Did you know that the concept of a zero place value did not get introduced to the West until around the 12th century?
That is why, for example, the Bible tells us Jesus was in the tomb for 3 days.
Good Friday is Day 1, Saturday is Day 2, Easter Sunday is Day 3.
In today's day in age, we would have counted Saturday as Day 1 because we use a zero place value for the current day.
I know, I know, "Thanks for 'nothing', Michael."