mozman,
That is almost exactly what I did. I just changed them all to start and end one minute from midnight.
I'd like to adapt this to be a bit more like your scheme of having a KPL button and automatically set the button based on the calendar. I also sound chimes and make sure the kid's TVs are off at different times depending if it is a school night.
If I think about this I could probably do it with one KPL. Up until 9AM or so it indicates today is a school day, after that it indicates that tomorrow is a school day.
Thanks.
Jeff