Date::__construct PHP Méthode

        public function __construct($year = null, $month = null, $day = null)
        {
            $this->year = $year;
            $this->month = $month;
            $this->day = $day;
        }

 public function __construct($dateTime, DateTimeZone $zone = null)
 {
     parent::__construct($dateTime);
     if ($zone) {
         $this->dateTime->setTimezone($zone);
     }
 }