protected function getDurationTypeDropDownArray()
 {
     if ($this->model->getValueEvaluationType() == 'Date') {
         return TimeDurationUtil::getDateOnlyValueAndLabels();
     } elseif ($this->model->getValueEvaluationType() == 'DateTime') {
         return TimeDurationUtil::getValueAndLabels();
     } else {
         throw new NotSupportedException();
     }
 }