private static function getEvents($lastDate)
 {
     $events = array();
     $fileReader = new FileReader($lastDate);
     while (($line = $fileReader->getLine()) != null) {
         if (is_a($line, "DateTime")) {
             $event = new ServerStartedEvent($line);
         } else {
             $event = Parser::parseLine($line);
         }
         if ($event && Utils::getTimestamp($event->date) > Utils::getTimestamp($lastDate)) {
             $events[] = $event;
         }
     }
     return $events;
 }