using System;

using System.IO;

​

public class Program

{

    public static void Main()

    {

        var GlobalStart = new DateTime(2020, 1, 1);

        var GlobalEnd = new DateTime(2020, 1, 20);

        DateTime aggregateStart = GlobalStart; //Init 

        while (aggregateStart < GlobalEnd)

        {

            DateTime aggregateEnd = aggregateStart.AddDays(1);

            //DO WORK

            Console.WriteLine("Running for " + aggregateStart.ToString() + "TO " + aggregateEnd.ToString());

            //DONE

            aggregateStart = aggregateEnd;

        }

    }

}