But there are two widely held views that it was either completed during the Tengi era (1053-1058), when the author FUJIWARA no Akihira was in his later years, during the Kohei era (1058-1065), or the first year of the Chogen era (1028).
通説では作者藤原明衡の晩年である天喜年間（1053年-1058年）あるいは康平年間（1058年-1065年）とするが、長元元年（1028年）とする説もある。