private function getSessionExclusions(array $class) {
    $exclusions = [];
    if (isset($class['exclusions'])) {
      foreach ($class['exclusions'] as $exclusion) {
        $exclusionStart = (new \DateTime($exclusion . '00:00:00'))->format('Y-m-d\TH:i:s');
        $exclusionEnd = (new \DateTime($exclusion . '24:00:00'))->format('Y-m-d\TH:i:s');
        $exclusions[] = [
          'value' => $exclusionStart,
          'end_value' => $exclusionEnd,
        ];
      }
    }

    return $exclusions;
  }