Introduced in 2012 for those continually travelling the globe, the Sky-Dweller remains the most complicated watch that Rolex manufactures. Featuring the Sauros annual calendar and Ring Command system, it simultaneously indicates two time zones, as well as the date and month, and allows them to be adjusted with simple and tactile gestures. As an annual calendar, the Sky-Dweller recognises which months have 30 and 31 days and need only be adjusted once a year, at the end of February.