Implementation of modtime command

[chanunnaki]

When I try to use the command modtime on the FTP server, I get the following warning:
502 Sorry, command not implemented. :(

Is it actually not implemented? or is there something wrong?

modtime " Shows the last modification time of the file on the remote machine."

I'm trying to make a rudimentary syncing server that could use modtime.

[aktau]

Reading appears to work, at least in the sense that lftp mirror generated files on my local hard-drive that have the same mtime/ctime. But indeed writing doesn't seem to work. This is unfortune, since it means bidirectional syncing needs hacks, if one wants the latest written file to survive always.

EDIT: This seems to be the corresponding libftpvita issue: xerpi/libftpvita#30.