The Swatch Once Again Watch

We own an Apple Watch. It has a lot of capability, but sometimes it’s too complicated. So we bought a Swatch Once Again watch ($55 at Amazon). It has a calendar. At the moment it shows Sunday (correct) and a date of 4 (incorrect; it is 27). We would like to correct the date, but it is impossible to pull out the stem (and we don’t want to break it).