1 public double ConvertDateTimeInt(System.DateTime time)//将时间格式的数据类型转换成浮点数类型
 2         {
 3             double intResult = 0;
 4             System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
 5             intResult =(time - startTime).TotalSeconds;
 6             return intResult;
 7         }
 8
 9         public DateTime ConvertIntDatetime(double utc)
10         {
11             System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
12             startTime = startTime.AddSeconds(utc);
13             startTime = startTime.AddHours(8);//转化为北京时间(北京时间=UTC时间+8小时 )
14             return startTime;
15         }

 1  public byte[] ConvertDoubleByte(double d)
 2         {
 3             byte[] result = new byte[4];
 4             float f=(float)d;
 5             result = BitConverter.GetBytes(f);
 6             return result;
 7         }
 8
 9         public double  ConvertByteDouble(byte [] d)
10         {
11             double result=0;
12             float q = BitConverter.ToSingle(d, 0);
13             result = (double)q;
14             return result;
15         }

 1 private void button1_Click(object sender, EventArgs e)//这种只是显示的形式不同，未达到目的
 2          {
 3              DateTime utc_tem = DateTime.UtcNow;
 4
 5              double utc = ConvertDateTimeInt(utc_tem);//相对应的秒数！
 6              byte[] s = new byte[4];
 7             s = ConvertDoubleByte(utc);
 8
 9
10             DateTime mytime = ConvertIntDatetime(1429647491.3936753);
11             byte[] b = new byte[4] { 0x80,0x6d,0xaa,0x4e};
12             mytime = ConvertIntDatetime(ConvertByteDouble(b));
13         }