Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -r35de566c96433689821b7a21f731df26b40d67ae -r39841b84f399b7b3233822942c39efba24ffcd12
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 35de566c96433689821b7a21f731df26b40d67ae)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 39841b84f399b7b3233822942c39efba24ffcd12)
@@ -1040,15 +1040,18 @@
             handleStartStopTrimmerHeaterCmd( message );
             break;
 
-        case MSG_ID_DG_TESTER_LOGIN_REQUEST:
-            handleTesterLogInRequest( message );
-            break;
-
         case MSG_ID_DG_START_STOP_HEAT_DISINFECT:
             handleStartStopDGHeatDisinfect( message );
             break;
 
+        case MSG_ID_UI_DG_SET_RTC_REQUEST:
+            handleUIClockSyncRequest( message );
+            break;
 
+        case MSG_ID_DG_TESTER_LOGIN_REQUEST:
+            handleTesterLogInRequest( message );
+            break;
+
         default:
             // unrecognized message ID received - ok, ignore - may be a test message handled below
             break;
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r23120d5201ec71f5bf9597c4951524652e3672ad -r39841b84f399b7b3233822942c39efba24ffcd12
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 23120d5201ec71f5bf9597c4951524652e3672ad)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 39841b84f399b7b3233822942c39efba24ffcd12)
@@ -2934,6 +2934,51 @@
 }
 
 /*********************************************************************//**
+ * @brief
+ * The handleUIClockSyncRequest function handles a UI clock sync message.
+ * @details Inputs: none
+ * @details Outputs: message handled, response constructed and queued for transmit.
+ * @param messagePtr pointer to the message to handle.
+ * @return none
+ *************************************************************************/
+void handleUIClockSyncRequest( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
+    U32 rejReason = REQUEST_REJECT_REASON_NONE;
+    MESSAGE_T msg;
+    U08 *payloadPtr = msg.payload;
+
+    if ( message->hdr.payloadLen == sizeof( U32 ) )
+    {
+        U32 epoch;
+
+        memcpy( &epoch,  message->payload, sizeof( U32 ) );
+        result = setRTCEpoch( epoch );
+        if ( FALSE == result )
+        {
+            rejReason = REQUEST_REJECT_REASON_INVALID_DATE_OR_TIME;
+        }
+    }
+    else
+    {
+        rejReason = REQUEST_REJECT_REASON_INVALID_REQUEST_FORMAT;
+    }
+
+    // Create a response message record
+    blankMessage( &msg );
+    msg.hdr.msgID = MSG_ID_DG_UI_SET_RTC_RESPONSE;
+    msg.hdr.payloadLen = sizeof( BOOL ) + sizeof( U32 );
+    memcpy( payloadPtr, &result, sizeof( BOOL ) );
+    payloadPtr += sizeof( BOOL );
+    memcpy( payloadPtr, &rejReason, sizeof( U32 ) );
+
+    // Serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
+    result = serializeMessage( msg, COMM_BUFFER_OUT_CAN_DG_2_UI, ACK_REQUIRED );
+
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_DG_2_UI, result );
+}
+
+/*********************************************************************//**
 * @brief
 * The handleSetDGCalibrationRecord function handles a request to set the DG
 * calibration data record.
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r23120d5201ec71f5bf9597c4951524652e3672ad -r39841b84f399b7b3233822942c39efba24ffcd12
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 23120d5201ec71f5bf9597c4951524652e3672ad)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 39841b84f399b7b3233822942c39efba24ffcd12)
@@ -320,6 +320,9 @@
 // MSG_ID_DG_START_STOP_HEAT_DISINFECT
 BOOL handleStartStopDGHeatDisinfect( MESSAGE_T *message );
 
+// MSG_ID_UI_DG_SET_RTC_REQUEST
+void handleUIClockSyncRequest( MESSAGE_T *message );
+
 // MSG_ID_DG_SET_CALIBRATION_DATA
 void handleSetDGCalibrationRecord( MESSAGE_T *message );