using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World - LastDayOfMonth");

        var today = DateTime.Today;

        var lastDayOfMonth = LastDayOfMonth(today);

        Console.WriteLine("today={0}", today);

        Console.WriteLine("lastDayOfMonth={0}", lastDayOfMonth);

    }

    private static DateTime LastDayOfMonth(DateTime inDate)

    {

        return new DateTime(inDate.Year, inDate.Month, 1).AddMonths(1).AddDays(-1);

    }

}