I’m not familiar with clocks in stoves, but most clocks in devices connect to a time server over the internet to adjust their times. A time server is a computer which reads time from a reference clock (such as atomic clocks) and distributes that information to connecting/querying devices
That connection could be cellular, WiFi or satellites
Edit: just to add, before the internet and the “internet of things” frameworks, I recall we used to get the _official/government time_ on TV channels or on radio stations with which we used to adjust our clocks if any of them were out of pace
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