They corrected the anomaly in the eastern half of Kiribati by skipping January 1, 1995 and ever since Kiribati has been the first country to enter the New Year.
In 2011, Samoa changed the time zone from UTC-11 to UTC 13 by shifting the dateline to the west and removing December 30, 2011 from the calendar.
Depending on which time zone the country follows, the time difference on either side of the line is not always 24 hours.
For example, if you travel the 1061 kilometers (659 miles) across the dateline from Baker Island to Tokelau you have to add 25 hours, or 1 day and 1 hour.
They did this to facilitate trade with Australia and New Zealand, and Tokelau followed Samoa for the same reasons.
When you cross the International Date Line from west to east, you subtract a day, and if you cross the line from east to west, you add a day.
Carbon-14 is radioactive, with a half-life of about 5,700 years.
For more information on cosmic rays and half-life, as well as the process of radioactive decay, see How Nuclear Radiation Works.
Every day between and UTC, three different dates on the calendar are in use at the same time on Earth.
For example, our Time Zone Converter shows: The dateline is not defined by international law.
The International Date Line is located halfway around the world from the prime meridian (0° longitude) or about 180° east (or west) of Greenwich, London, UK, the reference point of time zones. The dateline runs from the North Pole to the South Pole and marks the divide between the Western and Eastern Hemisphere.