public function getAdmissionTime()
    {
        if (isset($this->_gemsData['gap_admission_time']) && $this->_gemsData['gap_admission_time']) {
            if (! $this->_gemsData['gap_admission_time'] instanceof \MUtil_Date) {
                $this->_gemsData['gap_admission_time'] =
                        new \MUtil_Date($this->_gemsData['gap_admission_time'], \Gems_Tracker::DB_DATETIME_FORMAT);
            }
            // Clone to make sure calculations can be performed without changing this object
            return clone $this->_gemsData['gap_admission_time'];
        }
    }