CombGuid generator

CombGuid

//from NHibernate source. Very helpful to prevent fragmentation when using Guid with clustered PK 

Guid GenerateComb()
{
    byte[] destinationArray = Guid.NewGuid().ToByteArray();
    DateTime time = new DateTime(0x76c, 1, 1);
    DateTime now = DateTime.Now;
    TimeSpan span = new TimeSpan(now.Ticks - time.Ticks);
    TimeSpan timeOfDay = now.TimeOfDay;
    byte[] bytes = BitConverter.GetBytes(span.Days);
    byte[] array = BitConverter.GetBytes((long) (timeOfDay.TotalMilliseconds / 3.333333));
    Array.Reverse(bytes);
    Array.Reverse(array);
    Array.Copy(bytes, bytes.Length - 2, destinationArray, destinationArray.Length - 6, 2);
    Array.Copy(array, array.Length - 4, destinationArray, destinationArray.Length - 4, 4);
    return new Guid(destinationArray);
}