So I noticed that Calibre is actually adding the date format I want at the
end of the filename: Economist [Fri, 17 Apr 2015], The_2015-4-17.epub
I'm guessing that's a built in behavior for any items tagged "News"? It didn't do that when it was using the incorrect lower case "news" tag so I'm not sure what is causing that date to be appended. Is there a separate template for News items somewhere? It seems like there is because my non-News books don't have this date field so something else is causing these chronological dates to appear. Is there a way to access this News specific template and re-arrange that chronological date to the beginning?
Here is the template I tried creating in the plugboard (using #date by itself just to see if could even get it to show by itself):
{#tags:'contains($, "News", field('#date'), field('#title'))'}
http://i.imgur.com/5qdE7ie.png
However it didn't seem to change the filenames at all for the News items. I'm not sure if the template is at fault or if, like I said before, News items are following their own template somewhere else?