InfoPath Dev

Hi,
I have big issue with date/time format which are stored in one Share Point 2010 document library's column. Dates are stored as e.g. 15.11.2011., and in some fields dates are stored in wrong format, as 2011-11-15T00:00:00Z. When i try to open Infopath document that uses date in wrong format, the form becomes unusable, and any further changes could not be made.
Does enyone have clue what could be the problem?
Thanks in advance

I'm guessing your form was updated to use the now() function for the date field and re-published to the document library. If that's the case, you may want to change the date field's function to today() instead of now(). Do you have access to fhe form template that was published to this library?

Today() function is in use. There are about 200 items, and just 3 have this problem. This is some how written in that way, and i have tried to correct this - but without success. Do you have any other ideas?