C#實現UTC時間與Datetime轉換

為了便於傳輸，通信過程中傳輸的都是：當前時間跟標准時間相隔的秒數，並且是以16進制字節的形式傳輸的。

public double ConvertDateTimeInt(System.DateTime time)//將時間格式的數據類型轉換成浮點數類型   
        {
            double intResult = 0;
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            intResult =(time - startTime).TotalSeconds;
            return intResult;
        }

        public DateTime ConvertIntDatetime(double utc)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            startTime = startTime.AddSeconds(utc);
            startTime = startTime.AddHours(8);//轉化為北京時間(北京時間=UTC時間+8小時 )
            return startTime;
        }

 public byte[] ConvertDoubleByte(double d) 
        {
            byte[] result = new byte[4];
            float f=(float)d;
            result = BitConverter.GetBytes(f);
            return result;
        }

        public double  ConvertByteDouble(byte [] d)
        {
            double result=0;
            float q = BitConverter.ToSingle(d, 0);
            result = (double)q;
            return result;
        }

private void button1_Click(object sender, EventArgs e)//這種只是顯示的形式不同，未達到目的
         {
             DateTime utc_tem = DateTime.UtcNow;

             double utc = ConvertDateTimeInt(utc_tem);//相對應的秒數！
             byte[] s = new byte[4];
            s = ConvertDoubleByte(utc);


            DateTime mytime = ConvertIntDatetime(1429647491.3936753);
            byte[] b = new byte[4] { 0x80,0x6d,0xaa,0x4e};
            mytime = ConvertIntDatetime(ConvertByteDouble(b));
        }