Blatantly untrue. (And of course appealing to history is a fallacy. In other words, if were to appeal to history we will still have to believe the Earth was at the center of the universe).
See, among others,
PCA Report of the Creation Study Committee
Creedal Controversy: The Orthodoxy of "Days"
Westminster Theological Seminary and the Days of Creation
And don't forget church "fathers" like Origen, Augustine and others also open to long days.
No, they were NOT! Augustine was insistent that it occurred instantly not over any period of time.
And the fact that tye were "open" to other interpretations does not subtract from the fact that Moses clearly intended to convey to the reader that these were 24 hour days.