CC-3478: Calendar->Show has some inconsistencies on special Days (e.g.

switching to Daylight Saving Time)

- added exception handling

airtime_mvc/application/controllers/ScheduleController.php

@@ -900,6 +900,7 @@ class ScheduleController extends Zend_Controller_Action
         $startParam = $this->_getParam('startTime');
         $endParam = $this->_getParam('endTime');
         
+        try{
             $startDateTime = new DateTime($startParam);
             $endDateTime = new DateTime($endParam);
         
@@ -909,6 +910,9 @@ class ScheduleController extends Zend_Controller_Action
             $duration = $UTCEndDateTime->diff($UTCStartDateTime);
         
             $result = $duration->format('%r%Hh %Im');
+        }catch (Exception $e){
+            $result = "Invalid Date";
+        }
         
         echo Zend_Json::encode($result);
         exit();