standard time as applied at sea, reckoned according to the system of time zones.
Origin of zone time
First recorded in 1905–10
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British Dictionary definitions for zonetime
/ (ˈzəʊnˌtaɪm) /
the standard time of the time zone in which a ship is located at sea, each zone extending 7 1/2 ° to each side of a meridian
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012