Change one date away from PST to avoid trouble after daylight savings time.

src/test/regress/sql/datetime.sql

@@ -10,7 +10,7 @@ INSERT INTO DATETIME_TBL VALUES ('now');
 INSERT INTO DATETIME_TBL VALUES ('today');
 INSERT INTO DATETIME_TBL VALUES ('yesterday');
 INSERT INTO DATETIME_TBL VALUES ('tomorrow');
-INSERT INTO DATETIME_TBL VALUES ('tomorrow PST');
+INSERT INTO DATETIME_TBL VALUES ('tomorrow EST');
 INSERT INTO DATETIME_TBL VALUES ('tomorrow zulu');
 
 SELECT count(*) AS one FROM DATETIME_TBL WHERE d1 = 'today'::datetime;