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http://electronics.howstuffworks.com/digital-clock.htm

A digital clock is a type of clock that uses digital electronic methods of keeping time.

Construction
Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a crystal oscillator as in a quartz clock to keep time. Most digital clocks display the hour of the day in the numerical sequence 0–23; in the United States and a few other countries a more commonly used hour sequence is 12am, 1am–11am, 12pm, 1pm-11pm (with some indication of AM or PM). Digital emulations of analog-style faces exist as well.

Displays
To represent the time, most digital clocks use a seven-segment LED, VFD, or LCD display for each of four digits. They generally also include other elements to indicate whether the time is AM or PM, whether or not an alarm is set, and so on.

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