gistfile1.cs

public class GuidCombGenerator : IIdentifierGenerator
{
    // Methods
    public object Generate(ISessionImplementor session, object obj)
    {
        return this.GenerateComb();
    }

    private 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);
    }
}