At the moment, using a date filter for example in patron search results page or catalogue detail page requires user to put the date in format 'yyyy-mm-dd'. However, this isn't quite intuitive if the date is presented in other format (e.g. dd.mm.yyyy) in the user interface. Ideally the filtering should be possible using the format set in syspref 'dateformat'.
I've made this the duplicate, as there is more discussion that has happened on the other bug (even though this bug was created first). *** This bug has been marked as a duplicate of bug 38110 ***