[tz] probable correction to Europe/Kaliningrad 1945

[Paul Eggert]

Thanks for these corrections. I noticed also that the date for the transition 
from EET (+02/+03) to MSK (+03) did not match Shanks as intended. I installed 
the attached proposed patch.
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From f1d4fd78cbbd8bccec374c3e96e9b4ac37e0a83e Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Thu, 25 Jul 2019 02:02:21 -0700
Subject: [PROPOSED] Fixes for Kalingrad in 1945/6

(Thanks to Alois Triendl.)
* NEWS: Mention this.
* europe (Europe/Kaliningrad): Fix transitions in 1945/6.
---
 NEWS   |  5 ++++-
 europe | 10 ++++++++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/NEWS b/NEWS
index 8120ec5..2337904 100644
--- a/NEWS
+++ b/NEWS
@@ -14,7 +14,10 @@ Unreleased, experimental changes
 
     Edmonton did not observe DST in 1967 or 1969.  In 1946 Vancouver
     ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not
-    10-06.  (Thanks to Alois Triendl.)
+    10-06.  In 1945 Königsberg (now Kaliningrad) switched from +01/+02
+    to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated
+    EET/EEST, not CET/CEST.  (Thanks to Alois Triendl.)  In 1946
+    Königsberg switched to +03 on 04-07 not 01-01.
 
   Changes to past time zone abbreviations and DST flags
 
diff --git a/europe b/europe
index 9b819a0..ec6f112 100644
--- a/europe
+++ b/europe
@@ -2497,6 +2497,12 @@ Zone Europe/Bucharest	1:44:24 -	LMT	1891 Oct
 # Europe/Kaliningrad covers...
 # 39	RU-KGD	Kaliningrad Oblast
 
+# From Paul Eggert (2019-07-25):
+# Although Shanks lists 1945-01-01 as the date for transition from
+# +01/+02 to +02/+03, more likely this is a placeholder.  Guess that
+# the transition occurred at 1945-04-10 00:00, which is about when
+# Königsberg surrendered to Soviet troops.  (Thanks to Alois Triendl.)
+
 # From Paul Eggert (2016-03-18):
 # The 1989 transition is from USSR act No. 227 (1989-03-14).
 
@@ -2513,8 +2519,8 @@ Zone Europe/Bucharest	1:44:24 -	LMT	1891 Oct
 # Moscow on 1991-11-03, switched to Moscow-1 on 1992-01-19.
 
 Zone Europe/Kaliningrad	 1:22:00 -	LMT	1893 Apr
-			 1:00	C-Eur	CE%sT	1945
-			 2:00	Poland	CE%sT	1946
+			 1:00	C-Eur	CE%sT	1945 Apr 10
+			 2:00	Poland	EE%sT	1946 Apr  7
 			 3:00	Russia	MSK/MSD	1989 Mar 26  2:00s
 			 2:00	Russia	EE%sT	2011 Mar 27  2:00s
 			 3:00	-	+03	2014 Oct 26  2:00s
-- 
2.17.1