date line

American  

noun

1. International Date Line.

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date line British  

noun

1. (often capitals) short for International Date Line

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date line Scientific  

/ dāt /

1. The International Date Line.

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Etymology

Origin of date line

First recorded in 1875–80

Example Sentences

The short answer is that Mondays become Tuesdays at the international date line, a boundary that runs through the Pacific Ocean.

From New York Times • Apr. 24, 2024

The longer answer is that no international rules govern the location of the date line, and its exact coordinates depend on the shifting whims of governments.

From New York Times • Apr. 24, 2024

DSV said it came upon the image’s location based on the 2010 “Date Line Theory,” which suggests Earhart’s exhausted navigator forgot to turn his calendar back a day after crossing the international date line.

From Seattle Times • Jan. 29, 2024

The position of the international date line meant hitting a ball into right field was hitting it into the next day.

From Washington Post • Apr. 30, 2022

The date line was Greenwich, Connecticut, and it stated that two children of Mr. and Mrs. Steven C. Kincaid, Sr. had been missing since Wednesday.

From "From the Mixed-Up Files of Mrs. Basil E. Frankweiler" by E.L. Konigsburg