There is an opinion that both the Ankan and Senka Dynasties existed at the same time and the country was in a domestic conflict just like the period of the Northern and Southern Courts (Japan), and there is also an opinion that it is just a matter of the calendar.
南北朝時代(日本)のように安閑・宣化朝と欽明朝が並立し内乱状態にあったという説や、単に暦法上の問題とする説などがある。