How to enable seconds mode in clock display on Apple TV, Apple Vision Pro, and iPad?

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My own “work-around” … one of these:

https://www.lacrossetechnology.com/products/wt-3143ax1

Your reply caused me to pull-out the clock’s actual user manual.

It’s capable of being manually set for 12x time zones. (as it’s only a 12-hour clock; the “other 12” time zones are unnecessary)

That said, it’s “sync’d” from WWVB and WWVBH … so the further you are from Colorado or Hawaii, the weaker the sync signal …

… but the Low Frequency 60 kHz signal (5k meters) has some long legs.

My own “work-around” … one of these

Pretty neat, but unfortunately for me only four timezones are listed as supported.

Correction:

WWVH in Hawaii does NOT transmit the 60 kHz clock-sync signal (i.e. WWVB)

That signal only originates in Colorado.