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 --- 6 unchanged lines hidden (view full) --- 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 --- 109 unchanged lines hidden (view full) --- 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"> --- 20 unchanged lines hidden (view full) --- 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] --- 247 unchanged lines hidden (view full) --- 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'. |