public function setBirthday($value)
    {
        if ($value) {
            $value = new DateTime($value, new DateTimeZone('UTC'));
        } else {
            $value = null;
        }

        return $this->setParameter('birthday', $value);
    }
public function setBirthday($value)
    {
        if ($value) {
            $value = new DateTime($value, new DateTimeZone('UTC'));
        } else {
            $value = null;
        }

        return $this->setParameter('birthday', $value);
    }
public function setBirthday ( $ value ) { if ( $ value ) { $ value = new DateTime ( $ value , new DateTimeZone ( 'UTC' ) ) ; } else { $ value = null ; } return $ this -> setParameter ( 'birthday' , $ value ) ; }
Sets the cardholder's birthday.

@param string $value
@return $this
Sets the cardholder s birthday .