Listing of files via FTPS shows incorrect file dates

It seems all the files listed while WinSCP is connected to an FTPS server (Sterling Integrater 6.1.2.1) show their dates as one day in the future. Logging onto the same server via SFTP with WinSCP, the dates are correct. Trying several other FTPS clients, they all show the correct dates. Using WinSCP 6.1.1 or 6.1.2.

Please attach a full session log file showing the problem (using the latest version of WinSCP).

The log won't help. When I added a file today to a directory (on 10/12), I end the session and the log that was created for the session by WinSCP shows the directory listing with the correct date. Meanwhile, while I was actually looking at the GUI display immediately after the transfer via FTPS, it showed the file date as 10/13 (tomorrow!). I ended the first session to get the log. If I open another FTPS session, it still shows the wrong date in the GUI. The log for the second session also still shows the date correctly. After a while, I might come back and it might finally display correctly in the GUI. This happens intermittently and is hard to reproduce. Viewing the same directory with SFTP, it is always the correct date. The server is Sterling Integrator that allows looking at the same file using several different transfer protocols.