using System;

public class Program

{

        public static DateTime JoinNullableDateTime(DateTime? date, DateTime? time)

        {

            if (date != null)

            {

                if (time != null)

                    return date.Value.Date.Add(time.Value.TimeOfDay);

                else

                    return date.Value.Date;

            }

            else if (time != null)

                return DateTime.MinValue.Add(time.Value.TimeOfDay);

            else

                return DateTime.MinValue;

        }

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}