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Computers have a built-in back-up battery - similar to a 'button cell' in a watch - only larger. While mains power is present, it simply does nothing. Once mains power is disconnected, the back-up battery maintains the computer's internal clock until power is restored. If your computer is failing to keep the time when you experience a power-outage - you need to replace back-up battery.

It's possible to do it yourself if you feel confident enough. However - if you're 'poking around' inside the computer's case - remember to wear an antistatic wrist band !

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Q: Why would a computer not retain set time and date when there is power outage?
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