Nolland believes that the Greek is ambiguous, but can be read to refer to Sunday morning. "Late on Sabbath" can be read as "after Sabbath" and the "beginning of the next day" as the "dawning of the next day", and thus sunrise on Sunday. Nolland also notes that other Jewish texts from the period are also imprecise and refer to the dawn as the beginning of a new day.
Nolland thinks that the Greek phrase is unclear, but it might be interpreted to mean "Sunday morning". He also notes that other Jewish texts from the same period are similarly imprecise and use vague language to describe the dawn of a new day.