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Single date line

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When you cross the IDL, the day and date change. If you cross it traveling westward, the day goes forward by one, and the date increases by one. If you cross it traveling eastward, the opposite occurs.

The IDL is not a matter of international law, but it's one of the few Single date line embraced globally. The IDL is crucial for global interconnectivity, instantaneous communication, time measurement and consistent international databases. It's mostly about convenience, commerce, and politics.

What's Important at Connecting Singles?

The IDL happened for much the same reasons as the emergence of the Internet — it works, and it makes life a little bit easier. Before discussing how and why the International Date Line came to be, we should first review the matter of keeping time. Back in the days before mechanical clocks, time was measured mostly using sundials. People relied on the definition that "noon" was when the sun was highest in the sky, Single date line due south.

One "day" was simply the amount of time between two consecutive "noons. The problem was, each city experienced noon at its own Single date line Depending on longitude, adjacent cities could have a time of, say, Near the equator, traveling westward by about 1, miles 1, kilometers delays the arrival of noon by one hour.

The International Date Line (IDL)...

In Single date line 19th century, the emergence of transcontinental railroads further complicated matters. That century also saw accurate mechanical timepieces becoming widely available. Travelers found themselves resetting their watches by several minutes at every station to the east or west. This was inconvenient at best.

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