Comment by collimarco

In any case those clocks are all extremely inaccurate, even if AI could build a decent UI (which is not the case).

Some months ago I published this site for fun: https://timeutc.com There's a lot of code involved to make it precise to the ms, including adjusting based on network delay, frame refresh rate instead of using setTimeout and much more. If you are curious take a look at the source code.