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# US Pacific time, represented by Los Angeles## California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,# Idaho, Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties),# most of Nevada, most of Oregon, and Washington## Rule NAME FROM TO TYPE IN ON AT SAVE LETTERRule CA 1948 only - Mar 14 2:00 1:00 DRule CA 1949 only - Jan 1 2:00 0 SRule CA 1950 1966 - Apr lastSun 2:00 1:00 DRule CA 1950 1961 - Sep lastSun 2:00 0 SRule CA 1962 1966 - Oct lastSun 2:00 0 S# Zone NAME GMTOFF RULES FORMAT [UNTIL]Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 -8:00 US P%sT 1946 -8:00 CA P%sT 1967 -8:00 US P%sT# Alaska# AK%sT is the modern abbreviation for -9:00 per USNO.## From Paul Eggert (2001-05-30):# Howse writes that Alaska switched from the Julian to the Gregorian calendar,# and from east-of-GMT to west-of-GMT days, when the US bought it from Russia.# This was on 1867-10-18, a Friday; the previous day was 1867-10-06 Julian,# also a Friday. Include only the time zone part of this transition,# ignoring the switch from Julian to Gregorian, since we can't represent# the Julian calendar.## As far as we know, none of the exact locations mentioned below were# permanently inhabited in 1867 by anyone using either calendar.# (Yakutat was colonized by the Russians in 1799, but the settlement# was destroyed in 1805 by a Yakutat-kon war party.) However, there# were nearby inhabitants in some cases and for our purposes perhaps# it's best to simply use the official transition.## Zone NAME GMTOFF RULES FORMAT [UNTIL]Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 -8:57:41 - LMT 1900 Aug 20 12:00 -8:00 - PST 1942 -8:00 US P%sT 1946 -8:00 - PST 1969 -8:00 US P%sT 1983 Oct 30 2:00 -9:00 US Y%sT 1983 Nov 30 -9:00 US AK%sTZone America/Yakutat 14:41:05 - LMT 1867 Oct 18 -9:18:55 - LMT 1900 Aug 20 12:00 -9:00 - YST 1942 -9:00 US Y%sT 1946 -9:00 - YST 1969 -9:00 US Y%sT 1983 Nov 30 -9:00 US AK%sTZone America/Anchorage 14:00:24 - LMT 1867 Oct 18 -9:59:36 - LMT 1900 Aug 20 12:00 -10:00 - CAT 1942 -10:00 US CAT/CAWT 1946 -10:00 - CAT 1967 Apr -10:00 - AHST 1969 -10:00 US AH%sT 1983 Oct 30 2:00 -9:00 US Y%sT 1983 Nov 30 -9:00 US AK%sTZone America/Nome 12:58:21 - LMT 1867 Oct 18 -11:01:38 - LMT 1900 Aug 20 12:00 -11:00 - NST 1942 -11:00 US N%sT 1946 -11:00 - NST 1967 Apr -11:00 - BST 1969 -11:00 US B%sT 1983 Oct 30 2:00 -9:00 US Y%sT 1983 Nov 30 -9:00 US AK%sTZone America/Adak 12:13:21 - LMT 1867 Oct 18 -11:46:38 - LMT 1900 Aug 20 12:00 -11:00 - NST 1942 -11:00 US N%sT 1946 -11:00 - NST 1967 Apr -11:00 - BST 1969 -11:00 US B%sT 1983 Oct 30 2:00 -10:00 US AH%sT 1983 Nov 30 -10:00 US HA%sT# The following switches don't quite make our 1970 cutoff.## Shanks writes that part of southwest Alaska (e.g. Aniak)# switched from -11:00 to -10:00 on 1968-09-22 at 02:00,# and another part (e.g. Akiak) made the same switch five weeks later.## From David Flater (2004-11-09):# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska# Historic Preservation Commission, provided this information, which# suggests that Unalaska deviated from statutory time from early 1967# possibly until 1983:## Minutes of the Unalaska City Council Meeting, January 10, 1967:# "Except for St. Paul and Akutan, Unalaska is the only important# location not on Alaska Standard Time. The following resolution was# made by William Robinson and seconded by Henry Swanson: Be it# resolved that the City of Unalaska hereby goes to Alaska Standard# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday,# January 14, Alaska Standard Time.) This resolution was passed with# three votes for and one against."# Hawaii## From Arthur David Olson:# And then there's Hawaii.# DST was observed for one day in 1933;# standard time was changed by half an hour in 1947;# it's always standard as of 1986.## From Paul Eggert:# Shanks says the 1933 experiment lasted for three weeks. Go with Shanks.#Zone Pacific/Honolulu -10:31:26 - LMT 1900 Jan 1 12:00 -10:30 - HST 1933 Apr 30 2:00 -10:30 1:00 HDT 1933 May 21 2:00 -10:30 US H%sT 1947 Jun 8 2:00 -10:00 - HST# Now we turn to US areas that have diverged from the consensus since 1970.# Arizona mostly uses MST.# From Paul Eggert (2002-10-20):## The information in the rest of this paragraph is derived from the# <a href="http://www.dlapr.lib.az.us/links/daylight.htm"># Daylight Saving Time web page (2002-01-23)</a> maintained by the# Arizona State Library, Archives and Public Records.# Between 1944-01-01 and 1944-04-01 the State of Arizona used standard# time, but by federal law railroads, airlines, bus lines, military# personnel, and some engaged in interstate commerce continued to# observe war (i.e., daylight saving) time. The 1944-03-17 Phoenix# Gazette says that was the date the law changed, and that 04-01 was# the date the state's clocks would change. In 1945 the State of# Arizona used standard time all year, again with exceptions only as# mandated by federal law. Arizona observed DST in 1967, but Arizona# Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.## Shanks says the 1944 experiment came to an end on 1944-03-17.# Go with the Arizona State Library instead.Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 -7:00 US M%sT 1944 Jan 1 00:01 -7:00 - MST 1944 Apr 1 00:01 -7:00 US M%sT 1944 Oct 1 00:01 -7:00 - MST 1967 -7:00 US M%sT 1968 Mar 21 -7:00 - MST# From Arthur David Olson (1988-02-13):# A writer from the Inter Tribal Council of Arizona, Inc.,# notes in private correspondence dated 1987-12-28 that "Presently, only the# Navajo Nation participates in the Daylight Saving Time policy, due to its# large size and location in three states." (The "only" means that other# tribal nations don't use DST.)Link America/Denver America/Shiprock# Southern Idaho (Ada, Adams, Bannock, Bear Lake, Bingham, Blaine,# Boise, Bonneville, Butte, Camas, Canyon, Caribou, Cassia, Clark,# Custer, Elmore, Franklin, Fremont, Gem, Gooding, Jefferson, Jerome,# Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,# Teton, Twin Falls, Valley, Washington counties) and eastern Oregon# switched four weeks late in 1974.## Zone NAME GMTOFF RULES FORMAT [UNTIL]Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 -8:00 US P%sT 1923 May 13 2:00 -7:00 US M%sT 1974 -7:00 - MST 1974 Feb 3 2:00 -7:00 US M%sT# Indiana## For a map of Indiana's time zone regions, see:# <a href="http://www.mccsc.edu/time.html"># What time is it in Indiana?# </a> (2005-05-03)## From Paul Eggert (2005-08-22):# Since 1970, most of Indiana has been like America/Indiana/Indianapolis,# with the following exceptions:## - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,# Vandenburgh, and Warrick counties have been like America/Chicago.## - Dearborn and Ohio counties have been like America/New_York.## - Clark, Floyd, and Harrison counties have been like# America/Kentucky/Louisville.## - Crawford, Starke, and Switzerland counties have their own time zone# histories as noted below.## Shanks partitions Indiana into 345 regions, each with its own time history,# and writes ``Even newspaper reports present contradictory information.''# Fortunately, most of the complexity occurred before our cutoff date of 1970.## Other than Indianapolis, the Indiana place names are so nondescript# that they would be ambiguous if we left them at the `America' level.# So we reluctantly put them all in a subdirectory `America/Indiana'.# From Paul Eggert (2005-08-16):# http://www.mccsc.edu/time.html says that Indiana will use DST starting 2006,# and that many counties may switch either to Central or to Eastern time.# The county-by-county decisions have not been made yet, so for now assume# that no counties will switch: this assumption is most likely wrong,# but it's the best we can do for now.# Rule NAME FROM TO TYPE IN ON AT SAVE LETTERRule Indianapolis 1941 only - Jun 22 2:00 1:00 DRule Indianapolis 1941 1954 - Sep lastSun 2:00 0 SRule Indianapolis 1946 1954 - Apr lastSun 2:00 1:00 D# Zone NAME GMTOFF RULES FORMAT [UNTIL]Zone America/Indiana/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:15:22 -6:00 US C%sT 1920 -6:00 Indianapolis C%sT 1942 -6:00 US C%sT 1946 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 -5:00 - EST 1957 Sep 29 2:00 -6:00 - CST 1958 Apr 27 2:00 -5:00 - EST 1969 -5:00 US E%sT 1971 -5:00 - EST 2006 -5:00 US E%sT## Part of Crawford County, Indiana, last observed DST in 1975,# and left its clocks alone in 1974.# Rule NAME FROM TO TYPE IN ON AT SAVE LETTERRule Marengo 1951 only - Apr lastSun 2:00 1:00 DRule Marengo 1951 only - Sep lastSun 2:00 0 SRule Marengo 1954 1960 - Apr lastSun 2:00 1:00 DRule Marengo 1954 1960 - Sep lastSun 2:00 0 S# Zone NAME GMTOFF RULES FORMAT [UNTIL]Zone America/Indiana/Marengo -5:45:23 - LMT 1883 Nov 18 12:14:37 -6:00 US C%sT 1951 -6:00 Marengo C%sT 1961 Apr 30 2:00 -5:00 - EST 1969 -5:00 US E%sT 1974 Jan 6 2:00 -6:00 1:00 CDT 1974 Oct 27 2:00 -5:00 US E%sT 1976 -5:00 - EST 2006 -5:00 US E%sT## Starke County, Indiana# From Arthur David Olson (1991-10-28):# An article on page A3 of the Sunday, 1991-10-27 Washington Post# notes that Starke County switched from Central time to Eastern time as of# 1991-10-27.# Rule NAME FROM TO TYPE IN ON AT SAVE LETTERRule Starke 1947 1961 - Apr lastSun 2:00 1:00 DRule Starke 1947 1954 - Sep lastSun 2:00 0 SRule Starke 1955 1956 - Oct lastSun 2:00 0 SRule Starke 1957 1958 - Sep lastSun 2:00 0 SRule Starke 1959 1961 - Oct lastSun 2:00 0 S# Zone NAME GMTOFF RULES FORMAT [UNTIL]Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 -6:00 US C%sT 1947 -6:00 Starke C%sT 1962 Apr 29 2:00 -5:00 - EST 1963 Oct 27 2:00 -6:00 US C%sT 1991 Oct 27 2:00 -5:00 - EST 2006 -5:00 US E%sT## Switzerland County, Indiana, last observed DST in 1972.# Zone NAME GMTOFF RULES FORMAT [UNTIL]Zone America/Indiana/Vevay -5:40:16 - LMT 1883 Nov 18 12:19:44 -6:00 US C%sT 1954 Apr 25 2:00 -5:00 - EST 1969 -5:00 US E%sT 1973 -5:00 - EST 2006 -5:00 US E%sT# Part of Kentucky left its clocks alone in 1974.# This also includes Clark, Floyd, and Harrison counties in Indiana.# Rule NAME FROM TO TYPE IN ON AT SAVE LETTERRule Louisville 1921 only - May 1 2:00 1:00 DRule Louisville 1921 only - Sep 1 2:00 0 SRule Louisville 1941 1961 - Apr lastSun 2:00 1:00 DRule Louisville 1941 only - Sep lastSun 2:00 0 SRule Louisville 1946 only - Jun 2 2:00 0 SRule Louisville 1950 1955 - Sep lastSun 2:00 0 SRule Louisville 1956 1960 - Oct lastSun 2:00 0 S# Zone NAME GMTOFF RULES FORMAT [UNTIL]Zone America/Kentucky/Louisville -5:43:02 - LMT 1883 Nov 18 12:16:58 -6:00 US C%sT 1921 -6:00 Louisville C%sT 1942 -6:00 US C%sT 1946 -6:00 Louisville C%sT 1961 Jul 23 2:00 -5:00 - EST 1968 -5:00 US E%sT 1974 Jan 6 2:00 -6:00 1:00 CDT 1974 Oct 27 2:00 -5:00 US E%sT## Wayne, Clinton, and Russell Counties, Kentucky## From# <a href="http://www.lake-cumberland.com/life/archive/news990129time.shtml"># Lake Cumberland LIFE# </a> (1999-01-29) via WKYM-101.7:# Clinton County has joined Wayne County in asking the DoT to change from# the Central to the Eastern time zone.... The Wayne County government made# the same request in December. And while Russell County officials have not# taken action, the majority of respondents to a poll conducted there in# August indicated they would like to change to "fast time" also.# The three Lake Cumberland counties are the farthest east of any U.S.# location in the Central time zone.## From Rich Wales (2000-08-29):# After prolonged debate, and despite continuing deep differences of opinion,# Wayne County (central Kentucky) is switching from Central (-0600) to Eastern# (-0500) time. They won't "fall back" this year. See Sara Shipley,# The difference an hour makes, Nando Times (2000-08-29 15:33 -0400).## From Paul Eggert (2001-07-16):# The final rule was published in the
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