Was the Beginning Day of the Maya Month Numbered Zero (Or Twenty) or One

Goodman, in his elaborate and valuable book on the Maya Inscriptions, has made up his Tables on the supposition that the beginning day of the month was not called Day 1, but Day 20, giving the day this number because in his view the Mayas counted the number of days which had passed and not the current or passing day. That is, the Mayas, according to Goodman, used the same plan in counting their days which we use in counting our minutes and hours and which we depart from in counting our days.