public function getRTTBreach()
{
if ($rtt = $this->getRTT()) {
return $rtt->breach;
} elseif ($rtt_weeks = Yii::app()->params['ophtroperationboooking_rtt_limit']) {
return date('Y-m-d', strtotime('+' . $rtt_weeks . ' weeks', strtotime($this->decision_date)));
}
}