mysql>
mysql> select DATE_SUB(curdate(), INTERVAL '1 1' DAY_HOUR);
+----------------------------------------------+
| DATE_SUB(curdate(), INTERVAL '1 1' DAY_HOUR) |
+----------------------------------------------+
| 2007-07-20 23:00:00 |
+----------------------------------------------+
1 row in set (0.00 sec)
mysql>