The Collaborative International Dictionary
Date line \Date line\ The hypothetical line on the surface of the earth fixed by international or general agreement as a boundary on one side of which the same day shall have a different name and date in the calendar from its name and date on the other side. Also called International Date Line.
Note: Speaking generally, the date line coincides with the meridian 180[deg] from Greenwich. It deflects between north latitudes 80[deg] and 45[deg], so that all Asia lies to the west, all North America, including the Aleutian Islands, to the east of the line; and between south latitudes 12[deg] and 56[deg], so that Chatham Island and the Tonga group lie to the west of it. A vessel crossing this line to the westward sets the date forward by one day, as from Sunday to Monday. A vessel crossing the line to the eastward sets the date back by one day, as from Monday to Sunday. Hawaii has the same day name as San Francisco; Manila, the same day name as Australia, and this is one day later than the day of Hawaii. Thus when it is Monday May 1st at San Francisco it is Tuesday may 2d at Manila.
WordNet
n. an imaginary line on the surface of the earth following (approximately) the 180th meridian [syn: dateline, International Date Line]
Usage examples of "date line".
Making an OS to work on arbitrary pieces of hardware, cranked out by rabidly entrepeneurial clonemakers on the other side of the International Date Line, is very difficult, and accounts for much of the troubles people have using Windows.
His eye skipped over official heading, date line, and file number: “.
She executed the command to decrypt the message, and got gibberish, then realized (not for the first time) that Nomuri was on the other side of the date line, and had therefore used a different key sequence.
Twenty-five hundred kilometres after crossing the International Date Line, leaving Midway Island far behind them, the 747 ran into a storm filled with blue fire and precipitous air currents as it slid across the Tropic of Cancer.
It was like time zones and the date line back on Earth: not ordinarily important.
He crossed the equator and the international date line on the same day.