For example, on the server, right click -> properties reports a file's m-time as Dec. 9 2005 02:32:18 AM. The same file on the laptop reports its m-time in properties as Dec. 9 2005 03:32:18 AM. Both server and client have adjusted for daylight savings and agree on the current time. I can try any of the three daylight savings adjustment options in the WinSCP configuration, but the timestamps are always off by an hour from each other, whereas before the daylight savings switch the timestamps apparently agreed (since the synchronization didn't want to re-copy the example file then).
Maybe the easiest way to address the issue would be a WinSCP option to locally (on the client) adjust all server-reported m-times by + or - N (or 0.5N) hours for synchronization purposes. That would also take care of desynchronization between time zones.
In the meantime, is there any way to make this "just work"? Because otherwise I think my only option is to write a script to go through and manually adjust the m-time by an hour on every single file.