1 files changed, 48 insertions, 0 deletions
diff --git a/StdLib/LibC/Time/TimeEfi.c b/StdLib/LibC/Time/TimeEfi.c
new file mode 100644
index 0000000000..7b062c917b
--- /dev/null
+++ b/StdLib/LibC/Time/TimeEfi.c
@@ -0,0 +1,48 @@
+/** @file
+  Transformations between the EFI_TIME structure and struct tm or time_t.
+
+  Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials are licensed and made available under
+  the terms and conditions of the BSD License that 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.
+
+**/
+#include  <Uefi.h>
+
+#include  <LibConfig.h>
+
+#include  <time.h>
+#include  "tzfile.h"
+#include  <MainData.h>
+
+/* Convert an EFI_TIME structure into a C Standard tm structure. */
+void
+EFIAPI
+Efi2Tm( EFI_TIME *ET, struct tm *BT)
+{
+  // Convert EFI time to broken-down time.
+  BT->tm_year = ET->Year - TM_YEAR_BASE;
+  BT->tm_mon = ET->Month - 1;   // BD time is zero based, EFI is 1 based
+  BT->tm_mday = ET->Day;
+  BT->tm_hour = ET->Hour;
+  BT->tm_min = ET->Minute;
+  BT->tm_sec = ET->Second;
+  BT->tm_isdst = -1;
+  BT->tm_zoneoff = ET->TimeZone;
+  BT->tm_daylight = ET->Daylight;
+  BT->tm_Nano = ET->Nanosecond;
+}
+
+/* Convert an EFI_TIME structure into a time_t value. */
+time_t
+EFIAPI
+Efi2Time( EFI_TIME *EfiBDtime)
+{
+  Efi2Tm( EfiBDtime, &gMD->BDTime);
+
+  return mktime( &gMD->BDTime);
+}