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

src/test/regress/expected/datetime.out

@@ -4,7 +4,7 @@ QUERY: INSERT INTO DATETIME_TBL VALUES ('now');
 QUERY: INSERT INTO DATETIME_TBL VALUES ('today');
 QUERY: INSERT INTO DATETIME_TBL VALUES ('yesterday');
 QUERY: INSERT INTO DATETIME_TBL VALUES ('tomorrow');
-QUERY: INSERT INTO DATETIME_TBL VALUES ('tomorrow PST');
+QUERY: INSERT INTO DATETIME_TBL VALUES ('tomorrow EST');
 QUERY: INSERT INTO DATETIME_TBL VALUES ('tomorrow zulu');
 QUERY: SELECT count(*) AS one FROM DATETIME_TBL WHERE d1 = 'today'::datetime;
 one