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From d582a6e3b650d3f66ac43968696ee94b53166f1a Mon Sep 17 00:00:00 2001
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From: Paul Eggert <eggert@cs.ucla.edu>
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Date: Thu, 2 Mar 2017 01:30:19 -0800
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Subject: [PROPOSED] Fix Liberia 1972 transition and pre-1972 abbr
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* NEWS: Document this.
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* africa (Africa/Monrovia): The 1972 transition was on January 7,
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not May 1. (Shanks was wrong again! and Howse was right.)
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Use MMT for pre-1972 abbreviation.
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---
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NEWS | 10 ++++++++++
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africa | 25 ++++++++++++++++---------
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2 files changed, 26 insertions(+), 9 deletions(-)
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diff --git a/NEWS b/NEWS
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index 306685a..b3917d0 100644
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--- a/NEWS
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+++ b/NEWS
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@@ -1,5 +1,15 @@
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News for the tz database
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+Unreleased, experimental changes
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+
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+ Changes to past time stamps
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+
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+ Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
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+
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+ Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
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+ is one byte over the POSIX limit. (Problem reported by Derick Rethans.)
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+
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+
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Release 2017a - 2017-02-28 00:05:36 -0800
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Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
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diff --git a/africa b/africa
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index e617396..dcc20b9 100644
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--- a/africa
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+++ b/africa
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@@ -420,18 +420,25 @@ Link Africa/Nairobi Indian/Mayotte
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# See Africa/Johannesburg.
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# Liberia
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-# From Paul Eggert (2006-03-22):
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-# In 1972 Liberia was the last country to switch
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-# from a UTC offset that was not a multiple of 15 or 20 minutes.
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-# Howse reports that it was in honor of their president's birthday.
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-# Shank & Pottenger report the date as May 1, whereas Howse reports Jan;
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-# go with Shanks & Pottenger.
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-# For Liberia before 1972, Shanks & Pottenger report -0:44, whereas Howse and
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-# Whitman each report -0:44:30; go with the more precise figure.
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+#
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+# From Paul Eggert (2017-03-02):
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+#
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+# The Nautical Almanac for the Year 1970, p 264, is the source for -0:44:30.
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+#
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+# In 1972 Liberia was the last country to switch from a UTC offset
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+# that was not a multiple of 15 or 20 minutes. The 1972 change was on
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+# 1972-01-07, according to an entry dated 1972-01-04 on p 330 of:
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+# Presidential Papers: First year of the administration of
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+# President William R. Tolbert, Jr., July 23, 1971-July 31, 1972.
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+# Monrovia: Executive Mansion.
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+#
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+# Use the abbreviation "MMT" before 1972, as the more-accurate numeric
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+# abbreviation "-004430" would be one byte over the POSIX limit.
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+#
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# Zone NAME GMTOFF RULES FORMAT [UNTIL]
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Zone Africa/Monrovia -0:43:08 - LMT 1882
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-0:43:08 - MMT 1919 Mar # Monrovia Mean Time
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- -0:44:30 - -004430 1972 May
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+ -0:44:30 - MMT 1972 Jan 7 # approximately MMT
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0:00 - GMT
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###############################################################################
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--
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2.7.4
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