It is down to the relative position of the Sun so where you are on the globe the Sun would rise at a different time, so to keep everything relatively balanced and no one having sun rise at midnight, there are time zones around the planet where the time changes by an hour as you cross the imaginary line between time zones. However when you go completely round the planet the time zones meet up again at the same time, but the problem is that each time zone was adding an hour to the time the final zone is now 24 hours ahead of the next one so you have the international date line as the final time zone moving from one day to the next.
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