106 lines
4.9 KiB
Diff
106 lines
4.9 KiB
Diff
From 316c1598e166e15c27fe611cacd81aeada2a836d Mon Sep 17 00:00:00 2001
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From: Tim Parenti <tim@timtimeonline.com>
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Date: Thu, 10 Dec 2020 22:39:46 -0500
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Subject: [PATCH] Correct LMT and pre-1919 transitions for Nigeria
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(Thanks to P Chan.)
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* NEWS: Mention this.
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* africa (Africa/Lagos): Move LMT 1 s west; add several pre-1919
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transitions with references.
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---
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NEWS | 2 ++
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africa | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
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2 files changed, 64 insertions(+), 1 deletion(-)
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diff --git a/NEWS b/NEWS
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index 041d224..991b737 100644
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--- a/NEWS
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+++ b/NEWS
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@@ -18,6 +18,8 @@ Unreleased, experimental changes
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- Ghana: several 1915 through 1956 transitions
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- Israel and Palestine: several 1940 through 1985 transitions
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- Kenya and adjacent: several 1908 through 1960 transitions
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+ - Nigeria and adjacent: correcting LMT in Lagos, and several 1905
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+ through 1919 transitions
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- Seychelles: the introduction of standard time in 1907, not 1906
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- Vanuatu: DST in 1973-1974, and a corrected 1984 transition
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(Thanks to P Chan.)
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diff --git a/africa b/africa
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index e0200a9..59cf501 100644
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--- a/africa
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+++ b/africa
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@@ -1318,8 +1318,69 @@ Zone Africa/Windhoek 1:08:24 - LMT 1892 Feb 8
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# See Africa/Lagos.
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# Nigeria
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+
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+# From P Chan (2020-12-03):
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+# GMT was adopted as the standard time of Lagos on 1905-07-01.
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+# Lagos Weekly Record, 1905-06-24, p 3
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+# http://ddsnext.crl.edu/titles/31558#?c=0&m=668&s=0&cv=2&r=0&xywh=1446%2C5221%2C1931%2C1235
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+# says "It is officially notified that on and after the 1st of July 1905
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+# Greenwich Mean Solar Time will be adopted thought the Colony and
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+# Protectorate, and that it will be necessary to put all clocks 13 minutes and
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+# 35 seconds back, recording local mean time."
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+#
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+# It seemed that Lagos returned to LMT on 1908-07-01.
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+# [The Lagos Standard], 1908-07-01, p 5
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+# http://ddsnext.crl.edu/titles/31556#?c=0&m=78&s=0&cv=4&r=0&xywh=-92%2C3590%2C3944%2C2523
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+# says "Scarcely have the people become accustomed to this new time, when
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+# another official notice has now appeared announcing that from and after the
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+# 1st July next, return will be made to local mean time."
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+#
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+# From P Chan (2020-11-27):
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+# On 1914-01-01, standard time of GMT+0:30 was adopted for the unified Nigeria.
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+# Colonial Reports - Annual. No. 878. Nigeria. Report for 1914. (April 1916),
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+# p 27
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+# https://libsysdigi.library.illinois.edu/ilharvest/Africana/Books2011-05/3064634/3064634_1914/3064634_1914_opt.pdf#page=27
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+# "On January 1st [1914], a universal standard time for Nigeria was adopted,
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+# viz., half an hour fast on Greenwich mean time, corresponding to the meridian
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+# 7 [degrees] 30' E. long."
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+# Lloyd's Register of Shipping (1915) says "Hitherto the time observed in Lagos
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+# was the local mean time. On 1st January, 1914, standard time for the whole of
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+# Nigeria was introduced ... Lagos time has been advanced about 16 minutes
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+# accordingly."
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+#
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+# In 1919, standard time was changed to GMT+1.
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+# Interpretation Ordinance (Cap 2)
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+# The Laws of Nigeria, Containing the Ordinances of Nigeria, in Force on the
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+# 1st Day of January, 1923, Vol.I [p 16]
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+# https://books.google.com/books?id=BOMrAQAAMAAJ&pg=PA16
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+# "The expression 'Standard time' means standard time as used in Nigeria:
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+# namely, 60 minutes in advance of Greenwich mean time. (As amended by 18 of
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+# 1919, s. 2.)"
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+# From Tim Parenti (2020-12-10):
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+# The Lagos Weekly Record, 1919-09-20, p 3 details discussion on the first
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+# reading of this Bill by the Legislative Council of the Colony of Nigeria on
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+# Thursday 1919-08-28:
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+# http://ddsnext.crl.edu/titles/31558?terms&item_id=303484#?m=1118&c=1&s=0&cv=2&r=0&xywh=1261%2C3408%2C2994%2C1915
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+# "The proposal is that the Globe should be divided into twelve zones East and
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+# West of Greenwich, of one hour each, Nigeria falling into the zone with a
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+# standard of one hour fast on Greenwich Mean Time. Nigeria standard time is
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+# now 30 minutes in advance of Greenwich Mean Time ... according to the new
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+# proposal, standard time will be advanced another 30 minutes". It was further
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+# proposed that the firing of the time guns likewise be adjusted by 30 minutes
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+# to compensate.
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+# From Tim Parenti (2020-12-10), per P Chan (2020-12-11):
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+# The text of Ordinance 18 of 1919, published in Nigeria Gazette, Vol 6, No 52,
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+# shows that the change was assented to the following day and took effect "on
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+# the 1st day of September, 1919."
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+# Nigeria Gazette and Supplements 1919 Jan-Dec, Reference: 73266B-40,
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+# img 245-246
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+# https://microform.digital/boa/collections/77/volumes/539/nigeria-lagos-1887-1919
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+
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# Zone NAME STDOFF RULES FORMAT [UNTIL]
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-Zone Africa/Lagos 0:13:36 - LMT 1919 Sep
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+Zone Africa/Lagos 0:13:35 - LMT 1905 Jul 1
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+ 0:00 - GMT 1908 Jul 1
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+ 0:13:35 - LMT 1914 Jan 1
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+ 0:30 - +0030 1919 Sep 1
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1:00 - WAT
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Link Africa/Lagos Africa/Bangui # Central African Republic
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Link Africa/Lagos Africa/Brazzaville # Rep. of the Congo
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--
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1.8.3.1
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