Update timezone code to track the upstream changes since 2003. In particular

this adds support for 64-bit tzdata files, which is needed to support DST
calculations beyond 2038.  Add a regression test case to give some minimal
confidence that that really works.

Heikki Linnakangas

Author: tglsfdc

src/test/regress/expected/timestamptz.out

@@ -114,6 +114,31 @@ INSERT INTO TIMESTAMPTZ_TBL VALUES ('19970710 173201 America/Does_not_exist');
 ERROR:  time zone "america/does_not_exist" not recognized
 SELECT '19970710 173201' AT TIME ZONE 'America/Does_not_exist';
 ERROR:  time zone "America/Does_not_exist" not recognized
+-- Daylight saving time for timestamps beyond 32-bit time_t range.
+SELECT '20500710 173201 Europe/Helsinki'::timestamptz; -- DST
+         timestamptz          
+------------------------------
+ Sun Jul 10 07:32:01 2050 PDT
+(1 row)
+
+SELECT '20500110 173201 Europe/Helsinki'::timestamptz; -- non-DST
+         timestamptz          
+------------------------------
+ Mon Jan 10 07:32:01 2050 PST
+(1 row)
+
+SELECT '205000-07-10 17:32:01 Europe/Helsinki'::timestamptz; -- DST
+          timestamptz           
+--------------------------------
+ Thu Jul 10 07:32:01 205000 PDT
+(1 row)
+
+SELECT '205000-01-10 17:32:01 Europe/Helsinki'::timestamptz; -- non-DST
+          timestamptz           
+--------------------------------
+ Fri Jan 10 07:32:01 205000 PST
+(1 row)
+
 -- Check date conversion and date arithmetic
 INSERT INTO TIMESTAMPTZ_TBL VALUES ('1997-06-10 18:32:01 PDT');
 INSERT INTO TIMESTAMPTZ_TBL VALUES ('Feb 10 17:32:01 1997');

src/test/regress/sql/timestamptz.sql

@@ -86,6 +86,13 @@ SELECT '19970710 173201' AT TIME ZONE 'America/New_York';
 INSERT INTO TIMESTAMPTZ_TBL VALUES ('19970710 173201 America/Does_not_exist');
 SELECT '19970710 173201' AT TIME ZONE 'America/Does_not_exist';
 
+-- Daylight saving time for timestamps beyond 32-bit time_t range.
+SELECT '20500710 173201 Europe/Helsinki'::timestamptz; -- DST
+SELECT '20500110 173201 Europe/Helsinki'::timestamptz; -- non-DST
+
+SELECT '205000-07-10 17:32:01 Europe/Helsinki'::timestamptz; -- DST
+SELECT '205000-01-10 17:32:01 Europe/Helsinki'::timestamptz; -- non-DST
+
 -- Check date conversion and date arithmetic
 INSERT INTO TIMESTAMPTZ_TBL VALUES ('1997-06-10 18:32:01 PDT');
 

src/timezone/README

@@ -1,10 +1,12 @@
-This is a PostgreSQL adapted version of the timezone library
-from:
+This is a PostgreSQL adapted version of the timezone library from:
 
 	ftp://elsie.nci.nih.gov/pub/tzcode*.tar.gz
 
-The data files under data/ are an exact copy of the latest data set
-from
+The code is currently synced with release 2007k.  There are many cosmetic
+(and not so cosmetic) differences from the original tzcode library, but
+diffs in the upstream version should usually be propagated to our version.
+
+The data files under data/ are an exact copy of the latest data set from:
 
 	ftp://elsie.nci.nih.gov/pub/tzdata*.tar.gz
 

src/timezone/ialloc.c

@@ -1,9 +1,9 @@
 /*
  * This file is in the public domain, so clarified as of
- * 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
+ * 2006-07-17 by Arthur David Olson.
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/timezone/ialloc.c,v 1.9 2007/10/26 13:30:10 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/timezone/ialloc.c,v 1.10 2008/02/16 21:16:04 tgl Exp $
  */
 
 #include "postgres_fe.h"