Search between two dates in datagrid

I have a datagrid that contains entities with a date attribute. I would like to search for all objects in this entity whose date attribute is between 2 dates (say january 1 2012 and january 31 2012). When I put two search fields in the search bar for the same attribute, one greater or equal and one smaller or equal, I don't get any results returned for any entry in either or both of these search fields. Even an entry into one of these fields, i.e. greater or equal january 1 2012, returns zero results. What am I missing? I am sure there are others in the Mendix community who want to offer the ability to search for objects within a data range. Thanks!
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