Earlier quoted context omitted.
I don’t find it hard to imagine living without a calendar, or with an arbitrary calendar whose divisions are entirely within my control. In fact, while it might be a strain to keep everything straight in my head without a traditional calendar, it wouldn’t be difficult using pen and paper. One use for a paper calendar is to record distant future events such as dentist appointments, and I don’t see how that would be ha…
What about adding a recurring 8 hour calendar block that comes every 17 hours? Then you have a graphical representation of your sleep across time that allows you to fit appointments in. If you can't program it, and the software makes this hard to do, you can use Amazon Turk or something.
I’m sure there is an API that I could use to add appointments, or I suppose could make an ical file and import it. I don’t quite have enough dentist appointments to make it worth while though. I did however spend an hour to make a spreadsheet. It only predicts my schedule for the next couple of weeks, but historically that’s been good enough for my colleagues.