Change Datatable Column Date Format

I'm working with a txt files, I must insert that data in mysql database. So I get that info in a Datatable, then I can get that data in my gridview and I must insert that data in database. I can do that, but I have problems with date columns.

For example, When I try to insert, If I have this date in datagridview: 12/01/2018 no problem, but if I have 17/01/2018 not insert, I have manually changed and I've probed it.

this is read txt:

string LogAutoriz_fileName = Server.MapPath("~/Files/") + User.Identity.Name.ToString() + "_" + Path.GetFileName(fup_LogAutoriz_File.PostedFile.FileName);
    fup_LogAutoriz_File.SaveAs(LogAutoriz_fileName);

    DataTable dt = new DataTable();

    List<string[]> list = new List<string[]>();
    int maxItem = 0;
    using (System.IO.TextReader tr = File.OpenText(LogAutoriz_fileName))
    {
        string line;
        while ((line = tr.ReadLine()) != null)
        {
            string[] items = line.Trim().Split('    ');
            if (maxItem <= items.Count())
            {
                maxItem = items.Count();
            }
            list.Add(items);
        }


        //Crear las columnas del DataTable de Datos
        dt.Columns.Add("Comprobante", typeof(string));
        dt.Columns.Add("Serie_Comprobante", typeof(string));
        dt.Columns.Add("Ruc_Emisor", typeof(string));
        dt.Columns.Add("RazonSoc_Emisor", typeof(string));
        dt.Columns.Add("Fecha_Emision", typeof(string));
        dt.Columns.Add("Fecha_Autoriz", typeof(string));
        dt.Columns.Add("Tipo_Emision", typeof(string));
        dt.Columns.Add("Ident_Receptor", typeof(string));
        dt.Columns.Add("Basura", typeof(string));
        dt.Columns.Add("Clave_Acceso", typeof(string));
        dt.Columns.Add("Numero_Autor", typeof(string));
        dt.Columns.Add("Importe_Total", typeof(string));



        foreach (var items in list)
        {
            dt.Rows.Add(items);
        }


        //cargar al grid
        this.gvwAutorizaciones.DataSource = dt;
        this.gvwAutorizaciones.DataBind();

And this is for insert every gridview record in data base:

try
{
    using (MySqlConnection sqlCon = new MySqlConnection(conn))
    {
        using (MySqlCommand cmd = new MySqlCommand())
        {
            cmd.CommandText = "Insert into autorizaciones " +
                "(comprobante, Serie_Comprobante, Ruc_Emisor, RazonSoc_Emisor, " +
                "Fecha_Emision, Fecha_Autorizacion, " +
                "Tipo_Emision, Ident_Receptor, Clave_Acceso, Numero_Autorizacion) " +
                "values(" +
                "'" + comprob + "', " +
                "'" + serComprob + "', " +
                "'" + rucEmisor + "', " +
                "'" + razSocEmi + "', " +
                "'" + FecEmisor + "', " +
                "'" + FecAutoriz + "', " +
                "'" + tipoEmision + "', " +
                "'" + identRecep + "', " +
                "'" + claveAcceso + "', " +
                "'" + numAutoriz + "')";
            cmd.Connection = sqlCon;
            sqlCon.Open();
            cmd.ExecuteNonQuery();
            sqlCon.Close();
        }
    }
}

catch (MySqlException ex)
{
}

I call this in a foreach and I can insert records, but for dates, I have that problem.

Is there any way to format the column datatable, for example "yyyy-mm-dd"?

If please anyone can help me,

thanks a lot best regards