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You may have to change the time on your clock for many reasons. The most common is probably daylight saving. Clocks may be a little fast or slow, eg. gains a second every 24 hours. Also some old-fashioned clocks may need to be winded regularly for the clock to work, and if you forget, it is taken for granted that you would like the correct time. Also, if, for example, your school bell times are important, you may change your clock to reflect the time of the bells.
The only clock which doesn't need changing clock time is the atomic clock, because what it does is it measures some things in the air (octo-something) and it performs a complicated mathematical equation to figure out exactly what time it is.

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15y ago

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