I'm not able to recreate any time issues with 7Zip
FTP is trickier. because it depends on the FTP server. because almost none of the is following the standard way of showing date/time
So some FTP server send the time in a format that the client can not parse, and then you get 00:00:00, Problem is that there are almost as many formats that there is brands of FTP servers.
MC support the most common once.
BUT I can say if this is the issue you have or not.