The International Date Line is an imaginary line that runs across the surface of the Earth at 180° longitude. Because this longitude is diametrically opposite to that of the Greenwich meridian, it results in a difference of 24 hours on crossing the line.
To avoid the confusion of having different dates (difference of 24 hours results in the changing of date) in the same country, the International Date Line has been outlined according to the international agreement. This is why the International Date Line bends and goes zigzag at the Bering Strait (between Siberia and Alaska), Fiji, Tonga, and some other islands.
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