The default date format in version 1.6 is currently American style (month date, year). I see this is hardcoded in gbook.php on line 749 ("F j, Y").
Not all of us are American!

The normal style in the UK (and elsewhere) is date month year ("j F Y"). It would be very useful to be able to set this as an option in settings.php rather than having to change the code in gbook.php (the more you have to change gbook.php the more of a pain it is to upgrade when the time comes).
Just a suggestion from us UK users ...

Many thanks for an excellent script!
David