(1) The server is set to GMT (UTC) time .... the date and time it is in Greenwich, England.
(2) Your computer is also set to a time with a GMT offset ...
(3) In your profile, you can set a time correction to GMT ...
(4) It seems the "Autodetect DST" function doesn't work.
If you don't have 2, 3 and 4 set correctly - the time of your post will be off.