$expiredate='2009/03/31';
$cdate='2009/03/03';
$dateDiff = $expiredate - $cdate;
$fullDays = floor($dateDiff/(60*60*24));

the above method i am using to find the difference between two date.but it is not working.can any one tell me how to find the difference using php.

You have to convert the dates to unixtimestamp using strtotime.

thanks i got it

$expiredate=strtotime("2009-04-03");
$cdate=strtotime("2009-03-31");
$dateDiff = $expiredate - $cdate;
$fullDays = floor($dateDiff/(60*60*24));
echo $fullDays ;