Ok, I have done what you said, and I've managed to to prevent future dates from being selected. However, I entered in 1950, as the min date, but it has no effect on the calendar - see attached.
Just for the hell of it, I changed the MaxDate from 0 to 2014, and when I loaded the page, the future dates went up to 2018- not 2014 as expected.
Am I not getting something?