International Date Line

The International Date Line is an imaginary line located roughly along the 180° longitude opposite the Prime Meridian. It serves as the marker where the date changes by one day when crossing it—traveling east subtracts a day, while traveling west adds a day. The line is accepted as the boundary to maintain a consistent global calendar, although it has deviations to accommodate political and geographic borders. Essentially, it helps keep around the world synchronized in time and date as people travel or communicate across different regions.