Hi again guys,
I'm still having trouble trying to reproduce this.
I see how it can appear that the date is ignored, but in my test the document comes out like so "guides.pdf2_14_2018.pdf
It has the document name, and the date. Sure the document name should not contain.pdf midway through, this is being printed directly from a brand new document in MS word using the exact same settings as you've initially posted willy, with one exception, instead of using "%[DocName]_%[Date]" I am using "%[DocName]%[Date]"
Edit: testing even with the Underscore, it still outputs correctly, please try using the attached settings and see if it works for you.