Convert JSON DateTime to normal DateTime using Newtonsoft Json in ASP.Net MVC

Hi,

I need populated on my MVC form View the TextBox below

 @Html.LabelFor(m => m.tDate)
 @Html.TextBoxFor(m => m.tDate, "{0:dd/MM/yyyy}", new { @class = "Mytextarea2" })
 @Html.ValidationMessageFor(m => m.tDate, "", new { @class = "text-danger" })

Whit value extract from controller

        model.tDate = Convert.ToDateTime(GetDateHourById(value).ToString());

        private static string GetDateHourById(string value)
        {
            string sql;
            string constr = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
            using (MySqlConnection con = new MySqlConnection(constr))
            {
                sql = @String.Format(" SELECT ");
                sql += String.Format(" tDate ");
                sql += String.Format(" FROM `dotable` ");
                sql += String.Format(" WHERE tID = @Id;");

                using (MySqlCommand cmd = new MySqlCommand(sql))
                {
                    cmd.Connection = con;
                    cmd.Parameters.AddWithValue("@Id", value);
                    con.Open();
                    string name = Convert.ToString(cmd.ExecuteScalar());
                    con.Close();

                    return name;
                }
            }
        }

But the TextBox is populed with this value

/Date(1609860060000)/

How to do resolve this?