But wait, 2-3 days ago I looked at my phone and my desktop time, and it was different.. Can this be somehow connected to this issue? It seems not, because both PC and mobile phone use internet... But strange...
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The question is when and how often they resynchronize over the Internet. I doubt that they directly depend on the frequency in the power supply as both a PC's mainboard and the phone are not directly connected to the AC power supply system. Both of them have AC-DC converters, phones (and laptops) can even be entirely independent of the grid as they of course have batteries. So if your problem is related to the frequency in the grid, then I assume that's due some other device sending your devices time data. I'm not sure whether infrastructure in the mobile network relies on the frequency to provide time information.
Thanks for the answer! That's a cool explanation :)) I never saw that and it got me thinking...
Cheers, Luka.