date·book
(dāt′bo͝ok′)n. A notebook or calendar for listing appointments, events, and other work-related or social information.
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.
datebook
(ˈdeɪtˌbʊk) nUS a notebook in which a person keeps a personal record of daily events, appointments, etc
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
date•book
(ˈdeɪtˌbʊk)
n. a notebook for listing appointments, making entries of events, etc., usu. for the period of a year.
[1960–65]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.