Good question! After the summer time change it seems we are now +3 so it would be 23:00 Finnish time. The auction could be extended because of the 5 minute bidding rule but anycase, 23:00 Finnish time.

The end time of 20:00 is based the forum time which you can see in the top right corner of the forum, at all times. To be specific it's 8 PM forum time. From there it's easy to verify when the auction is ending.