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.
--
2.15.1