How do computers/mobiles/tablets know the time even when they’re switched off and not connected to the internet?
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They have clocks in them, just like an electronic wrist watch. Those clocks still keep time even when the device is turned off. A tablet or other mobile device probably still uses the main battery for this, but a computer usually has a small watch battery on the motherboard to maintain this power.
Computers, laptops, phones, and tablets still have a small circuit that’s on, even when they’re off. This circuit is basically responsible for keeping the clock running. On desktop computers, this is typically powered by a CR2032 battery on the motherboard. On laptops, smartphones, and tablets, this is often a rechargeable battery that is smaller than the main battery.
What the actual source of the (seemingly universal) “correct” time?
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