using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        var str = "2024-08";

        var d = DateTime.ParseExact(str, "yyyy-MM", CultureInfo.InvariantCulture);

        Console.WriteLine($"Hello World: {d}");

        Console.WriteLine($"Hello World: {d.AddMonths(1).AddMilliseconds(-1)}");

    }

}