ftp mdtm: invalid command

[Felipe G. Nievinski]

Greetings.

Thank you for the excellent inetutils.

I'm using the FTP utility, which supposedly supports the MDTM command (as per section 21.1 Standards of the documentation):

https://www.gnu.org/software/inetutils/manual/inetutils.html

However, when I try mdtm, it complains: "invalid command".

For testing purposes, I've used the quote command:

    quote "mdtm myfilename.ext"

which returns a timestamp correctly.

ftp> mdtm 20230518T213000Z.gps.new
?Invalid command

ftp> quote "mdtm 20230518T213000Z.gps.new"

213 20230521012942

So, the server recognizes the command correctly.

Am I missing something?

Thank you!

-Felipe.