Question

is it possible to use date_sub like this ?

$dt = date("Y-m-d h:i:s");

$query = "INSERT INTO `table` (`date`) VALUES ('DATE_SUB('$dt', INTERVAL 15 DAY)')";

$result = MYSQL_QUERY($query);

Thanks

Answer 1

You could use it on database by removing the quotes around DATE_SUB(...).
But you should consider using the unix time stamp with time() and reconverting it to a date format using the date() function, like this:

$dt = date("Y-m-d h:i:s", time() - 15*24*3600); //today - 15 days

Works with PHP 4 and PHP 5.