using System; class MainClass { public static void Main() { TimeSpan timespan1 = new TimeSpan(2, 12, 0, 0); TimeSpan timespan2 = new TimeSpan(4, 12, 0, 0); TimeSpan oneWeek = timespan1 + timespan2; DateTime now = DateTime.Now; DateTime past = now - oneWeek; DateTime future = now + oneWeek; Console.WriteLine("Now : {0}", now); Console.WriteLine("Past : {0}", past); Console.WriteLine("Future: {0}", future); } }