--- old/test/jdk/sun/util/calendar/zi/tzdata/northamerica 2019-07-25 11:28:10.000000000 -0700 +++ /dev/null 2019-07-25 11:28:10.000000000 -0700 @@ -1,3508 +0,0 @@ -# -# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. -# -# This code is free software; you can redistribute it and/or modify it -# under the terms of the GNU General Public License version 2 only, as -# published by the Free Software Foundation. -# -# This code is distributed in the hope that it will be useful, but WITHOUT -# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or -# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -# version 2 for more details (a copy is included in the LICENSE file that -# accompanied this code). -# -# You should have received a copy of the GNU General Public License version -# 2 along with this work; if not, write to the Free Software Foundation, -# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. -# -# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA -# or visit www.oracle.com if you need additional information or have any -# questions. -# -# tzdb data for North and Central America and environs - -# This file is in the public domain, so clarified as of -# 2009-05-17 by Arthur David Olson. - -# also includes Central America and the Caribbean - -# This file is by no means authoritative; if you think you know better, -# go ahead and edit the file (and please send any changes to -# tz@iana.org for general use in the future). For more, please see -# the file CONTRIBUTING in the tz distribution. - -# From Paul Eggert (1999-03-22): -# A reliable and entertaining source about time zones is -# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). - -############################################################################### - -# United States - -# From Paul Eggert (1999-03-31): -# Howse writes (pp 121-125) that time zones were invented by -# Professor Charles Ferdinand Dowd (1825-1904), -# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY). -# His pamphlet "A System of National Time for Railroads" (1870) -# was the result of his proposals at the Convention of Railroad Trunk Lines -# in New York City (1869-10). His 1870 proposal was based on Washington, DC, -# but in 1872-05 he moved the proposed origin to Greenwich. - -# From Paul Eggert (2018-03-20): -# Dowd's proposal left many details unresolved, such as where to draw -# lines between time zones. The key individual who made time zones -# work in the US was William Frederick Allen - railway engineer, -# managing editor of the Travelers' Guide, and secretary of the -# General Time Convention, a railway standardization group. Allen -# spent months in dialogs with scientific and railway leaders, -# developed a workable plan to institute time zones, and presented it -# to the General Time Convention on 1883-04-11, saying that his plan -# meant "local time would be practically abolished" - a plus for -# railway scheduling. By the next convention on 1883-10-11 nearly all -# railroads had agreed and it took effect on 1883-11-18. That Sunday -# was called the "day of two noons", as some locations observed noon -# twice. Allen witnessed the transition in New York City, writing: -# -# I heard the bells of St. Paul's strike on the old time. Four -# minutes later, obedient to the electrical signal from the Naval -# Observatory ... the time-ball made its rapid descent, the chimes -# of old Trinity rang twelve measured strokes, and local time was -# abandoned, probably forever. -# -# Most of the US soon followed suit. See: -# Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56. -# https://dx.doi.org/10.2307/3105430 - -# From Paul Eggert (2005-04-16): -# That 1883 transition occurred at 12:00 new time, not at 12:00 old time. -# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005). - -# From Paul Eggert (2006-03-22): -# A good source for time zone historical data in the US is -# Thomas G. Shanks, The American Atlas (5th edition), -# San Diego: ACS Publications, Inc. (1991). -# Make sure you have the errata sheet; the book is somewhat useless without it. -# It is the source for most of the pre-1991 US entries below. - -# From Paul Eggert (2001-03-06): -# Daylight Saving Time was first suggested as a joke by Benjamin Franklin -# in his whimsical essay "An Economical Project for Diminishing the Cost -# of Light" published in the Journal de Paris (1784-04-26). -# Not everyone is happy with the results: -# -# I don't really care how time is reckoned so long as there is some -# agreement about it, but I object to being told that I am saving -# daylight when my reason tells me that I am doing nothing of the kind. -# I even object to the implication that I am wasting something -# valuable if I stay in bed after the sun has risen. As an admirer -# of moonlight I resent the bossy insistence of those who want to -# reduce my time for enjoying it. At the back of the Daylight Saving -# scheme I detect the bony, blue-fingered hand of Puritanism, eager -# to push people into bed earlier, and get them up earlier, to make -# them healthy, wealthy and wise in spite of themselves. -# -# -- Robertson Davies, The diary of Samuel Marchbanks, -# Clarke, Irwin (1947), XIX, Sunday -# -# For more about the first ten years of DST in the United States, see -# Robert Garland, Ten years of daylight saving from the Pittsburgh standpoint -# (Carnegie Library of Pittsburgh, 1927). -# http://www.clpgh.org/exhibit/dst.html -# -# Shanks says that DST was called "War Time" in the US in 1918 and 1919. -# However, DST was imposed by the Standard Time Act of 1918, which -# was the first nationwide legal time standard, and apparently -# time was just called "Standard Time" or "Daylight Saving Time". - -# From Arthur David Olson: -# US Daylight Saving Time ended on the last Sunday of *October* in 1974. -# See, for example, the front page of the Saturday, 1974-10-26 -# and Sunday, 1974-10-27 editions of the Washington Post. - -# From Arthur David Olson: -# Before the Uniform Time Act of 1966 took effect in 1967, observance of -# Daylight Saving Time in the US was by local option, except during wartime. - -# From Arthur David Olson (2000-09-25): -# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama. -# In the introduction, Oboler spoke of "Eastern Peace Time." -# An AltaVista search turned up: -# https://web.archive.org/web/20000926032210/http://rowayton.org/rhs/hstaug45.html -# "When the time is announced over the radio now, it is 'Eastern Peace -# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful." -# (August 1945) by way of confirmation. -# -# From Paul Eggert (2017-09-23): -# This was the V-J Day issue of the Clamdigger, a Rowayton, CT newsletter. - -# From Joseph Gallant citing -# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987): -# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set -# to switch to London for Attlee's address, but the American people -# never got to hear his speech live. According to one press account, -# CBS' Bob Trout was first to announce the word of Japan's surrender, -# but a few seconds later, NBC, ABC and Mutual also flashed the word -# of surrender, all of whom interrupting the bells of Big Ben in -# London which were to precede Mr. Attlee's speech. - -# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From -# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times: -# -# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender. -# Any announcement from Asia would reach St. John's New York newsroom on a -# wire service teletype machine, which had prescribed signals for major news. -# Associated Press, for example, would ring five bells before spewing out -# typed copy of an important story, and 10 bells for news "of transcendental -# importance." -# -# On Aug. 14, stalling while talking steadily into the NBC networks' open -# microphone, St. John heard five bells and waited only to hear a sixth bell, -# before announcing confidently: "Ladies and gentlemen, World War II is over. -# The Japanese have agreed to our surrender terms." -# -# He had scored a 20-second scoop on other broadcasters. - -# From Arthur David Olson (2005-08-22): -# Paul has been careful to use the "US" rules only in those locations -# that are part of the United States; this reflects the real scope of -# U.S. government action. So even though the "US" rules have changed -# in the latest release, other countries won't be affected. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule US 1918 1919 - Mar lastSun 2:00 1:00 D -Rule US 1918 1919 - Oct lastSun 2:00 0 S -Rule US 1942 only - Feb 9 2:00 1:00 W # War -Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace -Rule US 1945 only - Sep lastSun 2:00 0 S -Rule US 1967 2006 - Oct lastSun 2:00 0 S -Rule US 1967 1973 - Apr lastSun 2:00 1:00 D -Rule US 1974 only - Jan 6 2:00 1:00 D -Rule US 1975 only - Feb 23 2:00 1:00 D -Rule US 1976 1986 - Apr lastSun 2:00 1:00 D -Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 D -Rule US 2007 max - Mar Sun>=8 2:00 1:00 D -Rule US 2007 max - Nov Sun>=1 2:00 0 S - -# From Arthur David Olson, 2005-12-19 -# We generate the files specified below to guard against old files with -# obsolete information being left in the time zone binary directory. -# We limit the list to names that have appeared in previous versions of -# this time zone package. -# We do these as separate Zones rather than as Links to avoid problems if -# a particular place changes whether it observes DST. -# We put these specifications here in the northamerica file both to -# increase the chances that they'll actually get compiled and to -# avoid the need to duplicate the US rules in another file. - -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone EST -5:00 - EST -Zone MST -7:00 - MST -Zone HST -10:00 - HST -Zone EST5EDT -5:00 US E%sT -Zone CST6CDT -6:00 US C%sT -Zone MST7MDT -7:00 US M%sT -Zone PST8PDT -8:00 US P%sT - -# From U. S. Naval Observatory (1989-01-19): -# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON -# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30 -# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON -# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30 -# USA MOUNTAIN 7 H BEHIND UTC DENVER -# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30 -# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO -# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30 -# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST) -# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT) -# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W -# USA " 9 H BEHIND UTC APR 3 - OCT 30 -# USA HAWAII 10 H BEHIND UTC -# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY - -# From Arthur David Olson (1989-01-21): -# The above dates are for 1988. -# Note the "AKST" and "AKDT" abbreviations, the claim that there's -# no DST in Samoa, and the claim that there is DST in Alaska and the -# Aleutians. - -# From Arthur David Olson (1988-02-13): -# Legal standard time zone names, from United States Code (1982 Edition and -# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names -# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966 -# took effect), as explained in sections 263 and 261: -# (none) -# United States standard eastern time -# United States standard mountain time -# United States standard central time -# United States standard Pacific time -# (none) -# United States standard Alaska time -# (none) -# Next, names from 1967-04-01 until 1983-11-30 (the date for -# public law 98-181): -# Atlantic standard time -# eastern standard time -# central standard time -# mountain standard time -# Pacific standard time -# Yukon standard time -# Alaska-Hawaii standard time -# Bering standard time -# And after 1983-11-30: -# Atlantic standard time -# eastern standard time -# central standard time -# mountain standard time -# Pacific standard time -# Alaska standard time -# Hawaii-Aleutian standard time -# Samoa standard time -# The law doesn't give abbreviations. -# -# From Paul Eggert (2016-12-19): -# Here are URLs for the 1918 and 1966 legislation: -# http://uscode.house.gov/statviewer.htm?volume=40&page=451 -# http://uscode.house.gov/statviewer.htm?volume=80&page=108 -# Although the 1918 names were officially "United States Standard -# Eastern Time" and similarly for "Central", "Mountain", "Pacific", -# and "Alaska", in practice "Standard" was placed just before "Time", -# as codified in 1966. In practice, Alaska time was abbreviated "AST" -# before 1968. Summarizing the 1967 name changes: -# 1918 names 1967 names -# -08 Standard Pacific Time (PST) Pacific standard time (PST) -# -09 (unofficial) Yukon (YST) Yukon standard time (YST) -# -10 Standard Alaska Time (AST) Alaska-Hawaii standard time (AHST) -# -11 (unofficial) Nome (NST) Bering standard time (BST) -# -# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow: -# Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time" -# for time in Guam and the Northern Marianas. See the file "australasia". -# -# From Paul Eggert (2015-04-17): -# HST and HDT are standardized abbreviations for Hawaii-Aleutian -# standard and daylight times. See section 9.47 (p 234) of the -# U.S. Government Printing Office Style Manual (2008) -# https://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf - -# From Arthur David Olson, 2005-08-09 -# The following was signed into law on 2005-08-08. -# -# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS. -# (a) Amendment.--Section 3(a) of the Uniform Time Act of 1966 (15 -# U.S.C. 260a(a)) is amended-- -# (1) by striking "first Sunday of April" and inserting "second -# Sunday of March"; and -# (2) by striking "last Sunday of October" and inserting "first -# Sunday of November'. -# (b) Effective Date.--Subsection (a) shall take effect 1 year after the -# date of enactment of this Act or March 1, 2007, whichever is later. -# (c) Report to Congress.--Not later than 9 months after the effective -# date stated in subsection (b), the Secretary shall report to Congress -# on the impact of this section on energy consumption in the United -# States. -# (d) Right to Revert.--Congress retains the right to revert the -# Daylight Saving Time back to the 2005 time schedules once the -# Department study is complete. - -# US eastern time, represented by New York - -# Connecticut, Delaware, District of Columbia, most of Florida, -# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky -# (except America/Kentucky/Louisville below), Maine, Maryland, Massachusetts, -# New Hampshire, New Jersey, New York, North Carolina, Ohio, -# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, -# Vermont, Virginia, West Virginia - -# From Dave Cantor (2004-11-02): -# Early this summer I had the occasion to visit the Mount Washington -# Observatory weather station atop (of course!) Mount Washington [, NH].... -# One of the staff members said that the station was on Eastern Standard Time -# and didn't change their clocks for Daylight Saving ... so that their -# reports will always have times which are 5 hours behind UTC. - -# From Paul Eggert (2005-08-26): -# According to today's Huntsville Times -# http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1125047783228320.xml&coll=1 -# a few towns on Alabama's "eastern border with Georgia, such as Phenix City -# in Russell County, Lanett in Chambers County and some towns in Lee County, -# set their watches and clocks on Eastern time." It quotes H.H. "Bubba" -# Roberts, city administrator in Phenix City. as saying "We are in the Central -# time zone, but we do go by the Eastern time zone because so many people work -# in Columbus." -# -# From Paul Eggert (2017-02-22): -# Four cities are involved. The two not mentioned above are Smiths Station -# and Valley. Barbara Brooks, Valley's assistant treasurer, heard it started -# because West Point Pepperell textile mills were in Alabama while the -# corporate office was in Georgia, and residents voted to keep Eastern -# time even after the mills closed. See: Kazek K. Did you know which -# Alabama towns are in a different time zone? al.com 2017-02-06. -# http://www.al.com/living/index.ssf/2017/02/do_you_know_which_alabama_town.html - -# From Paul Eggert (2014-09-06): -# Monthly Notices of the Royal Astronomical Society 44, 4 (1884-02-08), 208 -# says that New York City Hall time was 3 minutes 58.4 seconds fast of -# Eastern time (i.e., -4:56:01.6) just before the 1883 switch. Round to the -# nearest second. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule NYC 1920 only - Mar lastSun 2:00 1:00 D -Rule NYC 1920 only - Oct lastSun 2:00 0 S -Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D -Rule NYC 1921 1954 - Sep lastSun 2:00 0 S -Rule NYC 1955 1966 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 - -5:00 US E%sT 1920 - -5:00 NYC E%sT 1942 - -5:00 US E%sT 1946 - -5:00 NYC E%sT 1967 - -5:00 US E%sT - -# US central time, represented by Chicago - -# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia, -# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and -# Washington counties), Illinois, western Indiana -# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, -# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western -# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern -# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, -# western Tennessee, most of Texas, Wisconsin - -# From Paul Eggert (2018-01-07): -# In 1869 the Chicago Astronomical Society contracted with the city to keep -# time. Though delayed by the Great Fire, by 1880 a wire ran from the -# Dearborn Observatory (on the University of Chicago campus) to City Hall, -# which then sent signals to police and fire stations. However, railroads got -# their time signals from the Allegheny Observatory, the Madison Observatory, -# the Ann Arbor Observatory, etc., so their clocks did not agree with each -# other or with the city's official time. The confusion took some years to -# clear up. See: -# Moser M. How Chicago gave America its time zones. Chicago. 2018-01-04. -# http://www.chicagomag.com/city-life/January-2018/How-Chicago-Gave-America-Its-Time-Zones/ - -# From Larry M. Smith (2006-04-26) re Wisconsin: -# https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf -# is currently enforced at the 01:00 time of change. Because the local -# "bar time" in the state corresponds to 02:00, a number of citations -# are issued for the "sale of class 'B' alcohol after prohibited -# hours" within the deviated hour of this change every year.... -# -# From Douglas R. Bomberg (2007-03-12): -# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI -# Statue 175 closer in synch with the US Congress' intent.... -# https://docs.legis.wisconsin.gov/2007/related/acts/3 - -# From an email administrator of the City of Fort Pierre, SD (2015-12-21): -# Fort Pierre is technically located in the Mountain time zone as is -# the rest of Stanley County. Most of Stanley County and Fort Pierre -# uses the Central time zone due to doing most of their business in -# Pierre so it simplifies schedules. I have lived in Stanley County -# all my life and it has been that way since I can remember. (43 years!) -# -# From Paul Eggert (2015-12-25): -# Assume this practice predates 1970, so Fort Pierre can use America/Chicago. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Chicago 1920 only - Jun 13 2:00 1:00 D -Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S -Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D -Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D -Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S -Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:09:24 - -6:00 US C%sT 1920 - -6:00 Chicago C%sT 1936 Mar 1 2:00 - -5:00 - EST 1936 Nov 15 2:00 - -6:00 Chicago C%sT 1942 - -6:00 US C%sT 1946 - -6:00 Chicago C%sT 1967 - -6:00 US C%sT -# Oliver County, ND switched from mountain to central time on 1992-10-25. -Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 - -7:00 US M%sT 1992 Oct 25 2:00 - -6:00 US C%sT -# Morton County, ND, switched from mountain to central time on -# 2003-10-26, except for the area around Mandan which was already central time. -# See . -# Officially this switch also included part of Sioux County, and -# Jones, Mellette, and Todd Counties in South Dakota; -# but in practice these other counties were already observing central time. -# See . -Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21 - -7:00 US M%sT 2003 Oct 26 2:00 - -6:00 US C%sT - -# From Josh Findley (2011-01-21): -# ...it appears that Mercer County, North Dakota, changed from the -# mountain time zone to the central time zone at the last transition from -# daylight-saving to standard time (on Nov. 7, 2010): -# https://www.gpo.gov/fdsys/pkg/FR-2010-09-29/html/2010-24376.htm -# http://www.bismarcktribune.com/news/local/article_1eb1b588-c758-11df-b472-001cc4c03286.html - -# From Andy Lipscomb (2011-01-24): -# ...according to the Census Bureau, the largest city is Beulah (although -# it's commonly referred to as Beulah-Hazen, with Hazen being the next -# largest city in Mercer County). Google Maps places Beulah's city hall -# at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07". - -Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53 - -7:00 US M%sT 2010 Nov 7 2:00 - -6:00 US C%sT - -# US mountain time, represented by Denver -# -# Colorado, far western Kansas, Montana, western -# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City), -# New Mexico, southwestern North Dakota, -# western South Dakota, far western Texas (El Paso County, Hudspeth County, -# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming -# -# From Paul Eggert (2018-10-25): -# On 1921-03-04 federal law placed all of Texas into the central time zone. -# However, El Paso ignored the law for decades and continued to observe -# mountain time, on the grounds that that's what they had always done -# and they weren't about to let the federal government tell them what to do. -# Eventually the federal government gave in and changed the law on -# 1970-04-10 to match what El Paso was actually doing. Although -# that's slightly after our 1970 cutoff, there is no need to create a -# separate zone for El Paso since they were ignoring the law anyway. See: -# Long T. El Pasoans were time rebels, fought to stay in Mountain zone. -# El Paso Times. 2018-10-24 06:40 -06. -# https://www.elpasotimes.com/story/news/local/el-paso/2018/10/24/el-pasoans-were-time-rebels-fought-stay-mountain-zone/1744509002/ -# -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D -Rule Denver 1920 only - Oct lastSun 2:00 0 S -Rule Denver 1921 only - May 22 2:00 0 S -Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D -Rule Denver 1965 1966 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 - -7:00 US M%sT 1920 - -7:00 Denver M%sT 1942 - -7:00 US M%sT 1946 - -7:00 Denver M%sT 1967 - -7:00 US M%sT - -# US Pacific time, represented by Los Angeles -# -# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater, -# Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county -# north of the Salmon River, and the towns of Burgdorf and Warren), -# Nevada (except West Wendover), Oregon (except the northern ¾ of -# Malheur county), and Washington - -# From Paul Eggert (2016-08-20): -# In early February 1948, in response to California's electricity shortage, -# PG&E changed power frequency from 60 to 59.5 Hz during daylight hours, -# causing electric clocks to lose six minutes per day. (This did not change -# legal time, and is not part of the data here.) See: -# Ross SA. An energy crisis from the past: Northern California in 1948. -# Working Paper No. 8, Institute of Governmental Studies, UC Berkeley, -# 1973-11. https://escholarship.org/uc/item/8x22k30c -# -# In another measure to save electricity, DST was instituted from 1948-03-14 -# at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move -# the fallback transition earlier. See pages 3-4 of: -# http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Statutes/1948/48Vol1_Chapters.pdf -# -# In response: -# -# Governor Warren received a torrent of objecting mail, and it is not too much -# to speculate that the objections to Daylight Saving Time were one important -# factor in the defeat of the Dewey-Warren Presidential ticket in California. -# -- Ross, p 25 -# -# On December 8 the governor exercised the option, setting the date to January 1 -# (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01). -# -# Despite the controversy, in 1949 California voters approved Proposition 12, -# which established DST from April's last Sunday at 01:00 until September's -# last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed -# the fall-back date to October's last Sunday. See: -# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=ca_ballot_props -# https://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=ca_ballot_props -# -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule CA 1948 only - Mar 14 2:01 1:00 D -Rule CA 1949 only - Jan 1 2:00 0 S -Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D -Rule CA 1950 1961 - Sep lastSun 2:00 0 S -Rule CA 1962 1966 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 - -8:00 US P%sT 1946 - -8:00 CA P%sT 1967 - -8:00 US P%sT - -# Alaska -# AK%sT is the modern abbreviation for -09 per USNO. -# -# From Paul Eggert (2017-06-15): -# Howse writes that Alaska switched from the Julian to the Gregorian calendar, -# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia. -# On Friday, 1867-10-18 (Gregorian), at precisely 15:30 local time, the -# Russian forts and fleet at Sitka fired salutes to mark the ceremony of -# formal transfer. See the Sacramento Daily Union (1867-11-14), p 3, col 2. -# https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SDU18671114.2.12.1 -# Sitka workers did not change their calendars until Sunday, 1867-10-20, -# and so celebrated two Sundays that week. See: Ahllund T (tr Hallamaa P). -# From the memoirs of a Finnish workman. Alaska History. 2006 Fall;21(2):1-25. -# http://alaskahistoricalsociety.org/wp-content/uploads/2016/12/Ahllund-2006-Memoirs-of-a-Finnish-Workman.pdf -# Include only the time zone part of this transition, ignoring the switch -# from Julian to Gregorian, since we can't represent the Julian calendar. -# -# As far as we know, of the locations mentioned below only Sitka was -# permanently inhabited in 1867 by anyone using either calendar. -# (Yakutat was colonized by the Russians in 1799, but the settlement was -# destroyed in 1805 by a Yakutat-kon war party.) Many of Alaska's inhabitants -# were unaware of the US acquisition of Alaska, much less of any calendar or -# time change. However, the Russian-influenced part of Alaska did observe -# Russian time, and it is more accurate to model this than to ignore it. -# The database format requires an exact transition time; use the Russian -# salute as a somewhat-arbitrary time for the formal transfer of control for -# all of Alaska. Sitka's UTC offset is -9:01:13; adjust its 15:30 to the -# local times of other Alaskan locations so that they change simultaneously. - -# From Paul Eggert (2014-07-18): -# One opinion of the early-1980s turmoil in Alaska over time zones and -# daylight saving time appeared as graffiti on a Juneau airport wall: -# "Welcome to Juneau. Please turn your watch back to the 19th century." -# See: Turner W. Alaska's four time zones now two. NY Times 1983-11-01. -# http://www.nytimes.com/1983/11/01/us/alaska-s-four-time-zones-now-two.html -# -# Steve Ferguson (2011-01-31) referred to the following source: -# Norris F. Keeping time in Alaska: national directives, local response. -# Alaska History 2001;16(1-2). -# http://alaskahistoricalsociety.org/discover-alaska/glimpses-of-the-past/keeping-time-in-alaska/ - -# From Arthur David Olson (2011-02-01): -# Here's database-relevant material from the 2001 "Alaska History" article: -# -# On September 20 [1979]...DOT...officials decreed that on April 27, -# 1980, Juneau and other nearby communities would move to Yukon Time. -# Sitka, Petersburg, Wrangell, and Ketchikan, however, would remain on -# Pacific Time. -# -# ...on September 22, 1980, DOT Secretary Neil E. Goldschmidt rescinded the -# Department's September 1979 decision. Juneau and other communities in -# northern Southeast reverted to Pacific Time on October 26. -# -# On October 28 [1983]...the Metlakatla Indian Community Council voted -# unanimously to keep the reservation on Pacific Time. -# -# According to DOT official Joanne Petrie, Indian reservations are not -# bound to follow time zones imposed by neighboring jurisdictions. -# -# (The last is consistent with how the database now handles the Navajo -# Nation.) - -# From Arthur David Olson (2011-02-09): -# I just spoke by phone with a staff member at the Metlakatla Indian -# Community office (using contact information available at -# http://www.commerce.state.ak.us/dca/commdb/CIS.cfm?Comm_Boro_name=Metlakatla -# It's shortly after 1:00 here on the east coast of the United States; -# the staffer said it was shortly after 10:00 there. When I asked whether -# that meant they were on Pacific time, they said no - they were on their -# own time. I asked about daylight saving; they said it wasn't used. I -# did not inquire about practices in the past. - -# From Arthur David Olson (2011-08-17): -# For lack of better information, assume that Metlakatla's -# abandonment of use of daylight saving resulted from the 1983 vote. - -# From Steffen Thorsen (2015-11-09): -# It seems Metlakatla did go off PST on Sunday, November 1, changing -# their time to AKST and are going to follow Alaska's DST, switching -# between AKST and AKDT from now on.... -# https://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/ - -# From Ryan Stanley (2018-11-06): -# The Metlakatla community in Alaska has decided not to change its -# clock back an hour starting on November 4th, 2018 (day before yesterday). -# They will be gmtoff=-28800 year-round. -# https://www.facebook.com/141055983004923/photos/pb.141055983004923.-2207520000.1541465673./569081370202380/ - -# From Paul Eggert (2018-12-16): -# In a 2018-12-11 special election, Metlakatla voted to go back to -# Alaska time (including daylight saving time) starting next year. -# https://www.krbd.org/2018/12/12/metlakatla-to-follow-alaska-standard-time-allow-liquor-sales/ -# -# From Ryan Stanley (2019-01-11): -# The community will be changing back on the 20th of this month... -# From Tim Parenti (2019-01-11): -# Per an announcement on the Metlakatla community's official Facebook page, the -# "fall back" will be on Sunday 2019-01-20 at 02:00: -# https://www.facebook.com/141055983004923/photos/607150969728753/ -# So they won't be waiting for Alaska to join them on 2019-03-10, but will -# rather change their clocks twice in seven weeks. - -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Juneau 15:02:19 - LMT 1867 Oct 19 15:33:32 - -8:57:41 - LMT 1900 Aug 20 12:00 - -8:00 - PST 1942 - -8:00 US P%sT 1946 - -8:00 - PST 1969 - -8:00 US P%sT 1980 Apr 27 2:00 - -9:00 US Y%sT 1980 Oct 26 2:00 - -8:00 US P%sT 1983 Oct 30 2:00 - -9:00 US Y%sT 1983 Nov 30 - -9:00 US AK%sT -Zone America/Sitka 14:58:47 - LMT 1867 Oct 19 15:30 - -9:01:13 - LMT 1900 Aug 20 12:00 - -8:00 - PST 1942 - -8:00 US P%sT 1946 - -8:00 - PST 1969 - -8:00 US P%sT 1983 Oct 30 2:00 - -9:00 US Y%sT 1983 Nov 30 - -9:00 US AK%sT -Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 19 15:44:55 - -8:46:18 - LMT 1900 Aug 20 12:00 - -8:00 - PST 1942 - -8:00 US P%sT 1946 - -8:00 - PST 1969 - -8:00 US P%sT 1983 Oct 30 2:00 - -8:00 - PST 2015 Nov 1 2:00 - -9:00 US AK%sT 2018 Nov 4 2:00 - -8:00 - PST 2019 Jan 20 2:00 - -9:00 US AK%sT -Zone America/Yakutat 14:41:05 - LMT 1867 Oct 19 15:12:18 - -9:18:55 - LMT 1900 Aug 20 12:00 - -9:00 - YST 1942 - -9:00 US Y%sT 1946 - -9:00 - YST 1969 - -9:00 US Y%sT 1983 Nov 30 - -9:00 US AK%sT -Zone America/Anchorage 14:00:24 - LMT 1867 Oct 19 14:31:37 - -9:59:36 - LMT 1900 Aug 20 12:00 - -10:00 - AST 1942 - -10:00 US A%sT 1967 Apr - -10:00 - AHST 1969 - -10:00 US AH%sT 1983 Oct 30 2:00 - -9:00 US Y%sT 1983 Nov 30 - -9:00 US AK%sT -Zone America/Nome 12:58:22 - LMT 1867 Oct 19 13:29:35 - -11:01:38 - LMT 1900 Aug 20 12:00 - -11:00 - NST 1942 - -11:00 US N%sT 1946 - -11:00 - NST 1967 Apr - -11:00 - BST 1969 - -11:00 US B%sT 1983 Oct 30 2:00 - -9:00 US Y%sT 1983 Nov 30 - -9:00 US AK%sT -Zone America/Adak 12:13:22 - LMT 1867 Oct 19 12:44:35 - -11:46:38 - LMT 1900 Aug 20 12:00 - -11:00 - NST 1942 - -11:00 US N%sT 1946 - -11:00 - NST 1967 Apr - -11:00 - BST 1969 - -11:00 US B%sT 1983 Oct 30 2:00 - -10:00 US AH%sT 1983 Nov 30 - -10:00 US H%sT -# The following switches don't quite make our 1970 cutoff. -# -# Shanks writes that part of southwest Alaska (e.g. Aniak) -# switched from -11:00 to -10:00 on 1968-09-22 at 02:00, -# and another part (e.g. Akiak) made the same switch five weeks later. -# -# From David Flater (2004-11-09): -# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska -# Historic Preservation Commission, provided this information, which -# suggests that Unalaska deviated from statutory time from early 1967 -# possibly until 1983: -# -# Minutes of the Unalaska City Council Meeting, January 10, 1967: -# "Except for St. Paul and Akutan, Unalaska is the only important -# location not on Alaska Standard Time. The following resolution was -# made by William Robinson and seconded by Henry Swanson: Be it -# resolved that the City of Unalaska hereby goes to Alaska Standard -# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, -# January 14, Alaska Standard Time.) This resolution was passed with -# three votes for and one against." - -# Hawaii - -# From Arthur David Olson (2010-12-09): -# "Hawaiian Time" by Robert C. Schmitt and Doak C. Cox appears on pages 207-225 -# of volume 26 of The Hawaiian Journal of History (1992). As of 2010-12-09, -# the article is available at -# https://evols.library.manoa.hawaii.edu/bitstream/10524/239/2/JL26215.pdf -# and indicates that standard time was adopted effective noon, January -# 13, 1896 (page 218), that in "1933, the Legislature decreed daylight -# saving for the period between the last Sunday of each April and the -# last Sunday of each September, but less than a month later repealed the -# act," (page 220), that year-round daylight saving time was in effect -# from 1942-02-09 to 1945-09-30 (page 221, with no time of day given for -# when clocks changed) and that clocks were changed by 30 minutes -# effective the second Sunday of June, 1947 (page 219, with no time of -# day given for when clocks changed). A footnote for the 1933 changes -# cites Session Laws of Hawaii 1933, "Act. 90 (approved 26 Apr. 1933) -# and Act 163 (approved 21 May 1933)." - -# From Arthur David Olson (2011-01-19): -# The following is from "Laws of the Territory of Hawaii Passed by the -# Seventeenth Legislature: Regular Session 1933," available (as of -# 2011-01-19) at American University's Pence Law Library. Page 85: "Act -# 90...At 2 o'clock ante meridian of the last Sunday in April of each -# year, the standard time of this Territory shall be advanced one -# hour...This Act shall take effect upon its approval. Approved this 26th -# day of April, A. D. 1933. LAWRENCE M JUDD, Governor of the Territory of -# Hawaii." Page 172: "Act 163...Act 90 of the Session Laws of 1933 is -# hereby repealed...This Act shall take effect upon its approval, upon -# which date the standard time of this Territory shall be restored to -# that existing immediately prior to the taking effect of said Act 90. -# Approved this 21st day of May, A. D. 1933. LAWRENCE M. JUDD, Governor -# of the Territory of Hawaii." -# -# Note that 1933-05-21 was a Sunday. -# We're left to guess the time of day when Act 163 was approved; guess noon. - -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Pacific/Honolulu -10:31:26 - LMT 1896 Jan 13 12:00 - -10:30 - HST 1933 Apr 30 2:00 - -10:30 1:00 HDT 1933 May 21 12:00 - -10:30 US H%sT 1947 Jun 8 2:00 - -10:00 - HST - -# Now we turn to US areas that have diverged from the consensus since 1970. - -# Arizona mostly uses MST. - -# From Paul Eggert (2002-10-20): -# -# The information in the rest of this paragraph is derived from the -# Daylight Saving Time web page -# (2002-01-23) -# maintained by the Arizona State Library, Archives and Public Records. -# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard -# time, but by federal law railroads, airlines, bus lines, military -# personnel, and some engaged in interstate commerce continued to -# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix -# Gazette says that was the date the law changed, and that 04-01 was -# the date the state's clocks would change. In 1945 the State of -# Arizona used standard time all year, again with exceptions only as -# mandated by federal law. Arizona observed DST in 1967, but Arizona -# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST. -# -# Shanks says the 1944 experiment came to an end on 1944-03-17. -# Go with the Arizona State Library instead. - -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 - -7:00 US M%sT 1944 Jan 1 0:01 - -7:00 - MST 1944 Apr 1 0:01 - -7:00 US M%sT 1944 Oct 1 0:01 - -7:00 - MST 1967 - -7:00 US M%sT 1968 Mar 21 - -7:00 - MST -# From Arthur David Olson (1988-02-13): -# A writer from the Inter Tribal Council of Arizona, Inc., -# notes in private correspondence dated 1987-12-28 that "Presently, only the -# Navajo Nation participates in the Daylight Saving Time policy, due to its -# large size and location in three states." (The "only" means that other -# tribal nations don't use DST.) -# -# From Paul Eggert (2013-08-26): -# See America/Denver for a zone appropriate for the Navajo Nation. - -# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine, -# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark, -# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome, -# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power, -# Teton, Twin Falls, Valley, Washington counties, and the southern -# quarter of Idaho county) and eastern Oregon (most of Malheur County) -# switched four weeks late in 1974. -# -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 - -8:00 US P%sT 1923 May 13 2:00 - -7:00 US M%sT 1974 - -7:00 - MST 1974 Feb 3 2:00 - -7:00 US M%sT - -# Indiana -# -# For a map of Indiana's time zone regions, see: -# https://en.wikipedia.org/wiki/Time_in_Indiana -# -# From Paul Eggert (2018-11-30): -# A brief but entertaining history of time in Indiana describes a 1949 debate -# in the Indiana House where city legislators (who favored "fast time") -# tussled with farm legislators (who didn't) over a bill to outlaw DST: -# "Lacking enough votes, the city faction tries to filibuster until time runs -# out on the session at midnight, but rural champion Rep. Herbert Copeland, -# R-Madison, leans over the gallery railing and forces the official clock -# back to 9 p.m., breaking it in the process. The clock sticks on 9 as the -# debate rages on into the night. The filibuster finally dies out and the -# bill passes, while outside the chamber, clocks read 3:30 a.m. In the end, -# it doesn't matter which side won. The law has no enforcement powers and -# is simply ignored by fast-time communities." -# How Indiana went from 'God's time' to split zones and daylight-saving. -# Indianapolis Star. 2018-11-27 14:58 -05. -# https://www.indystar.com/story/news/politics/2018/11/27/indianapolis-indiana-time-zone-history-central-eastern-daylight-savings-time/2126300002/ -# -# From Paul Eggert (2007-08-17): -# Since 1970, most of Indiana has been like America/Indiana/Indianapolis, -# with the following exceptions: -# -# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer, -# Vanderburgh, and Warrick counties have been like America/Chicago. -# -# - Dearborn and Ohio counties have been like America/New_York. -# -# - Clark, Floyd, and Harrison counties have been like -# America/Kentucky/Louisville. -# -# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke, -# and Switzerland counties have their own time zone histories as noted below. -# -# Shanks partitioned Indiana into 345 regions, each with its own time history, -# and wrote "Even newspaper reports present contradictory information." -# Those Hoosiers! Such a flighty and changeable people! -# Fortunately, most of the complexity occurred before our cutoff date of 1970. -# -# Other than Indianapolis, the Indiana place names are so nondescript -# that they would be ambiguous if we left them at the 'America' level. -# So we reluctantly put them all in a subdirectory 'America/Indiana'. - -# From Paul Eggert (2014-06-26): -# https://www.federalregister.gov/articles/2006/01/20/06-563/standard-time-zone-boundary-in-the-state-of-indiana -# says "DOT is relocating the time zone boundary in Indiana to move Starke, -# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the -# Eastern Time Zone to the Central Time Zone.... The effective date of -# this rule is 2 a.m. EST Sunday, April 2, 2006, which is the -# changeover date from standard time to Daylight Saving Time." -# Strictly speaking, this meant the affected counties changed their -# clocks twice that night, but this obviously was in error. The intent -# was that 01:59:59 EST be followed by 02:00:00 CDT. - -# From Gwillim Law (2007-02-10): -# The Associated Press has been reporting that Pulaski County, Indiana is -# going to switch from Central to Eastern Time on March 11, 2007.... -# http://www.indystar.com/apps/pbcs.dll/article?AID=/20070207/LOCAL190108/702070524/0/LOCAL - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D -Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S -Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 - -6:00 US C%sT 1920 - -6:00 Indianapolis C%sT 1942 - -6:00 US C%sT 1946 - -6:00 Indianapolis C%sT 1955 Apr 24 2:00 - -5:00 - EST 1957 Sep 29 2:00 - -6:00 - CST 1958 Apr 27 2:00 - -5:00 - EST 1969 - -5:00 US E%sT 1971 - -5:00 - EST 2006 - -5:00 US E%sT -# -# Eastern Crawford County, Indiana, left its clocks alone in 1974, -# as well as from 1976 through 2005. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D -Rule Marengo 1951 only - Sep lastSun 2:00 0 S -Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D -Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 - -6:00 US C%sT 1951 - -6:00 Marengo C%sT 1961 Apr 30 2:00 - -5:00 - EST 1969 - -5:00 US E%sT 1974 Jan 6 2:00 - -6:00 1:00 CDT 1974 Oct 27 2:00 - -5:00 US E%sT 1976 - -5:00 - EST 2006 - -5:00 US E%sT -# -# Daviess, Dubois, Knox, and Martin Counties, Indiana, -# switched from eastern to central time in April 2006, then switched back -# in November 2007. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D -Rule Vincennes 1946 only - Sep lastSun 2:00 0 S -Rule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D -Rule Vincennes 1953 1959 - Sep lastSun 2:00 0 S -Rule Vincennes 1955 only - May 1 0:00 1:00 D -Rule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D -Rule Vincennes 1960 only - Oct lastSun 2:00 0 S -Rule Vincennes 1961 only - Sep lastSun 2:00 0 S -Rule Vincennes 1962 1963 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Indiana/Vincennes -5:50:07 - LMT 1883 Nov 18 12:09:53 - -6:00 US C%sT 1946 - -6:00 Vincennes C%sT 1964 Apr 26 2:00 - -5:00 - EST 1969 - -5:00 US E%sT 1971 - -5:00 - EST 2006 Apr 2 2:00 - -6:00 US C%sT 2007 Nov 4 2:00 - -5:00 US E%sT -# -# Perry County, Indiana, switched from eastern to central time in April 2006. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Perry 1946 only - Apr lastSun 2:00 1:00 D -Rule Perry 1946 only - Sep lastSun 2:00 0 S -Rule Perry 1953 1954 - Apr lastSun 2:00 1:00 D -Rule Perry 1953 1959 - Sep lastSun 2:00 0 S -Rule Perry 1955 only - May 1 0:00 1:00 D -Rule Perry 1956 1963 - Apr lastSun 2:00 1:00 D -Rule Perry 1960 only - Oct lastSun 2:00 0 S -Rule Perry 1961 only - Sep lastSun 2:00 0 S -Rule Perry 1962 1963 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57 - -6:00 US C%sT 1946 - -6:00 Perry C%sT 1964 Apr 26 2:00 - -5:00 - EST 1969 - -5:00 US E%sT 1971 - -5:00 - EST 2006 Apr 2 2:00 - -6:00 US C%sT -# -# Pike County, Indiana moved from central to eastern time in 1977, -# then switched back in 2006, then switched back again in 2007. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Pike 1955 only - May 1 0:00 1:00 D -Rule Pike 1955 1960 - Sep lastSun 2:00 0 S -Rule Pike 1956 1964 - Apr lastSun 2:00 1:00 D -Rule Pike 1961 1964 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Indiana/Petersburg -5:49:07 - LMT 1883 Nov 18 12:10:53 - -6:00 US C%sT 1955 - -6:00 Pike C%sT 1965 Apr 25 2:00 - -5:00 - EST 1966 Oct 30 2:00 - -6:00 US C%sT 1977 Oct 30 2:00 - -5:00 - EST 2006 Apr 2 2:00 - -6:00 US C%sT 2007 Nov 4 2:00 - -5:00 US E%sT -# -# Starke County, Indiana moved from central to eastern time in 1991, -# then switched back in 2006. -# From Arthur David Olson (1991-10-28): -# An article on page A3 of the Sunday, 1991-10-27 Washington Post -# notes that Starke County switched from Central time to Eastern time as of -# 1991-10-27. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D -Rule Starke 1947 1954 - Sep lastSun 2:00 0 S -Rule Starke 1955 1956 - Oct lastSun 2:00 0 S -Rule Starke 1957 1958 - Sep lastSun 2:00 0 S -Rule Starke 1959 1961 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 - -6:00 US C%sT 1947 - -6:00 Starke C%sT 1962 Apr 29 2:00 - -5:00 - EST 1963 Oct 27 2:00 - -6:00 US C%sT 1991 Oct 27 2:00 - -5:00 - EST 2006 Apr 2 2:00 - -6:00 US C%sT -# -# Pulaski County, Indiana, switched from eastern to central time in -# April 2006 and then switched back in March 2007. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D -Rule Pulaski 1946 1954 - Sep lastSun 2:00 0 S -Rule Pulaski 1955 1956 - Oct lastSun 2:00 0 S -Rule Pulaski 1957 1960 - Sep lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Indiana/Winamac -5:46:25 - LMT 1883 Nov 18 12:13:35 - -6:00 US C%sT 1946 - -6:00 Pulaski C%sT 1961 Apr 30 2:00 - -5:00 - EST 1969 - -5:00 US E%sT 1971 - -5:00 - EST 2006 Apr 2 2:00 - -6:00 US C%sT 2007 Mar 11 2:00 - -5:00 US E%sT -# -# Switzerland County, Indiana, did not observe DST from 1973 through 2005. -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 - -6:00 US C%sT 1954 Apr 25 2:00 - -5:00 - EST 1969 - -5:00 US E%sT 1973 - -5:00 - EST 2006 - -5:00 US E%sT - -# From Paul Eggert (2018-03-20): -# The Louisville & Nashville Railroad's 1883-11-18 change occurred at -# 10:00 old local time; train were supposed to come to a standstill -# for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not -# clear how this matched civil time in Louisville, so for now continue -# to assume Louisville switched at noon new local time, like New York. -# -# Part of Kentucky left its clocks alone in 1974. -# This also includes Clark, Floyd, and Harrison counties in Indiana. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Louisville 1921 only - May 1 2:00 1:00 D -Rule Louisville 1921 only - Sep 1 2:00 0 S -Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D -Rule Louisville 1941 only - Sep lastSun 2:00 0 S -Rule Louisville 1946 only - Jun 2 2:00 0 S -Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S -Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 - -6:00 US C%sT 1921 - -6:00 Louisville C%sT 1942 - -6:00 US C%sT 1946 - -6:00 Louisville C%sT 1961 Jul 23 2:00 - -5:00 - EST 1968 - -5:00 US E%sT 1974 Jan 6 2:00 - -6:00 1:00 CDT 1974 Oct 27 2:00 - -5:00 US E%sT -# -# Wayne County, Kentucky -# -# From Lake Cumberland LIFE -# http://www.lake-cumberland.com/life/archive/news990129time.shtml -# (1999-01-29) via WKYM-101.7: -# Clinton County has joined Wayne County in asking the DoT to change from -# the Central to the Eastern time zone.... The Wayne County government made -# the same request in December. And while Russell County officials have not -# taken action, the majority of respondents to a poll conducted there in -# August indicated they would like to change to "fast time" also. -# The three Lake Cumberland counties are the farthest east of any U.S. -# location in the Central time zone. -# -# From Rich Wales (2000-08-29): -# After prolonged debate, and despite continuing deep differences of opinion, -# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern -# (-0500) time. They won't "fall back" this year. See Sara Shipley, -# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400). -# -# From Paul Eggert (2001-07-16): -# The final rule was published in the -# Federal Register 65, 160 (2000-08-17), pp 50154-50158. -# https://www.gpo.gov/fdsys/pkg/FR-2000-08-17/html/00-20854.htm -# -Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:20:36 - -6:00 US C%sT 1946 - -6:00 - CST 1968 - -6:00 US C%sT 2000 Oct 29 2:00 - -5:00 US E%sT - - -# From Rives McDow (2000-08-30): -# Here ... are all the changes in the US since 1985. -# Kearny County, KS (put all of county on central; -# previously split between MST and CST) ... 1990-10 -# Starke County, IN (from CST to EST) ... 1991-10 -# Oliver County, ND (from MST to CST) ... 1992-10 -# West Wendover, NV (from PST TO MST) ... 1999-10 -# Wayne County, KY (from CST to EST) ... 2000-10 -# -# From Paul Eggert (2001-07-17): -# We don't know where the line used to be within Kearny County, KS, -# so omit that change for now. -# See America/Indiana/Knox for the Starke County, IN change. -# See America/North_Dakota/Center for the Oliver County, ND change. -# West Wendover, NV officially switched from Pacific to mountain time on -# 1999-10-31. See the -# Federal Register 64, 203 (1999-10-21), pp 56705-56707. -# https://www.gpo.gov/fdsys/pkg/FR-1999-10-21/html/99-27240.htm -# However, the Federal Register says that West Wendover already operated -# on mountain time, and the rule merely made this official; -# hence a separate tz entry is not needed. - -# Michigan -# -# From Bob Devine (1988-01-28): -# Michigan didn't observe DST from 1968 to 1973. -# -# From Paul Eggert (1999-03-31): -# Shanks writes that Michigan started using standard time on 1885-09-18, -# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) -# that Detroit kept -# -# local time until 1900 when the City Council decreed that clocks should -# be put back twenty-eight minutes to Central Standard Time. Half the -# city obeyed, half refused. After considerable debate, the decision -# was rescinded and the city reverted to Sun time. A derisive offer to -# erect a sundial in front of the city hall was referred to the -# Committee on Sewers. Then, in 1905, Central time was adopted -# by city vote. -# -# This story is too entertaining to be false, so go with Howse over Shanks. -# -# From Paul Eggert (2001-03-06): -# Garland (1927) writes "Cleveland and Detroit advanced their clocks -# one hour in 1914." This change is not in Shanks. We have no more -# info, so omit this for now. -# -# From Paul Eggert (2017-07-26): -# Although Shanks says Detroit observed DST in 1967 from 06-14 00:01 -# until 10-29 00:01, I now see multiple reports that this is incorrect. -# For example, according to a 50-year anniversary report about the 1967 -# Detroit riots and a major-league doubleheader on 1967-07-23, "By the time -# the last fly ball of the doubleheader settled into the glove of leftfielder -# Lenny Green, it was after 7 p.m. Detroit did not observe daylight saving -# time, so light was already starting to fail. Twilight was made even deeper -# by billowing columns of smoke that ascended in an unbroken wall north of the -# ballpark." See: Dow B. Detroit '67: As violence unfolded, Tigers played two -# at home vs. Yankees. Detroit Free Press 2017-07-23. -# https://www.freep.com/story/sports/mlb/tigers/2017/07/23/detroit-tigers-1967-riot-new-york-yankees/499951001/ -# -# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D -Rule Detroit 1948 only - Sep lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Detroit -5:32:11 - LMT 1905 - -6:00 - CST 1915 May 15 2:00 - -5:00 - EST 1942 - -5:00 US E%sT 1946 - -5:00 Detroit E%sT 1973 - -5:00 US E%sT 1975 - -5:00 - EST 1975 Apr 27 2:00 - -5:00 US E%sT -# -# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan, -# switched from EST to CST/CDT in 1973. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER -Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D -Rule Menominee 1946 only - Sep lastSun 2:00 0 S -Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D -Rule Menominee 1966 only - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00 - -6:00 US C%sT 1946 - -6:00 Menominee C%sT 1969 Apr 27 2:00 - -5:00 - EST 1973 Apr 29 2:00 - -6:00 US C%sT - -# Navassa -# administered by the US Fish and Wildlife Service -# claimed by US under the provisions of the 1856 Guano Islands Act -# also claimed by Haiti -# occupied 1857/1900 by the Navassa Phosphate Co -# US lighthouse 1917/1996-09 -# currently uninhabited -# see Mark Fineman, "An Isle Rich in Guano and Discord", -# _Los Angeles Times_ (1998-11-10), A1, A10; it cites -# Jimmy Skaggs, _The Great Guano Rush_ (1994). - -################################################################################ - - -# From Paul Eggert (2017-02-10): -# -# Unless otherwise specified, the source for data through 1990 is: -# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), -# San Diego: ACS Publications, Inc. (2003). -# Unfortunately this book contains many errors and cites no sources. -# -# Many years ago Gwillim Law wrote that a good source -# for time zone data was the International Air Transport -# Association's Standard Schedules Information Manual (IATA SSIM), -# published semiannually. Law sent in several helpful summaries -# of the IATA's data after 1990. Except where otherwise noted, -# IATA SSIM is the source for entries after 1990. -# -# Other sources occasionally used include: -# -# Edward W. Whitman, World Time Differences, -# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), -# which I found in the UCLA library. -# -# William Willett, The Waste of Daylight, 19th edition -# -# [PDF] (1914-03) -# -# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94 -# . -# -# See the 'europe' file for Greenland. - -# Canada - -# From Alain LaBonté (1994-11-14): -# I post here the time zone abbreviations standardized in Canada -# for both English and French in the CAN/CSA-Z234.4-89 standard.... -# -# UTC Standard time Daylight saving time -# offset French English French English -# -2:30 - - HAT NDT -# -3 - - HAA ADT -# -3:30 HNT NST - - -# -4 HNA AST HAE EDT -# -5 HNE EST HAC CDT -# -6 HNC CST HAR MDT -# -7 HNR MST HAP PDT -# -8 HNP PST HAY YDT -# -9 HNY YST - - -# -# HN: Heure Normale ST: Standard Time -# HA: Heure Avancée DT: Daylight saving Time -# -# A: de l'Atlantique Atlantic -# C: du Centre Central -# E: de l'Est Eastern -# M: Mountain -# N: Newfoundland -# P: du Pacifique Pacific -# R: des Rocheuses -# T: de Terre-Neuve -# Y: du Yukon Yukon -# -# From Paul Eggert (1994-11-22): -# Alas, this sort of thing must be handled by localization software. - -# Unless otherwise specified, the data entries for Canada are all from Shanks -# & Pottenger. - -# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31, -# 2007-03-01): -# The British Columbia government announced yesterday that it will -# adjust daylight savings next year to align with changes in the -# U.S. and the rest of Canada.... -# https://archive.news.gov.bc.ca/releases/news_releases_2005-2009/2006AG0014-000330.htm -# ... -# Nova Scotia -# Daylight saving time will be extended by four weeks starting in 2007.... -# https://www.novascotia.ca/just/regulations/rg2/2006/ma1206.pdf -# -# [For New Brunswick] the new legislation dictates that the time change is to -# be done at 02:00 instead of 00:01. -# https://www.gnb.ca/0062/acts/BBA-2006/Chap-19.pdf -# ... -# Manitoba has traditionally changed the clock every fall at 03:00. -# As of 2006, the transition is to take place one hour earlier at 02:00. -# https://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php -# ... -# [Alberta, Ontario, Quebec] will follow US rules. -# http://www.qp.gov.ab.ca/documents/spring/CH03_06.CFM -# http://www.e-laws.gov.on.ca/DBLaws/Source/Regs/English/2006/R06111_e.htm -# http://www2.publicationsduquebec.gouv.qc.ca/dynamicSearch/telecharge.php?type=5&file=2006C39A.PDF -# ... -# P.E.I. will follow US rules.... -# http://www.assembly.pe.ca/bills/pdf_chapter/62/3/chapter-41.pdf -# ... -# Province of Newfoundland and Labrador.... -# http://www.hoa.gov.nl.ca/hoa/bills/Bill0634.htm -# ... -# Yukon -# https://www.gov.yk.ca/legislation/regs/oic2006_127.pdf -# ... -# N.W.T. will follow US rules. Whoever maintains the government web site -# does not seem to believe in bookmarks. To see the news release, click the -# following link and search for "Daylight Savings Time Change". Press the -# "Daylight Savings Time Change" link; it will fire off a popup using -# JavaScript. -# http://www.exec.gov.nt.ca/currentnews/currentPR.asp?mode=archive -# ... -# Nunavut -# An amendment to the Interpretation Act was registered on February 19/2007.... -# http://action.attavik.ca/home/justice-gn/attach/2007/gaz02part2.pdf - -# From Paul Eggert (2014-10-18): -# H. David Matthews and Mary Vincent's map -# "It's about TIME", _Canadian Geographic_ (September-October 1998) -# http://www.canadiangeographic.ca/Magazine/SO98/alacarte.asp -# contains detailed boundaries for regions observing nonstandard -# time and daylight saving time arrangements in Canada circa 1998. -# -# National Research Council Canada maintains info about time zones and DST. -# https://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html -# https://www.nrc-cnrc.gc.ca/eng/services/time/faq/index.html#Q5 -# Its unofficial information is often taken from Matthews and Vincent. - -# From Paul Eggert (2006-06-27): -# For now, assume all of DST-observing Canada will fall into line with the -# new US DST rules, - -# From Chris Walton (2011-12-01) -# In the first of Tammy Hardwick's articles -# http://www.ilovecreston.com/?p=articles&t=spec&ar=260 -# she quotes the Friday November 1/1918 edition of the Creston Review. -# The quote includes these two statements: -# 'Sunday the CPR went back to the old system of time...' -# '... The daylight saving scheme was dropped all over Canada at the same time,' -# These statements refer to a transition from daylight time to standard time -# that occurred nationally on Sunday October 27/1918. This transition was -# also documented in the Saturday October 26/1918 edition of the Toronto Star. - -# In light of that evidence, we alter the date from the earlier believed -# Oct 31, to Oct 27, 1918 (and Sunday is a more likely transition day -# than Thursday) in all Canadian rulesets. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Canada 1918 only - Apr 14 2:00 1:00 D -Rule Canada 1918 only - Oct 27 2:00 0 S -Rule Canada 1942 only - Feb 9 2:00 1:00 W # War -Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace -Rule Canada 1945 only - Sep 30 2:00 0 S -Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D -Rule Canada 1974 2006 - Oct lastSun 2:00 0 S -Rule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D -Rule Canada 2007 max - Mar Sun>=8 2:00 1:00 D -Rule Canada 2007 max - Nov Sun>=1 2:00 0 S - - -# Newfoundland and Labrador - -# From Paul Eggert (2017-10-14): -# Legally Labrador should observe Newfoundland time; see: -# McLeod J. Labrador time - legal or not? St. John's Telegram, 2017-10-07 -# http://www.thetelegram.com/news/local/labrador-time--legal-or-not-154860/ -# Matthews and Vincent (1998) write that the only part of Labrador -# that follows the rules is the southeast corner, including Port Hope -# Simpson and Mary's Harbour, but excluding, say, Black Tickle. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule StJohns 1917 only - Apr 8 2:00 1:00 D -Rule StJohns 1917 only - Sep 17 2:00 0 S -# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger. -Rule StJohns 1919 only - May 5 23:00 1:00 D -Rule StJohns 1919 only - Aug 12 23:00 0 S -# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger. -Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D -Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S -# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks & -# Pottenger. -Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D -Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S -# Whitman gives the following transitions: -# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07 -# but go with Shanks & Pottenger and assume they used Canadian rules. -# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives -# Apr 30 - Sep 24; go with Shanks & Pottenger. -Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D -Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S -Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D -Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S -Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S -# From Paul Eggert (2000-10-02): -# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches -# at 00:01 local time. For now, assume it started in 1987. - -# From Michael Pelley (2011-09-12): -# We received today, Monday, September 12, 2011, notification that the -# changes to the Newfoundland Standard Time Act have been proclaimed. -# The change in the Act stipulates that the change from Daylight Savings -# Time to Standard Time and from Standard Time to Daylight Savings Time -# now occurs at 2:00AM. -# ... -# http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.htm -# ... -# MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery -# Office of the Chief Information Officer -# Executive Council -# Government of Newfoundland & Labrador - -Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D -Rule StJohns 1987 2006 - Oct lastSun 0:01 0 S -Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD -Rule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D -Rule StJohns 2007 2011 - Mar Sun>=8 0:01 1:00 D -Rule StJohns 2007 2010 - Nov Sun>=1 0:01 0 S -# -# St John's has an apostrophe, but Posix file names can't have apostrophes. -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/St_Johns -3:30:52 - LMT 1884 - -3:30:52 StJohns N%sT 1918 - -3:30:52 Canada N%sT 1919 - -3:30:52 StJohns N%sT 1935 Mar 30 - -3:30 StJohns N%sT 1942 May 11 - -3:30 Canada N%sT 1946 - -3:30 StJohns N%sT 2011 Nov - -3:30 Canada N%sT - -# most of east Labrador - -# The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'. -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay - -3:30:52 - NST 1918 - -3:30:52 Canada N%sT 1919 - -3:30:52 - NST 1935 Mar 30 - -3:30 - NST 1936 - -3:30 StJohns N%sT 1942 May 11 - -3:30 Canada N%sT 1946 - -3:30 StJohns N%sT 1966 Mar 15 2:00 - -4:00 StJohns A%sT 2011 Nov - -4:00 Canada A%sT - - -# west Labrador, Nova Scotia, Prince Edward I - -# From Brian Inglis (2015-07-20): -# From the historical weather station records available at: -# https://weatherspark.com/history/28351/1971/Sydney-Nova-Scotia-Canada -# Sydney shares the same time history as Glace Bay, so was -# likely to be the same across the island.... -# Sydney, as the capital and most populous location, or Cape Breton, would -# have been better names for the zone had we known this in 1996. - -# From Paul Eggert (2015-07-20): -# Shanks & Pottenger write that since 1970 most of this region has been like -# Halifax. Many locales did not observe peacetime DST until 1972; -# the Cape Breton area, represented by Glace Bay, is the largest we know of -# (Glace Bay was perhaps not the best name choice but no point changing now). -# Shanks & Pottenger also write that Liverpool, NS was the only town -# in Canada to observe DST in 1971 but not 1970; for now we'll assume -# this is a typo. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Halifax 1916 only - Apr 1 0:00 1:00 D -Rule Halifax 1916 only - Oct 1 0:00 0 S -Rule Halifax 1920 only - May 9 0:00 1:00 D -Rule Halifax 1920 only - Aug 29 0:00 0 S -Rule Halifax 1921 only - May 6 0:00 1:00 D -Rule Halifax 1921 1922 - Sep 5 0:00 0 S -Rule Halifax 1922 only - Apr 30 0:00 1:00 D -Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D -Rule Halifax 1923 only - Sep 4 0:00 0 S -Rule Halifax 1924 only - Sep 15 0:00 0 S -Rule Halifax 1925 only - Sep 28 0:00 0 S -Rule Halifax 1926 only - May 16 0:00 1:00 D -Rule Halifax 1926 only - Sep 13 0:00 0 S -Rule Halifax 1927 only - May 1 0:00 1:00 D -Rule Halifax 1927 only - Sep 26 0:00 0 S -Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D -Rule Halifax 1928 only - Sep 9 0:00 0 S -Rule Halifax 1929 only - Sep 3 0:00 0 S -Rule Halifax 1930 only - Sep 15 0:00 0 S -Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S -Rule Halifax 1932 only - May 1 0:00 1:00 D -Rule Halifax 1933 only - Apr 30 0:00 1:00 D -Rule Halifax 1933 only - Oct 2 0:00 0 S -Rule Halifax 1934 only - May 20 0:00 1:00 D -Rule Halifax 1934 only - Sep 16 0:00 0 S -Rule Halifax 1935 only - Jun 2 0:00 1:00 D -Rule Halifax 1935 only - Sep 30 0:00 0 S -Rule Halifax 1936 only - Jun 1 0:00 1:00 D -Rule Halifax 1936 only - Sep 14 0:00 0 S -Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D -Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S -Rule Halifax 1939 only - May 28 0:00 1:00 D -Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D -Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D -Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S -Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D -Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S -Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D -Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S -Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D -Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Halifax -4:14:24 - LMT 1902 Jun 15 - -4:00 Halifax A%sT 1918 - -4:00 Canada A%sT 1919 - -4:00 Halifax A%sT 1942 Feb 9 2:00s - -4:00 Canada A%sT 1946 - -4:00 Halifax A%sT 1974 - -4:00 Canada A%sT -Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15 - -4:00 Canada A%sT 1953 - -4:00 Halifax A%sT 1954 - -4:00 - AST 1972 - -4:00 Halifax A%sT 1974 - -4:00 Canada A%sT - -# New Brunswick - -# From Paul Eggert (2007-01-31): -# The Time Definition Act -# says they changed at 00:01 through 2006, and -# makes it -# clear that this was the case since at least 1993. -# For now, assume it started in 1993. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D -Rule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S -Rule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D -Rule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S -Rule Moncton 1939 only - May 27 1:00 1:00 D -Rule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S -Rule Moncton 1940 only - May 19 1:00 1:00 D -Rule Moncton 1941 only - May 4 1:00 1:00 D -Rule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D -Rule Moncton 1946 1956 - Sep lastSun 2:00 0 S -Rule Moncton 1957 1972 - Oct lastSun 2:00 0 S -Rule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D -Rule Moncton 1993 2006 - Oct lastSun 0:01 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 - -5:00 - EST 1902 Jun 15 - -4:00 Canada A%sT 1933 - -4:00 Moncton A%sT 1942 - -4:00 Canada A%sT 1946 - -4:00 Moncton A%sT 1973 - -4:00 Canada A%sT 1993 - -4:00 Moncton A%sT 2007 - -4:00 Canada A%sT - -# Quebec - -# From Paul Eggert (2015-03-24): -# See America/Toronto for most of Quebec, including Montreal. -# -# Matthews and Vincent (1998) also write that Quebec east of the -63 -# meridian is supposed to observe AST, but residents as far east as -# Natashquan use EST/EDT, and residents east of Natashquan use AST. -# The Quebec department of justice writes in -# "The situation in Minganie and Basse-Côte-Nord" -# http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm -# that the coastal strip from just east of Natashquan to Blanc-Sablon -# observes Atlantic standard time all year round. -# https://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en -# says this common practice was codified into law as of 2007. -# For lack of better info, guess this practice began around 1970, contra to -# Shanks & Pottenger who have this region observing AST/ADT. - -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Blanc-Sablon -3:48:28 - LMT 1884 - -4:00 Canada A%sT 1970 - -4:00 - AST - -# Ontario - -# From Paul Eggert (2006-07-09): -# Shanks & Pottenger write that since 1970 most of Ontario has been like -# Toronto. -# Thunder Bay skipped DST in 1973. -# Many smaller locales did not observe peacetime DST until 1974; -# Nipigon (EST) and Rainy River (CST) are the largest that we know of. -# Far west Ontario is like Winnipeg; far east Quebec is like Halifax. - -# From Mark Brader (2003-07-26): -# [According to the Toronto Star] Orillia, Ontario, adopted DST -# effective Saturday, 1912-06-22, 22:00; the article mentions that -# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw -# have already done so. In Orillia DST was to run until Saturday, -# 1912-08-31 (no time mentioned), but it was met with considerable -# hostility from certain segments of the public, and was revoked after -# only two weeks - I copied it as Saturday, 1912-07-07, 22:00, but -# presumably that should be -07-06. (1912-06-19, -07-12; also letters -# earlier in June). -# -# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21). -# -# From Paul Eggert (2017-07-08): -# For more on Orillia, see: Daubs K. Bold attempt at daylight saving -# time became a comic failure in Orillia. Toronto Star 2017-07-08. -# https://www.thestar.com/news/insight/2017/07/08/bold-attempt-at-daylight-saving-time-became-a-comic-failure-in-orillia.html - -# From Paul Eggert (1997-10-17): -# Mark Brader writes that an article in the 1997-10-14 Toronto Star -# says that Atikokan, Ontario currently does not observe DST, -# but will vote on 11-10 whether to use EST/EDT. -# He also writes that the Ontario Time Act (1990, Chapter T.9) -# http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html -# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT. -# Officially Atikokan is therefore on CST/CDT, and most likely this report -# concerns a non-official time observed as a matter of local practice. -# -# From Paul Eggert (2000-10-02): -# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and -# New Osnaburgh observe CST all year, that Big Trout Lake observes -# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in -# violation of the official Ontario rules. -# -# From Paul Eggert (2006-07-09): -# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the -# 2005-07-21 Chronicle-Journal, which said: -# -# The clocks in Atikokan stay set on standard time year-round. -# This means they spend about half the time on central time and -# the other half on eastern time. -# -# For the most part, the system works, Mayor Dennis Brown said. -# -# "The majority of businesses in Atikokan deal more with Eastern -# Canada, but there are some that deal with Western Canada," he -# said. "I don't see any changes happening here." -# -# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang -# [New Osnaburgh] follow the same practice." - -# From Garry McKinnon (2006-07-14) via Chris Walton: -# I chatted with a member of my board who has an outstanding memory -# and a long history in Atikokan (and in the telecom industry) and he -# can say for certain that Atikokan has been practicing the current -# time keeping since 1952, at least. - -# From Paul Eggert (2006-07-17): -# Shanks & Pottenger say that Atikokan has agreed with Rainy River -# ever since standard time was introduced, but the information from -# McKinnon sounds more authoritative. For now, assume that Atikokan -# switched to EST immediately after WWII era daylight saving time -# ended. This matches the old (less-populous) America/Coral_Harbour -# entry since our cutoff date of 1970, so we can move -# America/Coral_Harbour to the 'backward' file. - -# From Mark Brader (2010-03-06): -# -# Currently the database has: -# -# # Ontario -# -# # From Paul Eggert (2006-07-09): -# # Shanks & Pottenger write that since 1970 most of Ontario has been like -# # Toronto. -# # Thunder Bay skipped DST in 1973. -# # Many smaller locales did not observe peacetime DST until 1974; -# # Nipigon (EST) and Rainy River (CST) are the largest that we know of. -# -# In the (Toronto) Globe and Mail for Saturday, 1955-09-24, in the bottom -# right corner of page 1, it says that Toronto will return to standard -# time at 2 am Sunday morning (which agrees with the database), and that: -# -# The one-hour setback will go into effect throughout most of Ontario, -# except in areas like Windsor which remains on standard time all year. -# -# Windsor is, of course, a lot larger than Nipigon. -# -# I only came across this incidentally. I don't know if Windsor began -# observing DST when Detroit did, or in 1974, or on some other date. -# -# By the way, the article continues by noting that: -# -# Some cities in the United States have pushed the deadline back -# three weeks and will change over from daylight saving in October. - -# From Arthur David Olson (2010-07-17): -# -# "Standard Time and Time Zones in Canada" appeared in -# The Journal of The Royal Astronomical Society of Canada, -# volume 26, number 2 (February 1932) and, as of 2010-07-17, -# was available at -# http://adsabs.harvard.edu/full/1932JRASC..26...49S -# -# It includes the text below (starting on page 57): -# -# A list of the places in Canada using daylight saving time would -# require yearly revision. From information kindly furnished by -# the provincial governments and by the postmasters in many cities -# and towns, it is found that the following places used daylight sav- -# ing in 1930. The information for the province of Quebec is definite, -# for the other provinces only approximate: -# -# Province Daylight saving time used -# Prince Edward Island Not used. -# Nova Scotia In Halifax only. -# New Brunswick In St. John only. -# Quebec In the following places: -# Montreal Lachine -# Quebec Mont-Royal -# Lévis Iberville -# St. Lambert Cap de la Madelèine -# Verdun Loretteville -# Westmount Richmond -# Outremont St. Jérôme -# Longueuil Greenfield Park -# Arvida Waterloo -# Chambly-Canton Beaulieu -# Melbourne La Tuque -# St. Théophile Buckingham -# Ontario Used generally in the cities and towns along -# the southerly part of the province. Not -# used in the northwesterly part. -# Manitoba Not used. -# Saskatchewan In Regina only. -# Alberta Not used. -# British Columbia Not used. -# -# With some exceptions, the use of daylight saving may be said to be limited -# to those cities and towns lying between Quebec city and Windsor, Ont. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Toronto 1919 only - Mar 30 23:30 1:00 D -Rule Toronto 1919 only - Oct 26 0:00 0 S -Rule Toronto 1920 only - May 2 2:00 1:00 D -Rule Toronto 1920 only - Sep 26 0:00 0 S -Rule Toronto 1921 only - May 15 2:00 1:00 D -Rule Toronto 1921 only - Sep 15 2:00 0 S -Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D -# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16" -# was meant. -Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S -Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D -# The 1927-to-1939 rules can be expressed more simply as -# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S -# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D -# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D -# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S -# The rules below avoid use of Sun>=25 -# (which pre-2004 versions of zic cannot handle). -Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S -Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D -Rule Toronto 1932 only - May 1 2:00 1:00 D -Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D -Rule Toronto 1933 only - Oct 1 2:00 0 S -Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S -Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S -Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D -Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D -Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S -Rule Toronto 1949 only - Nov lastSun 0:00 0 S -Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D -Rule Toronto 1950 only - Nov lastSun 2:00 0 S -Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S -# Shanks & Pottenger say Toronto ended DST a week early in 1971, -# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this -# is wrong, and that he had confirmed it by checking the 1971-10-30 -# Toronto Star, which said that DST was ending 1971-10-31 as usual. -Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S - -# From Paul Eggert (2003-07-27): -# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and -# Port Arthur, Ontario, the principle of the Bill has been in -# operation for the past three years, and in the City of Moose Jaw, -# Saskatchewan, for one year." - -# From David Bryan via Tory Tronrud, Director/Curator, -# Thunder Bay Museum (2003-11-12): -# There is some suggestion, however, that, by-law or not, daylight -# savings time was being practiced in Fort William and Port Arthur -# before 1909.... [I]n 1910, the line between the Eastern and Central -# Time Zones was permanently moved about two hundred miles west to -# include the Thunder Bay area.... When Canada adopted daylight -# savings time in 1916, Fort William and Port Arthur, having done so -# already, did not change their clocks.... During the Second World -# War,... [t]he cities agreed to implement DST during the summer -# months for the remainder of the war years. - -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Toronto -5:17:32 - LMT 1895 - -5:00 Canada E%sT 1919 - -5:00 Toronto E%sT 1942 Feb 9 2:00s - -5:00 Canada E%sT 1946 - -5:00 Toronto E%sT 1974 - -5:00 Canada E%sT -Zone America/Thunder_Bay -5:57:00 - LMT 1895 - -6:00 - CST 1910 - -5:00 - EST 1942 - -5:00 Canada E%sT 1970 - -5:00 Toronto E%sT 1973 - -5:00 - EST 1974 - -5:00 Canada E%sT -Zone America/Nipigon -5:53:04 - LMT 1895 - -5:00 Canada E%sT 1940 Sep 29 - -5:00 1:00 EDT 1942 Feb 9 2:00s - -5:00 Canada E%sT -Zone America/Rainy_River -6:18:16 - LMT 1895 - -6:00 Canada C%sT 1940 Sep 29 - -6:00 1:00 CDT 1942 Feb 9 2:00s - -6:00 Canada C%sT -Zone America/Atikokan -6:06:28 - LMT 1895 - -6:00 Canada C%sT 1940 Sep 29 - -6:00 1:00 CDT 1942 Feb 9 2:00s - -6:00 Canada C%sT 1945 Sep 30 2:00 - -5:00 - EST - - -# Manitoba - -# From Rob Douglas (2006-04-06): -# the old Manitoba Time Act - as amended by Bill 2, assented to -# March 27, 1987 ... said ... -# "between two o'clock Central Standard Time in the morning of -# the first Sunday of April of each year and two o'clock Central -# Standard Time in the morning of the last Sunday of October next -# following, one hour in advance of Central Standard Time."... -# I believe that the English legislation [of the old time act] had -# been assented to (March 22, 1967).... -# Also, as far as I can tell, there was no order-in-council varying -# the time of Daylight Saving Time for 2005 and so the provisions of -# the 1987 version would apply - the changeover was at 2:00 Central -# Standard Time (i.e. not until 3:00 Central Daylight Time). - -# From Paul Eggert (2006-04-10): -# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s) -# starting 1966. Since 02:00s is clearly correct for 1967 on, assume -# it was also 02:00s in 1966. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Winn 1916 only - Apr 23 0:00 1:00 D -Rule Winn 1916 only - Sep 17 0:00 0 S -Rule Winn 1918 only - Apr 14 2:00 1:00 D -Rule Winn 1918 only - Oct 27 2:00 0 S -Rule Winn 1937 only - May 16 2:00 1:00 D -Rule Winn 1937 only - Sep 26 2:00 0 S -Rule Winn 1942 only - Feb 9 2:00 1:00 W # War -Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace -Rule Winn 1945 only - Sep lastSun 2:00 0 S -Rule Winn 1946 only - May 12 2:00 1:00 D -Rule Winn 1946 only - Oct 13 2:00 0 S -Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D -Rule Winn 1947 1949 - Sep lastSun 2:00 0 S -Rule Winn 1950 only - May 1 2:00 1:00 D -Rule Winn 1950 only - Sep 30 2:00 0 S -Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D -Rule Winn 1951 1958 - Sep lastSun 2:00 0 S -Rule Winn 1959 only - Oct lastSun 2:00 0 S -Rule Winn 1960 only - Sep lastSun 2:00 0 S -Rule Winn 1963 only - Apr lastSun 2:00 1:00 D -Rule Winn 1963 only - Sep 22 2:00 0 S -Rule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D -Rule Winn 1966 2005 - Oct lastSun 2:00s 0 S -Rule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 - -6:00 Winn C%sT 2006 - -6:00 Canada C%sT - - -# Saskatchewan - -# From Mark Brader (2003-07-26): -# The first actual adoption of DST in Canada was at the municipal -# level. As the [Toronto] Star put it (1912-06-07), "While people -# elsewhere have long been talking of legislation to save daylight, -# the city of Moose Jaw [Saskatchewan] has acted on its own hook." -# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned: -# presumably late evening, as below), and would run until "the end of -# the summer". The discrepancy between municipal time and railroad -# time was noted. - -# From Paul Eggert (2003-07-27): -# Willett (1914-03) notes that DST "has been in operation ... in the -# City of Moose Jaw, Saskatchewan, for one year." - -# From Paul Eggert (2006-03-22): -# Shanks & Pottenger say that since 1970 this region has mostly been as Regina. -# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. -# Other western towns (e.g. Lloydminster) are like Edmonton. -# Matthews and Vincent (1998) write that Denare Beach and Creighton -# are like Winnipeg, in violation of Saskatchewan law. - -# From W. Jones (1992-11-06): -# The. . .below is based on information I got from our law library, the -# provincial archives, and the provincial Community Services department. -# A precise history would require digging through newspaper archives, and -# since you didn't say what you wanted, I didn't bother. -# -# Saskatchewan is split by a time zone meridian (105W) and over the years -# the boundary became pretty ragged as communities near it reevaluated -# their affiliations in one direction or the other. In 1965 a provincial -# referendum favoured legislating common time practices. -# -# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of -# Saskatchewan 1978) was proclaimed, and established that the eastern -# part of Saskatchewan would use CST year round, that districts in -# northwest Saskatchewan would by default follow CST but could opt to -# follow Mountain Time rules (thus 1 hour difference in the winter and -# zero in the summer), and that districts in southwest Saskatchewan would -# by default follow MT but could opt to follow CST. -# -# It took a few years for the dust to settle (I know one story of a town -# on one time zone having its school in another, such that a mom had to -# serve her family lunch in two shifts), but presently it seems that only -# a few towns on the border with Alberta (e.g. Lloydminster) follow MT -# rules any more; all other districts appear to have used CST year round -# since sometime in the 1960s. - -# From Chris Walton (2006-06-26): -# The Saskatchewan time act which was last updated in 1996 is about 30 pages -# long and rather painful to read. -# http://www.qp.gov.sk.ca/documents/English/Statutes/Statutes/T14.pdf - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Regina 1918 only - Apr 14 2:00 1:00 D -Rule Regina 1918 only - Oct 27 2:00 0 S -Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D -Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S -Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D -Rule Regina 1937 only - Oct Sun>=8 0:00 0 S -Rule Regina 1938 only - Oct Sun>=1 0:00 0 S -Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S -Rule Regina 1942 only - Feb 9 2:00 1:00 W # War -Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace -Rule Regina 1945 only - Sep lastSun 2:00 0 S -Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D -Rule Regina 1946 only - Oct Sun>=8 2:00 0 S -Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D -Rule Regina 1947 1957 - Sep lastSun 2:00 0 S -Rule Regina 1959 only - Apr lastSun 2:00 1:00 D -Rule Regina 1959 only - Oct lastSun 2:00 0 S -# -Rule Swift 1957 only - Apr lastSun 2:00 1:00 D -Rule Swift 1957 only - Oct lastSun 2:00 0 S -Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D -Rule Swift 1959 only - Oct lastSun 2:00 0 S -Rule Swift 1960 1961 - Sep lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Regina -6:58:36 - LMT 1905 Sep - -7:00 Regina M%sT 1960 Apr lastSun 2:00 - -6:00 - CST -Zone America/Swift_Current -7:11:20 - LMT 1905 Sep - -7:00 Canada M%sT 1946 Apr lastSun 2:00 - -7:00 Regina M%sT 1950 - -7:00 Swift M%sT 1972 Apr lastSun 2:00 - -6:00 - CST - - -# Alberta - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D -Rule Edm 1918 only - Oct 27 2:00 0 S -Rule Edm 1919 only - May 27 2:00 0 S -Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D -Rule Edm 1920 only - Oct lastSun 2:00 0 S -Rule Edm 1921 1923 - Sep lastSun 2:00 0 S -Rule Edm 1942 only - Feb 9 2:00 1:00 W # War -Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace -Rule Edm 1945 only - Sep lastSun 2:00 0 S -Rule Edm 1947 only - Apr lastSun 2:00 1:00 D -Rule Edm 1947 only - Sep lastSun 2:00 0 S -Rule Edm 1967 only - Apr lastSun 2:00 1:00 D -Rule Edm 1967 only - Oct lastSun 2:00 0 S -Rule Edm 1969 only - Apr lastSun 2:00 1:00 D -Rule Edm 1969 only - Oct lastSun 2:00 0 S -Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D -Rule Edm 1972 2006 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Edmonton -7:33:52 - LMT 1906 Sep - -7:00 Edm M%sT 1987 - -7:00 Canada M%sT - - -# British Columbia - -# From Paul Eggert (2006-03-22): -# Shanks & Pottenger write that since 1970 most of this region has -# been like Vancouver. -# Dawson Creek uses MST. Much of east BC is like Edmonton. -# Matthews and Vincent (1998) write that Creston is like Dawson Creek. - -# It seems though that (re: Creston) is not entirely correct: - -# From Chris Walton (2011-12-01): -# There are two areas within the Canadian province of British Columbia -# that do not currently observe daylight saving: -# a) The Creston Valley (includes the town of Creston and surrounding area) -# b) The eastern half of the Peace River Regional District -# (includes the cities of Dawson Creek and Fort St. John) - -# Earlier this year I stumbled across a detailed article about the time -# keeping history of Creston; it was written by Tammy Hardwick who is the -# manager of the Creston & District Museum. The article was written in May 2009. -# http://www.ilovecreston.com/?p=articles&t=spec&ar=260 -# According to the article, Creston has not changed its clocks since June 1918. -# i.e. Creston has been stuck on UT-7 for 93 years. -# Dawson Creek, on the other hand, changed its clocks as recently as April 1972. - -# Unfortunately the exact date for the time change in June 1918 remains -# unknown and will be difficult to ascertain. I e-mailed Tammy a few months -# ago to ask if Sunday June 2 was a reasonable guess. She said it was just -# as plausible as any other date (in June). She also said that after writing -# the article she had discovered another time change in 1916; this is the -# subject of another article which she wrote in October 2010. -# http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56 - -# Here is a summary of the three clock change events in Creston's history: -# 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7) -# Exact date unknown -# 2. Oct 1916: switch to Pacific Standard Time (GMT-8) -# Exact date in October unknown; Sunday October 1 is a reasonable guess. -# 3. June 1918: switch to Pacific Daylight Time (GMT-7) -# Exact date in June unknown; Sunday June 2 is a reasonable guess. -# note 1: -# On Oct 27/1918 when daylight saving ended in the rest of Canada, -# Creston did not change its clocks. -# note 2: -# During WWII when the Federal Government legislated a mandatory clock change, -# Creston did not oblige. -# note 3: -# There is no guarantee that Creston will remain on Mountain Standard Time -# (UTC-7) forever. -# The subject was debated at least once this year by the town Council. -# http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html - -# During a period WWII, summer time (Daylight saying) was mandatory in Canada. -# In Creston, that was handled by shifting the area to PST (-8:00) then applying -# summer time to cause the offset to be -7:00, the same as it had been before -# the change. It can be argued that the timezone abbreviation during this -# period should be PDT rather than MST, but that doesn't seem important enough -# (to anyone) to further complicate the rules. - -# The transition dates (and times) are guesses. - -# From Matt Johnson (2015-09-21): -# Fort Nelson, BC, Canada will cancel DST this year. So while previously they -# were aligned with America/Vancouver, they're now aligned with -# America/Dawson_Creek. -# http://www.northernrockies.ca/EN/meta/news/archives/2015/northern-rockies-time-change.html -# -# From Tim Parenti (2015-09-23): -# This requires a new zone for the Northern Rockies Regional Municipality, -# America/Fort_Nelson. The resolution of 2014-12-08 was reached following a -# 2014-11-15 poll with nearly 75% support. Effectively, the municipality has -# been on MST (-0700) like Dawson Creek since it advanced its clocks on -# 2015-03-08. -# -# From Paul Eggert (2015-09-23): -# Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Vanc 1918 only - Apr 14 2:00 1:00 D -Rule Vanc 1918 only - Oct 27 2:00 0 S -Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War -Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace -Rule Vanc 1945 only - Sep 30 2:00 0 S -Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D -Rule Vanc 1946 only - Oct 13 2:00 0 S -Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S -Rule Vanc 1962 2006 - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Vancouver -8:12:28 - LMT 1884 - -8:00 Vanc P%sT 1987 - -8:00 Canada P%sT -Zone America/Dawson_Creek -8:00:56 - LMT 1884 - -8:00 Canada P%sT 1947 - -8:00 Vanc P%sT 1972 Aug 30 2:00 - -7:00 - MST -Zone America/Fort_Nelson -8:10:47 - LMT 1884 - -8:00 Vanc P%sT 1946 - -8:00 - PST 1947 - -8:00 Vanc P%sT 1987 - -8:00 Canada P%sT 2015 Mar 8 2:00 - -7:00 - MST -Zone America/Creston -7:46:04 - LMT 1884 - -7:00 - MST 1916 Oct 1 - -8:00 - PST 1918 Jun 2 - -7:00 - MST - -# Northwest Territories, Nunavut, Yukon - -# From Paul Eggert (2006-03-22): -# Dawson switched to PST in 1973. Inuvik switched to MST in 1979. -# Mathew Englander (1996-10-07) gives the following refs: -# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68, -# c. 7 defines Yukon standard time as UTC-9.... -# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1). -# [https://www.canlii.org/en/ca/laws/stat/rsc-1985-c-i-21/latest/rsc-1985-c-i-21.html] -# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00. -# * O.I.C. 1980/02 established DST. -# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00. - -# From Brian Inglis (2015-04-14): -# -# I tried to trace the history of Yukon time and found the following -# regulations, giving the reference title and URL if found, regulation name, -# and relevant quote if available. Each regulation specifically revokes its -# predecessor. The final reference is to the current Interpretation Act -# authorizing and resulting from these regulatory changes. -# -# Only recent regulations were retrievable via Yukon government site search or -# index, and only some via Canadian legal sources. Other sources used include -# articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS -# Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and -# 1970 quoted below; each article includes current extracts from provincial -# and territorial ST and DST regulations at the end, summaries and details of -# standard times and daylight saving time at many locations across Canada, -# with time zone maps, tables and calculations for Canadian Sunrise, Sunset, -# and LMST; they also cover many countries and global locations, with a chart -# and table showing current Universal Time offsets, and may be useful as -# another source of information for 1970 and earlier. -# -# * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26, -# pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS) -# http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75: -# Yukon Interpretation Ordinance -# Yukon standard time is the local mean time at the one hundred and -# thirty-fifth meridian. -# -# * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.; -# JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System -# (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1: -# Yukon Interpretation Ordinance, 1955, Chap. 16. -# -# (1) Subject to this section, standard time shall be reckoned as nine -# hours behind Greenwich Time and called Yukon Standard Time. -# -# (2) Notwithstanding subsection (1), the Commissioner may make regulations -# varying the manner of reckoning standard time. -# -# * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance -# http://? - no online source found -# -# * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC, -# Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS) -# http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon -# Territory Commissioner's Order 1967-59 Interpretation Ordinance ... -# -# 1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon -# Territory on 27th January, 1966, is hereby revoked. -# -# 2. Yukon (East) Standard Time as defined by section 36 of the -# Interpretation Ordinance from and after mid-night on the 28th day of May, -# 1967 shall be reckoned in the same manner as Pacific Standard Time, that -# is to say, eight hours behind Greenwich Time in the area of the Yukon -# Territory lying east of the 138th degree longitude west. -# -# 3. In the remainder of the Territory, lying west of the 138th degree -# longitude west, Yukon (West) Standard Time shall be reckoned as nine -# hours behind Greenwich Time. -# -# * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214 -# https://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html -# C.O. 1973/214 INTERPRETATION ACT ... -# -# 1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby -# revoked. -# -# 2. Yukon Standard Time as defined by section 36 of the Interpretation -# Act from and after midnight on the twenty-eighth day of October, 1973 -# shall be reckoned in the same manner as Pacific Standard Time, that is -# to say eight hours behind Greenwich Time. -# -# * O.I.C. 1980/02 INTERPRETATION ACT -# http://? - no online source found -# -# * Yukon Daylight Saving Time, YOIC 1987/56 -# https://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html -# O.I.C. 1987/056 INTERPRETATION ACT ... -# -# In every year between -# (a) two o'clock in the morning in the first Sunday in April, and -# (b) two o'clock in the morning in the last Sunday in October, -# Standard Time shall be reckoned as seven hours behind Greenwich Time and -# called Yukon Daylight Saving Time. -# ... -# Dated ... 9th day of March, A.D., 1987. -# -# * Yukon Daylight Saving Time 2006, YOIC 2006/127 -# https://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html -# O.I.C. 2006/127 INTERPRETATION ACT ... -# -# 1. In Yukon each year the time for general purposes shall be 7 hours -# behind Greenwich mean time during the period commencing at two o'clock -# in the forenoon on the second Sunday of March and ending at two o'clock -# in the forenoon on the first Sunday of November and shall be called -# Yukon Daylight Saving Time. -# -# 2. Order-in-Council 1987/56 is revoked. -# -# 3. This order comes into force January 1, 2007. -# -# * Interpretation Act, RSY 2002, c 125 -# https://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html - -# From Rives McDow (1999-09-04): -# Nunavut ... moved ... to incorporate the whole territory into one time zone. -# Nunavut moves to single time zone Oct. 31 -# http://www.nunatsiaq.com/nunavut/nvt90903_13.html -# -# From Antoine Leca (1999-09-06): -# We then need to create a new timezone for the Kitikmeot region of Nunavut -# to differentiate it from the Yellowknife region. - -# From Paul Eggert (1999-09-20): -# Basic Facts: The New Territory -# http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html -# (1999) reports that Pangnirtung operates on eastern time, -# and that Coral Harbour does not observe DST. We don't know when -# Pangnirtung switched to eastern time; we'll guess 1995. - -# From Rives McDow (1999-11-08): -# On October 31, when the rest of Nunavut went to Central time, -# Pangnirtung wobbled. Here is the result of their wobble: -# -# The following businesses and organizations in Pangnirtung use Central Time: -# -# First Air, Power Corp, Nunavut Construction, Health Center, RCMP, -# Eastern Arctic National Parks, A & D Specialist -# -# The following businesses and organizations in Pangnirtung use Eastern Time: -# -# Hamlet office, All other businesses, Both schools, Airport operator -# -# This has made for an interesting situation there, which warranted the news. -# No one there that I spoke with seems concerned, or has plans to -# change the local methods of keeping time, as it evidently does not -# really interfere with any activities or make things difficult locally. -# They plan to celebrate New Year's turn-over twice, one hour apart, -# so it appears that the situation will last at least that long. -# The Nunavut Intergovernmental Affairs hopes that they will "come to -# their senses", but the locals evidently don't see any problem with -# the current state of affairs. - -# From Michaela Rodrigue, writing in the -# Nunatsiaq News (1999-11-19): -# http://www.nunatsiaqonline.ca/archives/nunavut991130/nvt91119_17.html -# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones, -# central - or Nunavut time - for government offices, and eastern time -# for municipal offices and schools.... Igloolik [was similar but then] -# made the switch to central time on Saturday, Nov. 6. - -# From Paul Eggert (2000-10-02): -# Matthews and Vincent (1998) say the following, but we lack histories -# for these potential new Zones. -# -# The Canadian Forces station at Alert uses Eastern Time while the -# handful of residents at the Eureka weather station [in the Central -# zone] skip daylight savings. Baffin Island, which is crossed by the -# Central, Eastern and Atlantic Time zones only uses Eastern Time. -# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of -# Central Time and Southampton Island [in the Central zone] is not -# required to use daylight savings. - -# From -# Nunavut now has two time zones (2000-11-10): -# The Nunavut government would allow its employees in Kugluktuk and -# Cambridge Bay to operate on central time year-round, putting them -# one hour behind the rest of Nunavut for six months during the winter. -# At the end of October the two communities had rebelled against -# Nunavut's unified time zone, refusing to shift to eastern time with -# the rest of the territory for the winter. Cambridge Bay remained on -# central time, while Kugluktuk, even farther west, reverted to -# mountain time, which they had used before the advent of Nunavut's -# unified time zone in 1999. -# -# From Rives McDow (2001-01-20), quoting the Nunavut government: -# The preceding decision came into effect at midnight, Saturday Nov 4, 2000. - -# From Paul Eggert (2000-12-04): -# Let's just keep track of the official times for now. - -# From Rives McDow (2001-03-07): -# The premier of Nunavut has issued a ministerial statement advising -# that effective 2001-04-01, the territory of Nunavut will revert -# back to three time zones (mountain, central, and eastern). Of the -# cities in Nunavut, Coral Harbor is the only one that I know of that -# has said it will not observe dst, staying on EST year round. I'm -# checking for more info, and will get back to you if I come up with -# more. -# [Also see (2001-03-09).] - -# From Gwillim Law (2005-05-21): -# According to ... -# http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp -# (from a 1998 Canadian Geographic article), the de facto and de jure time -# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year -# round. Using Google, it's easy to find other websites that confirm this. -# I wasn't able to find how far back this time regimen goes, but since it -# predates the creation of Nunavut, it probably goes back many years.... -# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used. -# -# From Paul Eggert (2014-10-17): -# For lack of better information, assume that Southampton Island observed -# daylight saving only during wartime. Gwillim Law's email also -# mentioned maps now maintained by National Research Council Canada; -# see above for an up-to-date link. - -# From Chris Walton (2007-03-01): -# ... the community of Resolute (located on Cornwallis Island in -# Nunavut) moved from Central Time to Eastern Time last November. -# Basically the community did not change its clocks at the end of -# daylight saving.... -# http://www.nnsl.com/frames/newspapers/2006-11/nov13_06none.html - -# From Chris Walton (2011-03-21): -# Back in 2007 I initiated the creation of a new "zone file" for Resolute -# Bay. Resolute Bay is a small community located about 900km north of -# the Arctic Circle. The zone file was required because Resolute Bay had -# decided to use UTC-5 instead of UTC-6 for the winter of 2006-2007. -# -# According to new information which I received last week, Resolute Bay -# went back to using UTC-6 in the winter of 2007-2008... -# -# On March 11/2007 most of Canada went onto daylight saving. On March -# 14/2007 I phoned the Resolute Bay hamlet office to do a "time check." I -# talked to somebody that was both knowledgeable and helpful. I was able -# to confirm that Resolute Bay was still operating on UTC-5. It was -# explained to me that Resolute Bay had been on the Eastern Time zone -# (EST) in the winter, and was now back on the Central Time zone (CDT). -# i.e. the time zone had changed twice in the last year but the clocks -# had not moved. The residents had to know which time zone they were in -# so they could follow the correct TV schedule... -# -# On Nov 02/2008 most of Canada went onto standard time. On Nov 03/2008 I -# phoned the Resolute Bay hamlet office...[D]ue to the challenging nature -# of the phone call, I decided to seek out an alternate source of -# information. I found an e-mail address for somebody by the name of -# Stephanie Adams whose job was listed as "Inns North Support Officer for -# Arctic Co-operatives." I was under the impression that Stephanie lived -# and worked in Resolute Bay... -# -# On March 14/2011 I phoned the hamlet office again. I was told that -# Resolute Bay had been using Central Standard Time over the winter of -# 2010-2011 and that the clocks had therefore been moved one hour ahead -# on March 13/2011. The person I talked to was aware that Resolute Bay -# had previously experimented with Eastern Standard Time but he could not -# tell me when the practice had stopped. -# -# On March 17/2011 I searched the Web to find an e-mail address of -# somebody that might be able to tell me exactly when Resolute Bay went -# off Eastern Standard Time. I stumbled on the name "Aziz Kheraj." Aziz -# used to be the mayor of Resolute Bay and he apparently owns half the -# businesses including "South Camp Inn." This website has some info on -# Aziz: -# http://www.uphere.ca/node/493 -# -# I sent Aziz an e-mail asking when Resolute Bay had stopped using -# Eastern Standard Time. -# -# Aziz responded quickly with this: "hi, The time was not changed for the -# 1 year only, the following year, the community went back to the old way -# of "spring ahead-fall behind" currently we are zulu plus 5 hrs and in -# the winter Zulu plus 6 hrs" -# -# This of course conflicted with everything I had ascertained in November 2008. -# -# I sent Aziz a copy of my 2008 e-mail exchange with Stephanie. Aziz -# responded with this: "Hi, Stephanie lives in Winnipeg. I live here, You -# may want to check with the weather office in Resolute Bay or do a -# search on the weather through Env. Canada. web site" -# -# If I had realized the Stephanie did not live in Resolute Bay I would -# never have contacted her. I now believe that all the information I -# obtained in November 2008 should be ignored... -# I apologize for reporting incorrect information in 2008. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule NT_YK 1918 only - Apr 14 2:00 1:00 D -Rule NT_YK 1918 only - Oct 27 2:00 0 S -Rule NT_YK 1919 only - May 25 2:00 1:00 D -Rule NT_YK 1919 only - Nov 1 0:00 0 S -Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War -Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace -Rule NT_YK 1945 only - Sep 30 2:00 0 S -Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD -Rule NT_YK 1965 only - Oct lastSun 2:00 0 S -Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D -Rule NT_YK 1980 2006 - Oct lastSun 2:00 0 S -Rule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -# aka Panniqtuuq -Zone America/Pangnirtung 0 - -00 1921 # trading post est. - -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00 - -5:00 Canada E%sT 1999 Oct 31 2:00 - -6:00 Canada C%sT 2000 Oct 29 2:00 - -5:00 Canada E%sT -# formerly Frobisher Bay -Zone America/Iqaluit 0 - -00 1942 Aug # Frobisher Bay est. - -5:00 NT_YK E%sT 1999 Oct 31 2:00 - -6:00 Canada C%sT 2000 Oct 29 2:00 - -5:00 Canada E%sT -# aka Qausuittuq -Zone America/Resolute 0 - -00 1947 Aug 31 # Resolute founded - -6:00 NT_YK C%sT 2000 Oct 29 2:00 - -5:00 - EST 2001 Apr 1 3:00 - -6:00 Canada C%sT 2006 Oct 29 2:00 - -5:00 - EST 2007 Mar 11 3:00 - -6:00 Canada C%sT -# aka Kangiqiniq -Zone America/Rankin_Inlet 0 - -00 1957 # Rankin Inlet founded - -6:00 NT_YK C%sT 2000 Oct 29 2:00 - -5:00 - EST 2001 Apr 1 3:00 - -6:00 Canada C%sT -# aka Iqaluktuuttiaq -Zone America/Cambridge_Bay 0 - -00 1920 # trading post est.? - -7:00 NT_YK M%sT 1999 Oct 31 2:00 - -6:00 Canada C%sT 2000 Oct 29 2:00 - -5:00 - EST 2000 Nov 5 0:00 - -6:00 - CST 2001 Apr 1 3:00 - -7:00 Canada M%sT -Zone America/Yellowknife 0 - -00 1935 # Yellowknife founded? - -7:00 NT_YK M%sT 1980 - -7:00 Canada M%sT -Zone America/Inuvik 0 - -00 1953 # Inuvik founded - -8:00 NT_YK P%sT 1979 Apr lastSun 2:00 - -7:00 NT_YK M%sT 1980 - -7:00 Canada M%sT -Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20 - -9:00 NT_YK Y%sT 1967 May 28 0:00 - -8:00 NT_YK P%sT 1980 - -8:00 Canada P%sT -Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 - -9:00 NT_YK Y%sT 1973 Oct 28 0:00 - -8:00 NT_YK P%sT 1980 - -8:00 Canada P%sT - - -############################################################################### - -# Mexico - -# From Paul Eggert (2014-12-07): -# The Investigation and Analysis Service of the -# Mexican Library of Congress (MLoC) has published a -# history of Mexican local time (in Spanish) -# http://www.diputados.gob.mx/bibliot/publica/inveyana/polisoc/horver/index.htm -# -# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC. -# (In all cases we go with the MLoC.) -# S&P report that Baja was at -8:00 in 1922/1923. -# S&P say the 1930 transition in Baja was 1930-11-16. -# S&P report no DST during summer 1931. -# S&P report a transition at 1932-03-30 23:00, not 1932-04-01. - -# From Gwillim Law (2001-02-20): -# There are some other discrepancies between the Decrees page and the -# tz database. I think they can best be explained by supposing that -# the researchers who prepared the Decrees page failed to find some of -# the relevant documents. - -# From Alan Perry (1996-02-15): -# A guy from our Mexico subsidiary finally found the Presidential Decree -# outlining the timezone changes in Mexico. -# -# ------------- Begin Forwarded Message ------------- -# -# I finally got my hands on the Official Presidential Decree that sets up the -# rules for the DST changes. The rules are: -# -# 1. The country is divided in 3 timezones: -# - Baja California Norte (the Mexico/BajaNorte TZ) -# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ) -# - The rest of the country (the Mexico/General TZ) -# -# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October -# at 2:00 AM, the times in each zone are as follows: -# BajaNorte: GMT+7 -# BajaSur: GMT+6 -# General: GMT+5 -# -# 3. The rest of the year, the times are as follows: -# BajaNorte: GMT+8 -# BajaSur: GMT+7 -# General: GMT+6 -# -# The Decree was published in Mexico's Official Newspaper on January 4th. -# -# -------------- End Forwarded Message -------------- -# From Paul Eggert (1996-06-12): -# For an English translation of the decree, see -# "Diario Oficial: Time Zone Changeover" (1996-01-04). -# http://mexico-travel.com/extra/timezone_eng.html - -# From Rives McDow (1998-10-08): -# The State of Quintana Roo has reverted back to central STD and DST times -# (i.e. UTC -0600 and -0500 as of 1998-08-02). - -# From Rives McDow (2000-01-10): -# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time -# zone 5 hours from the International Date Line, and will not observe daylight -# savings time so as to stay on the same time zone as the southern part of -# Arizona year round. - -# From Jesper Nørgaard, translating -# (2001-01-17): -# In Oaxaca, the 55.000 teachers from the Section 22 of the National -# Syndicate of Education Workers, refuse to apply daylight saving each -# year, so that the more than 10,000 schools work at normal hour the -# whole year. - -# From Gwillim Law (2001-01-19): -# ... says -# (translated):... -# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced -# that Summer Time will be reduced from seven to five months, starting -# this year.... -# http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001 -# [translated], says "summer time will ... take effect on the first Sunday -# in May, and end on the last Sunday of September. - -# From Arthur David Olson (2001-01-25): -# The 2001-01-24 traditional Washington Post contained the page one -# story "Timely Issue Divides Mexicans."... -# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html -# ... Mexico City Mayor López Obrador "...is threatening to keep -# Mexico City and its 20 million residents on a different time than -# the rest of the country..." In particular, López Obrador would abolish -# observation of Daylight Saving Time. - -# Official statute published by the Energy Department -# http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre -# (2001-02-01) shows Baja and Chihauhua as still using US DST rules, -# and Sonora with no DST. This was reported by Jesper Nørgaard (2001-02-03). - -# From Paul Eggert (2001-03-03): -# -# http://www.latimes.com/news/nation/20010303/t000018766.html -# James F. Smith writes in today's LA Times -# * Sonora will continue to observe standard time. -# * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that -# the Federal District will not adopt DST. -# * 4 of 16 district leaders announced they'll ignore the decree. -# * The decree does not affect federal-controlled facilities including -# the airport, banks, hospitals, and schools. -# -# For now we'll assume that the Federal District will bow to federal rules. - -# From Jesper Nørgaard (2001-04-01): -# I found some references to the Mexican application of daylight -# saving, which modifies what I had already sent you, stating earlier -# that a number of northern Mexican states would go on daylight -# saving. The modification reverts this to only cover Baja California -# (Norte), while all other states (except Sonora, who has no daylight -# saving all year) will follow the original decree of president -# Vicente Fox, starting daylight saving May 6, 2001 and ending -# September 30, 2001. -# References: "Diario de Monterrey" -# Palabra (2001-03-31) - -# From Reuters (2001-09-04): -# Mexico's Supreme Court on Tuesday declared that daylight savings was -# unconstitutional in Mexico City, creating the possibility the -# capital will be in a different time zone from the rest of the nation -# next year.... The Supreme Court's ruling takes effect at 2:00 -# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to -# standard time. "This is so residents of the Federal District are not -# subject to unexpected time changes," a statement from the court said. - -# From Jesper Nørgaard Welen (2002-03-12): -# ... consulting my local grocery store(!) and my coworkers, they all insisted -# that a new decision had been made to reinstate US style DST in Mexico.... -# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20) -# confirms this. Sonora as usual is the only state where DST is not applied. - -# From Steffen Thorsen (2009-12-28): -# -# Steffen Thorsen wrote: -# > Mexico's House of Representatives has approved a proposal for northern -# > Mexico's border cities to share the same daylight saving schedule as -# > the United States. -# Now this has passed both the Congress and the Senate, so starting from -# 2010, some border regions will be the same: -# http://www.signonsandiego.com/news/2009/dec/28/clocks-will-match-both-sides-border/ -# http://www.elmananarey.com/diario/noticia/nacional/noticias/empatan_horario_de_frontera_con_eu/621939 -# (Spanish) -# -# Could not find the new law text, but the proposed law text changes are here: -# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/20091210-V.pdf -# (Gaceta Parlamentaria) -# -# There is also a list of the votes here: -# http://gaceta.diputados.gob.mx/Gaceta/61/2009/dic/V2-101209.html -# -# Our page: -# https://www.timeanddate.com/news/time/north-mexico-dst-change.html - -# From Arthur David Olson (2010-01-20): -# The page -# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 -# includes this text: -# En los municipios fronterizos de Tijuana y Mexicali en Baja California; -# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila; -# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en -# Tamaulipas, la aplicación de este horario estacional surtirá efecto -# desde las dos horas del segundo domingo de marzo y concluirá a las dos -# horas del primer domingo de noviembre. -# En los municipios fronterizos que se encuentren ubicados en la franja -# fronteriza norte en el territorio comprendido entre la línea -# internacional y la línea paralela ubicada a una distancia de veinte -# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el -# interior del país, la aplicación de este horario estacional surtirá -# efecto desde las dos horas del segundo domingo de marzo y concluirá a -# las dos horas del primer domingo de noviembre. - -# From Steffen Thorsen (2014-12-08), translated by Gwillim Law: -# The Mexican state of Quintana Roo will likely change to EST in 2015. -# -# http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo -# "With this change, the time conflict that has existed between the municipios -# of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an -# end. The latter declared itself in rebellion 15 years ago when a time change -# was initiated in Mexico, and since then it has refused to change its time -# zone along with the rest of the country." -# -# From Steffen Thorsen (2015-01-14), translated by Gwillim Law: -# http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html -# "...the new time zone will come into effect at two o'clock on the first Sunday -# of February, when we will have to advance the clock one hour from its current -# time..." -# Also, the new zone will not use DST. -# -# From Carlos Raúl Perasso (2015-02-02): -# The decree that modifies the Mexican Hour System Law has finally -# been published at the Diario Oficial de la Federación -# http://www.dof.gob.mx/nota_detalle.php?codigo=5380123&fecha=31/01/2015 -# It establishes 5 zones for Mexico: -# 1- Zona Centro (Central Zone): Corresponds to longitude 90 W, -# includes most of Mexico, excluding what's mentioned below. -# 2- Zona Pacífico (Pacific Zone): Longitude 105 W, includes the -# states of Baja California Sur; Chihuahua; Nayarit (excluding Bahía -# de Banderas which lies in Central Zone); Sinaloa and Sonora. -# 3- Zona Noroeste (Northwest Zone): Longitude 120 W, includes the -# state of Baja California. -# 4- Zona Sureste (Southeast Zone): Longitude 75 W, includes the state -# of Quintana Roo. -# 5- The islands, reefs and keys shall take their timezone from the -# longitude they are located at. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Mexico 1939 only - Feb 5 0:00 1:00 D -Rule Mexico 1939 only - Jun 25 0:00 0 S -Rule Mexico 1940 only - Dec 9 0:00 1:00 D -Rule Mexico 1941 only - Apr 1 0:00 0 S -Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War -Rule Mexico 1944 only - May 1 0:00 0 S -Rule Mexico 1950 only - Feb 12 0:00 1:00 D -Rule Mexico 1950 only - Jul 30 0:00 0 S -Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D -Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S -Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D -Rule Mexico 2001 only - Sep lastSun 2:00 0 S -Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D -Rule Mexico 2002 max - Oct lastSun 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -# Quintana Roo; represented by Cancún -Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 - -6:00 - CST 1981 Dec 23 - -5:00 Mexico E%sT 1998 Aug 2 2:00 - -6:00 Mexico C%sT 2015 Feb 1 2:00 - -5:00 - EST -# Campeche, Yucatán; represented by Mérida -Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 - -6:00 - CST 1981 Dec 23 - -5:00 - EST 1982 Dec 2 - -6:00 Mexico C%sT -# Coahuila, Nuevo León, Tamaulipas (near US border) -# This includes the following municipalities: -# in Coahuila: Ocampo, Acuña, Zaragoza, Jiménez, Piedras Negras, Nava, -# Guerrero, Hidalgo. -# in Nuevo León: Anáhuac, Los Aldama. -# in Tamaulipas: Nuevo Laredo, Guerrero, Mier, Miguel Alemán, Camargo, -# Gustavo Díaz Ordaz, Reynosa, Río Bravo, Valle Hermoso, Matamoros. -# See: Inicia mañana Horario de Verano en zona fronteriza, El Universal, -# 2016-03-12 -# http://www.eluniversal.com.mx/articulo/estados/2016/03/12/inicia-manana-horario-de-verano-en-zona-fronteriza -Zone America/Matamoros -6:40:00 - LMT 1921 Dec 31 23:20:00 - -6:00 - CST 1988 - -6:00 US C%sT 1989 - -6:00 Mexico C%sT 2010 - -6:00 US C%sT -# Durango; Coahuila, Nuevo León, Tamaulipas (away from US border) -Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44 - -6:00 - CST 1988 - -6:00 US C%sT 1989 - -6:00 Mexico C%sT -# Central Mexico -Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 - -7:00 - MST 1927 Jun 10 23:00 - -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 - -6:00 Mexico C%sT 2001 Sep 30 2:00 - -6:00 - CST 2002 Feb 20 - -6:00 Mexico C%sT -# Chihuahua (near US border) -# This includes the municipalities of Janos, Ascensión, Juárez, Guadalupe, -# Práxedis G Guerrero, Coyame del Sotol, Ojinaga, and Manuel Benavides. -# (See the 2016-03-12 El Universal source mentioned above.) -Zone America/Ojinaga -6:57:40 - LMT 1922 Jan 1 0:02:20 - -7:00 - MST 1927 Jun 10 23:00 - -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 - -6:00 - CST 1996 - -6:00 Mexico C%sT 1998 - -6:00 - CST 1998 Apr Sun>=1 3:00 - -7:00 Mexico M%sT 2010 - -7:00 US M%sT -# Chihuahua (away from US border) -Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40 - -7:00 - MST 1927 Jun 10 23:00 - -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 - -6:00 - CST 1996 - -6:00 Mexico C%sT 1998 - -6:00 - CST 1998 Apr Sun>=1 3:00 - -7:00 Mexico M%sT -# Sonora -Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 - -7:00 - MST 1927 Jun 10 23:00 - -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 - -6:00 - CST 1942 Apr 24 - -7:00 - MST 1949 Jan 14 - -8:00 - PST 1970 - -7:00 Mexico M%sT 1999 - -7:00 - MST - -# From Alexander Krivenyshev (2010-04-21): -# According to news, Bahía de Banderas (Mexican state of Nayarit) -# changed time zone UTC-7 to new time zone UTC-6 on April 4, 2010 (to -# share the same time zone as nearby city Puerto Vallarta, Jalisco). -# -# (Spanish) -# Bahía de Banderas homologa su horario al del centro del -# país, a partir de este domingo -# http://www.nayarit.gob.mx/notes.asp?id=20748 -# -# Bahía de Banderas homologa su horario con el del Centro del -# País -# http://www.bahiadebanderas.gob.mx/principal/index.php?option=com_content&view=article&id=261:bahia-de-banderas-homologa-su-horario-con-el-del-centro-del-pais&catid=42:comunicacion-social&Itemid=50 -# -# (English) -# Puerto Vallarta and Bahía de Banderas: One Time Zone -# http://virtualvallarta.com/puertovallarta/puertovallarta/localnews/2009-12-03-Puerto-Vallarta-and-Bahia-de-Banderas-One-Time-Zone.shtml -# http://www.worldtimezone.com/dst_news/dst_news_mexico08.html -# -# "Mexico's Senate approved the amendments to the Mexican Schedule System that -# will allow Bahía de Banderas and Puerto Vallarta to share the same time -# zone ..." -# Baja California Sur, Nayarit, Sinaloa - -# From Arthur David Olson (2010-05-01): -# Use "Bahia_Banderas" to keep the name to fourteen characters. - -# Mazatlán -Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 - -7:00 - MST 1927 Jun 10 23:00 - -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 - -6:00 - CST 1942 Apr 24 - -7:00 - MST 1949 Jan 14 - -8:00 - PST 1970 - -7:00 Mexico M%sT - -# Bahía de Banderas -Zone America/Bahia_Banderas -7:01:00 - LMT 1921 Dec 31 23:59:00 - -7:00 - MST 1927 Jun 10 23:00 - -6:00 - CST 1930 Nov 15 - -7:00 - MST 1931 May 1 23:00 - -6:00 - CST 1931 Oct - -7:00 - MST 1932 Apr 1 - -6:00 - CST 1942 Apr 24 - -7:00 - MST 1949 Jan 14 - -8:00 - PST 1970 - -7:00 Mexico M%sT 2010 Apr 4 2:00 - -6:00 Mexico C%sT - -# Baja California -Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 - -7:00 - MST 1924 - -8:00 - PST 1927 Jun 10 23:00 - -7:00 - MST 1930 Nov 15 - -8:00 - PST 1931 Apr 1 - -8:00 1:00 PDT 1931 Sep 30 - -8:00 - PST 1942 Apr 24 - -8:00 1:00 PWT 1945 Aug 14 23:00u - -8:00 1:00 PPT 1945 Nov 12 # Peace - -8:00 - PST 1948 Apr 5 - -8:00 1:00 PDT 1949 Jan 14 - -8:00 - PST 1954 - -8:00 CA P%sT 1961 - -8:00 - PST 1976 - -8:00 US P%sT 1996 - -8:00 Mexico P%sT 2001 - -8:00 US P%sT 2002 Feb 20 - -8:00 Mexico P%sT 2010 - -8:00 US P%sT -# From Paul Eggert (2006-03-22): -# Formerly there was an America/Ensenada zone, which differed from -# America/Tijuana only in that it did not observe DST from 1976 -# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say -# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports -# that the 1987 OAG says "Only Ensenada, Mexicali, San Felipe and -# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that -# DST-observance was a town-by-town matter back then. This concerns -# data after 1970 so most likely there should be at least one Zone -# other than America/Tijuana for Baja, but it's not clear yet what its -# name or contents should be. -# -# From Paul Eggert (2015-10-08): -# Formerly there was an America/Santa_Isabel zone, but this appears to -# have come from a misreading of -# http://dof.gob.mx/nota_detalle.php?codigo=5127480&fecha=06/01/2010 -# It has been moved to the 'backward' file. -# -# -# Revillagigedo Is -# no information - -############################################################################### - -# Anguilla -# Antigua and Barbuda -# See America/Port_of_Spain. - -# Bahamas -# -# For 1899 Milne gives -5:09:29.5; round that. -# -# From Sue Williams (2006-12-07): -# The Bahamas announced about a month ago that they plan to change their DST -# rules to sync with the U.S. starting in 2007.... -# http://www.jonesbahamas.com/?c=45&a=10412 - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Bahamas 1964 1975 - Oct lastSun 2:00 0 S -Rule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Nassau -5:09:30 - LMT 1912 Mar 2 - -5:00 Bahamas E%sT 1976 - -5:00 US E%sT - -# Barbados - -# For 1899 Milne gives -3:58:29.2; round that. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Barb 1977 only - Jun 12 2:00 1:00 D -Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S -Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D -Rule Barb 1979 only - Sep 30 2:00 0 S -Rule Barb 1980 only - Sep 25 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Barbados -3:58:29 - LMT 1924 # Bridgetown - -3:58:29 - BMT 1932 # Bridgetown Mean Time - -4:00 Barb A%sT - -# Belize -# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 -0530 -Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 CST -Rule Belize 1973 only - Dec 5 0:00 1:00 CDT -Rule Belize 1974 only - Feb 9 0:00 0 CST -Rule Belize 1982 only - Dec 18 0:00 1:00 CDT -Rule Belize 1983 only - Feb 12 0:00 0 CST -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Belize -5:52:48 - LMT 1912 Apr - -6:00 Belize %s - -# Bermuda - -# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower, -# Bermuda dockyard, Ireland I; round that. - -# From Dan Jones, reporting in The Royal Gazette (2006-06-26): - -# Next year, however, clocks in the US will go forward on the second Sunday -# in March, until the first Sunday in November. And, after the Time Zone -# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on -# Friday, the same thing will happen in Bermuda. -# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135 - -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton - -4:00 - AST 1974 Apr 28 2:00 - -4:00 Canada A%sT 1976 - -4:00 US A%sT - -# Cayman Is -# See America/Panama. - -# Costa Rica - -# Milne gives -5:36:13.3 as San José mean time; round to nearest. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D -Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S -Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D -# IATA SSIM (1991-09) says the following was at 1:00; -# go with Shanks & Pottenger. -Rule CR 1991 only - Jul 1 0:00 0 S -Rule CR 1992 only - Mar 15 0:00 0 S -# There are too many San Josés elsewhere, so we'll use 'Costa Rica'. -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Costa_Rica -5:36:13 - LMT 1890 # San José - -5:36:13 - SJMT 1921 Jan 15 # San José Mean Time - -6:00 CR C%sT -# Coco -# no information; probably like America/Costa_Rica - -# Cuba - -# From Paul Eggert (2013-02-21): -# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57 -# for the port, and -5:30 for meteorological observations. -# For now, stick with Shanks & Pottenger. - -# From Arthur David Olson (1999-03-29): -# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between -# the Cuban National Team and the Baltimore Orioles was carried live on -# the Orioles Radio Network, including affiliate WTOP in Washington, DC. -# During the game, play-by-play announcer Jim Hunter noted that -# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving -# Time today." (The "two hour" remark referred to losing one hour of -# sleep on 1999-03-28 - when the announcers were in Cuba as it switched -# to DST - and one more hour on 1999-04-04 - when the announcers will have -# returned to Baltimore, which switches on that date.) - -# From Steffen Thorsen (2013-11-11): -# DST start in Cuba in 2004 ... does not follow the same rules as the -# years before. The correct date should be Sunday 2004-03-28 00:00 ... -# https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html - -# From Evert van der Veer via Steffen Thorsen (2004-10-28): -# Cuba is not going back to standard time this year. -# From Paul Eggert (2006-03-22): -# http://www.granma.cu/ingles/2004/septiembre/juev30/41medid-i.html -# says that it's due to a problem at the Antonio Guiteras -# thermoelectric plant, and says "This October there will be no return -# to normal hours (after daylight saving time)". -# For now, let's assume that it's a temporary measure. - -# From Carlos A. Carnero Delgado (2005-11-12): -# This year (just like in 2004-2005) there's no change in time zone -# adjustment in Cuba. We will stay in daylight saving time: -# http://www.granma.cu/espanol/2005/noviembre/mier9/horario.html - -# From Jesper Nørgaard Welen (2006-10-21): -# An article in GRANMA INTERNACIONAL claims that Cuba will end -# the 3 years of permanent DST next weekend, see -# http://www.granma.cu/ingles/2006/octubre/lun16/43horario.html -# "On Saturday night, October 28 going into Sunday, October 29, at 01:00, -# watches should be set back one hour - going back to 00:00 hours - returning -# to the normal schedule.... - -# From Paul Eggert (2007-03-02): -# , dated yesterday, -# says Cuban clocks will advance at midnight on March 10. -# For lack of better information, assume Cuba will use US rules, -# except that it switches at midnight standard time as usual. -# -# From Steffen Thorsen (2007-10-25): -# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week -# earlier - on the last Sunday of October, just like in 2006. -# -# He supplied these references: -# -# http://www.prensalatina.com.mx/article.asp?ID=%7B4CC32C1B-A9F7-42FB-8A07-8631AFC923AF%7D&language=ES -# http://actualidad.terra.es/sociedad/articulo/cuba_llama_ahorrar_energia_cambio_1957044.htm -# -# From Alex Krivenyshev (2007-10-25): -# Here is also article from Granma (Cuba): -# -# Regirá el Horario Normal desde el próximo domingo 28 de octubre -# http://www.granma.cubaweb.cu/2007/10/24/nacional/artic07.html -# -# http://www.worldtimezone.com/dst_news/dst_news_cuba03.html - -# From Arthur David Olson (2008-03-09): -# I'm in Maryland which is now observing United States Eastern Daylight -# Time. At 9:44 local time I used RealPlayer to listen to -# http://media.enet.cu/radioreloj -# a Cuban information station, and heard -# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"), -# indicating that Cuba is still on standard time. - -# From Steffen Thorsen (2008-03-12): -# It seems that Cuba will start DST on Sunday, 2007-03-16... -# It was announced yesterday, according to this source (in Spanish): -# http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm -# -# Some more background information is posted here: -# https://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html -# -# The article also says that Cuba has been observing DST since 1963, -# while Shanks (and tzdata) has 1965 as the first date (except in the -# 1940's). Many other web pages in Cuba also claim that it has been -# observed since 1963, but with the exception of 1970 - an exception -# which is not present in tzdata/Shanks. So there is a chance we need to -# change some historic records as well. -# -# One example: -# http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm - -# From Jesper Nørgaard Welen (2008-03-13): -# The Cuban time change has just been confirmed on the most authoritative -# web site, the Granma. Please check out -# http://www.granma.cubaweb.cu/2008/03/13/nacional/artic10.html -# -# Basically as expected after Steffen Thorsen's information, the change -# will take place midnight between Saturday and Sunday. - -# From Arthur David Olson (2008-03-12): -# Assume Sun>=15 (third Sunday) going forward. - -# From Alexander Krivenyshev (2009-03-04) -# According to the Radio Reloj - Cuba will start Daylight Saving Time on -# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009- -# not on midnight March 14 / March 15 as previously thought. -# -# http://www.worldtimezone.com/dst_news/dst_news_cuba05.html -# (in Spanish) - -# From Arthur David Olson (2009-03-09) -# I listened over the Internet to -# http://media.enet.cu/readioreloj -# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the -# the time was announced as "diez cinco" - the same time as here, indicating -# that has indeed switched to DST. Assume second Sunday from 2009 forward. - -# From Steffen Thorsen (2011-03-08): -# Granma announced that Cuba is going to start DST on 2011-03-20 00:00:00 -# this year. Nothing about the end date known so far (if that has -# changed at all). -# -# Source: -# http://granma.co.cu/2011/03/08/nacional/artic01.html -# -# Our info: -# https://www.timeanddate.com/news/time/cuba-starts-dst-2011.html -# -# From Steffen Thorsen (2011-10-30) -# Cuba will end DST two weeks later this year. Instead of going back -# tonight, it has been delayed to 2011-11-13 at 01:00. -# -# One source (Spanish) -# http://www.radioangulo.cu/noticias/cuba/17105-cuba-restablecera-el-horario-del-meridiano-de-greenwich.html -# -# Our page: -# https://www.timeanddate.com/news/time/cuba-time-changes-2011.html -# -# From Steffen Thorsen (2012-03-01) -# According to Radio Reloj, Cuba will start DST on Midnight between March -# 31 and April 1. -# -# Radio Reloj has the following info (Spanish): -# http://www.radioreloj.cu/index.php/noticias-radio-reloj/71-miscelaneas/7529-cuba-aplicara-el-horario-de-verano-desde-el-1-de-abril -# -# Our info on it: -# https://www.timeanddate.com/news/time/cuba-starts-dst-2012.html - -# From Steffen Thorsen (2012-11-03): -# Radio Reloj and many other sources report that Cuba is changing back -# to standard time on 2012-11-04: -# http://www.radioreloj.cu/index.php/noticias-radio-reloj/36-nacionales/9961-regira-horario-normal-en-cuba-desde-el-domingo-cuatro-de-noviembre -# From Paul Eggert (2012-11-03): -# For now, assume the future rule is first Sunday in November. - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Cuba 1928 only - Jun 10 0:00 1:00 D -Rule Cuba 1928 only - Oct 10 0:00 0 S -Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D -Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S -Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D -Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S -Rule Cuba 1965 only - Jun 1 0:00 1:00 D -Rule Cuba 1965 only - Sep 30 0:00 0 S -Rule Cuba 1966 only - May 29 0:00 1:00 D -Rule Cuba 1966 only - Oct 2 0:00 0 S -Rule Cuba 1967 only - Apr 8 0:00 1:00 D -Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S -Rule Cuba 1968 only - Apr 14 0:00 1:00 D -Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D -Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S -Rule Cuba 1972 1974 - Oct 8 0:00 0 S -Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S -Rule Cuba 1978 only - May 7 0:00 1:00 D -Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S -Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D -Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D -Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D -Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D -Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S -Rule Cuba 1996 only - Oct 6 0:00s 0 S -Rule Cuba 1997 only - Oct 12 0:00s 0 S -Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D -Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S -Rule Cuba 2000 2003 - Apr Sun>=1 0:00s 1:00 D -Rule Cuba 2004 only - Mar lastSun 0:00s 1:00 D -Rule Cuba 2006 2010 - Oct lastSun 0:00s 0 S -Rule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D -Rule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D -Rule Cuba 2009 2010 - Mar Sun>=8 0:00s 1:00 D -Rule Cuba 2011 only - Mar Sun>=15 0:00s 1:00 D -Rule Cuba 2011 only - Nov 13 0:00s 0 S -Rule Cuba 2012 only - Apr 1 0:00s 1:00 D -Rule Cuba 2012 max - Nov Sun>=1 0:00s 0 S -Rule Cuba 2013 max - Mar Sun>=8 0:00s 1:00 D - -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Havana -5:29:28 - LMT 1890 - -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT - -5:00 Cuba C%sT - -# Dominica -# See America/Port_of_Spain. - -# Dominican Republic - -# From Steffen Thorsen (2000-10-30): -# Enrique Morales reported to me that the Dominican Republic has changed the -# time zone to Eastern Standard Time as of Sunday 29 at 2 am.... -# http://www.listin.com.do/antes/261000/republica/princi.html - -# From Paul Eggert (2000-12-04): -# That URL (2000-10-26, in Spanish) says they planned to use US-style DST. - -# From Rives McDow (2000-12-01): -# Dominican Republic changed its mind and presidential decree on Tuesday, -# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the -# Dominican Republic will be reverting to 8 hours from the International Date -# Line, and will not be using DST in the foreseeable future. The reason they -# decided to use DST was to be in synch with Puerto Rico, who was also going -# to implement DST. When Puerto Rico didn't implement DST, the president -# decided to revert. - - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule DR 1966 only - Oct 30 0:00 1:00 EDT -Rule DR 1967 only - Feb 28 0:00 0 EST -Rule DR 1969 1973 - Oct lastSun 0:00 0:30 -0430 -Rule DR 1970 only - Feb 21 0:00 0 EST -Rule DR 1971 only - Jan 20 0:00 0 EST -Rule DR 1972 1974 - Jan 21 0:00 0 EST -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Santo_Domingo -4:39:36 - LMT 1890 - -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT - -5:00 DR %s 1974 Oct 27 - -4:00 - AST 2000 Oct 29 2:00 - -5:00 US E%sT 2000 Dec 3 1:00 - -4:00 - AST - -# El Salvador - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D -Rule Salv 1987 1988 - Sep lastSun 0:00 0 S -# There are too many San Salvadors elsewhere, so use America/El_Salvador -# instead of America/San_Salvador. -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador - -6:00 Salv C%sT - -# Grenada -# Guadeloupe -# St Barthélemy -# St Martin (French part) -# See America/Port_of_Spain. - -# Guatemala -# -# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen: -# Diario Co Latino, at -# , -# says in an article dated 2006-04-19 that the Guatemalan government had -# decided on that date to advance official time by 60 minutes, to lessen the -# impact of the elevated cost of oil.... Daylight saving time will last from -# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified). -# From Paul Eggert (2006-06-22): -# The Ministry of Energy and Mines, press release CP-15/2006 -# (2006-04-19), says DST ends at 24:00. See -# http://www.sieca.org.gt/Sitio_publico/Energeticos/Doc/Medidas/Cambio_Horario_Nac_190406.pdf - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Guat 1973 only - Nov 25 0:00 1:00 D -Rule Guat 1974 only - Feb 24 0:00 0 S -Rule Guat 1983 only - May 21 0:00 1:00 D -Rule Guat 1983 only - Sep 22 0:00 0 S -Rule Guat 1991 only - Mar 23 0:00 1:00 D -Rule Guat 1991 only - Sep 7 0:00 0 S -Rule Guat 2006 only - Apr 30 0:00 1:00 D -Rule Guat 2006 only - Oct 1 0:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 - -6:00 Guat C%sT - -# Haiti -# From Gwillim Law (2005-04-15): -# Risto O. Nykänen wrote me that Haiti is now on DST. -# I searched for confirmation, and I found a press release -# on the Web page of the Haitian Consulate in Chicago (2005-03-31), -# . Translated from French, it says: -# -# "The Prime Minister's Communication Office notifies the public in general -# and the press in particular that, following a decision of the Interior -# Ministry and the Territorial Collectivities [I suppose that means the -# provinces], Haiti will move to Eastern Daylight Time in the night from next -# Saturday the 2nd to Sunday the 3rd. -# -# "Consequently, the Prime Minister's Communication Office wishes to inform -# the population that the country's clocks will be set forward one hour -# starting at midnight. This provision will hold until the last Saturday in -# October 2005. -# -# "Port-au-Prince, March 31, 2005" -# -# From Steffen Thorsen (2006-04-04): -# I have been informed by users that Haiti observes DST this year like -# last year, so the current "only" rule for 2005 might be changed to a -# "max" rule or to last until 2006. (Who knows if they will observe DST -# next year or if they will extend their DST like US/Canada next year). -# -# I have found this article about it (in French): -# http://www.haitipressnetwork.com/news.cfm?articleID=7612 -# -# The reason seems to be an energy crisis. - -# From Stephen Colebourne (2007-02-22): -# Some IATA info: Haiti won't be having DST in 2007. - -# From Steffen Thorsen (2012-03-11): -# According to several news sources, Haiti will observe DST this year, -# apparently using the same start and end date as USA/Canada. -# So this means they have already changed their time. -# -# http://www.alterpresse.org/spip.php?article12510 -# http://radiovision2000haiti.net/home/?p=13253 -# -# From Arthur David Olson (2012-03-11): -# The alterpresse.org source seems to show a US-style leap from 2:00 a.m. to -# 3:00 a.m. rather than the traditional Haitian jump at midnight. -# Assume a US-style fall back as well. - -# From Steffen Thorsen (2013-03-10): -# It appears that Haiti is observing DST this year as well, same rules -# as US/Canada. They did it last year as well, and it looks like they -# are going to observe DST every year now... -# -# http://radiovision2000haiti.net/public/haiti-avis-changement-dheure-dimanche/ -# http://www.canalplushaiti.net/?p=6714 - -# From Steffen Thorsen (2016-03-12): -# Jean Antoine, editor of www.haiti-reference.com informed us that Haiti -# are not going on DST this year. Several other resources confirm this: ... -# https://www.radiotelevisioncaraibes.com/presse/heure_d_t_pas_de_changement_d_heure_pr_vu_pour_cet_ann_e.html -# https://www.vantbefinfo.com/changement-dheure-pas-pour-haiti/ -# http://news.anmwe.com/haiti-lheure-nationale-ne-sera-ni-avancee-ni-reculee-cette-annee/ - -# From Steffen Thorsen (2017-03-12): -# We have received 4 mails from different people telling that Haiti -# has started DST again today, and this source seems to confirm that, -# I have not been able to find a more authoritative source: -# https://www.haitilibre.com/en/news-20319-haiti-notices-time-change-in-haiti.html - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Haiti 1983 only - May 8 0:00 1:00 D -Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D -Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S -# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. -# Go with IATA. -Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D -Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S -Rule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D -Rule Haiti 2005 2006 - Oct lastSun 0:00 0 S -Rule Haiti 2012 2015 - Mar Sun>=8 2:00 1:00 D -Rule Haiti 2012 2015 - Nov Sun>=1 2:00 0 S -Rule Haiti 2017 max - Mar Sun>=8 2:00 1:00 D -Rule Haiti 2017 max - Nov Sun>=1 2:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Port-au-Prince -4:49:20 - LMT 1890 - -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT - -5:00 Haiti E%sT - -# Honduras -# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1. - -# From Paul Eggert (2006-05-05): -# worldtimezone.com reports a 2006-05-02 Spanish-language AP article -# saying Honduras will start using DST midnight Saturday, effective 4 -# months until September. La Tribuna reported today -# that Manuel Zelaya, the president -# of Honduras, refused to back down on this. - -# From Jesper Nørgaard Welen (2006-08-08): -# It seems that Honduras has returned from DST to standard time this Monday at -# 00:00 hours (prolonging Sunday to 25 hours duration). -# http://www.worldtimezone.com/dst_news/dst_news_honduras04.html - -# From Paul Eggert (2006-08-08): -# Also see Diario El Heraldo, The country returns to standard time (2006-08-08). -# http://www.elheraldo.hn/nota.php?nid=54941&sec=12 -# It mentions executive decree 18-2006. - -# From Steffen Thorsen (2006-08-17): -# Honduras will observe DST from 2007 to 2009, exact dates are not -# published, I have located this authoritative source: -# http://www.presidencia.gob.hn/noticia.aspx?nId=47 - -# From Steffen Thorsen (2007-03-30): -# http://www.laprensahn.com/pais_nota.php?id04962=7386 -# So it seems that Honduras will not enter DST this year.... - -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Hond 1987 1988 - May Sun>=1 0:00 1:00 D -Rule Hond 1987 1988 - Sep lastSun 0:00 0 S -Rule Hond 2006 only - May Sun>=1 0:00 1:00 D -Rule Hond 2006 only - Aug Mon>=1 0:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr - -6:00 Hond C%sT -# -# Great Swan I ceded by US to Honduras in 1972 - -# Jamaica -# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an -# unspecified official document, and says "This time is used throughout the -# island". Go with Milne. Round to the nearest second as required by zic. -# -# Shanks & Pottenger give April 28 for the 1974 spring-forward transition, but -# Lance Neita writes that Prime Minister Michael Manley decreed it January 5. -# Assume Neita meant Jan 6 02:00, the same as the US. Neita also writes that -# Manley's supporters associated this act with Manley's nickname "Joshua" -# (recall that in the Bible the sun stood still at Joshua's request), -# and with the Rod of Correction which Manley said he had received from -# Haile Selassie, Emperor of Ethiopia. See: -# Neita L. The politician in all of us. Jamaica Observer 2014-09-20 -# http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647 -# -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston - -5:07:10 - KMT 1912 Feb # Kingston Mean Time - -5:00 - EST 1974 - -5:00 US E%sT 1984 - -5:00 - EST - -# Martinique -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France - -4:04:20 - FFMT 1911 May # Fort-de-France MT - -4:00 - AST 1980 Apr 6 - -4:00 1:00 ADT 1980 Sep 28 - -4:00 - AST - -# Montserrat -# See America/Port_of_Spain. - -# Nicaragua -# -# This uses Shanks & Pottenger for times before 2005. -# -# From Steffen Thorsen (2005-04-12): -# I've got reports from 8 different people that Nicaragua just started -# DST on Sunday 2005-04-10, in order to save energy because of -# expensive petroleum. The exact end date for DST is not yet -# announced, only "September" but some sites also say "mid-September". -# Some background information is available on the President's official site: -# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%20Prensa/Presidente/2005/ABRIL/Gobierno-de-nicaragua-adelanta-hora-oficial-06abril.htm -# The Decree, no 23-2005 is available here: -# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-2005%20Se%20adelanta%20en%20una%20hora%20en%20todo%20el%20territorio%20nacional%20apartir%20de%20las%2024horas%20del%2009%20de%20Abril.pdf -# -# From Paul Eggert (2005-05-01): -# The decree doesn't say anything about daylight saving, but for now let's -# assume that it is daylight saving.... -# -# From Gwillim Law (2005-04-21): -# The Associated Press story on the time change, which can be found at -# http://www.lapalmainteractivo.com/guias/content/gen/ap/America_Latina/AMC_GEN_NICARAGUA_HORA.html -# and elsewhere, says (fifth paragraph, translated from Spanish): "The last -# time that a change of clocks was applied to save energy was in the year 2000 -# during the Arnoldo Alemán administration."... -# The northamerica file says that Nicaragua has been on UTC-6 continuously -# since December 1998. I wasn't able to find any details of Nicaraguan time -# changes in 2000. Perhaps a note could be added to the northamerica file, to -# the effect that we have indirect evidence that DST was observed in 2000. -# -# From Jesper Nørgaard Welen (2005-11-02): -# Nicaragua left DST the 2005-10-02 at 00:00 (local time). -# http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicados/2005/septiembre/26septiembre-cambio-hora.htm -# (2005-09-26) -# -# From Jesper Nørgaard Welen (2006-05-05): -# http://www.elnuevodiario.com.ni/2006/05/01/nacionales/18410 -# (my informal translation) -# By order of the president of the republic, Enrique Bolaños, Nicaragua -# advanced by sixty minutes their official time, yesterday at 2 in the -# morning, and will stay that way until 30th of September. -# -# From Jesper Nørgaard Welen (2006-09-30): -# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2006/D-063-2006P-PRN-Cambio-Hora.pdf -# My informal translation runs: -# The natural sun time is restored in all the national territory, in that the -# time is returned one hour at 01:00 am of October 1 of 2006. -# -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D -Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S -Rule Nic 2005 only - Apr 10 0:00 1:00 D -Rule Nic 2005 only - Oct Sun>=1 0:00 0 S -Rule Nic 2006 only - Apr 30 2:00 1:00 D -Rule Nic 2006 only - Oct Sun>=1 1:00 0 S -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Managua -5:45:08 - LMT 1890 - -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? - -6:00 - CST 1973 May - -5:00 - EST 1975 Feb 16 - -6:00 Nic C%sT 1992 Jan 1 4:00 - -5:00 - EST 1992 Sep 24 - -6:00 - CST 1993 - -5:00 - EST 1997 - -6:00 Nic C%sT - -# Panama -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Panama -5:18:08 - LMT 1890 - -5:19:36 - CMT 1908 Apr 22 # Colón Mean Time - -5:00 - EST -Link America/Panama America/Cayman - -# Puerto Rico -# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'. -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan - -4:00 - AST 1942 May 3 - -4:00 US A%sT 1946 - -4:00 - AST - -# St Kitts-Nevis -# St Lucia -# See America/Port_of_Spain. - -# St Pierre and Miquelon -# There are too many St Pierres elsewhere, so we'll use 'Miquelon'. -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre - -4:00 - AST 1980 May - -3:00 - -03 1987 - -3:00 Canada -03/-02 - -# St Vincent and the Grenadines -# See America/Port_of_Spain. - -# Turks and Caicos -# -# From Chris Dunn in -# https://bugs.debian.org/415007 -# (2007-03-15): In the Turks & Caicos Islands (America/Grand_Turk) the -# daylight saving dates for time changes have been adjusted to match -# the recent U.S. change of dates. -# -# From Brian Inglis (2007-04-28): -# http://www.turksandcaicos.tc/calendar/index.htm [2007-04-26] -# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three -# rows before that there is an out of date entry for Oct: -# "Eastern Standard Times Begins 2007 -# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time" -# indicating that the normal ET rules are followed. -# -# From Paul Eggert (2014-08-19): -# The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See: -# http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm -# Model this as a switch from EST/EDT to AST ... -# From Chris Walton (2014-11-04): -# ... the TCI government appears to have delayed the switch to -# "permanent daylight saving time" by one year.... -# http://tcweeklynews.com/time-change-to-go-ahead-this-november-p5437-127.htm -# -# From the Turks & Caicos Cabinet (2017-07-20), heads-up from Steffen Thorsen: -# ... agreed to the reintroduction in TCI of Daylight Saving Time (DST) -# during the summer months and Standard Time, also known as Local -# Time, during the winter months with effect from April 2018 ... -# https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3 -# -# From Paul Eggert (2017-08-26): -# The date of effect of the spring 2018 change appears to be March 11, -# which makes more sense. See: Hamilton D. Time change back -# by March 2018 for TCI. Magnetic Media. 2017-08-25. -# http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/ -# -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Grand_Turk -4:44:32 - LMT 1890 - -5:07:10 - KMT 1912 Feb # Kingston Mean Time - -5:00 - EST 1979 - -5:00 US E%sT 2015 Nov Sun>=1 2:00 - -4:00 - AST 2018 Mar 11 3:00 - -5:00 US E%sT - -# British Virgin Is -# Virgin Is -# See America/Port_of_Spain. - - -# Local Variables: -# coding: utf-8 -# End: