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windows-server-2003/base/win32/client/datetime.c

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/*++
Copyright (c) 1990 Microsoft Corporation
Module Name:
datetime.c
Abstract:
This module implements Win32 time of day functions
Author:
Mark Lucovsky (markl) 08-Oct-1990
Revision History:
--*/
#include "basedll.h"
#define IsActiveConsoleSession() (USER_SHARED_DATA->ActiveConsoleId == NtCurrentPeb()->SessionId)
ULONG
CalcClientTimeZoneIdAndBias(
IN CONST TIME_ZONE_INFORMATION *ptzi,
OUT KSYSTEM_TIME *pBias);
BOOL IsTimeZoneRedirectionEnabled();
VOID
WINAPI
GetLocalTime(
LPSYSTEMTIME lpLocalTime
)
/*++
Routine Description:
The current local system date and time can be returned using
GetLocalTime.
Arguments:
lpLocalTime - Returns the current system date and time:
SYSTEMTIME Structure:
WORD wYear - Returns the current year.
WORD wMonth - Returns the current month with January equal to 1.
WORD wDayOfWeek - Returns the current day of the week where
0=Sunday, 1=Monday...
WORD wDay - Returns the current day of the month.
WORD wHour - Returns the current hour.
WORD wMinute - Returns the current minute within the hour.
WORD wSecond - Returns the current second within the minute.
WORD wMilliseconds - Returns the current millisecond within the
second.
Return Value:
None.
--*/
{
LARGE_INTEGER LocalTime;
LARGE_INTEGER SystemTime;
LARGE_INTEGER Bias;
TIME_FIELDS TimeFields;
volatile KSYSTEM_TIME *pRealBias;
if(IsTimeZoneRedirectionEnabled()) {
pRealBias=&(BaseStaticServerData->ktTermsrvClientBias);
} else {
pRealBias=&(USER_SHARED_DATA->TimeZoneBias);
}
//
// Read system time from shared region.
//
do {
SystemTime.HighPart = USER_SHARED_DATA->SystemTime.High1Time;
SystemTime.LowPart = USER_SHARED_DATA->SystemTime.LowPart;
} while (SystemTime.HighPart != USER_SHARED_DATA->SystemTime.High2Time);
//
// Read time zone bias from shared region.
// If it's terminal server session use client bias.
do {
Bias.HighPart = pRealBias->High1Time;
Bias.LowPart = pRealBias->LowPart;
} while (Bias.HighPart != pRealBias->High2Time);
LocalTime.QuadPart = SystemTime.QuadPart - Bias.QuadPart;
RtlTimeToTimeFields(&LocalTime,&TimeFields);
lpLocalTime->wYear = TimeFields.Year ;
lpLocalTime->wMonth = TimeFields.Month ;
lpLocalTime->wDayOfWeek = TimeFields.Weekday ;
lpLocalTime->wDay = TimeFields.Day ;
lpLocalTime->wHour = TimeFields.Hour ;
lpLocalTime->wMinute = TimeFields.Minute ;
lpLocalTime->wSecond = TimeFields.Second ;
lpLocalTime->wMilliseconds = TimeFields.Milliseconds;
}
VOID
WINAPI
GetSystemTime(
LPSYSTEMTIME lpSystemTime
)
/*++
Routine Description:
The current system date and time (UTC based) can be returned using
GetSystemTime.
Arguments:
lpSystemTime - Returns the current system date and time:
SYSTEMTIME Structure:
WORD wYear - Returns the current year.
WORD wMonth - Returns the current month with January equal to 1.
WORD wDayOfWeek - Returns the current day of the week where
0=Sunday, 1=Monday...
WORD wDay - Returns the current day of the month.
WORD wHour - Returns the current hour.
WORD wMinute - Returns the current minute within the hour.
WORD wSecond - Returns the current second within the minute.
WORD wMilliseconds - Returns the current millisecond within the
second.
Return Value:
None.
--*/
{
LARGE_INTEGER SystemTime;
TIME_FIELDS TimeFields;
//
// Read system time from shared region.
//
do {
SystemTime.HighPart = USER_SHARED_DATA->SystemTime.High1Time;
SystemTime.LowPart = USER_SHARED_DATA->SystemTime.LowPart;
} while (SystemTime.HighPart != USER_SHARED_DATA->SystemTime.High2Time);
RtlTimeToTimeFields(&SystemTime,&TimeFields);
lpSystemTime->wYear = TimeFields.Year ;
lpSystemTime->wMonth = TimeFields.Month ;
lpSystemTime->wDayOfWeek = TimeFields.Weekday ;
lpSystemTime->wDay = TimeFields.Day ;
lpSystemTime->wHour = TimeFields.Hour ;
lpSystemTime->wMinute = TimeFields.Minute ;
lpSystemTime->wSecond = TimeFields.Second ;
lpSystemTime->wMilliseconds = TimeFields.Milliseconds;
}
VOID
WINAPI
GetSystemTimeAsFileTime(
LPFILETIME lpSystemTimeAsFileTime
)
/*++
Routine Description:
The current system date and time (UTC based) can be returned using
GetSystemTimeAsFileTime.
Arguments:
lpSystemTimeAsFileTime - Returns the current system date and time formatted as
a FILETIME structure
Return Value:
None.
--*/
{
LARGE_INTEGER SystemTime;
//
// Read system time from shared region.
//
do {
SystemTime.HighPart = USER_SHARED_DATA->SystemTime.High1Time;
SystemTime.LowPart = USER_SHARED_DATA->SystemTime.LowPart;
} while (SystemTime.HighPart != USER_SHARED_DATA->SystemTime.High2Time);
lpSystemTimeAsFileTime->dwLowDateTime = SystemTime.LowPart;
lpSystemTimeAsFileTime->dwHighDateTime = SystemTime.HighPart;
}
BOOL
WINAPI
SetSystemTime(
CONST SYSTEMTIME *lpSystemTime
)
/*++
Routine Description:
The current UTC based system date and time can be set using
SetSystemTime.
Arguments:
lpSystemTime - Supplies the date and time to set. The wDayOfWeek field
is ignored.
Return Value:
TRUE - The current system date and time was set.
FALSE/NULL - The operation failed. Extended error status is available
using GetLastError.
--*/
{
LARGE_INTEGER SystemTime;
TIME_FIELDS TimeFields;
BOOLEAN ReturnValue;
PVOID State;
NTSTATUS Status;
ReturnValue = TRUE;
TimeFields.Year = lpSystemTime->wYear ;
TimeFields.Month = lpSystemTime->wMonth ;
TimeFields.Day = lpSystemTime->wDay ;
TimeFields.Hour = lpSystemTime->wHour ;
TimeFields.Minute = lpSystemTime->wMinute ;
TimeFields.Second = lpSystemTime->wSecond ;
TimeFields.Milliseconds = lpSystemTime->wMilliseconds;
if ( !RtlTimeFieldsToTime(&TimeFields,&SystemTime) ) {
Status = STATUS_INVALID_PARAMETER;
ReturnValue = FALSE;
}
else {
Status = BasepAcquirePrivilegeEx( SE_SYSTEMTIME_PRIVILEGE, &State );
if ( NT_SUCCESS(Status) ) {
Status = NtSetSystemTime(&SystemTime,NULL);
BasepReleasePrivilege( State );
}
if ( !NT_SUCCESS(Status) ) {
ReturnValue = FALSE;
}
}
if ( !ReturnValue ) {
BaseSetLastNTError(Status);
}
return ReturnValue;
}
BOOL
WINAPI
SetLocalTime(
CONST SYSTEMTIME *lpLocalTime
)
/*++
Routine Description:
The current local system date and time can be set using
SetLocalTime.
Arguments:
lpSystemTime - Supplies the date and time to set. The wDayOfWeek field
is ignored.
Return Value:
TRUE - The current system date and time was set.
FALSE/NULL - The operation failed. Extended error status is available
using GetLastError.
--*/
{
LARGE_INTEGER SystemTime;
LARGE_INTEGER LocalTime;
TIME_FIELDS TimeFields;
BOOLEAN ReturnValue;
PVOID State;
NTSTATUS Status;
LARGE_INTEGER Bias;
volatile KSYSTEM_TIME *pRealBias;
//
// Read time zone bias from shared region.
// If it's terminal server session use client bias.
if(IsTimeZoneRedirectionEnabled()) {
pRealBias=&(BaseStaticServerData->ktTermsrvClientBias);
} else {
pRealBias=&(USER_SHARED_DATA->TimeZoneBias);
}
do {
Bias.HighPart = pRealBias->High1Time;
Bias.LowPart = pRealBias->LowPart;
} while (Bias.HighPart != pRealBias->High2Time);
ReturnValue = TRUE;
TimeFields.Year = lpLocalTime->wYear ;
TimeFields.Month = lpLocalTime->wMonth ;
TimeFields.Day = lpLocalTime->wDay ;
TimeFields.Hour = lpLocalTime->wHour ;
TimeFields.Minute = lpLocalTime->wMinute ;
TimeFields.Second = lpLocalTime->wSecond ;
TimeFields.Milliseconds = lpLocalTime->wMilliseconds;
if ( !RtlTimeFieldsToTime(&TimeFields,&LocalTime) ) {
Status = STATUS_INVALID_PARAMETER;
ReturnValue = FALSE;
}
else {
SystemTime.QuadPart = LocalTime.QuadPart + Bias.QuadPart;
Status = BasepAcquirePrivilegeEx( SE_SYSTEMTIME_PRIVILEGE, &State );
if ( NT_SUCCESS(Status) ) {
Status = NtSetSystemTime(&SystemTime,NULL);
BasepReleasePrivilege( State );
if ( !NT_SUCCESS(Status) ) {
ReturnValue = FALSE;
}
}
else {
ReturnValue = FALSE;
}
}
if ( !ReturnValue ) {
BaseSetLastNTError(Status);
}
return ReturnValue;
}
DWORD
GetTickCount(
VOID
)
/*++
Routine Description:
Win32 systems implement a free-running millisecond counter. The
value of this counter can be read using GetTickCount.
Arguments:
None.
Return Value:
This function returns the number of milliseconds that have elapsed
since the system was started. If the system has been running for
a long time, it is possible that the count will repeat. The value of
the counter is accurate within 55 milliseconds.
--*/
{
return (DWORD)NtGetTickCount();
}
BOOL
APIENTRY
FileTimeToSystemTime(
CONST FILETIME *lpFileTime,
LPSYSTEMTIME lpSystemTime
)
/*++
Routine Description:
This functions converts a 64-bit file time value to a time in system
time format.
Arguments:
lpFileTime - Supplies the 64-bit file time to convert to the system
date and time format.
lpSystemTime - Returns the converted value of the 64-bit file time.
Return Value:
TRUE - The 64-bit file time was successfully converted.
FALSE - The operation failed. Extended error status is available
using GetLastError.
--*/
{
LARGE_INTEGER FileTime;
TIME_FIELDS TimeFields;
FileTime.LowPart = lpFileTime->dwLowDateTime;
FileTime.HighPart = lpFileTime->dwHighDateTime;
if ( FileTime.QuadPart < 0 ) {
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
RtlTimeToTimeFields(&FileTime, &TimeFields);
lpSystemTime->wYear = TimeFields.Year ;
lpSystemTime->wMonth = TimeFields.Month ;
lpSystemTime->wDay = TimeFields.Day ;
lpSystemTime->wDayOfWeek = TimeFields.Weekday ;
lpSystemTime->wHour = TimeFields.Hour ;
lpSystemTime->wMinute = TimeFields.Minute ;
lpSystemTime->wSecond = TimeFields.Second ;
lpSystemTime->wMilliseconds = TimeFields.Milliseconds;
return TRUE;
}
BOOL
APIENTRY
SystemTimeToFileTime(
CONST SYSTEMTIME *lpSystemTime,
LPFILETIME lpFileTime
)
/*++
Routine Description:
This functions converts a system time value into a 64-bit file time.
Arguments:
lpSystemTime - Supplies the time that is to be converted into
the 64-bit file time format. The wDayOfWeek field is ignored.
lpFileTime - Returns the 64-bit file time representation of
lpSystemTime.
Return Value:
TRUE - The time was successfully converted.
FALSE - The operation failed. Extended error status is available
using GetLastError.
--*/
{
TIME_FIELDS TimeFields;
LARGE_INTEGER FileTime;
TimeFields.Year = lpSystemTime->wYear ;
TimeFields.Month = lpSystemTime->wMonth ;
TimeFields.Day = lpSystemTime->wDay ;
TimeFields.Hour = lpSystemTime->wHour ;
TimeFields.Minute = lpSystemTime->wMinute ;
TimeFields.Second = lpSystemTime->wSecond ;
TimeFields.Milliseconds = lpSystemTime->wMilliseconds;
if ( !RtlTimeFieldsToTime(&TimeFields,&FileTime)) {
BaseSetLastNTError(STATUS_INVALID_PARAMETER);
return FALSE;
}
else {
lpFileTime->dwLowDateTime = FileTime.LowPart;
lpFileTime->dwHighDateTime = FileTime.HighPart;
return TRUE;
}
}
BOOL
WINAPI
FileTimeToLocalFileTime(
CONST FILETIME *lpFileTime,
LPFILETIME lpLocalFileTime
)
/*++
Routine Description:
This functions converts a UTC based file time to a local file time.
Arguments:
lpFileTime - Supplies the UTC based file time that is to be
converted into a local file time
lpLocalFileTime - Returns the 64-bit local file time representation of
lpFileTime.
Return Value:
TRUE - The time was successfully converted.
FALSE - The operation failed. Extended error status is available
using GetLastError.
--*/
{
LARGE_INTEGER FileTime;
LARGE_INTEGER LocalFileTime;
LARGE_INTEGER Bias;
volatile KSYSTEM_TIME *pRealBias;
//
// Read time zone bias from shared region.
// If it's terminal server session use client bias.
if(IsTimeZoneRedirectionEnabled()) {
pRealBias=&(BaseStaticServerData->ktTermsrvClientBias);
} else {
pRealBias=&(USER_SHARED_DATA->TimeZoneBias);
}
do {
Bias.HighPart = pRealBias->High1Time;
Bias.LowPart = pRealBias->LowPart;
} while (Bias.HighPart != pRealBias->High2Time);
FileTime.LowPart = lpFileTime->dwLowDateTime;
FileTime.HighPart = lpFileTime->dwHighDateTime;
LocalFileTime.QuadPart = FileTime.QuadPart - Bias.QuadPart;
lpLocalFileTime->dwLowDateTime = LocalFileTime.LowPart;
lpLocalFileTime->dwHighDateTime = LocalFileTime.HighPart;
return TRUE;
}
BOOL
WINAPI
LocalFileTimeToFileTime(
CONST FILETIME *lpLocalFileTime,
LPFILETIME lpFileTime
)
/*++
Routine Description:
This functions converts a local file time to a UTC based file time.
Arguments:
lpLocalFileTime - Supplies the local file time that is to be
converted into a UTC based file time
lpFileTime - Returns the 64-bit UTC based file time representation of
lpLocalFileTime.
Return Value:
TRUE - The time was successfully converted.
FALSE - The operation failed. Extended error status is available
using GetLastError.
--*/
{
LARGE_INTEGER FileTime;
LARGE_INTEGER LocalFileTime;
LARGE_INTEGER Bias;
volatile KSYSTEM_TIME *pRealBias;
//
// Read time zone bias from shared region.
// If it's terminal server session use client bias.
if(IsTimeZoneRedirectionEnabled()) {
pRealBias=&(BaseStaticServerData->ktTermsrvClientBias);
} else {
pRealBias=&(USER_SHARED_DATA->TimeZoneBias);
}
do {
Bias.HighPart = pRealBias->High1Time;
Bias.LowPart = pRealBias->LowPart;
} while (Bias.HighPart != pRealBias->High2Time);
LocalFileTime.LowPart = lpLocalFileTime->dwLowDateTime;
LocalFileTime.HighPart = lpLocalFileTime->dwHighDateTime;
FileTime.QuadPart = LocalFileTime.QuadPart + Bias.QuadPart;
lpFileTime->dwLowDateTime = FileTime.LowPart;
lpFileTime->dwHighDateTime = FileTime.HighPart;
return TRUE;
}
#define AlmostTwoSeconds (2*1000*1000*10 - 1)
BOOL
APIENTRY
FileTimeToDosDateTime(
CONST FILETIME *lpFileTime,
LPWORD lpFatDate,
LPWORD lpFatTime
)
/*++
Routine Description:
This function converts a 64-bit file time into DOS date and time value
which is represented as two 16-bit unsigned integers.
Since the DOS date format can only represent dates between 1/1/80 and
12/31/2107, this conversion can fail if the input file time is outside
of this range.
Arguments:
lpFileTime - Supplies the 64-bit file time to convert to DOS date and
time format.
lpFatDate - Returns the 16-bit DOS representation of date.
lpFatTime - Returns the 16-bit DOS representation of time.
Return Value:
TRUE - The file time was successfully converted.
FALSE - The operation failed. Extended error status is available
using GetLastError.
--*/
{
TIME_FIELDS TimeFields;
LARGE_INTEGER FileTime;
FileTime.LowPart = lpFileTime->dwLowDateTime;
FileTime.HighPart = lpFileTime->dwHighDateTime;
FileTime.QuadPart = FileTime.QuadPart + (LONGLONG)AlmostTwoSeconds;
if ( FileTime.QuadPart < 0 ) {
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
RtlTimeToTimeFields(&FileTime, &TimeFields);
if (TimeFields.Year < 1980 || TimeFields.Year > 2107) {
BaseSetLastNTError(STATUS_INVALID_PARAMETER);
return FALSE;
}
*lpFatDate = (WORD)( ((USHORT)(TimeFields.Year-(CSHORT)1980) << 9) |
((USHORT)TimeFields.Month << 5) |
(USHORT)TimeFields.Day
);
*lpFatTime = (WORD)( ((USHORT)TimeFields.Hour << 11) |
((USHORT)TimeFields.Minute << 5) |
((USHORT)TimeFields.Second >> 1)
);
return TRUE;
}
BOOL
APIENTRY
DosDateTimeToFileTime(
WORD wFatDate,
WORD wFatTime,
LPFILETIME lpFileTime
)
/*++
Routine Description:
This function converts a DOS date and time value, which is
represented as two 16-bit unsigned integers, into a 64-bit file
time.
Arguments:
lpFatDate - Supplies the 16-bit DOS representation of date.
lpFatTime - Supplies the 16-bit DOS representation of time.
lpFileTime - Returns the 64-bit file time converted from the DOS
date and time format.
Return Value:
TRUE - The Dos date and time were successfully converted.
FALSE - The operation failed. Extended error status is available
using GetLastError.
--*/
{
TIME_FIELDS TimeFields;
LARGE_INTEGER FileTime;
TimeFields.Year = (CSHORT)((wFatDate & 0xFE00) >> 9)+(CSHORT)1980;
TimeFields.Month = (CSHORT)((wFatDate & 0x01E0) >> 5);
TimeFields.Day = (CSHORT)((wFatDate & 0x001F) >> 0);
TimeFields.Hour = (CSHORT)((wFatTime & 0xF800) >> 11);
TimeFields.Minute = (CSHORT)((wFatTime & 0x07E0) >> 5);
TimeFields.Second = (CSHORT)((wFatTime & 0x001F) << 1);
TimeFields.Milliseconds = 0;
if (RtlTimeFieldsToTime(&TimeFields,&FileTime)) {
lpFileTime->dwLowDateTime = FileTime.LowPart;
lpFileTime->dwHighDateTime = FileTime.HighPart;
return TRUE;
}
else {
BaseSetLastNTError(STATUS_INVALID_PARAMETER);
return FALSE;
}
}
LONG
APIENTRY
CompareFileTime(
CONST FILETIME *lpFileTime1,
CONST FILETIME *lpFileTime2
)
/*++
Routine Description:
This function compares two 64-bit file times.
Arguments:
lpFileTime1 - pointer to a 64-bit file time.
lpFileTime2 - pointer to a 64-bit file time.
Return Value:
-1 - *lpFileTime1 < *lpFileTime2
0 - *lpFileTime1 == *lpFileTime2
+1 - *lpFileTime1 > *lpFileTime2
--*/
{
ULARGE_INTEGER FileTime1;
ULARGE_INTEGER FileTime2;
FileTime1.LowPart = lpFileTime1->dwLowDateTime;
FileTime1.HighPart = lpFileTime1->dwHighDateTime;
FileTime2.LowPart = lpFileTime2->dwLowDateTime;
FileTime2.HighPart = lpFileTime2->dwHighDateTime;
if (FileTime1.QuadPart < FileTime2.QuadPart) {
return( -1 );
}
else
if (FileTime1.QuadPart > FileTime2.QuadPart) {
return( 1 );
}
else {
return( 0 );
}
}
DWORD
WINAPI
GetTimeZoneInformation(
LPTIME_ZONE_INFORMATION lpTimeZoneInformation
)
/*++
Routine Description:
This function allows an application to get the current timezone
parameters These parameters control the Universal time to Local time
translations.
All UTC time to Local time translations are based on the following
formula:
UTC = LocalTime + Bias
The return value of this function is the systems best guess of
the current time zone parameters. This is one of:
- Unknown
- Standard Time
- Daylight Savings Time
If SetTimeZoneInformation was called without the transition date
information, Unknown is returned, but the currect bias is used for
local time translation. Otherwise, the system will correctly pick
either daylight savings time or standard time.
The information returned by this API is identical to the information
stored in the last successful call to SetTimeZoneInformation. The
exception is the Bias field returns the current Bias value in
Arguments:
lpTimeZoneInformation - Supplies the address of the time zone
information structure.
Return Value:
TIME_ZONE_ID_UNKNOWN - The system can not determine the current
timezone. This is usually due to a previous call to
SetTimeZoneInformation where only the Bias was supplied and no
transition dates were supplied.
TIME_ZONE_ID_STANDARD - The system is operating in the range covered
by StandardDate.
TIME_ZONE_ID_DAYLIGHT - The system is operating in the range covered
by DaylightDate.
0xffffffff - The operation failed. Extended error status is
available using GetLastError.
--*/
{
RTL_TIME_ZONE_INFORMATION tzi;
NTSTATUS Status;
//
// get the timezone data from the system
// If it's terminal server session use client time zone
if(IsTimeZoneRedirectionEnabled()) {
*lpTimeZoneInformation = BaseStaticServerData->tziTermsrvClientTimeZone;
return BaseStaticServerData->TermsrvClientTimeZoneId;
} else {
Status = NtQuerySystemInformation(
SystemCurrentTimeZoneInformation,
&tzi,
sizeof(tzi),
NULL
);
if ( !NT_SUCCESS(Status) ) {
BaseSetLastNTError(Status);
return 0xffffffff;
}
lpTimeZoneInformation->Bias = tzi.Bias;
lpTimeZoneInformation->StandardBias = tzi.StandardBias;
lpTimeZoneInformation->DaylightBias = tzi.DaylightBias;
RtlCopyMemory(&lpTimeZoneInformation->StandardName,&tzi.StandardName,sizeof(tzi.StandardName));
RtlCopyMemory(&lpTimeZoneInformation->DaylightName,&tzi.DaylightName,sizeof(tzi.DaylightName));
lpTimeZoneInformation->StandardDate.wYear = tzi.StandardStart.Year ;
lpTimeZoneInformation->StandardDate.wMonth = tzi.StandardStart.Month ;
lpTimeZoneInformation->StandardDate.wDayOfWeek = tzi.StandardStart.Weekday ;
lpTimeZoneInformation->StandardDate.wDay = tzi.StandardStart.Day ;
lpTimeZoneInformation->StandardDate.wHour = tzi.StandardStart.Hour ;
lpTimeZoneInformation->StandardDate.wMinute = tzi.StandardStart.Minute ;
lpTimeZoneInformation->StandardDate.wSecond = tzi.StandardStart.Second ;
lpTimeZoneInformation->StandardDate.wMilliseconds = tzi.StandardStart.Milliseconds;
lpTimeZoneInformation->DaylightDate.wYear = tzi.DaylightStart.Year ;
lpTimeZoneInformation->DaylightDate.wMonth = tzi.DaylightStart.Month ;
lpTimeZoneInformation->DaylightDate.wDayOfWeek = tzi.DaylightStart.Weekday ;
lpTimeZoneInformation->DaylightDate.wDay = tzi.DaylightStart.Day ;
lpTimeZoneInformation->DaylightDate.wHour = tzi.DaylightStart.Hour ;
lpTimeZoneInformation->DaylightDate.wMinute = tzi.DaylightStart.Minute ;
lpTimeZoneInformation->DaylightDate.wSecond = tzi.DaylightStart.Second ;
lpTimeZoneInformation->DaylightDate.wMilliseconds = tzi.DaylightStart.Milliseconds;
return USER_SHARED_DATA->TimeZoneId;
}
}
BOOL
WINAPI
SetTimeZoneInformation(
CONST TIME_ZONE_INFORMATION *lpTimeZoneInformation
)
/*++
Routine Description:
This function allows an application to set timezone parameters into
their system. These parameters control the Universal time to Local
time translations.
All UTC time to Local time translations are based on the following
formula:
UTC = LocalTime + Bias
This API allows the caller to program the current time zone bias,
and optionally set up the system to automatically sense daylight
savings time and standard time transitions.
The timezone bias information is controlled by the
TIME_ZONE_INFORMATION structure.
Bias - Supplies the current bias in minutes for local time
translation on this machine where LocalTime + Bias = UTC. This
is a required filed of this structure.
StandardName - Supplies an optional abbreviation string associated
with standard time on this system. This string is uniterpreted
and is supplied and used only by callers of this API and of
GetTimeZoneInformation.
StandardDate - Supplies an optional date and time (UTC) that
describes the transition into standard time. A value of 0 in
the wMonth field tells the system that StandardDate is not
specified. If this field is specified, then DaylightDate must
also be specified. Additionally, local time translations done
during the StandardTime range will be done relative to the
supplied StandardBias value (added to Bias).
This field supports two date formats. Absolute form specifies and
exact date and time when standard time begins. In this form, the
wYear, wMonth, wDay, wHour, wMinute, wSecond, and wMilliseconds
of the SYSTEMTIME structure are used to specify an exact date.
Day-in-month time is specified by setting wYear to 0, setting
wDayOfWeek to an appropriate weekday, and using wDay in the
range of 1-5 to select the correct day in the month. Using this
notation, the first sunday in april may be specified as can be
the last thursday in october (5 is equal to "the last").
StandardBias - Supplies an optional bias value to be used during
local time translations that occur during Standard Time. This
field is ignored if StandardDate is not supplied.
This bias value
is added to the Bias field to form the Bias used during standard
time. In most time zones, the value of this field is zero.
DaylightName - Supplies an optional abbreviation string associated
with daylight savings time on this system. This string is
uniterpreted and is supplied and used only by callers of this
API and of GetTimeZoneInformation.
DaylightDate - Supplies an optional date and time (UTC) that
describes the transition into daylight savings time. A value of
0 in the wMonth field tells the system that DaylightDate is not
specified. If this field is specified, then StandardDate must
also be specified. Additionally, local time translations done
during the DaylightTime range will be done relative to the
supplied DaylightBias value (added to Bias). The same dat formats
supported by StandardDate are supported ib DaylightDate.
DaylightBias - Supplies an optional bias value to be used during
local time translations that occur during Daylight Savings Time.
This field is ignored if DaylightDate is not supplied. This
bias value is added to the Bias field to form the Bias used
during daylight time. In most time zones, the value of this
field is -60.
Arguments:
lpTimeZoneInformation - Supplies the address of the time zone
information structure.
Return Value:
TRUE - The operation was successful.
FALSE - The operation failed. Extended error status is available
using GetLastError.
--*/
{
RTL_TIME_ZONE_INFORMATION tzi;
NTSTATUS Status;
if(IsTimeZoneRedirectionEnabled()) {
return SetClientTimeZoneInformation(lpTimeZoneInformation);
} else {
tzi.Bias = lpTimeZoneInformation->Bias;
tzi.StandardBias = lpTimeZoneInformation->StandardBias;
tzi.DaylightBias = lpTimeZoneInformation->DaylightBias;
RtlCopyMemory(&tzi.StandardName,&lpTimeZoneInformation->StandardName,sizeof(tzi.StandardName));
RtlCopyMemory(&tzi.DaylightName,&lpTimeZoneInformation->DaylightName,sizeof(tzi.DaylightName));
tzi.StandardStart.Year = lpTimeZoneInformation->StandardDate.wYear ;
tzi.StandardStart.Month = lpTimeZoneInformation->StandardDate.wMonth ;
tzi.StandardStart.Weekday = lpTimeZoneInformation->StandardDate.wDayOfWeek ;
tzi.StandardStart.Day = lpTimeZoneInformation->StandardDate.wDay ;
tzi.StandardStart.Hour = lpTimeZoneInformation->StandardDate.wHour ;
tzi.StandardStart.Minute = lpTimeZoneInformation->StandardDate.wMinute ;
tzi.StandardStart.Second = lpTimeZoneInformation->StandardDate.wSecond ;
tzi.StandardStart.Milliseconds = lpTimeZoneInformation->StandardDate.wMilliseconds;
tzi.DaylightStart.Year = lpTimeZoneInformation->DaylightDate.wYear ;
tzi.DaylightStart.Month = lpTimeZoneInformation->DaylightDate.wMonth ;
tzi.DaylightStart.Weekday = lpTimeZoneInformation->DaylightDate.wDayOfWeek ;
tzi.DaylightStart.Day = lpTimeZoneInformation->DaylightDate.wDay ;
tzi.DaylightStart.Hour = lpTimeZoneInformation->DaylightDate.wHour ;
tzi.DaylightStart.Minute = lpTimeZoneInformation->DaylightDate.wMinute ;
tzi.DaylightStart.Second = lpTimeZoneInformation->DaylightDate.wSecond ;
tzi.DaylightStart.Milliseconds = lpTimeZoneInformation->DaylightDate.wMilliseconds;
Status = RtlSetTimeZoneInformation( &tzi );
if (!NT_SUCCESS( Status )) {
BaseSetLastNTError(Status);
return FALSE;
}
//
// Refresh the system's concept of time
//
NtSetSystemTime(NULL,NULL);
return TRUE;
}
}
BOOL
WINAPI
GetSystemTimeAdjustment(
PDWORD lpTimeAdjustment,
PDWORD lpTimeIncrement,
PBOOL lpTimeAdjustmentDisabled
)
/*++
Routine Description:
This function is used to support algorithms that want to synchronize
the time of day (reported via GetSystemTime and GetLocalTime) with
another time source using a programmed clock adjustment over a
period of time.
To facilitate this, the system computes the time of day by adding a
value to a time of day counter at a periodic interval. This API
allows the caller to obtain the periodic interval (clock interrupt
rate), and the amount added to the time of day with each interrupt.
A boolean value is also returned which indicates whether or not this
time adjustment algorithm is even being used. A value of TRUE
indicates that adjustment is not being used. If this is the case,
the system may attempt to keep the time of day clock in sync using
its own internal mechanisms. This may cause time of day to
periodicly "jump" to the "correct time".
Arguments:
lpTimeAdjustment - Returns the number of 100ns units added to the
time of day counter at each clock interrupt.
lpTimeIncrement - Returns the clock interrupt rate in 100ns units.
lpTimeAdjustmentDisabled - Returns an indicator which specifies
whether or not time adjustment is inabled. A value of TRUE
indicates that periodic adjustment is disabled
(*lpTimeAdjustment == *lpTimeIncrement), AND that the system is
free to serialize time of day using any mechanism it wants.
This may cause periodic time jumps as the system serializes time
of day to the "correct time". A value of false indicates that
programmed time adjustment is being used to serialize the time
of day, and that the system will not interfere with this scheme
and will not attempt to synchronize time of day on its own.
Return Value:
TRUE - The operation was successful.
FALSE - The operation failed. Use GetLastError to obtain detailed
error information.
--*/
{
NTSTATUS Status;
SYSTEM_QUERY_TIME_ADJUST_INFORMATION TimeAdjust;
BOOL b;
Status = NtQuerySystemInformation(
SystemTimeAdjustmentInformation,
&TimeAdjust,
sizeof(TimeAdjust),
NULL
);
if ( !NT_SUCCESS(Status) ) {
BaseSetLastNTError(Status);
b = FALSE;
}
else {
*lpTimeAdjustment = TimeAdjust.TimeAdjustment;
*lpTimeIncrement = TimeAdjust.TimeIncrement;
*lpTimeAdjustmentDisabled = TimeAdjust.Enable;
b = TRUE;
}
return b;
}
BOOL
WINAPI
SetSystemTimeAdjustment(
DWORD dwTimeAdjustment,
BOOL bTimeAdjustmentDisabled
)
/*++
Routine Description:
This function is used to tell the system the parameters it should
use to periodicaly synchronize time of day with some other source.
This API supports two modes of operation.
In the first mode, bTimeAdjustmentDisabled is set to FALSE. At each
clock interrupt, the value of dwTimeAdjustment is added to the time
of day. The clock interrupt rate may be obtained using
GetSystemTimeAdjustment, and looking at the returned value of
lpTimeIncrement.
In the second mode, bTimeAdjustmentDisabled is set to TRUE. At each
clock interrupt, the clock interrupt rate is added to the time of
day. The system may also periodically refresh the time of day using
other internal algorithms. These may produce "jumps" in time.
The application must have system-time privilege (the
SE_SYSTEMTIME_NAME privilege) for this function to succeed. This
privilege is disabled by default. Use the AdjustTokenPrivileges
function to enable the privilege and again to disable it after the
time adjustment has been set.
Arguments:
dwTimeAdjustment - Supplies the value (in 100ns units) that is to be
added to the time of day at each clock interrupt.
bTimeAdjustmentDisabled - Supplies a flag which specifies the time
adjustment mode that the system is to use. A value of TRUE
indicates the the system should synchronize time of day using
its own internal mechanisms. When this is the case, the value
of dwTimeAdjustment is ignored. A value of FALSE indicates that
the application is in control, and that the value specified by
dwTimeAdjustment is to be added to the time of day at each clock
interrupt.
Return Value:
TRUE - The operation was successful.
FALSE - The operation failed. Use GetLastError to obtain detailed
error information.
--*/
{
NTSTATUS Status;
SYSTEM_SET_TIME_ADJUST_INFORMATION TimeAdjust;
BOOL b;
b = TRUE;
TimeAdjust.TimeAdjustment = dwTimeAdjustment;
TimeAdjust.Enable = (BOOLEAN)bTimeAdjustmentDisabled;
Status = NtSetSystemInformation(
SystemTimeAdjustmentInformation,
&TimeAdjust,
sizeof(TimeAdjust)
);
if ( !NT_SUCCESS(Status) ) {
BaseSetLastNTError(Status);
b = FALSE;
}
return b;
}
BOOL
WINAPI
SystemTimeToTzSpecificLocalTime(
LPTIME_ZONE_INFORMATION lpTimeZoneInformation,
LPSYSTEMTIME lpUniversalTime,
LPSYSTEMTIME lpLocalTime
)
{
TIME_ZONE_INFORMATION TziData;
LPTIME_ZONE_INFORMATION Tzi;
RTL_TIME_ZONE_INFORMATION tzi;
LARGE_INTEGER TimeZoneBias;
LARGE_INTEGER NewTimeZoneBias;
LARGE_INTEGER LocalCustomBias;
LARGE_INTEGER StandardTime;
LARGE_INTEGER DaylightTime;
LARGE_INTEGER UtcStandardTime;
LARGE_INTEGER UtcDaylightTime;
LARGE_INTEGER CurrentUniversalTime;
LARGE_INTEGER ComputedLocalTime;
ULONG CurrentTimeZoneId = 0xffffffff;
//
// Get the timezone information into a useful format
//
if ( !ARGUMENT_PRESENT(lpTimeZoneInformation) ) {
//
// Convert universal time to local time using current timezone info
//
if (GetTimeZoneInformation(&TziData) == TIME_ZONE_ID_INVALID) {
return FALSE;
}
Tzi = &TziData;
} else {
Tzi = lpTimeZoneInformation;
}
tzi.Bias = Tzi->Bias;
tzi.StandardBias = Tzi->StandardBias;
tzi.DaylightBias = Tzi->DaylightBias;
RtlCopyMemory(&tzi.StandardName,&Tzi->StandardName,sizeof(tzi.StandardName));
RtlCopyMemory(&tzi.DaylightName,&Tzi->DaylightName,sizeof(tzi.DaylightName));
tzi.StandardStart.Year = Tzi->StandardDate.wYear ;
tzi.StandardStart.Month = Tzi->StandardDate.wMonth ;
tzi.StandardStart.Weekday = Tzi->StandardDate.wDayOfWeek ;
tzi.StandardStart.Day = Tzi->StandardDate.wDay ;
tzi.StandardStart.Hour = Tzi->StandardDate.wHour ;
tzi.StandardStart.Minute = Tzi->StandardDate.wMinute ;
tzi.StandardStart.Second = Tzi->StandardDate.wSecond ;
tzi.StandardStart.Milliseconds = Tzi->StandardDate.wMilliseconds;
tzi.DaylightStart.Year = Tzi->DaylightDate.wYear ;
tzi.DaylightStart.Month = Tzi->DaylightDate.wMonth ;
tzi.DaylightStart.Weekday = Tzi->DaylightDate.wDayOfWeek ;
tzi.DaylightStart.Day = Tzi->DaylightDate.wDay ;
tzi.DaylightStart.Hour = Tzi->DaylightDate.wHour ;
tzi.DaylightStart.Minute = Tzi->DaylightDate.wMinute ;
tzi.DaylightStart.Second = Tzi->DaylightDate.wSecond ;
tzi.DaylightStart.Milliseconds = Tzi->DaylightDate.wMilliseconds;
//
// convert the input universal time to NT style time
//
if ( !SystemTimeToFileTime(lpUniversalTime,(LPFILETIME)&CurrentUniversalTime) ) {
return FALSE;
}
//
// Get the new timezone bias
//
NewTimeZoneBias.QuadPart = Int32x32To64(tzi.Bias*60, 10000000);
//
// Now see if we have stored cutover times
//
if ( tzi.StandardStart.Month && tzi.DaylightStart.Month ) {
//
// We have timezone cutover information. Compute the
// cutover dates and compute what our current bias
// is
//
if ( !RtlCutoverTimeToSystemTime(
&tzi.StandardStart,
&StandardTime,
&CurrentUniversalTime,
TRUE
) ) {
BaseSetLastNTError(STATUS_INVALID_PARAMETER);
return FALSE;
}
if ( !RtlCutoverTimeToSystemTime(
&tzi.DaylightStart,
&DaylightTime,
&CurrentUniversalTime,
TRUE
) ) {
BaseSetLastNTError(STATUS_INVALID_PARAMETER);
return FALSE;
}
//
// Convert standard time and daylight time to utc
//
LocalCustomBias.QuadPart = Int32x32To64(tzi.StandardBias*60, 10000000);
TimeZoneBias.QuadPart = NewTimeZoneBias.QuadPart + LocalCustomBias.QuadPart;
UtcDaylightTime.QuadPart = DaylightTime.QuadPart + TimeZoneBias.QuadPart;
LocalCustomBias.QuadPart = Int32x32To64(tzi.DaylightBias*60, 10000000);
TimeZoneBias.QuadPart = NewTimeZoneBias.QuadPart + LocalCustomBias.QuadPart;
UtcStandardTime.QuadPart = StandardTime.QuadPart + TimeZoneBias.QuadPart;
//
// If daylight < standard, then time >= daylight and
// less than standard is daylight
//
if ( UtcDaylightTime.QuadPart < UtcStandardTime.QuadPart ) {
//
// If today is >= DaylightTime and < StandardTime, then
// We are in daylight savings time
//
if ( (CurrentUniversalTime.QuadPart >= UtcDaylightTime.QuadPart) &&
(CurrentUniversalTime.QuadPart < UtcStandardTime.QuadPart) ) {
CurrentTimeZoneId = TIME_ZONE_ID_DAYLIGHT;
}
else {
CurrentTimeZoneId = TIME_ZONE_ID_STANDARD;
}
}
else {
//
// If today is >= StandardTime and < DaylightTime, then
// We are in standard time
//
if ( (CurrentUniversalTime.QuadPart >= UtcStandardTime.QuadPart ) &&
(CurrentUniversalTime.QuadPart < UtcDaylightTime.QuadPart ) ) {
CurrentTimeZoneId = TIME_ZONE_ID_STANDARD;
}
else {
CurrentTimeZoneId = TIME_ZONE_ID_DAYLIGHT;
}
}
//
// At this point, we know our current timezone and the
// Universal time of the next cutover.
//
LocalCustomBias.QuadPart = Int32x32To64(
CurrentTimeZoneId == TIME_ZONE_ID_DAYLIGHT ?
tzi.DaylightBias*60 :
tzi.StandardBias*60, // Bias in seconds
10000000
);
TimeZoneBias.QuadPart = NewTimeZoneBias.QuadPart + LocalCustomBias.QuadPart;
}
else {
TimeZoneBias = NewTimeZoneBias;
}
ComputedLocalTime.QuadPart = CurrentUniversalTime.QuadPart - TimeZoneBias.QuadPart;
if ( !FileTimeToSystemTime((LPFILETIME)&ComputedLocalTime,lpLocalTime) ) {
return FALSE;
}
return TRUE;
}
BOOL
WINAPI
TzSpecificLocalTimeToSystemTime(
LPTIME_ZONE_INFORMATION lpTimeZoneInformation,
LPSYSTEMTIME lpLocalTime,
LPSYSTEMTIME lpUniversalTime
)
{
TIME_ZONE_INFORMATION TziData;
LPTIME_ZONE_INFORMATION Tzi;
RTL_TIME_ZONE_INFORMATION tzi;
LARGE_INTEGER TimeZoneBias;
LARGE_INTEGER NewTimeZoneBias;
LARGE_INTEGER LocalCustomBias;
LARGE_INTEGER StandardTime;
LARGE_INTEGER DaylightTime;
LARGE_INTEGER CurrentLocalTime;
LARGE_INTEGER ComputedUniversalTime;
ULONG CurrentTimeZoneId = 0xffffffff;
//
// Get the timezone information into a useful format
//
if ( !ARGUMENT_PRESENT(lpTimeZoneInformation) ) {
//
// Convert universal time to local time using current timezone info
//
if (GetTimeZoneInformation(&TziData) == TIME_ZONE_ID_INVALID) {
return FALSE;
}
Tzi = &TziData;
}
else {
Tzi = lpTimeZoneInformation;
}
tzi.Bias = Tzi->Bias;
tzi.StandardBias = Tzi->StandardBias;
tzi.DaylightBias = Tzi->DaylightBias;
RtlCopyMemory(&tzi.StandardName,&Tzi->StandardName,sizeof(tzi.StandardName));
RtlCopyMemory(&tzi.DaylightName,&Tzi->DaylightName,sizeof(tzi.DaylightName));
tzi.StandardStart.Year = Tzi->StandardDate.wYear ;
tzi.StandardStart.Month = Tzi->StandardDate.wMonth ;
tzi.StandardStart.Weekday = Tzi->StandardDate.wDayOfWeek ;
tzi.StandardStart.Day = Tzi->StandardDate.wDay ;
tzi.StandardStart.Hour = Tzi->StandardDate.wHour ;
tzi.StandardStart.Minute = Tzi->StandardDate.wMinute ;
tzi.StandardStart.Second = Tzi->StandardDate.wSecond ;
tzi.StandardStart.Milliseconds = Tzi->StandardDate.wMilliseconds;
tzi.DaylightStart.Year = Tzi->DaylightDate.wYear ;
tzi.DaylightStart.Month = Tzi->DaylightDate.wMonth ;
tzi.DaylightStart.Weekday = Tzi->DaylightDate.wDayOfWeek ;
tzi.DaylightStart.Day = Tzi->DaylightDate.wDay ;
tzi.DaylightStart.Hour = Tzi->DaylightDate.wHour ;
tzi.DaylightStart.Minute = Tzi->DaylightDate.wMinute ;
tzi.DaylightStart.Second = Tzi->DaylightDate.wSecond ;
tzi.DaylightStart.Milliseconds = Tzi->DaylightDate.wMilliseconds;
//
// convert the input local time to NT style time
//
if ( !SystemTimeToFileTime(lpLocalTime,(LPFILETIME)&CurrentLocalTime) ) {
return FALSE;
}
//
// Get the new timezone bias
//
NewTimeZoneBias.QuadPart = Int32x32To64(tzi.Bias*60, 10000000);
//
// Now see if we have stored cutover times
//
if ( tzi.StandardStart.Month && tzi.DaylightStart.Month ) {
//
// We have timezone cutover information. Compute the
// cutover dates and compute what our current bias
// is
//
if ( !RtlCutoverTimeToSystemTime(
&tzi.StandardStart,
&StandardTime,
&CurrentLocalTime,
TRUE
) ) {
BaseSetLastNTError(STATUS_INVALID_PARAMETER);
return FALSE;
}
if ( !RtlCutoverTimeToSystemTime(
&tzi.DaylightStart,
&DaylightTime,
&CurrentLocalTime,
TRUE
) ) {
BaseSetLastNTError(STATUS_INVALID_PARAMETER);
return FALSE;
}
//
// If daylight < standard, then time >= daylight and
// less than standard is daylight
//
if ( DaylightTime.QuadPart < StandardTime.QuadPart ) {
//
// If today is >= DaylightTime and < StandardTime, then
// We are in daylight savings time
//
if ( (CurrentLocalTime.QuadPart >= DaylightTime.QuadPart) &&
(CurrentLocalTime.QuadPart < StandardTime.QuadPart) ) {
CurrentTimeZoneId = TIME_ZONE_ID_DAYLIGHT;
}
else {
CurrentTimeZoneId = TIME_ZONE_ID_STANDARD;
}
}
else {
//
// If today is >= StandardTime and < DaylightTime, then
// We are in standard time
//
if ( (CurrentLocalTime.QuadPart >= StandardTime.QuadPart ) &&
(CurrentLocalTime.QuadPart < DaylightTime.QuadPart ) ) {
CurrentTimeZoneId = TIME_ZONE_ID_STANDARD;
}
else {
CurrentTimeZoneId = TIME_ZONE_ID_DAYLIGHT;
}
}
//
// At this point, we know our current timezone and the
// local time of the next cutover.
//
LocalCustomBias.QuadPart = Int32x32To64(
CurrentTimeZoneId == TIME_ZONE_ID_DAYLIGHT ?
tzi.DaylightBias*60 :
tzi.StandardBias*60, // Bias in seconds
10000000
);
TimeZoneBias.QuadPart = NewTimeZoneBias.QuadPart + LocalCustomBias.QuadPart;
}
else {
TimeZoneBias = NewTimeZoneBias;
}
ComputedUniversalTime.QuadPart = CurrentLocalTime.QuadPart + TimeZoneBias.QuadPart;
if ( !FileTimeToSystemTime((LPFILETIME)&ComputedUniversalTime,lpUniversalTime) ) {
return FALSE;
}
return TRUE;
}
BOOL
WINAPI
SetClientTimeZoneInformation(
IN CONST TIME_ZONE_INFORMATION *ptzi
)
/*++
Routine Description:
Sets information in global structures used
to calculate local time in TS session.
Arguments:
IN CONST TIME_ZONE_INFORMATION *ptzi
Return Value:
TRUE - The operation was successful.
FALSE - The operation failed. Use GetLastError to obtain detailed
error information.
Client time zone information may become invalid during this call
In this case we will use time zone information from server
--*/
{
NTSTATUS Status;
BASE_API_MSG m;
PBASE_SET_TERMSRVCLIENTTIMEZONE c = &m.u.SetTermsrvClientTimeZone;
c->fFirstChunk=TRUE; //this meanes that this is only first portion of data
//we have to cut it ito two pieces because of
//message size restrictions (100 bytes)
c->Bias=ptzi->Bias;
RtlCopyMemory(&c->Name,&ptzi->StandardName,sizeof(ptzi->StandardName));
c->Date=ptzi->StandardDate;
c->Bias1=ptzi->StandardBias;
#if defined(BUILD_WOW6432)
Status = CsrBasepSetClientTimeZoneInformation(c);
#else
Status = CsrClientCallServer((PCSR_API_MSG)&m, NULL,
CSR_MAKE_API_NUMBER(BASESRV_SERVERDLL_INDEX,
BasepSetTermsrvClientTimeZone),
sizeof( *c ));
#endif
if ( !NT_SUCCESS( Status ) ) {
SetLastError( RtlNtStatusToDosError( Status ) );
return( FALSE );
}
c->fFirstChunk=FALSE; //this is a second and last portion of data
RtlCopyMemory(&c->Name,&ptzi->DaylightName,sizeof(ptzi->DaylightName));
c->Date=ptzi->DaylightDate;
c->Bias1=ptzi->DaylightBias;
c->TimeZoneId=CalcClientTimeZoneIdAndBias(ptzi,&c->RealBias);
#if defined(BUILD_WOW6432)
Status = CsrBasepSetClientTimeZoneInformation(c);
#else
Status = CsrClientCallServer((PCSR_API_MSG)&m, NULL,
CSR_MAKE_API_NUMBER(BASESRV_SERVERDLL_INDEX,
BasepSetTermsrvClientTimeZone),
sizeof( *c ));
#endif
if ( !NT_SUCCESS( Status ) ) {
SetLastError( RtlNtStatusToDosError( Status ) );
return( FALSE );
}
return( TRUE );
}
ULONG
CalcClientTimeZoneIdAndBias(
IN CONST TIME_ZONE_INFORMATION *ptzi,
OUT KSYSTEM_TIME *pBias)
/*++
Routine Description:
Calculates current bias and time zone ID.
Arguments:
IN CONST TIME_ZONE_INFORMATION *ptzi - time zone for which to calculate bias
OUT KSYSTEM_TIME *pBias - current bias
Return Value:
TIME_ZONE_ID_UNKNOWN - daylight saving time is not used in the
current time zone.
TIME_ZONE_ID_STANDARD - The system is operating in the range covered
by StandardDate.
TIME_ZONE_ID_DAYLIGHT - The system is operating in the range covered
by DaylightDate.
TIME_ZONE_ID_INVALID - The operation failed. Extended error status is
available using GetLastError.
--*/
{
LARGE_INTEGER TimeZoneBias;
LARGE_INTEGER NewTimeZoneBias;
LARGE_INTEGER LocalCustomBias;
LARGE_INTEGER StandardTime;
LARGE_INTEGER DaylightTime;
LARGE_INTEGER UtcStandardTime;
LARGE_INTEGER UtcDaylightTime;
SYSTEMTIME CurrentSystemTime;
LARGE_INTEGER CurrentUniversalTime;
ULONG CurrentTimeZoneId = 0xffffffff;
TIME_FIELDS StandardStart,DaylightStart;
NewTimeZoneBias.QuadPart = Int32x32To64(ptzi->Bias*60, 10000000);
//
// Now see if we have stored cutover times
//
if ( ptzi->StandardDate.wMonth && ptzi->DaylightDate.wMonth ) {
GetSystemTime(&CurrentSystemTime);
SystemTimeToFileTime(&CurrentSystemTime,(LPFILETIME)&CurrentUniversalTime);
StandardStart.Year = ptzi->StandardDate.wYear ;
StandardStart.Month = ptzi->StandardDate.wMonth ;
StandardStart.Weekday = ptzi->StandardDate.wDayOfWeek ;
StandardStart.Day = ptzi->StandardDate.wDay ;
StandardStart.Hour = ptzi->StandardDate.wHour ;
StandardStart.Minute = ptzi->StandardDate.wMinute ;
StandardStart.Second = ptzi->StandardDate.wSecond ;
StandardStart.Milliseconds = ptzi->StandardDate.wMilliseconds;
DaylightStart.Year = ptzi->DaylightDate.wYear ;
DaylightStart.Month = ptzi->DaylightDate.wMonth ;
DaylightStart.Weekday = ptzi->DaylightDate.wDayOfWeek ;
DaylightStart.Day = ptzi->DaylightDate.wDay ;
DaylightStart.Hour = ptzi->DaylightDate.wHour ;
DaylightStart.Minute = ptzi->DaylightDate.wMinute ;
DaylightStart.Second = ptzi->DaylightDate.wSecond ;
DaylightStart.Milliseconds = ptzi->DaylightDate.wMilliseconds;
//
// We have timezone cutover information. Compute the
// cutover dates and compute what our current bias
// is
//
if((!RtlCutoverTimeToSystemTime(&StandardStart,&StandardTime,
&CurrentUniversalTime,TRUE)) ||
(!RtlCutoverTimeToSystemTime(&DaylightStart,&DaylightTime,
&CurrentUniversalTime,TRUE))) {
BaseSetLastNTError(STATUS_INVALID_PARAMETER);
return TIME_ZONE_ID_INVALID;
}
//
// Convert standard time and daylight time to utc
//
LocalCustomBias.QuadPart = Int32x32To64(ptzi->StandardBias*60, 10000000);
TimeZoneBias.QuadPart = NewTimeZoneBias.QuadPart + LocalCustomBias.QuadPart;
UtcDaylightTime.QuadPart = DaylightTime.QuadPart + TimeZoneBias.QuadPart;
LocalCustomBias.QuadPart = Int32x32To64(ptzi->DaylightBias*60, 10000000);
TimeZoneBias.QuadPart = NewTimeZoneBias.QuadPart + LocalCustomBias.QuadPart;
UtcStandardTime.QuadPart = StandardTime.QuadPart + TimeZoneBias.QuadPart;
//
// If daylight < standard, then time >= daylight and
// less than standard is daylight
//
if ( UtcDaylightTime.QuadPart < UtcStandardTime.QuadPart ) {
//
// If today is >= DaylightTime and < StandardTime, then
// We are in daylight savings time
//
if ( (CurrentUniversalTime.QuadPart >= UtcDaylightTime.QuadPart) &&
(CurrentUniversalTime.QuadPart < UtcStandardTime.QuadPart) ) {
CurrentTimeZoneId = TIME_ZONE_ID_DAYLIGHT;
} else {
CurrentTimeZoneId = TIME_ZONE_ID_STANDARD;
}
} else {
//
// If today is >= StandardTime and < DaylightTime, then
// We are in standard time
//
if ( (CurrentUniversalTime.QuadPart >= UtcStandardTime.QuadPart ) &&
(CurrentUniversalTime.QuadPart < UtcDaylightTime.QuadPart ) ) {
CurrentTimeZoneId = TIME_ZONE_ID_STANDARD;
} else {
CurrentTimeZoneId = TIME_ZONE_ID_DAYLIGHT;
}
}
//
// At this point, we know our current timezone and the
// Universal time of the next cutover.
//
LocalCustomBias.QuadPart = Int32x32To64(
CurrentTimeZoneId == TIME_ZONE_ID_DAYLIGHT ?
ptzi->DaylightBias*60 :
ptzi->StandardBias*60, // Bias in seconds
10000000
);
TimeZoneBias.QuadPart = NewTimeZoneBias.QuadPart + LocalCustomBias.QuadPart;
} else {
TimeZoneBias = NewTimeZoneBias;
CurrentTimeZoneId=TIME_ZONE_ID_UNKNOWN;
}
pBias->LowPart=(ULONG)(TimeZoneBias.LowPart);
pBias->High1Time=pBias->High2Time=(LONG)(TimeZoneBias.HighPart);
return CurrentTimeZoneId;
}
BOOL
IsTimeZoneRedirectionEnabled()
{
/*++
Routine Description:
Checks if all conditions are met to allow Time Zone redirection
on the TS session.
Arguments:
NONE
Return Value:
TRUE - if we allowed to do TZ redirection.
--*/
return (BaseStaticServerData->TermsrvClientTimeZoneId != TIME_ZONE_ID_INVALID);
}
/*
//These 2 functions will be needed for new timedate.cpl
DWORD
WINAPI
GetServerTimeZoneInformation(
LPTIME_ZONE_INFORMATION lpTimeZoneInformation
)
{
RTL_TIME_ZONE_INFORMATION tzi;
NTSTATUS Status;
//
// get the timezone data from the system
//
Status = NtQuerySystemInformation(
SystemCurrentTimeZoneInformation,
&tzi,
sizeof(tzi),
NULL
);
if ( !NT_SUCCESS(Status) ) {
BaseSetLastNTError(Status);
return 0xffffffff;
}
lpTimeZoneInformation->Bias = tzi.Bias;
lpTimeZoneInformation->StandardBias = tzi.StandardBias;
lpTimeZoneInformation->DaylightBias = tzi.DaylightBias;
RtlCopyMemory(&lpTimeZoneInformation->StandardName,&tzi.StandardName,sizeof(tzi.StandardName));
RtlCopyMemory(&lpTimeZoneInformation->DaylightName,&tzi.DaylightName,sizeof(tzi.DaylightName));
lpTimeZoneInformation->StandardDate.wYear = tzi.StandardStart.Year ;
lpTimeZoneInformation->StandardDate.wMonth = tzi.StandardStart.Month ;
lpTimeZoneInformation->StandardDate.wDayOfWeek = tzi.StandardStart.Weekday ;
lpTimeZoneInformation->StandardDate.wDay = tzi.StandardStart.Day ;
lpTimeZoneInformation->StandardDate.wHour = tzi.StandardStart.Hour ;
lpTimeZoneInformation->StandardDate.wMinute = tzi.StandardStart.Minute ;
lpTimeZoneInformation->StandardDate.wSecond = tzi.StandardStart.Second ;
lpTimeZoneInformation->StandardDate.wMilliseconds = tzi.StandardStart.Milliseconds;
lpTimeZoneInformation->DaylightDate.wYear = tzi.DaylightStart.Year ;
lpTimeZoneInformation->DaylightDate.wMonth = tzi.DaylightStart.Month ;
lpTimeZoneInformation->DaylightDate.wDayOfWeek = tzi.DaylightStart.Weekday ;
lpTimeZoneInformation->DaylightDate.wDay = tzi.DaylightStart.Day ;
lpTimeZoneInformation->DaylightDate.wHour = tzi.DaylightStart.Hour ;
lpTimeZoneInformation->DaylightDate.wMinute = tzi.DaylightStart.Minute ;
lpTimeZoneInformation->DaylightDate.wSecond = tzi.DaylightStart.Second ;
lpTimeZoneInformation->DaylightDate.wMilliseconds = tzi.DaylightStart.Milliseconds;
return USER_SHARED_DATA->TimeZoneId;
}
BOOL
WINAPI
SetServerTimeZoneInformation(
CONST TIME_ZONE_INFORMATION *lpTimeZoneInformation
)
{
RTL_TIME_ZONE_INFORMATION tzi;
NTSTATUS Status;
tzi.Bias = lpTimeZoneInformation->Bias;
tzi.StandardBias = lpTimeZoneInformation->StandardBias;
tzi.DaylightBias = lpTimeZoneInformation->DaylightBias;
RtlCopyMemory(&tzi.StandardName,&lpTimeZoneInformation->StandardName,sizeof(tzi.StandardName));
RtlCopyMemory(&tzi.DaylightName,&lpTimeZoneInformation->DaylightName,sizeof(tzi.DaylightName));
tzi.StandardStart.Year = lpTimeZoneInformation->StandardDate.wYear ;
tzi.StandardStart.Month = lpTimeZoneInformation->StandardDate.wMonth ;
tzi.StandardStart.Weekday = lpTimeZoneInformation->StandardDate.wDayOfWeek ;
tzi.StandardStart.Day = lpTimeZoneInformation->StandardDate.wDay ;
tzi.StandardStart.Hour = lpTimeZoneInformation->StandardDate.wHour ;
tzi.StandardStart.Minute = lpTimeZoneInformation->StandardDate.wMinute ;
tzi.StandardStart.Second = lpTimeZoneInformation->StandardDate.wSecond ;
tzi.StandardStart.Milliseconds = lpTimeZoneInformation->StandardDate.wMilliseconds;
tzi.DaylightStart.Year = lpTimeZoneInformation->DaylightDate.wYear ;
tzi.DaylightStart.Month = lpTimeZoneInformation->DaylightDate.wMonth ;
tzi.DaylightStart.Weekday = lpTimeZoneInformation->DaylightDate.wDayOfWeek ;
tzi.DaylightStart.Day = lpTimeZoneInformation->DaylightDate.wDay ;
tzi.DaylightStart.Hour = lpTimeZoneInformation->DaylightDate.wHour ;
tzi.DaylightStart.Minute = lpTimeZoneInformation->DaylightDate.wMinute ;
tzi.DaylightStart.Second = lpTimeZoneInformation->DaylightDate.wSecond ;
tzi.DaylightStart.Milliseconds = lpTimeZoneInformation->DaylightDate.wMilliseconds;
Status = RtlSetTimeZoneInformation( &tzi );
if (!NT_SUCCESS( Status )) {
BaseSetLastNTError(Status);
return FALSE;
}
//
// Refresh the system's concept of time
//
NtSetSystemTime(NULL,NULL);
return TRUE;
}
*/