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tzdata/backport-Fix-several-pre-1957-transitions-for-Bermuda.patch
SuperSix173 0d433f72a8 backport community patches
2020-11-30 10:50:28 +08:00

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From 17acee8cbb75aaf7bca5decc4fc6c9ab27533537 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 24 Nov 2020 22:05:38 -0800
Subject: [PATCH] Fix several pre-1957 transitions for Bermuda
(Thanks to P Chan.)
* NEWS: Mention this.
* northamerica (Bermuda): New ruleset.
(Atlantic/Bermuda): Use it before 1974.
* theory.html (Time zone abbreviations): Mention BMT/BST,
which are my invention.
---
NEWS | 5 ++--
northamerica | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
theory.html | 5 ++--
3 files changed, 97 insertions(+), 8 deletions(-)
diff --git a/NEWS b/NEWS
index f7b0461..d9fe116 100644
--- a/NEWS
+++ b/NEWS
@@ -4,9 +4,10 @@ Unreleased, experimental changes
Changes to past timestamps
- Correct several pre-1972 transitions, fixing entries originally
+ Correct many pre-1986 transitions, fixing entries originally
derived from Shanks. The fixes include:
- - Australia: several 1917 through 1971 transitions.
+ - Australia: several 1917 through 1971 transitions
+ - Bermuda: several 1917 through 1956 transitions
- Belize: several 1942 through 1968 transitions
- Israel and Palestine: several 1940 through 1985 transitions
- Kenya and adjacent: several 1908 through 1960 transitions
diff --git a/northamerica b/northamerica
index 6a66617..d5abf21 100644
--- a/northamerica
+++ b/northamerica
@@ -3018,20 +3018,107 @@ Zone America/Belize -5:52:48 - LMT 1912 Apr 1
# Bermuda
+# From Paul Eggert (2020-11-24):
# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
-# Bermuda dockyard, Ireland I; round that.
+# Bermuda dockyard, Ireland I. This agrees with standard offset given in the
+# Daylight Saving Act, 1917 cited below. Round that to the nearest second.
+# It is not known when this time became standard for Bermuda; guess 1890.
+# The transition to -04 was specified by:
+# 1930: The Time Zone Act, 1929 (1929: No. 39) [1929-11-08]
+# https://books.google.com/books?id=7tdMAQAAIAAJ&pg=RA54-PP1
+
+# From P Chan (2020-11-20):
+# Most of the information can be found online from the Bermuda National
+# Library - Digital Collection which includes The Royal Gazette (RG) until 1957
+# https://bnl.contentdm.oclc.org/digital/
+# I will cite the ID. For example, [10000] means
+# https://bnl.contentdm.oclc.org/digital/collection/BermudaNP02/id/10000
+#
+# 1917: Apr 5 midnight to Sep 30 midnight
+# Daylight Saving Act, 1917 (1917 No. 13) [1917-04-02]
+# Bermuda Acts and Resolves 1917, p 37-38
+# https://books.google.com/books?id=M-lCAQAAMAAJ&pg=PA36-IA2
+# RG, 1917-04-04, p 6 [42340] gives the spring forward date.
+#
+# 1918: Apr 13 midnight to Sep 15 midnight
+# Daylight Saving Act, 1918 (1918 No. 9) [1918-04-06]
+# Bermuda Acts and Resolves 1917, p 13
+# https://books.google.com/books?id=K-lCAQAAMAAJ&pg=RA1-PA7
+#
+# Note that local mean time was still used before 1930.
+#
+# During WWII, DST was introduced by Defence Regulations
+# 1942: Jan 11 02:00 to Oct 18 02:00 [113646], [115726]
+# 1943: Mar 21 02:00 to Oct 31 02:00 [116704], [118193]
+# 1944: Mar 12 02:00 to Nov 5 02:00 [119225], [121593]
+# 1945: Mar 11 02:00 to Nov 4 02:00 [122369], [124461]
+# RG, 1942-01-08, p 2, 1942-10-12, p 2 , 1943-03-06, p 2, 1943-09-03, p 1,
+# 1944-02-29, p 6, 1944-09-20, p 2, 1945-02-13, p 2, 1945-11-03, p 1
+#
+# In 1946, the House of Assembly rejected DST twice. [128686], [128076]
+# RG, 1946-03-16 p 1,1946-04-13 p 1
+#
+# 1947: third Sunday in May 02:00 to second Sunday in September 02:00
+# DST in 1947 was defined in the Daylight Saving Act, 1947 (1947: No. 12)
+# which expired at the end of the year. [125784] ,[132405], [144454], [138226]
+# RG, 1947-02-27, p 1, 1947-05-15, p 1, 1947-09-13, p 1, 1947-12-30, p 1
+#
+# 1948-1952: fourth Sunday in May 02:00 to first Sunday in September 02:00
+# DST in 1948 was defined in the Daylight Saving Act, 1948 (1948 : No. 12)
+# which was set to expired at the end of the year but it was extended until
+# the end of 1952 and was not further extended.
+# [129802], [139403], [146008], [135240], [144330], [139049], [143309],
+# [148271], [149773], [153589], [153802], [155924]
+# RG, 1948-04-13, p 1, 1948-05-22, p 1, 1948-09-04, p 1, 1949-05-21, p1,
+# 1949-09-03, p 1, 1950-05-27 p 1, 1950-09-02, p 1, 1951-05-27, p 1,
+# 1951-09-01, p 1, 1952-05-23, p 1, 1952-09-26, p 1, 1952-12-21, p 8
+#
+# In 1953-1955, the House of Assembly rejected DST each year. [158996],
+# [162620], [166720] RG, 1953-05-02, p 1, 1954-04-01 p 1, 1955-03-12, p 1
+#
+# 1956: fourth Sunday in May 02:00 to last Sunday in October 02:00
+# Time Zone (Seasonal Variation) Act, 1956 (1956: No.44) [1956-05-25]
+# Bermuda Public Acts 1956, p 331-332
+# https://books.google.com/books?id=Xs1AlmD_cEwC&pg=PA63
+#
+# The extension of the Act was rejected by the House of Assembly. [176218]
+# RG, 1956-12-13, p 1
+#
+# From the Chronological Table of Public and Private Acts up to 1985, it seems
+# that there does not exist other Acts related to DST before 1973.
+# https://books.google.com/books?id=r9hMAQAAIAAJ&pg=RA23-PA1
+# Public Acts of the Legislature of the Islands of Bermuda, Together with
+# Statutory Instruments in Force Thereunder, Vol VII
# From Dan Jones, reporting in The Royal Gazette (2006-06-26):
-
# Next year, however, clocks in the US will go forward on the second Sunday
# in March, until the first Sunday in November. And, after the Time Zone
# (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
# Friday, the same thing will happen in Bermuda.
# http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
+# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
+Rule Bermuda 1917 only - Apr 5 24:00 1:00 -
+Rule Bermuda 1917 only - Sep 30 24:00 0 -
+Rule Bermuda 1918 only - Apr 13 24:00 1:00 -
+Rule Bermuda 1918 only - Sep 15 24:00 0 S
+Rule Bermuda 1942 only - Jan 11 2:00 1:00 D
+Rule Bermuda 1942 only - Oct 18 2:00 0 S
+Rule Bermuda 1943 only - Mar 21 2:00 1:00 D
+Rule Bermuda 1943 only - Oct 31 2:00 0 S
+Rule Bermuda 1944 1945 - Mar Sun>=8 2:00 1:00 D
+Rule Bermuda 1944 1945 - Nov Sun>=1 2:00 0 S
+Rule Bermuda 1947 only - May Sun>=15 2:00 1:00 D
+Rule Bermuda 1947 only - Sep Sun>=8 2:00 0 S
+Rule Bermuda 1948 1952 - May Sun>=22 2:00 1:00 D
+Rule Bermuda 1948 1952 - Sep Sun>=1 2:00 0 S
+Rule Bermuda 1956 only - May Sun>=22 2:00 1:00 D
+Rule Bermuda 1956 only - Oct lastSun 2:00 0 S
+
# Zone NAME STDOFF RULES FORMAT [UNTIL]
-Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton
- -4:00 - AST 1974 Apr 28 2:00
+Zone Atlantic/Bermuda -4:19:18 - LMT 1890 # Hamilton
+ -4:19:18 Bermuda BMT/BST 1930 Jan 1 2:00
+ -4:00 Bermuda A%sT 1974 Apr 28 2:00
-4:00 Canada A%sT 1976
-4:00 US A%sT
diff --git a/theory.html b/theory.html
index 4613799..28f6b8e 100644
--- a/theory.html
+++ b/theory.html
@@ -474,8 +474,8 @@ in decreasing order of importance:
<p>
<small>These abbreviations are:
AMT Amsterdam, Asunción, Athens;
- BMT Baghdad, Bangkok, Batavia, Bern, Bogotá, Bridgetown, Brussels,
- Bucharest;
+ BMT Baghdad, Bangkok, Batavia, Bermuda, Bern, Bogotá, Bridgetown,
+ Brussels, Bucharest;
CMT Calamarca, Caracas, Chisinau, Colón, Copenhagen, Córdoba;
DMT Dublin/Dunsink;
EMT Easter;
@@ -506,6 +506,7 @@ in decreasing order of importance:
<small>A few abbreviations also follow the pattern that
<abbr>GMT</abbr>/<abbr>BST</abbr> established for time in the UK.
They are:
+ BMT/BST for Bermuda 1890&ndash;1930,
CMT/BST for Calamarca Mean Time and Bolivian Summer Time
1890&ndash;1932,
DMT/IST for Dublin/Dunsink Mean Time and Irish Summer Time
--
1.8.3.1
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