Question

Hello people i am doing an app on C# and now i am with a doubt.

I need to represent relative time, for example i have 02:30:00 i will need to say that is 2,5 hours.

How can i do that, and i need that have to be with 2 decimals here is what i have done so far, but i gives me errors with timespan

private string Horas_Matutinas(string cedula, DateTime desde, DateTime hasta)
    {
        string respuesta = "";
        DateTime resto = Convert.ToDateTime("00:00:00");
        //Llamo la conexion SQL
        SqlConnection Wdcon_usuario = new SqlConnection(WDcon);
        SqlCommand usuario = new SqlCommand();
        SqlDataReader usuarioDR = null;
        TimeSpan tiempo = Convert.ToDateTime("00:00:00") - Convert.ToDateTime("00:00:00");
        //Instancio la conexion SQL
        usuario.Connection = Wdcon_usuario;

        //Registro el Query SQL
        usuario.CommandText = "SELECT * FROM matutino WHERE " +
        "(cedula = @ID) AND " +
        "(desde >= @DESDE) AND " +
        "(hasta <= @HASTA)";
        usuario.Parameters.AddWithValue("@ID", Convert.ToInt64(cedula));
        usuario.Parameters.AddWithValue("@DESDE", Convert.ToDateTime(desde));
        usuario.Parameters.AddWithValue("@HASTA", Convert.ToDateTime(hasta));

        //Abro la conexion
        Wdcon_usuario.Open();

        //Ejecuto la consulta
        usuarioDR = usuario.ExecuteReader();

        //Empiezo el ciclo
        while (usuarioDR.Read())
        {
            TimeSpan tiempX = (DateTime)usuarioDR["tiempotrbajado"] - resto;
            tiempo = tiempo + tiempX;
            Double tiemp = Convert.ToDouble(tiempo);
            respuesta = tiempo.ToString("0.00");

        }
        //Cierro la conexion
        Wdcon_usuario.Close();
        //Termino la sentencia SQL

        //int i = 0;
        int total = 8;
        int caracteres = respuesta.Length;
        int restantes = total - caracteres;

        //respuesta.PadLeft(restantes, "0");


        string s = new String('0', restantes) + respuesta;
        return s;
    }

Answer 1

It looks like you need the difference between two times here, this example might help you out.

DateTime now = DateTime.Now;
DateTime later = DateTime.Now.AddHours(2.5);
double diff = (later - now).TotalHours;
var x = String.Format("{0:0.00}", diff);

Also, you can create resto and tiempo without using Convert. Instead, you can use:

DateTime resto = DateTime.Now.Date;
TimeSpan tiempo = new TimeSpan();