>From 3a1b1b3d4a06588a584c9fd3f98ba3865d9123e6 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Fri, 9 Jun 2017 15:17:36 -0700 Subject: [PROPOSED] Fix Alaska times before 1868 * NEWS: Document the change. * northamerica (America/Juneau, America/Sitka, America/Metlakatla) (America/Yakutat, America/Anchorage, America/Nome, America/Adak): Do the 1867 transition on October 18 at 15:30 Sitka time. (America/Nome, America/Adak): Fix off-by-one errors in pre-1867 LMT that were reported by Michael Deckers. --- NEWS | 9 +++++++++ northamerica | 50 ++++++++++++++++++++++++++++++++------------------ 2 files changed, 41 insertions(+), 18 deletions(-) diff --git a/NEWS b/NEWS index 75911d4..aa33eb3 100644 --- a/NEWS +++ b/NEWS @@ -11,6 +11,15 @@ Unreleased, experimental changes Europe/Dublin's 1946 and 1947 fallback transitions occurred at 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) + Adjust the 1867 transition in Alaska to better reflect the + historical record, by changing it to occur on 1867-10-18 at 15:30 + Sitka time rather than at the start of 1867-10-17 local time. + Although strictly speaking this is accurate only for Sitka, + the rest of Alaska's blanks need to be filled in somehow. + + Fix off-by-one errors in UT offsets for Adak and Nome before 1867. + (Thanks to Michael Deckers.) + Add 7 s to the UT offset in Asia/Yangon before 1920. Changes to build procedure diff --git a/northamerica b/northamerica index 6ede9dc..6ba49fc 100644 --- a/northamerica +++ b/northamerica @@ -492,20 +492,34 @@ Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 # Alaska # AK%sT is the modern abbreviation for -09 per USNO. # -# From Paul Eggert (2001-05-30): +# From Paul Eggert (2017-06-09): # 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 +# This was on 1867-10-18, a Friday. Lovell Rousseau wrote that the ceremony +# took place at 15:30 precisely, marked by a salute fired from the man-of-war +# Ossipee; see 40th Congress, 2d session, Ex. Doc No. 125, p 4. +# Presumably 1867-10-18 is the Gregorian date of the ceremony. +# Inhabitants of Sitka did not change their calendars until Sunday, +# 1867-10-20, which they celebrated twice; see Ahllund T (tr Hallamaa P). +# From the memoirs of a Finnish workman. Alaska History. 2006 Fall;21(2):1-25. +# http://alaskahistoricalsociety.org/wp-content/uploads/2016/12/Ahllund-2006-Memoirs-of-a-Finnish-Workman.pdf +# Include only the time zone part of this transition, ignoring the switch +# from Julian to Gregorian, since we can't represent the Julian calendar. +# +# As far as we know, of the locations mentioned below only Sitka was # permanently inhabited in 1867 by anyone using either calendar. -# (Yakutat was colonized by the Russians in 1799, but the settlement -# was destroyed in 1805 by a Yakutat-kon war party.) However, there -# were nearby inhabitants in some cases and for our purposes perhaps -# it's best to simply use the official transition. +# (Yakutat was colonized by the Russians in 1799, but the settlement was +# destroyed in 1805 by a Yakutat-kon war party.) Many of Alaska's inhabitants +# were unaware of the US acquisition of Alaska, much less of any calendar or +# time change. However, the Russian-influenced part of Alaska did observe +# Russian time, and it is more accurate to model this than to ignore it. +# The database format requires an exact transition time; use the Ossipee's +# salute as a somewhat-arbitrary point of transition for all of Alaska. +# Sitka's UTC offset is -9:01:13, so adjust its 15:30 to the local times of +# Alaskan locations, as follows: 12:44:25 for Adak (-11:46:38), 13:29:25 for +# Nome (-11:01:38), 14:31:23 for Anchorage (-9:59:36), 15:22:42 for Yakutat +# (-9:18:55), 15:33:32 for Juneau (-8:57:41), and 15:44:55 for Metlakatla +# (-8:46:18). # From Paul Eggert (2014-07-18): # One opinion of the early-1980s turmoil in Alaska over time zones and @@ -561,7 +575,7 @@ Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 # http://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/ # Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 +Zone America/Juneau 15:02:19 - LMT 1867 Oct 19 15:33:32 -8:57:41 - LMT 1900 Aug 20 12:00 -8:00 - PST 1942 -8:00 US P%sT 1946 @@ -571,7 +585,7 @@ Zone America/Juneau 15:02:19 - LMT 1867 Oct 18 -8:00 US P%sT 1983 Oct 30 2:00 -9:00 US Y%sT 1983 Nov 30 -9:00 US AK%sT -Zone America/Sitka 14:58:47 - LMT 1867 Oct 18 +Zone America/Sitka 14:58:47 - LMT 1867 Oct 19 15:30 -9:01:13 - LMT 1900 Aug 20 12:00 -8:00 - PST 1942 -8:00 US P%sT 1946 @@ -579,7 +593,7 @@ Zone America/Sitka 14:58:47 - LMT 1867 Oct 18 -8:00 US P%sT 1983 Oct 30 2:00 -9:00 US Y%sT 1983 Nov 30 -9:00 US AK%sT -Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18 +Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 19 15:44:55 -8:46:18 - LMT 1900 Aug 20 12:00 -8:00 - PST 1942 -8:00 US P%sT 1946 @@ -587,14 +601,14 @@ Zone America/Metlakatla 15:13:42 - LMT 1867 Oct 18 -8:00 US P%sT 1983 Oct 30 2:00 -8:00 - PST 2015 Nov 1 2:00 -9:00 US AK%sT -Zone America/Yakutat 14:41:05 - LMT 1867 Oct 18 +Zone America/Yakutat 14:41:05 - LMT 1867 Oct 19 15:22:42 -9:18:55 - LMT 1900 Aug 20 12:00 -9:00 - YST 1942 -9:00 US Y%sT 1946 -9:00 - YST 1969 -9:00 US Y%sT 1983 Nov 30 -9:00 US AK%sT -Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 +Zone America/Anchorage 14:00:24 - LMT 1867 Oct 19 14:31:23 -9:59:36 - LMT 1900 Aug 20 12:00 -10:00 - AST 1942 -10:00 US A%sT 1967 Apr @@ -602,7 +616,7 @@ Zone America/Anchorage 14:00:24 - LMT 1867 Oct 18 -10:00 US AH%sT 1983 Oct 30 2:00 -9:00 US Y%sT 1983 Nov 30 -9:00 US AK%sT -Zone America/Nome 12:58:21 - LMT 1867 Oct 18 +Zone America/Nome 12:58:22 - LMT 1867 Oct 19 13:29:25 -11:01:38 - LMT 1900 Aug 20 12:00 -11:00 - NST 1942 -11:00 US N%sT 1946 @@ -611,7 +625,7 @@ Zone America/Nome 12:58:21 - LMT 1867 Oct 18 -11:00 US B%sT 1983 Oct 30 2:00 -9:00 US Y%sT 1983 Nov 30 -9:00 US AK%sT -Zone America/Adak 12:13:21 - LMT 1867 Oct 18 +Zone America/Adak 12:13:22 - LMT 1867 Oct 19 12:44:25 -11:46:38 - LMT 1900 Aug 20 12:00 -11:00 - NST 1942 -11:00 US N%sT 1946 -- 2.9.4