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diff --git a/OldMdePkg/Include/Dxe/ArchProtocol/RealTimeClock.h b/OldMdePkg/Include/Dxe/ArchProtocol/RealTimeClock.h
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+++ b/OldMdePkg/Include/Dxe/ArchProtocol/RealTimeClock.h
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+/** @file
+  Real Time clock Architectural Protocol as defined in DXE CIS
+
+  This code abstracts time and data functions. Used to provide
+  Time and date related EFI runtime services.
+
+  The GetTime (), SetTime (), GetWakeupTime (), and SetWakeupTime () EFI 1.0
+  services are added to the EFI system table and the 
+  EFI_REAL_TIME_CLOCK_ARCH_PROTOCOL_GUID protocol is registered with a NULL 
+  pointer.
+
+  No CRC of the EFI system table is required, as it is done in the DXE core.
+
+  Copyright (c) 2006, Intel Corporation                                                         
+  All rights reserved. This program and the accompanying materials                          
+  are licensed and made available under the terms and conditions of the BSD License         
+  which accompanies this distribution.  The full text of the license may be found at        
+  http://opensource.org/licenses/bsd-license.php                                            
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+
+  Module Name:  RealTimeClock.h
+
+  @par Revision Reference:
+  Version 0.91B.
+
+**/
+
+#ifndef __ARCH_PROTOCOL_REAL_TIME_CLOCK_H__
+#define __ARCH_PROTOCOL_REAL_TIME_CLOCK_H__
+
+//
+// Global ID for the Real Time Clock Architectural Protocol
+//
+#define EFI_REAL_TIME_CLOCK_ARCH_PROTOCOL_GUID \
+  { 0x27CFAC87, 0x46CC, 0x11d4, {0x9A, 0x38, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D } }
+
+extern EFI_GUID gEfiRealTimeClockArchProtocolGuid;
+
+#endif