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Just had a thought that this may mean that what's being entered into those fields is something that the short date formatter in system preferences can't understand.

To check what your short date formatter expects to see, do the following:
Open System Preferences and switch to the International pane.
Open the Formats tab.
Press the Customize button next to "Dates".
Set the "Show" pop-up at the top of the sheet that appears to "Short".

(You can use a similar process to see what your Time formatter settings are.)