1# @(#)northamerica 7.63
| 1# @(#)northamerica 7.69
|
2# also includes Central America and the Caribbean
3
4# This data is by no means authoritative; if you think you know better,
5# go ahead and edit the file (and please send any changes to
6# tz@elsie.nci.nih.gov for general use in the future).
7
8# From Paul Eggert <eggert@twinsun.com> (1999-03-22):
9# A reliable and entertaining source about time zones is
10# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
11
12###############################################################################
13
14# United States
15
16# From Paul Eggert (1999-03-31):
17# Howse writes (pp 121-125) that time zones were invented by
18# Professor Charles Ferdinand Dowd (1825-1904),
19# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
20# His pamphlet ``A System of National Time for Railroads'' (1870)
21# was the result of his proposals at the Convention of Railroad Trunk Lines
22# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
23# but in 1872-05 he moved the proposed origin to Greenwich.
24# His proposal was adopted by the railroads on 1883-11-18 at 12:00,
25# and the most of the country soon followed suit.
26
27# From Paul Eggert <eggert@twinsun.com> (1995-12-19):
28# A good source for time zone historical data in the US is
29# Thomas G. Shanks, The American Atlas (5th edition),
30# San Diego: ACS Publications, Inc. (1991).
31# Make sure you have the errata sheet; the book is somewhat useless without it.
32# It is the source for the US and Puerto Rico entries below.
33
34# From Paul Eggert (2001-03-06):
35# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
36# in his whimsical essay ``An Economical Project for Diminishing the Cost
37# of Light'' published in the Journal de Paris (1784-04-26).
38# Not everyone is happy with the results:
39#
40# I don't really care how time is reckoned so long as there is some
41# agreement about it, but I object to being told that I am saving
42# daylight when my reason tells me that I am doing nothing of the kind.
43# I even object to the implication that I am wasting something
44# valuable if I stay in bed after the sun has risen. As an admirer
45# of moonlight I resent the bossy insistence of those who want to
46# reduce my time for enjoying it. At the back of the Daylight Saving
47# scheme I detect the bony, blue-fingered hand of Puritanism, eager
48# to push people into bed earlier, and get them up earlier, to make
49# them healthy, wealthy and wise in spite of themselves.
50#
51# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
52#
53# For more about the first ten years of DST in the United States, see
54# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html">
55# Ten years of daylight saving from the Pittsburgh standpoint
56# (Carnegie Library of Pittsburgh, 1927)</a>.
57#
58# Shanks says that DST was called "War Time" in the US in 1918 and 1919.
59# However, DST was imposed by the Standard Time Act of 1918, which
60# was the first nationwide legal time standard, and apparently
61# time was just called "Standard Time" or "Daylight Saving Time".
62
63# From Arthur David Olson:
64# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
65# See, for example, the front page of the Saturday, 1974-10-26
66# and Sunday, 1974-10-27 editions of the Washington Post.
67
68# From Arthur David Olson:
69# Before the Uniform Time Act of 1966 took effect in 1967, observance of
70# Daylight Saving Time in the US was by local option, except during wartime.
71
72# From Arthur David Olson (2000-09-25):
73# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
74# In the introduction, Oboler spoke of "Eastern Peace Time."
75# An AltaVista search turned up
76# <a href="http://rowayton.org/rhs/hstaug45.html">:
77# "When the time is announced over the radio now, it is 'Eastern Peace
78# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
79# </a> (August 1945) by way of confirmation.
80
81# From Joseph Gallant <notquite@hotmail.com>, citing
82# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
83# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
84# to switch to London for Attlee's address, but the American people
85# never got to hear his speech live. According to one press account,
86# CBS' Bob Trout was first to announce the word of Japan's surrender,
87# but a few seconds later, NBC, ABC and Mutual also flashed the word
88# of surrender, all of whom interrupting the bells of Big Ben in
89# London which were to precede Mr. Attlee's speech.
90
91# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
92# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
93#
94# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
95# Any announcement from Asia would reach St. John's New York newsroom on a
96# wire service teletype machine, which had prescribed signals for major news.
97# Associated Press, for example, would ring five bells before spewing out
98# typed copy of an important story, and 10 bells for news "of transcendental
99# importance."
100#
101# On Aug. 14, stalling while talking steadily into the NBC networks' open
102# microphone, St. John heard five bells and waited only to hear a sixth bell,
103# before announcing confidently: "Ladies and gentlemen, World War II is over.
104# The Japanese have agreed to our surrender terms."
105#
106# He had scored a 20-second scoop on other broadcasters.
107
108# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
109Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
110Rule US 1918 1919 - Oct lastSun 2:00 0 S
111Rule US 1942 only - Feb 9 2:00 1:00 W # War
112Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
113Rule US 1945 only - Sep 30 2:00 0 S
114Rule US 1967 max - Oct lastSun 2:00 0 S
115Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
116Rule US 1974 only - Jan 6 2:00 1:00 D
117Rule US 1975 only - Feb 23 2:00 1:00 D
118Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
119Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
120# <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:">
121# H.R.177
122# </a> (introduced 1999-01-06) would change April to March in the above rule.
123
124# From Bob Devine (1988-01-28):
125# ...Alaska (and Hawaii) had the timezone names changed in 1967.
126# old new
127# Pacific Standard Time(PST) -same-
128# Yukon Standard Time(YST) -same-
129# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
130# Nome Standard Time (NT) Bering Standard Time (BST)
131#
132# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
133# The YST zone now covers nearly all of the state, AHST just part
134# of the Aleutian islands. No DST.
135
136# From Paul Eggert (1995-12-19):
137# The tables below use `NST', not `NT', for Nome Standard Time.
138# I invented `CAWT' for Central Alaska War Time.
139
140# From U. S. Naval Observatory (1989-01-19):
141# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
142# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
143# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
144# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
145# USA MOUNTAIN 7 H BEHIND UTC DENVER
146# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
147# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
148# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
149# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
150# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
151# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
152# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
153# USA HAWAII 10 H BEHIND UTC
154# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
155
156# From Arthur David Olson (1989-01-21):
157# The above dates are for 1988.
158# Note the "AKST" and "AKDT" abbreviations, the claim that there's
159# no DST in Samoa, and the claim that there is DST in Alaska and the
160# Aleutians.
161
162# From Arthur David Olson (1988-02-13):
163# Legal standard time zone names, from United States Code (1982 Edition and
164# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
165# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
166# took effect), as explained in sections 263 and 261:
167# (none)
168# United States standard eastern time
169# United States standard mountain time
170# United States standard central time
171# United States standard Pacific time
172# (none)
173# United States standard Alaska time
174# (none)
175# Next, names from 1967-04-01 until 1983-11-30 (the date for
176# public law 98-181):
177# Atlantic standard time
178# eastern standard time
179# central standard time
180# mountain standard time
181# Pacific standard time
182# Yukon standard time
183# Alaska-Hawaii standard time
184# Bering standard time
185# And after 1983-11-30:
186# Atlantic standard time
187# eastern standard time
188# central standard time
189# mountain standard time
190# Pacific standard time
191# Alaska standard time
192# Hawaii-Aleutian standard time
193# Samoa standard time
194# The law doesn't give abbreviations.
195#
| 2# also includes Central America and the Caribbean
3
4# This data is by no means authoritative; if you think you know better,
5# go ahead and edit the file (and please send any changes to
6# tz@elsie.nci.nih.gov for general use in the future).
7
8# From Paul Eggert <eggert@twinsun.com> (1999-03-22):
9# A reliable and entertaining source about time zones is
10# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
11
12###############################################################################
13
14# United States
15
16# From Paul Eggert (1999-03-31):
17# Howse writes (pp 121-125) that time zones were invented by
18# Professor Charles Ferdinand Dowd (1825-1904),
19# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
20# His pamphlet ``A System of National Time for Railroads'' (1870)
21# was the result of his proposals at the Convention of Railroad Trunk Lines
22# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
23# but in 1872-05 he moved the proposed origin to Greenwich.
24# His proposal was adopted by the railroads on 1883-11-18 at 12:00,
25# and the most of the country soon followed suit.
26
27# From Paul Eggert <eggert@twinsun.com> (1995-12-19):
28# A good source for time zone historical data in the US is
29# Thomas G. Shanks, The American Atlas (5th edition),
30# San Diego: ACS Publications, Inc. (1991).
31# Make sure you have the errata sheet; the book is somewhat useless without it.
32# It is the source for the US and Puerto Rico entries below.
33
34# From Paul Eggert (2001-03-06):
35# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
36# in his whimsical essay ``An Economical Project for Diminishing the Cost
37# of Light'' published in the Journal de Paris (1784-04-26).
38# Not everyone is happy with the results:
39#
40# I don't really care how time is reckoned so long as there is some
41# agreement about it, but I object to being told that I am saving
42# daylight when my reason tells me that I am doing nothing of the kind.
43# I even object to the implication that I am wasting something
44# valuable if I stay in bed after the sun has risen. As an admirer
45# of moonlight I resent the bossy insistence of those who want to
46# reduce my time for enjoying it. At the back of the Daylight Saving
47# scheme I detect the bony, blue-fingered hand of Puritanism, eager
48# to push people into bed earlier, and get them up earlier, to make
49# them healthy, wealthy and wise in spite of themselves.
50#
51# -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
52#
53# For more about the first ten years of DST in the United States, see
54# Robert Garland's <a href="http://www.clpgh.org/exhibit/dst.html">
55# Ten years of daylight saving from the Pittsburgh standpoint
56# (Carnegie Library of Pittsburgh, 1927)</a>.
57#
58# Shanks says that DST was called "War Time" in the US in 1918 and 1919.
59# However, DST was imposed by the Standard Time Act of 1918, which
60# was the first nationwide legal time standard, and apparently
61# time was just called "Standard Time" or "Daylight Saving Time".
62
63# From Arthur David Olson:
64# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
65# See, for example, the front page of the Saturday, 1974-10-26
66# and Sunday, 1974-10-27 editions of the Washington Post.
67
68# From Arthur David Olson:
69# Before the Uniform Time Act of 1966 took effect in 1967, observance of
70# Daylight Saving Time in the US was by local option, except during wartime.
71
72# From Arthur David Olson (2000-09-25):
73# Last night I heard part of a rebroadcast of a 1945 Arch Oboler radio drama.
74# In the introduction, Oboler spoke of "Eastern Peace Time."
75# An AltaVista search turned up
76# <a href="http://rowayton.org/rhs/hstaug45.html">:
77# "When the time is announced over the radio now, it is 'Eastern Peace
78# Time' instead of the old familiar 'Eastern War Time.' Peace is wonderful."
79# </a> (August 1945) by way of confirmation.
80
81# From Joseph Gallant <notquite@hotmail.com>, citing
82# George H. Douglas, _The Early Days of Radio Broadcasting_ (1987):
83# At 7 P.M. (Eastern War Time) [on 1945-08-14], the networks were set
84# to switch to London for Attlee's address, but the American people
85# never got to hear his speech live. According to one press account,
86# CBS' Bob Trout was first to announce the word of Japan's surrender,
87# but a few seconds later, NBC, ABC and Mutual also flashed the word
88# of surrender, all of whom interrupting the bells of Big Ben in
89# London which were to precede Mr. Attlee's speech.
90
91# From Paul Eggert (2003-02-09): It was Robert St John, not Bob Trout. From
92# Myrna Oliver's obituary of St John on page B16 of today's Los Angeles Times:
93#
94# ... a war-weary U.S. clung to radios, awaiting word of Japan's surrender.
95# Any announcement from Asia would reach St. John's New York newsroom on a
96# wire service teletype machine, which had prescribed signals for major news.
97# Associated Press, for example, would ring five bells before spewing out
98# typed copy of an important story, and 10 bells for news "of transcendental
99# importance."
100#
101# On Aug. 14, stalling while talking steadily into the NBC networks' open
102# microphone, St. John heard five bells and waited only to hear a sixth bell,
103# before announcing confidently: "Ladies and gentlemen, World War II is over.
104# The Japanese have agreed to our surrender terms."
105#
106# He had scored a 20-second scoop on other broadcasters.
107
108# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
109Rule US 1918 1919 - Mar lastSun 2:00 1:00 D
110Rule US 1918 1919 - Oct lastSun 2:00 0 S
111Rule US 1942 only - Feb 9 2:00 1:00 W # War
112Rule US 1945 only - Aug 14 23:00u 1:00 P # Peace
113Rule US 1945 only - Sep 30 2:00 0 S
114Rule US 1967 max - Oct lastSun 2:00 0 S
115Rule US 1967 1973 - Apr lastSun 2:00 1:00 D
116Rule US 1974 only - Jan 6 2:00 1:00 D
117Rule US 1975 only - Feb 23 2:00 1:00 D
118Rule US 1976 1986 - Apr lastSun 2:00 1:00 D
119Rule US 1987 max - Apr Sun>=1 2:00 1:00 D
120# <a href="http://thomas.loc.gov/cgi-bin/bdquery/z?d106:h.r.00177:">
121# H.R.177
122# </a> (introduced 1999-01-06) would change April to March in the above rule.
123
124# From Bob Devine (1988-01-28):
125# ...Alaska (and Hawaii) had the timezone names changed in 1967.
126# old new
127# Pacific Standard Time(PST) -same-
128# Yukon Standard Time(YST) -same-
129# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
130# Nome Standard Time (NT) Bering Standard Time (BST)
131#
132# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
133# The YST zone now covers nearly all of the state, AHST just part
134# of the Aleutian islands. No DST.
135
136# From Paul Eggert (1995-12-19):
137# The tables below use `NST', not `NT', for Nome Standard Time.
138# I invented `CAWT' for Central Alaska War Time.
139
140# From U. S. Naval Observatory (1989-01-19):
141# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
142# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
143# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
144# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
145# USA MOUNTAIN 7 H BEHIND UTC DENVER
146# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
147# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
148# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
149# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
150# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
151# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
152# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
153# USA HAWAII 10 H BEHIND UTC
154# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY
155
156# From Arthur David Olson (1989-01-21):
157# The above dates are for 1988.
158# Note the "AKST" and "AKDT" abbreviations, the claim that there's
159# no DST in Samoa, and the claim that there is DST in Alaska and the
160# Aleutians.
161
162# From Arthur David Olson (1988-02-13):
163# Legal standard time zone names, from United States Code (1982 Edition and
164# Supplement III), Title 15, Chapter 6, Section 260 and forward. First, names
165# up to 1967-04-01 (when most provisions of the Uniform Time Act of 1966
166# took effect), as explained in sections 263 and 261:
167# (none)
168# United States standard eastern time
169# United States standard mountain time
170# United States standard central time
171# United States standard Pacific time
172# (none)
173# United States standard Alaska time
174# (none)
175# Next, names from 1967-04-01 until 1983-11-30 (the date for
176# public law 98-181):
177# Atlantic standard time
178# eastern standard time
179# central standard time
180# mountain standard time
181# Pacific standard time
182# Yukon standard time
183# Alaska-Hawaii standard time
184# Bering standard time
185# And after 1983-11-30:
186# Atlantic standard time
187# eastern standard time
188# central standard time
189# mountain standard time
190# Pacific standard time
191# Alaska standard time
192# Hawaii-Aleutian standard time
193# Samoa standard time
194# The law doesn't give abbreviations.
195#
|
196# From Paul Eggert (1995-12-19):
197# Shanks uses 1983-10-30, not 1983-11-30, for the 1983 transitions.
198# Go with Shanks.
199#
| |
200# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
201# Public law 106-564 (2000-12-23) introduced the abbreviation
202# "Chamorro Standard Time" for time in Guam and the Northern Marianas.
203# See the file "australasia".
204
205
206# US eastern time, represented by New York
207
208# Connecticut, Delaware, District of Columbia, most of Florida,
209# Georgia, southeast Indiana (Clark, Dearborn, Floyd, Harrison, and
210# Ohio counties), eastern Kentucky, Maine, Maryland, Massachusetts,
211# New Hampshire, New Jersey, New York, North Carolina, Ohio,
212# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
213# Vermont, Virginia, West Virginia
214
215# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
216Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
217Rule NYC 1920 only - Oct lastSun 2:00 0 S
218Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
219Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
220Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
221# Zone NAME GMTOFF RULES FORMAT [UNTIL]
222Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
223 -5:00 US E%sT 1920
224 -5:00 NYC E%sT 1942
225 -5:00 US E%sT 1946
226 -5:00 NYC E%sT 1967
227 -5:00 US E%sT
228
229# US central time, represented by Chicago
230
| 196# From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
197# Public law 106-564 (2000-12-23) introduced the abbreviation
198# "Chamorro Standard Time" for time in Guam and the Northern Marianas.
199# See the file "australasia".
200
201
202# US eastern time, represented by New York
203
204# Connecticut, Delaware, District of Columbia, most of Florida,
205# Georgia, southeast Indiana (Clark, Dearborn, Floyd, Harrison, and
206# Ohio counties), eastern Kentucky, Maine, Maryland, Massachusetts,
207# New Hampshire, New Jersey, New York, North Carolina, Ohio,
208# Pennsylvania, Rhode Island, South Carolina, eastern Tennessee,
209# Vermont, Virginia, West Virginia
210
211# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
212Rule NYC 1920 only - Mar lastSun 2:00 1:00 D
213Rule NYC 1920 only - Oct lastSun 2:00 0 S
214Rule NYC 1921 1966 - Apr lastSun 2:00 1:00 D
215Rule NYC 1921 1954 - Sep lastSun 2:00 0 S
216Rule NYC 1955 1966 - Oct lastSun 2:00 0 S
217# Zone NAME GMTOFF RULES FORMAT [UNTIL]
218Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:00
219 -5:00 US E%sT 1920
220 -5:00 NYC E%sT 1942
221 -5:00 US E%sT 1946
222 -5:00 NYC E%sT 1967
223 -5:00 US E%sT
224
225# US central time, represented by Chicago
226
|
231# Alabama, Arkansas, Florida panhandle, Illinois, western Indiana
| 227# Alabama, Arkansas, Florida panhandle (Bay, Calhoun, Escambia,
228# Gulf, Holmes, Jackson, Okaloosa, Santa Rosa, Walton, and
229# Washington counties), Illinois, western Indiana
|
232# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
233# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
234# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
235# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
236# western Tennessee, most of Texas, Wisconsin
237
238# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
239Rule Chicago 1920 only - Jun 13 2:00 1:00 D
240Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
241Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
242Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
243Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
244Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
245# Zone NAME GMTOFF RULES FORMAT [UNTIL]
246Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
247 -6:00 US C%sT 1920
248 -6:00 Chicago C%sT 1936 Mar 1 2:00
249 -5:00 - EST 1936 Nov 15 2:00
250 -6:00 Chicago C%sT 1942
251 -6:00 US C%sT 1946
252 -6:00 Chicago C%sT 1967
253 -6:00 US C%sT
254# Oliver County, ND switched from mountain to central time on 1992-10-25.
255Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:00
256 -7:00 US M%sT 1992 Oct 25 02:00
257 -6:00 US C%sT
258
259# US mountain time, represented by Denver
260#
| 230# (Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,
231# Vanderburgh, and Warrick counties), Iowa, most of Kansas, western
232# Kentucky, Louisiana, Minnesota, Mississippi, Missouri, eastern
233# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
234# western Tennessee, most of Texas, Wisconsin
235
236# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
237Rule Chicago 1920 only - Jun 13 2:00 1:00 D
238Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S
239Rule Chicago 1921 only - Mar lastSun 2:00 1:00 D
240Rule Chicago 1922 1966 - Apr lastSun 2:00 1:00 D
241Rule Chicago 1922 1954 - Sep lastSun 2:00 0 S
242Rule Chicago 1955 1966 - Oct lastSun 2:00 0 S
243# Zone NAME GMTOFF RULES FORMAT [UNTIL]
244Zone America/Chicago -5:50:36 - LMT 1883 Nov 18 12:00
245 -6:00 US C%sT 1920
246 -6:00 Chicago C%sT 1936 Mar 1 2:00
247 -5:00 - EST 1936 Nov 15 2:00
248 -6:00 Chicago C%sT 1942
249 -6:00 US C%sT 1946
250 -6:00 Chicago C%sT 1967
251 -6:00 US C%sT
252# Oliver County, ND switched from mountain to central time on 1992-10-25.
253Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:00
254 -7:00 US M%sT 1992 Oct 25 02:00
255 -6:00 US C%sT
256
257# US mountain time, represented by Denver
258#
|
261# Colorado, southern Idaho, far western Kansas, Montana, western
| 259# Colorado, far western Kansas, Montana, western
|
262# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
263# New Mexico, southwestern North Dakota, far eastern Oregon,
264# western South Dakota, far western Texas (El Paso County, Hudspeth County,
265# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
266#
267# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
268Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
269Rule Denver 1920 only - Oct lastSun 2:00 0 S
270Rule Denver 1921 only - May 22 2:00 0 S
271Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
272Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
273# Zone NAME GMTOFF RULES FORMAT [UNTIL]
274Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
275 -7:00 US M%sT 1920
276 -7:00 Denver M%sT 1942
277 -7:00 US M%sT 1946
278 -7:00 Denver M%sT 1967
279 -7:00 US M%sT
280
281# US Pacific time, represented by Los Angeles
282#
| 260# Nebraska, Nevada border (Jackpot, Owyhee, and Mountain City),
261# New Mexico, southwestern North Dakota, far eastern Oregon,
262# western South Dakota, far western Texas (El Paso County, Hudspeth County,
263# and Pine Springs and Nickel Creek in Culberson County), Utah, Wyoming
264#
265# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
266Rule Denver 1920 1921 - Mar lastSun 2:00 1:00 D
267Rule Denver 1920 only - Oct lastSun 2:00 0 S
268Rule Denver 1921 only - May 22 2:00 0 S
269Rule Denver 1965 1966 - Apr lastSun 2:00 1:00 D
270Rule Denver 1965 1966 - Oct lastSun 2:00 0 S
271# Zone NAME GMTOFF RULES FORMAT [UNTIL]
272Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00
273 -7:00 US M%sT 1920
274 -7:00 Denver M%sT 1942
275 -7:00 US M%sT 1946
276 -7:00 Denver M%sT 1967
277 -7:00 US M%sT
278
279# US Pacific time, represented by Los Angeles
280#
|
283# California, northern Idaho, most of Nevada, most of Oregon, and Washington
| 281# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
282# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties),
283# most of Nevada, most of Oregon, and Washington
|
284#
285# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
286Rule CA 1948 only - Mar 14 2:00 1:00 D
287Rule CA 1949 only - Jan 1 2:00 0 S
288Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
289Rule CA 1950 1961 - Sep lastSun 2:00 0 S
290Rule CA 1962 1966 - Oct lastSun 2:00 0 S
291# Zone NAME GMTOFF RULES FORMAT [UNTIL]
292Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
293 -8:00 US P%sT 1946
294 -8:00 CA P%sT 1967
295 -8:00 US P%sT
296
297# Alaska
298# AK%sT is the modern abbreviation for -9:00 per USNO.
299#
300# From Paul Eggert (2001-05-30):
301# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
302# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
303# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
304# also a Friday. Include only the time zone part of this transition,
305# ignoring the switch from Julian to Gregorian, since we can't represent
306# the Julian calendar.
307#
308# As far as we know, none of the exact locations mentioned below were
309# permanently inhabited in 1867 by anyone using either calendar.
310# (Yakutat was colonized by the Russians in 1799, but the settlement
311# was destroyed in 1805 by a Yakutat-kon war party.) However, there
312# were nearby inhabitants in some cases and for our purposes perhaps
313# it's best to simply use the official transition.
314#
315# Zone NAME GMTOFF RULES FORMAT [UNTIL]
316Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
317 -8:57:41 - LMT 1900 Aug 20 12:00
318 -8:00 - PST 1942
319 -8:00 US P%sT 1946
320 -8:00 - PST 1969
321 -8:00 US P%sT 1983 Oct 30 2:00
| 284#
285# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
286Rule CA 1948 only - Mar 14 2:00 1:00 D
287Rule CA 1949 only - Jan 1 2:00 0 S
288Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
289Rule CA 1950 1961 - Sep lastSun 2:00 0 S
290Rule CA 1962 1966 - Oct lastSun 2:00 0 S
291# Zone NAME GMTOFF RULES FORMAT [UNTIL]
292Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:00
293 -8:00 US P%sT 1946
294 -8:00 CA P%sT 1967
295 -8:00 US P%sT
296
297# Alaska
298# AK%sT is the modern abbreviation for -9:00 per USNO.
299#
300# From Paul Eggert (2001-05-30):
301# Howse writes that Alaska switched from the Julian to the Gregorian calendar,
302# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.
303# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,
304# also a Friday. Include only the time zone part of this transition,
305# ignoring the switch from Julian to Gregorian, since we can't represent
306# the Julian calendar.
307#
308# As far as we know, none of the exact locations mentioned below were
309# permanently inhabited in 1867 by anyone using either calendar.
310# (Yakutat was colonized by the Russians in 1799, but the settlement
311# was destroyed in 1805 by a Yakutat-kon war party.) However, there
312# were nearby inhabitants in some cases and for our purposes perhaps
313# it's best to simply use the official transition.
314#
315# Zone NAME GMTOFF RULES FORMAT [UNTIL]
316Zone America/Juneau 15:02:19 - LMT 1867 Oct 18
317 -8:57:41 - LMT 1900 Aug 20 12:00
318 -8:00 - PST 1942
319 -8:00 US P%sT 1946
320 -8:00 - PST 1969
321 -8:00 US P%sT 1983 Oct 30 2:00
|
| 322 -9:00 US Y%sT 1983 Nov 30
|
322 -9:00 US AK%sT
323Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
324 -9:18:55 - LMT 1900 Aug 20 12:00
325 -9:00 - YST 1942
326 -9:00 US Y%sT 1946
327 -9:00 - YST 1969
| 323 -9:00 US AK%sT
324Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18
325 -9:18:55 - LMT 1900 Aug 20 12:00
326 -9:00 - YST 1942
327 -9:00 US Y%sT 1946
328 -9:00 - YST 1969
|
328 -9:00 US Y%sT 1983 Oct 30 2:00
| 329 -9:00 US Y%sT 1983 Nov 30
|
329 -9:00 US AK%sT
330Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
331 -9:59:36 - LMT 1900 Aug 20 12:00
332 -10:00 - CAT 1942
333 -10:00 US CAT/CAWT 1946
334 -10:00 - CAT 1967 Apr
335 -10:00 - AHST 1969
336 -10:00 US AH%sT 1983 Oct 30 2:00
| 330 -9:00 US AK%sT
331Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18
332 -9:59:36 - LMT 1900 Aug 20 12:00
333 -10:00 - CAT 1942
334 -10:00 US CAT/CAWT 1946
335 -10:00 - CAT 1967 Apr
336 -10:00 - AHST 1969
337 -10:00 US AH%sT 1983 Oct 30 2:00
|
| 338 -9:00 US Y%sT 1983 Nov 30
|
337 -9:00 US AK%sT
338Zone America/Nome 12:58:21 - LMT 1867 Oct 18
339 -11:01:38 - LMT 1900 Aug 20 12:00
340 -11:00 - NST 1942
341 -11:00 US N%sT 1946
342 -11:00 - NST 1967 Apr
343 -11:00 - BST 1969
344 -11:00 US B%sT 1983 Oct 30 2:00
| 339 -9:00 US AK%sT
340Zone America/Nome 12:58:21 - LMT 1867 Oct 18
341 -11:01:38 - LMT 1900 Aug 20 12:00
342 -11:00 - NST 1942
343 -11:00 US N%sT 1946
344 -11:00 - NST 1967 Apr
345 -11:00 - BST 1969
346 -11:00 US B%sT 1983 Oct 30 2:00
|
| 347 -9:00 US Y%sT 1983 Nov 30
|
345 -9:00 US AK%sT
346Zone America/Adak 12:13:21 - LMT 1867 Oct 18
347 -11:46:38 - LMT 1900 Aug 20 12:00
348 -11:00 - NST 1942
349 -11:00 US N%sT 1946
350 -11:00 - NST 1967 Apr
351 -11:00 - BST 1969
352 -11:00 US B%sT 1983 Oct 30 2:00
| 348 -9:00 US AK%sT
349Zone America/Adak 12:13:21 - LMT 1867 Oct 18
350 -11:46:38 - LMT 1900 Aug 20 12:00
351 -11:00 - NST 1942
352 -11:00 US N%sT 1946
353 -11:00 - NST 1967 Apr
354 -11:00 - BST 1969
355 -11:00 US B%sT 1983 Oct 30 2:00
|
| 356 -10:00 US AH%sT 1983 Nov 30
|
353 -10:00 US HA%sT
354# Shanks writes that part of southwest Alaska (e.g. Aniak)
355# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
356# and another part (e.g. Akiak) made the same switch five weeks later.
357# These switches don't quite make our 1970 cutoff.
358
359# Hawaii
360#
361# From Arthur David Olson:
362# And then there's Hawaii.
363# DST was observed for one day in 1933;
364# standard time was changed by half an hour in 1947;
365# it's always standard as of 1986.
366#
367# From Paul Eggert:
368# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
369#
370Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
371 -10:30 - HST 1933 Apr 30 2:00
372 -10:30 1:00 HDT 1933 May 21 2:00
373 -10:30 US H%sT 1947 Jun 8 2:00
374 -10:00 - HST
375
376# Now we turn to US areas that have diverged from the consensus since 1970.
377
378# Arizona mostly uses MST.
379
380# From Paul Eggert (2002-10-20):
381#
382# The information in the rest of this paragraph is derived from the
383# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
384# Daylight Saving Time web page (2002-01-23)</a> maintained by the
385# Arizona State Library, Archives and Public Records.
386# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
387# time, but by federal law railroads, airlines, bus lines, military
388# personnel, and some engaged in interstate commerce continued to
389# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
390# Gazette says that was the date the law changed, and that 04-01 was
391# the date the state's clocks would change. In 1945 the State of
392# Arizona used standard time all year, again with exceptions only as
393# mandated by federal law. Arizona observed DST in 1967, but Arizona
394# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
395#
396# Shanks says the 1944 experiment came to an end on 1944-03-17.
397# Go with the Arizona State Library instead.
398
399Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
400 -7:00 US M%sT 1944 Jan 1 00:01
401 -7:00 - MST 1944 Apr 1 00:01
402 -7:00 US M%sT 1944 Oct 1 00:01
403 -7:00 - MST 1967
404 -7:00 US M%sT 1968 Mar 21
405 -7:00 - MST
406# From Arthur David Olson (1988-02-13):
407# A writer from the Inter Tribal Council of Arizona, Inc.,
| 357 -10:00 US HA%sT
358# Shanks writes that part of southwest Alaska (e.g. Aniak)
359# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,
360# and another part (e.g. Akiak) made the same switch five weeks later.
361# These switches don't quite make our 1970 cutoff.
362
363# Hawaii
364#
365# From Arthur David Olson:
366# And then there's Hawaii.
367# DST was observed for one day in 1933;
368# standard time was changed by half an hour in 1947;
369# it's always standard as of 1986.
370#
371# From Paul Eggert:
372# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.
373#
374Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00
375 -10:30 - HST 1933 Apr 30 2:00
376 -10:30 1:00 HDT 1933 May 21 2:00
377 -10:30 US H%sT 1947 Jun 8 2:00
378 -10:00 - HST
379
380# Now we turn to US areas that have diverged from the consensus since 1970.
381
382# Arizona mostly uses MST.
383
384# From Paul Eggert (2002-10-20):
385#
386# The information in the rest of this paragraph is derived from the
387# <a href="http://www.dlapr.lib.az.us/links/daylight.htm">
388# Daylight Saving Time web page (2002-01-23)</a> maintained by the
389# Arizona State Library, Archives and Public Records.
390# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard
391# time, but by federal law railroads, airlines, bus lines, military
392# personnel, and some engaged in interstate commerce continued to
393# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix
394# Gazette says that was the date the law changed, and that 04-01 was
395# the date the state's clocks would change. In 1945 the State of
396# Arizona used standard time all year, again with exceptions only as
397# mandated by federal law. Arizona observed DST in 1967, but Arizona
398# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
399#
400# Shanks says the 1944 experiment came to an end on 1944-03-17.
401# Go with the Arizona State Library instead.
402
403Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 12:00
404 -7:00 US M%sT 1944 Jan 1 00:01
405 -7:00 - MST 1944 Apr 1 00:01
406 -7:00 US M%sT 1944 Oct 1 00:01
407 -7:00 - MST 1967
408 -7:00 US M%sT 1968 Mar 21
409 -7:00 - MST
410# From Arthur David Olson (1988-02-13):
411# A writer from the Inter Tribal Council of Arizona, Inc.,
|
408# notes in private correspondence dated 12/28/87 that "Presently, only the
| 412# notes in private correspondence dated 1987-12-28 that "Presently, only the
|
409# Navajo Nation participates in the Daylight Saving Time policy, due to its
410# large size and location in three states." (The "only" means that other
411# tribal nations don't use DST.)
412
413Link America/Denver America/Shiprock
414
| 413# Navajo Nation participates in the Daylight Saving Time policy, due to its
414# large size and location in three states." (The "only" means that other
415# tribal nations don't use DST.)
416
417Link America/Denver America/Shiprock
418
|
415# Southern Idaho and eastern Oregon switched four weeks late in 1974.
| 419# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
420# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
421# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,
422# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
423# Teton, Twin Falls, Valley, Washington counties) and eastern Oregon
424# switched four weeks late in 1974.
425#
|
416# Zone NAME GMTOFF RULES FORMAT [UNTIL]
417Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
418 -8:00 US P%sT 1923 May 13 2:00
419 -7:00 US M%sT 1974
420 -7:00 - MST 1974 Feb 3 2:00
421 -7:00 US M%sT
422
423# Indiana
424#
425# For a map of Indiana's time zone regions, see:
426# <a href="http://www.mccsc.edu/time.html">
427# What time is it in Indiana?
428# </a> (1999-04-06)
429#
430# From Paul Eggert (1995-12-19):
431# Indiana generally observes either EST all year, or CST/CDT,
432# but areas near Cincinnati and Louisville use those cities' timekeeping
433# and in 1969 and 1970 the whole state observed daylight time;
434# and there are other exceptions as noted below.
435# Shanks partitions Indiana into 345 regions, each with its own time history,
436# and writes ``Even newspaper reports present contradictory information.''
437# Fortunately, most of the complexity occurred before our cutoff date of 1970.
438#
439# Since 1970, EST-only Indiana has been like America/Indianapolis,
440# with exceptions noted below for Crawford, Starke, and Switzerland counties.
441# The parts of Indiana not listed below have been like America/Chicago,
442# America/Louisville, or America/New_York.
443#
444# Other than Indianapolis, the Indiana place names are so nondescript
445# that they would be ambiguous if we left them at the `America' level.
446# So we reluctantly put them all in a subdirectory `America/Indiana'.
447#
448# Most of EST-only Indiana last observed DST in 1970.
449
450# From Paul Eggert (2001-03-06), following a tip by Markus Kuhn:
451# Pam Belluck reported in the New York Times (2001-01-31) that the
452# Indiana Legislature is considering a bill to adopt DST statewide.
453# Her article mentioned Vevay, whose post office observes a different
454# time zone from Danner's Hardware across the street.
455
456# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
457Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
458Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
459Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
460# Zone NAME GMTOFF RULES FORMAT [UNTIL]
461Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
462 -6:00 US C%sT 1920
463 -6:00 Indianapolis C%sT 1942
464 -6:00 US C%sT 1946
465 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
466 -5:00 - EST 1957 Sep 29 2:00
467 -6:00 - CST 1958 Apr 27 2:00
468 -5:00 - EST 1969
469 -5:00 US E%sT 1971
470 -5:00 - EST
471Link America/Indianapolis America/Indiana/Indianapolis
472#
473# Part of Crawford County, Indiana, last observed DST in 1975,
474# and left its clocks alone in 1974.
475# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
476Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
477Rule Marengo 1951 only - Sep lastSun 2:00 0 S
478Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
479Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
480# Zone NAME GMTOFF RULES FORMAT [UNTIL]
481Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
482 -6:00 US C%sT 1951
483 -6:00 Marengo C%sT 1961 Apr 30 2:00
484 -5:00 - EST 1969
485 -5:00 US E%sT 1974 Jan 6 2:00
486 -6:00 1:00 CDT 1974 Oct 27 2:00
487 -5:00 US E%sT 1976
488 -5:00 - EST
489#
490# Starke County, Indiana
491# From Arthur David Olson (1991-10-28):
492# An article on page A3 of the Sunday, 1991-10-27 Washington Post
493# notes that Starke County switched from Central time to Eastern time as of
494# 1991-10-27.
495# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
496Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
497Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
498Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
499Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
500Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
501# Zone NAME GMTOFF RULES FORMAT [UNTIL]
502Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
503 -6:00 US C%sT 1947
504 -6:00 Starke C%sT 1962 Apr 29 2:00
505 -5:00 - EST 1963 Oct 27 2:00
506 -6:00 US C%sT 1991 Oct 27 2:00
507 -5:00 - EST
508#
509# Switzerland County, Indiana, last observed DST in 1972.
510# Zone NAME GMTOFF RULES FORMAT [UNTIL]
511Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
512 -6:00 US C%sT 1954 Apr 25 2:00
513 -5:00 - EST 1969
514 -5:00 US E%sT 1973
515 -5:00 - EST
516
517# Part of Kentucky left its clocks alone in 1974.
518# This also includes a part of Indiana immediately adjacent to Louisville.
519# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
520Rule Louisville 1921 only - May 1 2:00 1:00 D
521Rule Louisville 1921 only - Sep 1 2:00 0 S
522Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
523Rule Louisville 1941 only - Sep lastSun 2:00 0 S
524Rule Louisville 1946 only - Jun 2 2:00 0 S
525Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
526Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
527# Zone NAME GMTOFF RULES FORMAT [UNTIL]
528Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
529 -6:00 US C%sT 1921
530 -6:00 Louisville C%sT 1942
531 -6:00 US C%sT 1946
532 -6:00 Louisville C%sT 1961 Jul 23 2:00
533 -5:00 - EST 1968
534 -5:00 US E%sT 1974 Jan 6 2:00
535 -6:00 1:00 CDT 1974 Oct 27 2:00
536 -5:00 US E%sT
537Link America/Louisville America/Kentucky/Louisville
538#
539# Wayne, Clinton, and Russell Counties, Kentucky
540#
541# From
542# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
543# Lake Cumberland LIFE
544# </a> (1999-01-29) via WKYM-101.7:
545# Clinton County has joined Wayne County in asking the DoT to change from
546# the Central to the Eastern time zone.... The Wayne County government made
547# the same request in December. And while Russell County officials have not
548# taken action, the majority of respondents to a poll conducted there in
549# August indicated they would like to change to "fast time" also.
550# The three Lake Cumberland counties are the farthest east of any U.S.
551# location in the Central time zone.
552#
553# From Rich Wales (2000-08-29):
554# After prolonged debate, and despite continuing deep differences of opinion,
555# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
556# (-0500) time. They won't "fall back" this year. See Sara Shipley,
557# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
558#
559# From Paul Eggert (2001-07-16):
560# The final rule was published in the
561# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
562# Federal Register 65, 160 (2000-08-17), page 50154-50158.
563# </a>
564#
565Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:00
566 -6:00 US C%sT 1946
567 -6:00 - CST 1968
568 -6:00 US C%sT 2000 Oct 29 2:00
569 -5:00 US E%sT
570
571
572# From Rives McDow (2000-08-30):
573# Here ... are all the changes in the US since 1985.
574# Kearny County, KS (put all of county on central;
575# previously split between MST and CST) ... 1990-10
576# Starke County, IN (from CST to EST) ... 1991-10
577# Oliver County, ND (from MST to CST) ... 1992-10
578# West Wendover, NV (from PST TO MST) ... 1999-10
579# Wayne County, KY (from CST to EST) ... 2000-10
580#
581# From Paul Eggert (2001-07-17):
582# We don't know where the line used to be within Kearny County, KS,
583# so omit that change for now.
584# See America/Indiana/Knox for the Starke County, IN change.
585# See America/North_Dakota/Center for the Oliver County, ND change.
586# West Wendover, NV officially switched from Pacific to mountain time on
587# 1999-10-31. See the
588# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
589# Federal Register 64, 203 (1999-10-21), page 56705-56707.
590# </a>
591# However, the Federal Register says that West Wendover already operated
592# on mountain time, and the rule merely made this official;
593# hence a separate tz entry is not needed.
594
595# Michigan
596#
597# From Bob Devine (1988-01-28):
598# Michigan didn't observe DST from 1968 to 1973.
599#
600# From Paul Eggert (1999-03-31):
601# Shanks writes that Michigan started using standard time on 1885-09-18,
602# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
603# that Detroit kept
604#
605# local time until 1900 when the City Council decreed that clocks should
606# be put back twenty-eight minutes to Central Standard Time. Half the
607# city obeyed, half refused. After considerable debate, the decision
608# was rescinded and the city reverted to Sun time. A derisive offer to
609# erect a sundial in front of the city hall was referred to the
610# Committee on Sewers. Then, in 1905, Central time was adopted
611# by city vote.
612#
613# This story is too entertaining to be false, so go with Howse over Shanks.
614#
615# From Paul Eggert (2001-03-06):
616# Garland (1927) writes ``Cleveland and Detroit advanced their clocks
617# one hour in 1914.'' This change is not in Shanks. We have no more
618# info, so omit this for now.
619#
620# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
621# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
622Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
623Rule Detroit 1948 only - Sep lastSun 2:00 0 S
624Rule Detroit 1967 only - Jun 14 2:00 1:00 D
625Rule Detroit 1967 only - Oct lastSun 2:00 0 S
626# Zone NAME GMTOFF RULES FORMAT [UNTIL]
627Zone America/Detroit -5:32:11 - LMT 1905
628 -6:00 - CST 1915 May 15 2:00
629 -5:00 - EST 1942
630 -5:00 US E%sT 1946
631 -5:00 Detroit E%sT 1973
632 -5:00 US E%sT 1975
633 -5:00 - EST 1975 Apr 27 2:00
634 -5:00 US E%sT
635#
636# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
637# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
638Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
639Rule Menominee 1946 only - Sep lastSun 2:00 0 S
640Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
641Rule Menominee 1966 only - Oct lastSun 2:00 0 S
642# Zone NAME GMTOFF RULES FORMAT [UNTIL]
643Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
644 -6:00 US C%sT 1946
645 -6:00 Menominee C%sT 1969 Apr 27 2:00
646 -5:00 - EST 1973 Apr 29 2:00
647 -6:00 US C%sT
648
649# Navassa
650# administered by the US Fish and Wildlife Service
651# claimed by US under the provisions of the 1856 Guano Islands Act
652# also claimed by Haiti
653# occupied 1857/1900 by the Navassa Phosphate Co
654# US lighthouse 1917/1996-09
655# currently uninhabited
656# see Mark Fineman, ``An Isle Rich in Guano and Discord'',
657# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
658# Jimmy Skaggs, _The Great Guano Rush_ (1994).
659
660# Old names, for S5 users
661
662# Link LINK-FROM LINK-TO
663Link America/New_York EST5EDT
664Link America/Chicago CST6CDT
665Link America/Denver MST7MDT
666Link America/Los_Angeles PST8PDT
667Link America/Indianapolis EST
668Link America/Phoenix MST
669Link Pacific/Honolulu HST
670
671################################################################################
672
673
674# From Paul Eggert <eggert@twinsun.com> (1999-10-29):
675# A good source for time zone historical data outside the US is
676# Thomas G. Shanks, The International Atlas (5th edition),
677# San Diego: ACS Publications, Inc. (1999).
678#
679# Gwillim Law writes that a good source
680# for recent time zone data is the International Air Transport
681# Association's Standard Schedules Information Manual (IATA SSIM),
682# published semiannually. Law sent in several helpful summaries
683# of the IATA's data after 1990.
684#
685# Except where otherwise noted, Shanks is the source for entries through 1990,
686# and IATA SSIM is the source for entries after 1990.
687#
688# Other sources occasionally used include:
689#
690# Edward W. Whitman, World Time Differences,
691# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
692# which I found in the UCLA library.
693#
694# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
695# William Willett, The Waste of Daylight, 19th edition
696# </a> (1914-03)
697#
698# See the `europe' file for Greenland.
699
700# Canada
701
702# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
703# I post here the time zone abbreviations standardized in Canada
704# for both English and French in the CAN/CSA-Z234.4-89 standard....
705#
706# UTC Standard time Daylight savings time
707# offset French English French English
708# -2:30 - - HAT NDT
709# -3 - - HAA ADT
710# -3:30 HNT NST - -
711# -4 HNA AST HAE EDT
712# -5 HNE EST HAC CDT
713# -6 HNC CST HAR MDT
714# -7 HNR MST HAP PDT
715# -8 HNP PST HAY YDT
716# -9 HNY YST - -
717#
718# HN: Heure Normale ST: Standard Time
719# HA: Heure Avanc<e'>e DT: Daylight saving Time
720#
721# A: de l'Atlantique Atlantic
722# C: du Centre Central
723# E: de l'Est Eastern
724# M: Mountain
725# N: Newfoundland
726# P: du Pacifique Pacific
727# R: des Rocheuses
728# T: de Terre-Neuve
729# Y: du Yukon Yukon
730#
731# From Paul Eggert <eggert@twinsun.com> (1994-11-22):
732# Alas, this sort of thing must be handled by localization software.
733
734# Unless otherwise specified, the data for Canada are all from Shanks.
735
736# From Paul Eggert (2000-10-02):
737# H. David Matthews and Mary Vincent's map
738# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm">
739# "It's about TIME", _Canadian Geographic_ (September-October 1998)
740# </a> contains detailed boundaries for regions observing nonstandard
741# time and daylight saving time arrangements in Canada circa 1998.
742#
743# INMS, the Institute for National Measurement Standards in Ottawa, has
744# <a href="http://www.nrc.ca/inms/time/tze.html">
745# information about standard and daylight saving time zones in Canada.
746# </a> (updated periodically).
747# Its unofficial information is often taken from Matthews and Vincent.
748
749# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
750Rule Canada 1918 only - Apr 14 2:00 1:00 D
751Rule Canada 1918 only - Oct 31 2:00 0 S
752Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
753Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
754Rule Canada 1945 only - Sep 30 2:00 0 S
755Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
756Rule Canada 1974 max - Oct lastSun 2:00 0 S
757Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
758
759
760# Newfoundland (and far southeast Labrador)
761
762# From Paul Eggert (2000-10-02):
763# Matthews and Vincent (1998) write that Labrador should use NST/NDT,
764# but the only part of Labrador that follows the rules is the
765# southeast corner, including Port Hope Simpson and Mary's Harbour,
766# but excluding, say, Black Tickle.
767
768# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
769Rule StJohns 1917 only - Apr 8 2:00 1:00 D
770Rule StJohns 1917 only - Sep 17 2:00 0 S
771# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
772Rule StJohns 1919 only - May 5 23:00 1:00 D
773Rule StJohns 1919 only - Aug 12 23:00 0 S
774# For 1931-1935 Whitman gives Apr same date; go with Shanks.
775Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
776Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
777# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks.
778Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
779Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
780# Whitman gives the following transitions:
781# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
782# but go with Shanks and assume they used Canadian rules.
783# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
784# Apr 30 - Sep 24; go with Shanks.
785Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
786Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
787Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
788Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
789Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
790# From Paul Eggert (2000-10-02):
791# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
792# at 00:01 local time. For now, assume it started in 1987.
793Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
794Rule StJohns 1987 max - Oct lastSun 0:01 0 S
795Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
796Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D
797# St John's has an apostrophe, but Posix file names can't have apostrophes.
798# Zone NAME GMTOFF RULES FORMAT [UNTIL]
799Zone America/St_Johns -3:30:52 - LMT 1884
800 -3:30:52 StJohns N%sT 1918
801 -3:30:52 Canada N%sT 1919
802 -3:30:52 StJohns N%sT 1935 Mar 30
803 -3:30 StJohns N%sT 1942 May 11
804 -3:30 Canada N%sT 1946
805 -3:30 StJohns N%sT
806
807# most of east Labrador
808
809# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
810# Zone NAME GMTOFF RULES FORMAT [UNTIL]
811Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
812 -3:30:52 - NST 1918
813 -3:30:52 Canada N%sT 1919
814 -3:30:52 - NST 1935 Mar 30
815 -3:30 - NST 1936
816 -3:30 StJohns N%sT 1942 May 11
817 -3:30 Canada N%sT 1946
818 -3:30 StJohns N%sT 1966 Mar 15 2:00
819 -4:00 StJohns A%sT
820
821
822# west Labrador, New Brunswick, Nova Scotia, Prince Edward I
823
824# From Paul Eggert (1996-06-12):
825# Shanks writes that since 1970 most of this region has been like Halifax.
826# Many locales did not observe peacetime DST until 1972;
827# Glace Bay, NS is the largest that we know of.
828# Shanks also writes that Liverpool, NS was the only town in Canada to observe
829# DST in 1971 but not 1970; for now we'll assume this is a typo.
830
831# From Paul Eggert (2000-10-02):
832# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches
833# at 00:01 local time. FIXME: verify and create a new Zone for this.
834
835
836# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
837Rule Halifax 1916 only - Apr 1 0:00 1:00 D
838Rule Halifax 1916 only - Oct 1 0:00 0 S
839Rule Halifax 1920 only - May 9 0:00 1:00 D
840Rule Halifax 1920 only - Aug 29 0:00 0 S
841Rule Halifax 1921 only - May 6 0:00 1:00 D
842Rule Halifax 1921 1922 - Sep 5 0:00 0 S
843Rule Halifax 1922 only - Apr 30 0:00 1:00 D
844Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
845Rule Halifax 1923 only - Sep 4 0:00 0 S
846Rule Halifax 1924 only - Sep 15 0:00 0 S
847Rule Halifax 1925 only - Sep 28 0:00 0 S
848Rule Halifax 1926 only - May 16 0:00 1:00 D
849Rule Halifax 1926 only - Sep 13 0:00 0 S
850Rule Halifax 1927 only - May 1 0:00 1:00 D
851Rule Halifax 1927 only - Sep 26 0:00 0 S
852Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
853Rule Halifax 1928 only - Sep 9 0:00 0 S
854Rule Halifax 1929 only - Sep 3 0:00 0 S
855Rule Halifax 1930 only - Sep 15 0:00 0 S
856Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
857Rule Halifax 1932 only - May 1 0:00 1:00 D
858Rule Halifax 1933 only - Apr 30 0:00 1:00 D
859Rule Halifax 1933 only - Oct 2 0:00 0 S
860Rule Halifax 1934 only - May 20 0:00 1:00 D
861Rule Halifax 1934 only - Sep 16 0:00 0 S
862Rule Halifax 1935 only - Jun 2 0:00 1:00 D
863Rule Halifax 1935 only - Sep 30 0:00 0 S
864Rule Halifax 1936 only - Jun 1 0:00 1:00 D
865Rule Halifax 1936 only - Sep 14 0:00 0 S
866Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
867Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
868Rule Halifax 1939 only - May 28 0:00 1:00 D
869Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
870Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
871Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
872Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
873Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
874Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
875Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
876Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
877Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
878# Zone NAME GMTOFF RULES FORMAT [UNTIL]
879Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
880 -4:00 Halifax A%sT 1918
881 -4:00 Canada A%sT 1919
882 -4:00 Halifax A%sT 1942 Feb 9 2:00s
883 -4:00 Canada A%sT 1946
884 -4:00 Halifax A%sT 1974
885 -4:00 Canada A%sT
886Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
887 -4:00 Canada A%sT 1953
888 -4:00 Halifax A%sT 1954
889 -4:00 - AST 1972
890 -4:00 Halifax A%sT 1974
891 -4:00 Canada A%sT
892
893
894# Ontario, Quebec
895
896# From Paul Eggert (1996-06-12):
897# Shanks writes that since 1970 most of Ontario has been like Toronto,
898# and most of Quebec has been like Montreal.
899# Thunder Bay skipped DST in 1973.
900# Many smaller locales did not observe peacetime DST until 1974;
901# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
902# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
903
904# From Mark Brader (2003-07-26):
905# [According to the Toronto Star] Orillia, Ontario, adopted DST
906# effective Saturday, 1912-06-22, 22:00; the article mentions that
907# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
908# have already done so. In Orillia DST was to run until Saturday,
909# 1912-08-31 (no time mentioned), but it was met with considerable
910# hostility from certain segments of the public, and was revoked after
911# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
912# presumably that should be -07-06. (1912-06-19, -07-12; also letters
913# earlier in June).
914#
915# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
916
917# From Paul Eggert (1997-10-17):
918# Mark Brader writes that an article in the 1997-10-14 Toronto Star
919# says that Atikokan, Ontario currently does not observe DST,
920# but will vote on 11-10 whether to use EST/EDT.
921# He also writes that the
922# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
923# Ontario Time Act (1990, Chapter T.9)
924# </a>
925# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
926# Officially Atikokan is therefore on CST/CDT, and most likely this report
927# concerns a non-official time observed as a matter of local practice.
928# For what it's worth, Shanks says that Atikokan has agreed with
929# Rainy River ever since standard time was introduced.
930
931# From Paul Eggert (2000-10-02):
932# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
933# New Osnaburgh observe CST all year, that Big Trout Lake observes
934# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
935# violation of the official Ontario rules.
936# They also write that Quebec east of the -63 meridian is supposed to
937# observe AST, but residents as far east as Natashquan use EST/EDT,
938# and residents east of Natashquan use AST.
939# We probably need Zones for far east Quebec and for Atikokan,
940# but we don't know when their practices started.
941
942# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
943Rule Mont 1917 only - Mar 25 2:00 1:00 D
944Rule Mont 1917 only - Apr 24 0:00 0 S
945Rule Mont 1919 only - Mar 31 2:30 1:00 D
946Rule Mont 1919 only - Oct 25 2:30 0 S
947Rule Mont 1920 only - May 2 2:30 1:00 D
948Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
949Rule Mont 1921 only - May 1 2:00 1:00 D
950Rule Mont 1922 only - Apr 30 2:00 1:00 D
951Rule Mont 1924 only - May 17 2:00 1:00 D
952Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
953Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
| 426# Zone NAME GMTOFF RULES FORMAT [UNTIL]
427Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:00
428 -8:00 US P%sT 1923 May 13 2:00
429 -7:00 US M%sT 1974
430 -7:00 - MST 1974 Feb 3 2:00
431 -7:00 US M%sT
432
433# Indiana
434#
435# For a map of Indiana's time zone regions, see:
436# <a href="http://www.mccsc.edu/time.html">
437# What time is it in Indiana?
438# </a> (1999-04-06)
439#
440# From Paul Eggert (1995-12-19):
441# Indiana generally observes either EST all year, or CST/CDT,
442# but areas near Cincinnati and Louisville use those cities' timekeeping
443# and in 1969 and 1970 the whole state observed daylight time;
444# and there are other exceptions as noted below.
445# Shanks partitions Indiana into 345 regions, each with its own time history,
446# and writes ``Even newspaper reports present contradictory information.''
447# Fortunately, most of the complexity occurred before our cutoff date of 1970.
448#
449# Since 1970, EST-only Indiana has been like America/Indianapolis,
450# with exceptions noted below for Crawford, Starke, and Switzerland counties.
451# The parts of Indiana not listed below have been like America/Chicago,
452# America/Louisville, or America/New_York.
453#
454# Other than Indianapolis, the Indiana place names are so nondescript
455# that they would be ambiguous if we left them at the `America' level.
456# So we reluctantly put them all in a subdirectory `America/Indiana'.
457#
458# Most of EST-only Indiana last observed DST in 1970.
459
460# From Paul Eggert (2001-03-06), following a tip by Markus Kuhn:
461# Pam Belluck reported in the New York Times (2001-01-31) that the
462# Indiana Legislature is considering a bill to adopt DST statewide.
463# Her article mentioned Vevay, whose post office observes a different
464# time zone from Danner's Hardware across the street.
465
466# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
467Rule Indianapolis 1941 only - Jun 22 2:00 1:00 D
468Rule Indianapolis 1941 1954 - Sep lastSun 2:00 0 S
469Rule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D
470# Zone NAME GMTOFF RULES FORMAT [UNTIL]
471Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
472 -6:00 US C%sT 1920
473 -6:00 Indianapolis C%sT 1942
474 -6:00 US C%sT 1946
475 -6:00 Indianapolis C%sT 1955 Apr 24 2:00
476 -5:00 - EST 1957 Sep 29 2:00
477 -6:00 - CST 1958 Apr 27 2:00
478 -5:00 - EST 1969
479 -5:00 US E%sT 1971
480 -5:00 - EST
481Link America/Indianapolis America/Indiana/Indianapolis
482#
483# Part of Crawford County, Indiana, last observed DST in 1975,
484# and left its clocks alone in 1974.
485# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
486Rule Marengo 1951 only - Apr lastSun 2:00 1:00 D
487Rule Marengo 1951 only - Sep lastSun 2:00 0 S
488Rule Marengo 1954 1960 - Apr lastSun 2:00 1:00 D
489Rule Marengo 1954 1960 - Sep lastSun 2:00 0 S
490# Zone NAME GMTOFF RULES FORMAT [UNTIL]
491Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:00
492 -6:00 US C%sT 1951
493 -6:00 Marengo C%sT 1961 Apr 30 2:00
494 -5:00 - EST 1969
495 -5:00 US E%sT 1974 Jan 6 2:00
496 -6:00 1:00 CDT 1974 Oct 27 2:00
497 -5:00 US E%sT 1976
498 -5:00 - EST
499#
500# Starke County, Indiana
501# From Arthur David Olson (1991-10-28):
502# An article on page A3 of the Sunday, 1991-10-27 Washington Post
503# notes that Starke County switched from Central time to Eastern time as of
504# 1991-10-27.
505# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
506Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D
507Rule Starke 1947 1954 - Sep lastSun 2:00 0 S
508Rule Starke 1955 1956 - Oct lastSun 2:00 0 S
509Rule Starke 1957 1958 - Sep lastSun 2:00 0 S
510Rule Starke 1959 1961 - Oct lastSun 2:00 0 S
511# Zone NAME GMTOFF RULES FORMAT [UNTIL]
512Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:00
513 -6:00 US C%sT 1947
514 -6:00 Starke C%sT 1962 Apr 29 2:00
515 -5:00 - EST 1963 Oct 27 2:00
516 -6:00 US C%sT 1991 Oct 27 2:00
517 -5:00 - EST
518#
519# Switzerland County, Indiana, last observed DST in 1972.
520# Zone NAME GMTOFF RULES FORMAT [UNTIL]
521Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:00
522 -6:00 US C%sT 1954 Apr 25 2:00
523 -5:00 - EST 1969
524 -5:00 US E%sT 1973
525 -5:00 - EST
526
527# Part of Kentucky left its clocks alone in 1974.
528# This also includes a part of Indiana immediately adjacent to Louisville.
529# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
530Rule Louisville 1921 only - May 1 2:00 1:00 D
531Rule Louisville 1921 only - Sep 1 2:00 0 S
532Rule Louisville 1941 1961 - Apr lastSun 2:00 1:00 D
533Rule Louisville 1941 only - Sep lastSun 2:00 0 S
534Rule Louisville 1946 only - Jun 2 2:00 0 S
535Rule Louisville 1950 1955 - Sep lastSun 2:00 0 S
536Rule Louisville 1956 1960 - Oct lastSun 2:00 0 S
537# Zone NAME GMTOFF RULES FORMAT [UNTIL]
538Zone America/Louisville -5:43:02 - LMT 1883 Nov 18 12:00
539 -6:00 US C%sT 1921
540 -6:00 Louisville C%sT 1942
541 -6:00 US C%sT 1946
542 -6:00 Louisville C%sT 1961 Jul 23 2:00
543 -5:00 - EST 1968
544 -5:00 US E%sT 1974 Jan 6 2:00
545 -6:00 1:00 CDT 1974 Oct 27 2:00
546 -5:00 US E%sT
547Link America/Louisville America/Kentucky/Louisville
548#
549# Wayne, Clinton, and Russell Counties, Kentucky
550#
551# From
552# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml">
553# Lake Cumberland LIFE
554# </a> (1999-01-29) via WKYM-101.7:
555# Clinton County has joined Wayne County in asking the DoT to change from
556# the Central to the Eastern time zone.... The Wayne County government made
557# the same request in December. And while Russell County officials have not
558# taken action, the majority of respondents to a poll conducted there in
559# August indicated they would like to change to "fast time" also.
560# The three Lake Cumberland counties are the farthest east of any U.S.
561# location in the Central time zone.
562#
563# From Rich Wales (2000-08-29):
564# After prolonged debate, and despite continuing deep differences of opinion,
565# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern
566# (-0500) time. They won't "fall back" this year. See Sara Shipley,
567# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).
568#
569# From Paul Eggert (2001-07-16):
570# The final rule was published in the
571# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2000_register&docid=fr17au00-22">
572# Federal Register 65, 160 (2000-08-17), page 50154-50158.
573# </a>
574#
575Zone America/Kentucky/Monticello -5:39:24 - LMT 1883 Nov 18 12:00
576 -6:00 US C%sT 1946
577 -6:00 - CST 1968
578 -6:00 US C%sT 2000 Oct 29 2:00
579 -5:00 US E%sT
580
581
582# From Rives McDow (2000-08-30):
583# Here ... are all the changes in the US since 1985.
584# Kearny County, KS (put all of county on central;
585# previously split between MST and CST) ... 1990-10
586# Starke County, IN (from CST to EST) ... 1991-10
587# Oliver County, ND (from MST to CST) ... 1992-10
588# West Wendover, NV (from PST TO MST) ... 1999-10
589# Wayne County, KY (from CST to EST) ... 2000-10
590#
591# From Paul Eggert (2001-07-17):
592# We don't know where the line used to be within Kearny County, KS,
593# so omit that change for now.
594# See America/Indiana/Knox for the Starke County, IN change.
595# See America/North_Dakota/Center for the Oliver County, ND change.
596# West Wendover, NV officially switched from Pacific to mountain time on
597# 1999-10-31. See the
598# <a href="http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=1999_register&docid=fr21oc99-15">
599# Federal Register 64, 203 (1999-10-21), page 56705-56707.
600# </a>
601# However, the Federal Register says that West Wendover already operated
602# on mountain time, and the rule merely made this official;
603# hence a separate tz entry is not needed.
604
605# Michigan
606#
607# From Bob Devine (1988-01-28):
608# Michigan didn't observe DST from 1968 to 1973.
609#
610# From Paul Eggert (1999-03-31):
611# Shanks writes that Michigan started using standard time on 1885-09-18,
612# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01)
613# that Detroit kept
614#
615# local time until 1900 when the City Council decreed that clocks should
616# be put back twenty-eight minutes to Central Standard Time. Half the
617# city obeyed, half refused. After considerable debate, the decision
618# was rescinded and the city reverted to Sun time. A derisive offer to
619# erect a sundial in front of the city hall was referred to the
620# Committee on Sewers. Then, in 1905, Central time was adopted
621# by city vote.
622#
623# This story is too entertaining to be false, so go with Howse over Shanks.
624#
625# From Paul Eggert (2001-03-06):
626# Garland (1927) writes ``Cleveland and Detroit advanced their clocks
627# one hour in 1914.'' This change is not in Shanks. We have no more
628# info, so omit this for now.
629#
630# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
631# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
632Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D
633Rule Detroit 1948 only - Sep lastSun 2:00 0 S
634Rule Detroit 1967 only - Jun 14 2:00 1:00 D
635Rule Detroit 1967 only - Oct lastSun 2:00 0 S
636# Zone NAME GMTOFF RULES FORMAT [UNTIL]
637Zone America/Detroit -5:32:11 - LMT 1905
638 -6:00 - CST 1915 May 15 2:00
639 -5:00 - EST 1942
640 -5:00 US E%sT 1946
641 -5:00 Detroit E%sT 1973
642 -5:00 US E%sT 1975
643 -5:00 - EST 1975 Apr 27 2:00
644 -5:00 US E%sT
645#
646# The Michigan border with Wisconsin switched from EST to CST/CDT in 1973.
647# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
648Rule Menominee 1946 only - Apr lastSun 2:00 1:00 D
649Rule Menominee 1946 only - Sep lastSun 2:00 0 S
650Rule Menominee 1966 only - Apr lastSun 2:00 1:00 D
651Rule Menominee 1966 only - Oct lastSun 2:00 0 S
652# Zone NAME GMTOFF RULES FORMAT [UNTIL]
653Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
654 -6:00 US C%sT 1946
655 -6:00 Menominee C%sT 1969 Apr 27 2:00
656 -5:00 - EST 1973 Apr 29 2:00
657 -6:00 US C%sT
658
659# Navassa
660# administered by the US Fish and Wildlife Service
661# claimed by US under the provisions of the 1856 Guano Islands Act
662# also claimed by Haiti
663# occupied 1857/1900 by the Navassa Phosphate Co
664# US lighthouse 1917/1996-09
665# currently uninhabited
666# see Mark Fineman, ``An Isle Rich in Guano and Discord'',
667# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
668# Jimmy Skaggs, _The Great Guano Rush_ (1994).
669
670# Old names, for S5 users
671
672# Link LINK-FROM LINK-TO
673Link America/New_York EST5EDT
674Link America/Chicago CST6CDT
675Link America/Denver MST7MDT
676Link America/Los_Angeles PST8PDT
677Link America/Indianapolis EST
678Link America/Phoenix MST
679Link Pacific/Honolulu HST
680
681################################################################################
682
683
684# From Paul Eggert <eggert@twinsun.com> (1999-10-29):
685# A good source for time zone historical data outside the US is
686# Thomas G. Shanks, The International Atlas (5th edition),
687# San Diego: ACS Publications, Inc. (1999).
688#
689# Gwillim Law writes that a good source
690# for recent time zone data is the International Air Transport
691# Association's Standard Schedules Information Manual (IATA SSIM),
692# published semiannually. Law sent in several helpful summaries
693# of the IATA's data after 1990.
694#
695# Except where otherwise noted, Shanks is the source for entries through 1990,
696# and IATA SSIM is the source for entries after 1990.
697#
698# Other sources occasionally used include:
699#
700# Edward W. Whitman, World Time Differences,
701# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated),
702# which I found in the UCLA library.
703#
704# <a href="http://www.pettswoodvillage.co.uk/Daylight_Savings_William_Willett.pdf">
705# William Willett, The Waste of Daylight, 19th edition
706# </a> (1914-03)
707#
708# See the `europe' file for Greenland.
709
710# Canada
711
712# From Alain LaBont<e'> <ALB@immedia.ca> (1994-11-14):
713# I post here the time zone abbreviations standardized in Canada
714# for both English and French in the CAN/CSA-Z234.4-89 standard....
715#
716# UTC Standard time Daylight savings time
717# offset French English French English
718# -2:30 - - HAT NDT
719# -3 - - HAA ADT
720# -3:30 HNT NST - -
721# -4 HNA AST HAE EDT
722# -5 HNE EST HAC CDT
723# -6 HNC CST HAR MDT
724# -7 HNR MST HAP PDT
725# -8 HNP PST HAY YDT
726# -9 HNY YST - -
727#
728# HN: Heure Normale ST: Standard Time
729# HA: Heure Avanc<e'>e DT: Daylight saving Time
730#
731# A: de l'Atlantique Atlantic
732# C: du Centre Central
733# E: de l'Est Eastern
734# M: Mountain
735# N: Newfoundland
736# P: du Pacifique Pacific
737# R: des Rocheuses
738# T: de Terre-Neuve
739# Y: du Yukon Yukon
740#
741# From Paul Eggert <eggert@twinsun.com> (1994-11-22):
742# Alas, this sort of thing must be handled by localization software.
743
744# Unless otherwise specified, the data for Canada are all from Shanks.
745
746# From Paul Eggert (2000-10-02):
747# H. David Matthews and Mary Vincent's map
748# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm">
749# "It's about TIME", _Canadian Geographic_ (September-October 1998)
750# </a> contains detailed boundaries for regions observing nonstandard
751# time and daylight saving time arrangements in Canada circa 1998.
752#
753# INMS, the Institute for National Measurement Standards in Ottawa, has
754# <a href="http://www.nrc.ca/inms/time/tze.html">
755# information about standard and daylight saving time zones in Canada.
756# </a> (updated periodically).
757# Its unofficial information is often taken from Matthews and Vincent.
758
759# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
760Rule Canada 1918 only - Apr 14 2:00 1:00 D
761Rule Canada 1918 only - Oct 31 2:00 0 S
762Rule Canada 1942 only - Feb 9 2:00 1:00 W # War
763Rule Canada 1945 only - Aug 14 23:00u 1:00 P # Peace
764Rule Canada 1945 only - Sep 30 2:00 0 S
765Rule Canada 1974 1986 - Apr lastSun 2:00 1:00 D
766Rule Canada 1974 max - Oct lastSun 2:00 0 S
767Rule Canada 1987 max - Apr Sun>=1 2:00 1:00 D
768
769
770# Newfoundland (and far southeast Labrador)
771
772# From Paul Eggert (2000-10-02):
773# Matthews and Vincent (1998) write that Labrador should use NST/NDT,
774# but the only part of Labrador that follows the rules is the
775# southeast corner, including Port Hope Simpson and Mary's Harbour,
776# but excluding, say, Black Tickle.
777
778# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
779Rule StJohns 1917 only - Apr 8 2:00 1:00 D
780Rule StJohns 1917 only - Sep 17 2:00 0 S
781# Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks.
782Rule StJohns 1919 only - May 5 23:00 1:00 D
783Rule StJohns 1919 only - Aug 12 23:00 0 S
784# For 1931-1935 Whitman gives Apr same date; go with Shanks.
785Rule StJohns 1920 1935 - May Sun>=1 23:00 1:00 D
786Rule StJohns 1920 1935 - Oct lastSun 23:00 0 S
787# For 1936-1941 Whitman gives May Sun>=8 and Oct Sun>=1; go with Shanks.
788Rule StJohns 1936 1941 - May Mon>=9 0:00 1:00 D
789Rule StJohns 1936 1941 - Oct Mon>=2 0:00 0 S
790# Whitman gives the following transitions:
791# 1942 03-01/12-31, 1943 05-30/09-05, 1944 07-10/09-02, 1945 01-01/10-07
792# but go with Shanks and assume they used Canadian rules.
793# For 1946-9 Whitman gives May 5,4,9,1 - Oct 1,5,3,2, and for 1950 he gives
794# Apr 30 - Sep 24; go with Shanks.
795Rule StJohns 1946 1950 - May Sun>=8 2:00 1:00 D
796Rule StJohns 1946 1950 - Oct Sun>=2 2:00 0 S
797Rule StJohns 1951 1986 - Apr lastSun 2:00 1:00 D
798Rule StJohns 1951 1959 - Sep lastSun 2:00 0 S
799Rule StJohns 1960 1986 - Oct lastSun 2:00 0 S
800# From Paul Eggert (2000-10-02):
801# INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
802# at 00:01 local time. For now, assume it started in 1987.
803Rule StJohns 1987 only - Apr Sun>=1 0:01 1:00 D
804Rule StJohns 1987 max - Oct lastSun 0:01 0 S
805Rule StJohns 1988 only - Apr Sun>=1 0:01 2:00 DD
806Rule StJohns 1989 max - Apr Sun>=1 0:01 1:00 D
807# St John's has an apostrophe, but Posix file names can't have apostrophes.
808# Zone NAME GMTOFF RULES FORMAT [UNTIL]
809Zone America/St_Johns -3:30:52 - LMT 1884
810 -3:30:52 StJohns N%sT 1918
811 -3:30:52 Canada N%sT 1919
812 -3:30:52 StJohns N%sT 1935 Mar 30
813 -3:30 StJohns N%sT 1942 May 11
814 -3:30 Canada N%sT 1946
815 -3:30 StJohns N%sT
816
817# most of east Labrador
818
819# The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
820# Zone NAME GMTOFF RULES FORMAT [UNTIL]
821Zone America/Goose_Bay -4:01:40 - LMT 1884 # Happy Valley-Goose Bay
822 -3:30:52 - NST 1918
823 -3:30:52 Canada N%sT 1919
824 -3:30:52 - NST 1935 Mar 30
825 -3:30 - NST 1936
826 -3:30 StJohns N%sT 1942 May 11
827 -3:30 Canada N%sT 1946
828 -3:30 StJohns N%sT 1966 Mar 15 2:00
829 -4:00 StJohns A%sT
830
831
832# west Labrador, New Brunswick, Nova Scotia, Prince Edward I
833
834# From Paul Eggert (1996-06-12):
835# Shanks writes that since 1970 most of this region has been like Halifax.
836# Many locales did not observe peacetime DST until 1972;
837# Glace Bay, NS is the largest that we know of.
838# Shanks also writes that Liverpool, NS was the only town in Canada to observe
839# DST in 1971 but not 1970; for now we'll assume this is a typo.
840
841# From Paul Eggert (2000-10-02):
842# INMS (2000-09-12) says that, since 1988 at least, New Brunswick switches
843# at 00:01 local time. FIXME: verify and create a new Zone for this.
844
845
846# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
847Rule Halifax 1916 only - Apr 1 0:00 1:00 D
848Rule Halifax 1916 only - Oct 1 0:00 0 S
849Rule Halifax 1920 only - May 9 0:00 1:00 D
850Rule Halifax 1920 only - Aug 29 0:00 0 S
851Rule Halifax 1921 only - May 6 0:00 1:00 D
852Rule Halifax 1921 1922 - Sep 5 0:00 0 S
853Rule Halifax 1922 only - Apr 30 0:00 1:00 D
854Rule Halifax 1923 1925 - May Sun>=1 0:00 1:00 D
855Rule Halifax 1923 only - Sep 4 0:00 0 S
856Rule Halifax 1924 only - Sep 15 0:00 0 S
857Rule Halifax 1925 only - Sep 28 0:00 0 S
858Rule Halifax 1926 only - May 16 0:00 1:00 D
859Rule Halifax 1926 only - Sep 13 0:00 0 S
860Rule Halifax 1927 only - May 1 0:00 1:00 D
861Rule Halifax 1927 only - Sep 26 0:00 0 S
862Rule Halifax 1928 1931 - May Sun>=8 0:00 1:00 D
863Rule Halifax 1928 only - Sep 9 0:00 0 S
864Rule Halifax 1929 only - Sep 3 0:00 0 S
865Rule Halifax 1930 only - Sep 15 0:00 0 S
866Rule Halifax 1931 1932 - Sep Mon>=24 0:00 0 S
867Rule Halifax 1932 only - May 1 0:00 1:00 D
868Rule Halifax 1933 only - Apr 30 0:00 1:00 D
869Rule Halifax 1933 only - Oct 2 0:00 0 S
870Rule Halifax 1934 only - May 20 0:00 1:00 D
871Rule Halifax 1934 only - Sep 16 0:00 0 S
872Rule Halifax 1935 only - Jun 2 0:00 1:00 D
873Rule Halifax 1935 only - Sep 30 0:00 0 S
874Rule Halifax 1936 only - Jun 1 0:00 1:00 D
875Rule Halifax 1936 only - Sep 14 0:00 0 S
876Rule Halifax 1937 1938 - May Sun>=1 0:00 1:00 D
877Rule Halifax 1937 1941 - Sep Mon>=24 0:00 0 S
878Rule Halifax 1939 only - May 28 0:00 1:00 D
879Rule Halifax 1940 1941 - May Sun>=1 0:00 1:00 D
880Rule Halifax 1946 1949 - Sep lastSun 2:00 0 S
881Rule Halifax 1946 1949 - Apr lastSun 2:00 1:00 D
882Rule Halifax 1951 1954 - Sep lastSun 2:00 0 S
883Rule Halifax 1951 1954 - Apr lastSun 2:00 1:00 D
884Rule Halifax 1956 1959 - Sep lastSun 2:00 0 S
885Rule Halifax 1956 1959 - Apr lastSun 2:00 1:00 D
886Rule Halifax 1962 1973 - Apr lastSun 2:00 1:00 D
887Rule Halifax 1962 1973 - Oct lastSun 2:00 0 S
888# Zone NAME GMTOFF RULES FORMAT [UNTIL]
889Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
890 -4:00 Halifax A%sT 1918
891 -4:00 Canada A%sT 1919
892 -4:00 Halifax A%sT 1942 Feb 9 2:00s
893 -4:00 Canada A%sT 1946
894 -4:00 Halifax A%sT 1974
895 -4:00 Canada A%sT
896Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
897 -4:00 Canada A%sT 1953
898 -4:00 Halifax A%sT 1954
899 -4:00 - AST 1972
900 -4:00 Halifax A%sT 1974
901 -4:00 Canada A%sT
902
903
904# Ontario, Quebec
905
906# From Paul Eggert (1996-06-12):
907# Shanks writes that since 1970 most of Ontario has been like Toronto,
908# and most of Quebec has been like Montreal.
909# Thunder Bay skipped DST in 1973.
910# Many smaller locales did not observe peacetime DST until 1974;
911# Nipigon (EST) and Rainy River (CST) are the largest that we know of.
912# Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
913
914# From Mark Brader (2003-07-26):
915# [According to the Toronto Star] Orillia, Ontario, adopted DST
916# effective Saturday, 1912-06-22, 22:00; the article mentions that
917# Port Arthur (now part of Thunder Bay, Ontario) as well as Moose Jaw
918# have already done so. In Orillia DST was to run until Saturday,
919# 1912-08-31 (no time mentioned), but it was met with considerable
920# hostility from certain segments of the public, and was revoked after
921# only two weeks -- I copied it as Saturday, 1912-07-07, 22:00, but
922# presumably that should be -07-06. (1912-06-19, -07-12; also letters
923# earlier in June).
924#
925# Kenora, Ontario, was to abandon DST on 1914-06-01 (-05-21).
926
927# From Paul Eggert (1997-10-17):
928# Mark Brader writes that an article in the 1997-10-14 Toronto Star
929# says that Atikokan, Ontario currently does not observe DST,
930# but will vote on 11-10 whether to use EST/EDT.
931# He also writes that the
932# <a href="http://www.gov.on.ca/MBS/english/publications/statregs/conttext.html">
933# Ontario Time Act (1990, Chapter T.9)
934# </a>
935# says that Ontario east of 90W uses EST/EDT, and west of 90W uses CST/CDT.
936# Officially Atikokan is therefore on CST/CDT, and most likely this report
937# concerns a non-official time observed as a matter of local practice.
938# For what it's worth, Shanks says that Atikokan has agreed with
939# Rainy River ever since standard time was introduced.
940
941# From Paul Eggert (2000-10-02):
942# Matthews and Vincent (1998) write that Atikokan, Pickle Lake, and
943# New Osnaburgh observe CST all year, that Big Trout Lake observes
944# CST/CDT, and that Upsala and Shebandowan observe EST/EDT, all in
945# violation of the official Ontario rules.
946# They also write that Quebec east of the -63 meridian is supposed to
947# observe AST, but residents as far east as Natashquan use EST/EDT,
948# and residents east of Natashquan use AST.
949# We probably need Zones for far east Quebec and for Atikokan,
950# but we don't know when their practices started.
951
952# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
953Rule Mont 1917 only - Mar 25 2:00 1:00 D
954Rule Mont 1917 only - Apr 24 0:00 0 S
955Rule Mont 1919 only - Mar 31 2:30 1:00 D
956Rule Mont 1919 only - Oct 25 2:30 0 S
957Rule Mont 1920 only - May 2 2:30 1:00 D
958Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S
959Rule Mont 1921 only - May 1 2:00 1:00 D
960Rule Mont 1922 only - Apr 30 2:00 1:00 D
961Rule Mont 1924 only - May 17 2:00 1:00 D
962Rule Mont 1924 1926 - Sep lastSun 2:30 0 S
963Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D
|
954Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
955Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
956Rule Mont 1938 1940 - Apr lastSun 0:00 1:00 D
957Rule Mont 1938 1939 - Sep lastSun 0:00 0 S
| 964# The 1927-to-1937 rules can be expressed more simply as
965# Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D
966# Rule Mont 1927 1937 - Sep lastSat 24:00 0 S
967# The rules below avoid use of 24:00
968# (which pre-1998 versions of zic cannot handle).
969Rule Mont 1927 only - May 1 0:00 1:00 D
970Rule Mont 1927 1932 - Sep lastSun 0:00 0 S
971Rule Mont 1928 1931 - Apr lastSun 0:00 1:00 D
972Rule Mont 1932 only - May 1 0:00 1:00 D
973Rule Mont 1933 1940 - Apr lastSun 0:00 1:00 D
974Rule Mont 1933 only - Oct 1 0:00 0 S
975Rule Mont 1934 1939 - Sep lastSun 0:00 0 S
|
958Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
959Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
960Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
961Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
962Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
963
964Rule Toronto 1919 only - Mar 30 23:30 1:00 D
965Rule Toronto 1919 only - Oct 26 0:00 0 S
966Rule Toronto 1920 only - May 2 2:00 1:00 D
967Rule Toronto 1920 only - Sep 26 0:00 0 S
968Rule Toronto 1921 only - May 15 2:00 1:00 D
969Rule Toronto 1921 only - Sep 15 2:00 0 S
970Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
971# Shanks says 1923-09-19; assume it's a typo and that "-16" was meant.
972Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
973Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
| 976Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D
977Rule Mont 1945 1948 - Sep lastSun 2:00 0 S
978Rule Mont 1949 1950 - Oct lastSun 2:00 0 S
979Rule Mont 1951 1956 - Sep lastSun 2:00 0 S
980Rule Mont 1957 1973 - Oct lastSun 2:00 0 S
981
982Rule Toronto 1919 only - Mar 30 23:30 1:00 D
983Rule Toronto 1919 only - Oct 26 0:00 0 S
984Rule Toronto 1920 only - May 2 2:00 1:00 D
985Rule Toronto 1920 only - Sep 26 0:00 0 S
986Rule Toronto 1921 only - May 15 2:00 1:00 D
987Rule Toronto 1921 only - Sep 15 2:00 0 S
988Rule Toronto 1922 1923 - May Sun>=8 2:00 1:00 D
989# Shanks says 1923-09-19; assume it's a typo and that "-16" was meant.
990Rule Toronto 1922 1926 - Sep Sun>=15 2:00 0 S
991Rule Toronto 1924 1927 - May Sun>=1 2:00 1:00 D
|
974Rule Toronto 1927 1928 - Sep lastSun 2:00 0 S
975Rule Toronto 1928 only - Apr lastSun 2:00 1:00 D
976Rule Toronto 1929 only - Apr lastSun 0:00 1:00 D
977Rule Toronto 1929 only - Sep lastSun 0:00 0 S
978Rule Toronto 1930 1937 - Apr lastSat 24:00 1:00 D
979Rule Toronto 1930 1937 - Sep lastSat 24:00 0 S
980Rule Toronto 1938 1940 - Apr lastSun 0:00 1:00 D
981Rule Toronto 1938 1939 - Sep lastSun 0:00 0 S
| 992# The 1927-to-1939 rules can be expressed more simply as
993# Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S
994# Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D
995# Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D
996# Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S
997# The rules below avoid use of Sun>=25
998# (which pre-2004 versions of zic cannot handle).
999Rule Toronto 1927 1932 - Sep lastSun 2:00 0 S
1000Rule Toronto 1928 1931 - Apr lastSun 2:00 1:00 D
1001Rule Toronto 1932 only - May 1 2:00 1:00 D
1002Rule Toronto 1933 1940 - Apr lastSun 2:00 1:00 D
1003Rule Toronto 1933 only - Oct 1 2:00 0 S
1004Rule Toronto 1934 1939 - Sep lastSun 2:00 0 S
|
982Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
983Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
984Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
985Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
986Rule Toronto 1949 only - Nov lastSun 0:00 0 S
987Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
988Rule Toronto 1950 only - Nov lastSun 2:00 0 S
989Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
990# Shanks says Toronto ended DST a week early in 1971, namely on 1971-10-24,
991# but Mark Brader wrote (2003-05-31) that he checked the 1971-10-30 issue
992# of the Toronto Star, and it said that DST ended 1971-10-31 as usual.
993Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
994
995# From Paul Eggert (2003-07-27):
996# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
997# Port Arthur, Ontario, the principle of the Bill has been in
998# operation for the past three years, and in the City of Moose Jaw,
| 1005Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S
1006Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D
1007Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D
1008Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S
1009Rule Toronto 1949 only - Nov lastSun 0:00 0 S
1010Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D
1011Rule Toronto 1950 only - Nov lastSun 2:00 0 S
1012Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S
1013# Shanks says Toronto ended DST a week early in 1971, namely on 1971-10-24,
1014# but Mark Brader wrote (2003-05-31) that he checked the 1971-10-30 issue
1015# of the Toronto Star, and it said that DST ended 1971-10-31 as usual.
1016Rule Toronto 1957 1973 - Oct lastSun 2:00 0 S
1017
1018# From Paul Eggert (2003-07-27):
1019# Willett (1914-03) writes (p. 17) "In the Cities of Fort William, and
1020# Port Arthur, Ontario, the principle of the Bill has been in
1021# operation for the past three years, and in the City of Moose Jaw,
|
999# Saskatchewan, for one year." Assume that the Thunder Bay region
1000# observed DST starting 1910, and Moose Jaw starting 1912, as this
1001# matches the Toronto Star report about Moose Jaw. For lack of better
1002# info, assume the Thunder Bay region used Willett's proposal, namely
1003# third Sunday in April at 02:00 to third Sunday in September at
1004# 03:00; also assume that they continued until Canada instituted
1005# uniform DST in 1918.
1006Rule Thunder 1910 1917 - Apr Sun>=15 2:00s 1:00 D
1007Rule Thunder 1910 1917 - Sep Sun>=15 2:00s 0 S
| 1022# Saskatchewan, for one year."
|
1008
| 1023
|
| 1024# From David Bryan via Tory Tronrud, Director/Curator,
1025# Thunder Bay Museum (2003-11-12):
1026# There is some suggestion, however, that, by-law or not, daylight
1027# savings time was being practiced in Fort William and Port Arthur
1028# before 1909.... [I]n 1910, the line between the Eastern and Central
1029# Time Zones was permanently moved about two hundred miles west to
1030# include the Thunder Bay area.... When Canada adopted daylight
1031# savings time in 1916, Fort William and Port Arthur, having done so
1032# already, did not change their clocks.... During the Second World
1033# War,... [t]he cities agreed to implement DST during the summer
1034# months for the remainder of the war years.
1035
|
1009# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1010Zone America/Montreal -4:54:16 - LMT 1884
1011 -5:00 Mont E%sT 1918
1012 -5:00 Canada E%sT 1919
1013 -5:00 Mont E%sT 1942 Feb 9 2:00s
1014 -5:00 Canada E%sT 1946
1015 -5:00 Mont E%sT 1974
1016 -5:00 Canada E%sT
1017Zone America/Toronto -5:17:32 - LMT 1895
1018 -5:00 Canada E%sT 1919
1019 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1020 -5:00 Canada E%sT 1946
1021 -5:00 Toronto E%sT 1974
1022 -5:00 Canada E%sT
1023Zone America/Thunder_Bay -5:57:00 - LMT 1895
| 1036# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1037Zone America/Montreal -4:54:16 - LMT 1884
1038 -5:00 Mont E%sT 1918
1039 -5:00 Canada E%sT 1919
1040 -5:00 Mont E%sT 1942 Feb 9 2:00s
1041 -5:00 Canada E%sT 1946
1042 -5:00 Mont E%sT 1974
1043 -5:00 Canada E%sT
1044Zone America/Toronto -5:17:32 - LMT 1895
1045 -5:00 Canada E%sT 1919
1046 -5:00 Toronto E%sT 1942 Feb 9 2:00s
1047 -5:00 Canada E%sT 1946
1048 -5:00 Toronto E%sT 1974
1049 -5:00 Canada E%sT
1050Zone America/Thunder_Bay -5:57:00 - LMT 1895
|
1024 -5:00 Thunder E%sT 1918
1025 -5:00 Canada E%sT 1940 Sep 29
1026 -5:00 1:00 EDT 1942 Feb 9 2:00s
| 1051 -6:00 - CST 1910
1052 -5:00 - EST 1942
|
1027 -5:00 Canada E%sT 1970
1028 -5:00 Mont E%sT 1973
1029 -5:00 - EST 1974
1030 -5:00 Canada E%sT
1031Zone America/Nipigon -5:53:04 - LMT 1895
1032 -5:00 Canada E%sT 1940 Sep 29
1033 -5:00 1:00 EDT 1942 Feb 9 2:00s
1034 -5:00 Canada E%sT
1035Zone America/Rainy_River -6:17:56 - LMT 1895
1036 -6:00 Canada C%sT 1940 Sep 29
1037 -6:00 1:00 CDT 1942 Feb 9 2:00s
1038 -6:00 Canada C%sT
1039
1040
1041# Manitoba
1042
1043# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1044Rule Winn 1916 only - Apr 23 0:00 1:00 D
1045Rule Winn 1916 only - Sep 17 0:00 0 S
1046Rule Winn 1918 only - Apr 14 2:00 1:00 D
1047Rule Winn 1918 only - Oct 31 2:00 0 S
1048Rule Winn 1937 only - May 16 2:00 1:00 D
1049Rule Winn 1937 only - Sep 26 2:00 0 S
1050Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1051Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1052Rule Winn 1945 only - Sep lastSun 2:00 0 S
1053Rule Winn 1946 only - May 12 2:00 1:00 D
1054Rule Winn 1946 only - Oct 13 2:00 0 S
1055Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1056Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1057Rule Winn 1950 only - May 1 2:00 1:00 D
1058Rule Winn 1950 only - Sep 30 2:00 0 S
1059Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1060Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1061Rule Winn 1959 only - Oct lastSun 2:00 0 S
1062Rule Winn 1960 only - Sep lastSun 2:00 0 S
1063Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1064Rule Winn 1963 only - Sep 22 2:00 0 S
1065Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
1066Rule Winn 1966 1986 - Oct lastSun 2:00 0 S
1067Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
1068# From Paul Eggert (2000-10-02):
1069# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from
1070# DST at 03:00 local time. For now, assume it started in 1987.
1071Rule Winn 1987 max - Oct lastSun 2:00s 0 S
1072# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1073Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1074 -6:00 Winn C%sT
1075
1076
1077# Saskatchewan
1078
1079# From Mark Brader (2003-07-26):
1080# The first actual adoption of DST in Canada was at the municipal
1081# level. As the [Toronto] Star put it (1912-06-07), "While people
1082# elsewhere have long been talking of legislation to save daylight,
1083# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1084# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1085# presumably late evening, as below), and would run until "the end of
1086# the summer". The discrepancy between municipal time and railroad
1087# time was noted.
1088
1089# From Paul Eggert (2003-07-27):
1090# Willett (1914-03) notes that DST "has been in operation ... in the
1091# City of Moose Jaw, Saskatchewan, for one year."
1092
1093# From Paul Eggert (2000-10-02):
1094# Shanks writes that since 1970 most of this region has been like Regina.
1095# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1096# Other western towns (e.g. Lloydminster) are like Edmonton.
1097# Matthews and Vincent (1998) write that Denare Beach and Creighton
1098# are like Winnipeg, in violation of Saskatchewan law.
1099
1100# From W. Jones <jones@skdad.usask.ca> (1992-11-06):
1101# The. . .below is based on information I got from our law library, the
1102# provincial archives, and the provincial Community Services department.
1103# A precise history would require digging through newspaper archives, and
1104# since you didn't say what you wanted, I didn't bother.
1105#
1106# Saskatchewan is split by a time zone meridian (105W) and over the years
1107# the boundary became pretty ragged as communities near it reevaluated
1108# their affiliations in one direction or the other. In 1965 a provincial
1109# referendum favoured legislating common time practices.
1110#
1111# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1112# Saskatchewan 1978) was proclaimed, and established that the eastern
1113# part of Saskatchewan would use CST year round, that districts in
1114# northwest Saskatchewan would by default follow CST but could opt to
1115# follow Mountain Time rules (thus 1 hour difference in the winter and
1116# zero in the summer), and that districts in southwest Saskatchewan would
1117# by default follow MT but could opt to follow CST.
1118#
1119# It took a few years for the dust to settle (I know one story of a town
1120# on one time zone having its school in another, such that a mom had to
1121# serve her family lunch in two shifts), but presently it seems that only
1122# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1123# rules any more; all other districts appear to have used CST year round
1124# since sometime in the 1960s.
1125
1126# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1127Rule Regina 1918 only - Apr 14 2:00 1:00 D
1128Rule Regina 1918 only - Oct 31 2:00 0 S
1129Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1130Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1131Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1132Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1133Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1134Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1135Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1136Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1137Rule Regina 1945 only - Sep lastSun 2:00 0 S
1138Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1139Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1140Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1141Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1142Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1143Rule Regina 1959 only - Oct lastSun 2:00 0 S
1144#
1145Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1146Rule Swift 1957 only - Oct lastSun 2:00 0 S
1147Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1148Rule Swift 1959 only - Oct lastSun 2:00 0 S
1149Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1150# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1151Zone America/Regina -6:58:36 - LMT 1905 Sep
1152 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1153 -6:00 - CST
1154Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1155 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1156 -7:00 Regina M%sT 1950
1157 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1158 -6:00 - CST
1159
1160
1161# Alberta
1162
1163# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1164Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1165Rule Edm 1918 only - Oct 31 2:00 0 S
1166Rule Edm 1919 only - May 27 2:00 0 S
1167Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1168Rule Edm 1920 only - Oct lastSun 2:00 0 S
1169Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1170Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1171Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1172Rule Edm 1945 only - Sep lastSun 2:00 0 S
1173Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1174Rule Edm 1947 only - Sep lastSun 2:00 0 S
1175Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1176Rule Edm 1967 only - Oct lastSun 2:00 0 S
1177Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1178Rule Edm 1969 only - Oct lastSun 2:00 0 S
1179Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1180Rule Edm 1972 max - Oct lastSun 2:00 0 S
1181Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
1182# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1183Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1184 -7:00 Edm M%sT
1185
1186
1187# British Columbia
1188
1189# From Paul Eggert (2000-10-02):
1190# Shanks writes that since 1970 most of this region has been like Vancouver.
1191# Dawson Creek uses MST. Much of east BC is like Edmonton.
1192# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1193
1194# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1195Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1196Rule Vanc 1918 only - Oct 31 2:00 0 S
1197Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1198Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1199Rule Vanc 1945 only - Sep 30 2:00 0 S
1200Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1201Rule Vanc 1946 only - Oct 13 2:00 0 S
1202Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1203Rule Vanc 1962 max - Oct lastSun 2:00 0 S
1204Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
1205# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1206Zone America/Vancouver -8:12:28 - LMT 1884
1207 -8:00 Vanc P%sT
1208Zone America/Dawson_Creek -8:00:56 - LMT 1884
1209 -8:00 Canada P%sT 1947
1210 -8:00 Vanc P%sT 1972 Aug 30 2:00
1211 -7:00 - MST
1212
1213
1214# Northwest Territories, Nunavut, Yukon
1215
1216# From Paul Eggert (1999-10-29):
1217# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1218# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs:
1219# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1220# c. 7 defines Yukon standard time as UTC-9. This is still valid;
1221# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1222# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1223# * O.I.C. 1980/02 established DST.
1224# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1225# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
1226
1227# From Rives McDow (1999-09-04):
1228# Nunavut ... moved ... to incorporate the whole territory into one time zone.
1229# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1230# Nunavut moves to single time zone Oct. 31
1231# </a>
1232#
1233# From Antoine Leca (1999-09-06):
1234# We then need to create a new timezone for the Kitikmeot region of Nunavut
1235# to differentiate it from the Yellowknife region.
1236
1237# From Paul Eggert (1999-09-20):
1238# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1239# Basic Facts: The New Territory
1240# </a> (1999) reports that Pangnirtung operates on eastern time,
1241# and that Coral Harbour does not observe DST. We don't know when
1242# Pangnirtung switched to eastern time; we'll guess 1995.
1243# We'll ignore the claim about Coral Harbour for now,
1244# since we have no further info.
1245
1246# From Rives McDow (1999-11-08):
1247# On October 31, when the rest of Nunavut went to Central time,
1248# Pangnirtung wobbled. Here is the result of their wobble:
1249#
1250# The following businesses and organizations in Pangnirtung use Central Time:
1251#
1252# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1253# Eastern Arctic National Parks, A & D Specialist
1254#
1255# The following businesses and organizations in Pangnirtung use Eastern Time:
1256#
1257# Hamlet office, All other businesses, Both schools, Airport operator
1258#
1259# This has made for an interesting situation there, which warranted the news.
1260# No one there that I spoke with seems concerned, or has plans to
1261# change the local methods of keeping time, as it evidently does not
1262# really interfere with any activities or make things difficult locally.
1263# They plan to celebrate New Year's turn-over twice, one hour apart,
1264# so it appears that the situation will last at least that long.
1265# The Nunavut Intergovernmental Affairs hopes that they will "come to
1266# their senses", but the locals evidently don't see any problem with
1267# the current state of affairs.
1268
1269# From Michaela Rodrigue, writing in the
1270# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1271# Nunatsiaq News (1999-11-19)</a>:
1272# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1273# central - or Nunavut time - for government offices, and eastern time
1274# for municipal offices and schools.... Igloolik [was similar but then]
1275# made the switch to central time on Saturday, Nov. 6.
1276
1277# From Paul Eggert (2000-10-02):
1278# Matthews and Vincent (1998) say the following, but we lack histories
1279# for these potential new Zones.
1280#
1281# The Canadian Forces station at Alert uses Eastern Time while the
1282# handful of residents at the Eureka weather station [in the Central
1283# zone] skip daylight savings. Baffin Island, which is crossed by the
1284# Central, Eastern and Atlantic Time zones only uses Eastern Time.
1285# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1286# Central Time and Southampton Island [in the Central zone] is not
1287# required to use daylight savings.
1288
1289# From
1290# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1291# Nunavut now has two time zones
1292# </a> (2000-11-10):
1293# The Nunavut government would allow its employees in Kugluktuk and
1294# Cambridge Bay to operate on central time year-round, putting them
1295# one hour behind the rest of Nunavut for six months during the winter.
1296# At the end of October the two communities had rebelled against
1297# Nunavut's unified time zone, refusing to shift to eastern time with
1298# the rest of the territory for the winter. Cambridge Bay remained on
1299# central time, while Kugluktuk, even farther west, reverted to
1300# mountain time, which they had used before the advent of Nunavut's
1301# unified time zone in 1999.
1302#
1303# From Rives McDow (2001-01-20), quoting the Nunavut government:
1304# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1305
1306# From Paul Eggert (2000-12-04):
1307# Let's just keep track of the official times for now.
1308
1309# From Rives McDow (2001-03-07):
1310# The premier of Nunavut has issued a ministerial statement advising
1311# that effective 2001-04-01, the territory of Nunavut will revert
1312# back to three time zones (mountain, central, and eastern). Of the
1313# cities in Nunavut, Coral Harbor is the only one that I know of that
1314# has said it will not observe dst, staying on EST year round. I'm
1315# checking for more info, and will get back to you if I come up with
1316# more.
1317# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
1318
1319# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1320Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
1321Rule NT_YK 1918 only - Oct 27 2:00 0 S
1322Rule NT_YK 1919 only - May 25 2:00 1:00 D
1323Rule NT_YK 1919 only - Nov 1 0:00 0 S
1324Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
1325Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
1326Rule NT_YK 1945 only - Sep 30 2:00 0 S
1327Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
1328Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
1329Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
1330Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
1331Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
1332# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1333Zone America/Pangnirtung -4:22:56 - LMT 1884
1334 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
1335 -5:00 Canada E%sT 1999 Oct 31 2:00
1336 -6:00 Canada C%sT 2000 Oct 29 2:00
1337 -5:00 Canada E%sT
1338Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987
1339 -5:00 NT_YK E%sT 1999 Oct 31 2:00
1340 -6:00 Canada C%sT 2000 Oct 29 2:00
1341 -5:00 Canada E%sT
1342Zone America/Rankin_Inlet -6:08:40 - LMT 1884
1343 -6:00 NT_YK C%sT 2000 Oct 29 2:00
1344 -5:00 - EST 2001 Apr 1 3:00
1345 -6:00 Canada C%sT
1346Zone America/Cambridge_Bay -7:00:20 - LMT 1884
1347 -7:00 NT_YK M%sT 1999 Oct 31 2:00
1348 -6:00 Canada C%sT 2000 Oct 29 2:00
1349 -5:00 - EST 2000 Nov 5 0:00
1350 -6:00 - CST 2001 Apr 1 3:00
1351 -7:00 Canada M%sT
1352Zone America/Yellowknife -7:37:24 - LMT 1884
1353 -7:00 NT_YK M%sT
1354Zone America/Inuvik -8:54:00 - LMT 1884
1355 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
1356 -7:00 NT_YK M%sT
1357Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
1358 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
1359 -8:00 NT_YK P%sT
1360Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
1361 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
1362 -8:00 NT_YK P%sT
1363
1364
1365###############################################################################
1366
1367# Mexico
1368
1369# From Paul Eggert (2001-03-05):
1370# The Investigation and Analysis Service of the
1371# Mexican Library of Congress (MLoC) has published a
1372# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
1373# history of Mexican local time (in Spanish)
1374# </a>.
1375#
1376# Here are the discrepancies between Shanks and the MLoC.
1377# (In all cases we go with the MLoC.)
1378# Shanks reports that Baja was at -8:00 in 1922/1923.
1379# Shanks says the 1930 transition in Baja was 1930-11-16.
1380# Shanks reports no DST during summer 1931.
1381# Shanks reports a transition at 1032-03-30 23:00, not 1932-04-01.
1382# Shanks does not report transitions for Baja in 1945 or 1948.
1383# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23.
1384# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00
1385# on 1997-10-26 at 02:00.
1386
1387# From Gwillim Law (2001-02-20):
1388# There are some other discrepancies between the Decrees page and the
1389# tz database. I think they can best be explained by supposing that
1390# the researchers who prepared the Decrees page failed to find some of
1391# the relevant documents.
1392
1393# From Paul Eggert (2000-07-26):
1394# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981
1395# and 1988 DST experiments. Go with spin.com.mx.
1396
1397# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
1398# A guy from our Mexico subsidiary finally found the Presidential Decree
1399# outlining the timezone changes in Mexico.
1400#
1401# ------------- Begin Forwarded Message -------------
1402#
1403# I finally got my hands on the Official Presidential Decree that sets up the
1404# rules for the DST changes. The rules are:
1405#
1406# 1. The country is divided in 3 timezones:
1407# - Baja California Norte (the Mexico/BajaNorte TZ)
1408# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
1409# - The rest of the country (the Mexico/General TZ)
1410#
1411# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
1412# at 2:00 AM, the times in each zone are as follows:
1413# BajaNorte: GMT+7
1414# BajaSur: GMT+6
1415# General: GMT+5
1416#
1417# 3. The rest of the year, the times are as follows:
1418# BajaNorte: GMT+8
1419# BajaSur: GMT+7
1420# General: GMT+6
1421#
1422# The Decree was published in Mexico's Official Newspaper on January 4th.
1423#
1424# -------------- End Forwarded Message --------------
1425# From Paul Eggert (1996-06-12):
1426# For an English translation of the decree, see
1427# <a href="http://mexico-travel.com/extra/timezone_eng.html">
1428# ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
1429# </a>
1430
1431# From Rives McDow (1998-10-08):
1432# The State of Quintana Roo has reverted back to central STD and DST times
1433# (i.e. UTC -0600 and -0500 as of 1998-08-02).
1434
1435# From Rives McDow (2000-01-10):
1436# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1437# zone 5 hours from the International Date Line, and will not observe daylight
1438# savings time so as to stay on the same time zone as the southern part of
1439# Arizona year round.
1440
1441# From Jesper Norgaard, translating
1442# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
1443# In Oaxaca, the 55.000 teachers from the Section 22 of the National
1444# Syndicate of Education Workers, refuse to apply daylight saving each
1445# year, so that the more than 10,000 schools work at normal hour the
1446# whole year.
1447
1448# From Gwillim Law (2001-01-19):
1449# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
1450# (translated):...
1451# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
1452# that Summer Time will be reduced from seven to five months, starting
1453# this year....
1454# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
1455# [translated], says "summer time will ... take effect on the first Sunday
1456# in May, and end on the last Sunday of September.
1457
1458# From Arthur David Olson (2001-01-25):
1459# The 2001-01-24 traditional Washington Post contained the page one
1460# story "Timely Issue Divides Mexicans."...
1461# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
1462# ... Mexico City Mayor Lopez Obrador "...is threatening to keep
1463# Mexico City and its 20 million residents on a different time than
1464# the rest of the country..." In particular, Lopez Obrador would abolish
1465# observation of Daylight Saving Time.
1466
1467# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
1468# Official statute published by the Energy Department
1469# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
1470# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
1471
1472# From Paul Eggert (2001-03-03):
1473#
1474# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
1475# James F. Smith writes in today's LA Times
1476# </a>
1477# * Sonora will continue to observe standard time.
1478# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
1479# the Federal District will not adopt DST.
1480# * 4 of 16 district leaders announced they'll ignore the decree.
1481# * The decree does not affect federal-controlled facilities including
1482# the airport, banks, hospitals, and schools.
1483#
1484# For now we'll assume that the Federal District will bow to federal rules.
1485
1486# From Jesper Norgaard (2001-04-01):
1487# I found some references to the Mexican application of daylight
1488# saving, which modifies what I had already sent you, stating earlier
1489# that a number of northern Mexican states would go on daylight
1490# saving. The modification reverts this to only cover Baja California
1491# (Norte), while all other states (except Sonora, who has no daylight
1492# saving all year) will follow the original decree of president
1493# Vicente Fox, starting daylight saving May 6, 2001 and ending
1494# September 30, 2001.
1495# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
1496# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
1497
1498# From Reuters (2001-09-04):
1499# Mexico's Supreme Court on Tuesday declared that daylight savings was
1500# unconstitutional in Mexico City, creating the possibility the
1501# capital will be in a different time zone from the rest of the nation
1502# next year.... The Supreme Court's ruling takes effect at 2:00
1503# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
1504# standard time. "This is so residents of the Federal District are not
1505# subject to unexpected time changes," a statement from the court said.
1506
1507# From Jesper Norgaard Welen (2002-03-12):
1508# ... consulting my local grocery store(!) and my coworkers, they all insisted
1509# that a new decision had been made to reinstate US style DST in Mexico....
1510# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
1511# confirms this. Sonora as usual is the only state where DST is not applied.
1512
1513# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1514Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1515Rule Mexico 1939 only - Jun 25 0:00 0 S
1516Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1517Rule Mexico 1941 only - Apr 1 0:00 0 S
1518Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
1519Rule Mexico 1944 only - May 1 0:00 0 S
1520Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1521Rule Mexico 1950 only - Jul 30 0:00 0 S
1522Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
1523Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
1524Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
1525Rule Mexico 2001 only - Sep lastSun 2:00 0 S
1526Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
1527Rule Mexico 2002 max - Oct lastSun 2:00 0 S
1528# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1529# Quintana Roo
1530Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1531 -6:00 - CST 1981 Dec 23
1532 -5:00 Mexico E%sT 1998 Aug 2 2:00
1533 -6:00 Mexico C%sT
1534# Campeche, Yucatan
1535Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
1536 -6:00 - CST 1981 Dec 23
1537 -5:00 - EST 1982 Dec 2
1538 -6:00 Mexico C%sT
1539# Coahuila, Durango, Nuevo Leon, Tamaulipas
1540Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
1541 -6:00 - CST 1988
1542 -6:00 US C%sT 1989
1543 -6:00 Mexico C%sT
1544# Central Mexico
1545Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1546 -7:00 - MST 1927 Jun 10 23:00
1547 -6:00 - CST 1930 Nov 15
1548 -7:00 - MST 1931 May 1 23:00
1549 -6:00 - CST 1931 Oct
1550 -7:00 - MST 1932 Apr 1
1551 -6:00 Mexico C%sT 2001 Sep 30 02:00
1552 -6:00 - CST 2002 Feb 20
1553 -6:00 Mexico C%sT
1554# Chihuahua
1555Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
1556 -7:00 - MST 1927 Jun 10 23:00
1557 -6:00 - CST 1930 Nov 15
1558 -7:00 - MST 1931 May 1 23:00
1559 -6:00 - CST 1931 Oct
1560 -7:00 - MST 1932 Apr 1
1561 -6:00 - CST 1996
1562 -6:00 Mexico C%sT 1998
1563 -6:00 - CST 1998 Apr Sun>=1 3:00
1564 -7:00 Mexico M%sT
1565# Sonora
1566Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
1567 -7:00 - MST 1927 Jun 10 23:00
1568 -6:00 - CST 1930 Nov 15
1569 -7:00 - MST 1931 May 1 23:00
1570 -6:00 - CST 1931 Oct
1571 -7:00 - MST 1932 Apr 1
1572 -6:00 - CST 1942 Apr 24
1573 -7:00 - MST 1949 Jan 14
1574 -8:00 - PST 1970
1575 -7:00 Mexico M%sT 1999
1576 -7:00 - MST
1577# Baja California Sur, Nayarit, Sinaloa
1578Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1579 -7:00 - MST 1927 Jun 10 23:00
1580 -6:00 - CST 1930 Nov 15
1581 -7:00 - MST 1931 May 1 23:00
1582 -6:00 - CST 1931 Oct
1583 -7:00 - MST 1932 Apr 1
1584 -6:00 - CST 1942 Apr 24
1585 -7:00 - MST 1949 Jan 14
1586 -8:00 - PST 1970
1587 -7:00 Mexico M%sT
1588# Baja California
1589Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1590 -7:00 - MST 1924
1591 -8:00 - PST 1927 Jun 10 23:00
1592 -7:00 - MST 1930 Nov 15
1593 -8:00 - PST 1931 Apr 1
1594 -8:00 1:00 PDT 1931 Sep 30
1595 -8:00 - PST 1942 Apr 24
1596 -8:00 1:00 PWT 1945 Nov 12
1597 -8:00 - PST 1948 Apr 5
1598 -8:00 1:00 PDT 1949 Jan 14
1599 -8:00 - PST 1954
1600 -8:00 CA P%sT 1961
1601 -8:00 - PST 1976
1602 -8:00 US P%sT 1996
1603 -8:00 Mexico P%sT 2001
1604 -8:00 US P%sT 2002 Feb 20
1605 -8:00 Mexico P%sT
1606# From Paul Eggert (2001-03-05):
1607# Formerly there was an America/Ensenada zone, which differed from
1608# America/Tijuana only in that it did not observe DST from 1976
1609# through 1995. This was as per Shanks. However, Guy Harris reports
1610# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
1611# Tijuana observe DST," which contradicts Shanks but does imply that
1612# DST-observance was a town-by-town matter back then. This concerns
1613# data after 1970 so most likely there should be at least one Zone
1614# other than America/Tijuana for Baja, but it's not clear yet what its
1615# name or contents should be.
1616#
1617# Revillagigedo Is
1618# no information
1619
1620###############################################################################
1621
1622# Anguilla
1623# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1624Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
1625 -4:00 - AST
1626
1627# Antigua and Barbuda
1628# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1629Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
1630 -5:00 - EST 1951
1631 -4:00 - AST
1632
1633# Bahamas
1634# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1635Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
1636Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
1637Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
1638# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1639Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
1640 -5:00 Bahamas E%sT
1641
1642# Barbados
1643# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1644Rule Barb 1977 only - Jun 12 2:00 1:00 D
1645Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
1646Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
1647Rule Barb 1979 only - Sep 30 2:00 0 S
1648Rule Barb 1980 only - Sep 25 2:00 0 S
1649# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1650Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
1651 -3:58:28 - BMT 1932 # Bridgetown Mean Time
1652 -4:00 Barb A%sT
1653
1654# Belize
1655# Whitman entirely disagrees with Shanks; go with Shanks.
1656# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1657Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
1658Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
1659Rule Belize 1973 only - Dec 5 0:00 1:00 D
1660Rule Belize 1974 only - Feb 9 0:00 0 S
1661Rule Belize 1982 only - Dec 18 0:00 1:00 D
1662Rule Belize 1983 only - Feb 12 0:00 0 S
1663# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1664Zone America/Belize -5:52:48 - LMT 1912 Apr
1665 -6:00 Belize C%sT
1666
1667# Bermuda
1668# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1669Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
1670 -4:00 - AST 1974 Apr 28 2:00
1671 -4:00 Bahamas A%sT
1672
1673# Cayman Is
1674# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1675Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
1676 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1677 -5:00 - EST
1678
1679# Costa Rica
1680# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1681Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
1682Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
1683Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
1684# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
1685Rule CR 1991 only - Jul 1 0:00 0 S
1686Rule CR 1992 only - Mar 15 0:00 0 S
1687# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
1688# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1689Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
1690 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time
1691 -6:00 CR C%sT
1692# Coco
1693# no information; probably like America/Costa_Rica
1694
1695# Cuba
1696
1697# From Arthur David Olson (1999-03-29):
1698# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
1699# the Cuban National Team and the Baltimore Orioles was carried live on
1700# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
1701# During the game, play-by-play announcer Jim Hunter noted that
1702# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
1703# Time today." (The "two hour" remark referred to losing one hour of
1704# sleep on 1999-03-28--when the announcers were in Cuba as it switched
1705# to DST--and one more hour on 1999-04-04--when the announcers will have
1706# returned to Baltimore, which switches on that date.)
1707
1708# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1709Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1710Rule Cuba 1928 only - Oct 10 0:00 0 S
1711Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1712Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1713Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1714Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1715Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1716Rule Cuba 1965 only - Sep 30 0:00 0 S
1717Rule Cuba 1966 only - May 29 0:00 1:00 D
1718Rule Cuba 1966 only - Oct 2 0:00 0 S
1719Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1720Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1721Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1722Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1723Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1724Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1725Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1726Rule Cuba 1978 only - May 7 0:00 1:00 D
1727Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
1728Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1729Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1730Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
1731Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
1732Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
1733Rule Cuba 1996 only - Oct 6 0:00s 0 S
1734Rule Cuba 1997 only - Oct 12 0:00s 0 S
1735Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
1736Rule Cuba 1998 max - Oct lastSun 0:00s 0 S
1737Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D
1738
1739# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1740Zone America/Havana -5:29:28 - LMT 1890
1741 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
1742 -5:00 Cuba C%sT
1743
1744# Dominica
1745# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1746Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1747 -4:00 - AST
1748
1749# Dominican Republic
1750
1751# From Steffen Thorsen (2000-10-30):
1752# Enrique Morales reported to me that the Dominican Republic has changed the
1753# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
1754# http://www.listin.com.do/antes/261000/republica/princi.html
1755
1756# From Paul Eggert (2000-12-04):
1757# That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
1758
1759# From Rives McDow (2000-12-01):
1760# Dominican Republic changed its mind and presidential decree on Tuesday,
1761# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
1762# Dominican Republic will be reverting to 8 hours from the International Date
1763# Line, and will not be using DST in the foreseeable future. The reason they
1764# decided to use DST was to be in synch with Puerto Rico, who was also going
1765# to implement DST. When Puerto Rico didn't implement DST, the president
1766# decided to revert.
1767
1768
1769# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1770Rule DR 1966 only - Oct 30 0:00 1:00 D
1771Rule DR 1967 only - Feb 28 0:00 0 S
1772Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
1773Rule DR 1970 only - Feb 21 0:00 0 S
1774Rule DR 1971 only - Jan 20 0:00 0 S
1775Rule DR 1972 1974 - Jan 21 0:00 0 S
1776# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1777Zone America/Santo_Domingo -4:39:36 - LMT 1890
1778 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
1779 -5:00 DR E%sT 1974 Oct 27
1780 -4:00 - AST 2000 Oct 29 02:00
1781 -5:00 US E%sT 2000 Dec 3 01:00
1782 -4:00 - AST
1783
1784# El Salvador
1785# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1786Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
1787Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
1788# There are too many San Salvadors elsewhere, so use America/El_Salvador
1789# instead of America/San_Salvador.
1790# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1791Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
1792 -6:00 Salv C%sT
1793
1794# Grenada
1795# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1796Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
1797 -4:00 - AST
1798
1799# Guadeloupe
1800# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1801Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
1802 -4:00 - AST
1803
1804# Guatemala
1805# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1806Rule Guat 1973 only - Nov 25 0:00 1:00 D
1807Rule Guat 1974 only - Feb 24 0:00 0 S
1808Rule Guat 1983 only - May 21 0:00 1:00 D
1809Rule Guat 1983 only - Sep 22 0:00 0 S
1810Rule Guat 1991 only - Mar 23 0:00 1:00 D
1811Rule Guat 1991 only - Sep 7 0:00 0 S
1812# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1813Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
1814 -6:00 Guat C%sT
1815
1816# Haiti
1817# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1818Rule Haiti 1983 only - May 8 0:00 1:00 D
1819Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
1820Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
1821# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA.
1822Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
1823Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
1824# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1825Zone America/Port-au-Prince -4:49:20 - LMT 1890
1826 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
1827 -5:00 Haiti E%sT
1828
1829# Honduras
1830# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
1831# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1832Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
1833 -6:00 Salv C%sT
1834#
1835# Great Swan I ceded by US to Honduras in 1972
1836
1837# Jamaica
1838
1839# From Bob Devine (1988-01-28):
1840# Follows US rules.
1841
1842# From U. S. Naval Observatory (1989-01-19):
1843# JAMAICA 5 H BEHIND UTC
1844
1845# From Shanks:
1846# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1847Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
1848 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1849 -5:00 - EST 1974 Apr 28 2:00
1850 -5:00 US E%sT 1984
1851 -5:00 - EST
1852
1853# Martinique
1854# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1855Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
1856 -4:04:20 - FFMT 1911 May # Fort-de-France MT
1857 -4:00 - AST 1980 Apr 6
1858 -4:00 1:00 ADT 1980 Sep 28
1859 -4:00 - AST
1860
1861# Montserrat
1862# From Paul Eggert (1997-08-31):
1863# Recent volcanic eruptions have forced evacuation of Plymouth, the capital.
1864# Luckily, Olveston, the current de facto capital, has the same longitude.
1865# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1866Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston
1867 -4:00 - AST
1868
1869# Nicaragua
1870#
1871# From Steffen Thorsen (1998-12-29):
1872# Nicaragua seems to be back at -6:00 but I have not been able to find when
1873# they changed from -5:00.
1874#
1875# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1876Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
1877Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
1878Rule Nic 1992 only - Jan 1 4:00 1:00 D
1879Rule Nic 1992 only - Sep 24 0:00 0 S
1880# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1881Zone America/Managua -5:45:08 - LMT 1890
1882 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
1883 -6:00 - CST 1973 May
1884 -5:00 - EST 1975 Feb 16
1885 -6:00 Nic C%sT 1993 Jan 1 4:00
1886 -5:00 - EST 1998 Dec
1887 -6:00 - CST
1888
1889# Panama
1890# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1891Zone America/Panama -5:18:08 - LMT 1890
1892 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
1893 -5:00 - EST
1894
1895# Puerto Rico
1896# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
1897# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1898Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
1899 -4:00 - AST 1942 May 3
1900 -4:00 1:00 AWT 1945 Sep 30 2:00
1901 -4:00 - AST
1902
1903# St Kitts-Nevis
1904# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1905Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
1906 -4:00 - AST
1907
1908# St Lucia
1909# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1910Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
1911 -4:04:00 - CMT 1912 # Castries Mean Time
1912 -4:00 - AST
1913
1914# St Pierre and Miquelon
1915# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
1916# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1917Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
1918 -4:00 - AST 1980 May
1919 -3:00 - PMST 1987 # Pierre & Miquelon Time
1920 -3:00 Canada PM%sT
1921
1922# St Vincent and the Grenadines
1923# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1924Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
1925 -4:04:56 - KMT 1912 # Kingstown Mean Time
1926 -4:00 - AST
1927
1928# Turks and Caicos
1929# From Paul Eggert (1998-08-06):
1930# Shanks says they use US DST rules, but IATA SSIM (1991/1998)
1931# says they switch at midnight. Go with IATA SSIM.
1932# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1933Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
1934Rule TC 1979 max - Oct lastSun 0:00 0 S
1935Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
1936# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1937Zone America/Grand_Turk -4:44:32 - LMT 1890
1938 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1939 -5:00 TC E%sT
1940
1941# British Virgin Is
1942# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1943Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
1944 -4:00 - AST
1945
1946# Virgin Is
1947# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1948Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
1949 -4:00 - AST
| 1053 -5:00 Canada E%sT 1970
1054 -5:00 Mont E%sT 1973
1055 -5:00 - EST 1974
1056 -5:00 Canada E%sT
1057Zone America/Nipigon -5:53:04 - LMT 1895
1058 -5:00 Canada E%sT 1940 Sep 29
1059 -5:00 1:00 EDT 1942 Feb 9 2:00s
1060 -5:00 Canada E%sT
1061Zone America/Rainy_River -6:17:56 - LMT 1895
1062 -6:00 Canada C%sT 1940 Sep 29
1063 -6:00 1:00 CDT 1942 Feb 9 2:00s
1064 -6:00 Canada C%sT
1065
1066
1067# Manitoba
1068
1069# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1070Rule Winn 1916 only - Apr 23 0:00 1:00 D
1071Rule Winn 1916 only - Sep 17 0:00 0 S
1072Rule Winn 1918 only - Apr 14 2:00 1:00 D
1073Rule Winn 1918 only - Oct 31 2:00 0 S
1074Rule Winn 1937 only - May 16 2:00 1:00 D
1075Rule Winn 1937 only - Sep 26 2:00 0 S
1076Rule Winn 1942 only - Feb 9 2:00 1:00 W # War
1077Rule Winn 1945 only - Aug 14 23:00u 1:00 P # Peace
1078Rule Winn 1945 only - Sep lastSun 2:00 0 S
1079Rule Winn 1946 only - May 12 2:00 1:00 D
1080Rule Winn 1946 only - Oct 13 2:00 0 S
1081Rule Winn 1947 1949 - Apr lastSun 2:00 1:00 D
1082Rule Winn 1947 1949 - Sep lastSun 2:00 0 S
1083Rule Winn 1950 only - May 1 2:00 1:00 D
1084Rule Winn 1950 only - Sep 30 2:00 0 S
1085Rule Winn 1951 1960 - Apr lastSun 2:00 1:00 D
1086Rule Winn 1951 1958 - Sep lastSun 2:00 0 S
1087Rule Winn 1959 only - Oct lastSun 2:00 0 S
1088Rule Winn 1960 only - Sep lastSun 2:00 0 S
1089Rule Winn 1963 only - Apr lastSun 2:00 1:00 D
1090Rule Winn 1963 only - Sep 22 2:00 0 S
1091Rule Winn 1966 1986 - Apr lastSun 2:00 1:00 D
1092Rule Winn 1966 1986 - Oct lastSun 2:00 0 S
1093Rule Winn 1987 max - Apr Sun>=1 2:00 1:00 D
1094# From Paul Eggert (2000-10-02):
1095# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from
1096# DST at 03:00 local time. For now, assume it started in 1987.
1097Rule Winn 1987 max - Oct lastSun 2:00s 0 S
1098# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1099Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
1100 -6:00 Winn C%sT
1101
1102
1103# Saskatchewan
1104
1105# From Mark Brader (2003-07-26):
1106# The first actual adoption of DST in Canada was at the municipal
1107# level. As the [Toronto] Star put it (1912-06-07), "While people
1108# elsewhere have long been talking of legislation to save daylight,
1109# the city of Moose Jaw [Saskatchewan] has acted on its own hook."
1110# DST in Moose Jaw began on Saturday, 1912-06-01 (no time mentioned:
1111# presumably late evening, as below), and would run until "the end of
1112# the summer". The discrepancy between municipal time and railroad
1113# time was noted.
1114
1115# From Paul Eggert (2003-07-27):
1116# Willett (1914-03) notes that DST "has been in operation ... in the
1117# City of Moose Jaw, Saskatchewan, for one year."
1118
1119# From Paul Eggert (2000-10-02):
1120# Shanks writes that since 1970 most of this region has been like Regina.
1121# Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
1122# Other western towns (e.g. Lloydminster) are like Edmonton.
1123# Matthews and Vincent (1998) write that Denare Beach and Creighton
1124# are like Winnipeg, in violation of Saskatchewan law.
1125
1126# From W. Jones <jones@skdad.usask.ca> (1992-11-06):
1127# The. . .below is based on information I got from our law library, the
1128# provincial archives, and the provincial Community Services department.
1129# A precise history would require digging through newspaper archives, and
1130# since you didn't say what you wanted, I didn't bother.
1131#
1132# Saskatchewan is split by a time zone meridian (105W) and over the years
1133# the boundary became pretty ragged as communities near it reevaluated
1134# their affiliations in one direction or the other. In 1965 a provincial
1135# referendum favoured legislating common time practices.
1136#
1137# On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
1138# Saskatchewan 1978) was proclaimed, and established that the eastern
1139# part of Saskatchewan would use CST year round, that districts in
1140# northwest Saskatchewan would by default follow CST but could opt to
1141# follow Mountain Time rules (thus 1 hour difference in the winter and
1142# zero in the summer), and that districts in southwest Saskatchewan would
1143# by default follow MT but could opt to follow CST.
1144#
1145# It took a few years for the dust to settle (I know one story of a town
1146# on one time zone having its school in another, such that a mom had to
1147# serve her family lunch in two shifts), but presently it seems that only
1148# a few towns on the border with Alberta (e.g. Lloydminster) follow MT
1149# rules any more; all other districts appear to have used CST year round
1150# since sometime in the 1960s.
1151
1152# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1153Rule Regina 1918 only - Apr 14 2:00 1:00 D
1154Rule Regina 1918 only - Oct 31 2:00 0 S
1155Rule Regina 1930 1934 - May Sun>=1 0:00 1:00 D
1156Rule Regina 1930 1934 - Oct Sun>=1 0:00 0 S
1157Rule Regina 1937 1941 - Apr Sun>=8 0:00 1:00 D
1158Rule Regina 1937 only - Oct Sun>=8 0:00 0 S
1159Rule Regina 1938 only - Oct Sun>=1 0:00 0 S
1160Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
1161Rule Regina 1942 only - Feb 9 2:00 1:00 W # War
1162Rule Regina 1945 only - Aug 14 23:00u 1:00 P # Peace
1163Rule Regina 1945 only - Sep lastSun 2:00 0 S
1164Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
1165Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
1166Rule Regina 1947 1957 - Apr lastSun 2:00 1:00 D
1167Rule Regina 1947 1957 - Sep lastSun 2:00 0 S
1168Rule Regina 1959 only - Apr lastSun 2:00 1:00 D
1169Rule Regina 1959 only - Oct lastSun 2:00 0 S
1170#
1171Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
1172Rule Swift 1957 only - Oct lastSun 2:00 0 S
1173Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
1174Rule Swift 1959 only - Oct lastSun 2:00 0 S
1175Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
1176# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1177Zone America/Regina -6:58:36 - LMT 1905 Sep
1178 -7:00 Regina M%sT 1960 Apr lastSun 2:00
1179 -6:00 - CST
1180Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
1181 -7:00 Canada M%sT 1946 Apr lastSun 2:00
1182 -7:00 Regina M%sT 1950
1183 -7:00 Swift M%sT 1972 Apr lastSun 2:00
1184 -6:00 - CST
1185
1186
1187# Alberta
1188
1189# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1190Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
1191Rule Edm 1918 only - Oct 31 2:00 0 S
1192Rule Edm 1919 only - May 27 2:00 0 S
1193Rule Edm 1920 1923 - Apr lastSun 2:00 1:00 D
1194Rule Edm 1920 only - Oct lastSun 2:00 0 S
1195Rule Edm 1921 1923 - Sep lastSun 2:00 0 S
1196Rule Edm 1942 only - Feb 9 2:00 1:00 W # War
1197Rule Edm 1945 only - Aug 14 23:00u 1:00 P # Peace
1198Rule Edm 1945 only - Sep lastSun 2:00 0 S
1199Rule Edm 1947 only - Apr lastSun 2:00 1:00 D
1200Rule Edm 1947 only - Sep lastSun 2:00 0 S
1201Rule Edm 1967 only - Apr lastSun 2:00 1:00 D
1202Rule Edm 1967 only - Oct lastSun 2:00 0 S
1203Rule Edm 1969 only - Apr lastSun 2:00 1:00 D
1204Rule Edm 1969 only - Oct lastSun 2:00 0 S
1205Rule Edm 1972 1986 - Apr lastSun 2:00 1:00 D
1206Rule Edm 1972 max - Oct lastSun 2:00 0 S
1207Rule Edm 1987 max - Apr Sun>=1 2:00 1:00 D
1208# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1209Zone America/Edmonton -7:33:52 - LMT 1906 Sep
1210 -7:00 Edm M%sT
1211
1212
1213# British Columbia
1214
1215# From Paul Eggert (2000-10-02):
1216# Shanks writes that since 1970 most of this region has been like Vancouver.
1217# Dawson Creek uses MST. Much of east BC is like Edmonton.
1218# Matthews and Vincent (1998) write that Creston is like Dawson Creek.
1219
1220# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1221Rule Vanc 1918 only - Apr 14 2:00 1:00 D
1222Rule Vanc 1918 only - Oct 31 2:00 0 S
1223Rule Vanc 1942 only - Feb 9 2:00 1:00 W # War
1224Rule Vanc 1945 only - Aug 14 23:00u 1:00 P # Peace
1225Rule Vanc 1945 only - Sep 30 2:00 0 S
1226Rule Vanc 1946 1986 - Apr lastSun 2:00 1:00 D
1227Rule Vanc 1946 only - Oct 13 2:00 0 S
1228Rule Vanc 1947 1961 - Sep lastSun 2:00 0 S
1229Rule Vanc 1962 max - Oct lastSun 2:00 0 S
1230Rule Vanc 1987 max - Apr Sun>=1 2:00 1:00 D
1231# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1232Zone America/Vancouver -8:12:28 - LMT 1884
1233 -8:00 Vanc P%sT
1234Zone America/Dawson_Creek -8:00:56 - LMT 1884
1235 -8:00 Canada P%sT 1947
1236 -8:00 Vanc P%sT 1972 Aug 30 2:00
1237 -7:00 - MST
1238
1239
1240# Northwest Territories, Nunavut, Yukon
1241
1242# From Paul Eggert (1999-10-29):
1243# Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
1244# Mathew Englander <mathew@io.org> (1996-10-07) gives the following refs:
1245# * 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
1246# c. 7 defines Yukon standard time as UTC-9. This is still valid;
1247# see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
1248# * C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
1249# * O.I.C. 1980/02 established DST.
1250# * O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
1251# Shanks says Yukon's 1973-10-28 switch was at 2:00; go with Englander.
1252
1253# From Rives McDow (1999-09-04):
1254# Nunavut ... moved ... to incorporate the whole territory into one time zone.
1255# <a href="http://www.nunatsiaq.com/nunavut/nvt90903_13.html">
1256# Nunavut moves to single time zone Oct. 31
1257# </a>
1258#
1259# From Antoine Leca (1999-09-06):
1260# We then need to create a new timezone for the Kitikmeot region of Nunavut
1261# to differentiate it from the Yellowknife region.
1262
1263# From Paul Eggert (1999-09-20):
1264# <a href="http://www.nunavut.com/basicfacts/english/basicfacts_1territory.html">
1265# Basic Facts: The New Territory
1266# </a> (1999) reports that Pangnirtung operates on eastern time,
1267# and that Coral Harbour does not observe DST. We don't know when
1268# Pangnirtung switched to eastern time; we'll guess 1995.
1269# We'll ignore the claim about Coral Harbour for now,
1270# since we have no further info.
1271
1272# From Rives McDow (1999-11-08):
1273# On October 31, when the rest of Nunavut went to Central time,
1274# Pangnirtung wobbled. Here is the result of their wobble:
1275#
1276# The following businesses and organizations in Pangnirtung use Central Time:
1277#
1278# First Air, Power Corp, Nunavut Construction, Health Center, RCMP,
1279# Eastern Arctic National Parks, A & D Specialist
1280#
1281# The following businesses and organizations in Pangnirtung use Eastern Time:
1282#
1283# Hamlet office, All other businesses, Both schools, Airport operator
1284#
1285# This has made for an interesting situation there, which warranted the news.
1286# No one there that I spoke with seems concerned, or has plans to
1287# change the local methods of keeping time, as it evidently does not
1288# really interfere with any activities or make things difficult locally.
1289# They plan to celebrate New Year's turn-over twice, one hour apart,
1290# so it appears that the situation will last at least that long.
1291# The Nunavut Intergovernmental Affairs hopes that they will "come to
1292# their senses", but the locals evidently don't see any problem with
1293# the current state of affairs.
1294
1295# From Michaela Rodrigue, writing in the
1296# <a href="http://www.nunatsiaq.com/archives/nunavut991130/nvt91119_17.html">
1297# Nunatsiaq News (1999-11-19)</a>:
1298# Clyde River, Pangnirtung and Sanikiluaq now operate with two time zones,
1299# central - or Nunavut time - for government offices, and eastern time
1300# for municipal offices and schools.... Igloolik [was similar but then]
1301# made the switch to central time on Saturday, Nov. 6.
1302
1303# From Paul Eggert (2000-10-02):
1304# Matthews and Vincent (1998) say the following, but we lack histories
1305# for these potential new Zones.
1306#
1307# The Canadian Forces station at Alert uses Eastern Time while the
1308# handful of residents at the Eureka weather station [in the Central
1309# zone] skip daylight savings. Baffin Island, which is crossed by the
1310# Central, Eastern and Atlantic Time zones only uses Eastern Time.
1311# Gjoa Haven, Taloyoak and Pelly Bay all use Mountain instead of
1312# Central Time and Southampton Island [in the Central zone] is not
1313# required to use daylight savings.
1314
1315# From
1316# <a href="http://www.nunatsiaq.com/archives/nunavut001130/nvt21110_02.html">
1317# Nunavut now has two time zones
1318# </a> (2000-11-10):
1319# The Nunavut government would allow its employees in Kugluktuk and
1320# Cambridge Bay to operate on central time year-round, putting them
1321# one hour behind the rest of Nunavut for six months during the winter.
1322# At the end of October the two communities had rebelled against
1323# Nunavut's unified time zone, refusing to shift to eastern time with
1324# the rest of the territory for the winter. Cambridge Bay remained on
1325# central time, while Kugluktuk, even farther west, reverted to
1326# mountain time, which they had used before the advent of Nunavut's
1327# unified time zone in 1999.
1328#
1329# From Rives McDow (2001-01-20), quoting the Nunavut government:
1330# The preceding decision came into effect at midnight, Saturday Nov 4, 2000.
1331
1332# From Paul Eggert (2000-12-04):
1333# Let's just keep track of the official times for now.
1334
1335# From Rives McDow (2001-03-07):
1336# The premier of Nunavut has issued a ministerial statement advising
1337# that effective 2001-04-01, the territory of Nunavut will revert
1338# back to three time zones (mountain, central, and eastern). Of the
1339# cities in Nunavut, Coral Harbor is the only one that I know of that
1340# has said it will not observe dst, staying on EST year round. I'm
1341# checking for more info, and will get back to you if I come up with
1342# more.
1343# [Also see <http://www.nunatsiaq.com/nunavut/nvt10309_06.html> (2001-03-09).]
1344
1345# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1346Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
1347Rule NT_YK 1918 only - Oct 27 2:00 0 S
1348Rule NT_YK 1919 only - May 25 2:00 1:00 D
1349Rule NT_YK 1919 only - Nov 1 0:00 0 S
1350Rule NT_YK 1942 only - Feb 9 2:00 1:00 W # War
1351Rule NT_YK 1945 only - Aug 14 23:00u 1:00 P # Peace
1352Rule NT_YK 1945 only - Sep 30 2:00 0 S
1353Rule NT_YK 1965 only - Apr lastSun 0:00 2:00 DD
1354Rule NT_YK 1965 only - Oct lastSun 2:00 0 S
1355Rule NT_YK 1980 1986 - Apr lastSun 2:00 1:00 D
1356Rule NT_YK 1980 max - Oct lastSun 2:00 0 S
1357Rule NT_YK 1987 max - Apr Sun>=1 2:00 1:00 D
1358# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1359Zone America/Pangnirtung -4:22:56 - LMT 1884
1360 -4:00 NT_YK A%sT 1995 Apr Sun>=1 2:00
1361 -5:00 Canada E%sT 1999 Oct 31 2:00
1362 -6:00 Canada C%sT 2000 Oct 29 2:00
1363 -5:00 Canada E%sT
1364Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay before 1987
1365 -5:00 NT_YK E%sT 1999 Oct 31 2:00
1366 -6:00 Canada C%sT 2000 Oct 29 2:00
1367 -5:00 Canada E%sT
1368Zone America/Rankin_Inlet -6:08:40 - LMT 1884
1369 -6:00 NT_YK C%sT 2000 Oct 29 2:00
1370 -5:00 - EST 2001 Apr 1 3:00
1371 -6:00 Canada C%sT
1372Zone America/Cambridge_Bay -7:00:20 - LMT 1884
1373 -7:00 NT_YK M%sT 1999 Oct 31 2:00
1374 -6:00 Canada C%sT 2000 Oct 29 2:00
1375 -5:00 - EST 2000 Nov 5 0:00
1376 -6:00 - CST 2001 Apr 1 3:00
1377 -7:00 Canada M%sT
1378Zone America/Yellowknife -7:37:24 - LMT 1884
1379 -7:00 NT_YK M%sT
1380Zone America/Inuvik -8:54:00 - LMT 1884
1381 -8:00 NT_YK P%sT 1979 Apr lastSun 2:00
1382 -7:00 NT_YK M%sT
1383Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
1384 -9:00 NT_YK Y%sT 1966 Jul 1 2:00
1385 -8:00 NT_YK P%sT
1386Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
1387 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
1388 -8:00 NT_YK P%sT
1389
1390
1391###############################################################################
1392
1393# Mexico
1394
1395# From Paul Eggert (2001-03-05):
1396# The Investigation and Analysis Service of the
1397# Mexican Library of Congress (MLoC) has published a
1398# <a href="http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/">
1399# history of Mexican local time (in Spanish)
1400# </a>.
1401#
1402# Here are the discrepancies between Shanks and the MLoC.
1403# (In all cases we go with the MLoC.)
1404# Shanks reports that Baja was at -8:00 in 1922/1923.
1405# Shanks says the 1930 transition in Baja was 1930-11-16.
1406# Shanks reports no DST during summer 1931.
1407# Shanks reports a transition at 1032-03-30 23:00, not 1932-04-01.
1408# Shanks does not report transitions for Baja in 1945 or 1948.
1409# Shanks reports southern Mexico transitions on 1981-12-01, not 12-23.
1410# Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00
1411# on 1997-10-26 at 02:00.
1412
1413# From Gwillim Law (2001-02-20):
1414# There are some other discrepancies between the Decrees page and the
1415# tz database. I think they can best be explained by supposing that
1416# the researchers who prepared the Decrees page failed to find some of
1417# the relevant documents.
1418
1419# From Paul Eggert (2000-07-26):
1420# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981
1421# and 1988 DST experiments. Go with spin.com.mx.
1422
1423# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
1424# A guy from our Mexico subsidiary finally found the Presidential Decree
1425# outlining the timezone changes in Mexico.
1426#
1427# ------------- Begin Forwarded Message -------------
1428#
1429# I finally got my hands on the Official Presidential Decree that sets up the
1430# rules for the DST changes. The rules are:
1431#
1432# 1. The country is divided in 3 timezones:
1433# - Baja California Norte (the Mexico/BajaNorte TZ)
1434# - Baja California Sur, Nayarit, Sinaloa and Sonora (the Mexico/BajaSur TZ)
1435# - The rest of the country (the Mexico/General TZ)
1436#
1437# 2. From the first Sunday in April at 2:00 AM to the last Sunday in October
1438# at 2:00 AM, the times in each zone are as follows:
1439# BajaNorte: GMT+7
1440# BajaSur: GMT+6
1441# General: GMT+5
1442#
1443# 3. The rest of the year, the times are as follows:
1444# BajaNorte: GMT+8
1445# BajaSur: GMT+7
1446# General: GMT+6
1447#
1448# The Decree was published in Mexico's Official Newspaper on January 4th.
1449#
1450# -------------- End Forwarded Message --------------
1451# From Paul Eggert (1996-06-12):
1452# For an English translation of the decree, see
1453# <a href="http://mexico-travel.com/extra/timezone_eng.html">
1454# ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
1455# </a>
1456
1457# From Rives McDow (1998-10-08):
1458# The State of Quintana Roo has reverted back to central STD and DST times
1459# (i.e. UTC -0600 and -0500 as of 1998-08-02).
1460
1461# From Rives McDow (2000-01-10):
1462# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1463# zone 5 hours from the International Date Line, and will not observe daylight
1464# savings time so as to stay on the same time zone as the southern part of
1465# Arizona year round.
1466
1467# From Jesper Norgaard, translating
1468# <http://www.reforma.com/nacional/articulo/064327/> (2001-01-17):
1469# In Oaxaca, the 55.000 teachers from the Section 22 of the National
1470# Syndicate of Education Workers, refuse to apply daylight saving each
1471# year, so that the more than 10,000 schools work at normal hour the
1472# whole year.
1473
1474# From Gwillim Law (2001-01-19):
1475# <http://www.reforma.com/negocios_y_dinero/articulo/064481/> ... says
1476# (translated):...
1477# January 17, 2000 - The Energy Secretary, Ernesto Martens, announced
1478# that Summer Time will be reduced from seven to five months, starting
1479# this year....
1480# <http://www.publico.com.mx/scripts/texto3.asp?action=pagina&pag=21&pos=p&secc=naci&date=01/17/2001>
1481# [translated], says "summer time will ... take effect on the first Sunday
1482# in May, and end on the last Sunday of September.
1483
1484# From Arthur David Olson (2001-01-25):
1485# The 2001-01-24 traditional Washington Post contained the page one
1486# story "Timely Issue Divides Mexicans."...
1487# http://www.washingtonpost.com/wp-dyn/articles/A37383-2001Jan23.html
1488# ... Mexico City Mayor Lopez Obrador "...is threatening to keep
1489# Mexico City and its 20 million residents on a different time than
1490# the rest of the country..." In particular, Lopez Obrador would abolish
1491# observation of Daylight Saving Time.
1492
1493# <a href="http://www.conae.gob.mx/ahorro/decretohorver2001.html#decre">
1494# Official statute published by the Energy Department
1495# </a> (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
1496# and Sonora with no DST. This was reported by Jesper Norgaard (2001-02-03).
1497
1498# From Paul Eggert (2001-03-03):
1499#
1500# <a href="http://www.latimes.com/news/nation/20010303/t000018766.html">
1501# James F. Smith writes in today's LA Times
1502# </a>
1503# * Sonora will continue to observe standard time.
1504# * Last week Mexico City's mayor Andres Manuel Lopez Obrador decreed that
1505# the Federal District will not adopt DST.
1506# * 4 of 16 district leaders announced they'll ignore the decree.
1507# * The decree does not affect federal-controlled facilities including
1508# the airport, banks, hospitals, and schools.
1509#
1510# For now we'll assume that the Federal District will bow to federal rules.
1511
1512# From Jesper Norgaard (2001-04-01):
1513# I found some references to the Mexican application of daylight
1514# saving, which modifies what I had already sent you, stating earlier
1515# that a number of northern Mexican states would go on daylight
1516# saving. The modification reverts this to only cover Baja California
1517# (Norte), while all other states (except Sonora, who has no daylight
1518# saving all year) will follow the original decree of president
1519# Vicente Fox, starting daylight saving May 6, 2001 and ending
1520# September 30, 2001.
1521# References: "Diario de Monterrey" <www.diariodemonterrey.com/index.asp>
1522# Palabra <http://palabra.infosel.com/010331/primera/ppri3101.pdf> (2001-03-31)
1523
1524# From Reuters (2001-09-04):
1525# Mexico's Supreme Court on Tuesday declared that daylight savings was
1526# unconstitutional in Mexico City, creating the possibility the
1527# capital will be in a different time zone from the rest of the nation
1528# next year.... The Supreme Court's ruling takes effect at 2:00
1529# a.m. (0800 GMT) on Sept. 30, when Mexico is scheduled to revert to
1530# standard time. "This is so residents of the Federal District are not
1531# subject to unexpected time changes," a statement from the court said.
1532
1533# From Jesper Norgaard Welen (2002-03-12):
1534# ... consulting my local grocery store(!) and my coworkers, they all insisted
1535# that a new decision had been made to reinstate US style DST in Mexico....
1536# http://www.conae.gob.mx/ahorro/horaver2001_m1_2002.html (2002-02-20)
1537# confirms this. Sonora as usual is the only state where DST is not applied.
1538
1539# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1540Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1541Rule Mexico 1939 only - Jun 25 0:00 0 S
1542Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1543Rule Mexico 1941 only - Apr 1 0:00 0 S
1544Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War
1545Rule Mexico 1944 only - May 1 0:00 0 S
1546Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1547Rule Mexico 1950 only - Jul 30 0:00 0 S
1548Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D
1549Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S
1550Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D
1551Rule Mexico 2001 only - Sep lastSun 2:00 0 S
1552Rule Mexico 2002 max - Apr Sun>=1 2:00 1:00 D
1553Rule Mexico 2002 max - Oct lastSun 2:00 0 S
1554# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1555# Quintana Roo
1556Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1557 -6:00 - CST 1981 Dec 23
1558 -5:00 Mexico E%sT 1998 Aug 2 2:00
1559 -6:00 Mexico C%sT
1560# Campeche, Yucatan
1561Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
1562 -6:00 - CST 1981 Dec 23
1563 -5:00 - EST 1982 Dec 2
1564 -6:00 Mexico C%sT
1565# Coahuila, Durango, Nuevo Leon, Tamaulipas
1566Zone America/Monterrey -6:41:16 - LMT 1921 Dec 31 23:18:44
1567 -6:00 - CST 1988
1568 -6:00 US C%sT 1989
1569 -6:00 Mexico C%sT
1570# Central Mexico
1571Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1572 -7:00 - MST 1927 Jun 10 23:00
1573 -6:00 - CST 1930 Nov 15
1574 -7:00 - MST 1931 May 1 23:00
1575 -6:00 - CST 1931 Oct
1576 -7:00 - MST 1932 Apr 1
1577 -6:00 Mexico C%sT 2001 Sep 30 02:00
1578 -6:00 - CST 2002 Feb 20
1579 -6:00 Mexico C%sT
1580# Chihuahua
1581Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:40
1582 -7:00 - MST 1927 Jun 10 23:00
1583 -6:00 - CST 1930 Nov 15
1584 -7:00 - MST 1931 May 1 23:00
1585 -6:00 - CST 1931 Oct
1586 -7:00 - MST 1932 Apr 1
1587 -6:00 - CST 1996
1588 -6:00 Mexico C%sT 1998
1589 -6:00 - CST 1998 Apr Sun>=1 3:00
1590 -7:00 Mexico M%sT
1591# Sonora
1592Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
1593 -7:00 - MST 1927 Jun 10 23:00
1594 -6:00 - CST 1930 Nov 15
1595 -7:00 - MST 1931 May 1 23:00
1596 -6:00 - CST 1931 Oct
1597 -7:00 - MST 1932 Apr 1
1598 -6:00 - CST 1942 Apr 24
1599 -7:00 - MST 1949 Jan 14
1600 -8:00 - PST 1970
1601 -7:00 Mexico M%sT 1999
1602 -7:00 - MST
1603# Baja California Sur, Nayarit, Sinaloa
1604Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1605 -7:00 - MST 1927 Jun 10 23:00
1606 -6:00 - CST 1930 Nov 15
1607 -7:00 - MST 1931 May 1 23:00
1608 -6:00 - CST 1931 Oct
1609 -7:00 - MST 1932 Apr 1
1610 -6:00 - CST 1942 Apr 24
1611 -7:00 - MST 1949 Jan 14
1612 -8:00 - PST 1970
1613 -7:00 Mexico M%sT
1614# Baja California
1615Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1616 -7:00 - MST 1924
1617 -8:00 - PST 1927 Jun 10 23:00
1618 -7:00 - MST 1930 Nov 15
1619 -8:00 - PST 1931 Apr 1
1620 -8:00 1:00 PDT 1931 Sep 30
1621 -8:00 - PST 1942 Apr 24
1622 -8:00 1:00 PWT 1945 Nov 12
1623 -8:00 - PST 1948 Apr 5
1624 -8:00 1:00 PDT 1949 Jan 14
1625 -8:00 - PST 1954
1626 -8:00 CA P%sT 1961
1627 -8:00 - PST 1976
1628 -8:00 US P%sT 1996
1629 -8:00 Mexico P%sT 2001
1630 -8:00 US P%sT 2002 Feb 20
1631 -8:00 Mexico P%sT
1632# From Paul Eggert (2001-03-05):
1633# Formerly there was an America/Ensenada zone, which differed from
1634# America/Tijuana only in that it did not observe DST from 1976
1635# through 1995. This was as per Shanks. However, Guy Harris reports
1636# that the 1987 OAG says "Only Ensenada, Mexicale, San Felipe and
1637# Tijuana observe DST," which contradicts Shanks but does imply that
1638# DST-observance was a town-by-town matter back then. This concerns
1639# data after 1970 so most likely there should be at least one Zone
1640# other than America/Tijuana for Baja, but it's not clear yet what its
1641# name or contents should be.
1642#
1643# Revillagigedo Is
1644# no information
1645
1646###############################################################################
1647
1648# Anguilla
1649# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1650Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2
1651 -4:00 - AST
1652
1653# Antigua and Barbuda
1654# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1655Zone America/Antigua -4:07:12 - LMT 1912 Mar 2
1656 -5:00 - EST 1951
1657 -4:00 - AST
1658
1659# Bahamas
1660# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1661Rule Bahamas 1964 max - Oct lastSun 2:00 0 S
1662Rule Bahamas 1964 1986 - Apr lastSun 2:00 1:00 D
1663Rule Bahamas 1987 max - Apr Sun>=1 2:00 1:00 D
1664# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1665Zone America/Nassau -5:09:24 - LMT 1912 Mar 2
1666 -5:00 Bahamas E%sT
1667
1668# Barbados
1669# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1670Rule Barb 1977 only - Jun 12 2:00 1:00 D
1671Rule Barb 1977 1978 - Oct Sun>=1 2:00 0 S
1672Rule Barb 1978 1980 - Apr Sun>=15 2:00 1:00 D
1673Rule Barb 1979 only - Sep 30 2:00 0 S
1674Rule Barb 1980 only - Sep 25 2:00 0 S
1675# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1676Zone America/Barbados -3:58:28 - LMT 1924 # Bridgetown
1677 -3:58:28 - BMT 1932 # Bridgetown Mean Time
1678 -4:00 Barb A%sT
1679
1680# Belize
1681# Whitman entirely disagrees with Shanks; go with Shanks.
1682# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1683Rule Belize 1918 1942 - Oct Sun>=2 0:00 0:30 HD
1684Rule Belize 1919 1943 - Feb Sun>=9 0:00 0 S
1685Rule Belize 1973 only - Dec 5 0:00 1:00 D
1686Rule Belize 1974 only - Feb 9 0:00 0 S
1687Rule Belize 1982 only - Dec 18 0:00 1:00 D
1688Rule Belize 1983 only - Feb 12 0:00 0 S
1689# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1690Zone America/Belize -5:52:48 - LMT 1912 Apr
1691 -6:00 Belize C%sT
1692
1693# Bermuda
1694# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1695Zone Atlantic/Bermuda -4:19:04 - LMT 1930 Jan 1 2:00 # Hamilton
1696 -4:00 - AST 1974 Apr 28 2:00
1697 -4:00 Bahamas A%sT
1698
1699# Cayman Is
1700# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1701Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
1702 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1703 -5:00 - EST
1704
1705# Costa Rica
1706# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1707Rule CR 1979 1980 - Feb lastSun 0:00 1:00 D
1708Rule CR 1979 1980 - Jun Sun>=1 0:00 0 S
1709Rule CR 1991 1992 - Jan Sat>=15 0:00 1:00 D
1710# IATA SSIM (1991-09) says the following was at 1:00; go with Shanks.
1711Rule CR 1991 only - Jul 1 0:00 0 S
1712Rule CR 1992 only - Mar 15 0:00 0 S
1713# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
1714# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1715Zone America/Costa_Rica -5:36:20 - LMT 1890 # San Jose
1716 -5:36:20 - SJMT 1921 Jan 15 # San Jose Mean Time
1717 -6:00 CR C%sT
1718# Coco
1719# no information; probably like America/Costa_Rica
1720
1721# Cuba
1722
1723# From Arthur David Olson (1999-03-29):
1724# The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
1725# the Cuban National Team and the Baltimore Orioles was carried live on
1726# the Orioles Radio Network, including affiliate WTOP in Washington, DC.
1727# During the game, play-by-play announcer Jim Hunter noted that
1728# "We'll be losing two hours of sleep...Cuba switched to Daylight Saving
1729# Time today." (The "two hour" remark referred to losing one hour of
1730# sleep on 1999-03-28--when the announcers were in Cuba as it switched
1731# to DST--and one more hour on 1999-04-04--when the announcers will have
1732# returned to Baltimore, which switches on that date.)
1733
1734# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1735Rule Cuba 1928 only - Jun 10 0:00 1:00 D
1736Rule Cuba 1928 only - Oct 10 0:00 0 S
1737Rule Cuba 1940 1942 - Jun Sun>=1 0:00 1:00 D
1738Rule Cuba 1940 1942 - Sep Sun>=1 0:00 0 S
1739Rule Cuba 1945 1946 - Jun Sun>=1 0:00 1:00 D
1740Rule Cuba 1945 1946 - Sep Sun>=1 0:00 0 S
1741Rule Cuba 1965 only - Jun 1 0:00 1:00 D
1742Rule Cuba 1965 only - Sep 30 0:00 0 S
1743Rule Cuba 1966 only - May 29 0:00 1:00 D
1744Rule Cuba 1966 only - Oct 2 0:00 0 S
1745Rule Cuba 1967 only - Apr 8 0:00 1:00 D
1746Rule Cuba 1967 1968 - Sep Sun>=8 0:00 0 S
1747Rule Cuba 1968 only - Apr 14 0:00 1:00 D
1748Rule Cuba 1969 1977 - Apr lastSun 0:00 1:00 D
1749Rule Cuba 1969 1971 - Oct lastSun 0:00 0 S
1750Rule Cuba 1972 1974 - Oct 8 0:00 0 S
1751Rule Cuba 1975 1977 - Oct lastSun 0:00 0 S
1752Rule Cuba 1978 only - May 7 0:00 1:00 D
1753Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0 S
1754Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
1755Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
1756Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
1757Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
1758Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
1759Rule Cuba 1996 only - Oct 6 0:00s 0 S
1760Rule Cuba 1997 only - Oct 12 0:00s 0 S
1761Rule Cuba 1998 1999 - Mar lastSun 0:00s 1:00 D
1762Rule Cuba 1998 max - Oct lastSun 0:00s 0 S
1763Rule Cuba 2000 max - Apr Sun>=1 0:00s 1:00 D
1764
1765# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1766Zone America/Havana -5:29:28 - LMT 1890
1767 -5:29:36 - HMT 1925 Jul 19 12:00 # Havana MT
1768 -5:00 Cuba C%sT
1769
1770# Dominica
1771# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1772Zone America/Dominica -4:05:36 - LMT 1911 Jul 1 0:01 # Roseau
1773 -4:00 - AST
1774
1775# Dominican Republic
1776
1777# From Steffen Thorsen (2000-10-30):
1778# Enrique Morales reported to me that the Dominican Republic has changed the
1779# time zone to Eastern Standard Time as of Sunday 29 at 2 am....
1780# http://www.listin.com.do/antes/261000/republica/princi.html
1781
1782# From Paul Eggert (2000-12-04):
1783# That URL (2000-10-26, in Spanish) says they planned to use US-style DST.
1784
1785# From Rives McDow (2000-12-01):
1786# Dominican Republic changed its mind and presidential decree on Tuesday,
1787# November 28, 2000, with a new decree. On Sunday, December 3 at 1:00 AM the
1788# Dominican Republic will be reverting to 8 hours from the International Date
1789# Line, and will not be using DST in the foreseeable future. The reason they
1790# decided to use DST was to be in synch with Puerto Rico, who was also going
1791# to implement DST. When Puerto Rico didn't implement DST, the president
1792# decided to revert.
1793
1794
1795# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1796Rule DR 1966 only - Oct 30 0:00 1:00 D
1797Rule DR 1967 only - Feb 28 0:00 0 S
1798Rule DR 1969 1973 - Oct lastSun 0:00 0:30 HD
1799Rule DR 1970 only - Feb 21 0:00 0 S
1800Rule DR 1971 only - Jan 20 0:00 0 S
1801Rule DR 1972 1974 - Jan 21 0:00 0 S
1802# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1803Zone America/Santo_Domingo -4:39:36 - LMT 1890
1804 -4:40 - SDMT 1933 Apr 1 12:00 # S. Dom. MT
1805 -5:00 DR E%sT 1974 Oct 27
1806 -4:00 - AST 2000 Oct 29 02:00
1807 -5:00 US E%sT 2000 Dec 3 01:00
1808 -4:00 - AST
1809
1810# El Salvador
1811# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1812Rule Salv 1987 1988 - May Sun>=1 0:00 1:00 D
1813Rule Salv 1987 1988 - Sep lastSun 0:00 0 S
1814# There are too many San Salvadors elsewhere, so use America/El_Salvador
1815# instead of America/San_Salvador.
1816# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1817Zone America/El_Salvador -5:56:48 - LMT 1921 # San Salvador
1818 -6:00 Salv C%sT
1819
1820# Grenada
1821# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1822Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
1823 -4:00 - AST
1824
1825# Guadeloupe
1826# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1827Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
1828 -4:00 - AST
1829
1830# Guatemala
1831# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1832Rule Guat 1973 only - Nov 25 0:00 1:00 D
1833Rule Guat 1974 only - Feb 24 0:00 0 S
1834Rule Guat 1983 only - May 21 0:00 1:00 D
1835Rule Guat 1983 only - Sep 22 0:00 0 S
1836Rule Guat 1991 only - Mar 23 0:00 1:00 D
1837Rule Guat 1991 only - Sep 7 0:00 0 S
1838# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1839Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5
1840 -6:00 Guat C%sT
1841
1842# Haiti
1843# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1844Rule Haiti 1983 only - May 8 0:00 1:00 D
1845Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
1846Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
1847# Shanks says AT is 2:00, but IATA SSIM (1991/1997) says 1:00s. Go with IATA.
1848Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
1849Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
1850# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1851Zone America/Port-au-Prince -4:49:20 - LMT 1890
1852 -4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
1853 -5:00 Haiti E%sT
1854
1855# Honduras
1856# Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
1857# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1858Zone America/Tegucigalpa -5:48:52 - LMT 1921 Apr
1859 -6:00 Salv C%sT
1860#
1861# Great Swan I ceded by US to Honduras in 1972
1862
1863# Jamaica
1864
1865# From Bob Devine (1988-01-28):
1866# Follows US rules.
1867
1868# From U. S. Naval Observatory (1989-01-19):
1869# JAMAICA 5 H BEHIND UTC
1870
1871# From Shanks:
1872# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1873Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
1874 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1875 -5:00 - EST 1974 Apr 28 2:00
1876 -5:00 US E%sT 1984
1877 -5:00 - EST
1878
1879# Martinique
1880# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1881Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
1882 -4:04:20 - FFMT 1911 May # Fort-de-France MT
1883 -4:00 - AST 1980 Apr 6
1884 -4:00 1:00 ADT 1980 Sep 28
1885 -4:00 - AST
1886
1887# Montserrat
1888# From Paul Eggert (1997-08-31):
1889# Recent volcanic eruptions have forced evacuation of Plymouth, the capital.
1890# Luckily, Olveston, the current de facto capital, has the same longitude.
1891# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1892Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Olveston
1893 -4:00 - AST
1894
1895# Nicaragua
1896#
1897# From Steffen Thorsen (1998-12-29):
1898# Nicaragua seems to be back at -6:00 but I have not been able to find when
1899# they changed from -5:00.
1900#
1901# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1902Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D
1903Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S
1904Rule Nic 1992 only - Jan 1 4:00 1:00 D
1905Rule Nic 1992 only - Sep 24 0:00 0 S
1906# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1907Zone America/Managua -5:45:08 - LMT 1890
1908 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time?
1909 -6:00 - CST 1973 May
1910 -5:00 - EST 1975 Feb 16
1911 -6:00 Nic C%sT 1993 Jan 1 4:00
1912 -5:00 - EST 1998 Dec
1913 -6:00 - CST
1914
1915# Panama
1916# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1917Zone America/Panama -5:18:08 - LMT 1890
1918 -5:19:36 - CMT 1908 Apr 22 # Colon Mean Time
1919 -5:00 - EST
1920
1921# Puerto Rico
1922# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
1923# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1924Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
1925 -4:00 - AST 1942 May 3
1926 -4:00 1:00 AWT 1945 Sep 30 2:00
1927 -4:00 - AST
1928
1929# St Kitts-Nevis
1930# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1931Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
1932 -4:00 - AST
1933
1934# St Lucia
1935# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1936Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
1937 -4:04:00 - CMT 1912 # Castries Mean Time
1938 -4:00 - AST
1939
1940# St Pierre and Miquelon
1941# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
1942# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1943Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
1944 -4:00 - AST 1980 May
1945 -3:00 - PMST 1987 # Pierre & Miquelon Time
1946 -3:00 Canada PM%sT
1947
1948# St Vincent and the Grenadines
1949# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1950Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
1951 -4:04:56 - KMT 1912 # Kingstown Mean Time
1952 -4:00 - AST
1953
1954# Turks and Caicos
1955# From Paul Eggert (1998-08-06):
1956# Shanks says they use US DST rules, but IATA SSIM (1991/1998)
1957# says they switch at midnight. Go with IATA SSIM.
1958# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1959Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
1960Rule TC 1979 max - Oct lastSun 0:00 0 S
1961Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
1962# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1963Zone America/Grand_Turk -4:44:32 - LMT 1890
1964 -5:07:12 - KMT 1912 Feb # Kingston Mean Time
1965 -5:00 TC E%sT
1966
1967# British Virgin Is
1968# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1969Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
1970 -4:00 - AST
1971
1972# Virgin Is
1973# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1974Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
1975 -4:00 - AST
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