According to the Oriental zodiac of the year of the demise described in Kojiki (The Records of Ancient Matters), the demise of Emperor Ojin was in 393 and the demise of Emperor Nintoku was in 427, the difference corresponding to the period of the reign.
古事記の干支崩年に従えば、応神天皇の崩御が西暦393年、仁徳天皇の崩御が西暦427年となり、その間が在位期間となる。