iCal: display availability on a website

Morning.

I'm using the CalDAV server on Mac OS X 10.6.8 Server to keep my calendars (private and business) on my Macs and iOS devices synchronously.

Now I want to launch a website to display all my available times. With other words: The website should not show the descriptions and the places of my events, but only the times, when I am available or not available on workdays between 9 am and 5 pm.

How can I achieve such a website?

Kind regards, Friedrich