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 # 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 Joseph Gallant citing
137 # George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
138 # At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
139 # to switch to London for Attlee's address, but the American people
140 # never got to hear his speech live. According to one press account,
141 # CBS' Bob Trout was first to announce the word of Japan's surrender,
142 # but a few seconds later, NBC, ABC and Mutual also flashed the word
143 # of surrender, all of whom interrupting the bells of Big Ben in
144 # London which were to precede Mr. Attlee's speech.
145
146 # From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
147 # Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
148 #
149 # ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
150 # Any announcement from Asia would reach St. John's New York newsroom on a
151 # wire service teletype machine, which had prescribed signals for major news.
152 # Associated Press, for example, would ring five bells before spewing out
153 # typed copy of an important story, and 10 bells for news "of transcendental
154 # importance."
263 # http://uscode.house.gov/statviewer.htm?volume=80&page=108
264 # Although the 1918 names were officially "United States Standard
265 # Eastern Time" and similarly for "Central", "Mountain", "Pacific",
266 # and "Alaska", in practice "Standard" was placed just before "Time",
267 # as codified in 1966. In practice, Alaska time was abbreviated "AST"
268 # before 1968. Summarizing the 1967 name changes:
269 # 1918 names 1967 names
270 # -08 Standard Pacific Time (PST) Pacific standard time (PST)
271 # -09 (unofficial) Yukon (YST) Yukon standard time (YST)
272 # -10 Standard Alaska Time (AST) Alaska-Hawaii standard time (AHST)
273 # -11 (unofficial) Nome (NST) Bering standard time (BST)
274 #
275 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
276 # Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time"
277 # for time in Guam and the Northern Marianas. See the file "australasia".
278 #
279 # From Paul Eggert (2015-04-17):
280 # HST and HDT are standardized abbreviations for Hawaii-Aleutian
281 # standard and daylight times. See section 9.47 (p 234) of the
282 # U.S. Government Printing Office Style Manual (2008)
283 # http://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf
284
285 # From Arthur David Olson, 2005-08-09
286 # The following was signed into law on 2005-08-08.
287 #
288 # H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
289 # (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15
290 # U.S.C. 260a(a)) is amended--
291 # (1) by striking "first Sunday of April" and inserting "second
292 # Sunday of March"; and
293 # (2) by striking "last Sunday of October" and inserting "first
294 # Sunday of November'.
295 # (b) Effective Date.--Subsection (a) shall take effect 1 year after the
296 # date of enactment of this Act or March 1, 2007, whichever is later.
297 # (c) Report to Congress.--Not later than 9 months after the effective
298 # date stated in subsection (b), the Secretary shall report to Congress
299 # on the impact of this section on energy consumption in the United
300 # States.
301 # (d) Right to Revert.--Congress retains the right to revert the
302 # Daylight Saving Time back to the 2005 time schedules once the
303 # Department study is complete.
352 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
353 Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
354 -5:00 US E%sT 1920
355 -5:00 NYC E%sT 1942
356 -5:00 US E%sT 1946
357 -5:00 NYC E%sT 1967
358 -5:00 US E%sT
359
360 # US central time, represented by Chicago
361
362 # Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
363 # Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
364 # Washington counties), Illinois, western Indiana
365 # (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
366 # Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
367 # Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
368 # Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
369 # western Tennessee, most of Texas, Wisconsin
370
371 # From Larry M. Smith (2006-04-26) re Wisconsin:
372 # http://www.legis.state.wi.us/statutes/Stat0175.pdf ...
373 # is currently enforced at the 01:00 time of change. Because the local
374 # "bar time" in the state corresponds to 02:00, a number of citations
375 # are issued for the "sale of class 'B' alcohol after prohibited
376 # hours" within the deviated hour of this change every year....
377 #
378 # From Douglas R. Bomberg (2007-03-12):
379 # Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
380 # Statue 175 closer in synch with the US Congress' intent....
381 # http://www.legis.state.wi.us/2007/data/acts/07Act3.pdf
382
383 # From an email administrator of the City of Fort Pierre, SD (2015-12-21):
384 # Fort Pierre is technically located in the Mountain time zone as is
385 # the rest of Stanley County. Most of Stanley County and Fort Pierre
386 # uses the Central time zone due to doing most of their business in
387 # Pierre so it simplifies schedules. I have lived in Stanley County
388 # all my life and it has been that way since I can remember. (43 years!)
389 #
390 # From Paul Eggert (2015-12-25):
391 # Assume this practice predates 1970, so Fort Pierre can use America/Chicago.
392
393 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
394 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
395 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
396 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
397 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
398 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
399 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
400 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
401 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
408 -6:00 US C%sT
409 # Oliver County, ND switched from mountain to central time on 1992-10-25.
410 Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
411 -7:00 US M%sT 1992 Oct 25 2:00
412 -6:00 US C%sT
413 # Morton County, ND, switched from mountain to central time on
414 # 2003-10-26, except for the area around Mandan which was already central time.
415 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
416 # Officially this switch also included part of Sioux County, and
417 # Jones, Mellette, and Todd Counties in South Dakota;
418 # but in practice these other counties were already observing central time.
419 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
420 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
421 -7:00 US M%sT 2003 Oct 26 2:00
422 -6:00 US C%sT
423
424 # From Josh Findley (2011-01-21):
425 # ...it appears that Mercer County, North Dakota, changed from the
426 # mountain time zone to the central time zone at the last transition from
427 # daylight-saving to standard time (on Nov. 7, 2010):
428 # http://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
429 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
430
431 # From Andy Lipscomb (2011-01-24):
432 # ...according to the Census Bureau, the largest city is Beulah (although
433 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
434 # largest city in Mercer County). Google Maps places Beulah's city hall
435 # at 47 degrees 15' 51" N, 101 degrees 46' 40" W, which yields an offset
436 # of 6h47'07".
437
438 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
439 -7:00 US M%sT 2010 Nov 7 2:00
440 -6:00 US C%sT
441
442 # US mountain time, represented by Denver
443 #
444 # Colorado, far western Kansas, Montana, western
445 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
446 # New Mexico, southwestern North Dakota,
447 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
448 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
459 -7:00 Denver M%sT 1942
460 -7:00 US M%sT 1946
461 -7:00 Denver M%sT 1967
462 -7:00 US M%sT
463
464 # US Pacific time, represented by Los Angeles
465 #
466 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
467 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
468 # north of the Salmon River, and the towns of Burgdorf and Warren),
469 # Nevada (except West Wendover), Oregon (except the northern 3/4 of
470 # Malheur county), and Washington
471
472 # From Paul Eggert (2016-08-20):
473 # In early February 1948, in response to California's electricity shortage,
474 # PG&E changed power frequency from 60 to 59.5 Hz during daylight hours,
475 # causing electric clocks to lose six minutes per day. (This did not change
476 # legal time, and is not part of the data here.) See:
477 # Ross SA. An energy crisis from the past: Northern California in 1948.
478 # Working Paper No. 8, Institute of Governmental Studies, UC Berkeley,
479 # 1973-11. http://escholarship.org/uc/item/8x22k30c
480 #
481 # In another measure to save electricity, DST was instituted from 1948-03-14
482 # at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move
483 # the fallback transition earlier. See pages 3-4 of:
484 # http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf
485 #
486 # In response:
487 #
488 # Governor Warren received a torrent of objecting mail, and it is not too much
489 # to speculate that the objections to Daylight Saving Time were one important
490 # factor in the defeat of the Dewey-Warren Presidential ticket in California.
491 # -- Ross, p 25
492 #
493 # On December 8 the governor exercised the option, setting the date to January 1
494 # (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01).
495 #
496 # Despite the controversy, in 1949 California voters approved Proposition 12,
497 # which established DST from April's last Sunday at 01:00 until September's
498 # last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed
499 # the fall-back date to October's last Sunday. See:
500 # http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props
501 # http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props
502 #
503 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
504 Rule CA 1948 only - Mar 14 2:01 1:00 D
505 Rule CA 1949 only - Jan 1 2:00 0 S
506 Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D
507 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
508 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
509 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
510 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
511 -8:00 US P%sT 1946
512 -8:00 CA P%sT 1967
513 -8:00 US P%sT
514
515 # Alaska
516 # AK%sT is the modern abbreviation for -09 per USNO.
517 #
518 # From Paul Eggert (2001-05-30):
519 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
520 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
521 # This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
522 # also a Friday. Include only the time zone part of this transition,
523 # ignoring the switch from Julian to Gregorian, since we can't represent
524 # the Julian calendar.
525 #
526 # As far as we know, none of the exact locations mentioned below were
527 # permanently inhabited in 1867 by anyone using either calendar.
528 # (Yakutat was colonized by the Russians in 1799, but the settlement
529 # was destroyed in 1805 by a Yakutat-kon war party.) However, there
530 # were nearby inhabitants in some cases and for our purposes perhaps
531 # it's best to simply use the official transition.
532
533 # From Paul Eggert (2014-07-18):
534 # One opinion of the early-1980s turmoil in Alaska over time zones and
535 # daylight saving time appeared as graffiti on a Juneau airport wall:
536 # "Welcome to Juneau. Please turn your watch back to the 19th century."
537 # See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01.
538 # http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html
539 #
540 # Steve Ferguson (2011-01-31) referred to the following source:
541 # Norris F. Keeping time in Alaska: national directives, local response.
542 # Alaska History 2001;16(1-2).
543 # http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/
544
545 # From Arthur David Olson (2011-02-01):
546 # Here's database-relevant material from the 2001 "Alaska History" article:
547 #
548 # On September 20 [1979]...DOT...officials decreed that on April 27,
549 # 1980, Juneau and other nearby communities would move to Yukon Time.
550 # Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
551 # Pacific Time.
564 # Nation.)
565
566 # From Arthur David Olson (2011-02-09):
567 # I just spoke by phone with a staff member at the Metlakatla Indian
568 # Community office (using contact information available at
569 # http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
570 # It's shortly after 1:00 here on the east coast of the United States;
571 # the staffer said it was shortly after 10:00 there. When I asked whether
572 # that meant they were on Pacific time, they said no - they were on their
573 # own time. I asked about daylight saving; they said it wasn't used. I
574 # did not inquire about practices in the past.
575
576 # From Arthur David Olson (2011-08-17):
577 # For lack of better information, assume that Metlakatla's
578 # abandonment of use of daylight saving resulted from the 1983 vote.
579
580 # From Steffen Thorsen (2015-11-09):
581 # It seems Metlakatla did go off PST on Sunday, November 1, changing
582 # their time to AKST and are going to follow Alaska's DST, switching
583 # between AKST and AKDT from now on....
584 # http://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/
585
586 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
587 Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
588 -8:57:41 - LMT 1900 Aug 20 12:00
589 -8:00 - PST 1942
590 -8:00 US P%sT 1946
591 -8:00 - PST 1969
592 -8:00 US P%sT 1980 Apr 27 2:00
593 -9:00 US Y%sT 1980 Oct 26 2:00
594 -8:00 US P%sT 1983 Oct 30 2:00
595 -9:00 US Y%sT 1983 Nov 30
596 -9:00 US AK%sT
597 Zone America/Sitka 14:58:47 - LMT 1867 Oct 18
598 -9:01:13 - LMT 1900 Aug 20 12:00
599 -8:00 - PST 1942
600 -8:00 US P%sT 1946
601 -8:00 - PST 1969
602 -8:00 US P%sT 1983 Oct 30 2:00
603 -9:00 US Y%sT 1983 Nov 30
604 -9:00 US AK%sT
605 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18
606 -8:46:18 - LMT 1900 Aug 20 12:00
607 -8:00 - PST 1942
608 -8:00 US P%sT 1946
609 -8:00 - PST 1969
610 -8:00 US P%sT 1983 Oct 30 2:00
611 -8:00 - PST 2015 Nov 1 2:00
612 -9:00 US AK%sT
613 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
614 -9:18:55 - LMT 1900 Aug 20 12:00
615 -9:00 - YST 1942
616 -9:00 US Y%sT 1946
617 -9:00 - YST 1969
618 -9:00 US Y%sT 1983 Nov 30
619 -9:00 US AK%sT
620 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
621 -9:59:36 - LMT 1900 Aug 20 12:00
622 -10:00 - AST 1942
623 -10:00 US A%sT 1967 Apr
624 -10:00 - AHST 1969
625 -10:00 US AH%sT 1983 Oct 30 2:00
626 -9:00 US Y%sT 1983 Nov 30
627 -9:00 US AK%sT
628 Zone America/Nome 12:58:21 - LMT 1867 Oct 18
629 -11:01:38 - LMT 1900 Aug 20 12:00
630 -11:00 - NST 1942
631 -11:00 US N%sT 1946
632 -11:00 - NST 1967 Apr
633 -11:00 - BST 1969
634 -11:00 US B%sT 1983 Oct 30 2:00
635 -9:00 US Y%sT 1983 Nov 30
636 -9:00 US AK%sT
637 Zone America/Adak 12:13:21 - LMT 1867 Oct 18
638 -11:46:38 - LMT 1900 Aug 20 12:00
639 -11:00 - NST 1942
640 -11:00 US N%sT 1946
641 -11:00 - NST 1967 Apr
642 -11:00 - BST 1969
643 -11:00 US B%sT 1983 Oct 30 2:00
644 -10:00 US AH%sT 1983 Nov 30
645 -10:00 US H%sT
646 # The following switches don't quite make our 1970 cutoff.
647 #
648 # Shanks writes that part of southwest Alaska (e.g. Aniak)
649 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
650 # and another part (e.g. Akiak) made the same switch five weeks later.
651 #
652 # From David Flater (2004-11-09):
653 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
654 # Historic Preservation Commission, provided this information, which
655 # suggests that Unalaska deviated from statutory time from early 1967
656 # possibly until 1983:
657 #
658 # Minutes of the Unalaska City Council Meeting, January 10, 1967:
659 # "Except for St. Paul and Akutan, Unalaska is the only important
660 # location not on Alaska Standard Time. The following resolution was
661 # made by William Robinson and seconded by Henry Swanson: Be it
662 # resolved that the City of Unalaska hereby goes to Alaska Standard
663 # Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
664 # January 14, Alaska Standard Time.) This resolution was passed with
665 # three votes for and one against."
666
667 # Hawaii
668
669 # From Arthur David Olson (2010-12-09):
670 # "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
671 # of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
672 # the article is available at
673 # http://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
674 # and indicates that standard time was adopted effective noon, January
675 # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
676 # saving for the period between the last Sunday of each April and the
677 # last Sunday of each September, but less than a month later repealed the
678 # act," (page 220), that year-round daylight saving time was in effect
679 # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
680 # when clocks changed) and that clocks were changed by 30 minutes
681 # effective the second Sunday of June, 1947 (page 219, with no time of
682 # day given for when clocks changed). A footnote for the 1933 changes
683 # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
684 # and Act 163 (approved 21 May 1933)."
685
686 # From Arthur David Olson (2011-01-19):
687 # The following is from "Laws of the Territory of Hawaii Passed by the
688 # Seventeenth Legislature: Regular Session 1933," available (as of
689 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act
690 # 90...At 2 o'clock ante meridian of the last Sunday in April of each
691 # year, the standard time of this Territory shall be advanced one
692 # hour...This Act shall take effect upon its approval. Approved this 26th
693 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
752 # See America/Denver for a zone appropriate for the Navajo Nation.
753
754 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
755 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
756 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
757 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
758 # Teton, Twin Falls, Valley, Washington counties, and the southern
759 # quarter of Idaho county) and eastern Oregon (most of Malheur County)
760 # switched four weeks late in 1974.
761 #
762 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
763 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
764 -8:00 US P%sT 1923 May 13 2:00
765 -7:00 US M%sT 1974
766 -7:00 - MST 1974 Feb 3 2:00
767 -7:00 US M%sT
768
769 # Indiana
770 #
771 # For a map of Indiana's time zone regions, see:
772 # http://en.wikipedia.org/wiki/Time_in_Indiana
773 #
774 # From Paul Eggert (2007-08-17):
775 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
776 # with the following exceptions:
777 #
778 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
779 # Vanderburgh, and Warrick counties have been like America/Chicago.
780 #
781 # - Dearborn and Ohio counties have been like America/New_York.
782 #
783 # - Clark, Floyd, and Harrison counties have been like
784 # America/Kentucky/Louisville.
785 #
786 # - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
787 # and Switzerland counties have their own time zone histories as noted below.
788 #
789 # Shanks partitioned Indiana into 345 regions, each with its own time history,
790 # and wrote "Even newspaper reports present contradictory information."
791 # Those Hoosiers! Such a flighty and changeable people!
792 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
979 # From Lake Cumberland LIFE
980 # http://www.lake-cumberland.com/life/archive/news990129time.shtml
981 # (1999-01-29) via WKYM-101.7:
982 # Clinton County has joined Wayne County in asking the DoT to change from
983 # the Central to the Eastern time zone.... The Wayne County government made
984 # the same request in December. And while Russell County officials have not
985 # taken action, the majority of respondents to a poll conducted there in
986 # August indicated they would like to change to "fast time" also.
987 # The three Lake Cumberland counties are the farthest east of any U.S.
988 # location in the Central time zone.
989 #
990 # From Rich Wales (2000-08-29):
991 # After prolonged debate, and despite continuing deep differences of opinion,
992 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
993 # (-0500) time. They won't "fall back" this year. See Sara Shipley,
994 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
995 #
996 # From Paul Eggert (2001-07-16):
997 # The final rule was published in the
998 # Federal Register 65, 160 (2000-08-17), pp 50154-50158.
999 # http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22
1000 #
1001 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
1002 -6:00 US C%sT 1946
1003 -6:00 - CST 1968
1004 -6:00 US C%sT 2000 Oct 29 2:00
1005 -5:00 US E%sT
1006
1007
1008 # From Rives McDow (2000-08-30):
1009 # Here ... are all the changes in the US since 1985.
1010 # Kearny County, KS (put all of county on central;
1011 # previously split between MST and CST) ... 1990-10
1012 # Starke County, IN (from CST to EST) ... 1991-10
1013 # Oliver County, ND (from MST to CST) ... 1992-10
1014 # West Wendover, NV (from PST TO MST) ... 1999-10
1015 # Wayne County, KY (from CST to EST) ... 2000-10
1016 #
1017 # From Paul Eggert (2001-07-17):
1018 # We don't know where the line used to be within Kearny County, KS,
1019 # so omit that change for now.
1020 # See America/Indiana/Knox for the Starke County, IN change.
1021 # See America/North_Dakota/Center for the Oliver County, ND change.
1022 # West Wendover, NV officially switched from Pacific to mountain time on
1023 # 1999-10-31. See the
1024 # Federal Register 64, 203 (1999-10-21), pp 56705-56707.
1025 # http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15
1026 # However, the Federal Register says that West Wendover already operated
1027 # on mountain time, and the rule merely made this official;
1028 # hence a separate tz entry is not needed.
1029
1030 # Michigan
1031 #
1032 # From Bob Devine (1988-01-28):
1033 # Michigan didn't observe DST from 1968 to 1973.
1034 #
1035 # From Paul Eggert (1999-03-31):
1036 # Shanks writes that Michigan started using standard time on 1885-09-18,
1037 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
1038 # that Detroit kept
1039 #
1040 # local time until 1900 when the City Council decreed that clocks should
1041 # be put back twenty-eight minutes to Central Standard Time. Half the
1042 # city obeyed, half refused. After considerable debate, the decision
1043 # was rescinded and the city reverted to Sun time. A derisive offer to
1044 # erect a sundial in front of the city hall was referred to the
1045 # Committee on Sewers. Then, in 1905, Central time was adopted
1046 # by city vote.
1047 #
1048 # This story is too entertaining to be false, so go with Howse over Shanks.
1049 #
1050 # From Paul Eggert (2001-03-06):
1051 # Garland (1927) writes "Cleveland and Detroit advanced their clocks
1052 # one hour in 1914." This change is not in Shanks. We have no more
1053 # info, so omit this for now.
1054 #
1055 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
1056 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
1057 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
1058 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
1059 Rule Detroit 1967 only - Jun 14 2:00 1:00 D
1060 Rule Detroit 1967 only - Oct lastSun 2:00 0 S
1061 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1062 Zone America/Detroit -5:32:11 - LMT 1905
1063 -6:00 - CST 1915 May 15 2:00
1064 -5:00 - EST 1942
1065 -5:00 US E%sT 1946
1066 -5:00 Detroit E%sT 1973
1067 -5:00 US E%sT 1975
1068 -5:00 - EST 1975 Apr 27 2:00
1069 -5:00 US E%sT
1070 #
1071 # Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
1072 # switched from EST to CST/CDT in 1973.
1073 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
1074 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
1075 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
1076 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
1077 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
1078 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1079 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
1080 -6:00 US C%sT 1946
1104 # Unfortunately this book contains many errors and cites no sources.
1105 #
1106 # Many years ago Gwillim Law wrote that a good source
1107 # for time zone data was the International Air Transport
1108 # Association's Standard Schedules Information Manual (IATA SSIM),
1109 # published semiannually. Law sent in several helpful summaries
1110 # of the IATA's data after 1990. Except where otherwise noted,
1111 # IATA SSIM is the source for entries after 1990.
1112 #
1113 # Other sources occasionally used include:
1114 #
1115 # Edward W. Whitman, World Time Differences,
1116 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1117 # which I found in the UCLA library.
1118 #
1119 # William Willett, The Waste of Daylight, 19th edition
1120 # <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
1121 # [PDF] (1914-03)
1122 #
1123 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1124 # <http://www.jstor.org/stable/1774359>.
1125 #
1126 # See the 'europe' file for Greenland.
1127
1128 # Canada
1129
1130 # From Alain LaBonté (1994-11-14):
1131 # I post here the time zone abbreviations standardized in Canada
1132 # for both English and French in the CAN/CSA-Z234.4-89 standard....
1133 #
1134 # UTC Standard time Daylight saving time
1135 # offset French English French English
1136 # -2:30 - - HAT NDT
1137 # -3 - - HAA ADT
1138 # -3:30 HNT NST - -
1139 # -4 HNA AST HAE EDT
1140 # -5 HNE EST HAC CDT
1141 # -6 HNC CST HAR MDT
1142 # -7 HNR MST HAP PDT
1143 # -8 HNP PST HAY YDT
1144 # -9 HNY YST - -
1150 # C: du Centre Central
1151 # E: de l'Est Eastern
1152 # M: Mountain
1153 # N: Newfoundland
1154 # P: du Pacifique Pacific
1155 # R: des Rocheuses
1156 # T: de Terre-Neuve
1157 # Y: du Yukon Yukon
1158 #
1159 # From Paul Eggert (1994-11-22):
1160 # Alas, this sort of thing must be handled by localization software.
1161
1162 # Unless otherwise specified, the data entries for Canada are all from Shanks
1163 # & Pottenger.
1164
1165 # From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1166 # 2007-03-01):
1167 # The British Columbia government announced yesterday that it will
1168 # adjust daylight savings next year to align with changes in the
1169 # U.S. and the rest of Canada....
1170 # http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
1171 # ...
1172 # Nova Scotia
1173 # Daylight saving time will be extended by four weeks starting in 2007....
1174 # http://www.gov.ns.ca/just/regulations/rg2/2006/ma1206.pdf
1175 #
1176 # [For New Brunswick] the new legislation dictates that the time change is to
1177 # be done at 02:00 instead of 00:01.
1178 # http://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1179 # ...
1180 # Manitoba has traditionally changed the clock every fall at 03:00.
1181 # As of 2006, the transition is to take place one hour earlier at 02:00.
1182 # http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1183 # ...
1184 # [Alberta, Ontario, Quebec] will follow US rules.
1185 # http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
1186 # http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
1187 # http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
1188 # ...
1189 # P.E.I. will follow US rules....
1190 # http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
1191 # ...
1192 # Province of Newfoundland and Labrador....
1193 # http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1194 # ...
1195 # Yukon
1196 # http://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1197 # ...
1198 # N.W.T. will follow US rules. Whoever maintains the government web site
1199 # does not seem to believe in bookmarks. To see the news release, click the
1200 # following link and search for "Daylight Savings Time Change". Press the
1201 # "Daylight Savings Time Change" link; it will fire off a popup using
1202 # JavaScript.
1203 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1204 # ...
1205 # Nunavut
1206 # An amendment to the Interpretation Act was registered on February 19/2007....
1207 # http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1208
1209 # From Paul Eggert (2014-10-18):
1210 # H. David Matthews and Mary Vincent's map
1211 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
1212 # http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp
1213 # contains detailed boundaries for regions observing nonstandard
1214 # time and daylight saving time arrangements in Canada circa 1998.
1215 #
1216 # National Research Council Canada maintains info about time zones and DST.
1217 # http://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html
1218 # http://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5
1219 # Its unofficial information is often taken from Matthews and Vincent.
1220
1221 # From Paul Eggert (2006-06-27):
1222 # For now, assume all of DST-observing Canada will fall into line with the
1223 # new US DST rules,
1224
1225 # From Chris Walton (2011-12-01)
1226 # In the first of Tammy Hardwick's articles
1227 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1228 # she quotes the Friday November 1/1918 edition of the Creston Review.
1229 # The quote includes these two statements:
1230 # 'Sunday the CPR went back to the old system of time...'
1231 # '... The daylight saving scheme was dropped all over Canada at the same time,'
1232 # These statements refer to a transition from daylight time to standard time
1233 # that occurred nationally on Sunday October 27/1918. This transition was
1234 # also documented in the Saturday October 26/1918 edition of the Toronto Star.
1235
1236 # In light of that evidence, we alter the date from the earlier believed
1237 # Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1238 # than Thursday) in all Canadian rulesets.
1239
1240 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1241 Rule Canada 1918 only - Apr 14 2:00 1:00 D
1242 Rule Canada 1918 only - Oct 27 2:00 0 S
1243 Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1244 Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1245 Rule Canada 1945 only - Sep 30 2:00 0 S
1246 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1247 Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1248 Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1249 Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1250 Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1251
1252
1253 # Newfoundland and Labrador
1254
1255 # From Paul Eggert (2000-10-02):
1256 # Matthews and Vincent (1998) write that Labrador should use NST/NDT,
1257 # but the only part of Labrador that follows the rules is the
1258 # southeast corner, including Port Hope Simpson and Mary's Harbour,
1259 # but excluding, say, Black Tickle.
1260
1261 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1262 Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1263 Rule StJohns 1917 only - Sep 17 2:00 0 S
1264 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1265 Rule StJohns 1919 only - May 5 23:00 1:00 D
1266 Rule StJohns 1919 only - Aug 12 23:00 0 S
1267 # For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1268 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1269 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1270 # For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1271 # Pottenger.
1272 Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1273 Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1274 # Whitman gives the following transitions:
1275 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1276 # but go with Shanks & Pottenger and assume they used Canadian rules.
1277 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1278 # Apr 30 - Sep 24; go with Shanks & Pottenger.
1279 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1439 -4:00 Moncton A%sT 1942
1440 -4:00 Canada A%sT 1946
1441 -4:00 Moncton A%sT 1973
1442 -4:00 Canada A%sT 1993
1443 -4:00 Moncton A%sT 2007
1444 -4:00 Canada A%sT
1445
1446 # Quebec
1447
1448 # From Paul Eggert (2015-03-24):
1449 # See America/Toronto for most of Quebec, including Montreal.
1450 #
1451 # Matthews and Vincent (1998) also write that Quebec east of the -63
1452 # meridian is supposed to observe AST, but residents as far east as
1453 # Natashquan use EST/EDT, and residents east of Natashquan use AST.
1454 # The Quebec department of justice writes in
1455 # "The situation in Minganie and Basse-Côte-Nord"
1456 # http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1457 # that the coastal strip from just east of Natashquan to Blanc-Sablon
1458 # observes Atlantic standard time all year round.
1459 # http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1460 # says this common practice was codified into law as of 2007.
1461 # For lack of better info, guess this practice began around 1970, contra to
1462 # Shanks & Pottenger who have this region observing AST/ADT.
1463
1464 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1465 Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1466 -4:00 Canada A%sT 1970
1467 -4:00 - AST
1468
1469 # Ontario
1470
1471 # From Paul Eggert (2006-07-09):
1472 # Shanks & Pottenger write that since 1970 most of Ontario has been like
1473 # Toronto.
1474 # Thunder Bay skipped DST in 1973.
1475 # Many smaller locales did not observe peacetime DST until 1974;
1476 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1477 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1478
1479 # From Mark Brader (2003-07-26):
1480 # [According to the Toronto Star] Orillia, Ontario, adopted DST
1481 # effective Saturday, 1912-06-22, 22:00; the article mentions that
1482 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1483 # have already done so. In Orillia DST was to run until Saturday,
1484 # 1912-08-31 (no time mentioned), but it was met with considerable
1485 # hostility from certain segments of the public, and was revoked after
1486 # only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but
1487 # presumably that should be -07-06. (1912-06-19, -07-12; also letters
1488 # earlier in June).
1489 #
1490 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1491
1492 # From Paul Eggert (1997-10-17):
1493 # Mark Brader writes that an article in the 1997-10-14 Toronto Star
1494 # says that Atikokan, Ontario currently does not observe DST,
1495 # but will vote on 11-10 whether to use EST/EDT.
1496 # He also writes that the Ontario Time Act (1990, Chapter T.9)
1497 # http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html
1498 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1499 # Officially Atikokan is therefore on CST/CDT, and most likely this report
1500 # concerns a non-official time observed as a matter of local practice.
1501 #
1502 # From Paul Eggert (2000-10-02):
1503 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1504 # New Osnaburgh observe CST all year, that Big Trout Lake observes
1505 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1506 # violation of the official Ontario rules.
1507 #
1508 # From Paul Eggert (2006-07-09):
1509 # Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1510 # 2005-07-21 Chronicle-Journal, which said:
1962 -7:00 - MST
1963 Zone America/Fort_Nelson -8:10:47 - LMT 1884
1964 -8:00 Vanc P%sT 1946
1965 -8:00 - PST 1947
1966 -8:00 Vanc P%sT 1987
1967 -8:00 Canada P%sT 2015 Mar 8 2:00
1968 -7:00 - MST
1969 Zone America/Creston -7:46:04 - LMT 1884
1970 -7:00 - MST 1916 Oct 1
1971 -8:00 - PST 1918 Jun 2
1972 -7:00 - MST
1973
1974 # Northwest Territories, Nunavut, Yukon
1975
1976 # From Paul Eggert (2006-03-22):
1977 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1978 # Mathew Englander (1996-10-07) gives the following refs:
1979 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1980 # c. 7 defines Yukon standard time as UTC-9....
1981 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1982 # [http://canlii.ca/t/7vhg]
1983 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1984 # * O.I.C. 1980/02 established DST.
1985 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1986
1987 # From Brian Inglis (2015-04-14):
1988 #
1989 # I tried to trace the history of Yukon time and found the following
1990 # regulations, giving the reference title and URL if found, regulation name,
1991 # and relevant quote if available. Each regulation specifically revokes its
1992 # predecessor. The final reference is to the current Interpretation Act
1993 # authorizing and resulting from these regulatory changes.
1994 #
1995 # Only recent regulations were retrievable via Yukon government site search or
1996 # index, and only some via Canadian legal sources. Other sources used include
1997 # articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS
1998 # Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and
1999 # 1970 quoted below; each article includes current extracts from provincial
2000 # and territorial ST and DST regulations at the end, summaries and details of
2001 # standard times and daylight saving time at many locations across Canada,
2002 # with time zone maps, tables and calculations for Canadian Sunrise, Sunset,
2027 #
2028 # * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC,
2029 # Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS)
2030 # http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon
2031 # Territory Commissioner's Order 1967-59 Interpretation Ordinance ...
2032 #
2033 # 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon
2034 # Territory on 27th January, 1966, is hereby revoked.
2035 #
2036 # 2. Yukon (East) Standard Time as defined by section 36 of the
2037 # Interpretation Ordinance from and after mid-night on the 28th day of May,
2038 # 1967 shall be reckoned in the same manner as Pacific Standard Time, that
2039 # is to say, eight hours behind Greenwich Time in the area of the Yukon
2040 # Territory lying east of the 138th degree longitude west.
2041 #
2042 # 3. In the remainder of the Territory, lying west of the 138th degree
2043 # longitude west, Yukon (West) Standard Time shall be reckoned as nine
2044 # hours behind Greenwich Time.
2045 #
2046 # * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214
2047 # http://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html
2048 # C.O. 1973/214 INTERPRETATION ACT ...
2049 #
2050 # 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby
2051 # revoked.
2052 #
2053 # 2. Yukon Standard Time as defined by section 36 of the Interpretation
2054 # Act from and after midnight on the twenty-eighth day of October, 1973
2055 # shall be reckoned in the same manner as Pacific Standard Time, that is
2056 # to say eight hours behind Greenwich Time.
2057 #
2058 # * O.I.C. 1980/02 INTERPRETATION ACT
2059 # http://? - no online source found
2060 #
2061 # * Yukon Daylight Saving Time, YOIC 1987/56
2062 # http://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html
2063 # O.I.C. 1987/056 INTERPRETATION ACT ...
2064 #
2065 # In every year between
2066 # (a) two o'clock in the morning in the first Sunday in April, and
2067 # (b) two o'clock in the morning in the last Sunday in October,
2068 # Standard Time shall be reckoned as seven hours behind Greenwich Time and
2069 # called Yukon Daylight Saving Time.
2070 # ...
2071 # Dated ... 9th day of March, A.D., 1987.
2072 #
2073 # * Yukon Daylight Saving Time 2006, YOIC 2006/127
2074 # http://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html
2075 # O.I.C. 2006/127 INTERPRETATION ACT ...
2076 #
2077 # 1. In Yukon each year the time for general purposes shall be 7 hours
2078 # behind Greenwich mean time during the period commencing at two o'clock
2079 # in the forenoon on the second Sunday of March and ending at two o'clock
2080 # in the forenoon on the first Sunday of November and shall be called
2081 # Yukon Daylight Saving Time.
2082 #
2083 # 2. Order-in-Council 1987/56 is revoked.
2084 #
2085 # 3. This order comes into force January 1, 2007.
2086 #
2087 # * Interpretation Act, RSY 2002, c 125
2088 # http://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html
2089
2090 # From Rives McDow (1999-09-04):
2091 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
2092 # Nunavut moves to single time zone Oct. 31
2093 # http://www.nunatsiaq.com/nunavut/nvt90903_13.html
2094 #
2095 # From Antoine Leca (1999-09-06):
2096 # We then need to create a new timezone for the Kitikmeot region of Nunavut
2097 # to differentiate it from the Yellowknife region.
2098
2099 # From Paul Eggert (1999-09-20):
2100 # Basic Facts: The New Territory
2101 # http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html
2102 # (1999) reports that Pangnirtung operates on eastern time,
2103 # and that Coral Harbour does not observe DST. We don't know when
2104 # Pangnirtung switched to eastern time; we'll guess 1995.
2105
2106 # From Rives McDow (1999-11-08):
2107 # On October 31, when the rest of Nunavut went to Central time,
2108 # Pangnirtung wobbled. Here is the result of their wobble:
2111 #
2112 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
2113 # Eastern Arctic National Parks, A & D Specialist
2114 #
2115 # The following businesses and organizations in Pangnirtung use Eastern Time:
2116 #
2117 # Hamlet office, All other businesses, Both schools, Airport operator
2118 #
2119 # This has made for an interesting situation there, which warranted the news.
2120 # No one there that I spoke with seems concerned, or has plans to
2121 # change the local methods of keeping time, as it evidently does not
2122 # really interfere with any activities or make things difficult locally.
2123 # They plan to celebrate New Year's turn-over twice, one hour apart,
2124 # so it appears that the situation will last at least that long.
2125 # The Nunavut Intergovernmental Affairs hopes that they will "come to
2126 # their senses", but the locals evidently don't see any problem with
2127 # the current state of affairs.
2128
2129 # From Michaela Rodrigue, writing in the
2130 # Nunatsiaq News (1999-11-19):
2131 # http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html
2132 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
2133 # central - or Nunavut time - for government offices, and eastern time
2134 # for municipal offices and schools.... Igloolik [was similar but then]
2135 # made the switch to central time on Saturday, Nov. 6.
2136
2137 # From Paul Eggert (2000-10-02):
2138 # Matthews and Vincent (1998) say the following, but we lack histories
2139 # for these potential new Zones.
2140 #
2141 # The Canadian Forces station at Alert uses Eastern Time while the
2142 # handful of residents at the Eureka weather station [in the Central
2143 # zone] skip daylight savings. Baffin Island, which is crossed by the
2144 # Central, Eastern and Atlantic Time zones only uses Eastern Time.
2145 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
2146 # Central Time and Southampton Island [in the Central zone] is not
2147 # required to use daylight savings.
2148
2149 # From <http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html>
2150 # Nunavut now has two time zones (2000-11-10):
2151 # The Nunavut government would allow its employees in Kugluktuk and
2152 # Cambridge Bay to operate on central time year-round, putting them
2153 # one hour behind the rest of Nunavut for six months during the winter.
2154 # At the end of October the two communities had rebelled against
2155 # Nunavut's unified time zone, refusing to shift to eastern time with
2156 # the rest of the territory for the winter. Cambridge Bay remained on
2157 # central time, while Kugluktuk, even farther west, reverted to
2158 # mountain time, which they had used before the advent of Nunavut's
2159 # unified time zone in 1999.
2160 #
2161 # From Rives McDow (2001-01-20), quoting the Nunavut government:
2162 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
2163
2164 # From Paul Eggert (2000-12-04):
2165 # Let's just keep track of the official times for now.
2166
2167 # From Rives McDow (2001-03-07):
2168 # The premier of Nunavut has issued a ministerial statement advising
2169 # that effective 2001-04-01, the territory of Nunavut will revert
2460 # From Steffen Thorsen (2009-12-28):
2461 #
2462 # Steffen Thorsen wrote:
2463 # > Mexico's House of Representatives has approved a proposal for northern
2464 # > Mexico's border cities to share the same daylight saving schedule as
2465 # > the United States.
2466 # Now this has passed both the Congress and the Senate, so starting from
2467 # 2010, some border regions will be the same:
2468 # http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2469 # http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2470 # (Spanish)
2471 #
2472 # Could not find the new law text, but the proposed law text changes are here:
2473 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2474 # (Gaceta Parlamentaria)
2475 #
2476 # There is also a list of the votes here:
2477 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2478 #
2479 # Our page:
2480 # http://www.timeanddate.com/news/time/north-mexico-dst-change.html
2481
2482 # From Arthur David Olson (2010-01-20):
2483 # The page
2484 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2485 # includes this text:
2486 # En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2487 # Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2488 # Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2489 # Tamaulipas, la aplicación de este horario estacional surtirá efecto
2490 # desde las dos horas del segundo domingo de marzo y concluirá a las dos
2491 # horas del primer domingo de noviembre.
2492 # En los municipios fronterizos que se encuentren ubicados en la franja
2493 # fronteriza norte en el territorio comprendido entre la línea
2494 # internacional y la línea paralela ubicada a una distancia de veinte
2495 # kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2496 # interior del país, la aplicación de este horario estacional surtirá
2497 # efecto desde las dos horas del segundo domingo de marzo y concluirá a
2498 # las dos horas del primer domingo de noviembre.
2499
2500 # From Steffen Thorsen (2014-12-08), translated by Gwillim Law:
2879 #
2880 # Regirá el Horario Normal desde el próximo domingo 28 de octubre
2881 # http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2882 #
2883 # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2884
2885 # From Arthur David Olson (2008-03-09):
2886 # I'm in Maryland which is now observing United States Eastern Daylight
2887 # Time. At 9:44 local time I used RealPlayer to listen to
2888 # http://media.enet.cu/radioreloj
2889 # a Cuban information station, and heard
2890 # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2891 # indicating that Cuba is still on standard time.
2892
2893 # From Steffen Thorsen (2008-03-12):
2894 # It seems that Cuba will start DST on Sunday, 2007-03-16...
2895 # It was announced yesterday, according to this source (in Spanish):
2896 # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2897 #
2898 # Some more background information is posted here:
2899 # http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2900 #
2901 # The article also says that Cuba has been observing DST since 1963,
2902 # while Shanks (and tzdata) has 1965 as the first date (except in the
2903 # 1940's). Many other web pages in Cuba also claim that it has been
2904 # observed since 1963, but with the exception of 1970 - an exception
2905 # which is not present in tzdata/Shanks. So there is a chance we need to
2906 # change some historic records as well.
2907 #
2908 # One example:
2909 # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2910
2911 # From Jesper Nørgaard Welen (2008-03-13):
2912 # The Cuban time change has just been confirmed on the most authoritative
2913 # web site, the Granma. Please check out
2914 # http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2915 #
2916 # Basically as expected after Steffen Thorsen's information, the change
2917 # will take place midnight between Saturday and Sunday.
2918
2919 # From Arthur David Olson (2008-03-12):
2926 #
2927 # http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2928 # (in Spanish)
2929
2930 # From Arthur David Olson (2009-03-09)
2931 # I listened over the Internet to
2932 # http://media.enet.cu/readioreloj
2933 # this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2934 # the time was announced as "diez cinco" - the same time as here, indicating
2935 # that has indeed switched to DST. Assume second Sunday from 2009 forward.
2936
2937 # From Steffen Thorsen (2011-03-08):
2938 # Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2939 # this year. Nothing about the end date known so far (if that has
2940 # changed at all).
2941 #
2942 # Source:
2943 # http://granma.co.cu/2011/03/08/nacional/artic01.html
2944 #
2945 # Our info:
2946 # http://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2947 #
2948 # From Steffen Thorsen (2011-10-30)
2949 # Cuba will end DST two weeks later this year. Instead of going back
2950 # tonight, it has been delayed to 2011-11-13 at 01:00.
2951 #
2952 # One source (Spanish)
2953 # http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2954 #
2955 # Our page:
2956 # http://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2957 #
2958 # From Steffen Thorsen (2012-03-01)
2959 # According to Radio Reloj, Cuba will start DST on Midnight between March
2960 # 31 and April 1.
2961 #
2962 # Radio Reloj has the following info (Spanish):
2963 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2964 #
2965 # Our info on it:
2966 # http://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2967
2968 # From Steffen Thorsen (2012-11-03):
2969 # Radio Reloj and many other sources report that Cuba is changing back
2970 # to standard time on 2012-11-04:
2971 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
2972 # From Paul Eggert (2012-11-03):
2973 # For now, assume the future rule is first Sunday in November.
2974
2975 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2976 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
2977 Rule Cuba 1928 only - Oct 10 0:00 0 S
2978 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
2979 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
2980 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
2981 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
2982 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
2983 Rule Cuba 1965 only - Sep 30 0:00 0 S
2984 Rule Cuba 1966 only - May 29 0:00 1:00 D
2985 Rule Cuba 1966 only - Oct 2 0:00 0 S
2986 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
3141 #
3142 # http://www.alterpresse.org/spip.php?article12510
3143 # http://radiovision2000haiti.net/home/?p=13253
3144 #
3145 # From Arthur David Olson (2012-03-11):
3146 # The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
3147 # 3:00 a.m. rather than the traditional Haitian jump at midnight.
3148 # Assume a US-style fall back as well.
3149
3150 # From Steffen Thorsen (2013-03-10):
3151 # It appears that Haiti is observing DST this year as well, same rules
3152 # as US/Canada. They did it last year as well, and it looks like they
3153 # are going to observe DST every year now...
3154 #
3155 # http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
3156 # http://www.canalplushaiti.net/?p=6714
3157
3158 # From Steffen Thorsen (2016-03-12):
3159 # Jean Antoine, editor of www.haiti-reference.com informed us that Haiti
3160 # are not going on DST this year. Several other resources confirm this: ...
3161 # http://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html
3162 # http://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/
3163 # http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/
3164
3165 # From Steffen Thorsen (2017-03-12):
3166 # We have received 4 mails from different people telling that Haiti
3167 # has started DST again today, and this source seems to confirm that,
3168 # I have not been able to find a more authoritative source:
3169 # https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html
3170
3171 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3172 Rule Haiti 1983 only - May 8 0:00 1:00 D
3173 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
3174 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
3175 # Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
3176 # Go with IATA.
3177 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
3178 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
3179 Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
3180 Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
3181 Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D
3182 Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S
3341 -4:00 - AST
3342
3343 # St Kitts-Nevis
3344 # St Lucia
3345 # See America/Port_of_Spain.
3346
3347 # St Pierre and Miquelon
3348 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3349 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3350 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3351 -4:00 - AST 1980 May
3352 -3:00 - -03 1987
3353 -3:00 Canada -03/-02
3354
3355 # St Vincent and the Grenadines
3356 # See America/Port_of_Spain.
3357
3358 # Turks and Caicos
3359 #
3360 # From Chris Dunn in
3361 # http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007
3362 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3363 # daylight saving dates for time changes have been adjusted to match
3364 # the recent U.S. change of dates.
3365 #
3366 # From Brian Inglis (2007-04-28):
3367 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3368 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3369 # rows before that there is an out of date entry for Oct:
3370 # "Eastern Standard Times Begins 2007
3371 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3372 # indicating that the normal ET rules are followed.
3373 #
3374 # From Paul Eggert (2014-08-19):
3375 # The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See:
3376 # http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm
3377 # Model this as a switch from EST/EDT to AST ...
3378 # From Chris Walton (2014-11-04):
3379 # ... the TCI government appears to have delayed the switch to
3380 # "permanent daylight saving time" by one year....
3381 # http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm
3382 #
3383 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3384 Zone America/Grand_Turk -4:44:32 - LMT 1890
3385 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3386 -5:00 - EST 1979
3387 -5:00 US E%sT 2015 Nov Sun>=1 2:00
3388 -4:00 - AST
3389
3390 # British Virgin Is
3391 # Virgin Is
3392 # See America/Port_of_Spain.
3393
3394
3395 # Local Variables:
3396 # coding: utf-8
3397 # End:
|
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."
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.
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 Larry M. Smith (2006-04-26) re Wisconsin:
375 # https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf
376 # is currently enforced at the 01:00 time of change. Because the local
377 # "bar time" in the state corresponds to 02:00, a number of citations
378 # are issued for the "sale of class 'B' alcohol after prohibited
379 # hours" within the deviated hour of this change every year....
380 #
381 # From Douglas R. Bomberg (2007-03-12):
382 # Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
383 # Statue 175 closer in synch with the US Congress' intent....
384 # https://docs.legis.wisconsin.gov/2007/related/acts/3
385
386 # From an email administrator of the City of Fort Pierre, SD (2015-12-21):
387 # Fort Pierre is technically located in the Mountain time zone as is
388 # the rest of Stanley County. Most of Stanley County and Fort Pierre
389 # uses the Central time zone due to doing most of their business in
390 # Pierre so it simplifies schedules. I have lived in Stanley County
391 # all my life and it has been that way since I can remember. (43 years!)
392 #
393 # From Paul Eggert (2015-12-25):
394 # Assume this practice predates 1970, so Fort Pierre can use America/Chicago.
395
396 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
397 Rule Chicago 1920 only - Jun 13 2:00 1:00 D
398 Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
399 Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
400 Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
401 Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
402 Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
403 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
404 Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24
411 -6:00 US C%sT
412 # Oliver County, ND switched from mountain to central time on 1992-10-25.
413 Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48
414 -7:00 US M%sT 1992 Oct 25 2:00
415 -6:00 US C%sT
416 # Morton County, ND, switched from mountain to central time on
417 # 2003-10-26, except for the area around Mandan which was already central time.
418 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
419 # Officially this switch also included part of Sioux County, and
420 # Jones, Mellette, and Todd Counties in South Dakota;
421 # but in practice these other counties were already observing central time.
422 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
423 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
424 -7:00 US M%sT 2003 Oct 26 2:00
425 -6:00 US C%sT
426
427 # From Josh Findley (2011-01-21):
428 # ...it appears that Mercer County, North Dakota, changed from the
429 # mountain time zone to the central time zone at the last transition from
430 # daylight-saving to standard time (on Nov. 7, 2010):
431 # https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
432 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
433
434 # From Andy Lipscomb (2011-01-24):
435 # ...according to the Census Bureau, the largest city is Beulah (although
436 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
437 # largest city in Mercer County). Google Maps places Beulah's city hall
438 # at 47 degrees 15' 51" N, 101 degrees 46' 40" W, which yields an offset
439 # of 6h47'07".
440
441 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
442 -7:00 US M%sT 2010 Nov 7 2:00
443 -6:00 US C%sT
444
445 # US mountain time, represented by Denver
446 #
447 # Colorado, far western Kansas, Montana, western
448 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
449 # New Mexico, southwestern North Dakota,
450 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
451 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
462 -7:00 Denver M%sT 1942
463 -7:00 US M%sT 1946
464 -7:00 Denver M%sT 1967
465 -7:00 US M%sT
466
467 # US Pacific time, represented by Los Angeles
468 #
469 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
470 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
471 # north of the Salmon River, and the towns of Burgdorf and Warren),
472 # Nevada (except West Wendover), Oregon (except the northern 3/4 of
473 # Malheur county), and Washington
474
475 # From Paul Eggert (2016-08-20):
476 # In early February 1948, in response to California's electricity shortage,
477 # PG&E changed power frequency from 60 to 59.5 Hz during daylight hours,
478 # causing electric clocks to lose six minutes per day. (This did not change
479 # legal time, and is not part of the data here.) See:
480 # Ross SA. An energy crisis from the past: Northern California in 1948.
481 # Working Paper No. 8, Institute of Governmental Studies, UC Berkeley,
482 # 1973-11. https://escholarship.org/uc/item/8x22k30c
483 #
484 # In another measure to save electricity, DST was instituted from 1948-03-14
485 # at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move
486 # the fallback transition earlier. See pages 3-4 of:
487 # http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf
488 #
489 # In response:
490 #
491 # Governor Warren received a torrent of objecting mail, and it is not too much
492 # to speculate that the objections to Daylight Saving Time were one important
493 # factor in the defeat of the Dewey-Warren Presidential ticket in California.
494 # -- Ross, p 25
495 #
496 # On December 8 the governor exercised the option, setting the date to January 1
497 # (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01).
498 #
499 # Despite the controversy, in 1949 California voters approved Proposition 12,
500 # which established DST from April's last Sunday at 01:00 until September's
501 # last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed
502 # the fall-back date to October's last Sunday. See:
503 # https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props
504 # https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props
505 #
506 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
507 Rule CA 1948 only - Mar 14 2:01 1:00 D
508 Rule CA 1949 only - Jan 1 2:00 0 S
509 Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D
510 Rule CA 1950 1961 - Sep lastSun 2:00 0 S
511 Rule CA 1962 1966 - Oct lastSun 2:00 0 S
512 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
513 Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
514 -8:00 US P%sT 1946
515 -8:00 CA P%sT 1967
516 -8:00 US P%sT
517
518 # Alaska
519 # AK%sT is the modern abbreviation for -09 per USNO.
520 #
521 # From Paul Eggert (2017-06-15):
522 # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
523 # and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
524 # On Friday, 1867-10-18 (Gregorian), at precisely 15:30 local time, the
525 # Russian forts and fleet at Sitka fired salutes to mark the ceremony of
526 # formal transfer. See the Sacramento Daily Union (1867-11-14), p 3, col 2.
527 # https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SDU18671114.2.12.1
528 # Sitka workers did not change their calendars until Sunday, 1867-10-20,
529 # and so celebrated two Sundays that week. See: Ahllund T (tr Hallamaa P).
530 # From the memoirs of a Finnish workman. Alaska History. 2006 Fall;21(2):1-25.
531 # http://alaskahistoricalsociety.org/wp-content/uploads/2016/12/Ahllund-2006-Memoirs-of-a-Finnish-Workman.pdf
532 # Include only the time zone part of this transition, ignoring the switch
533 # from Julian to Gregorian, since we can't represent the Julian calendar.
534 #
535 # As far as we know, of the locations mentioned below only Sitka was
536 # permanently inhabited in 1867 by anyone using either calendar.
537 # (Yakutat was colonized by the Russians in 1799, but the settlement was
538 # destroyed in 1805 by a Yakutat-kon war party.) Many of Alaska's inhabitants
539 # were unaware of the US acquisition of Alaska, much less of any calendar or
540 # time change. However, the Russian-influenced part of Alaska did observe
541 # Russian time, and it is more accurate to model this than to ignore it.
542 # The database format requires an exact transition time; use the Russian
543 # salute as a somewhat-arbitrary time for the formal transfer of control for
544 # all of Alaska. Sitka's UTC offset is -9:01:13; adjust its 15:30 to the
545 # local times of other Alaskan locations so that they change simultaneously.
546
547 # From Paul Eggert (2014-07-18):
548 # One opinion of the early-1980s turmoil in Alaska over time zones and
549 # daylight saving time appeared as graffiti on a Juneau airport wall:
550 # "Welcome to Juneau. Please turn your watch back to the 19th century."
551 # See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01.
552 # http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html
553 #
554 # Steve Ferguson (2011-01-31) referred to the following source:
555 # Norris F. Keeping time in Alaska: national directives, local response.
556 # Alaska History 2001;16(1-2).
557 # http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/
558
559 # From Arthur David Olson (2011-02-01):
560 # Here's database-relevant material from the 2001 "Alaska History" article:
561 #
562 # On September 20 [1979]...DOT...officials decreed that on April 27,
563 # 1980, Juneau and other nearby communities would move to Yukon Time.
564 # Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on
565 # Pacific Time.
578 # Nation.)
579
580 # From Arthur David Olson (2011-02-09):
581 # I just spoke by phone with a staff member at the Metlakatla Indian
582 # Community office (using contact information available at
583 # http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla
584 # It's shortly after 1:00 here on the east coast of the United States;
585 # the staffer said it was shortly after 10:00 there. When I asked whether
586 # that meant they were on Pacific time, they said no - they were on their
587 # own time. I asked about daylight saving; they said it wasn't used. I
588 # did not inquire about practices in the past.
589
590 # From Arthur David Olson (2011-08-17):
591 # For lack of better information, assume that Metlakatla's
592 # abandonment of use of daylight saving resulted from the 1983 vote.
593
594 # From Steffen Thorsen (2015-11-09):
595 # It seems Metlakatla did go off PST on Sunday, November 1, changing
596 # their time to AKST and are going to follow Alaska's DST, switching
597 # between AKST and AKDT from now on....
598 # https://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/
599
600 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
601 Zone America/Juneau 15:02:19 - LMT 1867 Oct 19 15:33:32
602 -8:57:41 - LMT 1900 Aug 20 12:00
603 -8:00 - PST 1942
604 -8:00 US P%sT 1946
605 -8:00 - PST 1969
606 -8:00 US P%sT 1980 Apr 27 2:00
607 -9:00 US Y%sT 1980 Oct 26 2:00
608 -8:00 US P%sT 1983 Oct 30 2:00
609 -9:00 US Y%sT 1983 Nov 30
610 -9:00 US AK%sT
611 Zone America/Sitka 14:58:47 - LMT 1867 Oct 19 15:30
612 -9:01:13 - LMT 1900 Aug 20 12:00
613 -8:00 - PST 1942
614 -8:00 US P%sT 1946
615 -8:00 - PST 1969
616 -8:00 US P%sT 1983 Oct 30 2:00
617 -9:00 US Y%sT 1983 Nov 30
618 -9:00 US AK%sT
619 Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 19 15:44:55
620 -8:46:18 - LMT 1900 Aug 20 12:00
621 -8:00 - PST 1942
622 -8:00 US P%sT 1946
623 -8:00 - PST 1969
624 -8:00 US P%sT 1983 Oct 30 2:00
625 -8:00 - PST 2015 Nov 1 2:00
626 -9:00 US AK%sT
627 Zone America/Yakutat 14:41:05 - LMT 1867 Oct 19 15:12:18
628 -9:18:55 - LMT 1900 Aug 20 12:00
629 -9:00 - YST 1942
630 -9:00 US Y%sT 1946
631 -9:00 - YST 1969
632 -9:00 US Y%sT 1983 Nov 30
633 -9:00 US AK%sT
634 Zone America/Anchorage 14:00:24 - LMT 1867 Oct 19 14:31:37
635 -9:59:36 - LMT 1900 Aug 20 12:00
636 -10:00 - AST 1942
637 -10:00 US A%sT 1967 Apr
638 -10:00 - AHST 1969
639 -10:00 US AH%sT 1983 Oct 30 2:00
640 -9:00 US Y%sT 1983 Nov 30
641 -9:00 US AK%sT
642 Zone America/Nome 12:58:22 - LMT 1867 Oct 19 13:29:35
643 -11:01:38 - LMT 1900 Aug 20 12:00
644 -11:00 - NST 1942
645 -11:00 US N%sT 1946
646 -11:00 - NST 1967 Apr
647 -11:00 - BST 1969
648 -11:00 US B%sT 1983 Oct 30 2:00
649 -9:00 US Y%sT 1983 Nov 30
650 -9:00 US AK%sT
651 Zone America/Adak 12:13:22 - LMT 1867 Oct 19 12:44:35
652 -11:46:38 - LMT 1900 Aug 20 12:00
653 -11:00 - NST 1942
654 -11:00 US N%sT 1946
655 -11:00 - NST 1967 Apr
656 -11:00 - BST 1969
657 -11:00 US B%sT 1983 Oct 30 2:00
658 -10:00 US AH%sT 1983 Nov 30
659 -10:00 US H%sT
660 # The following switches don't quite make our 1970 cutoff.
661 #
662 # Shanks writes that part of southwest Alaska (e.g. Aniak)
663 # switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
664 # and another part (e.g. Akiak) made the same switch five weeks later.
665 #
666 # From David Flater (2004-11-09):
667 # In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska
668 # Historic Preservation Commission, provided this information, which
669 # suggests that Unalaska deviated from statutory time from early 1967
670 # possibly until 1983:
671 #
672 # Minutes of the Unalaska City Council Meeting, January 10, 1967:
673 # "Except for St. Paul and Akutan, Unalaska is the only important
674 # location not on Alaska Standard Time. The following resolution was
675 # made by William Robinson and seconded by Henry Swanson: Be it
676 # resolved that the City of Unalaska hereby goes to Alaska Standard
677 # Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,
678 # January 14, Alaska Standard Time.) This resolution was passed with
679 # three votes for and one against."
680
681 # Hawaii
682
683 # From Arthur David Olson (2010-12-09):
684 # "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225
685 # of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09,
686 # the article is available at
687 # https://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf
688 # and indicates that standard time was adopted effective noon, January
689 # 13, 1896 (page 218), that in "1933, the Legislature decreed daylight
690 # saving for the period between the last Sunday of each April and the
691 # last Sunday of each September, but less than a month later repealed the
692 # act," (page 220), that year-round daylight saving time was in effect
693 # from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for
694 # when clocks changed) and that clocks were changed by 30 minutes
695 # effective the second Sunday of June, 1947 (page 219, with no time of
696 # day given for when clocks changed). A footnote for the 1933 changes
697 # cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933)
698 # and Act 163 (approved 21 May 1933)."
699
700 # From Arthur David Olson (2011-01-19):
701 # The following is from "Laws of the Territory of Hawaii Passed by the
702 # Seventeenth Legislature: Regular Session 1933," available (as of
703 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act
704 # 90...At 2 o'clock ante meridian of the last Sunday in April of each
705 # year, the standard time of this Territory shall be advanced one
706 # hour...This Act shall take effect upon its approval. Approved this 26th
707 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
766 # See America/Denver for a zone appropriate for the Navajo Nation.
767
768 # Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
769 # Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
770 # Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
771 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
772 # Teton, Twin Falls, Valley, Washington counties, and the southern
773 # quarter of Idaho county) and eastern Oregon (most of Malheur County)
774 # switched four weeks late in 1974.
775 #
776 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
777 Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11
778 -8:00 US P%sT 1923 May 13 2:00
779 -7:00 US M%sT 1974
780 -7:00 - MST 1974 Feb 3 2:00
781 -7:00 US M%sT
782
783 # Indiana
784 #
785 # For a map of Indiana's time zone regions, see:
786 # https://en.wikipedia.org/wiki/Time_in_Indiana
787 #
788 # From Paul Eggert (2007-08-17):
789 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
790 # with the following exceptions:
791 #
792 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
793 # Vanderburgh, and Warrick counties have been like America/Chicago.
794 #
795 # - Dearborn and Ohio counties have been like America/New_York.
796 #
797 # - Clark, Floyd, and Harrison counties have been like
798 # America/Kentucky/Louisville.
799 #
800 # - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
801 # and Switzerland counties have their own time zone histories as noted below.
802 #
803 # Shanks partitioned Indiana into 345 regions, each with its own time history,
804 # and wrote "Even newspaper reports present contradictory information."
805 # Those Hoosiers! Such a flighty and changeable people!
806 # Fortunately, most of the complexity occurred before our cutoff date of 1970.
993 # From Lake Cumberland LIFE
994 # http://www.lake-cumberland.com/life/archive/news990129time.shtml
995 # (1999-01-29) via WKYM-101.7:
996 # Clinton County has joined Wayne County in asking the DoT to change from
997 # the Central to the Eastern time zone.... The Wayne County government made
998 # the same request in December. And while Russell County officials have not
999 # taken action, the majority of respondents to a poll conducted there in
1000 # August indicated they would like to change to "fast time" also.
1001 # The three Lake Cumberland counties are the farthest east of any U.S.
1002 # location in the Central time zone.
1003 #
1004 # From Rich Wales (2000-08-29):
1005 # After prolonged debate, and despite continuing deep differences of opinion,
1006 # Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
1007 # (-0500) time. They won't "fall back" this year. See Sara Shipley,
1008 # The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
1009 #
1010 # From Paul Eggert (2001-07-16):
1011 # The final rule was published in the
1012 # Federal Register 65, 160 (2000-08-17), pp 50154-50158.
1013 # https://www.gpo.gov/fdsys/pkg/FR-2000-08-17/html/00-20854.htm
1014 #
1015 Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36
1016 -6:00 US C%sT 1946
1017 -6:00 - CST 1968
1018 -6:00 US C%sT 2000 Oct 29 2:00
1019 -5:00 US E%sT
1020
1021
1022 # From Rives McDow (2000-08-30):
1023 # Here ... are all the changes in the US since 1985.
1024 # Kearny County, KS (put all of county on central;
1025 # previously split between MST and CST) ... 1990-10
1026 # Starke County, IN (from CST to EST) ... 1991-10
1027 # Oliver County, ND (from MST to CST) ... 1992-10
1028 # West Wendover, NV (from PST TO MST) ... 1999-10
1029 # Wayne County, KY (from CST to EST) ... 2000-10
1030 #
1031 # From Paul Eggert (2001-07-17):
1032 # We don't know where the line used to be within Kearny County, KS,
1033 # so omit that change for now.
1034 # See America/Indiana/Knox for the Starke County, IN change.
1035 # See America/North_Dakota/Center for the Oliver County, ND change.
1036 # West Wendover, NV officially switched from Pacific to mountain time on
1037 # 1999-10-31. See the
1038 # Federal Register 64, 203 (1999-10-21), pp 56705-56707.
1039 # https://www.gpo.gov/fdsys/pkg/FR-1999-10-21/html/99-27240.htm
1040 # However, the Federal Register says that West Wendover already operated
1041 # on mountain time, and the rule merely made this official;
1042 # hence a separate tz entry is not needed.
1043
1044 # Michigan
1045 #
1046 # From Bob Devine (1988-01-28):
1047 # Michigan didn't observe DST from 1968 to 1973.
1048 #
1049 # From Paul Eggert (1999-03-31):
1050 # Shanks writes that Michigan started using standard time on 1885-09-18,
1051 # but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
1052 # that Detroit kept
1053 #
1054 # local time until 1900 when the City Council decreed that clocks should
1055 # be put back twenty-eight minutes to Central Standard Time. Half the
1056 # city obeyed, half refused. After considerable debate, the decision
1057 # was rescinded and the city reverted to Sun time. A derisive offer to
1058 # erect a sundial in front of the city hall was referred to the
1059 # Committee on Sewers. Then, in 1905, Central time was adopted
1060 # by city vote.
1061 #
1062 # This story is too entertaining to be false, so go with Howse over Shanks.
1063 #
1064 # From Paul Eggert (2001-03-06):
1065 # Garland (1927) writes "Cleveland and Detroit advanced their clocks
1066 # one hour in 1914." This change is not in Shanks. We have no more
1067 # info, so omit this for now.
1068 #
1069 # From Paul Eggert (2017-07-26):
1070 # Although Shanks says Detroit observed DST in 1967 from 06-14 00:01
1071 # until 10-29 00:01, I now see multiple reports that this is incorrect.
1072 # For example, according to a 50-year anniversary report about the 1967
1073 # Detroit riots and a major-league doubleheader on 1967-07-23, "By the time
1074 # the last fly ball of the doubleheader settled into the glove of leftfielder
1075 # Lenny Green, it was after 7 p.m. Detroit did not observe daylight saving
1076 # time, so light was already starting to fail. Twilight was made even deeper
1077 # by billowing columns of smoke that ascended in an unbroken wall north of the
1078 # ballpark." See: Dow B. Detroit '67: As violence unfolded, Tigers played two
1079 # at home vs. Yankees. Detroit Free Press 2017-07-23.
1080 # https://www.freep.com/story/sports/mlb/tigers/2017/07/23/detroit-tigers-1967-riot-new-york-yankees/499951001/
1081 #
1082 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
1083 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
1084 Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
1085 Rule Detroit 1948 only - Sep lastSun 2:00 0 S
1086 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1087 Zone America/Detroit -5:32:11 - LMT 1905
1088 -6:00 - CST 1915 May 15 2:00
1089 -5:00 - EST 1942
1090 -5:00 US E%sT 1946
1091 -5:00 Detroit E%sT 1973
1092 -5:00 US E%sT 1975
1093 -5:00 - EST 1975 Apr 27 2:00
1094 -5:00 US E%sT
1095 #
1096 # Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
1097 # switched from EST to CST/CDT in 1973.
1098 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
1099 Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
1100 Rule Menominee 1946 only - Sep lastSun 2:00 0 S
1101 Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
1102 Rule Menominee 1966 only - Oct lastSun 2:00 0 S
1103 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1104 Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
1105 -6:00 US C%sT 1946
1129 # Unfortunately this book contains many errors and cites no sources.
1130 #
1131 # Many years ago Gwillim Law wrote that a good source
1132 # for time zone data was the International Air Transport
1133 # Association's Standard Schedules Information Manual (IATA SSIM),
1134 # published semiannually. Law sent in several helpful summaries
1135 # of the IATA's data after 1990. Except where otherwise noted,
1136 # IATA SSIM is the source for entries after 1990.
1137 #
1138 # Other sources occasionally used include:
1139 #
1140 # Edward W. Whitman, World Time Differences,
1141 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
1142 # which I found in the UCLA library.
1143 #
1144 # William Willett, The Waste of Daylight, 19th edition
1145 # <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
1146 # [PDF] (1914-03)
1147 #
1148 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1149 # <https://www.jstor.org/stable/1774359>.
1150 #
1151 # See the 'europe' file for Greenland.
1152
1153 # Canada
1154
1155 # From Alain LaBonté (1994-11-14):
1156 # I post here the time zone abbreviations standardized in Canada
1157 # for both English and French in the CAN/CSA-Z234.4-89 standard....
1158 #
1159 # UTC Standard time Daylight saving time
1160 # offset French English French English
1161 # -2:30 - - HAT NDT
1162 # -3 - - HAA ADT
1163 # -3:30 HNT NST - -
1164 # -4 HNA AST HAE EDT
1165 # -5 HNE EST HAC CDT
1166 # -6 HNC CST HAR MDT
1167 # -7 HNR MST HAP PDT
1168 # -8 HNP PST HAY YDT
1169 # -9 HNY YST - -
1175 # C: du Centre Central
1176 # E: de l'Est Eastern
1177 # M: Mountain
1178 # N: Newfoundland
1179 # P: du Pacifique Pacific
1180 # R: des Rocheuses
1181 # T: de Terre-Neuve
1182 # Y: du Yukon Yukon
1183 #
1184 # From Paul Eggert (1994-11-22):
1185 # Alas, this sort of thing must be handled by localization software.
1186
1187 # Unless otherwise specified, the data entries for Canada are all from Shanks
1188 # & Pottenger.
1189
1190 # From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
1191 # 2007-03-01):
1192 # The British Columbia government announced yesterday that it will
1193 # adjust daylight savings next year to align with changes in the
1194 # U.S. and the rest of Canada....
1195 # https://archive.news.gov.bc.ca/releases/news_releases_2005-2009/2006AG0014-000330.htm
1196 # ...
1197 # Nova Scotia
1198 # Daylight saving time will be extended by four weeks starting in 2007....
1199 # https://www.novascotia.ca/just/regulations/rg2/2006/ma1206.pdf
1200 #
1201 # [For New Brunswick] the new legislation dictates that the time change is to
1202 # be done at 02:00 instead of 00:01.
1203 # https://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf
1204 # ...
1205 # Manitoba has traditionally changed the clock every fall at 03:00.
1206 # As of 2006, the transition is to take place one hour earlier at 02:00.
1207 # https://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
1208 # ...
1209 # [Alberta, Ontario, Quebec] will follow US rules.
1210 # http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM
1211 # http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm
1212 # http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF
1213 # ...
1214 # P.E.I. will follow US rules....
1215 # http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf
1216 # ...
1217 # Province of Newfoundland and Labrador....
1218 # http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm
1219 # ...
1220 # Yukon
1221 # https://www.gov.yk.ca/legislation/regs/oic2006_127.pdf
1222 # ...
1223 # N.W.T. will follow US rules. Whoever maintains the government web site
1224 # does not seem to believe in bookmarks. To see the news release, click the
1225 # following link and search for "Daylight Savings Time Change". Press the
1226 # "Daylight Savings Time Change" link; it will fire off a popup using
1227 # JavaScript.
1228 # http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive
1229 # ...
1230 # Nunavut
1231 # An amendment to the Interpretation Act was registered on February 19/2007....
1232 # http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf
1233
1234 # From Paul Eggert (2014-10-18):
1235 # H. David Matthews and Mary Vincent's map
1236 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
1237 # http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp
1238 # contains detailed boundaries for regions observing nonstandard
1239 # time and daylight saving time arrangements in Canada circa 1998.
1240 #
1241 # National Research Council Canada maintains info about time zones and DST.
1242 # https://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html
1243 # https://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5
1244 # Its unofficial information is often taken from Matthews and Vincent.
1245
1246 # From Paul Eggert (2006-06-27):
1247 # For now, assume all of DST-observing Canada will fall into line with the
1248 # new US DST rules,
1249
1250 # From Chris Walton (2011-12-01)
1251 # In the first of Tammy Hardwick's articles
1252 # http://www.ilovecreston.com/?p=articles&t=spec&ar=260
1253 # she quotes the Friday November 1/1918 edition of the Creston Review.
1254 # The quote includes these two statements:
1255 # 'Sunday the CPR went back to the old system of time...'
1256 # '... The daylight saving scheme was dropped all over Canada at the same time,'
1257 # These statements refer to a transition from daylight time to standard time
1258 # that occurred nationally on Sunday October 27/1918. This transition was
1259 # also documented in the Saturday October 26/1918 edition of the Toronto Star.
1260
1261 # In light of that evidence, we alter the date from the earlier believed
1262 # Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day
1263 # than Thursday) in all Canadian rulesets.
1264
1265 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1266 Rule Canada 1918 only - Apr 14 2:00 1:00 D
1267 Rule Canada 1918 only - Oct 27 2:00 0 S
1268 Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
1269 Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
1270 Rule Canada 1945 only - Sep 30 2:00 0 S
1271 Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
1272 Rule Canada 1974 2006 - Oct lastSun 2:00 0 S
1273 Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
1274 Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
1275 Rule Canada 2007 max - Nov Sun>=1 2:00 0 S
1276
1277
1278 # Newfoundland and Labrador
1279
1280 # From Paul Eggert (2017-10-14):
1281 # Legally Labrador should observe Newfoundland time; see:
1282 # McLeod J. Labrador time - legal or not? St. John's Telegram, 2017-10-07
1283 # http://www.thetelegram.com/news/local/labrador-time--legal-or-not-154860/
1284 # Matthews and Vincent (1998) write that the only part of Labrador
1285 # that follows the rules is the southeast corner, including Port Hope
1286 # Simpson and Mary's Harbour, but excluding, say, Black Tickle.
1287
1288 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1289 Rule StJohns 1917 only - Apr 8 2:00 1:00 D
1290 Rule StJohns 1917 only - Sep 17 2:00 0 S
1291 # Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
1292 Rule StJohns 1919 only - May 5 23:00 1:00 D
1293 Rule StJohns 1919 only - Aug 12 23:00 0 S
1294 # For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
1295 Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
1296 Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
1297 # For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
1298 # Pottenger.
1299 Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
1300 Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
1301 # Whitman gives the following transitions:
1302 # 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
1303 # but go with Shanks & Pottenger and assume they used Canadian rules.
1304 # For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
1305 # Apr 30 - Sep 24; go with Shanks & Pottenger.
1306 Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
1466 -4:00 Moncton A%sT 1942
1467 -4:00 Canada A%sT 1946
1468 -4:00 Moncton A%sT 1973
1469 -4:00 Canada A%sT 1993
1470 -4:00 Moncton A%sT 2007
1471 -4:00 Canada A%sT
1472
1473 # Quebec
1474
1475 # From Paul Eggert (2015-03-24):
1476 # See America/Toronto for most of Quebec, including Montreal.
1477 #
1478 # Matthews and Vincent (1998) also write that Quebec east of the -63
1479 # meridian is supposed to observe AST, but residents as far east as
1480 # Natashquan use EST/EDT, and residents east of Natashquan use AST.
1481 # The Quebec department of justice writes in
1482 # "The situation in Minganie and Basse-Côte-Nord"
1483 # http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1484 # that the coastal strip from just east of Natashquan to Blanc-Sablon
1485 # observes Atlantic standard time all year round.
1486 # https://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1487 # says this common practice was codified into law as of 2007.
1488 # For lack of better info, guess this practice began around 1970, contra to
1489 # Shanks & Pottenger who have this region observing AST/ADT.
1490
1491 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
1492 Zone America/Blanc-Sablon -3:48:28 - LMT 1884
1493 -4:00 Canada A%sT 1970
1494 -4:00 - AST
1495
1496 # Ontario
1497
1498 # From Paul Eggert (2006-07-09):
1499 # Shanks & Pottenger write that since 1970 most of Ontario has been like
1500 # Toronto.
1501 # Thunder Bay skipped DST in 1973.
1502 # Many smaller locales did not observe peacetime DST until 1974;
1503 # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
1504 # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
1505
1506 # From Mark Brader (2003-07-26):
1507 # [According to the Toronto Star] Orillia, Ontario, adopted DST
1508 # effective Saturday, 1912-06-22, 22:00; the article mentions that
1509 # Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
1510 # have already done so. In Orillia DST was to run until Saturday,
1511 # 1912-08-31 (no time mentioned), but it was met with considerable
1512 # hostility from certain segments of the public, and was revoked after
1513 # only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but
1514 # presumably that should be -07-06. (1912-06-19, -07-12; also letters
1515 # earlier in June).
1516 #
1517 # Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
1518 #
1519 # From Paul Eggert (2017-07-08):
1520 # For more on Orillia, see: Daubs K. Bold attempt at daylight saving
1521 # time became a comic failure in Orillia. Toronto Star 2017-07-08.
1522 # https://www.thestar.com/news/insight/2017/07/08/bold-attempt-at-daylight-saving-time-became-a-comic-failure-in-orillia.html
1523
1524 # From Paul Eggert (1997-10-17):
1525 # Mark Brader writes that an article in the 1997-10-14 Toronto Star
1526 # says that Atikokan, Ontario currently does not observe DST,
1527 # but will vote on 11-10 whether to use EST/EDT.
1528 # He also writes that the Ontario Time Act (1990, Chapter T.9)
1529 # http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html
1530 # says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
1531 # Officially Atikokan is therefore on CST/CDT, and most likely this report
1532 # concerns a non-official time observed as a matter of local practice.
1533 #
1534 # From Paul Eggert (2000-10-02):
1535 # Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
1536 # New Osnaburgh observe CST all year, that Big Trout Lake observes
1537 # CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
1538 # violation of the official Ontario rules.
1539 #
1540 # From Paul Eggert (2006-07-09):
1541 # Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
1542 # 2005-07-21 Chronicle-Journal, which said:
1994 -7:00 - MST
1995 Zone America/Fort_Nelson -8:10:47 - LMT 1884
1996 -8:00 Vanc P%sT 1946
1997 -8:00 - PST 1947
1998 -8:00 Vanc P%sT 1987
1999 -8:00 Canada P%sT 2015 Mar 8 2:00
2000 -7:00 - MST
2001 Zone America/Creston -7:46:04 - LMT 1884
2002 -7:00 - MST 1916 Oct 1
2003 -8:00 - PST 1918 Jun 2
2004 -7:00 - MST
2005
2006 # Northwest Territories, Nunavut, Yukon
2007
2008 # From Paul Eggert (2006-03-22):
2009 # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
2010 # Mathew Englander (1996-10-07) gives the following refs:
2011 # * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
2012 # c. 7 defines Yukon standard time as UTC-9....
2013 # see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
2014 # [https://www.canlii.org/en/ca/laws/stat/rsc-1985-c-i-21/latest/rsc-1985-c-i-21.html]
2015 # * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
2016 # * O.I.C. 1980/02 established DST.
2017 # * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
2018
2019 # From Brian Inglis (2015-04-14):
2020 #
2021 # I tried to trace the history of Yukon time and found the following
2022 # regulations, giving the reference title and URL if found, regulation name,
2023 # and relevant quote if available. Each regulation specifically revokes its
2024 # predecessor. The final reference is to the current Interpretation Act
2025 # authorizing and resulting from these regulatory changes.
2026 #
2027 # Only recent regulations were retrievable via Yukon government site search or
2028 # index, and only some via Canadian legal sources. Other sources used include
2029 # articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS
2030 # Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and
2031 # 1970 quoted below; each article includes current extracts from provincial
2032 # and territorial ST and DST regulations at the end, summaries and details of
2033 # standard times and daylight saving time at many locations across Canada,
2034 # with time zone maps, tables and calculations for Canadian Sunrise, Sunset,
2059 #
2060 # * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC,
2061 # Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS)
2062 # http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon
2063 # Territory Commissioner's Order 1967-59 Interpretation Ordinance ...
2064 #
2065 # 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon
2066 # Territory on 27th January, 1966, is hereby revoked.
2067 #
2068 # 2. Yukon (East) Standard Time as defined by section 36 of the
2069 # Interpretation Ordinance from and after mid-night on the 28th day of May,
2070 # 1967 shall be reckoned in the same manner as Pacific Standard Time, that
2071 # is to say, eight hours behind Greenwich Time in the area of the Yukon
2072 # Territory lying east of the 138th degree longitude west.
2073 #
2074 # 3. In the remainder of the Territory, lying west of the 138th degree
2075 # longitude west, Yukon (West) Standard Time shall be reckoned as nine
2076 # hours behind Greenwich Time.
2077 #
2078 # * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214
2079 # https://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html
2080 # C.O. 1973/214 INTERPRETATION ACT ...
2081 #
2082 # 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby
2083 # revoked.
2084 #
2085 # 2. Yukon Standard Time as defined by section 36 of the Interpretation
2086 # Act from and after midnight on the twenty-eighth day of October, 1973
2087 # shall be reckoned in the same manner as Pacific Standard Time, that is
2088 # to say eight hours behind Greenwich Time.
2089 #
2090 # * O.I.C. 1980/02 INTERPRETATION ACT
2091 # http://? - no online source found
2092 #
2093 # * Yukon Daylight Saving Time, YOIC 1987/56
2094 # https://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html
2095 # O.I.C. 1987/056 INTERPRETATION ACT ...
2096 #
2097 # In every year between
2098 # (a) two o'clock in the morning in the first Sunday in April, and
2099 # (b) two o'clock in the morning in the last Sunday in October,
2100 # Standard Time shall be reckoned as seven hours behind Greenwich Time and
2101 # called Yukon Daylight Saving Time.
2102 # ...
2103 # Dated ... 9th day of March, A.D., 1987.
2104 #
2105 # * Yukon Daylight Saving Time 2006, YOIC 2006/127
2106 # https://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html
2107 # O.I.C. 2006/127 INTERPRETATION ACT ...
2108 #
2109 # 1. In Yukon each year the time for general purposes shall be 7 hours
2110 # behind Greenwich mean time during the period commencing at two o'clock
2111 # in the forenoon on the second Sunday of March and ending at two o'clock
2112 # in the forenoon on the first Sunday of November and shall be called
2113 # Yukon Daylight Saving Time.
2114 #
2115 # 2. Order-in-Council 1987/56 is revoked.
2116 #
2117 # 3. This order comes into force January 1, 2007.
2118 #
2119 # * Interpretation Act, RSY 2002, c 125
2120 # https://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html
2121
2122 # From Rives McDow (1999-09-04):
2123 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
2124 # Nunavut moves to single time zone Oct. 31
2125 # http://www.nunatsiaq.com/nunavut/nvt90903_13.html
2126 #
2127 # From Antoine Leca (1999-09-06):
2128 # We then need to create a new timezone for the Kitikmeot region of Nunavut
2129 # to differentiate it from the Yellowknife region.
2130
2131 # From Paul Eggert (1999-09-20):
2132 # Basic Facts: The New Territory
2133 # http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html
2134 # (1999) reports that Pangnirtung operates on eastern time,
2135 # and that Coral Harbour does not observe DST. We don't know when
2136 # Pangnirtung switched to eastern time; we'll guess 1995.
2137
2138 # From Rives McDow (1999-11-08):
2139 # On October 31, when the rest of Nunavut went to Central time,
2140 # Pangnirtung wobbled. Here is the result of their wobble:
2143 #
2144 # First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
2145 # Eastern Arctic National Parks, A & D Specialist
2146 #
2147 # The following businesses and organizations in Pangnirtung use Eastern Time:
2148 #
2149 # Hamlet office, All other businesses, Both schools, Airport operator
2150 #
2151 # This has made for an interesting situation there, which warranted the news.
2152 # No one there that I spoke with seems concerned, or has plans to
2153 # change the local methods of keeping time, as it evidently does not
2154 # really interfere with any activities or make things difficult locally.
2155 # They plan to celebrate New Year's turn-over twice, one hour apart,
2156 # so it appears that the situation will last at least that long.
2157 # The Nunavut Intergovernmental Affairs hopes that they will "come to
2158 # their senses", but the locals evidently don't see any problem with
2159 # the current state of affairs.
2160
2161 # From Michaela Rodrigue, writing in the
2162 # Nunatsiaq News (1999-11-19):
2163 # http://www.nunatsiaqonline.ca/archives/nunavut991130/nvt91119_17.html
2164 # Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
2165 # central - or Nunavut time - for government offices, and eastern time
2166 # for municipal offices and schools.... Igloolik [was similar but then]
2167 # made the switch to central time on Saturday, Nov. 6.
2168
2169 # From Paul Eggert (2000-10-02):
2170 # Matthews and Vincent (1998) say the following, but we lack histories
2171 # for these potential new Zones.
2172 #
2173 # The Canadian Forces station at Alert uses Eastern Time while the
2174 # handful of residents at the Eureka weather station [in the Central
2175 # zone] skip daylight savings. Baffin Island, which is crossed by the
2176 # Central, Eastern and Atlantic Time zones only uses Eastern Time.
2177 # Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
2178 # Central Time and Southampton Island [in the Central zone] is not
2179 # required to use daylight savings.
2180
2181 # From <http://www.nunatsiaqonline.ca/archives/nunavut001130/nvt21110_02.html>
2182 # Nunavut now has two time zones (2000-11-10):
2183 # The Nunavut government would allow its employees in Kugluktuk and
2184 # Cambridge Bay to operate on central time year-round, putting them
2185 # one hour behind the rest of Nunavut for six months during the winter.
2186 # At the end of October the two communities had rebelled against
2187 # Nunavut's unified time zone, refusing to shift to eastern time with
2188 # the rest of the territory for the winter. Cambridge Bay remained on
2189 # central time, while Kugluktuk, even farther west, reverted to
2190 # mountain time, which they had used before the advent of Nunavut's
2191 # unified time zone in 1999.
2192 #
2193 # From Rives McDow (2001-01-20), quoting the Nunavut government:
2194 # The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
2195
2196 # From Paul Eggert (2000-12-04):
2197 # Let's just keep track of the official times for now.
2198
2199 # From Rives McDow (2001-03-07):
2200 # The premier of Nunavut has issued a ministerial statement advising
2201 # that effective 2001-04-01, the territory of Nunavut will revert
2492 # From Steffen Thorsen (2009-12-28):
2493 #
2494 # Steffen Thorsen wrote:
2495 # > Mexico's House of Representatives has approved a proposal for northern
2496 # > Mexico's border cities to share the same daylight saving schedule as
2497 # > the United States.
2498 # Now this has passed both the Congress and the Senate, so starting from
2499 # 2010, some border regions will be the same:
2500 # http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/
2501 # http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939
2502 # (Spanish)
2503 #
2504 # Could not find the new law text, but the proposed law text changes are here:
2505 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf
2506 # (Gaceta Parlamentaria)
2507 #
2508 # There is also a list of the votes here:
2509 # http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html
2510 #
2511 # Our page:
2512 # https://www.timeanddate.com/news/time/north-mexico-dst-change.html
2513
2514 # From Arthur David Olson (2010-01-20):
2515 # The page
2516 # http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010
2517 # includes this text:
2518 # En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2519 # Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2520 # Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2521 # Tamaulipas, la aplicación de este horario estacional surtirá efecto
2522 # desde las dos horas del segundo domingo de marzo y concluirá a las dos
2523 # horas del primer domingo de noviembre.
2524 # En los municipios fronterizos que se encuentren ubicados en la franja
2525 # fronteriza norte en el territorio comprendido entre la línea
2526 # internacional y la línea paralela ubicada a una distancia de veinte
2527 # kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2528 # interior del país, la aplicación de este horario estacional surtirá
2529 # efecto desde las dos horas del segundo domingo de marzo y concluirá a
2530 # las dos horas del primer domingo de noviembre.
2531
2532 # From Steffen Thorsen (2014-12-08), translated by Gwillim Law:
2911 #
2912 # Regirá el Horario Normal desde el próximo domingo 28 de octubre
2913 # http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html
2914 #
2915 # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
2916
2917 # From Arthur David Olson (2008-03-09):
2918 # I'm in Maryland which is now observing United States Eastern Daylight
2919 # Time. At 9:44 local time I used RealPlayer to listen to
2920 # http://media.enet.cu/radioreloj
2921 # a Cuban information station, and heard
2922 # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
2923 # indicating that Cuba is still on standard time.
2924
2925 # From Steffen Thorsen (2008-03-12):
2926 # It seems that Cuba will start DST on Sunday, 2007-03-16...
2927 # It was announced yesterday, according to this source (in Spanish):
2928 # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
2929 #
2930 # Some more background information is posted here:
2931 # https://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
2932 #
2933 # The article also says that Cuba has been observing DST since 1963,
2934 # while Shanks (and tzdata) has 1965 as the first date (except in the
2935 # 1940's). Many other web pages in Cuba also claim that it has been
2936 # observed since 1963, but with the exception of 1970 - an exception
2937 # which is not present in tzdata/Shanks. So there is a chance we need to
2938 # change some historic records as well.
2939 #
2940 # One example:
2941 # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
2942
2943 # From Jesper Nørgaard Welen (2008-03-13):
2944 # The Cuban time change has just been confirmed on the most authoritative
2945 # web site, the Granma. Please check out
2946 # http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html
2947 #
2948 # Basically as expected after Steffen Thorsen's information, the change
2949 # will take place midnight between Saturday and Sunday.
2950
2951 # From Arthur David Olson (2008-03-12):
2958 #
2959 # http://www.worldtimezone.com/dst_news/dst_news_cuba05.html
2960 # (in Spanish)
2961
2962 # From Arthur David Olson (2009-03-09)
2963 # I listened over the Internet to
2964 # http://media.enet.cu/readioreloj
2965 # this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
2966 # the time was announced as "diez cinco" - the same time as here, indicating
2967 # that has indeed switched to DST. Assume second Sunday from 2009 forward.
2968
2969 # From Steffen Thorsen (2011-03-08):
2970 # Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00
2971 # this year. Nothing about the end date known so far (if that has
2972 # changed at all).
2973 #
2974 # Source:
2975 # http://granma.co.cu/2011/03/08/nacional/artic01.html
2976 #
2977 # Our info:
2978 # https://www.timeanddate.com/news/time/cuba-starts-dst-2011.html
2979 #
2980 # From Steffen Thorsen (2011-10-30)
2981 # Cuba will end DST two weeks later this year. Instead of going back
2982 # tonight, it has been delayed to 2011-11-13 at 01:00.
2983 #
2984 # One source (Spanish)
2985 # http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html
2986 #
2987 # Our page:
2988 # https://www.timeanddate.com/news/time/cuba-time-changes-2011.html
2989 #
2990 # From Steffen Thorsen (2012-03-01)
2991 # According to Radio Reloj, Cuba will start DST on Midnight between March
2992 # 31 and April 1.
2993 #
2994 # Radio Reloj has the following info (Spanish):
2995 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril
2996 #
2997 # Our info on it:
2998 # https://www.timeanddate.com/news/time/cuba-starts-dst-2012.html
2999
3000 # From Steffen Thorsen (2012-11-03):
3001 # Radio Reloj and many other sources report that Cuba is changing back
3002 # to standard time on 2012-11-04:
3003 # http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre
3004 # From Paul Eggert (2012-11-03):
3005 # For now, assume the future rule is first Sunday in November.
3006
3007 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3008 Rule Cuba 1928 only - Jun 10 0:00 1:00 D
3009 Rule Cuba 1928 only - Oct 10 0:00 0 S
3010 Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
3011 Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
3012 Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
3013 Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
3014 Rule Cuba 1965 only - Jun 1 0:00 1:00 D
3015 Rule Cuba 1965 only - Sep 30 0:00 0 S
3016 Rule Cuba 1966 only - May 29 0:00 1:00 D
3017 Rule Cuba 1966 only - Oct 2 0:00 0 S
3018 Rule Cuba 1967 only - Apr 8 0:00 1:00 D
3173 #
3174 # http://www.alterpresse.org/spip.php?article12510
3175 # http://radiovision2000haiti.net/home/?p=13253
3176 #
3177 # From Arthur David Olson (2012-03-11):
3178 # The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to
3179 # 3:00 a.m. rather than the traditional Haitian jump at midnight.
3180 # Assume a US-style fall back as well.
3181
3182 # From Steffen Thorsen (2013-03-10):
3183 # It appears that Haiti is observing DST this year as well, same rules
3184 # as US/Canada. They did it last year as well, and it looks like they
3185 # are going to observe DST every year now...
3186 #
3187 # http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/
3188 # http://www.canalplushaiti.net/?p=6714
3189
3190 # From Steffen Thorsen (2016-03-12):
3191 # Jean Antoine, editor of www.haiti-reference.com informed us that Haiti
3192 # are not going on DST this year. Several other resources confirm this: ...
3193 # https://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html
3194 # https://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/
3195 # http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/
3196
3197 # From Steffen Thorsen (2017-03-12):
3198 # We have received 4 mails from different people telling that Haiti
3199 # has started DST again today, and this source seems to confirm that,
3200 # I have not been able to find a more authoritative source:
3201 # https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html
3202
3203 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3204 Rule Haiti 1983 only - May 8 0:00 1:00 D
3205 Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
3206 Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
3207 # Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
3208 # Go with IATA.
3209 Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
3210 Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
3211 Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
3212 Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S
3213 Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D
3214 Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S
3373 -4:00 - AST
3374
3375 # St Kitts-Nevis
3376 # St Lucia
3377 # See America/Port_of_Spain.
3378
3379 # St Pierre and Miquelon
3380 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3381 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3382 Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3383 -4:00 - AST 1980 May
3384 -3:00 - -03 1987
3385 -3:00 Canada -03/-02
3386
3387 # St Vincent and the Grenadines
3388 # See America/Port_of_Spain.
3389
3390 # Turks and Caicos
3391 #
3392 # From Chris Dunn in
3393 # https://bugs.debian.org/415007
3394 # (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3395 # daylight saving dates for time changes have been adjusted to match
3396 # the recent U.S. change of dates.
3397 #
3398 # From Brian Inglis (2007-04-28):
3399 # http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26]
3400 # there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
3401 # rows before that there is an out of date entry for Oct:
3402 # "Eastern Standard Times Begins 2007
3403 # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
3404 # indicating that the normal ET rules are followed.
3405 #
3406 # From Paul Eggert (2014-08-19):
3407 # The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See:
3408 # http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm
3409 # Model this as a switch from EST/EDT to AST ...
3410 # From Chris Walton (2014-11-04):
3411 # ... the TCI government appears to have delayed the switch to
3412 # "permanent daylight saving time" by one year....
3413 # http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm
3414 #
3415 # From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen:
3416 # ... agreed to the reintroduction in TCI of Daylight Saving Time (DST)
3417 # during the summer months and Standard Time, also known as Local
3418 # Time, during the winter months with effect from April 2018 ...
3419 # https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3
3420 #
3421 # From Paul Eggert (2017-08-26):
3422 # The date of effect of the spring 2018 change appears to be March 11,
3423 # which makes more sense. See: Hamilton D. Time change back
3424 # by March 2018 for TCI. Magnetic Media. 2017-08-25.
3425 # http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/
3426 #
3427 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3428 Zone America/Grand_Turk -4:44:32 - LMT 1890
3429 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3430 -5:00 - EST 1979
3431 -5:00 US E%sT 2015 Nov Sun>=1 2:00
3432 -4:00 - AST 2018 Mar 11 3:00
3433 -5:00 US E%sT
3434
3435 # British Virgin Is
3436 # Virgin Is
3437 # See America/Port_of_Spain.
3438
3439
3440 # Local Variables:
3441 # coding: utf-8
3442 # End:
|