ADDDATE('2005-12-31', INTERVAL '3:30' HOUR_MINUTE) returns '2005-12-31 03:30:00'.
mysql>
mysql> select ADDDATE('2005-12-31', INTERVAL '3:30' HOUR_MINUTE);
+----------------------------------------------------+
| ADDDATE('2005-12-31', INTERVAL '3:30' HOUR_MINUTE) |
+----------------------------------------------------+
| 2005-12-31 03:30:00 |
+----------------------------------------------------+
1 row in set (0.00 sec)
mysql>
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