@dkocher commented

I don't think it is a good idea to implement such hacks. Better fix the server.

49be198 commented

Please, upgrading the server software is NOT an option for most people. One of the main reasons I am discouraged from using Cyberduck is timezone problems. I see timezone frustrations in many other Cyberduck users too. I donated money to Cyberduck because it has been popular for many years and has a lot of potential. I think that adding compatibility features is not necessarily bad, and remember that SITE UTIME and hacking MDMT are site additions anyway, i.e., never standardised by the IETF. Perhaps I should not have called the servers "buggy". Cyberduck could implement compatibility through radio buttons:
"Upload modification times in: O UTC O Server's timezone".

49be198 commented

I have some more wishful thinking, about automatically detecting these problems. When Cyberduck uploads to a server, it re-lists the affected directory afterwards. So if it uploaded timestamps, it could compare those timestamps when the directory is re-listed. If it finds a discrepancy between the uploaded timestamp and the listed timestamp, Cyberduck could alert the user to say how many hours and minutes of discrepancy exist, with a button to open the bookmark to adjust timezone settings. Maybe you could avoid alerting the user unnecessarily by storing a value of "time drift" in the bookmark and only alert the user if the time drift has increased since last time. From a user perspective, this would be a "win", because Cyberduck would be effectively explaining what's happening and showing me how to control it.