4 # This code is free software; you can redistribute it and/or modify it
5 # under the terms of the GNU General Public License version 2 only, as
6 # published by the Free Software Foundation. Oracle designates this
7 # particular file as subject to the "Classpath" exception as provided
8 # by Oracle in the LICENSE file that accompanied this code.
9 #
10 # This code is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 # version 2 for more details (a copy is included in the LICENSE file that
14 # accompanied this code).
15 #
16 # You should have received a copy of the GNU General Public License version
17 # 2 along with this work; if not, write to the Free Software Foundation,
18 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 #
20 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 # or visit www.oracle.com if you need additional information or have any
22 # questions.
23 #
24 # This file is in the public domain, so clarified as of
25 # 2009-05-17 by Arthur David Olson.
26
27 # also includes Central America and the Caribbean
28
29 # This file is by no means authoritative; if you think you know better,
30 # go ahead and edit the file (and please send any changes to
31 # tz@iana.org for general use in the future). For more, please see
32 # the file CONTRIBUTING in the tz distribution.
33
34 # From Paul Eggert (1999-03-22):
35 # A reliable and entertaining source about time zones is
36 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
37
38 ###############################################################################
39
40 # United States
41
42 # From Paul Eggert (1999-03-31):
43 # Howse writes (pp 121-125) that time zones were invented by
54 # work in the US was William Frederick Allen - railway engineer,
55 # managing editor of the Travelers' Guide, and secretary of the
56 # General Time Convention, a railway standardization group. Allen
57 # spent months in dialogs with scientific and railway leaders,
58 # developed a workable plan to institute time zones, and presented it
59 # to the General Time Convention on 1883-04-11, saying that his plan
60 # meant "local time would be practically abolished" - a plus for
61 # railway scheduling. By the next convention on 1883-10-11 nearly all
62 # railroads had agreed and it took effect on 1883-11-18. That Sunday
63 # was called the "day of two noons", as some locations observed noon
64 # twice. Allen witnessed the transition in New York City, writing:
65 #
66 # I heard the bells of St. Paul's strike on the old time. Four
67 # minutes later, obedient to the electrical signal from the Naval
68 # Observatory ... the time-ball made its rapid descent, the chimes
69 # of old Trinity rang twelve measured strokes, and local time was
70 # abandoned, probably forever.
71 #
72 # Most of the US soon followed suit. See:
73 # Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
74 # http://dx.doi.org/10.2307/3105430
75
76 # From Paul Eggert (2005-04-16):
77 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
78 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
79
80 # From Paul Eggert (2006-03-22):
81 # A good source for time zone historical data in the US is
82 # Thomas G. Shanks, The American Atlas (5th edition),
83 # San Diego: ACS Publications, Inc. (1991).
84 # Make sure you have the errata sheet; the book is somewhat useless without it.
85 # It is the source for most of the pre-1991 US entries below.
86
87 # From Paul Eggert (2001-03-06):
88 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
89 # in his whimsical essay "An Economical Project for Diminishing the Cost
90 # of Light" published in the Journal de Paris (1784-04-26).
91 # Not everyone is happy with the results:
92 #
93 # I don't really care how time is reckoned so long as there is some
94 # agreement about it, but I object to being told that I am saving
443 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
444
445 # From Andy Lipscomb (2011-01-24):
446 # ...according to the Census Bureau, the largest city is Beulah (although
447 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
448 # largest city in Mercer County). Google Maps places Beulah's city hall
449 # at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07".
450
451 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
452 -7:00 US M%sT 2010 Nov 7 2:00
453 -6:00 US C%sT
454
455 # US mountain time, represented by Denver
456 #
457 # Colorado, far western Kansas, Montana, western
458 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
459 # New Mexico, southwestern North Dakota,
460 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
461 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
462 #
463 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
464 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
465 Rule Denver 1920 only - Oct lastSun 2:00 0 S
466 Rule Denver 1921 only - May 22 2:00 0 S
467 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
468 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
469 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
470 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
471 -7:00 US M%sT 1920
472 -7:00 Denver M%sT 1942
473 -7:00 US M%sT 1946
474 -7:00 Denver M%sT 1967
475 -7:00 US M%sT
476
477 # US Pacific time, represented by Los Angeles
478 #
479 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
480 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
481 # north of the Salmon River, and the towns of Burgdorf and Warren),
482 # Nevada (except West Wendover), Oregon (except the northern ¾ of
712 # Seventeenth Legislature: Regular Session 1933," available (as of
713 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act
714 # 90...At 2 o'clock ante meridian of the last Sunday in April of each
715 # year, the standard time of this Territory shall be advanced one
716 # hour...This Act shall take effect upon its approval. Approved this 26th
717 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
718 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
719 # hereby repealed...This Act shall take effect upon its approval, upon
720 # which date the standard time of this Territory shall be restored to
721 # that existing immediately prior to the taking effect of said Act 90.
722 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
723 # of the Territory of Hawaii."
724 #
725 # Note that 1933-05-21 was a Sunday.
726 # We're left to guess the time of day when Act 163 was approved; guess noon.
727
728 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
729 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00
730 -10:30 - HST 1933 Apr 30 2:00
731 -10:30 1:00 HDT 1933 May 21 12:00
732 -10:30 - HST 1942 Feb 9 2:00
733 -10:30 1:00 HDT 1945 Sep 30 2:00
734 -10:30 - HST 1947 Jun 8 2:00
735 -10:00 - HST
736
737 # Now we turn to US areas that have diverged from the consensus since 1970.
738
739 # Arizona mostly uses MST.
740
741 # From Paul Eggert (2002-10-20):
742 #
743 # The information in the rest of this paragraph is derived from the
744 # Daylight Saving Time web page
745 # <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23)
746 # maintained by the Arizona State Library, Archives and Public Records.
747 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
748 # time, but by federal law railroads, airlines, bus lines, military
749 # personnel, and some engaged in interstate commerce continued to
750 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
751 # Gazette says that was the date the law changed, and that 04-01 was
752 # the date the state's clocks would change. In 1945 the State of
753 # Arizona used standard time all year, again with exceptions only as
754 # mandated by federal law. Arizona observed DST in 1967, but Arizona
|
4 # This code is free software; you can redistribute it and/or modify it
5 # under the terms of the GNU General Public License version 2 only, as
6 # published by the Free Software Foundation. Oracle designates this
7 # particular file as subject to the "Classpath" exception as provided
8 # by Oracle in the LICENSE file that accompanied this code.
9 #
10 # This code is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 # version 2 for more details (a copy is included in the LICENSE file that
14 # accompanied this code).
15 #
16 # You should have received a copy of the GNU General Public License version
17 # 2 along with this work; if not, write to the Free Software Foundation,
18 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 #
20 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 # or visit www.oracle.com if you need additional information or have any
22 # questions.
23 #
24 # tzdb data for North and Central America and environs
25
26 # This file is in the public domain, so clarified as of
27 # 2009-05-17 by Arthur David Olson.
28
29 # also includes Central America and the Caribbean
30
31 # This file is by no means authoritative; if you think you know better,
32 # go ahead and edit the file (and please send any changes to
33 # tz@iana.org for general use in the future). For more, please see
34 # the file CONTRIBUTING in the tz distribution.
35
36 # From Paul Eggert (1999-03-22):
37 # A reliable and entertaining source about time zones is
38 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
39
40 ###############################################################################
41
42 # United States
43
44 # From Paul Eggert (1999-03-31):
45 # Howse writes (pp 121-125) that time zones were invented by
56 # work in the US was William Frederick Allen - railway engineer,
57 # managing editor of the Travelers' Guide, and secretary of the
58 # General Time Convention, a railway standardization group. Allen
59 # spent months in dialogs with scientific and railway leaders,
60 # developed a workable plan to institute time zones, and presented it
61 # to the General Time Convention on 1883-04-11, saying that his plan
62 # meant "local time would be practically abolished" - a plus for
63 # railway scheduling. By the next convention on 1883-10-11 nearly all
64 # railroads had agreed and it took effect on 1883-11-18. That Sunday
65 # was called the "day of two noons", as some locations observed noon
66 # twice. Allen witnessed the transition in New York City, writing:
67 #
68 # I heard the bells of St. Paul's strike on the old time. Four
69 # minutes later, obedient to the electrical signal from the Naval
70 # Observatory ... the time-ball made its rapid descent, the chimes
71 # of old Trinity rang twelve measured strokes, and local time was
72 # abandoned, probably forever.
73 #
74 # Most of the US soon followed suit. See:
75 # Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
76 # https://dx.doi.org/10.2307/3105430
77
78 # From Paul Eggert (2005-04-16):
79 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
80 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
81
82 # From Paul Eggert (2006-03-22):
83 # A good source for time zone historical data in the US is
84 # Thomas G. Shanks, The American Atlas (5th edition),
85 # San Diego: ACS Publications, Inc. (1991).
86 # Make sure you have the errata sheet; the book is somewhat useless without it.
87 # It is the source for most of the pre-1991 US entries below.
88
89 # From Paul Eggert (2001-03-06):
90 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
91 # in his whimsical essay "An Economical Project for Diminishing the Cost
92 # of Light" published in the Journal de Paris (1784-04-26).
93 # Not everyone is happy with the results:
94 #
95 # I don't really care how time is reckoned so long as there is some
96 # agreement about it, but I object to being told that I am saving
445 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
446
447 # From Andy Lipscomb (2011-01-24):
448 # ...according to the Census Bureau, the largest city is Beulah (although
449 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
450 # largest city in Mercer County). Google Maps places Beulah's city hall
451 # at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07".
452
453 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
454 -7:00 US M%sT 2010 Nov 7 2:00
455 -6:00 US C%sT
456
457 # US mountain time, represented by Denver
458 #
459 # Colorado, far western Kansas, Montana, western
460 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
461 # New Mexico, southwestern North Dakota,
462 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
463 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
464 #
465 # From Paul Eggert (2018-10-25):
466 # On 1921-03-04 federal law placed all of Texas into the central time zone.
467 # However, El Paso ignored the law for decades and continued to observe
468 # mountain time, on the grounds that that's what they had always done
469 # and they weren't about to let the federal government tell them what to do.
470 # Eventually the federal government gave in and changed the law on
471 # 1970-04-10 to match what El Paso was actually doing. Although
472 # that's slightly after our 1970 cutoff, there is no need to create a
473 # separate zone for El Paso since they were ignoring the law anyway. See:
474 # Long T. El Pasoans were time rebels, fought to stay in Mountain zone.
475 # El Paso Times. 2018-10-24 06:40 -06.
476 # https://www.elpasotimes.com/story/news/local/el-paso/2018/10/24/el-pasoans-were-time-rebels-fought-stay-mountain-zone/1744509002/
477 #
478 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
479 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
480 Rule Denver 1920 only - Oct lastSun 2:00 0 S
481 Rule Denver 1921 only - May 22 2:00 0 S
482 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
483 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
484 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
485 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
486 -7:00 US M%sT 1920
487 -7:00 Denver M%sT 1942
488 -7:00 US M%sT 1946
489 -7:00 Denver M%sT 1967
490 -7:00 US M%sT
491
492 # US Pacific time, represented by Los Angeles
493 #
494 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
495 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
496 # north of the Salmon River, and the towns of Burgdorf and Warren),
497 # Nevada (except West Wendover), Oregon (except the northern ¾ of
727 # Seventeenth Legislature: Regular Session 1933," available (as of
728 # 2011-01-19) at American University's Pence Law Library. Page 85: "Act
729 # 90...At 2 o'clock ante meridian of the last Sunday in April of each
730 # year, the standard time of this Territory shall be advanced one
731 # hour...This Act shall take effect upon its approval. Approved this 26th
732 # day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of
733 # Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is
734 # hereby repealed...This Act shall take effect upon its approval, upon
735 # which date the standard time of this Territory shall be restored to
736 # that existing immediately prior to the taking effect of said Act 90.
737 # Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor
738 # of the Territory of Hawaii."
739 #
740 # Note that 1933-05-21 was a Sunday.
741 # We're left to guess the time of day when Act 163 was approved; guess noon.
742
743 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
744 Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00
745 -10:30 - HST 1933 Apr 30 2:00
746 -10:30 1:00 HDT 1933 May 21 12:00
747 -10:30 US H%sT 1947 Jun 8 2:00
748 -10:00 - HST
749
750 # Now we turn to US areas that have diverged from the consensus since 1970.
751
752 # Arizona mostly uses MST.
753
754 # From Paul Eggert (2002-10-20):
755 #
756 # The information in the rest of this paragraph is derived from the
757 # Daylight Saving Time web page
758 # <http://www.dlapr.lib.az.us/links/daylight.htm> (2002-01-23)
759 # maintained by the Arizona State Library, Archives and Public Records.
760 # Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
761 # time, but by federal law railroads, airlines, bus lines, military
762 # personnel, and some engaged in interstate commerce continued to
763 # observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
764 # Gazette says that was the date the law changed, and that 04-01 was
765 # the date the state's clocks would change. In 1945 the State of
766 # Arizona used standard time all year, again with exceptions only as
767 # mandated by federal law. Arizona observed DST in 1967, but Arizona
|