Subject: date man page

From: t0th <[email-masked]>
Date: Fri, 13 May 2022 16:10:44 -0300

Man page of date command should make explicit that -d and -r options are
mutually exclusive.

date -d -3 minutes -r tmp.txt "+%Y%m%d_%H%M"
date: the options to specify dates for printing are mutually exclusive