Walt Brown (Brown, 2008) has proposed that the year originally was 360 days long and had twelve 30-day months. He further proposed that within his hydroplate model significant changes in the earth and moon at the time of the Flood altered the lengths of the day and month to the current configuration. Here I evaluate this claim. From the standpoint of basic physics, his mechanism of shortening the day by 1.46% is plausible, though I don’t address the question of the geophysics involved. However, the mechanism for decreasing the size of the moon’s orbit to shorten the month has problems. Brown’s proposal of selective impacts on the leading edge of the moon as it orbited the earth is based upon a misunderstanding of orbital mechanics. There is no suitable site on the moon for the required number of impacts. Furthermore, the energy released by the many required impacts would have produced far too much heat on the moon.