After a restart of the Smoothwall Filter and Firewall, the time is always incorrect. This usually happens when the system time has been manually set in the BIOS during British Summer Time (BST). The Smoothwall automatically already adjusts for BST, and so in this instance will also add an additional hour, leading to the incorrect time to show on the system.
During the next reboot, set the BIOS clock to the correct non-summertime time, then the issue should disappear. As a general rule, set the Smoothwall BIOS time to the GMT time. The Smoothwall regulates the clock automatically, based on you timezone settings configured in the administration user interface page System > Preferences > Time. See our help topic, Setting the system's time and providing a time service.