It can only be changed by using a watch face with shows the date on dd/mm format... Or, if you are feeling specially determined, download watchface tools, download the watchface you want, edit it, re-pack it, and re-sync.
I am an electronic drummer, and I want that huge sound from Bonzo's kit. Does anyone here know how I could get drum samples or a very similar sound to what he used? For reference, I have a Roland TD-17 drum module.