The International Date Line can be defined as an imaginary line of demarcation on the surface of the earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next.
If the line was straight, then it could pass through some territories and island groups. This will result in the increase of a day on the same island and a country which would create a massive confusion among the civilians. To prevent this confusion, the line is deviated roughly following the 180° line of longitude.
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Answer:
The International Date Line can be defined as an imaginary line of demarcation on the surface of the earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next.
If the line was straight, then it could pass through some territories and island groups. This will result in the increase of a day on the same island and a country which would create a massive confusion among the civilians. To prevent this confusion, the line is deviated roughly following the 180° line of longitude.