This article will discuss the dating formula in the Dadanitic inscriptions. So far, some of these have been interpreted to refer not only to the reign of the local king (mlk lḥyn), but also to another political official called rʾy. The article will discuss the merit of this interpretation based on both the questionable etymology of the term rʾy and the problematic interpretation of the terms following this word as personal names. Instead, a new interpretation of this formula as a reference to a local calendar will be explored in light of the occurrence of a similar word rʾy in Safaitic dating formula, and comparison to other ancient methods of time reckoning in the region.