Of course they are, but by default, it won’t work the same way with the built-in date command of *BSD, macOS and probably a few others (Windows? Plan 9?). If yo

Of course they are, but by default, it won’t work the same way with the built-in date command of *BSD, macOS and probably a few others (Windows? Plan 9?). If you need it just for this one command, my tool is a smaller additional installation than the GNU environment; alternatively, one could just remember all of the four-or-so different syntaxes... Plus, the date command mostly doesn’t parse words properly. ;-)