Related to zonetime: Timezone
The standard time throughout a time zone that is the actual time at the meridian on which the time zone is based.
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) the standard time of the time zone in which a ship is located at sea, each zone extending 7° to each side of a meridian
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014