In "Gyokuyo" and "Sankai Koryo Nukigakiyo" [an excerpt from "Sankaiki"], journals from the same period, it is mentioned that he was appointed as Seii Taishogun on January 15th, which is more widely accepted now).
同時代の日記『玉葉』『三槐荒涼抜書要』〔『山槐記』の抄出〕では1月15日に征東大将軍就任となっており、近年ではこちらの説が有力）。