Thanks for those citations; I installed the attached proposed patch.
From 37b1187b87b4ae9059ae0583badb44716464c8e0 Mon Sep 17 00:00:00 2001
From: Paul Eggert <[email protected]>
Date: Sun, 3 Aug 2025 23:22:19 -0700
Subject: [PROPOSED] =?UTF-8?q?Improve=20=E2=80=9CStandard=20Time=20Through?=
=?UTF-8?q?out=20the=20World=E2=80=9D=20cites?=
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(Thanks to Rob van Gent.)
---
australasia | 4 +++-
northamerica | 10 ++++++++++
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/australasia b/australasia
index 40594453..5cf8f117 100644
--- a/australasia
+++ b/australasia
@@ -1988,6 +1988,7 @@ Zone Pacific/Efate 11:13:16 - LMT 1912 Jan 13 # Vila
# From Paul Eggert (2018-11-19):
# The 1921-01-15 introduction of standard time is in Shanks; it is also in
# "Standard Time Throughout the World", US National Bureau of Standards (1935),
+# https://nvlpubs.nist.gov/nistpubs/Legacy/circ/nbscircular406.pdf
# page 3, which does not give the UT offset. In response to a comment by
# Phake Nick I set the Nauru time of occupation by Japan to
# 1942-08-29/1945-09-08 by using dates from:
@@ -2055,9 +2056,10 @@ Zone Pacific/Efate 11:13:16 - LMT 1912 Jan 13 # Vila
# https://webspace.science.uu.nl/~gent0113/idl/idl_alaska_samoa.htm
# Although Shanks & Pottenger says they both switched to UT -11:30
-# in 1911, and to -11 in 1950. many earlier sources give -11
+# in 1911, and to -11 in 1950, many earlier sources give -11
# for American Samoa, e.g., the US National Bureau of Standards
# circular "Standard Time Throughout the World", 1932.
+# https://nvlpubs.nist.gov/nistpubs/Legacy/circ/nbscircular399.pdf
# Assume American Samoa switched to -11 in 1911, not 1950,
# and that after 1950 they agreed until (western) Samoa skipped a
# day in 2011. Assume also that the Samoas follow the US and New
diff --git a/northamerica b/northamerica
index 20b47b48..e72e6d09 100644
--- a/northamerica
+++ b/northamerica
@@ -1218,6 +1218,16 @@ Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
# _Los Angeles Times_ (1998-11-10), A1, A10; it cites
# Jimmy Skaggs, _The Great Guano Rush_ (1994).
+# From Rob van Gent (2025-07-23):
+# Another useful source for historical time zone information appears to be
+# a series of circulars with the title "Standard Time Throughout the World"
+# issued between 1925 and 1950 by the U.S. Bureau of Standards.
+# I found the following issues online:
+# https://nvlpubs.nist.gov/nistpubs/Legacy/circ/nbscircular280.pdf (1925)
+# https://nvlpubs.nist.gov/nistpubs/Legacy/circ/nbscircular399.pdf (1932)
+# https://nvlpubs.nist.gov/nistpubs/Legacy/circ/nbscircular406.pdf (1935)
+# https://nvlpubs.nist.gov/nistpubs/Legacy/circ/nbscircular496.pdf (1950)
+
################################################################################
--
2.48.1
