The same thing happened to me. We have a split stay, and with each new check-in, our 60 day mark fell on the week-end. Both times I was able to do my FP's a day early. Each time I was planning to do them the night before (11:00 one night, 12:00 the next time - Central Time) However, with one I checked the site at 8 pm, and with the other one around 9 am, and when I went to the calendar for my FP selection..........my dates were open! I had checked the calendar the day before, on each time, and both times I still had 2 days left.