Set the system's date from a remote host

Current version:

Homepage: https://www.aelius.com/njh/rdate/

Formula history

ilovezfs rdate: use server with RFC 868 support in the test (#8611)
Viktor Szakats rdate: use https homepage
Baptiste Fontaine rdate: use an https url
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages
Baptiste Fontaine rdate: test added