It redraws it every minute, and some models give quite different results although the prompt is exactly the same.

I'm not really sure how this works, but I stayed on the page for a while, and then it reloaded and all clocks changed. I guess there's either a collection of different clocks generated by models, or maybe they're somehow generated in the real time, but the fact is what you see is not necessarily what I see.

It reruns the prompt every minute.