'Sunset' in the Bible

but at the place where the Lord your God chooses to establish His Name (Presence), you shall sacrifice the Passover [lamb] in the evening at sunset, at the time that you came out of Egypt.

You shall certainly restore the pledge (security deposit) to him at sunset, so that he may sleep in his garment and bless you; and it will be credited to you as righteousness (right standing) before the Lord your God.