Date format validation in PHP

Validate a date in “YYYY-MM-DD” format.

function checkDateFormat($date)

{

    //match the format of the date

    if (preg_match ("/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/", $date, $parts))

    {

        //check weather the date is valid of not

        if(checkdate($parts[2],$parts[3],$parts[1]))

            return true;

        else

        return false;

    }

    else

        return false;

}