public function dateIsInRange(\DateTime $date) {
    $dateInRange = FALSE;

    $t1 = $this->start_date->getTimeStamp();
    $t2 = $this->end_date->getTimeStamp();

    $t3 = $date->getTimeStamp();

    if (($t3 >= $t1) && ($t3 <= $t2)) {
      $dateInRange = TRUE;
    }

    return $dateInRange;
  }