Superb, I love christmas :). You have to set the year to 2007 to work. You can edit in widget properties. I think the timezone it's the same set to your pc clock so you have to change the pc clock.
I'm sorry to say that once I downloaded this widget, the timer was not working. I use an XP platform on a PC, and an uninstall/re-install didn't fix the problem. My friend, however, who uses a Mac (as should I!) downloaded and used this widget without any difficulties whatsoever. It's lovely; I wish I could use it!