Translation of "Thirty-first" in German

His death took place on June 9, 68, in his thirty-first year.
Sein Tod fand am 9. Juni 68 in seinem einunddreißigsten Jahr statt.
ParaCrawl v7.1

Yet midnight on the thirty-first will still be the same as a minute before and a minute after.
Auch Mitternacht am Einunddreißigsten wird dasselbe eine Minute vorher und eine Minute danach sein.
ParaCrawl v7.1