reactos/ntoskrnl/ex/time.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            kernel/excutive/time.c
   5  * PURPOSE:         Time
   6  * PROGRAMMER:      David Welch (welch@mcmail.com)
   7  * UPDATE HISTORY:
   8  *                  Created 22/05/98
   9  */
  10
  11 /* INCLUDES *****************************************************************/
  12
  13 #include <ddk/ntddk.h>
  14
  15 #include <internal/debug.h>
  16
  17
  18 #define TICKSPERMINUTE  600000000
  19
  20 /* GLOBALS ******************************************************************/
  21
  22 static LONG lTimeZoneBias = 0;  /* bias[minutes] = UTC - local time */
  23
  24 /* FUNCTIONS ****************************************************************/
  25
  26 NTSTATUS
  27 STDCALL
  28 NtSetSystemTime (
  29         IN      PLARGE_INTEGER  SystemTime,
  30         IN      PLARGE_INTEGER  NewSystemTime   OPTIONAL
  31         )
  32 {
  33         UNIMPLEMENTED;
  34 }
  35
  36
  37 NTSTATUS
  38 STDCALL
  39 NtQuerySystemTime (
  40         OUT     TIME    * CurrentTime
  41         )
  42 {
  43         KeQuerySystemTime((PLARGE_INTEGER)CurrentTime);
  44         return STATUS_SUCCESS;
  45 }
  46
  47
  48 VOID
  49 ExLocalTimeToSystemTime (
  50         PLARGE_INTEGER  LocalTime,
  51         PLARGE_INTEGER  SystemTime
  52         )
  53 {
  54    SystemTime->QuadPart = LocalTime->QuadPart +
  55                           lTimeZoneBias * TICKSPERMINUTE;
  56 }
  57
  58
  59 VOID
  60 ExSystemTimeToLocalTime (
  61         PLARGE_INTEGER  SystemTime,
  62         PLARGE_INTEGER  LocalTime
  63         )
  64 {
  65    LocalTime->QuadPart = SystemTime->QuadPart -
  66                          lTimeZoneBias * TICKSPERMINUTE;
  67 }