International Date Line
The International Date Line is an imaginary line on the Earth's surface that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next. It is located roughly along the 180th meridian, and when crossing the line from west to east, one day is added to the calendar, while crossing from east to west subtracts one day. The purpose of the International Date Line is to avoid confusion in timekeeping when traveling across the world, especially for ships and aircraft. The line is not straight and has been adjusted over time to accommodate political and economic considerations, resulting in several zig-zags and deviations.
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