Depends on what's running on the server hosting the forum.
Some systems have a complete table that can adjust the offset from GMT for any location, and users can enter their location and all the offsets adjust for local daylight savings time rules based on the user's location.
Others only adjust for daylight savings time where the server is located, and everything else simply has a standard offset based on timezone and nothing else.
If that's the case with this server, you'll see the server clock adjust when the clock reaches 2am Sunday in whatever timezone the BYC server is located in, and you'll be an hour off until then.
Edit: Looks like this server only supports basic offsets. If you want the time to show up correctly between now and Sunday, you can go into your user profile and change your offset manually by one hour, and then change it back on Sunday.