Time Sync with Serial GPS Module

GPS_Serial_TimeSync.cs

private void SyncGPSTime()
{
    if (!privileged)
        privileged = EnableTimesync();

    var time = new SYSTEMTIME();
    var GPSSerial = new SerialPort()
    {
        PortName = setting.ports.gps,
        BaudRate = 9600,
        Parity = Parity.None,
        DataBits = 8,
        StopBits = StopBits.One,
        ReadTimeout = 5000
    };

    GPSSerial.DataReceived += (obj, arg) =>
    {
        var senderPort = (SerialPort)obj;
        var dataSize = senderPort.BytesToRead;
        var buffer = new byte[dataSize];

        senderPort.Read(buffer, 0, dataSize);
        
        lock (nmeaBuffer)
        {
            nmeaBuffer.AddRange(buffer);
            
            var nmeaStarted = false;

            for (var i = 0; i < buffer.Length; ++i)
            {
                if ( !nmeaStarted )
                {
                    if (buffer[i] != '$') continue;
                    else nmeaStarted = true;
                }

                nmeaBuffer.Add(buffer[i]);

                if (buffer[i] == '*')
                {
                    nmeaBuffer.Add(buffer[i+1]);
                    break;
                }
            }
           
        }

        var NMEA = Encoding.ASCII.GetString(nmeaBuffer.ToArray());
        nmeaBuffer.Clear();

        if (NMEA.StartsWith("$GPRMC"))
        {
            Program.Log(NMEA);

            var frags = NMEA.Split('$', ',');
            if (frags.Length < 3) return;

            try 
            {
                var utc = frags[2];
                
                Program.Log("Parsed UTC: {0}", utc);
                
                var hour = int.Parse(utc[0].ToString() + utc[1].ToString());
                var minute = int.Parse(utc[2].ToString() + utc[3].ToString());
                var second = int.Parse(utc[4].ToString() + utc[5].ToString());
                
                Program.Log("Parsed Time: {0}:{1}:{2}", hour, minute, second);
                

                time.wYear  = (short)DateTime.Now.Year;
                time.wMonth = (short)DateTime.Now.Month;
                time.wDay   = (short)DateTime.Now.Day;
                time.wDayOfWeek = (short)DateTime.Now.DayOfWeek;
                time.wHour = (short)(hour);
                time.wMinute = (short)minute;
                time.wSecond = (short)second;
                time.wMilliseconds = 0;

                Program.Log("time Struct data: {0}-{1}-{2} {3}:{4}:{5} UTC",
                    time.wYear, time.wMonth, time.wDay, time.wHour, time.wMinute, time.wSecond);
        
            }
            catch (IndexOutOfRangeException)
            {
                Program.Log("Received data is invalid, retry");
            }
            catch (FormatException e)
            {
                Program.Log("★★★★★★★★★★★★★★★");
                Program.Log(e.Source);
                Program.Log("★★★★★★★★★★★★★★★");
            }
            catch (Exception e)
            {
                Program.Log("★★★★★★★★★★★★★★★");
                Program.Log(e.Source);
                Program.Log("★★★★★★★★★★★★★★★");
            }

            syncSuccess = SetSystemTime(ref time);
            Program.Log("Sync Success: {0}, Error Code: {1}", syncSuccess, Marshal.GetLastWin32Error());
        }
        
    };
    
    try 
    {
        syncSuccess = false;
        GPSSerial.Open();

        SpinWait.SpinUntil(() => syncSuccess, 5000);

        if (!syncSuccess)
        {
            Program.Log("GPS Timeout; ignoring");
        }

        GPSSerial.Close();
        SetSystemTime(ref time);
    }
    catch (IOException)
    {
        Program.Log("GPS Failure");
    }
}