Adjustment date Portuguese Perpetual Calendar

I have the limited edition of the portuguese perpetual calendar watch.
As I was changing the date I made a mistake and changed the date 1 day to early. It has to be december 31 2012 but it's now january 3 2013.
Can somebody tell me how I can change it back to december 31?

Thank you

Unfortunately, not. You need to let the watch wind down by not wearing it, and eventually stop. Then wait until the 4th of January, set it, wind it and you should be set.