The International date line is important because it helps tell what time it is across different time zones.
The International date line:
- Divides the world into two such that one side is ahead of the other temporally.
- Located on the opposite side of the Prime Meridian
The Earth rotates around the sun which means that some areas will see the sun before others and therefore would be ahead during the day.
There is therefore a need to know the time it is in an area based on when the sun hits that area. This is the purpose of the international date line - by dividing the Earth in two, we are able to know which point to start counting the relative hours from.
In conclusion, the International date line allows for humans to tell the time according to what timezone they are in.
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