1# <pre>
2# This file is in the public domain, so clarified as of
3# 2009-05-17 by Arthur David Olson.
4
5# also includes Central America and the Caribbean
6
7# This data is by no means authoritative; if you think you know better,
8# go ahead and edit the file (and please send any changes to
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15###############################################################################
16
17# United States
18
19# From Paul Eggert (1999-03-31):
20# Howse writes (pp 121-125) that time zones were invented by
21# Professor Charles Ferdinand Dowd (1825-1904),
22# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
23# His pamphlet "A System of National Time for Railroads" (1870)
24# was the result of his proposals at the Convention of Railroad Trunk Lines
25# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
26# but in 1872-05 he moved the proposed origin to Greenwich.
27# His proposal was adopted by the railroads on 1883-11-18 at 12:00,
28# and the most of the country soon followed suit.
29
30# From Paul Eggert (2005-04-16):
31# That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
32# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
33
34# From Paul Eggert (2006-03-22):
35# A good source for time zone historical data in the US is
36# Thomas G. Shanks, The American Atlas (5th edition),
37# San Diego: ACS Publications, Inc. (1991).
38# Make sure you have the errata sheet; the book is somewhat useless without it.
39# It is the source for most of the pre-1991 US entries below.
40
41# From Paul Eggert (2001-03-06):
42# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
43# in his whimsical essay "An Economical Project for Diminishing the Cost
44# of Light" published in the Journal de Paris (1784-04-26).
45# Not everyone is happy with the results:
46#
47# I don't really care how time is reckoned so long as there is some
48# agreement about it, but I object to being told that I am saving
49# daylight when my reason tells me that I am doing nothing of the kind.
50# I even object to the implication that I am wasting something
51# valuable if I stay in bed after the sun has risen. As an admirer
52# of moonlight I resent the bossy insistence of those who want to
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162# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
163# Nome Standard Time (NT) Bering Standard Time (BST)
164#
165# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
166# The YST zone now covers nearly all of the state, AHST just part
167# of the Aleutian islands. No DST.
168
169# From Paul Eggert (1995-12-19):
170# The tables below use 'NST', not 'NT', for Nome Standard Time.
171# I invented 'CAWT' for Central Alaska War Time.
172
173# From U. S. Naval Observatory (1989-01-19):
174# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
175# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
176# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
177# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
178# USA MOUNTAIN 7 H BEHIND UTC DENVER
179# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
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232# See the file "australasia".
233
234# From Arthur David Olson, 2005-08-09
235# The following was signed into law on 2005-08-08.
236#
237# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
238# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15
239# U.S.C. 260a(a)) is amended--
240# (1) by striking 'first Sunday of April' and inserting 'second
241# Sunday of March'; and
242# (2) by striking 'last Sunday of October' and inserting 'first
243# Sunday of November'.
244# (b) Effective Date- Subsection (a) shall take effect 1 year after the
245# date of enactment of this Act or March 1, 2007, whichever is later.
246# (c) Report to Congress- Not later than 9 months after the effective
247# date stated in subsection (b), the Secretary shall report to Congress
248# on the impact of this section on energy consumption in the United
249# States.
250# (d) Right to Revert- Congress retains the right to revert the
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595Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 #Schmitt&Cox
596 -10:30 - HST 1933 Apr 30 2:00 #Laws 1933
597 -10:30 1:00 HDT 1933 May 21 12:00 #Laws 1933+12
598 -10:30 - HST 1942 Feb 09 2:00 #Schmitt&Cox+2
599 -10:30 1:00 HDT 1945 Sep 30 2:00 #Schmitt&Cox+2
600 -10:30 - HST 1947 Jun 8 2:00 #Schmitt&Cox+2
601 -10:00 - HST
602
603Link Pacific/Honolulu Pacific/Johnston
604
605# Now we turn to US areas that have diverged from the consensus since 1970.
606
607# Arizona mostly uses MST.
608
609# From Paul Eggert (2002-10-20):
610#
611# The information in the rest of this paragraph is derived from the
612# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
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633 -7:00 US M%sT 1968 Mar 21
634 -7:00 - MST
635# From Arthur David Olson (1988-02-13):
636# A writer from the Inter Tribal Council of Arizona, Inc.,
637# notes in private correspondence dated 1987-12-28 that "Presently, only the
638# Navajo Nation participates in the Daylight Saving Time policy, due to its
639# large size and location in three states." (The "only" means that other
640# tribal nations don't use DST.)
641#
642# From Paul Eggert (2013-08-26):
643# See America/Denver for a zone appropriate for the Navajo Nation.
644
645# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
646# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
647# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
648# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
649# Teton, Twin Falls, Valley, Washington counties, and the southern
650# quarter of Idaho county) and eastern Oregon (most of Malheur County)
651# switched four weeks late in 1974.
652#
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675#
676# - Clark, Floyd, and Harrison counties have been like
677# America/Kentucky/Louisville.
678#
679# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
680# and Switzerland counties have their own time zone histories as noted below.
681#
682# Shanks partitioned Indiana into 345 regions, each with its own time history,
683# and wrote "Even newspaper reports present contradictory information."
684# Those Hoosiers! Such a flighty and changeable people!
685# Fortunately, most of the complexity occurred before our cutoff date of 1970.
686#
687# Other than Indianapolis, the Indiana place names are so nondescript
688# that they would be ambiguous if we left them at the 'America' level.
689# So we reluctantly put them all in a subdirectory 'America/Indiana'.
690
691# From Paul Eggert (2005-08-16):
692# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
693
694# From Nathan Stratton Treadway (2006-03-30):
695# http://www.dot.gov/affairs/dot0406.htm [3705 B]
696# From Deborah Goldsmith (2006-01-18):
697# http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
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945# was rescinded and the city reverted to Sun time. A derisive offer to
946# erect a sundial in front of the city hall was referred to the
947# Committee on Sewers. Then, in 1905, Central time was adopted
948# by city vote.
949#
950# This story is too entertaining to be false, so go with Howse over Shanks.
951#
952# From Paul Eggert (2001-03-06):
953# Garland (1927) writes "Cleveland and Detroit advanced their clocks
954# one hour in 1914." This change is not in Shanks. We have no more
955# info, so omit this for now.
956#
957# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
958# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
959Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
960Rule Detroit 1948 only - Sep lastSun 2:00 0 S
961Rule Detroit 1967 only - Jun 14 2:00 1:00 D
962Rule Detroit 1967 only - Oct lastSun 2:00 0 S
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986
987# Navassa
988# administered by the US Fish and Wildlife Service
989# claimed by US under the provisions of the 1856 Guano Islands Act
990# also claimed by Haiti
991# occupied 1857/1900 by the Navassa Phosphate Co
992# US lighthouse 1917/1996-09
993# currently uninhabited
994# see Mark Fineman, "An Isle Rich in Guano and Discord",
995# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
996# Jimmy Skaggs, _The Great Guano Rush_ (1994).
997
998################################################################################
999
1000
1001# From Paul Eggert (2006-03-22):
1002# A good source for time zone historical data outside the U.S. is
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1020#
1021# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
1022# William Willett, The Waste of Daylight, 19th edition
1023# </a> (1914-03)
1024#
1025# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1026# <http://www.jstor.org/stable/1774359>.
1027#
1028# See the 'europe' file for Greenland.
1029
1030# Canada
1031
1032# From Alain LaBont<e'> (1994-11-14):
1033# I post here the time zone abbreviations standardized in Canada
1034# for both English and French in the CAN/CSA-Z234.4-89 standard....
1035#
1036# UTC Standard time Daylight savings time
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1221 -3:30:52 StJohns N%sT 1935 Mar 30
1222 -3:30 StJohns N%sT 1942 May 11
1223 -3:30 Canada N%sT 1946
1224 -3:30 StJohns N%sT 2011 Nov
1225 -3:30 Canada N%sT
1226
1227# most of east Labrador
1228
1229# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'.
1230# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1231Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1232 -3:30:52 - NST 1918
1233 -3:30:52 Canada N%sT 1919
1234 -3:30:52 - NST 1935 Mar 30
1235 -3:30 - NST 1936
1236 -3:30 StJohns N%sT 1942 May 11
1237 -3:30 Canada N%sT 1946
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1338 -4:00 Canada A%sT 1946
1339 -4:00 Moncton A%sT 1973
1340 -4:00 Canada A%sT 1993
1341 -4:00 Moncton A%sT 2007
1342 -4:00 Canada A%sT
1343
1344# Quebec
1345
1346# From Paul Eggert (2013-08-30):
1347# Since 1970 most of Quebec has been like Toronto.
1348# However, because earlier versions of the tz database mistakenly relied on data
1349# from Shanks & Pottenger saying that Quebec differed from Ontario after 1970,
1350# a separate entry was created for most of Quebec. We're loath to lose
1351# its pre-1970 info, even though the tz database is normally limited to
1352# zones that differ after 1970, so keep this otherwise out-of-scope entry.
1353
1354# Matthews and Vincent (1998) also write that Quebec east of the -63
1355# meridian is supposed to observe AST, but residents as far east as
1356# Natashquan use EST/EDT, and residents east of Natashquan use AST.
1357# The Quebec department of justice writes in
1358# "The situation in Minganie and Basse-Cote-Nord"
1359# http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1360# that the coastal strip from just east of Natashquan to Blanc-Sablon
1361# observes Atlantic standard time all year round.
1362# http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1363# says this common practice was codified into law as of 2007.
1364# For lack of better info, guess this practice began around 1970, contra to
1365# Shanks & Pottenger who have this region observing AST/ADT.
1366# for post-1970 data America/Puerto_Rico.
1367
1368# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1369Rule Mont 1917 only - Mar 25 2:00 1:00 D
1370Rule Mont 1917 only - Apr 24 0:00 0 S
1371Rule Mont 1919 only - Mar 31 2:30 1:00 D
1372Rule Mont 1919 only - Oct 25 2:30 0 S
1373Rule Mont 1920 only - May 2 2:30 1:00 D
1374Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
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1402Zone America/Montreal -4:54:16 - LMT 1884
1403 -5:00 Mont E%sT 1918
1404 -5:00 Canada E%sT 1919
1405 -5:00 Mont E%sT 1942 Feb 9 2:00s
1406 -5:00 Canada E%sT 1946
1407 -5:00 Mont E%sT 1974
1408 -5:00 Canada E%sT
1409
1410# Ontario
1411
1412# From Paul Eggert (2006-07-09):
1413# Shanks & Pottenger write that since 1970 most of Ontario has been like
1414# Toronto.
1415# Thunder Bay skipped DST in 1973.
1416# Many smaller locales did not observe peacetime DST until 1974;
1417# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
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1620 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1621 -5:00 Canada E%sT 1946
1622 -5:00 Toronto E%sT 1974
1623 -5:00 Canada E%sT
1624Zone America/Thunder_Bay -5:57:00 - LMT 1895
1625 -6:00 - CST 1910
1626 -5:00 - EST 1942
1627 -5:00 Canada E%sT 1970
1628 -5:00 Toronto E%sT 1973
1629 -5:00 - EST 1974
1630 -5:00 Canada E%sT
1631Zone America/Nipigon -5:53:04 - LMT 1895
1632 -5:00 Canada E%sT 1940 Sep 29
1633 -5:00 1:00 EDT 1942 Feb 9 2:00s
1634 -5:00 Canada E%sT
1635Zone America/Rainy_River -6:18:16 - LMT 1895
1636 -6:00 Canada C%sT 1940 Sep 29
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2207# General: GMT+6
2208#
2209# The Decree was published in Mexico's Official Newspaper on January 4th.
2210#
2211# -------------- End Forwarded Message --------------
2212# From Paul Eggert (1996-06-12):
2213# For an English translation of the decree, see
2214# <a href="http://mexico-travel.com/extra/timezone_eng.html">
2215# "Diario Oficial: Time Zone Changeover" (1996-01-04).
2216# </a>
2217
2218# From Rives McDow (1998-10-08):
2219# The State of Quintana Roo has reverted back to central STD and DST times
2220# (i.e. UTC -0600 and -0500 as of 1998-08-02).
2221
2222# From Rives McDow (2000-01-10):
2223# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
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2544# name or contents should be.
2545#
2546# Revillagigedo Is
2547# no information
2548
2549###############################################################################
2550
2551# Anguilla
2552# See 'southamerica'.
2553
2554# Antigua and Barbuda
2555# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2556Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2557 -5:00 - EST 1951
2558 -4:00 - AST
2559
2560# Bahamas
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2613# in March, until the first Sunday in November. And, after the Time Zone
2614# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2615# Friday, the same thing will happen in Bermuda.
2616# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2617
2618# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2619Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2620 -4:00 - AST 1974 Apr 28 2:00
2621 -4:00 Canada A%sT 1976
2622 -4:00 US A%sT
2623
2624# Cayman Is
2625# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2626Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2627 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
2628 -5:00 - EST
2629
2630# Costa Rica
2631
2632# Milne gives -5:36:13.3 as San Jose mean time; round to nearest.
2633
2634# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2635Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2636Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2637Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2638# IATA SSIM (1991-09) says the following was at 1:00;
2639# go with Shanks & Pottenger.
2640Rule CR 1991 only - Jul 1 0:00 0 S
2641Rule CR 1992 only - Mar 15 0:00 0 S
2642# There are too many San Joses elsewhere, so we'll use 'Costa Rica'.
2643# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2644Zone America/Costa_Rica -5:36:13 - LMT 1890 # San Jose
2645 -5:36:13 - SJMT 1921 Jan 15 # San Jose Mean Time
2646 -6:00 CR C%sT
2647# Coco
2648# no information; probably like America/Costa_Rica
2649
2650# Cuba
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2866Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2867
2868# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2869Zone America/Havana -5:29:28 - LMT 1890
2870 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2871 -5:00 Cuba C%sT
2872
2873# Dominica
2874# See 'southamerica'.
2875
2876# Dominican Republic
2877
2878# From Steffen Thorsen (2000-10-30):
2879# Enrique Morales reported to me that the Dominican Republic has changed the
2880# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2881# http://www.listin.com.do/antes/261000/republica/princi.html
2882
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2915Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2916# There are too many San Salvadors elsewhere, so use America/El_Salvador
2917# instead of America/San_Salvador.
2918# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2919Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2920 -6:00 Salv C%sT
2921
2922# Grenada
2923# Guadeloupe
2924# St Barthelemy
2925# St Martin (French part)
2926# See 'southamerica'.
2927
2928# Guatemala
2929#
2930# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2931# Diario Co Latino, at
2932# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2933# says in an article dated 2006-04-19 that the Guatemalan government had
2934# decided on that date to advance official time by 60 minutes, to lessen the
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3061Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3062# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3063Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3064 -6:00 Hond C%sT
3065#
3066# Great Swan I ceded by US to Honduras in 1972
3067
3068# Jamaica
3069# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3070# unspecified official document, and says "This time is used throughout the
3071# island". Go with Milne. Round to the nearest second as required by zic.
3072# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3073Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3074 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3075 -5:00 - EST 1974 Apr 28 2:00
3076 -5:00 US E%sT 1984
3077 -5:00 - EST
3078
3079# Martinique
3080# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3081Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3082 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3083 -4:00 - AST 1980 Apr 6
3084 -4:00 1:00 ADT 1980 Sep 28
3085 -4:00 - AST
3086
3087# Montserrat
3088# See 'southamerica'.
3089
3090# Nicaragua
3091#
3092# This uses Shanks & Pottenger for times before 2005.
3093#
3094# From Steffen Thorsen (2005-04-12):
3095# I've got reports from 8 different people that Nicaragua just started
3096# DST on Sunday 2005-04-10, in order to save energy because of
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3154
3155# Panama
3156# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3157Zone America/Panama -5:18:08 - LMT 1890
3158 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
3159 -5:00 - EST
3160
3161# Puerto Rico
3162# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3163# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3164Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3165 -4:00 - AST 1942 May 3
3166 -4:00 US A%sT 1946
3167 -4:00 - AST
3168
3169# St Kitts-Nevis
3170# St Lucia
3171# See 'southamerica'.
3172
3173# St Pierre and Miquelon
3174# There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3175# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3176Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3177 -4:00 - AST 1980 May
3178 -3:00 - PMST 1987 # Pierre & Miquelon Time
3179 -3:00 Canada PM%sT
3180
3181# St Vincent and the Grenadines
3182# See 'southamerica'.
3183
3184# Turks and Caicos
3185#
3186# From Chris Dunn in
3187# <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
3188# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3189# daylight saving dates for time changes have been adjusted to match
3190# the recent U.S. change of dates.
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3204# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3205Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
3206Rule TC 1979 2006 - Oct lastSun 2:00 0 S
3207Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
3208Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
3209Rule TC 2007 max - Nov Sun>=1 2:00 0 S
3210# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3211Zone America/Grand_Turk -4:44:32 - LMT 1890
3212 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3213 -5:00 TC E%sT
3214
3215# British Virgin Is
3216# Virgin Is
3217# See 'southamerica'.
2# This file is in the public domain, so clarified as of
3# 2009-05-17 by Arthur David Olson.
4
5# also includes Central America and the Caribbean
6
7# This data is by no means authoritative; if you think you know better,
8# go ahead and edit the file (and please send any changes to
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15###############################################################################
16
17# United States
18
19# From Paul Eggert (1999-03-31):
20# Howse writes (pp 121-125) that time zones were invented by
21# Professor Charles Ferdinand Dowd (1825-1904),
22# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
23# His pamphlet "A System of National Time for Railroads" (1870)
24# was the result of his proposals at the Convention of Railroad Trunk Lines
25# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
26# but in 1872-05 he moved the proposed origin to Greenwich.
27# His proposal was adopted by the railroads on 1883-11-18 at 12:00,
28# and the most of the country soon followed suit.
29
30# From Paul Eggert (2005-04-16):
31# That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
32# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
33
34# From Paul Eggert (2006-03-22):
35# A good source for time zone historical data in the US is
36# Thomas G. Shanks, The American Atlas (5th edition),
37# San Diego: ACS Publications, Inc. (1991).
38# Make sure you have the errata sheet; the book is somewhat useless without it.
39# It is the source for most of the pre-1991 US entries below.
40
41# From Paul Eggert (2001-03-06):
42# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
43# in his whimsical essay "An Economical Project for Diminishing the Cost
44# of Light" published in the Journal de Paris (1784-04-26).
45# Not everyone is happy with the results:
46#
47# I don't really care how time is reckoned so long as there is some
48# agreement about it, but I object to being told that I am saving
49# daylight when my reason tells me that I am doing nothing of the kind.
50# I even object to the implication that I am wasting something
51# valuable if I stay in bed after the sun has risen. As an admirer
52# of moonlight I resent the bossy insistence of those who want to
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162# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
163# Nome Standard Time (NT) Bering Standard Time (BST)
164#
165# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
166# The YST zone now covers nearly all of the state, AHST just part
167# of the Aleutian islands. No DST.
168
169# From Paul Eggert (1995-12-19):
170# The tables below use 'NST', not 'NT', for Nome Standard Time.
171# I invented 'CAWT' for Central Alaska War Time.
172
173# From U. S. Naval Observatory (1989-01-19):
174# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
175# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
176# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
177# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
178# USA MOUNTAIN 7 H BEHIND UTC DENVER
179# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
--- 52 unchanged lines hidden (view full) ---
232# See the file "australasia".
233
234# From Arthur David Olson, 2005-08-09
235# The following was signed into law on 2005-08-08.
236#
237# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
238# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15
239# U.S.C. 260a(a)) is amended--
240# (1) by striking 'first Sunday of April' and inserting 'second
241# Sunday of March'; and
242# (2) by striking 'last Sunday of October' and inserting 'first
243# Sunday of November'.
244# (b) Effective Date- Subsection (a) shall take effect 1 year after the
245# date of enactment of this Act or March 1, 2007, whichever is later.
246# (c) Report to Congress- Not later than 9 months after the effective
247# date stated in subsection (b), the Secretary shall report to Congress
248# on the impact of this section on energy consumption in the United
249# States.
250# (d) Right to Revert- Congress retains the right to revert the
--- 344 unchanged lines hidden (view full) ---
595Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 #Schmitt&Cox
596 -10:30 - HST 1933 Apr 30 2:00 #Laws 1933
597 -10:30 1:00 HDT 1933 May 21 12:00 #Laws 1933+12
598 -10:30 - HST 1942 Feb 09 2:00 #Schmitt&Cox+2
599 -10:30 1:00 HDT 1945 Sep 30 2:00 #Schmitt&Cox+2
600 -10:30 - HST 1947 Jun 8 2:00 #Schmitt&Cox+2
601 -10:00 - HST
602
603Link Pacific/Honolulu Pacific/Johnston
604
605# Now we turn to US areas that have diverged from the consensus since 1970.
606
607# Arizona mostly uses MST.
608
609# From Paul Eggert (2002-10-20):
610#
611# The information in the rest of this paragraph is derived from the
612# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
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633 -7:00 US M%sT 1968 Mar 21
634 -7:00 - MST
635# From Arthur David Olson (1988-02-13):
636# A writer from the Inter Tribal Council of Arizona, Inc.,
637# notes in private correspondence dated 1987-12-28 that "Presently, only the
638# Navajo Nation participates in the Daylight Saving Time policy, due to its
639# large size and location in three states." (The "only" means that other
640# tribal nations don't use DST.)
641#
642# From Paul Eggert (2013-08-26):
643# See America/Denver for a zone appropriate for the Navajo Nation.
644
645# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
646# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
647# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
648# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
649# Teton, Twin Falls, Valley, Washington counties, and the southern
650# quarter of Idaho county) and eastern Oregon (most of Malheur County)
651# switched four weeks late in 1974.
652#
--- 22 unchanged lines hidden (view full) ---
675#
676# - Clark, Floyd, and Harrison counties have been like
677# America/Kentucky/Louisville.
678#
679# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
680# and Switzerland counties have their own time zone histories as noted below.
681#
682# Shanks partitioned Indiana into 345 regions, each with its own time history,
683# and wrote "Even newspaper reports present contradictory information."
684# Those Hoosiers! Such a flighty and changeable people!
685# Fortunately, most of the complexity occurred before our cutoff date of 1970.
686#
687# Other than Indianapolis, the Indiana place names are so nondescript
688# that they would be ambiguous if we left them at the 'America' level.
689# So we reluctantly put them all in a subdirectory 'America/Indiana'.
690
691# From Paul Eggert (2005-08-16):
692# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
693
694# From Nathan Stratton Treadway (2006-03-30):
695# http://www.dot.gov/affairs/dot0406.htm [3705 B]
696# From Deborah Goldsmith (2006-01-18):
697# http://dmses.dot.gov/docimages/pdf95/382329_web.pdf [2.9 MB]
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945# was rescinded and the city reverted to Sun time. A derisive offer to
946# erect a sundial in front of the city hall was referred to the
947# Committee on Sewers. Then, in 1905, Central time was adopted
948# by city vote.
949#
950# This story is too entertaining to be false, so go with Howse over Shanks.
951#
952# From Paul Eggert (2001-03-06):
953# Garland (1927) writes "Cleveland and Detroit advanced their clocks
954# one hour in 1914." This change is not in Shanks. We have no more
955# info, so omit this for now.
956#
957# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
958# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
959Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
960Rule Detroit 1948 only - Sep lastSun 2:00 0 S
961Rule Detroit 1967 only - Jun 14 2:00 1:00 D
962Rule Detroit 1967 only - Oct lastSun 2:00 0 S
--- 23 unchanged lines hidden (view full) ---
986
987# Navassa
988# administered by the US Fish and Wildlife Service
989# claimed by US under the provisions of the 1856 Guano Islands Act
990# also claimed by Haiti
991# occupied 1857/1900 by the Navassa Phosphate Co
992# US lighthouse 1917/1996-09
993# currently uninhabited
994# see Mark Fineman, "An Isle Rich in Guano and Discord",
995# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
996# Jimmy Skaggs, _The Great Guano Rush_ (1994).
997
998################################################################################
999
1000
1001# From Paul Eggert (2006-03-22):
1002# A good source for time zone historical data outside the U.S. is
--- 17 unchanged lines hidden (view full) ---
1020#
1021# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
1022# William Willett, The Waste of Daylight, 19th edition
1023# </a> (1914-03)
1024#
1025# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
1026# <http://www.jstor.org/stable/1774359>.
1027#
1028# See the 'europe' file for Greenland.
1029
1030# Canada
1031
1032# From Alain LaBont<e'> (1994-11-14):
1033# I post here the time zone abbreviations standardized in Canada
1034# for both English and French in the CAN/CSA-Z234.4-89 standard....
1035#
1036# UTC Standard time Daylight savings time
--- 184 unchanged lines hidden (view full) ---
1221 -3:30:52 StJohns N%sT 1935 Mar 30
1222 -3:30 StJohns N%sT 1942 May 11
1223 -3:30 Canada N%sT 1946
1224 -3:30 StJohns N%sT 2011 Nov
1225 -3:30 Canada N%sT
1226
1227# most of east Labrador
1228
1229# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'.
1230# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1231Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
1232 -3:30:52 - NST 1918
1233 -3:30:52 Canada N%sT 1919
1234 -3:30:52 - NST 1935 Mar 30
1235 -3:30 - NST 1936
1236 -3:30 StJohns N%sT 1942 May 11
1237 -3:30 Canada N%sT 1946
--- 100 unchanged lines hidden (view full) ---
1338 -4:00 Canada A%sT 1946
1339 -4:00 Moncton A%sT 1973
1340 -4:00 Canada A%sT 1993
1341 -4:00 Moncton A%sT 2007
1342 -4:00 Canada A%sT
1343
1344# Quebec
1345
1346# From Paul Eggert (2013-08-30):
1347# Since 1970 most of Quebec has been like Toronto.
1348# However, because earlier versions of the tz database mistakenly relied on data
1349# from Shanks & Pottenger saying that Quebec differed from Ontario after 1970,
1350# a separate entry was created for most of Quebec. We're loath to lose
1351# its pre-1970 info, even though the tz database is normally limited to
1352# zones that differ after 1970, so keep this otherwise out-of-scope entry.
1353
1354# Matthews and Vincent (1998) also write that Quebec east of the -63
1355# meridian is supposed to observe AST, but residents as far east as
1356# Natashquan use EST/EDT, and residents east of Natashquan use AST.
1357# The Quebec department of justice writes in
1358# "The situation in Minganie and Basse-Cote-Nord"
1359# http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1360# that the coastal strip from just east of Natashquan to Blanc-Sablon
1361# observes Atlantic standard time all year round.
1362# http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1363# says this common practice was codified into law as of 2007.
1364# For lack of better info, guess this practice began around 1970, contra to
1365# Shanks & Pottenger who have this region observing AST/ADT.
1366# for post-1970 data America/Puerto_Rico.
1367
1368# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1369Rule Mont 1917 only - Mar 25 2:00 1:00 D
1370Rule Mont 1917 only - Apr 24 0:00 0 S
1371Rule Mont 1919 only - Mar 31 2:30 1:00 D
1372Rule Mont 1919 only - Oct 25 2:30 0 S
1373Rule Mont 1920 only - May 2 2:30 1:00 D
1374Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
--- 27 unchanged lines hidden (view full) ---
1402Zone America/Montreal -4:54:16 - LMT 1884
1403 -5:00 Mont E%sT 1918
1404 -5:00 Canada E%sT 1919
1405 -5:00 Mont E%sT 1942 Feb 9 2:00s
1406 -5:00 Canada E%sT 1946
1407 -5:00 Mont E%sT 1974
1408 -5:00 Canada E%sT
1409
1410# Ontario
1411
1412# From Paul Eggert (2006-07-09):
1413# Shanks & Pottenger write that since 1970 most of Ontario has been like
1414# Toronto.
1415# Thunder Bay skipped DST in 1973.
1416# Many smaller locales did not observe peacetime DST until 1974;
1417# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
--- 202 unchanged lines hidden (view full) ---
1620 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1621 -5:00 Canada E%sT 1946
1622 -5:00 Toronto E%sT 1974
1623 -5:00 Canada E%sT
1624Zone America/Thunder_Bay -5:57:00 - LMT 1895
1625 -6:00 - CST 1910
1626 -5:00 - EST 1942
1627 -5:00 Canada E%sT 1970
1628 -5:00 Toronto E%sT 1973
1629 -5:00 - EST 1974
1630 -5:00 Canada E%sT
1631Zone America/Nipigon -5:53:04 - LMT 1895
1632 -5:00 Canada E%sT 1940 Sep 29
1633 -5:00 1:00 EDT 1942 Feb 9 2:00s
1634 -5:00 Canada E%sT
1635Zone America/Rainy_River -6:18:16 - LMT 1895
1636 -6:00 Canada C%sT 1940 Sep 29
--- 570 unchanged lines hidden (view full) ---
2207# General: GMT+6
2208#
2209# The Decree was published in Mexico's Official Newspaper on January 4th.
2210#
2211# -------------- End Forwarded Message --------------
2212# From Paul Eggert (1996-06-12):
2213# For an English translation of the decree, see
2214# <a href="http://mexico-travel.com/extra/timezone_eng.html">
2215# "Diario Oficial: Time Zone Changeover" (1996-01-04).
2216# </a>
2217
2218# From Rives McDow (1998-10-08):
2219# The State of Quintana Roo has reverted back to central STD and DST times
2220# (i.e. UTC -0600 and -0500 as of 1998-08-02).
2221
2222# From Rives McDow (2000-01-10):
2223# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
--- 320 unchanged lines hidden (view full) ---
2544# name or contents should be.
2545#
2546# Revillagigedo Is
2547# no information
2548
2549###############################################################################
2550
2551# Anguilla
2552# See 'southamerica'.
2553
2554# Antigua and Barbuda
2555# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2556Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
2557 -5:00 - EST 1951
2558 -4:00 - AST
2559
2560# Bahamas
--- 52 unchanged lines hidden (view full) ---
2613# in March, until the first Sunday in November. And, after the Time Zone
2614# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
2615# Friday, the same thing will happen in Bermuda.
2616# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
2617
2618# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2619Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2620 -4:00 - AST 1974 Apr 28 2:00
2621 -4:00 Canada A%sT 1976
2622 -4:00 US A%sT
2623
2624# Cayman Is
2625# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2626Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2627 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
2628 -5:00 - EST
2629
2630# Costa Rica
2631
2632# Milne gives -5:36:13.3 as San Jose mean time; round to nearest.
2633
2634# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
2635Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
2636Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
2637Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
2638# IATA SSIM (1991-09) says the following was at 1:00;
2639# go with Shanks & Pottenger.
2640Rule CR 1991 only - Jul 1 0:00 0 S
2641Rule CR 1992 only - Mar 15 0:00 0 S
2642# There are too many San Joses elsewhere, so we'll use 'Costa Rica'.
2643# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2644Zone America/Costa_Rica -5:36:13 - LMT 1890 # San Jose
2645 -5:36:13 - SJMT 1921 Jan 15 # San Jose Mean Time
2646 -6:00 CR C%sT
2647# Coco
2648# no information; probably like America/Costa_Rica
2649
2650# Cuba
--- 215 unchanged lines hidden (view full) ---
2866Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D
2867
2868# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2869Zone America/Havana -5:29:28 - LMT 1890
2870 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
2871 -5:00 Cuba C%sT
2872
2873# Dominica
2874# See 'southamerica'.
2875
2876# Dominican Republic
2877
2878# From Steffen Thorsen (2000-10-30):
2879# Enrique Morales reported to me that the Dominican Republic has changed the
2880# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
2881# http://www.listin.com.do/antes/261000/republica/princi.html
2882
--- 32 unchanged lines hidden (view full) ---
2915Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
2916# There are too many San Salvadors elsewhere, so use America/El_Salvador
2917# instead of America/San_Salvador.
2918# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2919Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
2920 -6:00 Salv C%sT
2921
2922# Grenada
2923# Guadeloupe
2924# St Barthelemy
2925# St Martin (French part)
2926# See 'southamerica'.
2927
2928# Guatemala
2929#
2930# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
2931# Diario Co Latino, at
2932# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079,
2933# says in an article dated 2006-04-19 that the Guatemalan government had
2934# decided on that date to advance official time by 60 minutes, to lessen the
--- 126 unchanged lines hidden (view full) ---
3061Rule Hond 2006 only - Aug Mon>=1 0:00 0 S
3062# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3063Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
3064 -6:00 Hond C%sT
3065#
3066# Great Swan I ceded by US to Honduras in 1972
3067
3068# Jamaica
3069# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3070# unspecified official document, and says "This time is used throughout the
3071# island". Go with Milne. Round to the nearest second as required by zic.
3072# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3073Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3074 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3075 -5:00 - EST 1974 Apr 28 2:00
3076 -5:00 US E%sT 1984
3077 -5:00 - EST
3078
3079# Martinique
3080# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3081Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
3082 -4:04:20 - FFMT 1911 May # Fort-de-France MT
3083 -4:00 - AST 1980 Apr 6
3084 -4:00 1:00 ADT 1980 Sep 28
3085 -4:00 - AST
3086
3087# Montserrat
3088# See 'southamerica'.
3089
3090# Nicaragua
3091#
3092# This uses Shanks & Pottenger for times before 2005.
3093#
3094# From Steffen Thorsen (2005-04-12):
3095# I've got reports from 8 different people that Nicaragua just started
3096# DST on Sunday 2005-04-10, in order to save energy because of
--- 57 unchanged lines hidden (view full) ---
3154
3155# Panama
3156# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3157Zone America/Panama -5:18:08 - LMT 1890
3158 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
3159 -5:00 - EST
3160
3161# Puerto Rico
3162# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3163# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3164Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3165 -4:00 - AST 1942 May 3
3166 -4:00 US A%sT 1946
3167 -4:00 - AST
3168
3169# St Kitts-Nevis
3170# St Lucia
3171# See 'southamerica'.
3172
3173# St Pierre and Miquelon
3174# There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3175# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3176Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3177 -4:00 - AST 1980 May
3178 -3:00 - PMST 1987 # Pierre & Miquelon Time
3179 -3:00 Canada PM%sT
3180
3181# St Vincent and the Grenadines
3182# See 'southamerica'.
3183
3184# Turks and Caicos
3185#
3186# From Chris Dunn in
3187# <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=415007>
3188# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the
3189# daylight saving dates for time changes have been adjusted to match
3190# the recent U.S. change of dates.
--- 13 unchanged lines hidden (view full) ---
3204# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
3205Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D
3206Rule TC 1979 2006 - Oct lastSun 2:00 0 S
3207Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
3208Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D
3209Rule TC 2007 max - Nov Sun>=1 2:00 0 S
3210# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3211Zone America/Grand_Turk -4:44:32 - LMT 1890
3212 -5:07:11 - KMT 1912 Feb # Kingston Mean Time
3213 -5:00 TC E%sT
3214
3215# British Virgin Is
3216# Virgin Is
3217# See 'southamerica'.