Just wanted to say that even if the topic isn't solved I found a way around the problem by hiding or not showing the year to reactivate in the profile when asking a member to renew next (this current) calendar year.
As far as I can see it has nothing to do with what time zone I'm in but instead the fact that when the system gets the information about the subscribtion it fails to add (+1) when the calender year is retreived from the database and the date has passed new year and a new calendar year has started.
It's a bit clumsy to not printing the year but it seem to work.
If someone else has the same problem...