Looks like our Oracle APEX IR Filter messes up the date when you do the following:
1. In an Interactive Report create a filter on a date field and apply it.
2. Edit the date field by clicking on the link (highlighted in yellow above)
That seems to not do that on apex.oracle.com but was able to see the garbaged date when switching the column of the filter from the date to a varchar and then back to the date.
Is there a patch for this?