using System;

public class Program

{

    public static void Main()

    {

        //Console.WriteLine(Math.Round(100.627M, 2));

        //Console.WriteLine(Math.Round(100.625M, 2));

        //Console.WriteLine(Math.Round(100.622M, 2));

        //Console.WriteLine("Hello World");

        DateTime myDate = new DateTime(2018, 1, 31);

        Console.WriteLine(myDate);

        DateTime myDateTo = myDate.AddDays(1).AddMonths(1).AddDays(-1);

        Console.WriteLine(myDateTo);

        DateTime myDateToAgain = myDateTo.AddDays(1).AddMonths(1).AddDays(-1);

        Console.WriteLine(myDateToAgain);

        //Add year      

        Console.WriteLine("");

        Console.WriteLine("Adding a new year");

​

        DateTime myDateYear = new DateTime(2018, 2, 28);

        Console.WriteLine(myDateYear);

        DateTime myDateToYear = myDateYear.AddDays(1).AddMonths(2*12).AddDays(-1);

        Console.WriteLine(myDateToYear);

​

    }

}