Greg Egan on Nostr: I wonder how cheap and small we could make a “dumb” chip that does nothing but ...

I wonder how cheap and small we could make a “dumb” chip that does nothing but grab the local time from either a mobile phone tower or digital TV broadcast on power-up, and then once an hour to cover things like daylight saving. No choice of method would be future-proof, but so long as manual adjustment was still possible that need not matter,