Tibet has its own calendrical systems for recording the passage of time. Traditionally, the main system for identifying years has been the sexagenary cycle, which is natively known as the “rapchung” (Wyl. rab byung). This splits time into a series of 60-year cycles beginning in 1027CE, where each year in the cycle is associated with 1 of 5 elements and 1 of 12 animals. 5 elements x 12 animals = 60 years in the cycle.
I developed a simple tool for converting a date from the Tibetan calendar into the Gregorian calendar.