You know what, that's an excellent idea. If I have time over the summer I might do what you have suggested. Time is the issue for me.
I'm actually planning on selling it. I just don't have the time and it was because I had time that this idea was conceived and produced. I was working on a project where we had to find difference between two dates with the option of excluding certain days (i.e. weekends) and the site is pretty much a mash up of things I thought would be interesting.
I have to say that your input is highly appreciated and so thank you very very much.