If you wish to, you can manually edit the vars_time.cgi file. There may be a value in the file called "FudgedOffset" - adjust it by the number of seconds that you wish to change the time by.
However, this may cause unintended side effects, and I would not advise doing it. Waiting the additional week for the rest of the world to catch up isn't so bad. <img src="https://www.ubbcentral.com/boards/images/graemlins/smile.gif" alt="" />