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. In other places, however, the IDL deviates east or west away from internasjoonal meridian. Lawrence Island and St. The Onternasjonal crosses between the U. Aleutian Islands Attu Island being the westernmost and the Commander Islandswhich belong to Russia.
Thus, all of Russia is to the west of the IDL, and all internasjona, internasjonal dating laukaa United States is to internasjomal east except for the insular areas of Guam, the Northern Mariana Islands, and Wake Island. Two US-owned uninhabited atolls, Howland Island and Baker Islandjust north of the equator in the central Pacific Ocean and ships at sea between Accordingly, Samoa, TokelauWallis and FutunaFijiTongaTuvalu and New Zealand's Kermadec Islands and Chatham Islands are all west of the IDL and have the same date.
American Samoa, the Cook IslandsNiueand French Polynesia are east of the IDL and one day behind. It follows that meridian until reaching Antarcticawhich has multiple time zones. Conventionally, the IDL is not drawn into Antarctica on most maps. The IDL must therefore be observed in conjunction with the Earth's datijg zones: For the two hours between For example, at During the first hour UTC During the second hour UTC These include portions of the Republic of Kiribati internasjonao, including Millennium Island in the Line Islandsas well as Samoa during the southern summer.
As a result, this atoll was renamed Millennium Island. The areas that are the first to see the daylight of a new day vary by the season. At the equinoxesthe first place to see daylight would be the uninhabited Millennium Island in Kiribati, which is the easternmost land located west of the Internasjonal dating laukaa. These include Amundsen-Scott South Pole StationMcMurdo StationScott Base and Mario Zucchelli Station.
There are two ways time zones and thereby the interjasjonal of the International Date Line are determined, one on land and adjacent territorial watersand the other on open seas. All nations unilaterally determine their standard time zonesapplicable only on land and adjacent territorial waters. This date line can be called de facto since it is not based on internasjonal dating laukaa law, but on national laws.
These national zones do not extend into international waters. The nautical date linenot the same as the IDL, is a de jure construction determined by international agreement. It is the result of the Anglo-French Conference on Time-keeping at Sea internaskonal, which recommended that all ships, both military and civilian, adopt hourly standard time zones on the high seas. The United States adopted its recommendation for U. This date line is implied but not explicitly drawn on time zone maps.
In reality, ships use these time zones only for radio communication and similar purposes. For internal purposes, such as work and meal hours, ships use a time zone of their own choosing. The IDL on the map on this page and all other maps is based on the de facto line and is an artificial construct of cartographers, as the precise internasjonal dating laukaa of the line in international waters is arbitrary.
The IDL does not extend into Antarctica on the world time zone maps by the United States Central Intelligence Agency CIA  or the United Kingdom's Her Majesty's Nautical Almanac Office HMNAO. The current HMNAO map does not draw the IDL in conformity with recent in the IDL; it draws a line virtually identical to that adopted by the UK's Hydrographic Office internasjonal dating laukaa No international organization, nor any treaty between nations, has fixed the IDL drawn by cartographers: The conference resolved that the Universal Day, midnight-to-midnight Greenwich Mean Time now known as Coordinated Universal Time, or UTCwhich it did agree to, "shall not interfere with the use of local or standard time where desirable".
As part of New Spainthe Philippines long had its most important communication with Acapulco in Mexico and was accordingly on the internasjoonal side of the IDL despite being at the far western edge of the Pacific Ocean. From tointernasjonal dating laukaa Philippines was one day behind its Asian milf dating free keski suomi was the first European visit, when Ferdinand Magellan claimed the area for Spain.
Colonization began in After Mexico gained its independence from Spain inPhilippine trade interests turned to Imperial Chinathe Dutch East Indies and adjacent areas, so the Philippines decided to shift back to the west side of the IDL by removing Tuesday, 31 December from its calendar. Effective Wednesday, 1 Januarythe Philippines, Guam, Mariana Islands and Caroline Islands switched back to Asian date. Western publications were generally unaware of this change until the early s, so erroneously gave the International Date Line a large western bulge for the next half century.
The Russian Empire settled northwest North America from Siberiafrom the west with its own Julian calendar it did not adopt the Gregorian calendar until The United States purchased Russian America while based in the contiguous United Statesfrom the east with its own Gregorian calendar adopted in while several British colonies. Senator Charles Sumner stated during his three-hour ratification speech an encyclopedic discussion of Russian America on Tuesday, 9 Aprilthat this day of the internasjonal dating laukaa and calendar discord should be changed.
Sitka mean solar time time zones were not yet in use that was internasjonal dating laukaa date and time that Alaska changed from an Asian and Julian date to an American and Gregorian date. If the transfer had occurred at the preceding midnight then Friday, 6 October Julian would have been followed by Friday, 18 October Gregoriana duplicate day with a day difference appropriate both for changing from an Asian date to an American date equivalent to moving the IDL from the east to datint west of Alaska and for changing from internasjomal Julian calendar to the Gregorian calendar during the 19th century.
The Samoan Islandsnow divided into Samoa and American Samoawere on the west side of the IDL until