I remember years ago I bought a clock that advertised it set itself using the atomic clock broadcast.
Which it did. The very first time it was plugged in, and then never again after. The clock also kept horrible time, it lost a couple minutes every month. Truly an astonishing piece of wtf engineering.
I really wish microwaves and ovens came with radio-controlled clocks.
While the mains frequency is usually a great (long-term) stable frequency source, the bigger problem is that all microwaves I know lack a backup battery and require re-setting after unplugging them.
I recently bought 2 of them.
You have to specifically look for the feature. Most do not have it.
Just to revisit this - I actually bought an "automatic setting" clock now that I saw one at Walmart.
Unfortunately, Sharp is lying. "Accu-Set(tm)" is them factory-programming the clock IC and just shipping a button cell in the box and hoping it holds time. My clock was 5 minutes behind and I have to manually set it. No RDS, no radiotime, nothing.
Oi... guess I have to be even more specific in my product hunt.
What's weird is it seems like for a long time now I haven't seen "self setting" clocks on retail shelves in a while at big box stores. Everyone went back to just manual timekeeping and I haven't seen a self-setter in a hot minute.