The PTB (national metrology institute of Germany) provides a similar clock for decades. It is one of the few displaying the real time, not your computer’s time.

The PTB (national metrology institute of Germany) provides a similar clock for decades. It is one of the few displaying the real time, not your computer’s time. The difference (if any) can be shown. There is also a time announcement if needed. https://uhr.ptb.de/ https://uhr.ptb.de/