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mysql> set @x='2009-12-02 14:20:20';
Query OK, 0 rows affected (0.00 sec)
mysql> select date(@x+interval 1 month)-interval day(@x) day ;
+------------------------------------------------+
| date(@x+interval 1 month)-interval day(@x) day |
+------------------------------------------------+
| 2009-12-31 |
+------------------------------------------------+
1 row in set (0.00 sec)
mysql>