[tz] Wrong Cuba date in 2004

[Paul Eggert]

Thanks for the heads-up.
I've pushed this patch to the experimental repository:

>From f0b7563dc269b34593a1667845530f525a731e8b Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Wed, 13 Nov 2013 01:00:16 -0800
Subject: [PATCH] America/Havana: fix spring 2004 transition

* northamerica (Cuba), NEWS: In 2004, Cuba began DST on March 28,
not April 4.  (Thanks to Steffen Thorsen.)
---
 NEWS         | 5 +++++
 northamerica | 8 +++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/NEWS b/NEWS
index 246abcd..0734458 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,11 @@ News for the tz database
 
 Unreleased, experimental changes
 
+  Changes affecting past time stamps:
+
+    In 2004, Cuba began DST on March 28, not April 4.
+    (Thanks to Steffen Thorsen.)
+
   Changes affecting code
 
     The compile-time flag NOSOLAR has been removed, as nowadays the
diff --git a/northamerica b/northamerica
index c3921d3..83c521b 100644
--- a/northamerica
+++ b/northamerica
@@ -2665,6 +2665,11 @@ Zone America/Costa_Rica	-5:36:13 -	LMT	1890		# San Jose
 # to DST--and one more hour on 1999-04-04--when the announcers will have
 # returned to Baltimore, which switches on that date.)
 
+# From Steffen Thorsen (2013-11-11):
+# DST start in Cuba in 2004 ... does not follow the same rules as the
+# years before.  The correct date should be Sunday 2004-03-28 00:00 ...
+# https://web.archive.org/web/20040402060750/http://www.granma.cu/espanol/2004/marzo/sab27/reloj.html
+
 # From Evert van der Veer via Steffen Thorsen (2004-10-28):
 # Cuba is not going back to standard time this year.
 # From Paul Eggert (2006-03-22):
@@ -2854,7 +2859,8 @@ Rule	Cuba	1996	only	-	Oct	 6	0:00s	0	S
 Rule	Cuba	1997	only	-	Oct	12	0:00s	0	S
 Rule	Cuba	1998	1999	-	Mar	lastSun	0:00s	1:00	D
 Rule	Cuba	1998	2003	-	Oct	lastSun	0:00s	0	S
-Rule	Cuba	2000	2004	-	Apr	Sun>=1	0:00s	1:00	D
+Rule	Cuba	2000	2003	-	Apr	Sun>=1	0:00s	1:00	D
+Rule	Cuba	2004	only	-	Mar	lastSun	0:00s	1:00	D
 Rule	Cuba	2006	2010	-	Oct	lastSun	0:00s	0	S
 Rule	Cuba	2007	only	-	Mar	Sun>=8	0:00s	1:00	D
 Rule	Cuba	2008	only	-	Mar	Sun>=15	0:00s	1:00	D
-- 
1.8.3.1