diff --git a/modules/Calendar/actions/SaveAjax.php b/modules/Calendar/actions/SaveAjax.php
index 2efc4008..8c17b14d 100644
--- a/modules/Calendar/actions/SaveAjax.php
+++ b/modules/Calendar/actions/SaveAjax.php
@@ -141,17 +141,19 @@ public function getRecordModelFromRequest(Vtiger_Request $request) {
 			}
 			$recordModel->set('visibility', ucfirst($sharedType));
 		}
-
-        $time = (strtotime($endTime))- (strtotime($startTime));
-        $diffinSec=  (strtotime($endDate))- (strtotime($startDate));
-        $diff_days=floor($diffinSec/(60*60*24));
-          
-        $hours=((float)$time/3600)+($diff_days*24);
-        $minutes = ((float)$hours-(int)$hours)*60;  
-        
-        $recordModel->set('duration_hours', (int)$hours);
-		$recordModel->set('duration_minutes', round($minutes,0)); 
-        
+		
+		if (!empty($endTime)) {
+			// events only
+			$time = (strtotime($endTime))- (strtotime($startTime));
+			$diffinSec=  (strtotime($endDate))- (strtotime($startDate));
+			$diff_days=floor($diffinSec/(60*60*24));
+			  
+			$hours=((float)$time/3600)+($diff_days*24);
+			$minutes = ((float)$hours-(int)$hours)*60;  
+			
+			$recordModel->set('duration_hours', (int)$hours);
+			$recordModel->set('duration_minutes', round($minutes,0)); 
+        }
 		return $recordModel;
 	}
 }
diff --git a/modules/Vtiger/uitypes/Time.php b/modules/Vtiger/uitypes/Time.php
index 64aad707..fb3d0213 100644
--- a/modules/Vtiger/uitypes/Time.php
+++ b/modules/Vtiger/uitypes/Time.php
@@ -104,9 +104,12 @@ public static function getTimeValueWithSeconds($time) {
 	 */
 	public function getDisplayValue($value, $record = false, $recordInstance = false) {
 		$userModel = Users_Privileges_Model::getCurrentUserModel();
-		$dateTimeValueObj = DateTimeField::convertToUserTimeZone($value);
-		$value = $dateTimeValueObj->format('H:i');
-		if($userModel->get('hour_format') == '12'){
+		// exclude UI 63 field with different time format  (duration_hours)
+		if (strpos($value, ':') !== false) {
+			$dateTimeValueObj = DateTimeField::convertToUserTimeZone($value);
+			$value = $dateTimeValueObj->format('H:i');
+		}
+		if($userModel->get('hour_format') == '12' && strpos($value, ':') !== false){
 			return self::getTimeValueInAMorPM($value);
 		}
 		return $value;
@@ -118,7 +121,7 @@ public function getDisplayValue($value, $record = false, $recordInstance = false
 	 * @return converted value
 	 */
 	public function getEditViewDisplayValue($value) {
-		$dateTimeValueObj = DateTimeField::convertToUserTimeZone($value);
+        $dateTimeValueObj = DateTimeField::convertToUserTimeZone($value);
 		$value = $dateTimeValueObj->format('H:i');
 		return self::getTimeValueInAMorPM($value);
 	}