MySQL Tutorial/Date Time Functions/ADDDATE
ADDDATE(date,INTERVAL expr unit),
<source lang="sql">
mysql> mysql> SELECT DATE_ADD("1998-01-02", INTERVAL 31 DAY); +-----------------------------------------+ | DATE_ADD("1998-01-02", INTERVAL 31 DAY) | +-----------------------------------------+ | 1998-02-02 | +-----------------------------------------+ 1 row in set (0.00 sec) mysql> mysql> SELECT ADDDATE("1998-01-02", INTERVAL 31 DAY); +----------------------------------------+ | ADDDATE("1998-01-02", INTERVAL 31 DAY) | +----------------------------------------+ | 1998-02-02 | +----------------------------------------+ 1 row in set (0.00 sec) mysql></source>
ADDDATE(expr,days)
MySQL treats the second argument as an integer number of days to be added to expr.
<source lang="sql">
mysql> mysql> SELECT ADDDATE("1998-01-02", 31); +---------------------------+ | ADDDATE("1998-01-02", 31) | +---------------------------+ | 1998-02-02 | +---------------------------+ 1 row in set (0.00 sec) mysql></source>