It is not well known when this book was compiled, but judging from the fact that the Emperor Ichijo was referred to as "the present emperor" in the text, it is considered to be edited during the Emperor Ichijo's reign.
本書の成立年代は詳らかではないが、本書のなかに一条天皇を「今上」と記していることから一条天皇の朝に行われたと考えられる。