SUBDATE(, ) allows you to subtract a specified number of days from a date:
mysql>
mysql>
mysql> SELECT SUBDATE('2004-12-31 23:59:59', 31);
+------------------------------------+
| SUBDATE('2004-12-31 23:59:59', 31) |
+------------------------------------+
| 2004-11-30 23:59:59 |
+------------------------------------+
1 row in set (0.00 sec)
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