public static extern int CeRunAppAtTime(string application, SystemTime startTime);
 private static extern void GetSystemTime(ref SystemTime sysTime);
 public static SystemTime GetSystemTime()
 {
     SystemTime s = new SystemTime();
     GetSystemTime(ref s);
     return s;
 }
 public static void SetSystemTime(SystemTime sysTime)
 {
     SetSystemTime(ref sysTime);
 }
 private static extern void SetLocalTime(ref SystemTime sysTime);