/***********************************************************************
* TzSpecificLocalTimeToSystemTime (KERNEL32.@)
*
* Converts a local time to a time in utc.
*
* PARAMS
* lpTimeZoneInformation [in] The desired time zone.
* lpLocalTime [in] The local time.
* lpUniversalTime [out] The calculated utc time.
*
* RETURNS
* Success: TRUE. lpUniversalTime contains the converted time.
* Failure: FALSE.
*/
BOOL WINAPI TzSpecificLocalTimeToSystemTime(
const TIME_ZONE_INFORMATION *lpTimeZoneInformation,
const SYSTEMTIME *lpLocalTime, LPSYSTEMTIME lpUniversalTime)
{
FILETIME ft;
LONG lBias;
LONGLONG t;
TIME_ZONE_INFORMATION tzinfo;
if (lpTimeZoneInformation != NULL)
{
tzinfo = *lpTimeZoneInformation;
}
else
{
if (GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_INVALID)
return FALSE;
}
if (!SystemTimeToFileTime(lpLocalTime, &ft))
return FALSE;
FILETIME2LL( &ft, t)
if (!TIME_GetTimezoneBias(&tzinfo, &ft, TRUE, &lBias))
return FALSE;
/* convert minutes to 100-nanoseconds-ticks */
t += (LONGLONG)lBias * 600000000;
LL2FILETIME( t, &ft)
return FileTimeToSystemTime(&ft, lpUniversalTime);
}
BOOL WINAPI SystemTimeToTzSpecificLocalTime(
LPTIME_ZONE_INFORMATION lpTimeZoneInformation,
LPSYSTEMTIME lpUniversalTime, LPSYSTEMTIME lpLocalTime )
{
FILETIME ft;
LONG lBias;
LONGLONG llTime;
TIME_ZONE_INFORMATION tzinfo;
if (lpTimeZoneInformation != NULL)
{
memcpy(&tzinfo, lpTimeZoneInformation, sizeof(TIME_ZONE_INFORMATION));
}
else
{
if (GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_INVALID)
return FALSE;
}
if (!SystemTimeToFileTime(lpUniversalTime, &ft))
return FALSE;
FILETIME2LL( &ft, llTime)
if (!TIME_GetTimezoneBias(&tzinfo, &ft, FALSE, &lBias))
return FALSE;
/* convert minutes to 100-nanoseconds-ticks */
llTime -= (LONGLONG)lBias * 600000000;
LL2FILETIME( llTime, &ft)
return FileTimeToSystemTime(&ft, lpLocalTime);
}
/*
* @implemented
*/
BOOL
WINAPI
SystemTimeToTzSpecificLocalTime(CONST TIME_ZONE_INFORMATION *lpTimeZoneInformation,
CONST SYSTEMTIME *lpUniversalTime,
LPSYSTEMTIME lpLocalTime)
{
TIME_ZONE_INFORMATION TzInfo;
FILETIME FileTime;
LONGLONG llTime;
LONG lBias;
if (lpTimeZoneInformation != NULL)
{
TzInfo = *lpTimeZoneInformation;
}
else
{
if (GetTimeZoneInformation(&TzInfo) == TIME_ZONE_ID_INVALID)
return FALSE;
}
if (!lpUniversalTime || !lpLocalTime)
return FALSE;
if (!SystemTimeToFileTime(lpUniversalTime, &FileTime))
return FALSE;
FILETIME2LL(&FileTime, llTime)
if (!TIME_GetTimezoneBias(&TzInfo, &FileTime, FALSE, &lBias))
return FALSE;
/* convert minutes to 100-nanoseconds-ticks */
llTime -= (LONGLONG)lBias * TICKSPERMIN;
LL2FILETIME( llTime, &FileTime)
return FileTimeToSystemTime(&FileTime, lpLocalTime);
}
