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international date line

The international date line is an imaginary line that goes north and south through the Pacific Ocean, one day is on the east side of the line and the following day is on the west side. (noun)

An example of the international date line is when it's 3pm on Sunday in Samoa, it's 3pm on Monday right across the line, just 550 miles away in Tonga.

See international date line in Webster's New World College Dictionary

an imaginary line drawn north and south through the Pacific Ocean, largely along the 180th meridian: at this line, by international agreement, each calendar day begins at midnight, so that when it is Sunday just west of the line, it is Saturday just east of it

See international date line in American Heritage Dictionary 4

noun

An imaginary line through the Pacific Ocean roughly corresponding to 180° longitude, to the east of which, by international agreement, the calendar date is one day earlier than to the west.

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International Date Line

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