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I just checked the Super Store Excel data set. They filter/extract and then offer editing of the filter just fine. But then this isn't Oracle. So you might try submitting this to Support.
I'm having the same issue and can't find a way to change the date range. Did you happen to get a response? I don't really want to remove the extract and recreate. Also using Oracle. Be interested to know your findings.
You probably figured this out by now or rebuilt your extract, but have you tried cycling your data source back to live connection (by unchecking the "use extract" option) then to extract again which will give you the opportunnity to add/modify your extract filters? You can duplicate your data source and try out.