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In other places, however, the IDL deviates east or west away from that meridian. Aleutian Islands (Attu Island being the westernmost) and the Commander Islands, which belong to Russia. Thus, all of Russia is to the west of the IDL, and all of the United States is to the east except for the insular areas of Guam, the Northern Mariana Islands, and Wake Island.These various deviations generally accommodate the political and/or economic affiliations of the affected areas. The IDL remains on the 180° meridian until passing the equator.
Conventionally, the IDL is not drawn into Antarctica on most maps.The International Date Line (IDL) is an imaginary line of navigation 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.It passes through the middle of the Pacific Ocean, roughly following the 180° line of longitude but deviating to pass around some territories and island groups. (Times are approximate, since time zone boundaries generally do not exactly coincide with meridians.(See § Cartographic practice and convention below.) A person who goes around the world from east to west (the same direction as Magellan's voyage) would gain or set their clock back one hour for every 15° of longitude crossed, and would gain 24 hours for one circuit of the globe from east to west if they did not compensate by setting their clock forward one day when they crossed the IDL.In contrast, a west-to-east circumnavigation of the globe loses an hour for every 15° of longitude crossed but gains back a day when crossing the IDL.
For example, at UTC Thursday, it is Wednesday in American Samoa (UTC−11), Thursday in most of the world, and Friday in Kiritimati (UTC 14).