From 17acee8cbb75aaf7bca5decc4fc6c9ab27533537 Mon Sep 17 00:00:00 2001 From: Paul Eggert 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:

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: A few abbreviations also follow the pattern that GMT/BST established for time in the UK. They are: + BMT/BST for Bermuda 1890–1930, CMT/BST for Calamarca Mean Time and Bolivian Summer Time 1890–1932, DMT/IST for Dublin/Dunsink Mean Time and Irish Summer Time -- 1.8.3.1