using System;

public class Program {

    private static int duration = 28;

    public static void Main() {

        DateTime rentalStartDate = new DateTime(2022, 01, 09);

        DateTime startDate = DateTime.Now;

        double dayDifference = getDayDifference(startDate, rentalStartDate);

        Console.Write("Date Difference after Math.Floor: ");

        Console.WriteLine(dayDifference);

        rentalStartDate = rentalStartDate.AddDays(duration * dayDifference);

        Console.WriteLine(rentalStartDate.ToString("MMMM dd, yyyy"));

    }

    //Gets the number of months that has transpired between the start date and

    //the current date. 

    private static double getDayDifference(DateTime endDate, DateTime startDate) {

        double difference = (endDate - startDate).TotalDays;

        Console.Write("Date Difference before Math.Floor: ");

        Console.WriteLine(difference);

        return Math.Floor(difference/duration);

    }

}