Crack open the .package and see if the date comes up as the current date or 1900 (a package file is basically just a zipped project... double clicking it should make Designer try and open it)
My build is greater than yours so you'll probably get an upgrade warning... still try and open it. It might not be able to open up though.
If opening it doesn't work, could you describe the setup of your datepicker with screenshots or similar?