/**
  * override for adding desired dropoff and pickup dates
  */
 public function saveShippingMethodAction()
 {
     $dropoffDate = $this->getRequest()->getParam('dropoff_date');
     $pickupDate = $this->getRequest()->getParam('pickup_date');
     $dropoffTime = $this->getRequest()->getParam('dropoff_time');
     $pickupTime = $this->getRequest()->getParam('pickup_time');
     $dropoff = $dropoffDate . ' ' . $dropoffTime;
     $pickup = $pickupDate . ' ' . $pickupTime;
     $this->getOnepage()->getQuote()->setSendDatetime($dropoff);
     $this->getOnepage()->getQuote()->setReturnDatetime($pickup);
     parent::saveShippingMethodAction();
 }