using System;

public static class Program

{

    public static void Main()

    {

        Console.WriteLine(DateTime.Now);

        Console.WriteLine(DateTime.Now.NextMidNight());

        Console.WriteLine(DateTime.Now.NextMidNight(2));

    }

    public static DateTime NextMidNight(this DateTime inputDateTime, int tolerance = 0)

    {

        DateTime midnightToday = DateTime.Today.AddHours(tolerance);

        if (DateTime.Now > midnightToday)

        {

            midnightToday = midnightToday.AddDays(1);

        }

        return midnightToday;

    }

}