Use the ADDDATE() function to add 10 hours and 20 minutes to the specified date/time value
mysql>
mysql>
mysql> SELECT ADDDATE('2004-10-31 13:39:59', INTERVAL '10:20' HOUR_MINUTE);
+--------------------------------------------------------------+
| ADDDATE('2004-10-31 13:39:59', INTERVAL '10:20' HOUR_MINUTE) |
+--------------------------------------------------------------+
| 2004-10-31 23:59:59 |
+--------------------------------------------------------------+
1 row in set (0.00 sec)
mysql>
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