date_diff

function date_diff($sdate, $edate)
{
 $_sdate = explode("-", $sdate);
 $_edate = explode("-", $edate);

 $tmp1 = mktime(0, 0, 0, $_sdate[1], $_sdate[2], $_sdate[0]);
 $tmp2 = mktime(0, 0, 0, $_edate[1], $_edate[2], $_edate[0]);

 return($tmp2 - $tmp1) / 86400 + 1;
}