how to insert selected date in to date base in date format

query = "Air_travel_request_insert";

        SqlCommand com = new SqlCommand(query, con);

        com.CommandType = CommandType.StoredProcedure;

        

        com.Parameters.AddWithValue("@FromPlace1", txtfrom1.Text.ToString()); ;

        com.Parameters.AddWithValue("@ToPlace1", txtto1.Text.ToString()); ;

        com.Parameters.AddWithValue("@DateOfJourny1", txtjd1.Text.ToString()); ;

        com.Parameters.AddWithValue("@FlightNo1", txtflno1.Text.ToString()); ;

        com.Parameters.AddWithValue("@DepartureTime1", txtdep1.Text.ToString()); ;
 com.ExecuteNonQuery();




i need to insert @dateofjourny1 to date format in "yyyy-mm-dd",DateOfJourny1 pick from ajax