diff -ruN postgresql-7.4.13-old/src/bin/pg_dump/pg_dump.c postgresql-7.4.13/src/bin/pg_dump/pg_dump.c
--- postgresql-7.4.13-old/src/bin/pg_dump/pg_dump.c	2002-12-27 17:10:55.000000000 +0000
+++ postgresql-7.4.13/src/bin/pg_dump/pg_dump.c	2003-03-03 06:13:49.000000000 +0000
@@ -563,6 +563,13 @@
 			exit_horribly(g_fout, NULL, "could not set transaction isolation level to serializable: %s",
 						  PQerrorMessage(g_conn));
 		PQclear(res);
+
+		/* Set datestyle to ISO to ensure portability */
+		res = PQexec(g_conn, "SET DATESTYLE = ISO");
+		if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
+			exit_horribly(g_fout, NULL, "could not set datestyle to ISO: %s",
+						  PQerrorMessage(g_conn));
+		PQclear(res);
 	}
 
 	if (g_fout->remoteVersion < 70300)
