Does a Day Begin in the Evening?
If the biblical day began at nightfall, why does the Torah need to spell out that Yom Kippur lasts “from evening to evening” (Leviticus 23:32), and that matzah is eaten “from the evening of the fourteenth” (Exodus 12:18)? The simple reading of the Creation story (Genesis 1), with morning closing each day of creation, indicates that the biblical day originally began at dawn. The requirement to begin Yom Kippur and eat matzah at night reflects a reform to begin the day at dusk.