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[NTOS:EX] Use RtlCutoverTimeToSystemTime to determine the current time zone id

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CORE-14658
This commit is contained in:
Eric Kohl 2021-04-03 09:38:07 +02:00
parent 97a23a5f3d
commit c449929fef
2 changed files with 75 additions and 11 deletions
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77
ntoskrnl/ex/time.c
View file

@ -225,6 +225,8 @@ BOOLEAN
NTAPI
ExRefreshTimeZoneInformation(IN PLARGE_INTEGER CurrentBootTime)
{
LARGE_INTEGER StandardTime;
LARGE_INTEGER DaylightTime;
LARGE_INTEGER CurrentTime;
NTSTATUS Status;
@ -232,20 +234,73 @@ ExRefreshTimeZoneInformation(IN PLARGE_INTEGER CurrentBootTime)
Status = RtlQueryTimeZoneInformation(&ExpTimeZoneInfo);
if (!NT_SUCCESS(Status))
{
/* Failed, clear all data */
RtlZeroMemory(&ExpTimeZoneInfo, sizeof(RTL_TIME_ZONE_INFORMATION));
ExpTimeZoneBias.QuadPart = (LONGLONG)0;
ExpTimeZoneId = TIME_ZONE_ID_UNKNOWN;
DPRINT1("RtlQueryTimeZoneInformation() failed (Status 0x%08lx)\n", Status);
return FALSE;
}
/* Get the default bias */
ExpTimeZoneBias.QuadPart = (LONGLONG)ExpTimeZoneInfo.Bias * TICKSPERMINUTE;
if (ExpTimeZoneInfo.StandardDate.Month != 0 &&
ExpTimeZoneInfo.DaylightDate.Month != 0)
{
/* Get this years standard start time */
if (!RtlCutoverTimeToSystemTime(&ExpTimeZoneInfo.StandardDate,
&StandardTime,
CurrentBootTime,
TRUE))
{
DPRINT1("RtlCutoverTimeToSystemTime() for StandardDate failed!\n");
return FALSE;
}
/* Get this years daylight start time */
if (!RtlCutoverTimeToSystemTime(&ExpTimeZoneInfo.DaylightDate,
&DaylightTime,
CurrentBootTime,
TRUE))
{
DPRINT1("RtlCutoverTimeToSystemTime() for DaylightDate failed!\n");
return FALSE;
}
/* Determine the time zone id and update the time zone bias */
if (DaylightTime.QuadPart < StandardTime.QuadPart)
{
if ((CurrentBootTime->QuadPart >= DaylightTime.QuadPart) &&
(CurrentBootTime->QuadPart < StandardTime.QuadPart))
{
DPRINT("Daylight time!\n");
ExpTimeZoneId = TIME_ZONE_ID_DAYLIGHT;
ExpTimeZoneBias.QuadPart += (LONGLONG)ExpTimeZoneInfo.DaylightBias * TICKSPERMINUTE;
}
else
{
DPRINT("Standard time!\n");
ExpTimeZoneId = TIME_ZONE_ID_STANDARD;
ExpTimeZoneBias.QuadPart += (LONGLONG)ExpTimeZoneInfo.StandardBias * TICKSPERMINUTE;
}
}
else
{
if ((CurrentBootTime->QuadPart >= StandardTime.QuadPart) &&
(CurrentBootTime->QuadPart < DaylightTime.QuadPart))
{
DPRINT("Standard time!\n");
ExpTimeZoneId = TIME_ZONE_ID_STANDARD;
ExpTimeZoneBias.QuadPart += (LONGLONG)ExpTimeZoneInfo.StandardBias * TICKSPERMINUTE;
}
else
{
DPRINT("Daylight time!\n");
ExpTimeZoneId = TIME_ZONE_ID_DAYLIGHT;
ExpTimeZoneBias.QuadPart += (LONGLONG)ExpTimeZoneInfo.DaylightBias * TICKSPERMINUTE;
}
}
}
else
{
/* FIXME: Calculate transition dates */
/* Set bias and ID */
ExpTimeZoneBias.QuadPart = ((LONGLONG)(ExpTimeZoneInfo.Bias +
ExpTimeZoneInfo.StandardBias)) *
TICKSPERMINUTE;
ExpTimeZoneId = TIME_ZONE_ID_STANDARD;
ExpTimeZoneId = TIME_ZONE_ID_UNKNOWN;
}
/* Change it for user-mode applications */

9
sdk/include/ndk/rtlfuncs.h
View file

@ -4533,6 +4533,15 @@ RtlIpv6StringToAddressExW(
//
// Time Functions
//
NTSYSAPI
BOOLEAN
NTAPI
RtlCutoverTimeToSystemTime(
_In_ PTIME_FIELDS CutoverTimeFields,
_Out_ PLARGE_INTEGER SystemTime,
_In_ PLARGE_INTEGER CurrentTime,
_In_ BOOLEAN ThisYearsCutoverOnly);
NTSYSAPI
NTSTATUS
NTAPI