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(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.These include Amundsen-Scott South Pole Station, Mc Murdo Station, Scott Base and Mario Zucchelli Station.There are two ways time zones and thereby the location of the International Date Line are determined, one on land and adjacent territorial waters, and the other on open seas.A 1995 realignment of the IDL made Caroline Island one of the first points of land on Earth to reach January 1, 2000 on the calendar (UTC 14).As a result, this atoll was renamed Millennium Island.All nations unilaterally determine their standard time zones, applicable only on land and adjacent territorial waters.This date line can be called de facto since it is not based on international law, but on national laws.
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.It is the result of the 1917 Anglo-French Conference on Time-keeping at Sea, which recommended that all ships, both military and civilian, adopt hourly standard time zones on the high seas. This date line is implied but not explicitly drawn on time zone maps.The United States adopted its recommendation for U. It follows the 180° meridian except where it is interrupted by territorial waters adjacent to land, forming gaps—it is a pole-to-pole dashed line.These include portions of the Republic of Kiribati, including Millennium Island in the Line Islands, as well as Samoa during the southern summer.The first major cities to experience a new day are Auckland and Wellington, New Zealand (UTC 12; UTC 13 with daylight saving time).These national zones do not extend into international waters.