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The International Date Line.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physical Geography) (often capitals) short for International Date Line
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
n., v. -lined, -lin•ing. n.
1. a line at the beginning of a news dispatch, giving the place of origin and usu. the date.v.t.
2. to furnish (a news story) with a dateline.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Dictionary of Military and Associated Terms. US Department of Defense 2005.