For the two hours between and UTC each day, three different calendar dates are observed at the same time in different places on Earth.
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).
South of Kiribati, the IDL returns westwards but remains east of 180°, passing between Samoa and American Samoa.
Proceeding from north to south, the first deviation of the IDL from 180° is to pass to the east of Wrangel Island and the Chukchi Peninsula, the easternmost part of Russian Siberia. Two US-owned uninhabited atolls, Howland Island and Baker Island, just north of the equator in the central Pacific Ocean (and ships at sea between 172.5°W and 180°), have the latest time on Earth (UTC−12 hours).
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Accordingly, Samoa, Tokelau, Wallis and Futuna, Fiji, Tonga, Tuvalu and New Zealand's Kermadec Islands and Chatham Islands are all west of the IDL and have the same date.
American Samoa, the Cook Islands, Niue, and French Polynesia are east of the IDL and one day behind. It follows that meridian until reaching Antarctica, which has multiple time zones.