using System;

public class Program

{

    public static void Main()

    {

        var dateTest = DateTime.Now;

        var safeHoursEnd = 7;

        var timeSpanToEdit = new TimeSpan(dateTest.Day + 1, safeHoursEnd, 0, 0);

        Console.WriteLine("Date original: " + dateTest);

        dateTest = dateTest.Date.Add(timeSpanToEdit);

        Console.WriteLine("Date after add: " + dateTest);

    }

}