https://en.wikipedia.org/wiki/Juche_calendar
The Juche calendar, named after the Juche ideology, is the system of year-numbering used in North Korea.. The Juche calendar begins with the birth of Kim Il-sung, the founder of North Korea.His birth year, 1912 in the Gregorian calendar, became "Juche 1" in the Juche calendar. The calendar was adopted in 1997, three years after the death of Kim Il-sung