public function build()
 {
     foreach ($this->xmlConfig->days->day as $configDay) {
         $day = new Day();
         $day->setDate(new \DateTime($configDay->date));
         $day->setTitle($configDay->title);
         $day->setDescription($configDay->description);
         $day->setLink($configDay->link);
         $this->calendar->addDay($day);
     }
 }