timezone question

Can punBB be easily modified so the 'default' timezone is different to the server timezone.

i.e. the server is at GMT +8.00, but I want times to be displayed as GMT +10.00 unless a user is logged in with their own timezone settings.

also: can the setting for people who havn't set their timezone (i.e. have it set as +00 - we're all in australia, so nobody will actually be at GMT), be set to a specific timzone (+10.00) - a 'default' timezone, for new users.

thanks!