We got caught with this a few years ago. We checked in Feb. 1st and were told we had to leave at the end of the month as we had a monthly fee. Feb. only has 28 days so we argued we should be able to stay another couple of days. They would not allow this as others were coming in for the month of March. After learning this the hard way, we started booking in on Jan. 28th - leaving Feb. 28th. For some reason, that was never an issue. Very confusing - but you do what works in your favor when you can.