using System;

using Microsoft.VisualBasic;

public class Program

{

    public static void Main()

    {

        var today = DateTime.Today;

        var tomorrow = DateTime.Today.AddDays(1);

        var _now = new DateTime(2023, 4, 13);

        var memoCancelDate = new DateTime(2023, 4, 23);

        var odenMailDays = 1;

        var intermediateResult = DateAndTime.DateAdd(DateInterval.Day, -1 * odenMailDays,

                        DateTime.Parse(memoCancelDate.ToShortDateString() + " 12:00:00 AM"));

        var result = (int)DateAndTime.DateDiff(DateInterval.Day,

                    _now,

                    intermediateResult);

        Console.WriteLine("Intermediate result: " + intermediateResult);

        Console.WriteLine(result);

        Console.WriteLine(DateAndTime.DateDiff(DateInterval.Day, today, tomorrow));

    }

}