You will need to change your times for your accounts to do this:
* Enter your control panel by clicking 'My Controls' at the top of a page on the forum.
* Click 'Board Settings' near the bottom of the menu on the left.
* Click the box next to 'Is daylight savings time in effect?' so it contains a tick.
* Click 'Change my Account Options' at the bottom of the page to save your preferences.