List<Class1> YourList = new List<Class1>();
            YourList.OrderByDescending(x => x.data.Date).ThenByDescending(x => x.data.TimeOfDay).ToList(); // sortowanie listy dat malejaco
            YourList.OrderBy(x => x.data.Date).ThenBy(x => x.data.TimeOfDay).ToList(); //sortowanie rosnaco


            DateTime date1 = new DateTime(2009, 8, 1, 0, 0, 0);
            if (date1 < DateTime.Now)
                Console.WriteLine("Less than the current time!");


            string userInput = "";
            DateTime userDate = DateTime.ParseExact(userInput, "dd-MM-yyyy", null);