The Lufkan calendar was a lunisolar calendar, which ran on a 649-year cycle with 239 leap months and 126 years leap days. The years with a leap month were called long years and the years with a leap day were called leap years. 236 of the long years were arranged in a 11-year cycle of 4 leap months and the remaining three were arranged irregularly in the 649-year cycle. 118 of the leap years were arranged in the 11-year cycle and the remaining 8 were arranged irregularly in the 649-year cycle.