public function getFormattedDateRangeDate() {

    // Load session instance date range date values.
    $timestamp = $this->get('timestamp')->value;
    $year_start = date('Y', $timestamp);
    $month_day_start = date('M j', $timestamp);
    $timestamp_to = $this->get('timestamp_to')->value;
    $year_to = date('Y', $timestamp_to);
    $month_day_to = date('M j', $timestamp_to);

    // Format date range to eliminate repeated values.
    if ($year_start == $year_to) {
      if (date('M', $timestamp) == date('M', $timestamp_to)) {
        if ($month_day_start == $month_day_to) {
          // M j, Y.
          $formatted_date = "$month_day_start, $year_start";
        }
        else {
          // M j - j, Y.
          $day_to = date('j', $timestamp_to);
          $formatted_date =  "$month_day_start - $day_to, $year_start";
        }
      }
      else {
        // M j - M j, Y.
        $formatted_date =  "$month_day_start - $month_day_to, $year_start";
      }
    }
    else {
      // M j, Y - M j, Y.
      $formatted_date = $month_day_start . ", $year_start - " . $month_day_to . ", $year_to";
    }

    return $formatted_date;
  }