Performance Test for http://stackoverflow.com/q/30243541/331281

gistfile1.cs

    class Program
    {
        static void Main(string[] args)
        {
            const int count = 1000000;
            DateTime date = new DateTime(2015, 5, 14);
            int dateAsInt;
            DateTime deserialized;
            Stopwatch watch = new Stopwatch();

            watch.Restart();
            for (int i = 0; i < count; i++)
            {
                dateAsInt = DateToInt(date);
                deserialized = IntToDate(dateAsInt);
                Debug.Assert(deserialized.Equals(date));
            }
            watch.Stop();
            Console.WriteLine("BitVector: {0}", watch.ElapsedMilliseconds);

            watch.Restart();
            for (int i = 0; i < count; i++)
            {
                dateAsInt = (int)(date.Ticks / TimeSpan.TicksPerDay);
                long ticks = dateAsInt * System.TimeSpan.TicksPerDay;
                deserialized = new DateTime(ticks);
                Debug.Assert(deserialized.Equals(date));
            }
            watch.Stop();
            Console.WriteLine("Ticks division: {0}", watch.ElapsedMilliseconds);
            Console.ReadLine();

        }

        private static readonly BitVector32.Section YearSection = BitVector32.CreateSection(9999);
        private static readonly BitVector32.Section MonthSection = BitVector32.CreateSection(12, YearSection);
        private static readonly BitVector32.Section DaySection = BitVector32.CreateSection(31, MonthSection);

        private static int DateToInt(DateTime date)
        {
            var bv = new BitVector32(0);
            bv[YearSection] = date.Year;
            bv[MonthSection] = date.Month;
            bv[DaySection] = date.Day;
            return bv.Data;
        }

        private static DateTime IntToDate(int date)
        {
            var bv = new BitVector32(date);
            return new DateTime(bv[YearSection], bv[MonthSection], bv[DaySection]);
        }
    }