Digital clocks have an oscillator circuit in them. If the clock is an AC wall or desk clock or even an appliance like a microwave they use the 60 Hz or 50 Hz line frequency for that time.

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The oscillator is typically a very stable circuit that maintains a precise frequency.

Why do digital clocks lose time. 01212014 1009 AM. The error comes into play when components used in building the circuit have sloppy tolerances or the mfg has a loose tolerance for time accuracy. - Digital clocks use a high frequency oscillator to divide down and create a time beat to run the clock.
You really need to slow down.

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