 only - Oct 27 2:00 0 S 1945 Rule Edm 1919 only - May 27 2:00 0 S 1946 Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D 1947 Rule Edm 1920 only - Oct lastSun 2:00 0 S 1948 Rule Edm 1921 1923 - Sep lastSun 2:00 0 S 1949 Rule Edm 1942 only - Feb 9 2:00 1:00 W # War 1950 Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace 1951 Rule Edm 1945 only - Sep lastSun 2:00 0 S 1952 Rule Edm 1947 only - Apr lastSun 2:00 1:00 D 1953 Rule Edm 1947 only - Sep lastSun 2:00 0 S 1954 Rule Edm 1967 only - Apr lastSun 2:00 1:00 D 1955 Rule Edm 1967 only - Oct lastSun 2:00 0 S 1956 Rule Edm 1969 only - Apr lastSun 2:00 1:00 D 1957 Rule Edm 1969 only - Oct lastSun 2:00 0 S 1958 Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D 1959 Rule Edm 1972 2006 - Oct lastSun 2:00 0 S 1960 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1961 Zone America/Edmonton -7:33:52 - LMT 1906 Sep 1962 -7:00 Edm M%sT 1987 1963 -7:00 Canada M%sT 1964 1965 1966 # British Columbia 1967 1968 # From Paul Eggert (2006-03-22): 1969 # Shanks & Pottenger write that since 1970 most of this region has 1970 # been like Vancouver. 1971 # Dawson Creek uses MST. Much of east BC is like Edmonton. 1972 # Matthews and Vincent (1998) write that Creston is like Dawson Creek. 1973 1974 # It seems though that (re: Creston) is not entirely correct: 1975 1976 # From Chris Walton (2011-12-01): 1977 # There are two areas within the Canadian province of British Columbia 1978 # that do not currently observe daylight saving: 1979 # a) The Creston Valley (includes the town of Creston and surrounding area) 1980 # b) The eastern half of the Peace River Regional District 1981 # (includes the cities of Dawson Creek and Fort St. John) 1982 1983 # Earlier this year I stumbled across a detailed article about the time 1984 # keeping history of Creston; it was written by Tammy Hardwick who is the 1985 # manager of the Creston & District Museum. The article was written in May 2009. 1986 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260 1987 # According to the article, Creston has not changed its clocks since June 1918. 1988 # i.e. Creston has been stuck on UT-7 for 93 years. 1989 # Dawson Creek, on the other hand, changed its clocks as recently as April 1972. 1990 1991 # Unfortunately the exact date for the time change in June 1918 remains 1992 # unknown and will be difficult to ascertain. I e-mailed Tammy a few months 1993 # ago to ask if Sunday June 2 was a reasonable guess. She said it was just 1994 # as plausible as any other date (in June). She also said that after writing 1995 # the article she had discovered another time change in 1916; this is the 1996 # subject of another article which she wrote in October 2010. 1997 # http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56 1998 1999 # Here is a summary of the three clock change events in Creston's history: 2000 # 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7) 2001 # Exact date unknown 2002 # 2. Oct 1916: switch to Pacific Standard Time (GMT-8) 2003 # Exact date in October unknown; Sunday October 1 is a reasonable guess. 2004 # 3. June 1918: switch to Pacific Daylight Time (GMT-7) 2005 # Exact date in June unknown; Sunday June 2 is a reasonable guess. 2006 # note 1: 2007 # On Oct 27/1918 when daylight saving ended in the rest of Canada, 2008 # Creston did not change its clocks. 2009 # note 2: 2010 # During WWII when the Federal Government legislated a mandatory clock change, 2011 # Creston did not oblige. 2012 # note 3: 2013 # There is no guarantee that Creston will remain on Mountain Standard Time 2014 # (UTC-7) forever. 2015 # The subject was debated at least once this year by the town Council. 2016 # http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html 2017 2018 # During a period WWII, summer time (Daylight saying) was mandatory in Canada. 2019 # In Creston, that was handled by shifting the area to PST (-8:00) then applying 2020 # summer time to cause the offset to be -7:00, the same as it had been before 2021 # the change. It can be argued that the timezone abbreviation during this 2022 # period should be PDT rather than MST, but that doesn't seem important enough 2023 # (to anyone) to further complicate the rules. 2024 2025 # The transition dates (and times) are guesses. 2026 2027 # From Matt Johnson (2015-09-21): 2028 # Fort Nelson, BC, Canada will cancel DST this year. So while previously they 2029 # were aligned with America/Vancouver, they're now aligned with 2030 # America/Dawson_Creek. 2031 # http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html 2032 # 2033 # From Tim Parenti (2015-09-23): 2034 # This requires a new zone for the Northern Rockies Regional Municipality, 2035 # America/Fort_Nelson. The resolution of 2014-12-08 was reached following a 2036 # 2014-11-15 poll with nearly 75% support. Effectively, the municipality has 2037 # been on MST (-0700) like Dawson Creek since it advanced its clocks on 2038 # 2015-03-08. 2039 # 2040 # From Paul Eggert (2015-09-23): 2041 # Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver. 2042 2043 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2044 Rule Vanc 1918 only - Apr 14 2:00 1:00 D 2045 Rule Vanc 1918 only - Oct 27 2:00 0 S 2046 Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War 2047 Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace 2048 Rule Vanc 1945 only - Sep 30 2:00 0 S 2049 Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D 2050 Rule Vanc 1946 only - Oct 13 2:00 0 S 2051 Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S 2052 Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S 2053 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2054 Zone America/Vancouver -8:12:28 - LMT 1884 2055 -8:00 Vanc P%sT 1987 2056 -8:00 Canada P%sT 2057 Zone America/Dawson_Creek -8:00:56 - LMT 1884 2058 -8:00 Canada P%sT 1947 2059 -8:00 Vanc P%sT 1972 Aug 30 2:00 2060 -7:00 - MST 2061 Zone America/Fort_Nelson -8:10:47 - LMT 1884 2062 -8:00 Vanc P%sT 1946 2063 -8:00 - PST 1947 2064 -8:00 Vanc P%sT 1987 2065 -8:00 Canada P%sT 2015 Mar 8 2:00 2066 -7:00 - MST 2067 Zone America/Creston -7:46:04 - LMT 1884 2068 -7:00 - MST 1916 Oct 1 2069 -8:00 - PST 1918 Jun 2 2070 -7:00 - MST 2071 2072 # Northwest Territories, Nunavut, Yukon 2073 2074 # From Paul Eggert (2006-03-22): 2075 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979. 2076 # Mathew Englander (1996-10-07) gives the following refs: 2077 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, 2078 # c. 7 defines Yukon standard time as UTC-9.... 2079 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). 2080 # [https://www.canlii.org/en/ca/laws/stat/rsc-1985-c-i-21/latest/rsc-1985-c-i-21.html] 2081 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. 2082 # * O.I.C. 1980/02 established DST. 2083 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. 2084 2085 # From Brian Inglis (2015-04-14): 2086 # 2087 # I tried to trace the history of Yukon time and found the following 2088 # regulations, giving the reference title and URL if found, regulation name, 2089 # and relevant quote if available. Each regulation specifically revokes its 2090 # predecessor. The final reference is to the current Interpretation Act 2091 # authorizing and resulting from these regulatory changes. 2092 # 2093 # Only recent regulations were retrievable via Yukon government site search or 2094 # index, and only some via Canadian legal sources. Other sources used include 2095 # articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS 2096 # Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and 2097 # 1970 quoted below; each article includes current extracts from provincial 2098 # and territorial ST and DST regulations at the end, summaries and details of 2099 # standard times and daylight saving time at many locations across Canada, 2100 # with time zone maps, tables and calculations for Canadian Sunrise, Sunset, 2101 # and LMST; they also cover many countries and global locations, with a chart 2102 # and table showing current Universal Time offsets, and may be useful as 2103 # another source of information for 1970 and earlier. 2104 # 2105 # * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26, 2106 # pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS) 2107 # http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75: 2108 # Yukon Interpretation Ordinance 2109 # Yukon standard time is the local mean time at the one hundred and 2110 # thirty-fifth meridian. 2111 # 2112 # * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.; 2113 # JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System 2114 # (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1: 2115 # Yukon Interpretation Ordinance, 1955, Chap. 16. 2116 # 2117 # (1) Subject to this section, standard time shall be reckoned as nine 2118 # hours behind Greenwich Time and called Yukon Standard Time. 2119 # 2120 # (2) Notwithstanding subsection (1), the Commissioner may make regulations 2121 # varying the manner of reckoning standard time. 2122 # 2123 # * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance 2124 # http://? - no online source found 2125 # 2126 # * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC, 2127 # Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS) 2128 # http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon 2129 # Territory Commissioner's Order 1967-59 Interpretation Ordinance ... 2130 # 2131 # 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon 2132 # Territory on 27th January, 1966, is hereby revoked. 2133 # 2134 # 2. Yukon (East) Standard Time as defined by section 36 of the 2135 # Interpretation Ordinance from and after mid-night on the 28th day of May, 2136 # 1967 shall be reckoned in the same manner as Pacific Standard Time, that 2137 # is to say, eight hours behind Greenwich Time in the area of the Yukon 2138 # Territory lying east of the 138th degree longitude west. 2139 # 2140 # 3. In the remainder of the Territory, lying west of the 138th degree 2141 # longitude west, Yukon (West) Standard Time shall be reckoned as nine 2142 # hours behind Greenwich Time. 2143 # 2144 # * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214 2145 # https://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html 2146 # C.O. 1973/214 INTERPRETATION ACT ... 2147 # 2148 # 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby 2149 # revoked. 2150 # 2151 # 2. Yukon Standard Time as defined by section 36 of the Interpretation 2152 # Act from and after midnight on the twenty-eighth day of October, 1973 2153 # shall be reckoned in the same manner as Pacific Standard Time, that is 2154 # to say eight hours behind Greenwich Time. 2155 # 2156 # * O.I.C. 1980/02 INTERPRETATION ACT 2157 # http://? - no online source found 2158 # 2159 # * Yukon Daylight Saving Time, YOIC 1987/56 2160 # https://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html 2161 # O.I.C. 1987/056 INTERPRETATION ACT ... 2162 # 2163 # In every year between 2164 # (a) two o'clock in the morning in the first Sunday in April, and 2165 # (b) two o'clock in the morning in the last Sunday in October, 2166 # Standard Time shall be reckoned as seven hours behind Greenwich Time and 2167 # called Yukon Daylight Saving Time. 2168 # ... 2169 # Dated ... 9th day of March, A.D., 1987. 2170 # 2171 # * Yukon Daylight Saving Time 2006, YOIC 2006/127 2172 # https://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html 2173 # O.I.C. 2006/127 INTERPRETATION ACT ... 2174 # 2175 # 1. In Yukon each year the time for general purposes shall be 7 hours 2176 # behind Greenwich mean time during the period commencing at two o'clock 2177 # in the forenoon on the second Sunday of March and ending at two o'clock 2178 # in the forenoon on the first Sunday of November and shall be called 2179 # Yukon Daylight Saving Time. 2180 # 2181 # 2. Order-in-Council 1987/56 is revoked. 2182 # 2183 # 3. This order comes into force January 1, 2007. 2184 # 2185 # * Interpretation Act, RSY 2002, c 125 2186 # https://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html 2187 2188 # From Rives McDow (1999-09-04): 2189 # Nunavut ... moved ... to incorporate the whole territory into one time zone. 2190 # Nunavut moves to single time zone Oct. 31 2191 # http://www.nunatsiaq.com/nunavut/nvt90903_13.html 2192 # 2193 # From Antoine Leca (1999-09-06): 2194 # We then need to create a new timezone for the Kitikmeot region of Nunavut 2195 # to differentiate it from the Yellowknife region. 2196 2197 # From Paul Eggert (1999-09-20): 2198 # Basic Facts: The New Territory 2199 # http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html 2200 # (1999) reports that Pangnirtung operates on eastern time, 2201 # and that Coral Harbour does not observe DST. We don't know when 2202 # Pangnirtung switched to eastern time; we'll guess 1995. 2203 2204 # From Rives McDow (1999-11-08): 2205 # On October 31, when the rest of Nunavut went to Central time, 2206 # Pangnirtung wobbled. Here is the result of their wobble: 2207 # 2208 # The following businesses and organizations in Pangnirtung use Central Time: 2209 # 2210 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP, 2211 # Eastern Arctic National Parks, A & D Specialist 2212 # 2213 # The following businesses and organizations in Pangnirtung use Eastern Time: 2214 # 2215 # Hamlet office, All other businesses, Both schools, Airport operator 2216 # 2217 # This has made for an interesting situation there, which warranted the news. 2218 # No one there that I spoke with seems concerned, or has plans to 2219 # change the local methods of keeping time, as it evidently does not 2220 # really interfere with any activities or make things difficult locally. 2221 # They plan to celebrate New Year's turn-over twice, one hour apart, 2222 # so it appears that the situation will last at least that long. 2223 # The Nunavut Intergovernmental Affairs hopes that they will "come to 2224 # their senses", but the locals evidently don't see any problem with 2225 # the current state of affairs. 2226 2227 # From Michaela Rodrigue, writing in the 2228 # Nunatsiaq News (1999-11-19): 2229 # http://www.nunatsiaqonline.ca/archives/nunavut991130/nvt91119_17.html 2230 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, 2231 # central - or Nunavut time - for government offices, and eastern time 2232 # for municipal offices and schools.... Igloolik [was similar but then] 2233 # made the switch to central time on Saturday, Nov. 6. 2234 2235 # From Paul Eggert (2000-10-02): 2236 # Matthews and Vincent (1998) say the following, but we lack histories 2237 # for these potential new Zones. 2238 # 2239 # The Canadian Forces station at Alert uses Eastern Time while the 2240 # handful of residents at the Eureka weather station [in the Central 2241 # zone] skip daylight savings. Baffin Island, which is crossed by the 2242 # Central, Eastern and Atlantic Time zones only uses Eastern Time. 2243 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of 2244 # Central Time and Southampton Island [in the Central zone] is not 2245 # required to use daylight savings. 2246 2247 # From <http://www.nunatsiaqonline.ca/archives/nunavut001130/nvt21110_02.html> 2248 # Nunavut now has two time zones (2000-11-10): 2249 # The Nunavut government would allow its employees in Kugluktuk and 2250 # Cambridge Bay to operate on central time year-round, putting them 2251 # one hour behind the rest of Nunavut for six months during the winter. 2252 # At the end of October the two communities had rebelled against 2253 # Nunavut's unified time zone, refusing to shift to eastern time with 2254 # the rest of the territory for the winter. Cambridge Bay remained on 2255 # central time, while Kugluktuk, even farther west, reverted to 2256 # mountain time, which they had used before the advent of Nunavut's 2257 # unified time zone in 1999. 2258 # 2259 # From Rives McDow (2001-01-20), quoting the Nunavut government: 2260 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000. 2261 2262 # From Paul Eggert (2000-12-04): 2263 # Let's just keep track of the official times for now. 2264 2265 # From Rives McDow (2001-03-07): 2266 # The premier of Nunavut has issued a ministerial statement advising 2267 # that effective 2001-04-01, the territory of Nunavut will revert 2268 # back to three time zones (mountain, central, and eastern). Of the 2269 # cities in Nunavut, Coral Harbor is the only one that I know of that 2270 # has said it will not observe dst, staying on EST year round. I'm 2271 # checking for more info, and will get back to you if I come up with 2272 # more. 2273 # [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).] 2274 2275 # From Gwillim Law (2005-05-21): 2276 # According to ... 2277 # http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp 2278 # (from a 1998 Canadian Geographic article), the de facto and de jure time 2279 # for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year 2280 # round. Using Google, it's easy to find other websites that confirm this. 2281 # I wasn't able to find how far back this time regimen goes, but since it 2282 # predates the creation of Nunavut, it probably goes back many years.... 2283 # The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. 2284 # 2285 # From Paul Eggert (2014-10-17): 2286 # For lack of better information, assume that Southampton Island observed 2287 # daylight saving only during wartime. Gwillim Law's email also 2288 # mentioned maps now maintained by National Research Council Canada; 2289 # see above for an up-to-date link. 2290 2291 # From Chris Walton (2007-03-01): 2292 # ... the community of Resolute (located on Cornwallis Island in 2293 # Nunavut) moved from Central Time to Eastern Time last November. 2294 # Basically the community did not change its clocks at the end of 2295 # daylight saving.... 2296 # http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html 2297 2298 # From Chris Walton (2011-03-21): 2299 # Back in 2007 I initiated the creation of a new "zone file" for Resolute 2300 # Bay. Resolute Bay is a small community located about 900km north of 2301 # the Arctic Circle. The zone file was required because Resolute Bay had 2302 # decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007. 2303 # 2304 # According to new information which I received last week, Resolute Bay 2305 # went back to using UTC-6 in the winter of 2007-2008... 2306 # 2307 # On March 11/2007 most of Canada went onto daylight saving. On March 2308 # 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I 2309 # talked to somebody that was both knowledgeable and helpful. I was able 2310 # to confirm that Resolute Bay was still operating on UTC-5. It was 2311 # explained to me that Resolute Bay had been on the Eastern Time zone 2312 # (EST) in the winter, and was now back on the Central Time zone (CDT). 2313 # i.e. the time zone had changed twice in the last year but the clocks 2314 # had not moved. The residents had to know which time zone they were in 2315 # so they could follow the correct TV schedule... 2316 # 2317 # On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I 2318 # phoned the Resolute Bay hamlet office...[D]ue to the challenging nature 2319 # of the phone call, I decided to seek out an alternate source of 2320 # information. I found an e-mail address for somebody by the name of 2321 # Stephanie Adams whose job was listed as "Inns North Support Officer for 2322 # Arctic Co-operatives." I was under the impression that Stephanie lived 2323 # and worked in Resolute Bay... 2324 # 2325 # On March 14/2011 I phoned the hamlet office again. I was told that 2326 # Resolute Bay had been using Central Standard Time over the winter of 2327 # 2010-2011 and that the clocks had therefore been moved one hour ahead 2328 # on March 13/2011. The person I talked to was aware that Resolute Bay 2329 # had previously experimented with Eastern Standard Time but he could not 2330 # tell me when the practice had stopped. 2331 # 2332 # On March 17/2011 I searched the Web to find an e-mail address of 2333 # somebody that might be able to tell me exactly when Resolute Bay went 2334 # off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz 2335 # used to be the mayor of Resolute Bay and he apparently owns half the 2336 # businesses including "South Camp Inn." This website has some info on 2337 # Aziz: 2338 # http://www.uphere.ca/node/493 2339 # 2340 # I sent Aziz an e-mail asking when Resolute Bay had stopped using 2341 # Eastern Standard Time. 2342 # 2343 # Aziz responded quickly with this: "hi, The time was not changed for the 2344 # 1 year only, the following year, the community went back to the old way 2345 # of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in 2346 # the winter Zulu plus 6 hrs" 2347 # 2348 # This of course conflicted with everything I had ascertained in November 2008. 2349 # 2350 # I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz 2351 # responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You 2352 # may want to check with the weather office in Resolute Bay or do a 2353 # search on the weather through Env. Canada. web site" 2354 # 2355 # If I had realized the Stephanie did not live in Resolute Bay I would 2356 # never have contacted her. I now believe that all the information I 2357 # obtained in November 2008 should be ignored... 2358 # I apologize for reporting incorrect information in 2008. 2359 2360 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2361 Rule NT_YK 1918 only - Apr 14 2:00 1:00 D 2362 Rule NT_YK 1918 only - Oct 27 2:00 0 S 2363 Rule NT_YK 1919 only - May 25 2:00 1:00 D 2364 Rule NT_YK 1919 only - Nov 1 0:00 0 S 2365 Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War 2366 Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace 2367 Rule NT_YK 1945 only - Sep 30 2:00 0 S 2368 Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD 2369 Rule NT_YK 1965 only - Oct lastSun 2:00 0 S 2370 Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D 2371 Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S 2372 Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D 2373 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2374 # aka Panniqtuuq 2375 Zone America/Pangnirtung 0 - -00 1921 # trading post est. 2376 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 2377 -5:00 Canada E%sT 1999 Oct 31 2:00 2378 -6:00 Canada C%sT 2000 Oct 29 2:00 2379 -5:00 Canada E%sT 2380 # formerly Frobisher Bay 2381 Zone America/Iqaluit 0 - -00 1942 Aug # Frobisher Bay est. 2382 -5:00 NT_YK E%sT 1999 Oct 31 2:00 2383 -6:00 Canada C%sT 2000 Oct 29 2:00 2384 -5:00 Canada E%sT 2385 # aka Qausuittuq 2386 Zone America/Resolute 0 - -00 1947 Aug 31 # Resolute founded 2387 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2388 -5:00 - EST 2001 Apr 1 3:00 2389 -6:00 Canada C%sT 2006 Oct 29 2:00 2390 -5:00 - EST 2007 Mar 11 3:00 2391 -6:00 Canada C%sT 2392 # aka Kangiqiniq 2393 Zone America/Rankin_Inlet 0 - -00 1957 # Rankin Inlet founded 2394 -6:00 NT_YK C%sT 2000 Oct 29 2:00 2395 -5:00 - EST 2001 Apr 1 3:00 2396 -6:00 Canada C%sT 2397 # aka Iqaluktuuttiaq 2398 Zone America/Cambridge_Bay 0 - -00 1920 # trading post est.? 2399 -7:00 NT_YK M%sT 1999 Oct 31 2:00 2400 -6:00 Canada C%sT 2000 Oct 29 2:00 2401 -5:00 - EST 2000 Nov 5 0:00 2402 -6:00 - CST 2001 Apr 1 3:00 2403 -7:00 Canada M%sT 2404 Zone America/Yellowknife 0 - -00 1935 # Yellowknife founded? 2405 -7:00 NT_YK M%sT 1980 2406 -7:00 Canada M%sT 2407 Zone America/Inuvik 0 - -00 1953 # Inuvik founded 2408 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 2409 -7:00 NT_YK M%sT 1980 2410 -7:00 Canada M%sT 2411 Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 2412 -9:00 NT_YK Y%sT 1967 May 28 0:00 2413 -8:00 NT_YK P%sT 1980 2414 -8:00 Canada P%sT 2415 Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 2416 -9:00 NT_YK Y%sT 1973 Oct 28 0:00 2417 -8:00 NT_YK P%sT 1980 2418 -8:00 Canada P%sT 2419 2420 2421 ############################################################################### 2422 2423 # Mexico 2424 2425 # From Paul Eggert (2014-12-07): 2426 # The Investigation and Analysis Service of the 2427 # Mexican Library of Congress (MLoC) has published a 2428 # history of Mexican local time (in Spanish) 2429 # http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm 2430 # 2431 # Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC. 2432 # (In all cases we go with the MLoC.) 2433 # S&P report that Baja was at -8:00 in 1922/1923. 2434 # S&P say the 1930 transition in Baja was 1930-11-16. 2435 # S&P report no DST during summer 1931. 2436 # S&P report a transition at 1932-03-30 23:00, not 1932-04-01. 2437 2438 # From Gwillim Law (2001-02-20): 2439 # There are some other discrepancies between the Decrees page and the 2440 # tz database. I think they can best be explained by supposing that 2441 # the researchers who prepared the Decrees page failed to find some of 2442 # the relevant documents. 2443 2444 # From Alan Perry (1996-02-15): 2445 # A guy from our Mexico subsidiary finally found the Presidential Decree 2446 # outlining the timezone changes in Mexico. 2447 # 2448 # ------------- Begin Forwarded Message ------------- 2449 # 2450 # I finally got my hands on the Official Presidential Decree that sets up the 2451 # rules for the DST changes. The rules are: 2452 # 2453 # 1. The country is divided in 3 timezones: 2454 # - Baja California Norte (the Mexico/BajaNorte TZ) 2455 # - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) 2456 # - The rest of the country (the Mexico/General TZ) 2457 # 2458 # 2. From the first Sunday in April at 2:00 AM to the last Sunday in October 2459 # at 2:00 AM, the times in each zone are as follows: 2460 # BajaNorte: GMT+7 2461 # BajaSur: GMT+6 2462 # General: GMT+5 2463 # 2464 # 3. The rest of the year, the times are as follows: 2465 # BajaNorte: GMT+8 2466 # BajaSur: GMT+7 2467 # General: GMT+6 2468 # 2469 # The Decree was published in Mexico's Official Newspaper on January 4th. 2470 # 2471 # -------------- End Forwarded Message -------------- 2472 # From Paul Eggert (1996-06-12): 2473 # For an English translation of the decree, see 2474 # "Diario Oficial: Time Zone Changeover" (1996-01-04). 2475 # http://mexico-travel.com/extra/timezone_eng.html 2476 2477 # From Rives McDow (1998-10-08): 2478 # The State of Quintana Roo has reverted back to central STD and DST times 2479 # (i.e. UTC -0600 and -0500 as of 1998-08-02). 2480 2481 # From Rives McDow (2000-01-10): 2482 # Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time 2483 # zone 5 hours from the International Date Line, and will not observe daylight 2484 # savings time so as to stay on the same time zone as the southern part of 2485 # Arizona year round. 2486 2487 # From Jesper Nørgaard, translating 2488 # <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17): 2489 # In Oaxaca, the 55.000 teachers from the Section 22 of the National 2490 # Syndicate of Education Workers, refuse to apply daylight saving each 2491 # year, so that the more than 10,000 schools work at normal hour the 2492 # whole year. 2493 2494 # From Gwillim Law (2001-01-19): 2495 # <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says 2496 # (translated):... 2497 # January 17, 2000 - The Energy Secretary, Ernesto Martens, announced 2498 # that Summer Time will be reduced from seven to five months, starting 2499 # this year.... 2500 # http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001 2501 # [translated], says "summer time will ... take effect on the first Sunday 2502 # in May, and end on the last Sunday of September. 2503 2504 # From Arthur David Olson (2001-01-25): 2505 # The 2001-01-24 traditional Washington Post contained the page one 2506 # story "Timely Issue Divides Mexicans."... 2507 # http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html 2508 # ... Mexico City Mayor López Obrador "...is threatening to keep 2509 # Mexico City and its 20 million residents on a different time than 2510 # the rest of the country..." In particular, López Obrador would abolish 2511 # observation of Daylight Saving Time. 2512 2513 # Official statute published by the Energy Department 2514 # http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre 2515 # (2001-02-01) shows Baja and Chihauhua as still using US DST rules, 2516 # and Sonora with no DST. This was reported by Jesper Nørgaard (2001-02-03). 2517 2518 # From Paul Eggert (2001-03-03): 2519 # 2520 # http://www.latimes.com/news/nation/20010303/t000018766.html 2521 # James F. Smith writes in today's LA Times 2522 # * Sonora will continue to observe standard time. 2523 # * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that 2524 # the Federal District will not adopt DST. 2525 # * 4 of 16 district leaders announced they'll ignore the decree. 2526 # * The decree does not affect federal-controlled facilities including 2527 # the airport, banks, hospitals, and schools. 2528 # 2529 # For now we'll assume that the Federal District will bow to federal rules. 2530 2531 # From Jesper Nørgaard (2001-04-01): 2532 # I found some references to the Mexican application of daylight 2533 # saving, which modifies what I had already sent you, stating earlier 2534 # that a number of northern Mexican states would go on daylight 2535 # saving. The modification reverts this to only cover Baja California 2536 # (Norte), while all other states (except Sonora, who has no daylight 2537 # saving all year) will follow the original decree of president 2538 # Vicente Fox, starting daylight saving May 6, 2001 and ending 2539 # September 30, 2001. 2540 # References: "Diario de Monterrey" <http://www.diariodemonterrey.com/index.asp> 2541 # Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31) 2542 2543 # From Reuters (2001-09-04): 2544 # Mexico's Supreme Court on Tuesday declared that daylight savings was 2545 # unconstitutional in Mexico City, creating the possibility the 2546 # capital will be in a different time zone from the rest of the nation 2547 # next year.... The Supreme Court's ruling takes effect at 2:00 2548 # a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to 2549 # standard time. "This is so residents of the Federal District are not 2550 # subject to unexpected time changes," a statement from the court said. 2551 2552 # From Jesper Nørgaard Welen (2002-03-12): 2553 # ... consulting my local grocery store(!) and my coworkers, they all insisted 2554 # that a new decision had been made to reinstate US style DST in Mexico.... 2555 # http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) 2556 # confirms this. Sonora as usual is the only state where DST is not applied. 2557 2558 # From Steffen Thorsen (2009-12-28): 2559 # 2560 # Steffen Thorsen wrote: 2561 # > Mexico's House of Representatives has approved a proposal for northern 2562 # > Mexico's border cities to share the same daylight saving schedule as 2563 # > the United States. 2564 # Now this has passed both the Congress and the Senate, so starting from 2565 # 2010, some border regions will be the same: 2566 # http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/ 2567 # http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939 2568 # (Spanish) 2569 # 2570 # Could not find the new law text, but the proposed law text changes are here: 2571 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf 2572 # (Gaceta Parlamentaria) 2573 # 2574 # There is also a list of the votes here: 2575 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html 2576 # 2577 # Our page: 2578 # https://www.timeanddate.com/news/time/north-mexico-dst-change.html 2579 2580 # From Arthur David Olson (2010-01-20): 2581 # The page 2582 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2583 # includes this text: 2584 # En los municipios fronterizos de Tijuana y Mexicali en Baja California; 2585 # Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila; 2586 # Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en 2587 # Tamaulipas, la aplicación de este horario estacional surtirá efecto 2588 # desde las dos horas del segundo domingo de marzo y concluirá a las dos 2589 # horas del primer domingo de noviembre. 2590 # En los municipios fronterizos que se encuentren ubicados en la franja 2591 # fronteriza norte en el territorio comprendido entre la línea 2592 # internacional y la línea paralela ubicada a una distancia de veinte 2593 # kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el 2594 # interior del país, la aplicación de este horario estacional surtirá 2595 # efecto desde las dos horas del segundo domingo de marzo y concluirá a 2596 # las dos horas del primer domingo de noviembre. 2597 2598 # From Steffen Thorsen (2014-12-08), translated by Gwillim Law: 2599 # The Mexican state of Quintana Roo will likely change to EST in 2015. 2600 # 2601 # http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo 2602 # "With this change, the time conflict that has existed between the municipios 2603 # of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an 2604 # end. The latter declared itself in rebellion 15 years ago when a time change 2605 # was initiated in Mexico, and since then it has refused to change its time 2606 # zone along with the rest of the country." 2607 # 2608 # From Steffen Thorsen (2015-01-14), translated by Gwillim Law: 2609 # http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html 2610 # "...the new time zone will come into effect at two o'clock on the first Sunday 2611 # of February, when we will have to advance the clock one hour from its current 2612 # time..." 2613 # Also, the new zone will not use DST. 2614 # 2615 # From Carlos Raúl Perasso (2015-02-02): 2616 # The decree that modifies the Mexican Hour System Law has finally 2617 # been published at the Diario Oficial de la Federación 2618 # http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015 2619 # It establishes 5 zones for Mexico: 2620 # 1- Zona Centro (Central Zone): Corresponds to longitude 90 W, 2621 # includes most of Mexico, excluding what's mentioned below. 2622 # 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the 2623 # states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía 2624 # de Banderas which lies in Central Zone); Sinaloa and Sonora. 2625 # 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the 2626 # state of Baja California. 2627 # 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state 2628 # of Quintana Roo. 2629 # 5- The islands, reefs and keys shall take their timezone from the 2630 # longitude they are located at. 2631 2632 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2633 Rule Mexico 1939 only - Feb 5 0:00 1:00 D 2634 Rule Mexico 1939 only - Jun 25 0:00 0 S 2635 Rule Mexico 1940 only - Dec 9 0:00 1:00 D 2636 Rule Mexico 1941 only - Apr 1 0:00 0 S 2637 Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War 2638 Rule Mexico 1944 only - May 1 0:00 0 S 2639 Rule Mexico 1950 only - Feb 12 0:00 1:00 D 2640 Rule Mexico 1950 only - Jul 30 0:00 0 S 2641 Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D 2642 Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S 2643 Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D 2644 Rule Mexico 2001 only - Sep lastSun 2:00 0 S 2645 Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D 2646 Rule Mexico 2002 max - Oct lastSun 2:00 0 S 2647 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2648 # Quintana Roo; represented by Cancún 2649 Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 2650 -6:00 - CST 1981 Dec 23 2651 -5:00 Mexico E%sT 1998 Aug 2 2:00 2652 -6:00 Mexico C%sT 2015 Feb 1 2:00 2653 -5:00 - EST 2654 # Campeche, Yucatán; represented by Mérida 2655 Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 2656 -6:00 - CST 1981 Dec 23 2657 -5:00 - EST 1982 Dec 2 2658 -6:00 Mexico C%sT 2659 # Coahuila, Nuevo León, Tamaulipas (near US border) 2660 # This includes the following municipalities: 2661 # in Coahuila: Ocampo, Acuña, Zaragoza, Jiménez, Piedras Negras, Nava, 2662 # Guerrero, Hidalgo. 2663 # in Nuevo León: Anáhuac, Los Aldama. 2664 # in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo, 2665 # Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso, Matamoros. 2666 # See: Inicia mañana Horario de Verano en zona fronteriza, El Universal, 2667 # 2016-03-12 2668 # http://www.eluniversal.com.mx/articulo/estados/2016/03/12/inicia-manana-horario-de-verano-en-zona-fronteriza 2669 Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00 2670 -6:00 - CST 1988 2671 -6:00 US C%sT 1989 2672 -6:00 Mexico C%sT 2010 2673 -6:00 US C%sT 2674 # Durango; Coahuila, Nuevo León, Tamaulipas (away from US border) 2675 Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 2676 -6:00 - CST 1988 2677 -6:00 US C%sT 1989 2678 -6:00 Mexico C%sT 2679 # Central Mexico 2680 Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 2681 -7:00 - MST 1927 Jun 10 23:00 2682 -6:00 - CST 1930 Nov 15 2683 -7:00 - MST 1931 May 1 23:00 2684 -6:00 - CST 1931 Oct 2685 -7:00 - MST 1932 Apr 1 2686 -6:00 Mexico C%sT 2001 Sep 30 2:00 2687 -6:00 - CST 2002 Feb 20 2688 -6:00 Mexico C%sT 2689 # Chihuahua (near US border) 2690 # This includes the municipalities of Janos, Ascensión, Juárez, Guadalupe, 2691 # Práxedis G Guerrero, Coyame del Sotol, Ojinaga, and Manuel Benavides. 2692 # (See the 2016-03-12 El Universal source mentioned above.) 2693 Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20 2694 -7:00 - MST 1927 Jun 10 23:00 2695 -6:00 - CST 1930 Nov 15 2696 -7:00 - MST 1931 May 1 23:00 2697 -6:00 - CST 1931 Oct 2698 -7:00 - MST 1932 Apr 1 2699 -6:00 - CST 1996 2700 -6:00 Mexico C%sT 1998 2701 -6:00 - CST 1998 Apr Sun>=1 3:00 2702 -7:00 Mexico M%sT 2010 2703 -7:00 US M%sT 2704 # Chihuahua (away from US border) 2705 Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 2706 -7:00 - MST 1927 Jun 10 23:00 2707 -6:00 - CST 1930 Nov 15 2708 -7:00 - MST 1931 May 1 23:00 2709 -6:00 - CST 1931 Oct 2710 -7:00 - MST 1932 Apr 1 2711 -6:00 - CST 1996 2712 -6:00 Mexico C%sT 1998 2713 -6:00 - CST 1998 Apr Sun>=1 3:00 2714 -7:00 Mexico M%sT 2715 # Sonora 2716 Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 2717 -7:00 - MST 1927 Jun 10 23:00 2718 -6:00 - CST 1930 Nov 15 2719 -7:00 - MST 1931 May 1 23:00 2720 -6:00 - CST 1931 Oct 2721 -7:00 - MST 1932 Apr 1 2722 -6:00 - CST 1942 Apr 24 2723 -7:00 - MST 1949 Jan 14 2724 -8:00 - PST 1970 2725 -7:00 Mexico M%sT 1999 2726 -7:00 - MST 2727 2728 # From Alexander Krivenyshev (2010-04-21): 2729 # According to news, Bahía de Banderas (Mexican state of Nayarit) 2730 # changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to 2731 # share the same time zone as nearby city Puerto Vallarta, Jalisco). 2732 # 2733 # (Spanish) 2734 # Bahía de Banderas homologa su horario al del centro del 2735 # país, a partir de este domingo 2736 # http://www.nayarit.gob.mx/notes.asp?id=20748 2737 # 2738 # Bahía de Banderas homologa su horario con el del Centro del 2739 # País 2740 # 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 2741 # 2742 # (English) 2743 # Puerto Vallarta and Bahía de Banderas: One Time Zone 2744 # http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml 2745 # http://www.worldtimezone.com/dst_news/dst_news_mexico08.html 2746 # 2747 # "Mexico's Senate approved the amendments to the Mexican Schedule System that 2748 # will allow Bahía de Banderas and Puerto Vallarta to share the same time 2749 # zone ..." 2750 # Baja California Sur, Nayarit, Sinaloa 2751 2752 # From Arthur David Olson (2010-05-01): 2753 # Use "Bahia_Banderas" to keep the name to fourteen characters. 2754 2755 # Mazatlán 2756 Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 2757 -7:00 - MST 1927 Jun 10 23:00 2758 -6:00 - CST 1930 Nov 15 2759 -7:00 - MST 1931 May 1 23:00 2760 -6:00 - CST 1931 Oct 2761 -7:00 - MST 1932 Apr 1 2762 -6:00 - CST 1942 Apr 24 2763 -7:00 - MST 1949 Jan 14 2764 -8:00 - PST 1970 2765 -7:00 Mexico M%sT 2766 2767 # Bahía de Banderas 2768 Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00 2769 -7:00 - MST 1927 Jun 10 23:00 2770 -6:00 - CST 1930 Nov 15 2771 -7:00 - MST 1931 May 1 23:00 2772 -6:00 - CST 1931 Oct 2773 -7:00 - MST 1932 Apr 1 2774 -6:00 - CST 1942 Apr 24 2775 -7:00 - MST 1949 Jan 14 2776 -8:00 - PST 1970 2777 -7:00 Mexico M%sT 2010 Apr 4 2:00 2778 -6:00 Mexico C%sT 2779 2780 # Baja California 2781 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 2782 -7:00 - MST 1924 2783 -8:00 - PST 1927 Jun 10 23:00 2784 -7:00 - MST 1930 Nov 15 2785 -8:00 - PST 1931 Apr 1 2786 -8:00 1:00 PDT 1931 Sep 30 2787 -8:00 - PST 1942 Apr 24 2788 -8:00 1:00 PWT 1945 Aug 14 23:00u 2789 -8:00 1:00 PPT 1945 Nov 12 # Peace 2790 -8:00 - PST 1948 Apr 5 2791 -8:00 1:00 PDT 1949 Jan 14 2792 -8:00 - PST 1954 2793 -8:00 CA P%sT 1961 2794 -8:00 - PST 1976 2795 -8:00 US P%sT 1996 2796 -8:00 Mexico P%sT 2001 2797 -8:00 US P%sT 2002 Feb 20 2798 -8:00 Mexico P%sT 2010 2799 -8:00 US P%sT 2800 # From Paul Eggert (2006-03-22): 2801 # Formerly there was an America/Ensenada zone, which differed from 2802 # America/Tijuana only in that it did not observe DST from 1976 2803 # through 1995. This was as per Shanks (1999). But Shanks & Pottenger say 2804 # Ensenada did not observe DST from 1948 through 1975. Guy Harris reports 2805 # that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and 2806 # Tijuana observe DST," which agrees with Shanks & Pottenger but implies that 2807 # DST-observance was a town-by-town matter back then. This concerns 2808 # data after 1970 so most likely there should be at least one Zone 2809 # other than America/Tijuana for Baja, but it's not clear yet what its 2810 # name or contents should be. 2811 # 2812 # From Paul Eggert (2015-10-08): 2813 # Formerly there was an America/Santa_Isabel zone, but this appears to 2814 # have come from a misreading of 2815 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 2816 # It has been moved to the 'backward' file. 2817 # 2818 # 2819 # Revillagigedo Is 2820 # no information 2821 2822 ############################################################################### 2823 2824 # Anguilla 2825 # Antigua and Barbuda 2826 # See America/Port_of_Spain. 2827 2828 # Bahamas 2829 # 2830 # For 1899 Milne gives -5:09:29.5; round that. 2831 # 2832 # From Sue Williams (2006-12-07): 2833 # The Bahamas announced about a month ago that they plan to change their DST 2834 # rules to sync with the U.S. starting in 2007.... 2835 # http://www.jonesbahamas.com/?c=45&a=10412 2836 2837 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2838 Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S 2839 Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D 2840 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2841 Zone America/Nassau -5:09:30 - LMT 1912 Mar 2 2842 -5:00 Bahamas E%sT 1976 2843 -5:00 US E%sT 2844 2845 # Barbados 2846 2847 # For 1899 Milne gives -3:58:29.2; round that. 2848 2849 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2850 Rule Barb 1977 only - Jun 12 2:00 1:00 D 2851 Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S 2852 Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D 2853 Rule Barb 1979 only - Sep 30 2:00 0 S 2854 Rule Barb 1980 only - Sep 25 2:00 0 S 2855 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2856 Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown 2857 -3:58:29 - BMT 1932 # Bridgetown Mean Time 2858 -4:00 Barb A%sT 2859 2860 # Belize 2861 # Whitman entirely disagrees with Shanks; go with Shanks & Pottenger. 2862 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2863 Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 -0530 2864 Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 CST 2865 Rule Belize 1973 only - Dec 5 0:00 1:00 CDT 2866 Rule Belize 1974 only - Feb 9 0:00 0 CST 2867 Rule Belize 1982 only - Dec 18 0:00 1:00 CDT 2868 Rule Belize 1983 only - Feb 12 0:00 0 CST 2869 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2870 Zone America/Belize -5:52:48 - LMT 1912 Apr 2871 -6:00 Belize %s 2872 2873 # Bermuda 2874 2875 # For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower, 2876 # Bermuda dockyard, Ireland I; round that. 2877 2878 # From Dan Jones, reporting in The Royal Gazette (2006-06-26): 2879 2880 # Next year, however, clocks in the US will go forward on the second Sunday 2881 # in March, until the first Sunday in November. And, after the Time Zone 2882 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on 2883 # Friday, the same thing will happen in Bermuda. 2884 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135 2885 2886 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2887 Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton 2888 -4:00 - AST 1974 Apr 28 2:00 2889 -4:00 Canada A%sT 1976 2890 -4:00 US A%sT 2891 2892 # Cayman Is 2893 # See America/Panama. 2894 2895 # Costa Rica 2896 2897 # Milne gives -5:36:13.3 as San José mean time; round to nearest. 2898 2899 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 2900 Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D 2901 Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S 2902 Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D 2903 # IATA SSIM (1991-09) says the following was at 1:00; 2904 # go with Shanks & Pottenger. 2905 Rule CR 1991 only - Jul 1 0:00 0 S 2906 Rule CR 1992 only - Mar 15 0:00 0 S 2907 # There are too many San Josés elsewhere, so we'll use 'Costa Rica'. 2908 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 2909 Zone America/Costa_Rica -5:36:13 - LMT 1890 # San José 2910 -5:36:13 - SJMT 1921 Jan 15 # San José Mean Time 2911 -6:00 CR C%sT 2912 # Coco 2913 # no information; probably like America/Costa_Rica 2914 2915 # Cuba 2916 2917 # From Paul Eggert (2013-02-21): 2918 # Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57 2919 # for the port, and -5:30 for meteorological observations. 2920 # For now, stick with Shanks & Pottenger. 2921 2922 # From Arthur David Olson (1999-03-29): 2923 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between 2924 # the Cuban National Team and the Baltimore Orioles was carried live on 2925 # the Orioles Radio Network, including affiliate WTOP in Washington, DC. 2926 # During the game, play-by-play announcer Jim Hunter noted that 2927 # "We'll be losing two hours of sleep...Cuba switched to Daylight Saving 2928 # Time today." (The "two hour" remark referred to losing one hour of 2929 # sleep on 1999-03-28 - when the announcers were in Cuba as it switched 2930 # to DST - and one more hour on 1999-04-04 - when the announcers will have 2931 # returned to Baltimore, which switches on that date.) 2932 2933 # From Steffen Thorsen (2013-11-11): 2934 # DST start in Cuba in 2004 ... does not follow the same rules as the 2935 # years before. The correct date should be Sunday 2004-03-28 00:00 ... 2936 # https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html 2937 2938 # From Evert van der Veer via Steffen Thorsen (2004-10-28): 2939 # Cuba is not going back to standard time this year. 2940 # From Paul Eggert (2006-03-22): 2941 # http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html 2942 # says that it's due to a problem at the Antonio Guiteras 2943 # thermoelectric plant, and says "This October there will be no return 2944 # to normal hours (after daylight saving time)". 2945 # For now, let's assume that it's a temporary measure. 2946 2947 # From Carlos A. Carnero Delgado (2005-11-12): 2948 # This year (just like in 2004-2005) there's no change in time zone 2949 # adjustment in Cuba. We will stay in daylight saving time: 2950 # http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html 2951 2952 # From Jesper Nørgaard Welen (2006-10-21): 2953 # An article in GRANMA INTERNACIONAL claims that Cuba will end 2954 # the 3 years of permanent DST next weekend, see 2955 # http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html 2956 # "On Saturday night, October 28 going into Sunday, October 29, at 01:00, 2957 # watches should be set back one hour - going back to 00:00 hours - returning 2958 # to the normal schedule.... 2959 2960 # From Paul Eggert (2007-03-02): 2961 # <http://www.granma.cubaweb.cu/english/news/art89.html>, dated yesterday, 2962 # says Cuban clocks will advance at midnight on March 10. 2963 # For lack of better information, assume Cuba will use US rules, 2964 # except that it switches at midnight standard time as usual. 2965 # 2966 # From Steffen Thorsen (2007-10-25): 2967 # Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week 2968 # earlier - on the last Sunday of October, just like in 2006. 2969 # 2970 # He supplied these references: 2971 # 2972 # http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES 2973 # http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm 2974 # 2975 # From Alex Krivenyshev (2007-10-25): 2976 # Here is also article from Granma (Cuba): 2977 # 2978 # Regirá el Horario Normal desde el próximo domingo 28 de octubre 2979 # http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html 2980 # 2981 # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html 2982 2983 # From Arthur David Olson (2008-03-09): 2984 # I'm in Maryland which is now observing United States Eastern Daylight 2985 # Time. At 9:44 local time I used RealPlayer to listen to 2986 # http://media.enet.cu/radioreloj 2987 # a Cuban information station, and heard 2988 # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"), 2989 # indicating that Cuba is still on standard time. 2990 2991 # From Steffen Thorsen (2008-03-12): 2992 # It seems that Cuba will start DST on Sunday, 2007-03-16... 2993 # It was announced yesterday, according to this source (in Spanish): 2994 # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm 2995 # 2996 # Some more background information is posted here: 2997 # https://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html 2998 # 2999 # The article also says that Cuba has been observing DST since 1963, 3000 # while Shanks (and tzdata) has 1965 as the first date (except in the 3001 # 1940's). Many other web pages in Cuba also claim that it has been 3002 # observed since 1963, but with the exception of 1970 - an exception 3003 # which is not present in tzdata/Shanks. So there is a chance we need to 3004 # change some historic records as well. 3005 # 3006 # One example: 3007 # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm 3008 3009 # From Jesper Nørgaard Welen (2008-03-13): 3010 # The Cuban time change has just been confirmed on the most authoritative 3011 # web site, the Granma. Please check out 3012 # http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html 3013 # 3014 # Basically as expected after Steffen Thorsen's information, the change 3015 # will take place midnight between Saturday and Sunday. 3016 3017 # From Arthur David Olson (2008-03-12): 3018 # Assume Sun>=15 (third Sunday) going forward. 3019 3020 # From Alexander Krivenyshev (2009-03-04) 3021 # According to the Radio Reloj - Cuba will start Daylight Saving Time on 3022 # midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009- 3023 # not on midnight March 14 / March 15 as previously thought. 3024 # 3025 # http://www.worldtimezone.com/dst_news/dst_news_cuba05.html 3026 # (in Spanish) 3027 3028 # From Arthur David Olson (2009-03-09) 3029 # I listened over the Internet to 3030 # http://media.enet.cu/readioreloj 3031 # this morning; when it was 10:05 a. m. here in Bethesda, Maryland the 3032 # the time was announced as "diez cinco" - the same time as here, indicating 3033 # that has indeed switched to DST. Assume second Sunday from 2009 forward. 3034 3035 # From Steffen Thorsen (2011-03-08): 3036 # Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00 3037 # this year. Nothing about the end date known so far (if that has 3038 # changed at all). 3039 # 3040 # Source: 3041 # http://granma.co.cu/2011/03/08/nacional/artic01.html 3042 # 3043 # Our info: 3044 # https://www.timeanddate.com/news/time/cuba-starts-dst-2011.html 3045 # 3046 # From Steffen Thorsen (2011-10-30) 3047 # Cuba will end DST two weeks later this year. Instead of going back 3048 # tonight, it has been delayed to 2011-11-13 at 01:00. 3049 # 3050 # One source (Spanish) 3051 # http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html 3052 # 3053 # Our page: 3054 # https://www.timeanddate.com/news/time/cuba-time-changes-2011.html 3055 # 3056 # From Steffen Thorsen (2012-03-01) 3057 # According to Radio Reloj, Cuba will start DST on Midnight between March 3058 # 31 and April 1. 3059 # 3060 # Radio Reloj has the following info (Spanish): 3061 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril 3062 # 3063 # Our info on it: 3064 # https://www.timeanddate.com/news/time/cuba-starts-dst-2012.html 3065 3066 # From Steffen Thorsen (2012-11-03): 3067 # Radio Reloj and many other sources report that Cuba is changing back 3068 # to standard time on 2012-11-04: 3069 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre 3070 # From Paul Eggert (2012-11-03): 3071 # For now, assume the future rule is first Sunday in November. 3072 3073 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3074 Rule Cuba 1928 only - Jun 10 0:00 1:00 D 3075 Rule Cuba 1928 only - Oct 10 0:00 0 S 3076 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D 3077 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S 3078 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D 3079 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S 3080 Rule Cuba 1965 only - Jun 1 0:00 1:00 D 3081 Rule Cuba 1965 only - Sep 30 0:00 0 S 3082 Rule Cuba 1966 only - May 29 0:00 1:00 D 3083 Rule Cuba 1966 only - Oct 2 0:00 0 S 3084 Rule Cuba 1967 only - Apr 8 0:00 1:00 D 3085 Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S 3086 Rule Cuba 1968 only - Apr 14 0:00 1:00 D 3087 Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D 3088 Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S 3089 Rule Cuba 1972 1974 - Oct 8 0:00 0 S 3090 Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S 3091 Rule Cuba 1978 only - May 7 0:00 1:00 D 3092 Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S 3093 Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D 3094 Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D 3095 Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D 3096 Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D 3097 Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S 3098 Rule Cuba 1996 only - Oct 6 0:00s 0 S 3099 Rule Cuba 1997 only - Oct 12 0:00s 0 S 3100 Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D 3101 Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S 3102 Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D 3103 Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D 3104 Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S 3105 Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D 3106 Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D 3107 Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D 3108 Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D 3109 Rule Cuba 2011 only - Nov 13 0:00s 0 S 3110 Rule Cuba 2012 only - Apr 1 0:00s 1:00 D 3111 Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S 3112 Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D 3113 3114 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3115 Zone America/Havana -5:29:28 - LMT 1890 3116 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT 3117 -5:00 Cuba C%sT 3118 3119 # Dominica 3120 # See America/Port_of_Spain. 3121 3122 # Dominican Republic 3123 3124 # From Steffen Thorsen (2000-10-30): 3125 # Enrique Morales reported to me that the Dominican Republic has changed the 3126 # time zone to Eastern Standard Time as of Sunday 29 at 2 am.... 3127 # http://www.listin.com.do/antes/261000/republica/princi.html 3128 3129 # From Paul Eggert (2000-12-04): 3130 # That URL (2000-10-26, in Spanish) says they planned to use US-style DST. 3131 3132 # From Rives McDow (2000-12-01): 3133 # Dominican Republic changed its mind and presidential decree on Tuesday, 3134 # November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the 3135 # Dominican Republic will be reverting to 8 hours from the International Date 3136 # Line, and will not be using DST in the foreseeable future. The reason they 3137 # decided to use DST was to be in synch with Puerto Rico, who was also going 3138 # to implement DST. When Puerto Rico didn't implement DST, the president 3139 # decided to revert. 3140 3141 3142 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3143 Rule DR 1966 only - Oct 30 0:00 1:00 EDT 3144 Rule DR 1967 only - Feb 28 0:00 0 EST 3145 Rule DR 1969 1973 - Oct lastSun 0:00 0:30 -0430 3146 Rule DR 1970 only - Feb 21 0:00 0 EST 3147 Rule DR 1971 only - Jan 20 0:00 0 EST 3148 Rule DR 1972 1974 - Jan 21 0:00 0 EST 3149 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3150 Zone America/Santo_Domingo -4:39:36 - LMT 1890 3151 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT 3152 -5:00 DR %s 1974 Oct 27 3153 -4:00 - AST 2000 Oct 29 2:00 3154 -5:00 US E%sT 2000 Dec 3 1:00 3155 -4:00 - AST 3156 3157 # El Salvador 3158 3159 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3160 Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D 3161 Rule Salv 1987 1988 - Sep lastSun 0:00 0 S 3162 # There are too many San Salvadors elsewhere, so use America/El_Salvador 3163 # instead of America/San_Salvador. 3164 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3165 Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador 3166 -6:00 Salv C%sT 3167 3168 # Grenada 3169 # Guadeloupe 3170 # St Barthélemy 3171 # St Martin (French part) 3172 # See America/Port_of_Spain. 3173 3174 # Guatemala 3175 # 3176 # From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen: 3177 # Diario Co Latino, at 3178 # <http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079>, 3179 # says in an article dated 2006-04-19 that the Guatemalan government had 3180 # decided on that date to advance official time by 60 minutes, to lessen the 3181 # impact of the elevated cost of oil.... Daylight saving time will last from 3182 # 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified). 3183 # From Paul Eggert (2006-06-22): 3184 # The Ministry of Energy and Mines, press release CP-15/2006 3185 # (2006-04-19), says DST ends at 24:00. See 3186 # http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf 3187 3188 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3189 Rule Guat 1973 only - Nov 25 0:00 1:00 D 3190 Rule Guat 1974 only - Feb 24 0:00 0 S 3191 Rule Guat 1983 only - May 21 0:00 1:00 D 3192 Rule Guat 1983 only - Sep 22 0:00 0 S 3193 Rule Guat 1991 only - Mar 23 0:00 1:00 D 3194 Rule Guat 1991 only - Sep 7 0:00 0 S 3195 Rule Guat 2006 only - Apr 30 0:00 1:00 D 3196 Rule Guat 2006 only - Oct 1 0:00 0 S 3197 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3198 Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 3199 -6:00 Guat C%sT 3200 3201 # Haiti 3202 # From Gwillim Law (2005-04-15): 3203 # Risto O. Nykänen wrote me that Haiti is now on DST. 3204 # I searched for confirmation, and I found a press release 3205 # on the Web page of the Haitian Consulate in Chicago (2005-03-31), 3206 # <http://www.haitianconsulate.org/time.doc>. Translated from French, it says: 3207 # 3208 # "The Prime Minister's Communication Office notifies the public in general 3209 # and the press in particular that, following a decision of the Interior 3210 # Ministry and the Territorial Collectivities [I suppose that means the 3211 # provinces], Haiti will move to Eastern Daylight Time in the night from next 3212 # Saturday the 2nd to Sunday the 3rd. 3213 # 3214 # "Consequently, the Prime Minister's Communication Office wishes to inform 3215 # the population that the country's clocks will be set forward one hour 3216 # starting at midnight. This provision will hold until the last Saturday in 3217 # October 2005. 3218 # 3219 # "Port-au-Prince, March 31, 2005" 3220 # 3221 # From Steffen Thorsen (2006-04-04): 3222 # I have been informed by users that Haiti observes DST this year like 3223 # last year, so the current "only" rule for 2005 might be changed to a 3224 # "max" rule or to last until 2006. (Who knows if they will observe DST 3225 # next year or if they will extend their DST like US/Canada next year). 3226 # 3227 # I have found this article about it (in French): 3228 # http://www.haitipressnetwork.com/news.cfm?articleID=7612 3229 # 3230 # The reason seems to be an energy crisis. 3231 3232 # From Stephen Colebourne (2007-02-22): 3233 # Some IATA info: Haiti won't be having DST in 2007. 3234 3235 # From Steffen Thorsen (2012-03-11): 3236 # According to several news sources, Haiti will observe DST this year, 3237 # apparently using the same start and end date as USA/Canada. 3238 # So this means they have already changed their time. 3239 # 3240 # http://www.alterpresse.org/spip.php?article12510 3241 # http://radiovision2000haiti.net/home/?p=13253 3242 # 3243 # From Arthur David Olson (2012-03-11): 3244 # The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to 3245 # 3:00 a.m. rather than the traditional Haitian jump at midnight. 3246 # Assume a US-style fall back as well. 3247 3248 # From Steffen Thorsen (2013-03-10): 3249 # It appears that Haiti is observing DST this year as well, same rules 3250 # as US/Canada. They did it last year as well, and it looks like they 3251 # are going to observe DST every year now... 3252 # 3253 # http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/ 3254 # http://www.canalplushaiti.net/?p=6714 3255 3256 # From Steffen Thorsen (2016-03-12): 3257 # Jean Antoine, editor of www.haiti-reference.com informed us that Haiti 3258 # are not going on DST this year. Several other resources confirm this: ... 3259 # https://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html 3260 # https://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/ 3261 # http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/ 3262 3263 # From Steffen Thorsen (2017-03-12): 3264 # We have received 4 mails from different people telling that Haiti 3265 # has started DST again today, and this source seems to confirm that, 3266 # I have not been able to find a more authoritative source: 3267 # https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html 3268 3269 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3270 Rule Haiti 1983 only - May 8 0:00 1:00 D 3271 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D 3272 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S 3273 # Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. 3274 # Go with IATA. 3275 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D 3276 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S 3277 Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D 3278 Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S 3279 Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D 3280 Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S 3281 Rule Haiti 2017 max - Mar Sun>=8 2:00 1:00 D 3282 Rule Haiti 2017 max - Nov Sun>=1 2:00 0 S 3283 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3284 Zone America/Port-au-Prince -4:49:20 - LMT 1890 3285 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT 3286 -5:00 Haiti E%sT 3287 3288 # Honduras 3289 # Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1. 3290 3291 # From Paul Eggert (2006-05-05): 3292 # worldtimezone.com reports a 2006-05-02 Spanish-language AP article 3293 # saying Honduras will start using DST midnight Saturday, effective 4 3294 # months until September. La Tribuna reported today 3295 # <http://www.latribuna.hn/99299.html> that Manuel Zelaya, the president 3296 # of Honduras, refused to back down on this. 3297 3298 # From Jesper Nørgaard Welen (2006-08-08): 3299 # It seems that Honduras has returned from DST to standard time this Monday at 3300 # 00:00 hours (prolonging Sunday to 25 hours duration). 3301 # http://www.worldtimezone.com/dst_news/dst_news_honduras04.html 3302 3303 # From Paul Eggert (2006-08-08): 3304 # Also see Diario El Heraldo, The country returns to standard time (2006-08-08). 3305 # http://www.elheraldo.hn/nota.php?nid=54941&sec=12 3306 # It mentions executive decree 18-2006. 3307 3308 # From Steffen Thorsen (2006-08-17): 3309 # Honduras will observe DST from 2007 to 2009, exact dates are not 3310 # published, I have located this authoritative source: 3311 # http://www.presidencia.gob.hn/noticia.aspx?nId=47 3312 3313 # From Steffen Thorsen (2007-03-30): 3314 # http://www.laprensahn.com/pais_nota.php?id04962=7386 3315 # So it seems that Honduras will not enter DST this year.... 3316 3317 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3318 Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D 3319 Rule Hond 1987 1988 - Sep lastSun 0:00 0 S 3320 Rule Hond 2006 only - May Sun>=1 0:00 1:00 D 3321 Rule Hond 2006 only - Aug Mon>=1 0:00 0 S 3322 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3323 Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr 3324 -6:00 Hond C%sT 3325 # 3326 # Great Swan I ceded by US to Honduras in 1972 3327 3328 # Jamaica 3329 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an 3330 # unspecified official document, and says "This time is used throughout the 3331 # island". Go with Milne. Round to the nearest second as required by zic. 3332 # 3333 # Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but 3334 # Lance Neita writes that Prime Minister Michael Manley decreed it January 5. 3335 # Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that 3336 # Manley's supporters associated this act with Manley's nickname "Joshua" 3337 # (recall that in the Bible the sun stood still at Joshua's request), 3338 # and with the Rod of Correction which Manley said he had received from 3339 # Haile Selassie, Emperor of Ethiopia. See: 3340 # Neita L. The politician in all of us. Jamaica Observer 2014-09-20 3341 # http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647 3342 # 3343 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3344 Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston 3345 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3346 -5:00 - EST 1974 3347 -5:00 US E%sT 1984 3348 -5:00 - EST 3349 3350 # Martinique 3351 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3352 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France 3353 -4:04:20 - FFMT 1911 May # Fort-de-France MT 3354 -4:00 - AST 1980 Apr 6 3355 -4:00 1:00 ADT 1980 Sep 28 3356 -4:00 - AST 3357 3358 # Montserrat 3359 # See America/Port_of_Spain. 3360 3361 # Nicaragua 3362 # 3363 # This uses Shanks & Pottenger for times before 2005. 3364 # 3365 # From Steffen Thorsen (2005-04-12): 3366 # I've got reports from 8 different people that Nicaragua just started 3367 # DST on Sunday 2005-04-10, in order to save energy because of 3368 # expensive petroleum. The exact end date for DST is not yet 3369 # announced, only "September" but some sites also say "mid-September". 3370 # Some background information is available on the President's official site: 3371 # http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm 3372 # The Decree, no 23-2005 is available here: 3373 # 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 3374 # 3375 # From Paul Eggert (2005-05-01): 3376 # The decree doesn't say anything about daylight saving, but for now let's 3377 # assume that it is daylight saving.... 3378 # 3379 # From Gwillim Law (2005-04-21): 3380 # The Associated Press story on the time change, which can be found at 3381 # http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html 3382 # and elsewhere, says (fifth paragraph, translated from Spanish): "The last 3383 # time that a change of clocks was applied to save energy was in the year 2000 3384 # during the Arnoldo Alemán administration."... 3385 # The northamerica file says that Nicaragua has been on UTC-6 continuously 3386 # since December 1998. I wasn't able to find any details of Nicaraguan time 3387 # changes in 2000. Perhaps a note could be added to the northamerica file, to 3388 # the effect that we have indirect evidence that DST was observed in 2000. 3389 # 3390 # From Jesper Nørgaard Welen (2005-11-02): 3391 # Nicaragua left DST the 2005-10-02 at 00:00 (local time). 3392 # http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm 3393 # (2005-09-26) 3394 # 3395 # From Jesper Nørgaard Welen (2006-05-05): 3396 # http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410 3397 # (my informal translation) 3398 # By order of the president of the republic, Enrique Bolaños, Nicaragua 3399 # advanced by sixty minutes their official time, yesterday at 2 in the 3400 # morning, and will stay that way until 30th of September. 3401 # 3402 # From Jesper Nørgaard Welen (2006-09-30): 3403 # http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf 3404 # My informal translation runs: 3405 # The natural sun time is restored in all the national territory, in that the 3406 # time is returned one hour at 01:00 am of October 1 of 2006. 3407 # 3408 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 3409 Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D 3410 Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S 3411 Rule Nic 2005 only - Apr 10 0:00 1:00 D 3412 Rule Nic 2005 only - Oct Sun>=1 0:00 0 S 3413 Rule Nic 2006 only - Apr 30 2:00 1:00 D 3414 Rule Nic 2006 only - Oct Sun>=1 1:00 0 S 3415 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3416 Zone America/Managua -5:45:08 - LMT 1890 3417 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? 3418 -6:00 - CST 1973 May 3419 -5:00 - EST 1975 Feb 16 3420 -6:00 Nic C%sT 1992 Jan 1 4:00 3421 -5:00 - EST 1992 Sep 24 3422 -6:00 - CST 1993 3423 -5:00 - EST 1997 3424 -6:00 Nic C%sT 3425 3426 # Panama 3427 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3428 Zone America/Panama -5:18:08 - LMT 1890 3429 -5:19:36 - CMT 1908 Apr 22 # Colón Mean Time 3430 -5:00 - EST 3431 Link America/Panama America/Cayman 3432 3433 # Puerto Rico 3434 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'. 3435 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3436 Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan 3437 -4:00 - AST 1942 May 3 3438 -4:00 US A%sT 1946 3439 -4:00 - AST 3440 3441 # St Kitts-Nevis 3442 # St Lucia 3443 # See America/Port_of_Spain. 3444 3445 # St Pierre and Miquelon 3446 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'. 3447 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3448 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre 3449 -4:00 - AST 1980 May 3450 -3:00 - -03 1987 3451 -3:00 Canada -03/-02 3452 3453 # St Vincent and the Grenadines 3454 # See America/Port_of_Spain. 3455 3456 # Turks and Caicos 3457 # 3458 # From Chris Dunn in 3459 # https://bugs.debian.org/415007 3460 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the 3461 # daylight saving dates for time changes have been adjusted to match 3462 # the recent U.S. change of dates. 3463 # 3464 # From Brian Inglis (2007-04-28): 3465 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26] 3466 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three 3467 # rows before that there is an out of date entry for Oct: 3468 # "Eastern Standard Times Begins 2007 3469 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time" 3470 # indicating that the normal ET rules are followed. 3471 # 3472 # From Paul Eggert (2014-08-19): 3473 # The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See: 3474 # http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm 3475 # Model this as a switch from EST/EDT to AST ... 3476 # From Chris Walton (2014-11-04): 3477 # ... the TCI government appears to have delayed the switch to 3478 # "permanent daylight saving time" by one year.... 3479 # http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm 3480 # 3481 # From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen: 3482 # ... agreed to the reintroduction in TCI of Daylight Saving Time (DST) 3483 # during the summer months and Standard Time, also known as Local 3484 # Time, during the winter months with effect from April 2018 ... 3485 # https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3 3486 # 3487 # From Paul Eggert (2017-08-26): 3488 # The date of effect of the spring 2018 change appears to be March 11, 3489 # which makes more sense. See: Hamilton D. Time change back 3490 # by March 2018 for TCI. Magnetic Media. 2017-08-25. 3491 # http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/ 3492 # 3493 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 3494 Zone America/Grand_Turk -4:44:32 - LMT 1890 3495 -5:07:10 - KMT 1912 Feb # Kingston Mean Time 3496 -5:00 - EST 1979 3497 -5:00 US E%sT 2015 Nov Sun>=1 2:00 3498 -4:00 - AST 2018 Mar 11 3:00 3499 -5:00 US E%sT 3500 3501 # British Virgin Is 3502 # Virgin Is 3503 # See America/Port_of_Spain. 3504 3505 3506 # Local Variables: 3507 # coding: utf-8 3508 # End: