[tz] America/Vancouver for 1946, PS

[Paul Eggert]

Thanks for tracking down those sources about Vancouver. I installed the attached 
proposed patch. It seems that we may also be missing data for Vancouver 
transitions in 1941 and 1922, so that patch also has some commentary about that.
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From 7cdb59b8191808d0c302f4e4e16d850c2d5f0365 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Thu, 25 Jul 2019 00:31:06 -0700
Subject: [PROPOSED] =?UTF-8?q?Fix=20Vancouver=E2=80=99s=201946=20DST=20end?=
 =?UTF-8?q?=20date?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

(Thanks to Alois Triendl.)
* NEWS: Mention this.
* northamerica (Vanc): End DST on 09-29, not 10-13.
Also, add some commentary about 1922 and 1941.
---
 NEWS         |  3 +++
 northamerica | 16 ++++++++++++++--
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/NEWS b/NEWS
index e2ebe32..58f064a 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,9 @@ Unreleased, experimental changes
     Fix several errors in pre-1970 transitions in Perry County, IN.
     (Thanks to Alois Triendl for pointing out the 1967/9 errors.)
 
+    In 1946 Vancouver ended DST on 09-29, not 10-13.  (Thanks to
+    Alois Triendl.)
+
   Changes to past time zone abbreviations and DST flags
 
     Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25,
diff --git a/northamerica b/northamerica
index b9437a7..3d6f85f 100644
--- a/northamerica
+++ b/northamerica
@@ -2065,8 +2065,20 @@ Zone America/Edmonton	-7:33:52 -	LMT	1906 Sep
 # been on MST (-0700) like Dawson Creek since it advanced its clocks on
 # 2015-03-08.
 #
-# From Paul Eggert (2015-09-23):
+# From Paul Eggert (2019-07-25):
 # Shanks says Fort Nelson did not observe DST in 1946, unlike Vancouver.
+# Alois Triendl confirmed this on 07-22, citing the 1946-04-27 Vancouver Daily
+# Province.  He also cited the 1946-09-28 Victoria Daily Times, which said
+# that Vancouver, Victoria, etc. "change at midnight Saturday"; for now,
+# guess they meant 02:00 Sunday since 02:00 was common practice in Vancouver.
+#
+# Early Vancouver, Volume Four, by Major J.S. Matthews, V.D., 2011 edition
+# says that a 1922 plebiscite adopted DST, but a 1923 plebiscite rejected it.
+# http://former.vancouver.ca/ctyclerk/archives/digitized/EarlyVan/SearchEarlyVan/Vol4pdf/MatthewsEarlyVancouverVol4_DaylightSavings.pdf
+# A catalog entry for a newspaper clipping seems to indicate that Vancouver
+# observed DST in 1941 from 07-07 through 09-27; see
+# https://searcharchives.vancouver.ca/daylight-saving-1918-starts-again-july-7-1941-start-d-s-sept-27-end-of-d-s-1941
+# We have no further details, so omit them for now.
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Vanc	1918	only	-	Apr	14	2:00	1:00	D
@@ -2075,7 +2087,7 @@ Rule	Vanc	1942	only	-	Feb	 9	2:00	1:00	W # War
 Rule	Vanc	1945	only	-	Aug	14	23:00u	1:00	P # Peace
 Rule	Vanc	1945	only	-	Sep	30	2:00	0	S
 Rule	Vanc	1946	1986	-	Apr	lastSun	2:00	1:00	D
-Rule	Vanc	1946	only	-	Oct	13	2:00	0	S
+Rule	Vanc	1946	only	-	Sep	29	2:00	0	S
 Rule	Vanc	1947	1961	-	Sep	lastSun	2:00	0	S
 Rule	Vanc	1962	2006	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
-- 
2.17.1