this post was submitted on 10 Mar 2025
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That's existed since at least the 60's, maybe even earlier.
And electric clocks used to get their timing from the frequency of the electrical system, and power companies would compensate for any daily variations by changing the frequency over night so any timing systems would be back in sync.
Commercial buildings often used these kinds of clocks.
Are you sure you're talking about the same thing as me? Sounds like devices use the 50/60 Hz grid frequency instead of an internal resonator/frequency generator to count forward the seconds. But it doesn't tell the device "what time is it now" when you first switch it on.