20
20
# Howse writes (pp 121-125) that time zones were invented by
21
21
# Professor Charles Ferdinand Dowd (1825-1904),
22
22
# Principal of Temple Grove Ladies' Seminary (Saratoga Springs, NY).
23
# His pamphlet ``A System of National Time for Railroads'' (1870)
23
# His pamphlet "A System of National Time for Railroads" (1870)
24
24
# was the result of his proposals at the Convention of Railroad Trunk Lines
25
25
# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
26
26
# but in 1872-05 he moved the proposed origin to Greenwich.
41
41
# From Paul Eggert (2001-03-06):
42
42
# Daylight Saving Time was first suggested as a joke by Benjamin Franklin
43
# in his whimsical essay ``An Economical Project for Diminishing the Cost
44
# of Light'' published in the Journal de Paris (1784-04-26).
43
# in his whimsical essay "An Economical Project for Diminishing the Cost
44
# of Light" published in the Journal de Paris (1784-04-26).
45
45
# Not everyone is happy with the results:
47
47
# I don't really care how time is reckoned so long as there is some
167
167
# of the Aleutian islands. No DST.
169
169
# From Paul Eggert (1995-12-19):
170
# The tables below use `NST', not `NT', for Nome Standard Time.
171
# I invented `CAWT' for Central Alaska War Time.
170
# The tables below use 'NST', not 'NT', for Nome Standard Time.
171
# I invented 'CAWT' for Central Alaska War Time.
173
173
# From U. S. Naval Observatory (1989-01-19):
174
174
# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
237
237
# H.R. 6, Energy Policy Act of 2005, SEC. 110. DAYLIGHT SAVINGS.
238
238
# (a) Amendment- Section 3(a) of the Uniform Time Act of 1966 (15
239
239
# U.S.C. 260a(a)) is amended--
240
# (1) by striking `first Sunday of April' and inserting `second
240
# (1) by striking 'first Sunday of April' and inserting 'second
241
241
# Sunday of March'; and
242
# (2) by striking `last Sunday of October' and inserting `first
242
# (2) by striking 'last Sunday of October' and inserting 'first
243
243
# Sunday of November'.
244
244
# (b) Effective Date- Subsection (a) shall take effect 1 year after the
245
245
# date of enactment of this Act or March 1, 2007, whichever is later.
636
638
# Navajo Nation participates in the Daylight Saving Time policy, due to its
637
639
# large size and location in three states." (The "only" means that other
638
640
# tribal nations don't use DST.)
640
Link America/Denver America/Shiprock
642
# From Paul Eggert (2013-08-26):
643
# See America/Denver for a zone appropriate for the Navajo Nation.
642
645
# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,
643
646
# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,
677
680
# and Switzerland counties have their own time zone histories as noted below.
679
682
# Shanks partitioned Indiana into 345 regions, each with its own time history,
680
# and wrote ``Even newspaper reports present contradictory information.''
683
# and wrote "Even newspaper reports present contradictory information."
681
684
# Those Hoosiers! Such a flighty and changeable people!
682
685
# Fortunately, most of the complexity occurred before our cutoff date of 1970.
684
687
# Other than Indianapolis, the Indiana place names are so nondescript
685
# that they would be ambiguous if we left them at the `America' level.
686
# So we reluctantly put them all in a subdirectory `America/Indiana'.
688
# that they would be ambiguous if we left them at the 'America' level.
689
# So we reluctantly put them all in a subdirectory 'America/Indiana'.
688
691
# From Paul Eggert (2005-08-16):
689
692
# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006.
947
950
# This story is too entertaining to be false, so go with Howse over Shanks.
949
952
# From Paul Eggert (2001-03-06):
950
# Garland (1927) writes ``Cleveland and Detroit advanced their clocks
951
# one hour in 1914.'' This change is not in Shanks. We have no more
953
# Garland (1927) writes "Cleveland and Detroit advanced their clocks
954
# one hour in 1914." This change is not in Shanks. We have no more
952
955
# info, so omit this for now.
954
957
# Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
988
991
# occupied 1857/1900 by the Navassa Phosphate Co
989
992
# US lighthouse 1917/1996-09
990
993
# currently uninhabited
991
# see Mark Fineman, ``An Isle Rich in Guano and Discord'',
994
# see Mark Fineman, "An Isle Rich in Guano and Discord",
992
995
# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
993
996
# Jimmy Skaggs, _The Great Guano Rush_ (1994).
1343
# From Paul Eggert (2006-07-09):
1344
# Shanks & Pottenger write that since 1970 most of Quebec has been
1346
# From Paul Eggert (2013-08-30):
1347
# Since 1970 most of Quebec has been like Toronto.
1348
# However, because earlier versions of the tz database mistakenly relied on data
1349
# from Shanks & Pottenger saying that Quebec differed from Ontario after 1970,
1350
# a separate entry was created for most of Quebec. We're loath to lose
1351
# its pre-1970 info, even though the tz database is normally limited to
1352
# zones that differ after 1970, so keep this otherwise out-of-scope entry.
1347
# From Paul Eggert (2006-06-27):
1348
1354
# Matthews and Vincent (1998) also write that Quebec east of the -63
1349
1355
# meridian is supposed to observe AST, but residents as far east as
1350
1356
# Natashquan use EST/EDT, and residents east of Natashquan use AST.
1351
# In "Official time in Quebec" the Quebec department of justice writes in
1352
# http://www.justice.gouv.qc.ca/english/publications/generale/temps-regl-1-a.htm
1353
# that "The residents of the Municipality of the
1354
# Cote-Nord-du-Golfe-Saint-Laurent and the municipalities of Saint-Augustin,
1355
# Bonne-Esperance and Blanc-Sablon apply the Official Time Act as it is
1356
# written and use Atlantic standard time all year round. The same applies to
1357
# the residents of the Native facilities along the lower North Shore."
1358
# <http://www.assnat.qc.ca/eng/37legislature2/Projets-loi/Publics/06-a002.htm>
1357
# The Quebec department of justice writes in
1358
# "The situation in Minganie and Basse-Cote-Nord"
1359
# http://www.justice.gouv.qc.ca/english/publications/generale/temps-minganie-a.htm
1360
# that the coastal strip from just east of Natashquan to Blanc-Sablon
1361
# observes Atlantic standard time all year round.
1362
# http://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
1359
1363
# says this common practice was codified into law as of 2007.
1360
1364
# For lack of better info, guess this practice began around 1970, contra to
1361
1365
# Shanks & Pottenger who have this region observing AST/ADT.
1366
# for post-1970 data America/Puerto_Rico.
1363
1368
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1364
1369
Rule Mont 1917 only - Mar 25 2:00 1:00 D
2208
2212
# From Paul Eggert (1996-06-12):
2209
2213
# For an English translation of the decree, see
2210
2214
# <a href="http://mexico-travel.com/extra/timezone_eng.html">
2211
# ``Diario Oficial: Time Zone Changeover'' (1996-01-04).
2215
# "Diario Oficial: Time Zone Changeover" (1996-01-04).
2214
2218
# From Rives McDow (1998-10-08):
2616
2618
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2617
2619
Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
2618
2620
-4:00 - AST 1974 Apr 28 2:00
2619
-4:00 Bahamas A%sT 1976
2621
-4:00 Canada A%sT 1976
2623
2625
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2624
2626
Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
2625
-5:07:12 - KMT 1912 Feb # Kingston Mean Time
2627
-5:07:11 - KMT 1912 Feb # Kingston Mean Time
2637
2639
# go with Shanks & Pottenger.
2638
2640
Rule CR 1991 only - Jul 1 0:00 0 S
2639
2641
Rule CR 1992 only - Mar 15 0:00 0 S
2640
# There are too many San Joses elsewhere, so we'll use `Costa Rica'.
2642
# There are too many San Joses elsewhere, so we'll use 'Costa Rica'.
2641
2643
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2642
2644
Zone America/Costa_Rica -5:36:13 - LMT 1890 # San Jose
2643
2645
-5:36:13 - SJMT 1921 Jan 15 # San Jose Mean Time
2920
2920
-6:00 Salv C%sT
2923
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2924
Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's
2928
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
2929
Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe a Pitre
2931
2924
# St Barthelemy
2932
Link America/Guadeloupe America/St_Barthelemy
2933
2925
# St Martin (French part)
2934
Link America/Guadeloupe America/Marigot
2926
# See 'southamerica'.
3074
3066
# Great Swan I ceded by US to Honduras in 1972
3078
# From Bob Devine (1988-01-28):
3081
# From U. S. Naval Observatory (1989-01-19):
3082
# JAMAICA 5 H BEHIND UTC
3084
# From Shanks & Pottenger:
3069
# Shanks & Pottenger give -5:07:12, but Milne records -5:07:10.41 from an
3070
# unspecified official document, and says "This time is used throughout the
3071
# island". Go with Milne. Round to the nearest second as required by zic.
3085
3072
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3086
Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
3087
-5:07:12 - KMT 1912 Feb # Kingston Mean Time
3073
Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
3074
-5:07:11 - KMT 1912 Feb # Kingston Mean Time
3088
3075
-5:00 - EST 1974 Apr 28 2:00
3089
3076
-5:00 US E%sT 1984
3101
# From Paul Eggert (2006-03-22):
3102
# In 1995 volcanic eruptions forced evacuation of Plymouth, the capital.
3103
# world.gazetteer.com says Cork Hill is the most populous location now.
3104
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3105
Zone America/Montserrat -4:08:52 - LMT 1911 Jul 1 0:01 # Cork Hill
3088
# See 'southamerica'.
3180
# There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
3162
# There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
3181
3163
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3182
3164
Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
3183
3165
-4:00 - AST 1942 May 3
3187
3169
# St Kitts-Nevis
3188
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3189
Zone America/St_Kitts -4:10:52 - LMT 1912 Mar 2 # Basseterre
3193
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3194
Zone America/St_Lucia -4:04:00 - LMT 1890 # Castries
3195
-4:04:00 - CMT 1912 # Castries Mean Time
3171
# See 'southamerica'.
3198
3173
# St Pierre and Miquelon
3199
# There are too many St Pierres elsewhere, so we'll use `Miquelon'.
3174
# There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
3200
3175
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3201
3176
Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
3202
3177
-4:00 - AST 1980 May
3237
3209
Rule TC 2007 max - Nov Sun>=1 2:00 0 S
3238
3210
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3239
3211
Zone America/Grand_Turk -4:44:32 - LMT 1890
3240
-5:07:12 - KMT 1912 Feb # Kingston Mean Time
3212
-5:07:11 - KMT 1912 Feb # Kingston Mean Time
3243
3215
# British Virgin Is
3244
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3245
Zone America/Tortola -4:18:28 - LMT 1911 Jul # Road Town
3249
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
3250
Zone America/St_Thomas -4:19:44 - LMT 1911 Jul # Charlotte Amalie
3217
# See 'southamerica'.