reactos/ntoskrnl/ex/time.c

   1 /* $Id: time.c,v 1.10 2000/06/07 13:04:34 ekohl Exp $
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            kernel/excutive/time.c
   6  * PURPOSE:         Time
   7  * PROGRAMMER:      David Welch (welch@mcmail.com)
   8  * UPDATE HISTORY:
   9  *                  Created 22/05/98
  10  */
  11
  12 /* INCLUDES *****************************************************************/
  13
  14 #include <ddk/ntddk.h>
  15 #include <internal/ex.h>
  16 #include <string.h>
  17
  18 #include <internal/debug.h>
  19
  20
  21 #define TICKSPERMINUTE  600000000
  22
  23 /* GLOBALS ******************************************************************/
  24
  25 /* Note: Bias[minutes] = UTC - local time */
  26 TIME_ZONE_INFORMATION _SystemTimeZoneInfo;
  27
  28
  29 /* FUNCTIONS ****************************************************************/
  30
  31 VOID
  32 ExInitTimeZoneInfo (VOID)
  33 {
  34   /* Initialize system time zone information */
  35   memset (& _SystemTimeZoneInfo, 0, sizeof(TIME_ZONE_INFORMATION));
  36
  37   /* FIXME: Read time zone information from the registry */
  38
  39 }
  40
  41
  42 NTSTATUS
  43 STDCALL
  44 NtSetSystemTime (
  45         IN      PLARGE_INTEGER  SystemTime,
  46         IN      PLARGE_INTEGER  NewSystemTime   OPTIONAL
  47         )
  48 {
  49 //        HalSetRealTimeClock ((PTIME)SystemTime);
  50 //        UNIMPLEMENTED;
  51         return STATUS_SUCCESS;
  52 }
  53
  54
  55 NTSTATUS
  56 STDCALL
  57 NtQuerySystemTime (
  58         OUT     TIME    * CurrentTime
  59         )
  60 {
  61         KeQuerySystemTime((PLARGE_INTEGER)CurrentTime);
  62         return STATUS_SUCCESS;
  63 }
  64
  65
  66 VOID
  67 STDCALL
  68 ExLocalTimeToSystemTime (
  69         PLARGE_INTEGER  LocalTime,
  70         PLARGE_INTEGER  SystemTime
  71         )
  72 {
  73    SystemTime->QuadPart = LocalTime->QuadPart +
  74                           _SystemTimeZoneInfo.Bias * TICKSPERMINUTE;
  75 }
  76
  77
  78 VOID
  79 STDCALL
  80 ExSystemTimeToLocalTime (
  81         PLARGE_INTEGER  SystemTime,
  82         PLARGE_INTEGER  LocalTime
  83         )
  84 {
  85    LocalTime->QuadPart = SystemTime->QuadPart -
  86                          _SystemTimeZoneInfo.Bias * TICKSPERMINUTE;
  87 }
  88
  89 /* EOF */