How to get new or updated files?

[ili_ili_ili]

I'm trying to use Library_QueryFilesEx(string query, ref string[] files) to get new or updated files. I don't know what query to use. I've tried "DateModified>2019-09-01" or "DateAdded>20190901" but I get files = null. Help please.

[Steven]

construct an auto-playlist with the criteria you want and then copy the xml in the .autopf file to use as the query parameter