You can set your local time as an offset to the standard time determined by the server the forum is run on.
To configure your time offset, click on the "Profile" link on top, then "Modify Profile" followed by "Look and Layout".
Click on "auto detect" to match the time offset you your local ISP's time zone. If you do not receive, after an automatic page refresh, a green "Profile Changed" message on top of the profile settings, you may have to save the changes manually by clicking the "change profile" button on the bottom right.