From ed2f9d6b01d1256a4d463d2ceb953e15e1673d72 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Mon, 8 Feb 2021 15:54:26 -0800
Subject: [PATCH] Portugal observed DST in 1950

(Thanks to Alois Triendl.)
* NEWS: Mention this.
* europe (Port): Remove 1950 exception.
* tz-link.html: Link to OAL.
---
 NEWS         | 7 +++++++
 europe       | 8 +++-----
 tz-link.html | 4 ++++
 3 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/NEWS b/NEWS
index a60847b..b9d5777 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,12 @@
 News for the tz database
 
+Unreleased, experimental changes
+
+  Changes to past timestamps
+
+    Portugal observed DST in 1950.  (Thanks to Alois Treindl.)
+
+
 Release 2021a - 2021-01-24 10:54:57 -0800
 
   Changes to future timestamps
diff --git a/europe b/europe
index bba4d56..1ba175f 100644
--- a/europe
+++ b/europe
@@ -2376,12 +2376,10 @@ Rule	Port	1943	1945	-	Aug	Sat>=25	22:00s	1:00	S
 Rule	Port	1944	1945	-	Apr	Sat>=21	22:00s	2:00	M
 Rule	Port	1946	only	-	Apr	Sat>=1	23:00s	1:00	S
 Rule	Port	1946	only	-	Oct	Sat>=1	23:00s	0	-
-Rule	Port	1947	1949	-	Apr	Sun>=1	 2:00s	1:00	S
-Rule	Port	1947	1949	-	Oct	Sun>=1	 2:00s	0	-
-# Shanks & Pottenger say DST was observed in 1950; go with Whitman.
+# Whitman says DST was not observed in 1950; go with Shanks & Pottenger.
 # Whitman gives Oct lastSun for 1952 on; go with Shanks & Pottenger.
-Rule	Port	1951	1965	-	Apr	Sun>=1	 2:00s	1:00	S
-Rule	Port	1951	1965	-	Oct	Sun>=1	 2:00s	0	-
+Rule	Port	1947	1965	-	Apr	Sun>=1	 2:00s	1:00	S
+Rule	Port	1947	1965	-	Oct	Sun>=1	 2:00s	0	-
 Rule	Port	1977	only	-	Mar	27	 0:00s	1:00	S
 Rule	Port	1977	only	-	Sep	25	 0:00s	0	-
 Rule	Port	1978	1979	-	Apr	Sun>=1	 0:00s	1:00	S
diff --git a/tz-link.html b/tz-link.html
index abe38d8..2bde3df 100644
--- a/tz-link.html
+++ b/tz-link.html
@@ -889,6 +889,10 @@ covers the history of local time in the Netherlands from ancient times.</dd>
 <dd>The Department of Internal Affairs maintains a brief <a
 href="https://www.dia.govt.nz/Daylight-Saving-History">History of
 Daylight Saving</a>.</dd>
+<dt>Portugal</dt>
+<dd>The Lisbon Astronomical Observatory publishes a
+<a href="https://oal.ul.pt/hora-legal/" hreflang="pt">history of
+legal time (in Portuguese)</a>.</dd>
 <dt>Singapore</dt>
 <dd><a id="Singapore"
 href="https://web.archive.org/web/20190822231045/http://www.math.nus.edu.sg/~mathelmr/teaching/timezone.html">Why
-- 
2.27.0

