mysql> select addtime('1997-12-31 23:59:52' , '1 1:1:1');+--------------------------------------------+| addtime('1997-12-31 23:59:52' , '1 1:1:1') |+--------------------------------------------+| 1998-01-02 01:00:53                        |+--------------------------------------------+1 row in set (0.00 sec)

 

 

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