public function addExcludeDay($day)
 {
     if (!is_int($day) || $day < 1 || $day > 31) {
         throw new \DomainException("You must describe days of the month using integers between 1 and 31");
     } else {
         parent::addExcludeDay($day);
     }
 }
 public function addExcludeDay($day)
 {
     if (!is_int($day) || $day < 0 || $day > 6) {
         throw new \DomainException("You must describe days of the week using integers between 0 and 6");
     } else {
         parent::addExcludeDay($day);
     }
 }