BOOLEAN NTAPI ExRefreshTimeZoneInformation ( IN PLARGE_INTEGER CurrentBootTime )
Definition at line 230 of file time.c.
Referenced by Phase1InitializationDiscard().
{
    LARGE_INTEGER CurrentTime;
    NTSTATUS Status;

    /* Read time zone information from the registry */
    Status = RtlQueryTimeZoneInformation(&ExpTimeZoneInfo);
    if (!NT_SUCCESS(Status))
    {
        /* Failed, clear all data */
        RtlZeroMemory(&ExpTimeZoneInfo, sizeof(TIME_ZONE_INFORMATION));
        ExpTimeZoneBias.QuadPart = (LONGLONG)0;
        ExpTimeZoneId = TIME_ZONE_ID_UNKNOWN;
    }
    else
    {
        /* FIXME: Calculate transition dates */

        /* Set bias and ID */
        ExpTimeZoneBias.QuadPart = ((LONGLONG)(ExpTimeZoneInfo.Bias +
            ExpTimeZoneInfo.StandardBias)) *
            TICKSPERMINUTE;
        ExpTimeZoneId = TIME_ZONE_ID_STANDARD;
    }

    /* Change it for user-mode applications */
    SharedUserData->TimeZoneBias.High1Time = ExpTimeZoneBias.u.HighPart;
    SharedUserData->TimeZoneBias.High2Time = ExpTimeZoneBias.u.HighPart;
    SharedUserData->TimeZoneBias.LowPart = ExpTimeZoneBias.u.LowPart;
    SharedUserData->TimeZoneId = ExpTimeZoneId;

    /* Convert boot time from local time to UTC */
    KeBootTime.QuadPart += ExpTimeZoneBias.QuadPart;

    /* Convert system time from local time to UTC */
    do
    {
        CurrentTime.u.HighPart = SharedUserData->SystemTime.High1Time;
        CurrentTime.u.LowPart = SharedUserData->SystemTime.LowPart;
    } while (CurrentTime.u.HighPart != SharedUserData->SystemTime.High2Time);

    /* Change it for user-mode applications */
    CurrentTime.QuadPart += ExpTimeZoneBias.QuadPart;
    SharedUserData->SystemTime.LowPart = CurrentTime.u.LowPart;
    SharedUserData->SystemTime.High1Time = CurrentTime.u.HighPart;
    SharedUserData->SystemTime.High2Time = CurrentTime.u.HighPart;

    /* Return success */
    return TRUE;
}
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