using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        DateTime beginDate = new DateTime(2021, 7, 9);

        DateTime endDate = DateTime.Now.Date;

        int numDays = Convert.ToInt32((endDate - beginDate).TotalDays);

        Console.WriteLine("Total days: " + numDays);

        var currDay = beginDate;

        while (currDay < endDate)

        {

            var idx = numDays - Convert.ToInt32((endDate - currDay).TotalDays);

            Console.WriteLine($"{currDay}, {idx}");

            currDay = currDay.AddDays(1).Date;

        }

    }

}