/**
  * @param string $date_format
  *
  * @return ActiveRecordList
  */
 public static function dateFormat($date_format = 'd.m.Y - H:i:s')
 {
     $srModelObjectList = new ActiveRecordList(self::getCalledClass());
     $srModelObjectList->dateFormat($date_format);
     return $srModelObjectList;
 }