International Date Line
"Date line" redirects here. For other uses, see Dateline (disambiguation). The International Date Line around the antimeridian (180° longitude) The International Date Line ( IDL ) is an imaginary line of demarcation on the surface of Earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next. It passes through the middle of the Pacific Ocean, roughly following the 180° line of longitude but deviating to pass around some territories and island groups. Contents 1 Geography 1.1 Description 1.2 Circumnavigating the globe 1.3 Facts dependent on the IDL 2 De facto and de jure date lines 2.1 Cartographic practice and convention 3 Historical alterations 3.1 Philippines (1521 and 1844) 3.2 Alaska (1740s and 1867) 3.3 Samoan Islands and Tokelau (1892 and 2011) 3.4 Kwajalein (c. 1945 and 1993) 3.5 Eastern Kiribati (1994) 4 Date lines according to religious prin...