【教えて下さい】「Later that day」の意味

To exactly predict traveling time for later that day, with consideration given to the previous traveling time data of the same section of a road and to the transition of traveling time up until the day immediately before leaving.
道路区間の過去の走行時間データとともに、当日の直前までの走行時間の推移を加味して、当日の先の時刻の走行時間を正確に予測する - 特許庁
http://ejje.weblio.jp/sentence/content/%22Later+that+day%22

Two days later, he became a priest and died on that day.
その2日後に出家、同日崩御。 - Wikipedia日英京都関連文書対訳コーパス

http://ejje.weblio.jp/sentence/content/Later+that+day