My dad always said that the dashboard clock was the first thing that would break in a new car, because nobody needs a dashboard clock. Everything – placing the numbers, setting the color as the time of day changes – is done in a rule. For the moment, I’m leaving this as an exercise for the reader.
This isn't really meant for use; it's a folly or a fantasia. But it is a working clock.
Do you have a better way to do this? Or another nifty idea for a folly? Email me.