using System;

public class Program

{

    public static void Main()

    {

        /* DateTime + 7 days */

        DateTime dt = DateTime.Now.AddDays(7);

        Console.WriteLine(dt.ToString("u"));

        /* Set time to 9am */

        dt = dt.Date.Add(new TimeSpan(9, 0, 0));

        Console.WriteLine(dt.ToString("u"));

        /* DateTime + 7 days, add one day if the hour is already over 9 */

        dt = DateTime.Now.AddDays(7);

        dt = dt.Date.Add(new TimeSpan((dt.Hour >= 9 ? 1 : 0), 9, 0, 0));

        Console.WriteLine(dt.ToString("u"));

    }

}