How Can Samoa Hop Over the International Date Line?

A bill written by the Prime Minister of Samoa's Cabinet and approved by its Parliament will soon send Samoa to the other side of the International Date Line, an imaginary line that defines when one calendar day begins and the other ends.

The change, to take effect on December 29, won't shift the time of day in Samoa -- after all, the sun will still rise and set as it did before; instead it will move the calendar one day forward. Next year, 12 pm on a Tuesday in Samoa (west of the date line) will be 12 pm on Monday in American Samoa, an island 80 miles to the east that plans to remain east of the date line.

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Natalie Wolchover

Natalie Wolchover was a staff writer for Live Science from 2010 to 2012 and is currently a senior physics writer and editor for Quanta Magazine. She holds a bachelor's degree in physics from Tufts University and has studied physics at the University of California, Berkeley. Along with the staff of Quanta, Wolchover won the 2022 Pulitzer Prize for explanatory writing for her work on the building of the James Webb Space Telescope. Her work has also appeared in the The Best American Science and Nature Writing and The Best Writing on Mathematics, Nature, The New Yorker and Popular Science. She was the 2016 winner of the  Evert Clark/Seth Payne Award, an annual prize for young science journalists, as well as the winner of the 2017 Science Communication Award for the American Institute of Physics.