public static extern bool SetSystemTime(ref SYSTEMTIME lpSystemTime);
public static extern int GetTimeFormat(int Locale, int dwFlags, ref SYSTEMTIME lpTime, string lpFormat, StringBuilder lpTimeStr, int cchTime);
public static extern int GetDateFormat(int Locale, int dwFlags, ref SYSTEMTIME lpDate, string lpFormat, StringBuilder lpDateStr, int cchDate);
public static extern void GetSystemTime(ref SYSTEMTIME lpSystemTime);
public static extern int FileTimeToSystemTime(ref _FILETIME lpFileTime, ref SYSTEMTIME lpSystemTime);