ADDTIME() adds expr2 to expr1 and returns the result.
expr1 is a time or datetime expression, and expr2 is a time expression.
mysql>mysql> SELECT ADDTIME('1997-12-31 23:59:59.999999','1 1:1:1.000002');+--------------------------------------------------------+| ADDTIME('1997-12-31 23:59:59.999999','1 1:1:1.000002') |+--------------------------------------------------------+| 1998-01-02 01:01:01.000001 |+--------------------------------------------------------+1 row in set (0.00 sec)mysql>
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