《晋书·志·第七章》
以月数、月余各自乘以积合，得到积月和新的月余，如果新的月余大于等于合月法，减之，同时积月加一，差敷为最后的月余。
以月数、月余各乘积合，满合月法从月，不尽为月余。以纪月去积月，余为入纪月。
Multiply the number of months and the remainder of the month by the cumulative conjunction respectively, and get the cumulative months and the new remainder of the month. If the new remainder of the month is greater than or equal to the law of the conjunction month, subtract it, and add one to the cumulative month at the same time. Subtracting the results is the final remainder of the month.