Let's say the date is set to 31st 10 2005 and I want it to go back a month. I change the month to 9 and hit [Submit]. Instead of giving me the previous month, it discovers that the 9th doesn't have 31 days and sets the range to the player's entire span. This loses any other date parts that I've set. It would be nice if it could be forgiving and just set the days to the last day of the specified month.