Date Time Functions MySQL Tutorial

mysql>
mysql> SELECT SUBDATE('1998-01-02 12:00:00', 31);
+------------------------------------+
| SUBDATE('1998-01-02 12:00:00', 31) |
+------------------------------------+
| 1997-12-02 12:00:00                |
+------------------------------------+
1 row in set (0.00 sec)
mysql>