the syntax -how to output recent date and time to log file of the date command is like this:

echo "firewall started on: $(date '+%Y-%m-%d_%H-%M-%S')" >> /var/log/firewall.log

other examples:

date '+%Y-%m-%d-%H:%M:%S'
# or
echo $(date '+%Y-%m-%d-%H:%M:%S')

# create a file like 2022-02-01-filename.txt
touch $(date '+%Y-%m-%d')-filename.txt

# tar gz backups automatic date named name datum
tar fcvz $(date '+%Y-%m-%d')-projectname.tar.gz ./projectfolder

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