Between the wife an I We have a reservation for the month of March in Florida. March has 31 days she says we leave on the 31 before check out time about 11 o'clock. I say we leave on April ...
At our summer campground, a month's stay means if you check in on the first, you check out on the first the next month. If you check in on the 15th, you check out on the 15th.
But I've been at campgrounds that don't use that same method. . . a month may mean 30 days and they count the days. So check with the campground as to your exit date.