public static extern int SystemTimeToTzSpecificLocalTime(ref TIME_ZONE_INFORMATION lpTimeZoneInformation, ref SYSTEMTIME lpUniversalTime, ref SYSTEMTIME lpLocalTime);
public static extern int SystemTimeToFileTime(ref SYSTEMTIME lpSystemTime, ref FILETIME lpFileTime);
public static extern int SetSystemTime(ref SYSTEMTIME lpSystemTime);
public static extern int GetTimeFormat(int Locale, int dwFlags, ref SYSTEMTIME lpTime, string lpFormat, string lpTimeStr, int cchTime);
public static extern void GetSystemTime(ref SYSTEMTIME lpSystemTime);
public static extern int GetDateFormat(int Locale, int dwFlags, ref SYSTEMTIME lpDate, string lpFormat, string lpDateStr, int cchDate);