31 # tz@iana.org for general use in the future). For more, please see
32 # the file CONTRIBUTING in the tz distribution.
33
34 # From Paul Eggert (1999-03-22):
35 # A reliable and entertaining source about time zones is
36 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
37
38 ###############################################################################
39
40 # United States
41
42 # From Paul Eggert (1999-03-31):
43 # Howse writes (pp 121-125) that time zones were invented by
44 # Professor Charles Ferdinand Dowd (1825-1904),
45 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
46 # His pamphlet "A System of National Time for Railroads" (1870)
47 # was the result of his proposals at the Convention of Railroad Trunk Lines
48 # in New York City (1869-10). His 1870 proposal was based on Washington, DC,
49 # but in 1872-05 he moved the proposed origin to Greenwich.
50
51 # From Paul Eggert (2016-09-21):
52 # Dowd's proposal left many details unresolved, such as where to draw
53 # lines between time zones. The key individual who made time zones
54 # work in the US was William Frederick Allen - railway engineer,
55 # managing editor of the Travelers' Guide, and secretary of the
56 # General Time Convention, a railway standardization group. Allen
57 # spent months in dialogs with scientific and railway leaders,
58 # developed a workable plan to institute time zones, and presented it
59 # to the General Time Convention on 1883-04-11, saying that his plan
60 # meant "local time would be practically abolished" - a plus for
61 # railway scheduling. By the next convention on 1883-10-11 nearly all
62 # railroads had agreed and it took effect on 1883-11-18 at 12:00.
63 # That Sunday was called the "day of two noons", as the eastern parts
64 # of the new zones observed noon twice. Allen witnessed the
65 # transition in New York City, writing:
66 #
67 # I heard the bells of St. Paul's strike on the old time. Four
68 # minutes later, obedient to the electrical signal from the Naval
69 # Observatory ... the time-ball made its rapid descent, the chimes
70 # of old Trinity rang twelve measured strokes, and local time was
71 # abandoned, probably forever.
72 #
73 # Most of the US soon followed suit. See:
74 # Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
75 # http://dx.doi.org/10.2307/3105430
76
77 # From Paul Eggert (2005-04-16):
78 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
79 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
80
81 # From Paul Eggert (2006-03-22):
82 # A good source for time zone historical data in the US is
83 # Thomas G. Shanks, The American Atlas (5th edition),
84 # San Diego: ACS Publications, Inc. (1991).
85 # Make sure you have the errata sheet; the book is somewhat useless without it.
430 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
431 # Officially this switch also included part of Sioux County, and
432 # Jones, Mellette, and Todd Counties in South Dakota;
433 # but in practice these other counties were already observing central time.
434 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
435 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
436 -7:00 US M%sT 2003 Oct 26 2:00
437 -6:00 US C%sT
438
439 # From Josh Findley (2011-01-21):
440 # ...it appears that Mercer County, North Dakota, changed from the
441 # mountain time zone to the central time zone at the last transition from
442 # daylight-saving to standard time (on Nov. 7, 2010):
443 # https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
444 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
445
446 # From Andy Lipscomb (2011-01-24):
447 # ...according to the Census Bureau, the largest city is Beulah (although
448 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
449 # largest city in Mercer County). Google Maps places Beulah's city hall
450 # at 47 degrees 15' 51" N, 101 degrees 46' 40" W, which yields an offset
451 # of 6h47'07".
452
453 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
454 -7:00 US M%sT 2010 Nov 7 2:00
455 -6:00 US C%sT
456
457 # US mountain time, represented by Denver
458 #
459 # Colorado, far western Kansas, Montana, western
460 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
461 # New Mexico, southwestern North Dakota,
462 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
463 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
464 #
465 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
466 Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
467 Rule Denver 1920 only - Oct lastSun 2:00 0 S
468 Rule Denver 1921 only - May 22 2:00 0 S
469 Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
470 Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
471 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
472 Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04
473 -7:00 US M%sT 1920
474 -7:00 Denver M%sT 1942
475 -7:00 US M%sT 1946
476 -7:00 Denver M%sT 1967
477 -7:00 US M%sT
478
479 # US Pacific time, represented by Los Angeles
480 #
481 # California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
482 # Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
483 # north of the Salmon River, and the towns of Burgdorf and Warren),
484 # Nevada (except West Wendover), Oregon (except the northern 3/4 of
485 # Malheur county), and Washington
486
487 # From Paul Eggert (2016-08-20):
488 # In early February 1948, in response to California's electricity shortage,
489 # PG&E changed power frequency from 60 to 59.5 Hz during daylight hours,
490 # causing electric clocks to lose six minutes per day. (This did not change
491 # legal time, and is not part of the data here.) See:
492 # Ross SA. An energy crisis from the past: Northern California in 1948.
493 # Working Paper No. 8, Institute of Governmental Studies, UC Berkeley,
494 # 1973-11. https://escholarship.org/uc/item/8x22k30c
495 #
496 # In another measure to save electricity, DST was instituted from 1948-03-14
497 # at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move
498 # the fallback transition earlier. See pages 3-4 of:
499 # http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf
500 #
501 # In response:
502 #
503 # Governor Warren received a torrent of objecting mail, and it is not too much
504 # to speculate that the objections to Daylight Saving Time were one important
962 Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
963 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
964 Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
965 -6:00 US C%sT 1946
966 -6:00 Pulaski C%sT 1961 Apr 30 2:00
967 -5:00 - EST 1969
968 -5:00 US E%sT 1971
969 -5:00 - EST 2006 Apr 2 2:00
970 -6:00 US C%sT 2007 Mar 11 2:00
971 -5:00 US E%sT
972 #
973 # Switzerland County, Indiana, did not observe DST from 1973 through 2005.
974 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
975 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
976 -6:00 US C%sT 1954 Apr 25 2:00
977 -5:00 - EST 1969
978 -5:00 US E%sT 1973
979 -5:00 - EST 2006
980 -5:00 US E%sT
981
982 # Part of Kentucky left its clocks alone in 1974.
983 # This also includes Clark, Floyd, and Harrison counties in Indiana.
984 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
985 Rule Louisville 1921 only - May 1 2:00 1:00 D
986 Rule Louisville 1921 only - Sep 1 2:00 0 S
987 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
988 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
989 Rule Louisville 1946 only - Jun 2 2:00 0 S
990 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
991 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
992 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
993 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
994 -6:00 US C%sT 1921
995 -6:00 Louisville C%sT 1942
996 -6:00 US C%sT 1946
997 -6:00 Louisville C%sT 1961 Jul 23 2:00
998 -5:00 - EST 1968
999 -5:00 US E%sT 1974 Jan 6 2:00
1000 -6:00 1:00 CDT 1974 Oct 27 2:00
1001 -5:00 US E%sT
3270 -6:00 Hond C%sT
3271 #
3272 # Great Swan I ceded by US to Honduras in 1972
3273
3274 # Jamaica
3275 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3276 # unspecified official document, and says "This time is used throughout the
3277 # island". Go with Milne. Round to the nearest second as required by zic.
3278 #
3279 # Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but
3280 # Lance Neita writes that Prime Minister Michael Manley decreed it January 5.
3281 # Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that
3282 # Manley's supporters associated this act with Manley's nickname "Joshua"
3283 # (recall that in the Bible the sun stood still at Joshua's request),
3284 # and with the Rod of Correction which Manley said he had received from
3285 # Haile Selassie, Emperor of Ethiopia. See:
3286 # Neita L. The politician in all of us. Jamaica Observer 2014-09-20
3287 # http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
3288 #
3289 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3290 Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3291 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3292 -5:00 - EST 1974
3293 -5:00 US E%sT 1984
3294 -5:00 - EST
3295
3296 # Martinique
3297 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3298 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3299 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3300 -4:00 - AST 1980 Apr 6
3301 -4:00 1:00 ADT 1980 Sep 28
3302 -4:00 - AST
3303
3304 # Montserrat
3305 # See America/Port_of_Spain.
3306
3307 # Nicaragua
3308 #
3309 # This uses Shanks & Pottenger for times before 2005.
3310 #
3311 # From Steffen Thorsen (2005-04-12):
3421 # Model this as a switch from EST/EDT to AST ...
3422 # From Chris Walton (2014-11-04):
3423 # ... the TCI government appears to have delayed the switch to
3424 # "permanent daylight saving time" by one year....
3425 # http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm
3426 #
3427 # From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen:
3428 # ... agreed to the reintroduction in TCI of Daylight Saving Time (DST)
3429 # during the summer months and Standard Time, also known as Local
3430 # Time, during the winter months with effect from April 2018 ...
3431 # https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3
3432 #
3433 # From Paul Eggert (2017-08-26):
3434 # The date of effect of the spring 2018 change appears to be March 11,
3435 # which makes more sense. See: Hamilton D. Time change back
3436 # by March 2018 for TCI. Magnetic Media. 2017-08-25.
3437 # http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/
3438 #
3439 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3440 Zone America/Grand_Turk -4:44:32 - LMT 1890
3441 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3442 -5:00 - EST 1979
3443 -5:00 US E%sT 2015 Nov Sun>=1 2:00
3444 -4:00 - AST 2018 Mar 11 3:00
3445 -5:00 US E%sT
3446
3447 # British Virgin Is
3448 # Virgin Is
3449 # See America/Port_of_Spain.
3450
3451
3452 # Local Variables:
3453 # coding: utf-8
3454 # End:
|
31 # tz@iana.org for general use in the future). For more, please see
32 # the file CONTRIBUTING in the tz distribution.
33
34 # From Paul Eggert (1999-03-22):
35 # A reliable and entertaining source about time zones is
36 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
37
38 ###############################################################################
39
40 # United States
41
42 # From Paul Eggert (1999-03-31):
43 # Howse writes (pp 121-125) that time zones were invented by
44 # Professor Charles Ferdinand Dowd (1825-1904),
45 # Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
46 # His pamphlet "A System of National Time for Railroads" (1870)
47 # was the result of his proposals at the Convention of Railroad Trunk Lines
48 # in New York City (1869-10). His 1870 proposal was based on Washington, DC,
49 # but in 1872-05 he moved the proposed origin to Greenwich.
50
51 # From Paul Eggert (2018-03-20):
52 # Dowd's proposal left many details unresolved, such as where to draw
53 # lines between time zones. The key individual who made time zones
54 # work in the US was William Frederick Allen - railway engineer,
55 # managing editor of the Travelers' Guide, and secretary of the
56 # General Time Convention, a railway standardization group. Allen
57 # spent months in dialogs with scientific and railway leaders,
58 # developed a workable plan to institute time zones, and presented it
59 # to the General Time Convention on 1883-04-11, saying that his plan
60 # meant "local time would be practically abolished" - a plus for
61 # railway scheduling. By the next convention on 1883-10-11 nearly all
62 # railroads had agreed and it took effect on 1883-11-18. That Sunday
63 # was called the "day of two noons", as some locations observed noon
64 # twice. Allen witnessed the transition in New York City, writing:
65 #
66 # I heard the bells of St. Paul's strike on the old time. Four
67 # minutes later, obedient to the electrical signal from the Naval
68 # Observatory ... the time-ball made its rapid descent, the chimes
69 # of old Trinity rang twelve measured strokes, and local time was
70 # abandoned, probably forever.
71 #
72 # Most of the US soon followed suit. See:
73 # Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
74 # 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.
429 # See <http://dmses.dot.gov/docimages/p63/135818.pdf>.
430 # Officially this switch also included part of Sioux County, and
431 # Jones, Mellette, and Todd Counties in South Dakota;
432 # but in practice these other counties were already observing central time.
433 # See <http://www.epa.gov/fedrgstr/EPA-IMPACT/2003/October/Day-28/i27056.htm>.
434 Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21
435 -7:00 US M%sT 2003 Oct 26 2:00
436 -6:00 US C%sT
437
438 # From Josh Findley (2011-01-21):
439 # ...it appears that Mercer County, North Dakota, changed from the
440 # mountain time zone to the central time zone at the last transition from
441 # daylight-saving to standard time (on Nov. 7, 2010):
442 # https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm
443 # http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html
444
445 # From Andy Lipscomb (2011-01-24):
446 # ...according to the Census Bureau, the largest city is Beulah (although
447 # it's commonly referred to as Beulah-Hazen, with Hazen being the next
448 # largest city in Mercer County). Google Maps places Beulah's city hall
449 # at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07".
450
451 Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
452 -7:00 US M%sT 2010 Nov 7 2:00
453 -6:00 US C%sT
454
455 # US mountain time, represented by Denver
456 #
457 # Colorado, far western Kansas, Montana, western
458 # Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
459 # New Mexico, southwestern North Dakota,
460 # western South Dakota, far western Texas (El Paso County, Hudspeth County,
461 # and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
462 #
463 # 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
483 # Malheur county), and Washington
484
485 # From Paul Eggert (2016-08-20):
486 # In early February 1948, in response to California's electricity shortage,
487 # PG&E changed power frequency from 60 to 59.5 Hz during daylight hours,
488 # causing electric clocks to lose six minutes per day. (This did not change
489 # legal time, and is not part of the data here.) See:
490 # Ross SA. An energy crisis from the past: Northern California in 1948.
491 # Working Paper No. 8, Institute of Governmental Studies, UC Berkeley,
492 # 1973-11. https://escholarship.org/uc/item/8x22k30c
493 #
494 # In another measure to save electricity, DST was instituted from 1948-03-14
495 # at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move
496 # the fallback transition earlier. See pages 3-4 of:
497 # http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf
498 #
499 # In response:
500 #
501 # Governor Warren received a torrent of objecting mail, and it is not too much
502 # to speculate that the objections to Daylight Saving Time were one important
960 Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
961 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
962 Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35
963 -6:00 US C%sT 1946
964 -6:00 Pulaski C%sT 1961 Apr 30 2:00
965 -5:00 - EST 1969
966 -5:00 US E%sT 1971
967 -5:00 - EST 2006 Apr 2 2:00
968 -6:00 US C%sT 2007 Mar 11 2:00
969 -5:00 US E%sT
970 #
971 # Switzerland County, Indiana, did not observe DST from 1973 through 2005.
972 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
973 Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44
974 -6:00 US C%sT 1954 Apr 25 2:00
975 -5:00 - EST 1969
976 -5:00 US E%sT 1973
977 -5:00 - EST 2006
978 -5:00 US E%sT
979
980 # From Paul Eggert (2018-03-20):
981 # The Louisville & Nashville Railroad's 1883-11-18 change occurred at
982 # 10:00 old local time; train were supposed to come to a standstill
983 # for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not
984 # clear how this matched civil time in Louisville, so for now continue
985 # to assume Louisville switched at noon new local time, like New York.
986 #
987 # Part of Kentucky left its clocks alone in 1974.
988 # This also includes Clark, Floyd, and Harrison counties in Indiana.
989 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
990 Rule Louisville 1921 only - May 1 2:00 1:00 D
991 Rule Louisville 1921 only - Sep 1 2:00 0 S
992 Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
993 Rule Louisville 1941 only - Sep lastSun 2:00 0 S
994 Rule Louisville 1946 only - Jun 2 2:00 0 S
995 Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
996 Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
997 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
998 Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58
999 -6:00 US C%sT 1921
1000 -6:00 Louisville C%sT 1942
1001 -6:00 US C%sT 1946
1002 -6:00 Louisville C%sT 1961 Jul 23 2:00
1003 -5:00 - EST 1968
1004 -5:00 US E%sT 1974 Jan 6 2:00
1005 -6:00 1:00 CDT 1974 Oct 27 2:00
1006 -5:00 US E%sT
3275 -6:00 Hond C%sT
3276 #
3277 # Great Swan I ceded by US to Honduras in 1972
3278
3279 # Jamaica
3280 # Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3281 # unspecified official document, and says "This time is used throughout the
3282 # island". Go with Milne. Round to the nearest second as required by zic.
3283 #
3284 # Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but
3285 # Lance Neita writes that Prime Minister Michael Manley decreed it January 5.
3286 # Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that
3287 # Manley's supporters associated this act with Manley's nickname "Joshua"
3288 # (recall that in the Bible the sun stood still at Joshua's request),
3289 # and with the Rod of Correction which Manley said he had received from
3290 # Haile Selassie, Emperor of Ethiopia. See:
3291 # Neita L. The politician in all of us. Jamaica Observer 2014-09-20
3292 # http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
3293 #
3294 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3295 Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston
3296 -5:07:10 - KMT 1912 Feb # Kingston Mean Time
3297 -5:00 - EST 1974
3298 -5:00 US E%sT 1984
3299 -5:00 - EST
3300
3301 # Martinique
3302 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3303 Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3304 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3305 -4:00 - AST 1980 Apr 6
3306 -4:00 1:00 ADT 1980 Sep 28
3307 -4:00 - AST
3308
3309 # Montserrat
3310 # See America/Port_of_Spain.
3311
3312 # Nicaragua
3313 #
3314 # This uses Shanks & Pottenger for times before 2005.
3315 #
3316 # From Steffen Thorsen (2005-04-12):
3426 # Model this as a switch from EST/EDT to AST ...
3427 # From Chris Walton (2014-11-04):
3428 # ... the TCI government appears to have delayed the switch to
3429 # "permanent daylight saving time" by one year....
3430 # http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm
3431 #
3432 # From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen:
3433 # ... agreed to the reintroduction in TCI of Daylight Saving Time (DST)
3434 # during the summer months and Standard Time, also known as Local
3435 # Time, during the winter months with effect from April 2018 ...
3436 # https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3
3437 #
3438 # From Paul Eggert (2017-08-26):
3439 # The date of effect of the spring 2018 change appears to be March 11,
3440 # which makes more sense. See: Hamilton D. Time change back
3441 # by March 2018 for TCI. Magnetic Media. 2017-08-25.
3442 # http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/
3443 #
3444 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
3445 Zone America/Grand_Turk -4:44:32 - LMT 1890
3446 -5:07:10 - KMT 1912 Feb # Kingston Mean Time
3447 -5:00 - EST 1979
3448 -5:00 US E%sT 2015 Nov Sun>=1 2:00
3449 -4:00 - AST 2018 Mar 11 3:00
3450 -5:00 US E%sT
3451
3452 # British Virgin Is
3453 # Virgin Is
3454 # See America/Port_of_Spain.
3455
3456
3457 # Local Variables:
3458 # coding: utf-8
3459 # End:
|