What is "datebooks"

Usage examples of "datebooks".

The rest of the material the box contained --the diaries and datebooks, the notes for unfinished novels, the variant drafts of his late plays, and so forth--has long since been made available to James scholars, first in the form of selections under the editorship of F.

And then one night, in April of 1979-- - April 21st, to be exact, a date which I tore out of my datebooks for the next few years--- I was waiting for her outside a movie theater and she failed to show.