/**
  * @return int
  */
 protected function beginningOfTimerange()
 {
     if (date('w') == 0) {
         return strtotime($this->WeekStart->firstDayOfWeekForStrtotime() . " -" . $this->timerEnd . " weeks");
     }
     return strtotime($this->WeekStart->firstDayOfWeekForStrtotime() . " -" . ($this->timerEnd - 1) . " weeks");
 }