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