C#实现UTC时间与Datetime转换

为了便于传输，通信过程中传输的都是：当前时间跟标准时间相隔的秒数，并且是以16进制字节的形式传输的。

 public double ConvertDateTimeInt(System.DateTime time)//将时间格式的数据类型转换成浮点数类型
         {
             double intResult = ;
             System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(, , ));
             intResult =(time - startTime).TotalSeconds;
             return intResult;
         }

         public DateTime ConvertIntDatetime(double utc)
         {
             System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(, , ));
             startTime = startTime.AddSeconds(utc);
             startTime = startTime.AddHours();//转化为北京时间(北京时间=UTC时间+8小时 )
             return startTime;
         }

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

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

 private void button1_Click(object sender, EventArgs e)//这种只是显示的形式不同，未达到目的
          {
              DateTime utc_tem = DateTime.UtcNow;

              double utc = ConvertDateTimeInt(utc_tem);//相对应的秒数！
              byte[] s = new byte[];
             s = ConvertDoubleByte(utc);

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