Analog clock with digital display
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Some old-fashioned clocks with digital displays really keep track of the time in an analog fashion.
The electric motor turns two wheels continuously: the faster at a rate of 1 revolution per hour, the slower at a rate of 1 revolution per 24 hours. The wheels move continuously, not in steps.
The wheels are connected to rings of flat plastic "leaves" that have numbers printed on them. As as new one flips over each minute, it changes the appearance of the clock to give the correct time to the latest minute.
This type of clock is commonly referred to as a "flip clock."
[edit] Daylight Saving Time
Analog clocks with digital displays cannot be wound back, as the flip mechanism operates only in one direction. Instead they must be wound forward 23 hours to achieve the effect of winding back 1 hour at the end of daylight saving time.
