Code:
zip -rt 12071991 infamy foo
will add all the files in foo and its subdirectories that were last modified
on or after 7 December 1991, to the zip archive infamy.zip.
Code:
zip -rtt 11301995 infamy foo
will add all the files in foo and its subdirectories that were last modified
before the 30 November 1995, to the zip archive infamy.zip.