commit 205813da4c264d80db3c3215db199cc119e18369
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date:   Sat Sep 14 17:55:03 2024 -0400

    Run regression tests with timezone America/Los_Angeles.
    
    Historically we've used timezone "PST8PDT", but the recent release
    2024b of tzdb changes the definition of that zone in a way that
    breaks many test cases concerned with dates before 1970.  Although
    we've not yet adopted 2024b into our own tree, this is already
    problematic for people using --with-system-tzdata if their platform
    has already adopted 2024b.  To work with both older and newer
    versions of tzdb, switch to using "America/Los_Angeles", accepting
    the ensuing changes in regression test results.
    
    Back-patch to all supported branches.
    
    Per report and patch from Wolfgang Walther.
    
    Discussion: https://postgr.es/m/0a997455-5aba-4cf2-a354-d26d8bcbfae6@technowledgy.de

--- a/doc/src/sgml/ref/set.sgml
+++ b/doc/src/sgml/ref/set.sgml
@@ -200,7 +200,7 @@ SELECT setseed(<replaceable>value</repla
 
        <variablelist>
         <varlistentry>
-         <term><literal>'PST8PDT'</literal></term>
+         <term><literal>'America/Los_Angeles'</literal></term>
          <listitem>
           <para>
            The time zone for Berkeley, California.
@@ -290,7 +290,7 @@ SET datestyle TO postgres, dmy;
   <para>
    Set the time zone for Berkeley, California:
 <screen>
-SET TIME ZONE 'PST8PDT';
+SET TIME ZONE 'America/Los_Angeles';
 </screen>
   </para>
 
--- a/doc/src/sgml/regress.sgml
+++ b/doc/src/sgml/regress.sgml
@@ -414,11 +414,11 @@ gmake check NO_LOCALE=1
     <para>
      Most of the date and time results are dependent on the time zone
      environment.  The reference files are generated for time zone
-     <literal>PST8PDT</literal> (Berkeley, California), and there will be
+     <literal>America/Los_Angeles</literal>, and there will be
      apparent failures if the tests are not run with that time zone setting.
      The regression test driver sets environment variable
-     <envar>PGTZ</envar> to <literal>PST8PDT</literal>, which normally
-     ensures proper results.
+     <envar>PGTZ</envar> to <literal>America/Los_Angeles</literal>,
+     which normally ensures proper results.
     </para>
    </sect2>
 
--- a/src/test/regress/expected/date.out
+++ b/src/test/regress/expected/date.out
@@ -1106,7 +1106,7 @@ SELECT DATE_TRUNC('MILLENNIUM', TIMESTAM
 SELECT DATE_TRUNC('MILLENNIUM', DATE '1970-03-20'); -- 1001-01-01
           date_trunc          
 ------------------------------
- Thu Jan 01 00:00:00 1001 PST
+ Thu Jan 01 00:00:00 1001 LMT
 (1 row)
 
 SELECT DATE_TRUNC('CENTURY', TIMESTAMP '1970-03-20 04:30:00.00000'); -- 1901
@@ -1130,13 +1130,13 @@ SELECT DATE_TRUNC('CENTURY', DATE '2004-
 SELECT DATE_TRUNC('CENTURY', DATE '0002-02-04'); -- 0001-01-01
           date_trunc          
 ------------------------------
- Mon Jan 01 00:00:00 0001 PST
+ Mon Jan 01 00:00:00 0001 LMT
 (1 row)
 
 SELECT DATE_TRUNC('CENTURY', DATE '0055-08-10 BC'); -- 0100-01-01 BC
            date_trunc            
 ---------------------------------
- Tue Jan 01 00:00:00 0100 PST BC
+ Tue Jan 01 00:00:00 0100 LMT BC
 (1 row)
 
 SELECT DATE_TRUNC('DECADE', DATE '1993-12-25'); -- 1990-01-01
@@ -1148,13 +1148,13 @@ SELECT DATE_TRUNC('DECADE', DATE '1993-1
 SELECT DATE_TRUNC('DECADE', DATE '0004-12-25'); -- 0001-01-01 BC
            date_trunc            
 ---------------------------------
- Sat Jan 01 00:00:00 0001 PST BC
+ Sat Jan 01 00:00:00 0001 LMT BC
 (1 row)
 
 SELECT DATE_TRUNC('DECADE', DATE '0002-12-31 BC'); -- 0011-01-01 BC
            date_trunc            
 ---------------------------------
- Mon Jan 01 00:00:00 0011 PST BC
+ Mon Jan 01 00:00:00 0011 LMT BC
 (1 row)
 
 --
--- a/src/test/regress/expected/horology.out
+++ b/src/test/regress/expected/horology.out
@@ -1,7 +1,18 @@
 --
 -- HOROLOGY
 --
-SET DateStyle = 'Postgres, MDY';
+SHOW TimeZone;  -- Many of these tests depend on the prevailing settings
+      TimeZone       
+---------------------
+ America/Los_Angeles
+(1 row)
+
+SHOW DateStyle;
+   DateStyle   
+---------------
+ Postgres, MDY
+(1 row)
+
 --
 -- Test various input formats
 --
@@ -718,12 +729,12 @@ SELECT '' AS "64", d1 + interval '1 year
     | Sat Feb 14 17:32:01 1998 PST
     | Sun Feb 15 17:32:01 1998 PST
     | Mon Feb 16 17:32:01 1998 PST
-    | Thu Feb 16 17:32:01 0096 PST BC
-    | Sun Feb 16 17:32:01 0098 PST
-    | Fri Feb 16 17:32:01 0598 PST
-    | Wed Feb 16 17:32:01 1098 PST
-    | Sun Feb 16 17:32:01 1698 PST
-    | Fri Feb 16 17:32:01 1798 PST
+    | Thu Feb 16 17:32:01 0096 LMT BC
+    | Sun Feb 16 17:32:01 0098 LMT
+    | Fri Feb 16 17:32:01 0598 LMT
+    | Wed Feb 16 17:32:01 1098 LMT
+    | Sun Feb 16 17:32:01 1698 LMT
+    | Fri Feb 16 17:32:01 1798 LMT
     | Wed Feb 16 17:32:01 1898 PST
     | Mon Feb 16 17:32:01 1998 PST
     | Sun Feb 16 17:32:01 2098 PST
@@ -789,12 +800,12 @@ SELECT '' AS "64", d1 - interval '1 year
     | Wed Feb 14 17:32:01 1996 PST
     | Thu Feb 15 17:32:01 1996 PST
     | Fri Feb 16 17:32:01 1996 PST
-    | Mon Feb 16 17:32:01 0098 PST BC
-    | Thu Feb 16 17:32:01 0096 PST
-    | Tue Feb 16 17:32:01 0596 PST
-    | Sun Feb 16 17:32:01 1096 PST
-    | Thu Feb 16 17:32:01 1696 PST
-    | Tue Feb 16 17:32:01 1796 PST
+    | Mon Feb 16 17:32:01 0098 LMT BC
+    | Thu Feb 16 17:32:01 0096 LMT
+    | Tue Feb 16 17:32:01 0596 LMT
+    | Sun Feb 16 17:32:01 1096 LMT
+    | Thu Feb 16 17:32:01 1696 LMT
+    | Tue Feb 16 17:32:01 1796 LMT
     | Sun Feb 16 17:32:01 1896 PST
     | Fri Feb 16 17:32:01 1996 PST
     | Thu Feb 16 17:32:01 2096 PST
@@ -2724,13 +2735,13 @@ RESET DateStyle;
 SELECT to_timestamp('0097/Feb/16 --> 08:14:30', 'YYYY/Mon/DD --> HH:MI:SS');
          to_timestamp         
 ------------------------------
- Sat Feb 16 08:14:30 0097 PST
+ Sat Feb 16 08:14:30 0097 LMT
 (1 row)
 
 SELECT to_timestamp('97/2/16 8:14:30', 'FMYYYY/FMMM/FMDD FMHH:FMMI:FMSS');
          to_timestamp         
 ------------------------------
- Sat Feb 16 08:14:30 0097 PST
+ Sat Feb 16 08:14:30 0097 LMT
 (1 row)
 
 SELECT to_timestamp('1985 January 12', 'YYYY FMMonth DD');
@@ -2749,7 +2760,7 @@ SELECT to_timestamp('My birthday-> Year:
 SELECT to_timestamp('1,582nd VIII 21', 'Y,YYYth FMRM DD');
          to_timestamp         
 ------------------------------
- Sat Aug 21 00:00:00 1582 PST
+ Sat Aug 21 00:00:00 1582 LMT
 (1 row)
 
 SELECT to_timestamp('15 "text between quote marks" 98 54 45',
--- a/src/test/regress/expected/timestamptz.out
+++ b/src/test/regress/expected/timestamptz.out
@@ -297,12 +297,12 @@ SELECT '' AS "64", d1 FROM TIMESTAMPTZ_T
     | Fri Feb 14 17:32:01 1997 PST
     | Sat Feb 15 17:32:01 1997 PST
     | Sun Feb 16 17:32:01 1997 PST
-    | Tue Feb 16 17:32:01 0097 PST BC
-    | Sat Feb 16 17:32:01 0097 PST
-    | Thu Feb 16 17:32:01 0597 PST
-    | Tue Feb 16 17:32:01 1097 PST
-    | Sat Feb 16 17:32:01 1697 PST
-    | Thu Feb 16 17:32:01 1797 PST
+    | Tue Feb 16 17:32:01 0097 LMT BC
+    | Sat Feb 16 17:32:01 0097 LMT
+    | Thu Feb 16 17:32:01 0597 LMT
+    | Tue Feb 16 17:32:01 1097 LMT
+    | Sat Feb 16 17:32:01 1697 LMT
+    | Thu Feb 16 17:32:01 1797 LMT
     | Tue Feb 16 17:32:01 1897 PST
     | Sun Feb 16 17:32:01 1997 PST
     | Sat Feb 16 17:32:01 2097 PST
@@ -385,12 +385,12 @@ SELECT '' AS "15", d1 FROM TIMESTAMPTZ_T
 ----+---------------------------------
     | -infinity
     | Wed Dec 31 16:00:00 1969 PST
-    | Tue Feb 16 17:32:01 0097 PST BC
-    | Sat Feb 16 17:32:01 0097 PST
-    | Thu Feb 16 17:32:01 0597 PST
-    | Tue Feb 16 17:32:01 1097 PST
-    | Sat Feb 16 17:32:01 1697 PST
-    | Thu Feb 16 17:32:01 1797 PST
+    | Tue Feb 16 17:32:01 0097 LMT BC
+    | Sat Feb 16 17:32:01 0097 LMT
+    | Thu Feb 16 17:32:01 0597 LMT
+    | Tue Feb 16 17:32:01 1097 LMT
+    | Sat Feb 16 17:32:01 1697 LMT
+    | Thu Feb 16 17:32:01 1797 LMT
     | Tue Feb 16 17:32:01 1897 PST
     | Wed Feb 28 17:32:01 1996 PST
     | Thu Feb 29 17:32:01 1996 PST
@@ -453,12 +453,12 @@ SELECT '' AS "63", d1 FROM TIMESTAMPTZ_T
     | Fri Feb 14 17:32:01 1997 PST
     | Sat Feb 15 17:32:01 1997 PST
     | Sun Feb 16 17:32:01 1997 PST
-    | Tue Feb 16 17:32:01 0097 PST BC
-    | Sat Feb 16 17:32:01 0097 PST
-    | Thu Feb 16 17:32:01 0597 PST
-    | Tue Feb 16 17:32:01 1097 PST
-    | Sat Feb 16 17:32:01 1697 PST
-    | Thu Feb 16 17:32:01 1797 PST
+    | Tue Feb 16 17:32:01 0097 LMT BC
+    | Sat Feb 16 17:32:01 0097 LMT
+    | Thu Feb 16 17:32:01 0597 LMT
+    | Tue Feb 16 17:32:01 1097 LMT
+    | Sat Feb 16 17:32:01 1697 LMT
+    | Thu Feb 16 17:32:01 1797 LMT
     | Tue Feb 16 17:32:01 1897 PST
     | Sun Feb 16 17:32:01 1997 PST
     | Sat Feb 16 17:32:01 2097 PST
@@ -485,12 +485,12 @@ SELECT '' AS "16", d1 FROM TIMESTAMPTZ_T
     | -infinity
     | Wed Dec 31 16:00:00 1969 PST
     | Thu Jan 02 00:00:00 1997 PST
-    | Tue Feb 16 17:32:01 0097 PST BC
-    | Sat Feb 16 17:32:01 0097 PST
-    | Thu Feb 16 17:32:01 0597 PST
-    | Tue Feb 16 17:32:01 1097 PST
-    | Sat Feb 16 17:32:01 1697 PST
-    | Thu Feb 16 17:32:01 1797 PST
+    | Tue Feb 16 17:32:01 0097 LMT BC
+    | Sat Feb 16 17:32:01 0097 LMT
+    | Thu Feb 16 17:32:01 0597 LMT
+    | Tue Feb 16 17:32:01 1097 LMT
+    | Sat Feb 16 17:32:01 1697 LMT
+    | Thu Feb 16 17:32:01 1797 LMT
     | Tue Feb 16 17:32:01 1897 PST
     | Wed Feb 28 17:32:01 1996 PST
     | Thu Feb 29 17:32:01 1996 PST
--- a/src/test/regress/pg_regress.c
+++ b/src/test/regress/pg_regress.c
@@ -833,7 +833,7 @@ initialize_environment(void)
 	/*
 	 * Set timezone and datestyle for datetime-related tests
 	 */
-	putenv("PGTZ=PST8PDT");
+	putenv("PGTZ=America/Los_Angeles");
 	putenv("PGDATESTYLE=Postgres, MDY");
 
 	/*
--- a/src/test/regress/sql/horology.sql
+++ b/src/test/regress/sql/horology.sql
@@ -1,7 +1,9 @@
 --
 -- HOROLOGY
 --
-SET DateStyle = 'Postgres, MDY';
+
+SHOW TimeZone;  -- Many of these tests depend on the prevailing settings
+SHOW DateStyle;
 
 --
 -- Test various input formats
