When the compilation of this document was completed is known from the following two items: (1) the description of national mourning events on the same day of June, in "Honcho Gatsuryo," and (2) a comparison of the documents referred to in "Honcho Gatsuryo" and those in "Seiji Yoryaku."
本書の成立時期について、①『本朝月令』六月同日国忌事条と、②『本朝月令』と『政事要略』に引用される典籍の比較によって分かる。