In order to ensure consistency with those of his books, dates will be shown based on a lunar calendar (except for the year, month and day of birth and death) and gengo (an era name) during the period of Northern and Southern Courts (Japan) will be shown by those of the Northern Court.
日付は、著作との整合を保つ為、旧暦表示（性歿年月日を除く）とし、南北朝時代(日本)の元号は、北朝（京都）で表記する。