function PF_IsDate($v){ if (preg_match("/^[0-9]{4}(-|/)[0-9]{1,2}(\1)[0-9]{1,2}(|s+[0-9]{1,2}(|:[0-9]{1,2}(|:[0-9]{1,2})))$/",$v)){ return true; }else{ return false; } }