If you ever made backups from command line, you’d probably wanted to do this on a regular basis, including date and time of your backup (e.g. to keep backups for a week or so). Here is a simple command, that will allow you to do this:
mysqldump -h host -u user -p password database_name > backup_$(date "+%b-%d-%Y-%H-%M-%S").sql
You can specify your own format by adding or removing date parameters. This command will give you something like Feb-24-2016-12-12-13.