The Juche calendar was introduced in 1997 and is based on Kim Il-sung's date of birth: 15 April 1912. This year is used as Juche 1 and the system works forward from there. There is no Juche 0. The Juche calendar does maintain the Gregorian calendar's traditional months and the number of days in a month. Hence, to calculate the Juche year from a Gregorian year after 1912, simply subtract 1911.
In many instances of non-Korean usage the Juche year is given after the corresponding Gregorian year i.e. 12 June 2007 (Juche 96). However, most official DPR-Korean sources list the Gregorian year second as in 12 June Juche 96 (2007).