/**
  * Кэш календарей
  *
  * @static
  * @return CArrayList
  */
 public static function getCacheCalendars()
 {
     if (is_null(self::$_cacheCalendars)) {
         self::$_cacheCalendars = new CArrayList();
     }
     return self::$_cacheCalendars;
 }