public BabysitterTests()
 {
     babysitting = new Babysitting();
     year        = 2018;
     month       = 4;
     day         = 17;
     hour        = 17;
     minute      = 0;
     second      = 0;
     startTime   = new DateTime(year, month, 17, 17, minute, second);
     endTime     = new DateTime(year, month, 18, 4, minute, second);
     bedTime     = new DateTime(year, month, 17, 21, minute, second);
 }
        static void Main(string[] args)
        {
            var babysitting = new Babysitting();

            while (true)
            {
                Console.Clear();
                try
                {
                    Console.WriteLine("Babysitter Kata");
                    Console.WriteLine("Instructions: Enter date and hour where requested. Example 4/24/2018 5pm");
                    Console.WriteLine("For finishing the program press Ctrl+C\n");
                    Console.Write("Start time: ");
                    var startHour = Console.ReadLine();
                    babysitting.StartTime(DateTime.Parse(startHour));
                    Console.Write("End time: ");
                    var endHour = Console.ReadLine();
                    babysitting.EndTime(DateTime.Parse(endHour));
                    Console.Write("Bed time: ");
                    var bedTime = Console.ReadLine();
                    babysitting.BedTime(DateTime.Parse(bedTime));
                    Console.Write("Calculated nightly charge: ${0} dollars", babysitting.CalculateNightlyCharge());
                    Console.ReadLine();
                }
                catch (ArgumentNullException)
                {
                    Console.WriteLine("Date/hour not entered.");
                    Console.ReadLine();
                }
                catch (FormatException)
                {
                    Console.WriteLine("Date/hour writen in wrong format.");
                    Console.ReadLine();
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.Message);
                    Console.ReadLine();
                }
            }
        }