Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -ra9160f295f6baf4fad4a8e2a739782f6df7d177a -r326e3597e1555ef2ac4978f58786e7ce638b1287
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision a9160f295f6baf4fad4a8e2a739782f6df7d177a)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 326e3597e1555ef2ac4978f58786e7ce638b1287)
@@ -1046,27 +1046,72 @@
  * The handleDGCmdResp function handles a DG command response message.
  * @details Inputs: none
  * @details Outputs: message handled, response constructed and queued for transmit.
- * @param messagePtr pointer to the message to handle.
+ * @param message pointer to the message to handle.
  * @return none
  *************************************************************************/
-void handleDGCmdResp( MESSAGE_T *messagePtr )
+void handleDGCmdResp( MESSAGE_T *message )
 {
     BOOL result = FALSE;
 
-    if ( messagePtr->hdr.payloadLen == sizeof( DG_CMD_RESPONSE_T ) )
+    if ( message->hdr.payloadLen == sizeof( DG_CMD_RESPONSE_T ) )
     {
         DG_CMD_RESPONSE_T dgCmdResponse;
 
         result = TRUE;
-        memcpy( &dgCmdResponse,  messagePtr->payload, sizeof( DG_CMD_RESPONSE_T ) );
+        memcpy( &dgCmdResponse,  message->payload, sizeof( DG_CMD_RESPONSE_T ) );
         handleDGCommandResponse( &dgCmdResponse );
     }
 
-    sendAckResponseMsg( (MSG_ID_T)messagePtr->hdr.msgID, COMM_BUFFER_OUT_CAN_HD_2_DG, result );
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_HD_2_DG, result );
 }
 
 /*********************************************************************//**
  * @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_HD_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_HD_2_UI, ACK_REQUIRED );
+
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_HD_2_UI, result );
+}
+
+/*********************************************************************//**
+ * @brief
  * The handleDGOpMode function handles a DG broadcast of its current mode.
  * @details Inputs: none
  * @details Outputs: message handled, response constructed and queued for transmit.