Select date from sql specified format c#

Question

Select date from sql specified format?

 

string date = "";
using (SqlConnection openCon = new SqlConnection(cs))
{
    SqlDataReader reader;
    SqlCommand cmd = new SqlCommand();
    cmd.CommandText = "select datum from mp_racun_lista where id=" + id_fakture;
     cmd.Connection = openCon10;
     openCon.Open();
     reader = cmd.ExecuteReader();

     while (reader.Read())
     {
         date = reader[0].ToString();
     }
     openCon.Close();
}