From bdb47c5fd68996c04a69d6b23c4c4a5a81df5c95 Mon Sep 17 00:00:00 2001 From: Tim Parenti Date: Sat, 20 Feb 2021 20:40:08 -0500 Subject: Backzone fixes for Gambia, Malawi, Sierra Leone (Thanks to P Chan.) * NEWS: Mention these. * backzone (Africa/Banjul, Africa/Blantyre, Africa/Freetown, SL): Adjust several historical transitions to better match legal ordinances. * theory.html (Time zone abbreviations): Add ZMT for Zomba Mean Time in Malawi. --- NEWS | 4 ++++ backzone | 62 +++++++++++++++++++++++++++++++++++++++++++++++++------------ theory.html | 3 ++- 3 files changed, 56 insertions(+), 13 deletions(-) diff --git a/NEWS b/NEWS index 5bad174..b63d426 100644 --- a/NEWS +++ b/NEWS @@ -12,6 +12,10 @@ Unreleased, experimental changes standard time in 1911, not 1915; and corrections to 1975 and 1992 transitions - Portugal: DST was observed in 1950 + Additional fixes to entries in the 'backzone' file include: + - Gambia: 1933 and 1942 transitions + - Malawi: several 1911 through 1925 transitions + - Sierra Leone: several 1913 through 1941 transitions (Thanks to Alois Treindl and P Chan.) Changes to code diff --git a/backzone b/backzone index 3ce7277..acaca55 100644 --- a/backzone +++ b/backzone @@ -102,13 +102,35 @@ Zone Africa/Bangui 1:14:20 - LMT 1912 1:00 - WAT # Gambia +# From P Chan (2020-12-09): +# Standard time of GMT-1 was adopted on 1933-04-01. On 1942-02-01, GMT was +# adopted as a war time measure. This was made permanent in 1946. +# +# Interpretation Ordinance, 1914 (No. 12 of 1914) [1914-09-29] +# Interpretation Ordinance, 1933 (No. 10 of 1933) [1933-03-31] +# Notice No. 5 of 1942, Colony of the Gambia Government Gazette, Vol. LIX, +# No.2, 1942-01-15, p 2 +# Interpretation (Amendment) Ordinance, 1946 (No. 3 of 1946) [1946-07-15] Zone Africa/Banjul -1:06:36 - LMT 1912 - -1:06:36 - BMT 1935 # Banjul Mean Time - -1:00 - -01 1964 + -1:06:36 - BMT 1933 Apr 1 # Banjul Mean Time + -1:00 - -01 1942 Feb 1 0:00 0:00 - GMT # Malawi -Zone Africa/Blantyre 2:20:00 - LMT 1903 Mar +# From P Chan (2020-12-09): +# In 1911, Zomba mean time was adopted as the legal time of Nyasaland. In +# 1914, Zomba mean time switched from GMT+2:21:10 to GMT+2:21. On 1925-07-01, +# GMT+2 was adopted. +# +# Interpretation and General Clauses Ordinance, 1911 (No. 12 of 1911) +# [1911-07-24] +# Notice No. 124 of 1914, 1914-06-30, The Nyasaland Government Gazette, Vol. +# XXI, No. 8, 1914-06-30, p 122 +# Interpretation and General Clauses (Amendment) Ordinance, 1925 (No. 3 of +# 1925) [1925-04-02] +Zone Africa/Blantyre 2:20:00 - LMT 1911 Jul 24 + 2:21:10 - ZMT 1914 Jun 30 # Zomba Mean Time + 2:21 - ZMT 1925 Jul 1 2:00 - CAT # Republic of the Congo @@ -145,19 +167,35 @@ Zone Africa/Djibouti 2:52:36 - LMT 1911 Jul Zone Africa/Douala 0:38:48 - LMT 1912 1:00 - WAT # Sierra Leone -# From Paul Eggert (2014-08-12): -# The following table is from Shanks & Pottenger, but it can't be right. -# Whitman gives Mar 31 - Aug 31 for 1931 on. -# The International Hydrographic Bulletin, 1932-33, p 63 says that -# Sierra Leone would advance its clocks by 20 minutes on 1933-10-01. +# From P Chan (2020-12-09): +# Standard time of GMT-1 was adopted on 1913-07-01. Twenty minutes of DST was +# introduce[d] in 1932 and was suspended in 1939. In 1941, GMT was adopted by +# Defence Regulations. This was made permanent in 1946. +# +# Government Notice No. 121 of 1913, 1913-06-06, Sierra Leone Royal Gazette, +# Vol. XLIV, No. 1384, 1913-06-14, p 347 +# Alteration of Time Ordinance, 1932 (No. 34 of 1932) [1932-12-01] +# Alteration of Time (Amendment) Ordinance, 1938 (No. 25 of 1938) [1938-11-24] +# Defence Regulations (No. 9), 1939 (Regulations No. 9 of 1939), 1939-09-05 +# Defence Regulations (No. 11), 1939 (Regulations No. 11 of 1939), 1939-09-27 +# Defence (Amendment) (No. 17) Regulations, 1941 (Public Notice No. 157 of +# 1941), 1914-12-04 +# Alteration of Time (Amendment) Ordinance, 1946 (No. 2 of 1946) [1946-02-07] + +# From Tim Parenti (2021-02-20), per Paul Eggert (2014-08-12): +# We retain the 1957 through 1962 transitions from Shanks & Pottenger since we +# have no better data there. # Rule NAME FROM TO - IN ON AT SAVE LETTER/S -Rule SL 1935 1942 - Jun 1 0:00 0:40 -0020 -Rule SL 1935 1942 - Oct 1 0:00 0 -01 +Rule SL 1932 only - Dec 1 0:00 0:20 -0040 +Rule SL 1933 1938 - Mar 31 24:00 0 -01 +Rule SL 1933 1939 - Aug 31 24:00 0:20 -0040 +Rule SL 1939 only - May 31 24:00 0 -01 Rule SL 1957 1962 - Jun 1 0:00 1:00 +01 Rule SL 1957 1962 - Sep 1 0:00 0 GMT Zone Africa/Freetown -0:53:00 - LMT 1882 - -0:53:00 - FMT 1913 Jun # Freetown Mean Time - -1:00 SL %s 1957 + -0:53:00 - FMT 1913 Jul 1 # Freetown MT + -1:00 SL %s 1939 Sep 5 + -1:00 - -01 1941 Dec 6 24:00 0:00 SL GMT/+01 # Botswana diff --git a/theory.html b/theory.html index 28f6b8e..163e38f 100644 --- a/theory.html +++ b/theory.html @@ -499,7 +499,8 @@ in decreasing order of importance: SMT Santiago, Simferopol, Singapore, Stanley; TBMT Tbilisi; TMT Tallinn, Tehran; - WMT Warsaw. + WMT Warsaw; + ZMT Zomba.

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