Rolex Sky-Dweller Stainless Steel Calendar Watch Rolex Swiss watches by wholesalewatches - December 29, 20150 The Rolex Sky-Dweller is an annual calendar invented in 2012.The Rolex Sky-Dweller contains the in-house Caliber 9001. The second time zone is indicated by an off-center, rotating 24-hour disk. Local time, indicated by the center- mounted hands, can be adjusted quickly when you change time zones by setting the hour