The Hebrew word used for day, in Genesis, has multiple meanings. There is no way to tell which meaning God meant, since the word day, (Yom), has multiple meanings.
Not true. God was very specific that an evening and morning was the first day and each day after that was the same term, and evening and morning to denote a night and day. In Exodus 20, He repeats the same thing in the 10 Commandments. God went to great lengths to emphasize each day was a 24 hour period. It is true that in various places in Scripture that you might read a week of years, or a week of days, but Creation was 7 individual days. Any rabbi would verify this.
Oh, I get it now. Everybody who accepts the scriptures and the Creation account, as written, including the Hebrew prophets, including Christ our Savior Himself; not to mention the Apostles and Church Fathers and our Founding Fathers, chose the incorrect meaning upon which to base their Doctrine. Scazzaaamm! That cleared it right up. And kudos to that NYC singer for setting us straight. Wow! I feel educated now. Thanks a dozen.
This is why Genesis told us what God meant. "It was evening and morning, the first day."