The date of the text has been narrowed down to 220–420 CE (Yan Dunjie) or 280–473 CE (Wang Ling) through internal evidence (= taxation systems assumed in the text).
A data do texto foi acoutada entre os anos 220–420 (Yan Dunjie) ou entre os anos 280–473 (Wang Ling) a través de evidencias internas (sistemas de taxación asumidos no texto).