--------------------+

SELECT TIMEDIFF('2008-12-31 23:59:59.000001', '2008-12-30 01:01:01.000002');
+----------------------------------------------------------------------+
| TIMEDIFF('2008-12-31 23:59:59.000001', '2008-12-30 01:01:01.000002') |
+----------------------------------------------------------------------+
| 46:58:57.999999                                                      |
+----------------------------------------------------------------------+

URL: https://mariadb.com/kb/en/timediff/https://mariadb.com/kb/en/timediff/