0N/A# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A# This code is free software; you can redistribute it
and/or modify it
0N/A# under the terms of the GNU General Public License version 2 only, as
2362N/A# published by the Free Software Foundation. Oracle designates this
0N/A# particular file as subject to the "Classpath" exception as provided
2362N/A# by Oracle in the LICENSE file that accompanied this code.
0N/A# This code is distributed in the hope that it will be useful, but WITHOUT
0N/A# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A# version 2 for more details (a copy is included in the LICENSE file that
0N/A# accompanied this code).
0N/A# You should have received a copy of the GNU General Public License version
0N/A# 2 along with this work; if not, write to the Free Software Foundation,
0N/A# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
2362N/A# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1627N/A# This file is in the public domain, so clarified as of
1627N/A# 2009-05-17 by Arthur David Olson.
0N/A# also includes Central America and the Caribbean
0N/A# This data is by no means authoritative; if you think you know better,
0N/A# go ahead and edit the file (and please send any changes to
0N/A# tz@elsie.nci.nih.gov for general use in the future).
0N/A# From Paul Eggert (1999-03-22):
0N/A# A reliable and entertaining source about time zones is
0N/A# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
0N/A###############################################################################
0N/A# From Paul Eggert (1999-03-31):
0N/A# Howse writes (pp 121-125) that time zones were invented by
0N/A# Professor Charles Ferdinand Dowd (1825-1904),
0N/A# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
0N/A# His pamphlet ``A System of National Time for Railroads'' (1870)
0N/A# was the result of his proposals at the Convention of Railroad Trunk Lines
0N/A# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
0N/A# but in 1872-05 he moved the proposed origin to Greenwich.
0N/A# His proposal was adopted by the railroads on 1883-11-18 at 12:00,
0N/A# and the most of the country soon followed suit.
0N/A# From Paul Eggert (2005-04-16):
0N/A# That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
0N/A# See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
0N/A# From Paul Eggert (2006-03-22):
0N/A# A good source for time zone historical data in the US is
0N/A# Thomas G. Shanks, The American Atlas (5th edition),
0N/A# San Diego: ACS Publications, Inc. (1991).
0N/A# Make sure you have the errata sheet; the book is somewhat useless without it.
0N/A# It is the source for most of the pre-1991 US entries below.
0N/A# From Paul Eggert (2001-03-06):
0N/A# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
0N/A# in his whimsical essay ``An Economical Project for Diminishing the Cost
0N/A# of Light'' published in the Journal de Paris (1784-04-26).
0N/A# Not everyone is happy with the results:
0N/A# I don't really care how time is reckoned so long as there is some
0N/A# agreement about it, but I object to being told that I am saving
0N/A# daylight when my reason tells me that I am doing nothing of the kind.
0N/A# I even object to the implication that I am wasting something
0N/A# valuable if I stay in bed after the sun has risen. As an admirer
0N/A# of moonlight I resent the bossy insistence of those who want to
0N/A# reduce my time for enjoying it. At the back of the Daylight Saving
0N/A# scheme I detect the bony, blue-fingered hand of Puritanism, eager
0N/A# to push people into bed earlier, and get them up earlier, to make
0N/A# them healthy, wealthy and wise in spite of themselves.
0N/A# -- Robertson Davies, The diary of Samuel Marchbanks,
0N/A# Clarke, Irwin (1947), XIX, Sunday
0N/A# For more about the first ten years of DST in the United States, see
0N/A# Ten years of daylight saving from the Pittsburgh standpoint
0N/A# (Carnegie Library of Pittsburgh, 1927)</a>.
0N/A# Shanks says that DST was called "War Time" in the US in 1918 and 1919.
0N/A# However, DST was imposed by the Standard Time Act of 1918, which
0N/A# was the first nationwide legal time standard, and apparently
0N/A# time was just called "Standard Time" or "Daylight Saving Time".
0N/A# From Arthur David Olson:
0N/A# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
0N/A# See, for example, the front page of the Saturday, 1974-10-26
0N/A# and Sunday, 1974-10-27 editions of the Washington Post.
0N/A# From Arthur David Olson:
0N/A# Before the Uniform Time Act of 1966 took effect in 1967, observance of
0N/A# Daylight Saving Time in the US was by local option, except during wartime.
0N/A# From Arthur David Olson (2000-09-25):
0N/A# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
0N/A# In the introduction, Oboler spoke of "Eastern Peace Time."
0N/A# An AltaVista search turned up
0N/A# "When the time is announced over the radio now, it is 'Eastern Peace
0N/A# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
0N/A# </a> (August 1945) by way of confirmation.
0N/A# From Joseph Gallant citing
0N/A# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
0N/A# At 7
P.M. (Eastern War Time) [on 1945-08-14], the networks were set
0N/A# to switch to London for Attlee's address, but the American people
0N/A# never got to hear his speech live. According to one press account,
0N/A# CBS' Bob Trout was first to announce the word of Japan's surrender,
0N/A# but a few seconds later, NBC, ABC and Mutual also flashed the word
0N/A# of surrender, all of whom interrupting the bells of Big Ben in
0N/A# London which were to precede Mr. Attlee's speech.
0N/A# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
0N/A# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
0N/A# ... a war-weary
U.S. clung to radios, awaiting word of Japan's surrender.
0N/A# Any announcement from Asia would reach St. John's New York newsroom on a
0N/A# wire service teletype machine, which had prescribed signals for major news.
0N/A# Associated Press, for example, would ring five bells before spewing out
0N/A# typed copy of an important story, and 10 bells for news "of transcendental
0N/A# On Aug. 14, stalling while talking steadily into the NBC networks' open
0N/A# microphone, St. John heard five bells and waited only to hear a sixth bell,
0N/A# before announcing confidently: "Ladies and gentlemen, World War II is over.
0N/A# The Japanese have agreed to our surrender terms."
0N/A# He had scored a 20-second scoop on other broadcasters.
0N/A# From Arthur David Olson (2005-08-22):
0N/A# Paul has been careful to use the "US" rules only in those locations
0N/A# that are part of the United States; this reflects the real scope of
0N/A#
U.S. government action. So even though the "US" rules have changed
0N/A# in the latest release, other countries won't be affected.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule US 1918 1919 - Mar lastSun 2:00 1:00 D
0N/ARule US 1918 1919 - Oct lastSun 2:00 0 S
0N/ARule US 1942 only - Feb 9 2:00 1:00 W # War
0N/ARule US 1945 only - Aug 14 23:00u 1:00 P # Peace
0N/ARule US 1945 only - Sep 30 2:00 0 S
0N/ARule US 1967 2006 - Oct lastSun 2:00 0 S
0N/ARule US 1967 1973 - Apr lastSun 2:00 1:00 D
0N/ARule US 1974 only - Jan 6 2:00 1:00 D
0N/ARule US 1975 only - Feb 23 2:00 1:00 D
0N/ARule US 1976 1986 - Apr lastSun 2:00 1:00 D
0N/ARule US 1987 2006 - Apr Sun>=1 2:00 1:00 D
0N/ARule US 2007 max - Mar Sun>=8 2:00 1:00 D
0N/ARule US 2007 max - Nov Sun>=1 2:00 0 S
0N/A# From Arthur David Olson, 2005-12-19
0N/A# We generate the files specified below to guard against old files with
0N/A# obsolete information being left in the time zone binary directory.
0N/A# We limit the list to names that have appeared in previous versions of
0N/A# this time zone package.
0N/A# We do these as separate Zones rather than as Links to avoid problems if
0N/A# a particular place changes whether it observes DST.
0N/A# We put these specifications here in the northamerica file both to
0N/A# increase the chances that they'll actually get compiled and to
0N/A# avoid the need to duplicate the US rules in another file.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/AZone HST -10:00 - HST
0N/AZone EST5EDT -5:00 US E%sT
0N/AZone CST6CDT -6:00 US C%sT
0N/AZone MST7MDT -7:00 US M%sT
0N/AZone PST8PDT -8:00 US P%sT
0N/A# From Bob Devine (1988-01-28):
0N/A#
...Alaska (and Hawaii) had the timezone names changed in 1967.
0N/A# Pacific Standard Time(PST) -same-
0N/A# Yukon Standard Time(YST) -same-
0N/A# Central Alaska
S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
0N/A# Nome Standard Time (NT) Bering Standard Time (BST)
0N/A#
...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
0N/A# The YST zone now covers nearly all of the state, AHST just part
0N/A# of the Aleutian islands. No DST.
0N/A# From Paul Eggert (1995-12-19):
0N/A# The tables below use `NST', not `NT', for Nome Standard Time.
0N/A# I invented `CAWT' for Central Alaska War Time.
0N/A# From U. S. Naval Observatory (1989-01-19):
0N/A# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
0N/A# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
0N/A# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
0N/A# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
0N/A# USA MOUNTAIN 7 H BEHIND UTC DENVER
0N/A# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
0N/A# USA PACIFIC 8 H BEHIND UTC
L.A., SAN FRANCISCO
0N/A# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
0N/A# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
0N/A# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
0N/A# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
0N/A# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
0N/A# USA HAWAII 10 H BEHIND UTC
0N/A# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
0N/A# From Arthur David Olson (1989-01-21):
0N/A# The above dates are for 1988.
0N/A# Note the "AKST" and "AKDT" abbreviations, the claim that there's
0N/A# no DST in Samoa, and the claim that there is DST in Alaska and the
0N/A# From Arthur David Olson (1988-02-13):
0N/A# Legal standard time zone names, from United States Code (1982 Edition and
0N/A# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
0N/A# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
0N/A# took effect), as explained in sections 263 and 261:
0N/A# United States standard eastern time
0N/A# United States standard mountain time
0N/A# United States standard central time
0N/A# United States standard Pacific time
0N/A# United States standard Alaska time
0N/A# Next, names from 1967-04-01 until 1983-11-30 (the date for
0N/A# public law 98-181):
0N/A# Atlantic standard time
0N/A# eastern standard time
0N/A# central standard time
0N/A# mountain standard time
0N/A# Pacific standard time
0N/A# Yukon standard time
0N/A# Alaska-Hawaii standard time
0N/A# Bering standard time
0N/A# And after 1983-11-30:
0N/A# Atlantic standard time
0N/A# eastern standard time
0N/A# central standard time
0N/A# mountain standard time
0N/A# Pacific standard time
0N/A# Alaska standard time
0N/A# Hawaii-Aleutian standard time
0N/A# Samoa standard time
0N/A# The law doesn't give abbreviations.
0N/A# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
0N/A# Public law 106-564 (2000-12-23) introduced the abbreviation
0N/A# "Chamorro Standard Time" for time in Guam and the Northern Marianas.
0N/A# See the file "australasia".
0N/A# From Arthur David Olson, 2005-08-09
0N/A# The following was signed into law on 2005-08-08.
0N/A#
H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
0N/A# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15
0N/A# (1) by striking `first Sunday of April' and inserting `second
0N/A# Sunday of March'; and
0N/A# (2) by striking `last Sunday of October' and inserting `first
0N/A# Sunday of November'.
0N/A# (b) Effective Date- Subsection (a) shall take effect 1 year after the
0N/A# date of enactment of this Act or March 1, 2007, whichever is later.
0N/A# (c) Report to Congress- Not later than 9 months after the effective
0N/A# date stated in subsection (b), the Secretary shall report to Congress
0N/A# on the impact of this section on energy consumption in the United
0N/A# (d) Right to Revert- Congress retains the right to revert the
0N/A# Daylight Saving Time back to the 2005 time schedules once the
0N/A# Department study is complete.
0N/A# US eastern time, represented by New York
0N/A# Connecticut, Delaware, District of Columbia, most of Florida,
0N/A# Georgia, southeast Indiana (Dearborn and Ohio counties), eastern Kentucky
0N/A# New Hampshire, New Jersey, New York, North Carolina, Ohio,
0N/A# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
0N/A# Vermont, Virginia, West Virginia
0N/A# From Dave Cantor (2004-11-02):
0N/A# Early this summer I had the occasion to visit the Mount Washington
0N/A# Observatory weather station atop (of course!) Mount Washington [, NH]....
0N/A# One of the staff members said that the station was on Eastern Standard Time
0N/A# and didn't change their clocks for Daylight Saving ... so that their
0N/A# reports will always have times which are 5 hours behind UTC.
0N/A# From Paul Eggert (2005-08-26):
0N/A# According to today's Huntsville Times
0N/A# a few towns on Alabama's "eastern border with Georgia, such as Phenix City
0N/A# in Russell County, Lanett in Chambers County and some towns in Lee County,
0N/A# set their watches and clocks on Eastern time." It quotes
H.H. "Bubba"
0N/A# Roberts, city administrator in Phenix City. as saying "We are in the Central
0N/A# time zone, but we do go by the Eastern time zone because so many people work
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule NYC 1920 only - Mar lastSun 2:00 1:00 D
0N/ARule NYC 1920 only - Oct lastSun 2:00 0 S
0N/ARule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
0N/ARule NYC 1921 1954 - Sep lastSun 2:00 0 S
0N/ARule NYC 1955 1966 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# US central time, represented by Chicago
0N/A# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
0N/A# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
0N/A# Washington counties), Illinois, western Indiana
0N/A# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
0N/A# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
0N/A# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
0N/A# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
0N/A# western Tennessee, most of Texas, Wisconsin
0N/A# From Larry M. Smith (2006-04-26) re Wisconsin:
0N/A# is currently enforced at the 01:00 time of change. Because the local
0N/A# "bar time" in the state corresponds to 02:00, a number of citations
0N/A# are issued for the "sale of class 'B' alcohol after prohibited
0N/A# hours" within the deviated hour of this change every year....
0N/A# From Douglas R. Bomberg (2007-03-12):
0N/A# Wisconsin has enacted (nearly eleventh-hour) legislation to get WI
0N/A# Statue 175 closer in synch with the US Congress' intent....
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Chicago 1920 only - Jun 13 2:00 1:00 D
0N/ARule Chicago 1920 1921 - Oct lastSun 2:00 0 S
0N/ARule Chicago 1921 only - Mar lastSun 2:00 1:00 D
0N/ARule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
0N/ARule Chicago 1922 1954 - Sep lastSun 2:00 0 S
0N/ARule Chicago 1955 1966 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 Chicago C%sT 1936 Mar 1 2:00
0N/A -5:00 - EST 1936 Nov 15 2:00
0N/A -6:00 Chicago C%sT 1942
0N/A -6:00 Chicago C%sT 1967
0N/A# Oliver County, ND switched from mountain to central time on 1992-10-25.
0N/A -7:00 US M%sT 1992 Oct 25 02:00
0N/A# Morton County, ND, switched from mountain to central time on
0N/A# 2003-10-26, except for the area around Mandan which was already central time.
0N/A# Officially this switch also included part of Sioux County, and
0N/A# Jones, Mellette, and Todd Counties in South Dakota;
0N/A# but in practice these other counties were already observing central time.
0N/A -7:00 US M%sT 2003 Oct 26 02:00
0N/A# US mountain time, represented by Denver
0N/A# Colorado, far western Kansas, Montana, western
0N/A# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
0N/A# New Mexico, southwestern North Dakota,
0N/A# western South Dakota, far western Texas (El Paso County, Hudspeth County,
0N/A# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
0N/ARule Denver 1920 only - Oct lastSun 2:00 0 S
0N/ARule Denver 1921 only - May 22 2:00 0 S
0N/ARule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
0N/ARule Denver 1965 1966 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -7:00 Denver M%sT 1942
0N/A -7:00 Denver M%sT 1967
0N/A# US Pacific time, represented by Los Angeles
0N/A# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
0N/A# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties,
0N/A# and the northern three-quarters of Idaho county),
0N/A# most of Nevada, most of Oregon, and Washington
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule CA 1948 only - Mar 14 2:00 1:00 D
0N/ARule CA 1949 only - Jan 1 2:00 0 S
0N/ARule CA 1950 1966 - Apr lastSun 2:00 1:00 D
0N/ARule CA 1950 1961 - Sep lastSun 2:00 0 S
0N/ARule CA 1962 1966 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# AK%sT is the modern abbreviation for -9:00 per USNO.
0N/A# From Paul Eggert (2001-05-30):
0N/A# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
0N/A# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
0N/A# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
0N/A# also a Friday. Include only the time zone part of this transition,
0N/A# ignoring the switch from Julian to Gregorian, since we can't represent
0N/A# the Julian calendar.
0N/A# As far as we know, none of the exact locations mentioned below were
0N/A# permanently inhabited in 1867 by anyone using either calendar.
0N/A# (Yakutat was colonized by the Russians in 1799, but the settlement
0N/A# was destroyed in 1805 by a Yakutat-kon war party.) However, there
0N/A# were nearby inhabitants in some cases and for our purposes perhaps
0N/A# it's best to simply use the official transition.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -8:57:41 - LMT 1900 Aug 20 12:00
0N/A -8:00 US P%sT 1983 Oct 30 2:00
0N/A -9:00 US Y%sT 1983 Nov 30
0N/A -9:18:55 - LMT 1900 Aug 20 12:00
0N/A -9:00 US Y%sT 1983 Nov 30
0N/A -9:59:36 - LMT 1900 Aug 20 12:00
0N/A -10:00 - CAT 1967 Apr
0N/A -10:00 US AH%sT 1983 Oct 30 2:00
0N/A -9:00 US Y%sT 1983 Nov 30
0N/A -11:01:38 - LMT 1900 Aug 20 12:00
0N/A -11:00 - NST 1967 Apr
0N/A -11:00 US B%sT 1983 Oct 30 2:00
0N/A -9:00 US Y%sT 1983 Nov 30
0N/A -11:46:38 - LMT 1900 Aug 20 12:00
0N/A -11:00 - NST 1967 Apr
0N/A -11:00 US B%sT 1983 Oct 30 2:00
0N/A -10:00 US AH%sT 1983 Nov 30
0N/A# The following switches don't quite make our 1970 cutoff.
0N/A# Shanks writes that part of southwest Alaska (
e.g. Aniak)
0N/A# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
0N/A# and another part (
e.g. Akiak) made the same switch five weeks later.
0N/A# From David Flater (2004-11-09):
0N/A# Historic Preservation Commission, provided this information, which
0N/A# suggests that Unalaska deviated from statutory time from early 1967
0N/A# possibly until 1983:
0N/A# Minutes of the Unalaska City Council Meeting, January 10, 1967:
0N/A# "Except for St. Paul and Akutan, Unalaska is the only important
0N/A# location not on Alaska Standard Time. The following resolution was
0N/A# made by William Robinson and seconded by Henry Swanson: Be it
0N/A# resolved that the City of Unalaska hereby goes to Alaska Standard
0N/A# Time as of midnight Friday, January 13, 1967 (1
A.M. Saturday,
0N/A# January 14, Alaska Standard Time.) This resolution was passed with
0N/A# three votes for and one against."
0N/A# From Arthur David Olson:
0N/A# And then there's Hawaii.
0N/A# DST was observed for one day in 1933;
0N/A# standard time was changed by half an hour in 1947;
0N/A# it's always standard as of 1986.
0N/A# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
0N/A -10:30 - HST 1933 Apr 30 2:00
0N/A -10:30 1:00 HDT 1933 May 21 2:00
0N/A -10:30 US H%sT 1947 Jun 8 2:00
0N/A# Now we turn to US areas that have diverged from the consensus since 1970.
0N/A# Arizona mostly uses MST.
0N/A# From Paul Eggert (2002-10-20):
0N/A# The information in the rest of this paragraph is derived from the
0N/A# Daylight Saving Time web page (2002-01-23)</a> maintained by the
0N/A# Arizona State Library, Archives and Public Records.
0N/A# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
0N/A# time, but by federal law railroads, airlines, bus lines, military
0N/A# personnel, and some engaged in interstate commerce continued to
0N/A# observe war (
i.e., daylight saving) time. The 1944-03-17 Phoenix
0N/A# Gazette says that was the date the law changed, and that 04-01 was
0N/A# the date the state's clocks would change. In 1945 the State of
0N/A# Arizona used standard time all year, again with exceptions only as
0N/A# mandated by federal law. Arizona observed DST in 1967, but Arizona
0N/A# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
0N/A# Shanks says the 1944 experiment came to an end on 1944-03-17.
0N/A# Go with the Arizona State Library instead.
0N/A -7:00 US M%sT 1944 Jan 1 00:01
0N/A -7:00 - MST 1944 Apr 1 00:01
0N/A -7:00 US M%sT 1944 Oct 1 00:01
0N/A -7:00 US M%sT 1968 Mar 21
0N/A# From Arthur David Olson (1988-02-13):
0N/A# A writer from the Inter Tribal Council of Arizona, Inc.,
0N/A# notes in private correspondence dated 1987-12-28 that "Presently, only the
0N/A# Navajo Nation participates in the Daylight Saving Time policy, due to its
0N/A# large size and location in three states." (The "only" means that other
0N/A# tribal nations don't use DST.)
0N/A# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
0N/A# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
0N/A# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
0N/A# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
0N/A# Teton, Twin Falls, Valley, Washington counties, and the southern
0N/A# quarter of Idaho county) and eastern Oregon (most of Malheur County)
0N/A# switched four weeks late in 1974.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -8:00 US P%sT 1923 May 13 2:00
0N/A -7:00 - MST 1974 Feb 3 2:00
0N/A# For a map of Indiana's time zone regions, see:
0N/A# What time is it in Indiana?
0N/A# From Paul Eggert (2007-08-17):
0N/A# with the following exceptions:
0N/A# - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
0N/A# - Clark, Floyd, and Harrison counties have been like
0N/A# - Crawford, Daviess, Dubois, Knox, Martin, Perry, Pike, Pulaski, Starke,
0N/A# and Switzerland counties have their own time zone histories as noted below.
0N/A# Shanks partitioned Indiana into 345 regions, each with its own time history,
0N/A# and wrote ``Even newspaper reports present contradictory information.''
0N/A# Those Hoosiers! Such a flighty and changeable people!
0N/A# Fortunately, most of the complexity occurred before our cutoff date of 1970.
0N/A# Other than Indianapolis, the Indiana place names are so nondescript
0N/A# that they would be ambiguous if we left them at the `America' level.
0N/A# From Paul Eggert (2005-08-16):
0N/A# From Nathan Stratton Treadway (2006-03-30):
0N/A# From Deborah Goldsmith (2006-01-18):
0N/A# From Paul Eggert (2006-01-20):
0N/A# It says "DOT is relocating the time zone boundary in Indiana to move Starke,
0N/A# Pulaski, Knox, Daviess, Martin, Pike, Dubois, and Perry Counties from the
0N/A# Eastern Time Zone to the Central Time Zone.... The effective date of
0N/A# this rule is 2:OO
a.m. EST Sunday, April 2, 2006, which is the
0N/A# changeover date from standard time to Daylight Saving Time."
0N/A# Strictly speaking, this means the affected counties will change their
0N/A# clocks twice that night, but this obviously is in error. The intent
0N/A# is that 01:59:59 EST be followed by 02:00:00 CDT.
0N/A# From Gwillim Law (2007-02-10):
0N/A# The Associated Press has been reporting that Pulaski County, Indiana is
0N/A# going to switch from Central to Eastern Time on March 11, 2007....
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Indianapolis 1941 only - Jun 22 2:00 1:00 D
0N/ARule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
0N/ARule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 Indianapolis C%sT 1942
0N/A -6:00 Indianapolis C%sT 1955 Apr 24 2:00
0N/A -5:00 - EST 1957 Sep 29 2:00
0N/A -6:00 - CST 1958 Apr 27 2:00
0N/A# Eastern Crawford County, Indiana, left its clocks alone in 1974,
0N/A# as well as from 1976 through 2005.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Marengo 1951 only - Apr lastSun 2:00 1:00 D
0N/ARule Marengo 1951 only - Sep lastSun 2:00 0 S
0N/ARule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
0N/ARule Marengo 1954 1960 - Sep lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 Marengo C%sT 1961 Apr 30 2:00
0N/A -5:00 US E%sT 1974 Jan 6 2:00
0N/A -6:00 1:00 CDT 1974 Oct 27 2:00
0N/A# Daviess, Dubois, Knox, and Martin Counties, Indiana,
0N/A# switched from eastern to central time in April 2006, then switched back
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Vincennes 1946 only - Apr lastSun 2:00 1:00 D
0N/ARule Vincennes 1946 only - Sep lastSun 2:00 0 S
0N/ARule Vincennes 1953 1954 - Apr lastSun 2:00 1:00 D
0N/ARule Vincennes 1953 1959 - Sep lastSun 2:00 0 S
0N/ARule Vincennes 1955 only - May 1 0:00 1:00 D
0N/ARule Vincennes 1956 1963 - Apr lastSun 2:00 1:00 D
0N/ARule Vincennes 1960 only - Oct lastSun 2:00 0 S
0N/ARule Vincennes 1961 only - Sep lastSun 2:00 0 S
0N/ARule Vincennes 1962 1963 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 Vincennes C%sT 1964 Apr 26 2:00
0N/A -5:00 - EST 2006 Apr 2 2:00
0N/A -6:00 US C%sT 2007 Nov 4 2:00
0N/A# Perry County, Indiana, switched from eastern to central time in April 2006.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Perry 1946 only - Apr lastSun 2:00 1:00 D
0N/ARule Perry 1946 only - Sep lastSun 2:00 0 S
0N/ARule Perry 1953 1954 - Apr lastSun 2:00 1:00 D
0N/ARule Perry 1953 1959 - Sep lastSun 2:00 0 S
0N/ARule Perry 1955 only - May 1 0:00 1:00 D
0N/ARule Perry 1956 1963 - Apr lastSun 2:00 1:00 D
0N/ARule Perry 1960 only - Oct lastSun 2:00 0 S
0N/ARule Perry 1961 only - Sep lastSun 2:00 0 S
0N/ARule Perry 1962 1963 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 Perry C%sT 1964 Apr 26 2:00
0N/A -5:00 - EST 2006 Apr 2 2:00
0N/A# Pike County, Indiana moved from central to eastern time in 1977,
0N/A# then switched back in 2006, then switched back again in 2007.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Pike 1955 only - May 1 0:00 1:00 D
0N/ARule Pike 1955 1960 - Sep lastSun 2:00 0 S
0N/ARule Pike 1956 1964 - Apr lastSun 2:00 1:00 D
0N/ARule Pike 1961 1964 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 Pike C%sT 1965 Apr 25 2:00
0N/A -5:00 - EST 1966 Oct 30 2:00
0N/A -6:00 US C%sT 1977 Oct 30 2:00
0N/A -5:00 - EST 2006 Apr 2 2:00
0N/A -6:00 US C%sT 2007 Nov 4 2:00
0N/A# Starke County, Indiana moved from central to eastern time in 1991,
0N/A# then switched back in 2006.
0N/A# From Arthur David Olson (1991-10-28):
0N/A# An article on page A3 of the Sunday, 1991-10-27 Washington Post
0N/A# notes that Starke County switched from Central time to Eastern time as of
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
0N/ARule Starke 1947 1954 - Sep lastSun 2:00 0 S
0N/ARule Starke 1955 1956 - Oct lastSun 2:00 0 S
0N/ARule Starke 1957 1958 - Sep lastSun 2:00 0 S
0N/ARule Starke 1959 1961 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 Starke C%sT 1962 Apr 29 2:00
0N/A -5:00 - EST 1963 Oct 27 2:00
0N/A -6:00 US C%sT 1991 Oct 27 2:00
0N/A -5:00 - EST 2006 Apr 2 2:00
0N/A# Pulaski County, Indiana, switched from eastern to central time in
0N/A# April 2006 and then switched back in March 2007.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Pulaski 1946 1960 - Apr lastSun 2:00 1:00 D
0N/ARule Pulaski 1946 1954 - Sep lastSun 2:00 0 S
0N/ARule Pulaski 1955 1956 - Oct lastSun 2:00 0 S
0N/ARule Pulaski 1957 1960 - Sep lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 Pulaski C%sT 1961 Apr 30 2:00
0N/A -5:00 - EST 2006 Apr 2 2:00
0N/A -6:00 US C%sT 2007 Mar 11 2:00
0N/A# Switzerland County, Indiana, did not observe DST from 1973 through 2005.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 US C%sT 1954 Apr 25 2:00
0N/A# Part of Kentucky left its clocks alone in 1974.
0N/A# This also includes Clark, Floyd, and Harrison counties in Indiana.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Louisville 1921 only - May 1 2:00 1:00 D
0N/ARule Louisville 1921 only - Sep 1 2:00 0 S
0N/ARule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
0N/ARule Louisville 1941 only - Sep lastSun 2:00 0 S
0N/ARule Louisville 1946 only - Jun 2 2:00 0 S
0N/ARule Louisville 1950 1955 - Sep lastSun 2:00 0 S
0N/ARule Louisville 1956 1960 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 Louisville C%sT 1942
0N/A -6:00 Louisville C%sT 1961 Jul 23 2:00
0N/A -5:00 US E%sT 1974 Jan 6 2:00
0N/A -6:00 1:00 CDT 1974 Oct 27 2:00
0N/A# Wayne County, Kentucky
0N/A# Lake Cumberland LIFE
0N/A# </a> (1999-01-29) via WKYM-101.7:
0N/A# Clinton County has joined Wayne County in asking the DoT to change from
0N/A# the Central to the Eastern time zone.... The Wayne County government made
0N/A# the same request in December. And while Russell County officials have not
0N/A# taken action, the majority of respondents to a poll conducted there in
0N/A# August indicated they would like to change to "fast time" also.
0N/A# The three Lake Cumberland counties are the farthest east of any
U.S. 0N/A# location in the Central time zone.
0N/A# From Rich Wales (2000-08-29):
0N/A# After prolonged debate, and despite continuing deep differences of opinion,
0N/A# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
0N/A# (-0500) time. They won't "fall back" this year. See Sara Shipley,
0N/A# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
0N/A# From Paul Eggert (2001-07-16):
0N/A# The final rule was published in the
0N/A# Federal Register 65, 160 (2000-08-17), page 50154-50158.
0N/A -6:00 US C%sT 2000 Oct 29 2:00
0N/A# From Rives McDow (2000-08-30):
0N/A# Here ... are all the changes in the US since 1985.
0N/A# Kearny County, KS (put all of county on central;
0N/A# previously split between MST and CST) ... 1990-10
0N/A# Starke County, IN (from CST to EST) ... 1991-10
0N/A# Oliver County, ND (from MST to CST) ... 1992-10
0N/A# West Wendover, NV (from PST TO MST) ... 1999-10
0N/A# Wayne County, KY (from CST to EST) ... 2000-10
0N/A# From Paul Eggert (2001-07-17):
0N/A# We don't know where the line used to be within Kearny County, KS,
0N/A# so omit that change for now.
0N/A# West Wendover, NV officially switched from Pacific to mountain time on
0N/A# 1999-10-31. See the
0N/A# Federal Register 64, 203 (1999-10-21), page 56705-56707.
0N/A# However, the Federal Register says that West Wendover already operated
0N/A# on mountain time, and the rule merely made this official;
0N/A# hence a separate tz entry is not needed.
0N/A# From Bob Devine (1988-01-28):
0N/A# Michigan didn't observe DST from 1968 to 1973.
0N/A# From Paul Eggert (1999-03-31):
0N/A# Shanks writes that Michigan started using standard time on 1885-09-18,
0N/A# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
0N/A# local time until 1900 when the City Council decreed that clocks should
0N/A# be put back twenty-eight minutes to Central Standard Time. Half the
0N/A# city obeyed, half refused. After considerable debate, the decision
0N/A# was rescinded and the city reverted to Sun time. A derisive offer to
0N/A# erect a sundial in front of the city hall was referred to the
0N/A# Committee on Sewers. Then, in 1905, Central time was adopted
0N/A# This story is too entertaining to be false, so go with Howse over Shanks.
0N/A# From Paul Eggert (2001-03-06):
0N/A# Garland (1927) writes ``Cleveland and Detroit advanced their clocks
0N/A# one hour in 1914.'' This change is not in Shanks. We have no more
0N/A# info, so omit this for now.
0N/A# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Detroit 1948 only - Apr lastSun 2:00 1:00 D
0N/ARule Detroit 1948 only - Sep lastSun 2:00 0 S
0N/ARule Detroit 1967 only - Jun 14 2:00 1:00 D
0N/ARule Detroit 1967 only - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 - CST 1915 May 15 2:00
0N/A -5:00 Detroit E%sT 1973
0N/A -5:00 - EST 1975 Apr 27 2:00
0N/A# Dickinson, Gogebic, Iron, and Menominee Counties, Michigan,
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
0N/ARule Menominee 1946 only - Apr lastSun 2:00 1:00 D
0N/ARule Menominee 1946 only - Sep lastSun 2:00 0 S
0N/ARule Menominee 1966 only - Apr lastSun 2:00 1:00 D
0N/ARule Menominee 1966 only - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 Menominee C%sT 1969 Apr 27 2:00
0N/A -5:00 - EST 1973 Apr 29 2:00
0N/A# administered by the US Fish and Wildlife Service
0N/A# claimed by US under the provisions of the 1856 Guano Islands Act
0N/A# also claimed by Haiti
0N/A# occupied 1857/1900 by the Navassa Phosphate Co
0N/A# US lighthouse 1917/1996-09
0N/A# currently uninhabited
0N/A# see Mark Fineman, ``An Isle Rich in Guano and Discord'',
0N/A# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
0N/A# Jimmy Skaggs, _The Great Guano Rush_ (1994).
0N/A################################################################################
0N/A# From Paul Eggert (2006-03-22):
0N/A# A good source for time zone historical data outside the
U.S. is
0N/A# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
0N/A# San Diego: ACS Publications, Inc. (2003).
0N/A# Gwillim Law writes that a good source
0N/A# for recent time zone data is the International Air Transport
0N/A# Association's Standard Schedules Information Manual (IATA SSIM),
0N/A# published semiannually. Law sent in several helpful summaries
0N/A# of the IATA's data after 1990.
0N/A# Except where otherwise noted, Shanks & Pottenger is the source for
0N/A# entries through 1990, and IATA SSIM is the source for entries afterwards.
0N/A# Other sources occasionally used include:
0N/A# Edward W. Whitman, World Time Differences,
0N/A# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
0N/A# which I found in the UCLA library.
0N/A# William Willett, The Waste of Daylight, 19th edition
0N/A# See the `europe' file for Greenland.
0N/A# From Alain LaBont<e'> (1994-11-14):
0N/A# I post here the time zone abbreviations standardized in Canada
0N/A# UTC Standard time Daylight savings time
0N/A# offset French English French English
0N/A# HN: Heure Normale ST: Standard Time
0N/A# HA: Heure Avanc<e'>e DT: Daylight saving Time
0N/A# A: de l'Atlantique Atlantic
0N/A# C: du Centre Central
0N/A# E: de l'Est Eastern
0N/A# P: du Pacifique Pacific
0N/A# From Paul Eggert (1994-11-22):
0N/A# Alas, this sort of thing must be handled by localization software.
0N/A# Unless otherwise specified, the data for Canada are all from Shanks
0N/A# From Chris Walton (2006-04-01, 2006-04-25, 2006-06-26, 2007-01-31,
0N/A# The British Columbia government announced yesterday that it will
0N/A# adjust daylight savings next year to align with changes in the
0N/A# Daylight saving time will be extended by four weeks starting in 2007....
0N/A# [For New Brunswick] the new legislation dictates that the time change is to
0N/A# be done at 02:00 instead of 00:01.
0N/A# Manitoba has traditionally changed the clock every fall at 03:00.
0N/A# As of 2006, the transition is to take place one hour earlier at 02:00.
0N/A# [Alberta, Ontario, Quebec] will follow US rules.
0N/A# Province of Newfoundland and Labrador....
0N/A#
N.W.T. will follow US rules. Whoever maintains the government web site
0N/A# does not seem to believe in bookmarks. To see the news release, click the
0N/A# following link and search for "Daylight Savings Time Change". Press the
0N/A# "Daylight Savings Time Change" link; it will fire off a popup using
0N/A# An amendment to the Interpretation Act was registered on February 19/2007....
0N/A# From Paul Eggert (2006-04-25):
0N/A# H. David Matthews and Mary Vincent's map
0N/A# "It's about TIME", _Canadian Geographic_ (September-October 1998)
0N/A# </a> contains detailed boundaries for regions observing nonstandard
0N/A# time and daylight saving time arrangements in Canada circa 1998.
0N/A# INMS, the Institute for National Measurement Standards in Ottawa, has <a
0N/A# information about standard and daylight saving time zones in Canada.
0N/A# </a> (updated periodically).
0N/A# Its unofficial information is often taken from Matthews and Vincent.
0N/A# From Paul Eggert (2006-06-27):
0N/A# For now, assume all of DST-observing Canada will fall into line with the
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Canada 1918 only - Apr 14 2:00 1:00 D
0N/ARule Canada 1918 only - Oct 31 2:00 0 S
0N/ARule Canada 1942 only - Feb 9 2:00 1:00 W # War
0N/ARule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
0N/ARule Canada 1945 only - Sep 30 2:00 0 S
0N/ARule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
0N/ARule Canada 1974 2006 - Oct lastSun 2:00 0 S
0N/ARule Canada 1987 2006 - Apr Sun>=1 2:00 1:00 D
0N/ARule Canada 2007 max - Mar Sun>=8 2:00 1:00 D
0N/ARule Canada 2007 max - Nov Sun>=1 2:00 0 S
0N/A# Newfoundland and Labrador
0N/A# From Paul Eggert (2000-10-02):
0N/A# Matthews and Vincent (1998) write that Labrador should use
NST/NDT,
0N/A# but the only part of Labrador that follows the rules is the
0N/A# southeast corner, including Port Hope Simpson and Mary's Harbour,
0N/A# but excluding, say, Black Tickle.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule StJohns 1917 only - Apr 8 2:00 1:00 D
0N/ARule StJohns 1917 only - Sep 17 2:00 0 S
0N/A# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
0N/ARule StJohns 1919 only - May 5 23:00 1:00 D
0N/ARule StJohns 1919 only - Aug 12 23:00 0 S
0N/A# For 1931-1935 Whitman gives Apr same date; go with Shanks & Pottenger.
0N/ARule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
0N/ARule StJohns 1920 1935 - Oct lastSun 23:00 0 S
0N/A# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks &
0N/ARule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
0N/ARule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
0N/A# Whitman gives the following transitions:
0N/A# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
0N/A# but go with Shanks & Pottenger and assume they used Canadian rules.
0N/A# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
0N/A# Apr 30 - Sep 24; go with Shanks & Pottenger.
0N/ARule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
0N/ARule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
0N/ARule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
0N/ARule StJohns 1951 1959 - Sep lastSun 2:00 0 S
0N/ARule StJohns 1960 1986 - Oct lastSun 2:00 0 S
0N/A# From Paul Eggert (2000-10-02):
0N/A# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
0N/A# at 00:01 local time. For now, assume it started in 1987.
0N/ARule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
0N/ARule StJohns 1987 2006 - Oct lastSun 0:01 0 S
0N/ARule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
0N/ARule StJohns 1989 2006 - Apr Sun>=1 0:01 1:00 D
0N/ARule StJohns 2007 max - Mar Sun>=8 0:01 1:00 D
0N/ARule StJohns 2007 max - Nov Sun>=1 0:01 0 S
0N/A# St John's has an apostrophe, but Posix file names can't have apostrophes.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -3:30:52 StJohns N%sT 1918
0N/A -3:30:52 Canada N%sT 1919
0N/A -3:30:52 StJohns N%sT 1935 Mar 30
0N/A -3:30 StJohns N%sT 1942 May 11
0N/A -3:30 Canada N%sT 1946
0N/A# most of east Labrador
0N/A# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -3:30:52 Canada N%sT 1919
0N/A -3:30:52 - NST 1935 Mar 30
0N/A -3:30 StJohns N%sT 1942 May 11
0N/A -3:30 Canada N%sT 1946
0N/A -3:30 StJohns N%sT 1966 Mar 15 2:00
0N/A# west Labrador, Nova Scotia, Prince Edward I
0N/A# From Paul Eggert (2006-03-22):
0N/A# Shanks & Pottenger write that since 1970 most of this region has been like
0N/A# Halifax. Many locales did not observe peacetime DST until 1972;
0N/A# Glace Bay, NS is the largest that we know of.
0N/A# Shanks & Pottenger also write that Liverpool, NS was the only town
0N/A# in Canada to observe DST in 1971 but not 1970; for now we'll assume
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Halifax 1916 only - Apr 1 0:00 1:00 D
0N/ARule Halifax 1916 only - Oct 1 0:00 0 S
0N/ARule Halifax 1920 only - May 9 0:00 1:00 D
0N/ARule Halifax 1920 only - Aug 29 0:00 0 S
0N/ARule Halifax 1921 only - May 6 0:00 1:00 D
0N/ARule Halifax 1921 1922 - Sep 5 0:00 0 S
0N/ARule Halifax 1922 only - Apr 30 0:00 1:00 D
0N/ARule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
0N/ARule Halifax 1923 only - Sep 4 0:00 0 S
0N/ARule Halifax 1924 only - Sep 15 0:00 0 S
0N/ARule Halifax 1925 only - Sep 28 0:00 0 S
0N/ARule Halifax 1926 only - May 16 0:00 1:00 D
0N/ARule Halifax 1926 only - Sep 13 0:00 0 S
0N/ARule Halifax 1927 only - May 1 0:00 1:00 D
0N/ARule Halifax 1927 only - Sep 26 0:00 0 S
0N/ARule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
0N/ARule Halifax 1928 only - Sep 9 0:00 0 S
0N/ARule Halifax 1929 only - Sep 3 0:00 0 S
0N/ARule Halifax 1930 only - Sep 15 0:00 0 S
0N/ARule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
0N/ARule Halifax 1932 only - May 1 0:00 1:00 D
0N/ARule Halifax 1933 only - Apr 30 0:00 1:00 D
0N/ARule Halifax 1933 only - Oct 2 0:00 0 S
0N/ARule Halifax 1934 only - May 20 0:00 1:00 D
0N/ARule Halifax 1934 only - Sep 16 0:00 0 S
0N/ARule Halifax 1935 only - Jun 2 0:00 1:00 D
0N/ARule Halifax 1935 only - Sep 30 0:00 0 S
0N/ARule Halifax 1936 only - Jun 1 0:00 1:00 D
0N/ARule Halifax 1936 only - Sep 14 0:00 0 S
0N/ARule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
0N/ARule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
0N/ARule Halifax 1939 only - May 28 0:00 1:00 D
0N/ARule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
0N/ARule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
0N/ARule Halifax 1946 1949 - Sep lastSun 2:00 0 S
0N/ARule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
0N/ARule Halifax 1951 1954 - Sep lastSun 2:00 0 S
0N/ARule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
0N/ARule Halifax 1956 1959 - Sep lastSun 2:00 0 S
0N/ARule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
0N/ARule Halifax 1962 1973 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -4:00 Halifax A%sT 1918
0N/A -4:00 Canada A%sT 1919
0N/A -4:00 Halifax A%sT 1942 Feb 9 2:00s
0N/A -4:00 Canada A%sT 1946
0N/A -4:00 Halifax A%sT 1974
0N/A -4:00 Canada A%sT 1953
0N/A -4:00 Halifax A%sT 1954
0N/A -4:00 Halifax A%sT 1974
0N/A# From Paul Eggert (2007-01-31):
0N/A# says they changed at 00:01 through 2006, and
0N/A# clear that this was the case since at least 1993.
0N/A# For now, assume it started in 1993.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Moncton 1933 1935 - Jun Sun>=8 1:00 1:00 D
0N/ARule Moncton 1933 1935 - Sep Sun>=8 1:00 0 S
0N/ARule Moncton 1936 1938 - Jun Sun>=1 1:00 1:00 D
0N/ARule Moncton 1936 1938 - Sep Sun>=1 1:00 0 S
0N/ARule Moncton 1939 only - May 27 1:00 1:00 D
0N/ARule Moncton 1939 1941 - Sep Sat>=21 1:00 0 S
0N/ARule Moncton 1940 only - May 19 1:00 1:00 D
0N/ARule Moncton 1941 only - May 4 1:00 1:00 D
0N/ARule Moncton 1946 1972 - Apr lastSun 2:00 1:00 D
0N/ARule Moncton 1946 1956 - Sep lastSun 2:00 0 S
0N/ARule Moncton 1957 1972 - Oct lastSun 2:00 0 S
0N/ARule Moncton 1993 2006 - Apr Sun>=1 0:01 1:00 D
0N/ARule Moncton 1993 2006 - Oct lastSun 0:01 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -5:00 - EST 1902 Jun 15
0N/A -4:00 Canada A%sT 1933
0N/A -4:00 Moncton A%sT 1942
0N/A -4:00 Canada A%sT 1946
0N/A -4:00 Moncton A%sT 1973
0N/A -4:00 Canada A%sT 1993
0N/A -4:00 Moncton A%sT 2007
0N/A# From Paul Eggert (2006-07-09):
0N/A# Shanks & Pottenger write that since 1970 most of Quebec has been
0N/A# From Paul Eggert (2006-06-27):
0N/A# Matthews and Vincent (1998) also write that Quebec east of the -63
0N/A# meridian is supposed to observe AST, but residents as far east as
0N/A# Natashquan use
EST/EDT, and residents east of Natashquan use AST.
0N/A# In "Official time in Quebec" the Quebec department of justice writes in
0N/A# that "The residents of the Municipality of the
0N/A# Cote-Nord-du-Golfe-Saint-Laurent and the municipalities of Saint-Augustin,
0N/A# Bonne-Esperance and Blanc-Sablon apply the Official Time Act as it is
0N/A# written and use Atlantic standard time all year round. The same applies to
0N/A# the residents of the Native facilities along the lower North Shore."
0N/A# says this common practice was codified into law as of 2007.
0N/A# For lack of better info, guess this practice began around 1970, contra to
0N/A# Shanks & Pottenger who have this region observing
AST/ADT.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Mont 1917 only - Mar 25 2:00 1:00 D
0N/ARule Mont 1917 only - Apr 24 0:00 0 S
0N/ARule Mont 1919 only - Mar 31 2:30 1:00 D
0N/ARule Mont 1919 only - Oct 25 2:30 0 S
0N/ARule Mont 1920 only - May 2 2:30 1:00 D
0N/ARule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
0N/ARule Mont 1921 only - May 1 2:00 1:00 D
0N/ARule Mont 1922 only - Apr 30 2:00 1:00 D
0N/ARule Mont 1924 only - May 17 2:00 1:00 D
0N/ARule Mont 1924 1926 - Sep lastSun 2:30 0 S
0N/ARule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
0N/A# The 1927-to-1937 rules can be expressed more simply as
0N/A# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
0N/A# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
0N/A# The rules below avoid use of 24:00
0N/A# (which pre-1998 versions of zic cannot handle).
0N/ARule Mont 1927 only - May 1 0:00 1:00 D
0N/ARule Mont 1927 1932 - Sep lastSun 0:00 0 S
0N/ARule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
0N/ARule Mont 1932 only - May 1 0:00 1:00 D
0N/ARule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
0N/ARule Mont 1933 only - Oct 1 0:00 0 S
0N/ARule Mont 1934 1939 - Sep lastSun 0:00 0 S
0N/ARule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
0N/ARule Mont 1945 1948 - Sep lastSun 2:00 0 S
0N/ARule Mont 1949 1950 - Oct lastSun 2:00 0 S
0N/ARule Mont 1951 1956 - Sep lastSun 2:00 0 S
0N/ARule Mont 1957 1973 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -4:00 Canada A%sT 1970
0N/A -5:00 Mont E%sT 1918
0N/A -5:00 Canada E%sT 1919
0N/A -5:00 Mont E%sT 1942 Feb 9 2:00s
0N/A -5:00 Canada E%sT 1946
0N/A -5:00 Mont E%sT 1974
0N/A# From Paul Eggert (2006-07-09):
0N/A# Shanks & Pottenger write that since 1970 most of Ontario has been like
0N/A# Thunder Bay skipped DST in 1973.
0N/A# Many smaller locales did not observe peacetime DST until 1974;
0N/A# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
0N/A# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
0N/A# From Mark Brader (2003-07-26):
0N/A# [According to the Toronto Star] Orillia, Ontario, adopted DST
0N/A# effective Saturday, 1912-06-22, 22:00; the article mentions that
0N/A# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
0N/A# have already done so. In Orillia DST was to run until Saturday,
0N/A# 1912-08-31 (no time mentioned), but it was met with considerable
0N/A# hostility from certain segments of the public, and was revoked after
0N/A# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
0N/A# presumably that should be -07-06. (1912-06-19, -07-12; also letters
0N/A# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
0N/A# From Paul Eggert (1997-10-17):
0N/A# Mark Brader writes that an article in the 1997-10-14 Toronto Star
0N/A# says that Atikokan, Ontario currently does not observe DST,
0N/A# He also writes that the
0N/A# Ontario Time Act (1990, Chapter T.9)
0N/A# Officially Atikokan is therefore on
CST/CDT, and most likely this report
0N/A# concerns a non-official time observed as a matter of local practice.
0N/A# From Paul Eggert (2000-10-02):
0N/A# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
0N/A# New Osnaburgh observe CST all year, that Big Trout Lake observes
0N/A# violation of the official Ontario rules.
0N/A# From Paul Eggert (2006-07-09):
0N/A# Chris Walton (2006-07-06) mentioned an article by Stephanie MacLellan in the
0N/A# 2005-07-21 Chronicle-Journal, which said:
0N/A# The clocks in Atikokan stay set on standard time year-round.
0N/A# This means they spend about half the time on central time and
0N/A# the other half on eastern time.
0N/A# For the most part, the system works, Mayor Dennis Brown said.
0N/A# "The majority of businesses in Atikokan deal more with Eastern
0N/A# Canada, but there are some that deal with Western Canada," he
0N/A# said. "I don't see any changes happening here."
0N/A# Walton also writes "Supposedly Pickle Lake and Mishkeegogamang
0N/A# [New Osnaburgh] follow the same practice."
0N/A# From Garry McKinnon (2006-07-14) via Chris Walton:
0N/A# I chatted with a member of my board who has an outstanding memory
0N/A# and a long history in Atikokan (and in the telecom industry) and he
0N/A# can say for certain that Atikokan has been practicing the current
0N/A# time keeping since 1952, at least.
0N/A# From Paul Eggert (2006-07-17):
0N/A# Shanks & Pottenger say that Atikokan has agreed with Rainy River
0N/A# ever since standard time was introduced, but the information from
0N/A# McKinnon sounds more authoritative. For now, assume that Atikokan
0N/A# switched to EST immediately after WWII era daylight saving time
0N/A# entry since our cutoff date of 1970, so we can move
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Toronto 1919 only - Mar 30 23:30 1:00 D
0N/ARule Toronto 1919 only - Oct 26 0:00 0 S
0N/ARule Toronto 1920 only - May 2 2:00 1:00 D
0N/ARule Toronto 1920 only - Sep 26 0:00 0 S
0N/ARule Toronto 1921 only - May 15 2:00 1:00 D
0N/ARule Toronto 1921 only - Sep 15 2:00 0 S
0N/ARule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
0N/A# Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
0N/ARule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
0N/ARule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
0N/A# The 1927-to-1939 rules can be expressed more simply as
0N/A# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
0N/A# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
0N/A# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
0N/A# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
0N/A# The rules below avoid use of Sun>=25
0N/A# (which pre-2004 versions of zic cannot handle).
0N/ARule Toronto 1927 1932 - Sep lastSun 2:00 0 S
0N/ARule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
0N/ARule Toronto 1932 only - May 1 2:00 1:00 D
0N/ARule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
0N/ARule Toronto 1933 only - Oct 1 2:00 0 S
0N/ARule Toronto 1934 1939 - Sep lastSun 2:00 0 S
0N/ARule Toronto 1945 1946 - Sep lastSun 2:00 0 S
0N/ARule Toronto 1946 only - Apr lastSun 2:00 1:00 D
0N/ARule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
0N/ARule Toronto 1947 1948 - Sep lastSun 0:00 0 S
0N/ARule Toronto 1949 only - Nov lastSun 0:00 0 S
0N/ARule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
0N/ARule Toronto 1950 only - Nov lastSun 2:00 0 S
0N/ARule Toronto 1951 1956 - Sep lastSun 2:00 0 S
0N/A# Shanks & Pottenger say Toronto ended DST a week early in 1971,
0N/A# namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this
0N/A# is wrong, and that he had confirmed it by checking the 1971-10-30
0N/A# Toronto Star, which said that DST was ending 1971-10-31 as usual.
0N/ARule Toronto 1957 1973 - Oct lastSun 2:00 0 S
0N/A# From Paul Eggert (2003-07-27):
0N/A# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
0N/A# Port Arthur, Ontario, the principle of the Bill has been in
0N/A# operation for the past three years, and in the City of Moose Jaw,
0N/A# Saskatchewan, for one year."
0N/A# Thunder Bay Museum (2003-11-12):
0N/A# There is some suggestion, however, that, by-law or not, daylight
0N/A# savings time was being practiced in Fort William and Port Arthur
0N/A# before 1909.... [I]n 1910, the line between the Eastern and Central
0N/A# Time Zones was permanently moved about two hundred miles west to
0N/A# include the Thunder Bay area.... When Canada adopted daylight
0N/A# savings time in 1916, Fort William and Port Arthur, having done so
0N/A# already, did not change their clocks.... During the Second World
0N/A# War,... [t]he cities agreed to implement DST during the summer
0N/A# months for the remainder of the war years.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -5:00 Canada E%sT 1919
0N/A -5:00 Toronto E%sT 1942 Feb 9 2:00s
0N/A -5:00 Canada E%sT 1946
0N/A -5:00 Toronto E%sT 1974
0N/A -5:00 Canada E%sT 1970
0N/A -5:00 Mont E%sT 1973
0N/A -5:00 Canada E%sT 1940 Sep 29
0N/A -5:00 1:00 EDT 1942 Feb 9 2:00s
0N/A -6:00 Canada C%sT 1940 Sep 29
0N/A -6:00 1:00 CDT 1942 Feb 9 2:00s
0N/A -6:00 Canada C%sT 1940 Sep 29
0N/A -6:00 1:00 CDT 1942 Feb 9 2:00s
0N/A -6:00 Canada C%sT 1945 Sep 30 2:00
0N/A# From Rob Douglas (2006-04-06):
0N/A# the old Manitoba Time Act - as amended by Bill 2, assented to
0N/A# March 27, 1987 ... said ...
0N/A# "between two o'clock Central Standard Time in the morning of
0N/A# the first Sunday of April of each year and two o'clock Central
0N/A# Standard Time in the morning of the last Sunday of October next
0N/A# following, one hour in advance of Central Standard Time."...
0N/A# I believe that the English legislation [of the old time act] had =
0N/A# been assented to (March 22, 1967)....
0N/A# Also, as far as I can tell, there was no order-in-council varying
0N/A# the time of Daylight Saving Time for 2005 and so the provisions of
0N/A# the 1987 version would apply - the changeover was at 2:00 Central
0N/A# Standard Time (
i.e. not until 3:00 Central Daylight Time).
0N/A# From Paul Eggert (2006-04-10):
0N/A# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
0N/A# starting 1966. Since 02:00s is clearly correct for 1967 on, assume
0N/A# it was also 02:00s in 1966.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Winn 1916 only - Apr 23 0:00 1:00 D
0N/ARule Winn 1916 only - Sep 17 0:00 0 S
0N/ARule Winn 1918 only - Apr 14 2:00 1:00 D
0N/ARule Winn 1918 only - Oct 31 2:00 0 S
0N/ARule Winn 1937 only - May 16 2:00 1:00 D
0N/ARule Winn 1937 only - Sep 26 2:00 0 S
0N/ARule Winn 1942 only - Feb 9 2:00 1:00 W # War
0N/ARule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
0N/ARule Winn 1945 only - Sep lastSun 2:00 0 S
0N/ARule Winn 1946 only - May 12 2:00 1:00 D
0N/ARule Winn 1946 only - Oct 13 2:00 0 S
0N/ARule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
0N/ARule Winn 1947 1949 - Sep lastSun 2:00 0 S
0N/ARule Winn 1950 only - May 1 2:00 1:00 D
0N/ARule Winn 1950 only - Sep 30 2:00 0 S
0N/ARule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
0N/ARule Winn 1951 1958 - Sep lastSun 2:00 0 S
0N/ARule Winn 1959 only - Oct lastSun 2:00 0 S
0N/ARule Winn 1960 only - Sep lastSun 2:00 0 S
0N/ARule Winn 1963 only - Apr lastSun 2:00 1:00 D
0N/ARule Winn 1963 only - Sep 22 2:00 0 S
0N/ARule Winn 1966 1986 - Apr lastSun 2:00s 1:00 D
0N/ARule Winn 1966 2005 - Oct lastSun 2:00s 0 S
0N/ARule Winn 1987 2005 - Apr Sun>=1 2:00s 1:00 D
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 Winn C%sT 2006
0N/A# From Mark Brader (2003-07-26):
0N/A# The first actual adoption of DST in Canada was at the municipal
0N/A# level. As the [Toronto] Star put it (1912-06-07), "While people
0N/A# elsewhere have long been talking of legislation to save daylight,
0N/A# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
0N/A# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
0N/A# presumably late evening, as below), and would run until "the end of
0N/A# the summer". The discrepancy between municipal time and railroad
0N/A# From Paul Eggert (2003-07-27):
0N/A# Willett (1914-03) notes that DST "has been in operation ... in the
0N/A# City of Moose Jaw, Saskatchewan, for one year."
0N/A# From Paul Eggert (2006-03-22):
0N/A# Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
0N/A# Some western towns (
e.g. Swift Current) switched from
MST/MDT to CST in 1972.
0N/A# Other western towns (
e.g. Lloydminster) are like Edmonton.
0N/A# Matthews and Vincent (1998) write that Denare Beach and Creighton
0N/A# are like Winnipeg, in violation of Saskatchewan law.
0N/A# From W. Jones (1992-11-06):
0N/A# The. . .below is based on information I got from our law library, the
0N/A# provincial archives, and the provincial Community Services department.
0N/A# A precise history would require digging through newspaper archives, and
0N/A# since you didn't say what you wanted, I didn't bother.
0N/A# Saskatchewan is split by a time zone meridian (105W) and over the years
0N/A# the boundary became pretty ragged as communities near it reevaluated
0N/A# their affiliations in one direction or the other. In 1965 a provincial
0N/A# referendum favoured legislating common time practices.
0N/A# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
0N/A# Saskatchewan 1978) was proclaimed, and established that the eastern
0N/A# part of Saskatchewan would use CST year round, that districts in
0N/A# northwest Saskatchewan would by default follow CST but could opt to
0N/A# follow Mountain Time rules (thus 1 hour difference in the winter and
0N/A# zero in the summer), and that districts in southwest Saskatchewan would
0N/A# by default follow MT but could opt to follow CST.
0N/A# It took a few years for the dust to settle (I know one story of a town
0N/A# on one time zone having its school in another, such that a mom had to
0N/A# serve her family lunch in two shifts), but presently it seems that only
0N/A# a few towns on the border with Alberta (
e.g. Lloydminster) follow MT
0N/A# rules any more; all other districts appear to have used CST year round
0N/A# since sometime in the 1960s.
0N/A# From Chris Walton (2006-06-26):
0N/A# The Saskatchewan time act which was last updated in 1996 is about 30 pages
0N/A# long and rather painful to read.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Regina 1918 only - Apr 14 2:00 1:00 D
0N/ARule Regina 1918 only - Oct 31 2:00 0 S
0N/ARule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
0N/ARule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
0N/ARule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
0N/ARule Regina 1937 only - Oct Sun>=8 0:00 0 S
0N/ARule Regina 1938 only - Oct Sun>=1 0:00 0 S
0N/ARule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
0N/ARule Regina 1942 only - Feb 9 2:00 1:00 W # War
0N/ARule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
0N/ARule Regina 1945 only - Sep lastSun 2:00 0 S
0N/ARule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
0N/ARule Regina 1946 only - Oct Sun>=8 2:00 0 S
0N/ARule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
0N/ARule Regina 1947 1957 - Sep lastSun 2:00 0 S
0N/ARule Regina 1959 only - Apr lastSun 2:00 1:00 D
0N/ARule Regina 1959 only - Oct lastSun 2:00 0 S
0N/ARule Swift 1957 only - Apr lastSun 2:00 1:00 D
0N/ARule Swift 1957 only - Oct lastSun 2:00 0 S
0N/ARule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
0N/ARule Swift 1959 only - Oct lastSun 2:00 0 S
0N/ARule Swift 1960 1961 - Sep lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -7:00 Regina M%sT 1960 Apr lastSun 2:00
0N/A -7:00 Canada M%sT 1946 Apr lastSun 2:00
0N/A -7:00 Regina M%sT 1950
0N/A -7:00 Swift M%sT 1972 Apr lastSun 2:00
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
0N/ARule Edm 1918 only - Oct 31 2:00 0 S
0N/ARule Edm 1919 only - May 27 2:00 0 S
0N/ARule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
0N/ARule Edm 1920 only - Oct lastSun 2:00 0 S
0N/ARule Edm 1921 1923 - Sep lastSun 2:00 0 S
0N/ARule Edm 1942 only - Feb 9 2:00 1:00 W # War
0N/ARule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
0N/ARule Edm 1945 only - Sep lastSun 2:00 0 S
0N/ARule Edm 1947 only - Apr lastSun 2:00 1:00 D
0N/ARule Edm 1947 only - Sep lastSun 2:00 0 S
0N/ARule Edm 1967 only - Apr lastSun 2:00 1:00 D
0N/ARule Edm 1967 only - Oct lastSun 2:00 0 S
0N/ARule Edm 1969 only - Apr lastSun 2:00 1:00 D
0N/ARule Edm 1969 only - Oct lastSun 2:00 0 S
0N/ARule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
0N/ARule Edm 1972 2006 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# From Paul Eggert (2006-03-22):
0N/A# Shanks & Pottenger write that since 1970 most of this region has
0N/A# been like Vancouver.
0N/A# Dawson Creek uses MST. Much of east BC is like Edmonton.
0N/A# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Vanc 1918 only - Apr 14 2:00 1:00 D
0N/ARule Vanc 1918 only - Oct 31 2:00 0 S
0N/ARule Vanc 1942 only - Feb 9 2:00 1:00 W # War
0N/ARule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
0N/ARule Vanc 1945 only - Sep 30 2:00 0 S
0N/ARule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
0N/ARule Vanc 1946 only - Oct 13 2:00 0 S
0N/ARule Vanc 1947 1961 - Sep lastSun 2:00 0 S
0N/ARule Vanc 1962 2006 - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -8:00 Vanc P%sT 1987
0N/A -8:00 Canada P%sT 1947
0N/A -8:00 Vanc P%sT 1972 Aug 30 2:00
0N/A# Northwest Territories, Nunavut, Yukon
0N/A# From Paul Eggert (2006-03-22):
0N/A# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
0N/A# Mathew Englander (1996-10-07) gives the following refs:
0N/A# * 1967. Paragraph 28(34)(g) of the Interpretation Act,
S.C. 1967-68,
0N/A# c. 7 defines Yukon standard time as UTC-9. This is still valid;
0N/A# see Interpretation Act,
R.S.C. 1985, c. I-21, s. 35(1).
0N/A# *
C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
0N/A# *
O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
0N/A# Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
0N/A# From Chris Walton (2006-06-26):
0N/A# Here is a link to the old daylight saving portion of the interpretation
0N/A# act which was last updated in 1987:
0N/A# From Rives McDow (1999-09-04):
0N/A# Nunavut ... moved ... to incorporate the whole territory into one time zone.
0N/A# Nunavut moves to single time zone Oct. 31
0N/A# From Antoine Leca (1999-09-06):
0N/A# We then need to create a new timezone for the Kitikmeot region of Nunavut
0N/A# to differentiate it from the Yellowknife region.
0N/A# From Paul Eggert (1999-09-20):
0N/A# Basic Facts: The New Territory
0N/A# </a> (1999) reports that Pangnirtung operates on eastern time,
0N/A# and that Coral Harbour does not observe DST. We don't know when
0N/A# Pangnirtung switched to eastern time; we'll guess 1995.
0N/A# From Rives McDow (1999-11-08):
0N/A# On October 31, when the rest of Nunavut went to Central time,
0N/A# Pangnirtung wobbled. Here is the result of their wobble:
0N/A# The following businesses and organizations in Pangnirtung use Central Time:
0N/A# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
0N/A# Eastern Arctic National Parks, A & D Specialist
0N/A# The following businesses and organizations in Pangnirtung use Eastern Time:
0N/A# Hamlet office, All other businesses, Both schools, Airport operator
0N/A# This has made for an interesting situation there, which warranted the news.
0N/A# No one there that I spoke with seems concerned, or has plans to
0N/A# change the local methods of keeping time, as it evidently does not
0N/A# really interfere with any activities or make things difficult locally.
0N/A# They plan to celebrate New Year's turn-over twice, one hour apart,
0N/A# so it appears that the situation will last at least that long.
0N/A# The Nunavut Intergovernmental Affairs hopes that they will "come to
0N/A# their senses", but the locals evidently don't see any problem with
0N/A# the current state of affairs.
0N/A# From Michaela Rodrigue, writing in the
0N/A# Nunatsiaq News (1999-11-19)</a>:
0N/A# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
0N/A# central - or Nunavut time - for government offices, and eastern time
0N/A# for municipal offices and schools.... Igloolik [was similar but then]
0N/A# made the switch to central time on Saturday, Nov. 6.
0N/A# From Paul Eggert (2000-10-02):
0N/A# Matthews and Vincent (1998) say the following, but we lack histories
0N/A# for these potential new Zones.
0N/A# The Canadian Forces station at Alert uses Eastern Time while the
0N/A# handful of residents at the Eureka weather station [in the Central
0N/A# zone] skip daylight savings. Baffin Island, which is crossed by the
0N/A# Central, Eastern and Atlantic Time zones only uses Eastern Time.
0N/A# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
0N/A# Central Time and Southampton Island [in the Central zone] is not
0N/A# required to use daylight savings.
0N/A# Nunavut now has two time zones
0N/A# The Nunavut government would allow its employees in Kugluktuk and
0N/A# Cambridge Bay to operate on central time year-round, putting them
0N/A# one hour behind the rest of Nunavut for six months during the winter.
0N/A# At the end of October the two communities had rebelled against
0N/A# Nunavut's unified time zone, refusing to shift to eastern time with
0N/A# the rest of the territory for the winter. Cambridge Bay remained on
0N/A# central time, while Kugluktuk, even farther west, reverted to
0N/A# mountain time, which they had used before the advent of Nunavut's
0N/A# unified time zone in 1999.
0N/A# From Rives McDow (2001-01-20), quoting the Nunavut government:
0N/A# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
0N/A# From Paul Eggert (2000-12-04):
0N/A# Let's just keep track of the official times for now.
0N/A# From Rives McDow (2001-03-07):
0N/A# The premier of Nunavut has issued a ministerial statement advising
0N/A# that effective 2001-04-01, the territory of Nunavut will revert
0N/A# back to three time zones (mountain, central, and eastern). Of the
0N/A# cities in Nunavut, Coral Harbor is the only one that I know of that
0N/A# has said it will not observe dst, staying on EST year round. I'm
0N/A# checking for more info, and will get back to you if I come up with
0N/A# From Gwillim Law (2005-05-21):
0N/A# According to maps at
0N/A# (both dated 2003), and
0N/A# (from a 1998 Canadian Geographic article), the de facto and de jure time
0N/A# for Southampton Island (at the north end of Hudson Bay) is UTC-5 all year
0N/A# round. Using Google, it's easy to find other websites that confirm this.
0N/A# I wasn't able to find how far back this time regimen goes, but since it
0N/A# predates the creation of Nunavut, it probably goes back many years....
0N/A# The Inuktitut name of Coral Harbour is Sallit, but it's rarely used.
0N/A# From Paul Eggert (2005-07-26):
0N/A# For lack of better information, assume that Southampton Island observed
0N/A# daylight saving only during wartime.
0N/A# From Chris Walton (2007-03-01):
0N/A# ... the community of Resolute (located on Cornwallis Island in
0N/A# Nunavut) moved from Central Time to Eastern Time last November.
0N/A# Basically the community did not change its clocks at the end of
0N/A# daylight saving....
0N/A# From Chris Walton (2007-03-14):
0N/A# Today I phoned the "hamlet office" to find out what Resolute was doing with
0N/A# The individual that answered the phone confirmed that the clocks did not
0N/A# move at the end of daylight saving on October 29/2006. He also told me that
0N/A# the clocks did not move this past weekend (March 11/2007)....
833N/A# From Chris Walton (2008-11-13):
833N/A#
...the residents of Resolute believe that they are changing "time zones"
833N/A# twice a year. In winter months, local time is qualified with "Eastern
833N/A# Time" which is really "Eastern Standard Time (UTC-5)". In summer
833N/A# months, local time is qualified with "Central Time" which is really
833N/A# "Central Daylight Time (UTC-5)"...
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule NT_YK 1918 only - Apr 14 2:00 1:00 D
0N/ARule NT_YK 1918 only - Oct 27 2:00 0 S
0N/ARule NT_YK 1919 only - May 25 2:00 1:00 D
0N/ARule NT_YK 1919 only - Nov 1 0:00 0 S
0N/ARule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
0N/ARule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
0N/ARule NT_YK 1945 only - Sep 30 2:00 0 S
0N/ARule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
0N/ARule NT_YK 1965 only - Oct lastSun 2:00 0 S
0N/ARule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
0N/ARule NT_YK 1980 2006 - Oct lastSun 2:00 0 S
0N/ARule NT_YK 1987 2006 - Apr Sun>=1 2:00 1:00 D
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
0N/A -5:00 Canada E%sT 1999 Oct 31 2:00
0N/A -6:00 Canada C%sT 2000 Oct 29 2:00
0N/A# formerly Frobisher Bay
0N/A -5:00 NT_YK E%sT 1999 Oct 31 2:00
0N/A -6:00 Canada C%sT 2000 Oct 29 2:00
833N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
833N/ARule Resolute 2006 max - Nov Sun>=1 2:00 0 ES
833N/ARule Resolute 2007 max - Mar Sun>=8 2:00 0 CD
0N/A -6:00 NT_YK C%sT 2000 Oct 29 2:00
0N/A -5:00 - EST 2001 Apr 1 3:00
0N/A -6:00 Canada C%sT 2006 Oct 29 2:00
0N/A -6:00 NT_YK C%sT 2000 Oct 29 2:00
0N/A -5:00 - EST 2001 Apr 1 3:00
0N/A -7:00 NT_YK M%sT 1999 Oct 31 2:00
0N/A -6:00 Canada C%sT 2000 Oct 29 2:00
0N/A -5:00 - EST 2000 Nov 5 0:00
0N/A -6:00 - CST 2001 Apr 1 3:00
0N/A -7:00 NT_YK M%sT 1980
0N/A -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
0N/A -7:00 NT_YK M%sT 1980
0N/A -9:00 NT_YK Y%sT 1966 Jul 1 2:00
0N/A -8:00 NT_YK P%sT 1980
0N/A -9:00 NT_YK Y%sT 1973 Oct 28 0:00
0N/A -8:00 NT_YK P%sT 1980
0N/A###############################################################################
0N/A# From Paul Eggert (2001-03-05):
0N/A# The Investigation and Analysis Service of the
0N/A# Mexican Library of Congress (MLoC) has published a
0N/A# history of Mexican local time (in Spanish)
0N/A# Here are the discrepancies between Shanks & Pottenger (S&P) and the MLoC.
0N/A# (In all cases we go with the MLoC.)
0N/A# S&P report that Baja was at -8:00 in 1922/1923.
0N/A# S&P say the 1930 transition in Baja was 1930-11-16.
0N/A# S&P report no DST during summer 1931.
0N/A# S&P report a transition at 1932-03-30 23:00, not 1932-04-01.
0N/A# From Gwillim Law (2001-02-20):
0N/A# There are some other discrepancies between the Decrees page and the
0N/A# tz database. I think they can best be explained by supposing that
0N/A# the researchers who prepared the Decrees page failed to find some of
0N/A# the relevant documents.
0N/A# From Alan Perry (1996-02-15):
0N/A# A guy from our Mexico subsidiary finally found the Presidential Decree
0N/A# outlining the timezone changes in Mexico.
0N/A# ------------- Begin Forwarded Message -------------
0N/A# I finally got my hands on the Official Presidential Decree that sets up the
0N/A# rules for the DST changes. The rules are:
0N/A# 1. The country is divided in 3 timezones:
0N/A# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
0N/A# at 2:00 AM, the times in each zone are as follows:
0N/A# 3. The rest of the year, the times are as follows:
0N/A# The Decree was published in Mexico's Official Newspaper on January 4th.
0N/A# -------------- End Forwarded Message --------------
0N/A# From Paul Eggert (1996-06-12):
0N/A# For an English translation of the decree, see
0N/A# ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
0N/A# From Rives McDow (1998-10-08):
0N/A# The State of Quintana Roo has reverted back to central STD and DST times
0N/A# (
i.e. UTC -0600 and -0500 as of 1998-08-02).
0N/A# From Rives McDow (2000-01-10):
0N/A# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
0N/A# zone 5 hours from the International Date Line, and will not observe daylight
0N/A# savings time so as to stay on the same time zone as the southern part of
0N/A# Arizona year round.
0N/A# From Jesper Norgaard, translating
0N/A# In Oaxaca, the 55.000 teachers from the Section 22 of the National
0N/A# Syndicate of Education Workers, refuse to apply daylight saving each
0N/A# year, so that the more than 10,000 schools work at normal hour the
0N/A# From Gwillim Law (2001-01-19):
0N/A# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
0N/A# that Summer Time will be reduced from seven to five months, starting
0N/A# [translated], says "summer time will ... take effect on the first Sunday
0N/A# in May, and end on the last Sunday of September.
0N/A# From Arthur David Olson (2001-01-25):
0N/A# The 2001-01-24 traditional Washington Post contained the page one
0N/A# story "Timely Issue Divides Mexicans."...
0N/A# ... Mexico City Mayor Lopez Obrador "
...is threatening to keep
0N/A# Mexico City and its 20 million residents on a different time than
0N/A# the rest of the country..." In particular, Lopez Obrador would abolish
0N/A# observation of Daylight Saving Time.
0N/A# Official statute published by the Energy Department
0N/A# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
0N/A# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
0N/A# From Paul Eggert (2001-03-03):
0N/A# James F. Smith writes in today's LA Times
0N/A# * Sonora will continue to observe standard time.
0N/A# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
0N/A# the Federal District will not adopt DST.
0N/A# * 4 of 16 district leaders announced they'll ignore the decree.
0N/A# * The decree does not affect federal-controlled facilities including
0N/A# the airport, banks, hospitals, and schools.
0N/A# For now we'll assume that the Federal District will bow to federal rules.
0N/A# From Jesper Norgaard (2001-04-01):
0N/A# I found some references to the Mexican application of daylight
0N/A# saving, which modifies what I had already sent you, stating earlier
0N/A# that a number of northern Mexican states would go on daylight
0N/A# saving. The modification reverts this to only cover Baja California
0N/A# (Norte), while all other states (except Sonora, who has no daylight
0N/A# saving all year) will follow the original decree of president
0N/A# Vicente Fox, starting daylight saving May 6, 2001 and ending
0N/A# September 30, 2001.
0N/A# From Reuters (2001-09-04):
0N/A# Mexico's Supreme Court on Tuesday declared that daylight savings was
0N/A# unconstitutional in Mexico City, creating the possibility the
0N/A# capital will be in a different time zone from the rest of the nation
0N/A# next year.... The Supreme Court's ruling takes effect at 2:00
0N/A#
a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
0N/A# standard time. "This is so residents of the Federal District are not
0N/A# subject to unexpected time changes," a statement from the court said.
0N/A# From Jesper Norgaard Welen (2002-03-12):
0N/A# ... consulting my local grocery store(!) and my coworkers, they all insisted
0N/A# that a new decision had been made to reinstate US style DST in Mexico....
0N/A# confirms this. Sonora as usual is the only state where DST is not applied.
2171N/A# From Steffen Thorsen (2009-12-28):
2171N/A# > Mexico's House of Representatives has approved a proposal for northern
2171N/A# > Mexico's border cities to share the same daylight saving schedule as
2171N/A# Now this has passed both the Congress and the Senate, so starting from
2171N/A# 2010, some border regions will be the same:
2171N/A# Could not find the new law text, but the proposed law text changes are here:
2171N/A# There is also a list of the votes here:
2171N/A# From Arthur David Olson (2010-01-20):
2171N/A# En los municipios fronterizos de Tijuana y Mexicali en Baja California;
2171N/A# Juárez y Ojinaga en Chihuahua; Acuña y Piedras Negras en Coahuila;
2171N/A# Anáhuac en Nuevo León; y Nuevo Laredo, Reynosa y Matamoros en
2171N/A# Tamaulipas, la aplicación de este horario estacional surtirá efecto
2171N/A# desde las dos horas del segundo domingo de marzo y concluirá a las dos
2171N/A# horas del primer domingo de noviembre.
2171N/A# En los municipios fronterizos que se encuentren ubicados en la franja
2171N/A# fronteriza norte en el territorio comprendido entre la línea
2171N/A# internacional y la línea paralela ubicada a una distancia de veinte
2171N/A# kilómetros, así como la Ciudad de Ensenada, Baja California, hacia el
2171N/A# interior del país, la aplicación de este horario estacional surtirá
2171N/A# efecto desde las dos horas del segundo domingo de marzo y concluirá a
2171N/A# las dos horas del primer domingo de noviembre.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Mexico 1939 only - Feb 5 0:00 1:00 D
0N/ARule Mexico 1939 only - Jun 25 0:00 0 S
0N/ARule Mexico 1940 only - Dec 9 0:00 1:00 D
0N/ARule Mexico 1941 only - Apr 1 0:00 0 S
0N/ARule Mexico 1943 only - Dec 16 0:00 1:00 W # War
0N/ARule Mexico 1944 only - May 1 0:00 0 S
0N/ARule Mexico 1950 only - Feb 12 0:00 1:00 D
0N/ARule Mexico 1950 only - Jul 30 0:00 0 S
0N/ARule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
0N/ARule Mexico 1996 2000 - Oct lastSun 2:00 0 S
0N/ARule Mexico 2001 only - May Sun>=1 2:00 1:00 D
0N/ARule Mexico 2001 only - Sep lastSun 2:00 0 S
0N/ARule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
0N/ARule Mexico 2002 max - Oct lastSun 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -6:00 - CST 1981 Dec 23
0N/A -5:00 Mexico E%sT 1998 Aug 2 2:00
0N/A -6:00 - CST 1981 Dec 23
0N/A -5:00 - EST 1982 Dec 2
2171N/A# Coahuila, Durango, Nuevo Leon, Tamaulipas (near US border)
2171N/A# Coahuila, Durango, Nuevo Leon, Tamaulipas (away from US border)
0N/A -7:00 - MST 1927 Jun 10 23:00
0N/A -6:00 - CST 1930 Nov 15
0N/A -7:00 - MST 1931 May 1 23:00
0N/A -6:00 - CST 1931 Oct
0N/A -7:00 - MST 1932 Apr 1
0N/A -6:00 Mexico C%sT 2001 Sep 30 02:00
0N/A -6:00 - CST 2002 Feb 20
2171N/A# Chihuahua (near US border)
2171N/A -7:00 - MST 1927 Jun 10 23:00
2171N/A -7:00 - MST 1931 May 1 23:00
2171N/A -6:00 - CST 1998 Apr Sun>=1 3:00
2171N/A# Chihuahua (away from US border)
0N/A -7:00 - MST 1927 Jun 10 23:00
0N/A -6:00 - CST 1930 Nov 15
0N/A -7:00 - MST 1931 May 1 23:00
0N/A -6:00 - CST 1931 Oct
0N/A -7:00 - MST 1932 Apr 1
0N/A -6:00 Mexico C%sT 1998
0N/A -6:00 - CST 1998 Apr Sun>=1 3:00
0N/A -7:00 - MST 1927 Jun 10 23:00
0N/A -6:00 - CST 1930 Nov 15
0N/A -7:00 - MST 1931 May 1 23:00
0N/A -6:00 - CST 1931 Oct
0N/A -7:00 - MST 1932 Apr 1
0N/A -6:00 - CST 1942 Apr 24
0N/A -7:00 - MST 1949 Jan 14
0N/A -7:00 Mexico M%sT 1999
0N/A# Baja California Sur, Nayarit, Sinaloa
0N/A -7:00 - MST 1927 Jun 10 23:00
0N/A -6:00 - CST 1930 Nov 15
0N/A -7:00 - MST 1931 May 1 23:00
0N/A -6:00 - CST 1931 Oct
0N/A -7:00 - MST 1932 Apr 1
0N/A -6:00 - CST 1942 Apr 24
0N/A -7:00 - MST 1949 Jan 14
2171N/A# Baja California (near US border)
0N/A -8:00 - PST 1927 Jun 10 23:00
0N/A -7:00 - MST 1930 Nov 15
0N/A -8:00 - PST 1931 Apr 1
0N/A -8:00 1:00 PDT 1931 Sep 30
0N/A -8:00 - PST 1942 Apr 24
0N/A -8:00 1:00 PWT 1945 Aug 14 23:00u
0N/A -8:00 1:00 PPT 1945 Nov 12 # Peace
0N/A -8:00 - PST 1948 Apr 5
0N/A -8:00 1:00 PDT 1949 Jan 14
0N/A -8:00 Mexico P%sT 2001
0N/A -8:00 US P%sT 2002 Feb 20
2171N/A# Baja California (away from US border)
2171N/A -8:00 - PST 1927 Jun 10 23:00
2171N/A -8:00 1:00 PWT 1945 Aug 14 23:00u
2171N/A -8:00 1:00 PPT 1945 Nov 12 # Peace
0N/A# From Paul Eggert (2006-03-22):
0N/A# through 1995. This was as per Shanks (1999). But Shanks & Pottenger say
0N/A# Ensenada did not observe DST from 1948 through 1975. Guy Harris reports
0N/A# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
0N/A# Tijuana observe DST," which agrees with Shanks & Pottenger but implies that
0N/A# DST-observance was a town-by-town matter back then. This concerns
0N/A# data after 1970 so most likely there should be at least one Zone
0N/A# name or contents should be.
0N/A###############################################################################
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# Antigua and Barbuda
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# From Sue Williams (2006-12-07):
0N/A# The Bahamas announced about a month ago that they plan to change their DST
0N/A# rules to sync with the
U.S. starting in 2007....
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
640N/ARule Bahamas 1964 1975 - Oct lastSun 2:00 0 S
640N/ARule Bahamas 1964 1975 - Apr lastSun 2:00 1:00 D
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -5:00 Bahamas E%sT 1976
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Barb 1977 only - Jun 12 2:00 1:00 D
0N/ARule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
0N/ARule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
0N/ARule Barb 1979 only - Sep 30 2:00 0 S
0N/ARule Barb 1980 only - Sep 25 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -3:58:28 - BMT 1932 # Bridgetown Mean Time
0N/A# Whitman entirely disagrees with Shanks; go with Shanks & Pottenger.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
0N/ARule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
0N/ARule Belize 1973 only - Dec 5 0:00 1:00 D
0N/ARule Belize 1974 only - Feb 9 0:00 0 S
0N/ARule Belize 1982 only - Dec 18 0:00 1:00 D
0N/ARule Belize 1983 only - Feb 12 0:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# From Dan Jones, reporting in The Royal Gazette (2006-06-26):
0N/A# Next year, however, clocks in the US will go forward on the second Sunday
0N/A# in March, until the first Sunday in November. And, after the Time Zone
0N/A# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
0N/A# Friday, the same thing will happen in Bermuda.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -4:00 - AST 1974 Apr 28 2:00
0N/A -4:00 Bahamas A%sT 1976
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -5:07:12 - KMT 1912 Feb # Kingston Mean Time
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule CR 1979 1980 - Feb lastSun 0:00 1:00 D
0N/ARule CR 1979 1980 - Jun Sun>=1 0:00 0 S
0N/ARule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
0N/A# IATA SSIM (1991-09) says the following was at 1:00;
0N/A# go with Shanks & Pottenger.
0N/ARule CR 1991 only - Jul 1 0:00 0 S
0N/ARule CR 1992 only - Mar 15 0:00 0 S
0N/A# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time
0N/A# From Arthur David Olson (1999-03-29):
0N/A# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
0N/A# the Cuban National Team and the Baltimore Orioles was carried live on
0N/A# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
0N/A# During the game, play-by-play announcer Jim Hunter noted that
0N/A# Time today." (The "two hour" remark referred to losing one hour of
0N/A# sleep on 1999-03-28--when the announcers were in Cuba as it switched
0N/A# to DST--and one more hour on 1999-04-04--when the announcers will have
0N/A# returned to Baltimore, which switches on that date.)
0N/A# From Evert van der Veer via Steffen Thorsen (2004-10-28):
0N/A# Cuba is not going back to standard time this year.
0N/A# From Paul Eggert (2006-03-22):
0N/A# says that it's due to a problem at the Antonio Guiteras
0N/A# thermoelectric plant, and says "This October there will be no return
0N/A# to normal hours (after daylight saving time)".
0N/A# For now, let's assume that it's a temporary measure.
0N/A# From Carlos A. Carnero Delgado (2005-11-12):
0N/A# This year (just like in 2004-2005) there's no change in time zone
0N/A# adjustment in Cuba. We will stay in daylight saving time:
0N/A# From Jesper Norgaard Welen (2006-10-21):
0N/A# An article in GRANMA INTERNACIONAL claims that Cuba will end
0N/A# the 3 years of permanent DST next weekend, see
0N/A# "On Saturday night, October 28 going into Sunday, October 29, at 01:00,
0N/A# watches should be set back one hour -- going back to 00:00 hours -- returning
0N/A# to the normal schedule....
0N/A# From Paul Eggert (2007-03-02):
0N/A# says Cuban clocks will advance at midnight on March 10.
0N/A# For lack of better information, assume Cuba will use US rules,
0N/A# except that it switches at midnight standard time as usual.
640N/A# From Steffen Thorsen (2007-10-25):
640N/A# Carlos Alberto Fonseca Arauz informed me that Cuba will end DST one week
640N/A# earlier - on the last Sunday of October, just like in 2006.
640N/A# He supplied these references:
640N/A# From Alex Kryvenishev (2007-10-25):
640N/A# Here is also article from Granma (Cuba):
640N/A# [Regira] el Horario Normal desde el [proximo] domingo 28 de octubre
640N/A# From Arthur David Olson (2008-03-09):
640N/A# I'm in Maryland which is now observing United States Eastern Daylight
640N/A# Time. At 9:44 local time I used RealPlayer to listen to
640N/A# </a>, a Cuban information station, and heard
640N/A# the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
640N/A# indicating that Cuba is still on standard time.
640N/A# From Steffen Thorsen (2008-03-12):
640N/A# It seems that Cuba will start DST on Sunday, 2007-03-16...
640N/A# It was announced yesterday, according to this source (in Spanish):
640N/A# Some more background information is posted here:
640N/A# The article also says that Cuba has been observing DST since 1963,
640N/A# while Shanks (and tzdata) has 1965 as the first date (except in the
640N/A# 1940's). Many other web pages in Cuba also claim that it has been
640N/A# observed since 1963, but with the exception of 1970 - an exception
640N/A# change some historic records as well.
640N/A# From Jesper Norgaard Welen (2008-03-13):
640N/A# The Cuban time change has just been confirmed on the most authoritative
640N/A# web site, the Granma. Please check out
640N/A# Basically as expected after Steffen Thorsens information, the change
640N/A# will take place midnight between Saturday and Sunday.
640N/A# From Arthur David Olson (2008-03-12):
640N/A# Assume Sun>=15 (third Sunday) going forward.
1227N/A# From Alexander Krivenyshev (2009-03-04)
1227N/A# According to the Radio Reloj - Cuba will start Daylight Saving Time on
1227N/A# midnight between Saturday, March 07, 2009 and Sunday, March 08, 2009-
1227N/A# not on midnight March 14 / March 15 as previously thought.
1227N/A# From Arthur David Olson (2009-03-09)
1227N/A# I listened over the Internet to
1227N/A# this morning; when it was 10:05 a. m. here in Bethesda, Maryland the
1227N/A# the time was announced as "diez cinco"--the same time as here, indicating
1227N/A# that has indeed switched to DST. Assume second Sunday from 2009 forward.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Cuba 1928 only - Jun 10 0:00 1:00 D
0N/ARule Cuba 1928 only - Oct 10 0:00 0 S
0N/ARule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
0N/ARule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
0N/ARule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
0N/ARule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
0N/ARule Cuba 1965 only - Jun 1 0:00 1:00 D
0N/ARule Cuba 1965 only - Sep 30 0:00 0 S
0N/ARule Cuba 1966 only - May 29 0:00 1:00 D
0N/ARule Cuba 1966 only - Oct 2 0:00 0 S
0N/ARule Cuba 1967 only - Apr 8 0:00 1:00 D
0N/ARule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
0N/ARule Cuba 1968 only - Apr 14 0:00 1:00 D
0N/ARule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
0N/ARule Cuba 1969 1971 - Oct lastSun 0:00 0 S
0N/ARule Cuba 1972 1974 - Oct 8 0:00 0 S
0N/ARule Cuba 1975 1977 - Oct lastSun 0:00 0 S
0N/ARule Cuba 1978 only - May 7 0:00 1:00 D
0N/ARule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
0N/ARule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
0N/ARule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
0N/ARule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
0N/ARule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
0N/ARule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
0N/ARule Cuba 1996 only - Oct 6 0:00s 0 S
0N/ARule Cuba 1997 only - Oct 12 0:00s 0 S
0N/ARule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
0N/ARule Cuba 1998 2003 - Oct lastSun 0:00s 0 S
833N/ARule Cuba 2000 2004 - Apr Sun>=1 0:00s 1:00 D
640N/ARule Cuba 2006 max - Oct lastSun 0:00s 0 S
640N/ARule Cuba 2007 only - Mar Sun>=8 0:00s 1:00 D
1227N/ARule Cuba 2008 only - Mar Sun>=15 0:00s 1:00 D
1227N/ARule Cuba 2009 max - Mar Sun>=8 0:00s 1:00 D
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# From Steffen Thorsen (2000-10-30):
0N/A# Enrique Morales reported to me that the Dominican Republic has changed the
0N/A# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
0N/A# From Paul Eggert (2000-12-04):
0N/A# That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
0N/A# From Rives McDow (2000-12-01):
0N/A# Dominican Republic changed its mind and presidential decree on Tuesday,
0N/A# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
0N/A# Dominican Republic will be reverting to 8 hours from the International Date
0N/A# Line, and will not be using DST in the foreseeable future. The reason they
0N/A# decided to use DST was to be in synch with Puerto Rico, who was also going
0N/A# to implement DST. When Puerto Rico didn't implement DST, the president
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule DR 1966 only - Oct 30 0:00 1:00 D
0N/ARule DR 1967 only - Feb 28 0:00 0 S
0N/ARule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
0N/ARule DR 1970 only - Feb 21 0:00 0 S
0N/ARule DR 1971 only - Jan 20 0:00 0 S
0N/ARule DR 1972 1974 - Jan 21 0:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
0N/A -5:00 DR E%sT 1974 Oct 27
0N/A -4:00 - AST 2000 Oct 29 02:00
0N/A -5:00 US E%sT 2000 Dec 3 01:00
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
0N/ARule Salv 1987 1988 - Sep lastSun 0:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
640N/A# St Martin (French part)
0N/A# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen:
0N/A# Diario Co Latino, at
0N/A# says in an article dated 2006-04-19 that the Guatemalan government had
0N/A# decided on that date to advance official time by 60 minutes, to lessen the
0N/A# impact of the elevated cost of oil.... Daylight saving time will last from
0N/A# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified).
0N/A# From Paul Eggert (2006-06-22):
0N/A# The Ministry of Energy and Mines, press release CP-15/2006
0N/A# (2006-04-19), says DST ends at 24:00. See
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Guat 1973 only - Nov 25 0:00 1:00 D
0N/ARule Guat 1974 only - Feb 24 0:00 0 S
0N/ARule Guat 1983 only - May 21 0:00 1:00 D
0N/ARule Guat 1983 only - Sep 22 0:00 0 S
0N/ARule Guat 1991 only - Mar 23 0:00 1:00 D
0N/ARule Guat 1991 only - Sep 7 0:00 0 S
0N/ARule Guat 2006 only - Apr 30 0:00 1:00 D
0N/ARule Guat 2006 only - Oct 1 0:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# From Gwillim Law (2005-04-15):
0N/A# Risto O. Nykanen wrote me that Haiti is now on DST.
0N/A# I searched for confirmation, and I found a
0N/A# on the Web page of the Haitian Consulate in Chicago (2005-03-31),
0N/A# </a>. Translated from French, it says:
0N/A# "The Prime Minister's Communication Office notifies the public in general
0N/A# and the press in particular that, following a decision of the Interior
0N/A# Ministry and the Territorial Collectivities [I suppose that means the
0N/A# provinces], Haiti will move to Eastern Daylight Time in the night from next
0N/A# Saturday the 2nd to Sunday the 3rd.
0N/A# "Consequently, the Prime Minister's Communication Office wishes to inform
0N/A# the population that the country's clocks will be set forward one hour
0N/A# starting at midnight. This provision will hold until the last Saturday in
0N/A# "Port-au-Prince, March 31, 2005"
0N/A# From Steffen Thorsen (2006-04-04):
0N/A# I have been informed by users that Haiti observes DST this year like
0N/A# last year, so the current "only" rule for 2005 might be changed to a
0N/A# "max" rule or to last until 2006. (Who knows if they will observe DST
0N/A# next year or if they will extend their DST like
US/Canada next year).
0N/A# I have found this article about it (in French):
0N/A# The reason seems to be an energy crisis.
0N/A# From Stephen Colebourne (2007-02-22):
0N/A# Some IATA info: Haiti won't be having DST in 2007.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Haiti 1983 only - May 8 0:00 1:00 D
0N/ARule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
0N/ARule Haiti 1983 1987 - Oct lastSun 0:00 0 S
0N/A# Shanks & Pottenger say AT is 2:00, but IATA SSIM (1991/1997) says 1:00s.
0N/ARule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
0N/ARule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
0N/ARule Haiti 2005 2006 - Apr Sun>=1 0:00 1:00 D
0N/ARule Haiti 2005 2006 - Oct lastSun 0:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
0N/A# Shanks & Pottenger say 1921 Jan 1; go with Whitman's more precise Apr 1.
0N/A# From Paul Eggert (2006-05-05):
0N/A# saying Honduras will start using DST midnight Saturday, effective 4
0N/A# months until September. La Tribuna reported today
0N/A# of Honduras, refused to back down on this.
0N/A# From Jesper Norgaard Welen (2006-08-08):
0N/A# It seems that Honduras has returned from DST to standard time this Monday at
0N/A# 00:00 hours (prolonging Sunday to 25 hours duration).
0N/A# From Paul Eggert (2006-08-08):
0N/A# Also see Diario El Heraldo, The country returns to standard time (2006-08-08)
0N/A# It mentions executive decree 18-2006.
0N/A# From Steffen Thorsen (2006-08-17):
0N/A# Honduras will observe DST from 2007 to 2009, exact dates are not
0N/A# published, I have located this authoritative source:
0N/A# From Steffen Thorsen (2007-03-30):
0N/A# So it seems that Honduras will not enter DST this year....
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Hond 1987 1988 - May Sun>=1 0:00 1:00 D
0N/ARule Hond 1987 1988 - Sep lastSun 0:00 0 S
0N/ARule Hond 2006 only - May Sun>=1 0:00 1:00 D
0N/ARule Hond 2006 only - Aug Mon>=1 0:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# Great Swan I ceded by US to Honduras in 1972
0N/A# From Bob Devine (1988-01-28):
0N/A# From U. S. Naval Observatory (1989-01-19):
0N/A# JAMAICA 5 H BEHIND UTC
0N/A# From Shanks & Pottenger:
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -5:07:12 - KMT 1912 Feb # Kingston Mean Time
0N/A -5:00 - EST 1974 Apr 28 2:00
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -4:04:20 - FFMT 1911 May # Fort-de-France MT
0N/A -4:00 - AST 1980 Apr 6
0N/A -4:00 1:00 ADT 1980 Sep 28
0N/A# From Paul Eggert (2006-03-22):
0N/A# In 1995 volcanic eruptions forced evacuation of Plymouth, the capital.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# This uses Shanks & Pottenger for times before 2005.
0N/A# From Steffen Thorsen (2005-04-12):
0N/A# I've got reports from 8 different people that Nicaragua just started
0N/A# DST on Sunday 2005-04-10, in order to save energy because of
0N/A# expensive petroleum. The exact end date for DST is not yet
0N/A# announced, only "September" but some sites also say "mid-September".
0N/A# Some background information is available on the President's official site:
0N/A# The Decree, no 23-2005 is available here:
0N/A# From Paul Eggert (2005-05-01):
0N/A# The decree doesn't say anything about daylight saving, but for now let's
0N/A# assume that it is daylight saving....
0N/A# From Gwillim Law (2005-04-21):
0N/A# The Associated Press story on the time change, which can be found at
0N/A# and elsewhere, says (fifth paragraph, translated from Spanish): "The last
0N/A# time that a change of clocks was applied to save energy was in the year 2000
0N/A# during the Arnoldo Aleman administration."...
0N/A# The northamerica file says that Nicaragua has been on UTC-6 continuously
0N/A# since December 1998. I wasn't able to find any details of Nicaraguan time
0N/A# changes in 2000. Perhaps a note could be added to the northamerica file, to
0N/A# the effect that we have indirect evidence that DST was observed in 2000.
0N/A# From Jesper Norgaard Welen (2005-11-02):
0N/A# Nicaragua left DST the 2005-10-02 at 00:00 (local time).
0N/A# From Jesper Norgaard Welen (2006-05-05):
0N/A# (my informal translation)
0N/A# By order of the president of the republic, Enrique Bolanos, Nicaragua
0N/A# advanced by sixty minutes their official time, yesterday at 2 in the
0N/A# morning, and will stay that way until
30.th. of september.
0N/A# From Jesper Norgaard Welen (2006-09-30):
0N/A# My informal translation runs:
0N/A# The natural sun time is restored in all the national territory, in that the
0N/A# time is returned one hour at 01:00 am of October 1 of 2006.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
0N/ARule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
0N/ARule Nic 2005 only - Apr 10 0:00 1:00 D
0N/ARule Nic 2005 only - Oct Sun>=1 0:00 0 S
0N/ARule Nic 2006 only - Apr 30 2:00 1:00 D
0N/ARule Nic 2006 only - Oct Sun>=1 1:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
0N/A -6:00 - CST 1973 May
0N/A -5:00 - EST 1975 Feb 16
0N/A -6:00 Nic C%sT 1992 Jan 1 4:00
0N/A -5:00 - EST 1992 Sep 24
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
0N/A# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -4:00 - AST 1942 May 3
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -4:04:00 - CMT 1912 # Castries Mean Time
0N/A# St Pierre and Miquelon
0N/A# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -4:00 - AST 1980 May
0N/A -3:00 - PMST 1987 # Pierre & Miquelon Time
0N/A# St Vincent and the Grenadines
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -4:04:56 - KMT 1912 # Kingstown Mean Time
0N/A# daylight saving dates for time changes have been adjusted to match
0N/A# From Brian Inglis (2007-04-28):
0N/A# there is an entry for Nov 4 "Daylight Savings Time Ends 2007" and three
0N/A# rows before that there is an out of date entry for Oct:
0N/A# "Eastern Standard Times Begins 2007
0N/A# Clocks are set back one hour at 2:00
a.m. local Daylight Saving Time"
0N/A# indicating that the normal ET rules are followed.
0N/A# From Paul Eggert (2006-05-01):
0N/A# Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998)
0N/A# says they switch at midnight. Go with Shanks & Pottenger.
0N/A# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
0N/ARule TC 1979 1986 - Apr lastSun 2:00 1:00 D
0N/ARule TC 1979 2006 - Oct lastSun 2:00 0 S
0N/ARule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D
0N/ARule TC 2007 max - Mar Sun>=8 2:00 1:00 D
0N/ARule TC 2007 max - Nov Sun>=1 2:00 0 S
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A -5:07:12 - KMT 1912 Feb # Kingston Mean Time
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
0N/A# Zone NAME GMTOFF RULES FORMAT [UNTIL]
