From 666022ef2a65bb9872ffa6d98cb73236c5f6daa0 Mon Sep 17 00:00:00 2001 From: Tim Parenti Date: Tue, 2 Mar 2021 22:39:58 -0500 Subject: Tonga moved from +12:20 to +13 in 1961, not 1941 * NEWS: Mention this. * australasia (Pacific/Tongatapu): Update date of transition per contemporaneous editions of The Air Almanac, and compare it with conflicting sources. --- NEWS | 3 ++- australasia | 19 +++++++++++++++---- 2 files changed, 17 insertions(+), 5 deletions(-) diff --git a/NEWS b/NEWS index 6b90005..9e5a399 100644 --- a/NEWS +++ b/NEWS @@ -5,13 +5,14 @@ Unreleased, experimental changes Changes to past timestamps Correct many pre-1993 transitions, fixing entries originally - derived from Shanks and from Whitman. The fixes include: + derived from Shanks, Whitman, and Mundell. The fixes include: - Barbados: standard time was introduced in 1911, not 1932; and DST was observed in 1942-1944 - Guyana: corrected LMT for Georgetown; the introduction of standard time in 1911, not 1915; and corrections to 1975 and 1992 transitions - Portugal: DST was observed in 1950 + - Tonga: moved from +12:20 to +13 in 1961, not 1941 Additional fixes to entries in the 'backzone' file include: - Gambia: 1933 and 1942 transitions - Malawi: several 1911 through 1925 transitions diff --git a/australasia b/australasia index cf8a063..9ba1040 100644 --- a/australasia +++ b/australasia @@ -796,7 +796,7 @@ Rule Tonga 2016 only - Nov Sun>=1 2:00 1:00 - Rule Tonga 2017 only - Jan Sun>=15 3:00 0 - # Zone NAME STDOFF RULES FORMAT [UNTIL] Zone Pacific/Tongatapu 12:19:20 - LMT 1901 - 12:20 - +1220 1941 + 12:20 - +1220 1961 13:00 - +13 1999 13:00 Tonga +13/+14 @@ -2049,9 +2049,20 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # The Crown Prince, presented an unanswerable argument: "Remember that # on the World Day of Prayer, you would be the first people on Earth # to say your prayers in the morning." - -# From Paul Eggert (2006-03-22): -# Shanks & Pottenger say the transition was on 1968-10-01; go with Mundell. +# +# From Tim Parenti (2021-03-02), per Paul Eggert (2006-03-22): +# Mundell places the transition from +12:20 to +13 in 1941, while Shanks & +# Pottenger say the transition was on 1968-10-01. +# +# The Air Almanac published contemporaneous tables of standard times, +# which listed +12:20 as of Nov 1960 and +13 as of Mar 1961: +# Nov 1960: https://books.google.com/books?id=bVgtWM6kPZUC&pg=SL1-PA19 +# Mar 1961: https://books.google.com/books?id=W2nItAul4g0C&pg=SL1-PA19 +# (Thanks to P Chan for pointing us toward these sources.) +# Without greater specificity, presume that this points to a 1961-01-01 +# transition, as Tāufaʻāhau Tupou IV was still Crown Prince in 1961 and this +# still jives with the gist of Mundell's telling, and go with this over Shanks +# & Pottenger. # From Eric Ulevik (1999-05-03): # Tonga's director of tourism, who is also secretary of the National Millennium -- 2.15.1