mysql>
mysql> SELECT '2004-13-12' + INTERVAL 1 DAY;
+-------------------------------+
| '2004-13-12' + INTERVAL 1 DAY |
+-------------------------------+
| NULL |
+-------------------------------+
1 row in set, 1 warning (0.00 sec)
mysql>
mysql> SHOW WARNINGS;
+---------+------+----------------------------------------+
| Level | Code | Message |
+---------+------+----------------------------------------+
| Warning | 1292 | Incorrect datetime value: '2004-13-12' |
+---------+------+----------------------------------------+
1 row in set (0.00 sec)
mysql>