With the Earth spinning around its axis once per day, the date clicks up a day at a time at midnight. If you were to travel around the world faster than the Earth's rotation, you would have time travel, so a mechanism needs to be found to stop that happening and the answer is the International Date Line. When you cross the 180-degree meridian, the date changes, either jumping forward a day - if you're travelling west - or dropping back a day - if you're travelling east. For much of its length, the 180-degree meridian is the International Date Line as well. However, in order that the jump doesn't occur over land, the date line has some wiggles, both east and west, so that the whole of any country or territory is on the same date.
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