date_sub
Description
Syntax
INT DATE_SUB(DATETIME date,INTERVAL expr type)
Subtract the specified time interval from the date
The date parameter is a valid date expression.
The expr parameter is the interval you want to add.
Sweet, sweet, sweet
example
mysql> select date_sub('2010-11-30 23:59:59', INTERVAL 2 DAY);
+-------------------------------------------------+
| date_sub('2010-11-30 23:59:59', INTERVAL 2 DAY) |
+-------------------------------------------------+
| 2010-11-28 23:59:59 |
+-------------------------------------------------+