static void Main(string[] args)
        {
            DateTime dt = fsshijian("2170020102");
            Console.WriteLine(dt);
            string s = "4F60597D597D8FD80020521A521A597D597D597D5E724E56";
            byte[] b = new byte[24];
            for (int i = 0; i < 24; i++)
                b[i] = Convert.ToByte(s.Substring(i * 2, 2), 16);
            string mmsg = Encoding.BigEndianUnicode.GetString(b);
            Console.WriteLine(mmsg);
            Console.ReadLine();
        }
        static DateTime fsshijian(string sj)
        {
            DateTime dt = new DateTime();
            if (sj.Length == 10)
            {
                char* ca = stackalloc char[16];
                ca[0] = '2';
                ca[1] = '0';
                ca[2] = sj[1];
                ca[3] = sj[0];
                ca[4] = '/';
                ca[5] = sj[3];
                ca[6] = sj[2];
                ca[7] = '/';
                ca[8] = sj[5];
                ca[9] = sj[4];
                ca[10] = ' ';
                ca[11] = sj[7];
                ca[12] = sj[6];
                ca[13] = ':';
                ca[14] = sj[9];
                ca[15] = sj[8];
                DateTime.TryParse(new string(ca, 0, 16), out dt);
            }
            return dt;
        }