Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -r98a1a2a624373a1d140daed0136522ab6e635237 -r46bf7baaa9d8095e0405b018fcd4bc594907797e
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 98a1a2a624373a1d140daed0136522ab6e635237)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 46bf7baaa9d8095e0405b018fcd4bc594907797e)
@@ -26,6 +26,7 @@
 #include "Pressures.h"
 #include "Reservoirs.h"
 #include "ROPump.h"
+#include "RTC.h"
 #include "SystemComm.h"
 #include "SystemCommMessages.h"
 #include "TaskGeneral.h"
@@ -192,7 +193,7 @@
     else if ( TRUE == pendingStartDGRequest )
     {
         pendingStartDGRequest = FALSE;
-
+        signalSyncToHD();
         requestNewOperationMode( DG_MODE_GENE );
     }
     else if ( TRUE == pendingStartDGFlushRequest )
Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -ra4669c80291e85fa5ce17d77ebcfd0c882831202 -r46bf7baaa9d8095e0405b018fcd4bc594907797e
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision a4669c80291e85fa5ce17d77ebcfd0c882831202)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 46bf7baaa9d8095e0405b018fcd4bc594907797e)
@@ -811,6 +811,10 @@
             handleAlarmClear( message );
             break;
 
+        case MSG_ID_RTC_EPOCH:
+            handleRTCSyncFromHD( message );
+            break;
+
         case MSG_ID_SET_DG_DIALYSATE_TEMP_TARGETS:
             handleSetDialysateTemperatureCmd( message );
             break;
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r98a1a2a624373a1d140daed0136522ab6e635237 -r46bf7baaa9d8095e0405b018fcd4bc594907797e
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 98a1a2a624373a1d140daed0136522ab6e635237)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 46bf7baaa9d8095e0405b018fcd4bc594907797e)
@@ -393,6 +393,30 @@
 
 /*********************************************************************//**
  * @brief
+ * The handleRTCSyncFromHD function handles an HD date/time broadcast message
+ * from the HD.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleRTCSyncFromHD( MESSAGE_T *message )
+{
+    // Only sync RTC to HD date/time when ...
+    if ( TRUE == syncDG2HDDateTime() )
+    {
+        if ( sizeof( RTC_DATA_T ) == message->hdr.payloadLen )
+        {
+            RTC_DATA_T epoch;
+
+            memcpy( &epoch, message->payload, sizeof( RTC_DATA_T ) );
+            setRTCEpoch( epoch.epochTime );
+        }
+    }
+}
+
+/*********************************************************************//**
+ * @brief
  * The handleAlarmClear function handles a clear alarm message from the HD.
  * @details Inputs: none
  * @details Outputs: message handled
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r0f6b35ef8da4d30793a181750d0a6d5898118120 -r46bf7baaa9d8095e0405b018fcd4bc594907797e
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 0f6b35ef8da4d30793a181750d0a6d5898118120)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 46bf7baaa9d8095e0405b018fcd4bc594907797e)
@@ -80,6 +80,9 @@
 // MSG_ID_POWER_OFF_WARNING
 void handlePowerOffWarning( MESSAGE_T *message );
 
+// MSG_ID_RTC_EPOCH
+void handleRTCSyncFromHD( MESSAGE_T *message );
+
 // MSG_ID_ALARM_CLEARED
 void handleAlarmClear( MESSAGE_T *message );