public static extern int SetTimeZoneInformation(ref TIME_ZONE_INFORMATION lpTimeZoneInformation);
public static extern int SystemTimeToTzSpecificLocalTime(ref TIME_ZONE_INFORMATION lpTimeZoneInformation, ref SYSTEMTIME lpUniversalTime, ref SYSTEMTIME lpLocalTime);
[DllImport("kernel32", CharSet = CharSet.Unicode)] public static extern int GetTimeZoneInformation(ref TIME_ZONE_INFORMATION lpTimeZoneInformation);