International Date Line
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}. [Webster 1913 Suppl. +PJC]

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. [Webster 1913 Suppl.]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • International Date Line — Date line redirects here. For other uses, see Dateline (disambiguation). The International Date Line around 180° The International Date Line (IDL) is a generally north south imaginary line on the surface of the Earth, passing through the middle… …   Wikipedia

  • international date line — n. [often I D L ] 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 …   English World dictionary

  • International Date Line — n [singular] an imaginary line that goes from the ↑North Pole to the ↑South Pole, to the east of which the date is one day later than it is to the west …   Dictionary of contemporary English

  • International Date Line — ► NOUN ▪ an imaginary North South line through the Pacific Ocean, chiefly along the meridian furthest from Greenwich, to the east of which the date is a day earlier than it is to the west …   English terms dictionary

  • International Date Line — noun an imaginary line on the surface of the earth following (approximately) the 180th meridian • Syn: ↑dateline, ↑date line • Instance Hypernyms: ↑meridian, ↑line of longitude * * * noun the international date line …   Useful english dictionary

  • International Date Line — a theoretical line following approximately the 180th meridian, the regions to the east of which are counted as being one day earlier in their calendar dates than the regions to the west. Also, date line. * * * Imaginary line from the North Pole… …   Universalium

  • international date line — The Greenwich antimeridian, or 180° longitude. The international date line, however, does not follow the Greenwich antimeridian exactly but is distorted to place inhabited areas definitely on one side or the other of the line to avoid a… …   Aviation dictionary

  • international date line — tarptautinė demarkacinė paros laiko linija statusas T sritis Gynyba apibrėžtis Linija, apytiksliai sutampanti su 180 laipsnių dienovidiniu (priešingas Grinvičo dienovidiniui) ir aplenkianti tam tikras gyvenamąsias teritorijas. Kertant šią liniją …   NATO terminų aiškinamasis žodynas

  • international date line — The line coinciding approximately with the anti meridian of Greenwich, modified to avoid certain habitable land. In crossing this line there is a date change of one day. Also called date line …   Military dictionary

  • International Date Line — In′terna′tional Date′ Line n. hor a theoretical line following approximately the 180th meridian, the regions to the east of which are counted as being one day earlier in their calendar dates than the regions to the west …   From formal English to slang

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