[tz] [PROPOSED] Miquelon 1911 transition was June 15 not May 15
Paul Eggert
eggert at cs.ucla.edu
Wed Jan 10 18:23:38 UTC 2024
I found a new source: Société Française de Physique, Recueil de
constantes physiques (1913), page 752 (errata and addenda), 18b.
It agrees with Shanks about the adoption of standard time in
French possessions, except for Miquelon. Prefer it to Shanks.
Also, fill in day of month (e.g., “Jan 1” not “Jan”) for other
transitions, since the source seems careful about the day.
* NEWS: Mention this.
* africa (Africa/Ndjamena, Africa/Abidjan):
* australasia (Pacific/Gambier, Pacific/Marquesas, Pacific/Tahiti)
(Pacific/Guadalcanal):
* northamerica (America/Martinique):
* southamerica (America/Cayenne):
Fill in day of month as 1. This does not change the transitions;
it’s merely documentation.
* northamerica (America/Miquelon): 1911 transition was Jun 15,
not May 15.
---
NEWS | 2 ++
africa | 8 ++++++--
australasia | 12 ++++++++----
northamerica | 8 ++++++--
southamerica | 5 ++++-
5 files changed, 26 insertions(+), 9 deletions(-)
diff --git a/NEWS b/NEWS
index 6dba3dfb..f0ccfa87 100644
--- a/NEWS
+++ b/NEWS
@@ -11,6 +11,8 @@ Unreleased, experimental changes
From 1947 through 1949, Toronto's transitions occurred at 02:00
not 00:00. (Thanks to Chris Walton.)
+ In 1911 Miquelon adopted standard time on June 15, not May 15.
+
Changes to code
The FROM and TO columns of Rule lines can no longer be "minimum"
diff --git a/africa b/africa
index 6fae18c0..92d823a0 100644
--- a/africa
+++ b/africa
@@ -30,6 +30,10 @@
# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
# https://www.jstor.org/stable/1774359
#
+# For the 1911/1912 establishment of standard time in French possessions, see:
+# Société Française de Physique, Recueil de constantes physiques (1913),
+# page 752, 18b.
+#
# European-style abbreviations are commonly used along the Mediterranean.
# For sub-Saharan Africa abbreviations were less standardized.
# Previous editions of this database used WAT, CAT, SAT, and EAT
@@ -113,7 +117,7 @@ Zone Atlantic/Cape_Verde -1:34:04 - LMT 1912 Jan 01 2:00u # Praia
# Chad
# Zone NAME STDOFF RULES FORMAT [UNTIL]
-Zone Africa/Ndjamena 1:00:12 - LMT 1912 # N'Djamena
+Zone Africa/Ndjamena 1:00:12 - LMT 1912 Jan 1 # N'Djamena
1:00 - WAT 1979 Oct 14
1:00 1:00 WAST 1980 Mar 8
1:00 - WAT
@@ -139,7 +143,7 @@ Zone Africa/Ndjamena 1:00:12 - LMT 1912 # N'Djamena
# Inaccessible, Nightingale: uninhabited
# Zone NAME STDOFF RULES FORMAT [UNTIL]
-Zone Africa/Abidjan -0:16:08 - LMT 1912
+Zone Africa/Abidjan -0:16:08 - LMT 1912 Jan 1
0:00 - GMT
###############################################################################
diff --git a/australasia b/australasia
index dc98c1e2..a9e9eb4a 100644
--- a/australasia
+++ b/australasia
@@ -420,11 +420,11 @@ Zone Pacific/Fiji 11:55:44 - LMT 1915 Oct 26 # Suva
# French Polynesia
# Zone NAME STDOFF RULES FORMAT [UNTIL]
-Zone Pacific/Gambier -8:59:48 - LMT 1912 Oct # Rikitea
+Zone Pacific/Gambier -8:59:48 - LMT 1912 Oct 1 # Rikitea
-9:00 - -09
-Zone Pacific/Marquesas -9:18:00 - LMT 1912 Oct
+Zone Pacific/Marquesas -9:18:00 - LMT 1912 Oct 1
-9:30 - -0930
-Zone Pacific/Tahiti -9:58:16 - LMT 1912 Oct # Papeete
+Zone Pacific/Tahiti -9:58:16 - LMT 1912 Oct 1 # Papeete
-10:00 - -10
# Clipperton (near North America) is administered from French Polynesia;
# it is uninhabited.
@@ -802,7 +802,7 @@ Zone Pacific/Apia 12:33:04 - LMT 1892 Jul 5
# Solomon Is
# excludes Bougainville, for which see Papua New Guinea
# Zone NAME STDOFF RULES FORMAT [UNTIL]
-Zone Pacific/Guadalcanal 10:39:48 - LMT 1912 Oct # Honiara
+Zone Pacific/Guadalcanal 10:39:48 - LMT 1912 Oct 1 # Honiara
11:00 - +11
# Tokelau
@@ -963,6 +963,10 @@ Zone Pacific/Efate 11:13:16 - LMT 1912 Jan 13 # Vila
# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
# https://www.jstor.org/stable/1774359
#
+# For the 1911/1912 establishment of standard time in French possessions, see:
+# Société Française de Physique, Recueil de constantes physiques (1913),
+# page 752, 18b.
+#
# A reliable and entertaining source about time zones is
# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
#
diff --git a/northamerica b/northamerica
index 44fd50bd..0163d17a 100644
--- a/northamerica
+++ b/northamerica
@@ -1268,6 +1268,10 @@ Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
# <http://cs.ucla.edu/~eggert/The-Waste-of-Daylight-19th.pdf>
# [PDF] (1914-03)
#
+# For the 1911/1912 establishment of standard time in French possessions, see:
+# Société Française de Physique, Recueil de constantes physiques (1913),
+# page 752, 18b.
+#
# See the 'europe' file for Greenland.
# Canada
@@ -3437,7 +3441,7 @@ Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston
# Martinique
# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone America/Martinique -4:04:20 - LMT 1890 # Fort-de-France
- -4:04:20 - FFMT 1911 May # Fort-de-France MT
+ -4:04:20 - FFMT 1911 May 1 # Fort-de-France MT
-4:00 - AST 1980 Apr 6
-4:00 1:00 ADT 1980 Sep 28
-4:00 - AST
@@ -3544,7 +3548,7 @@ Zone America/Puerto_Rico -4:24:25 - LMT 1899 Mar 28 12:00 # San Juan
# St Pierre and Miquelon
# There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
-Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
+Zone America/Miquelon -3:44:40 - LMT 1911 Jun 15 # St Pierre
-4:00 - AST 1980 May
-3:00 - -03 1987
-3:00 Canada -03/-02
diff --git a/southamerica b/southamerica
index 19c7e456..344e67f3 100644
--- a/southamerica
+++ b/southamerica
@@ -1570,8 +1570,11 @@ Zone Atlantic/Stanley -3:51:24 - LMT 1890
-3:00 - -03
# French Guiana
+# For the 1911/1912 establishment of standard time in French possessions, see:
+# Société Française de Physique, Recueil de constantes physiques (1913),
+# page 752, 18b.
# Zone NAME STDOFF RULES FORMAT [UNTIL]
-Zone America/Cayenne -3:29:20 - LMT 1911 Jul
+Zone America/Cayenne -3:29:20 - LMT 1911 Jul 1
-4:00 - -04 1967 Oct
-3:00 - -03
--
2.40.1
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