In server: (local)filetime 12:00
Winscp 3.7.6 - 4.1.6 & Windows in summertime: 13:00
Winscp 3.7.6 - 4.1.6 & Windows in wintertime: 12:00
Winscp 3.7.4 - 3.7.5 & Windows in summertime: 12:00
Winscp 3.7.4 - 3.7.5 & Windows in wintertime: 11:00
Problem was tested in both XP and Vista. Windows timezone used was "(GMT+2) Helsinki,...".
Both scp and sftp are affected. When copying files to remote server winscp tries to keep the modification time. The shown value is the same but the real value in the server is affected by this one hour problem. That makes determining "newest files" problematic when part of the transfers are not done with winscp.