I'm using Wordpress API just to perform some tests. I'm currently working with the date_query parameter, which, in my case, doesn't work as expected.
Just consider this request : https://wptest.enguerranweiss.com/wp-json/wp/v2/posts?filter[orderBy]=date&filter[order]=DESC&filter[date_query][after]=2016-10-13T17 (dummy install, dummy content)
What I expect : the API should only return the posts more recent than
2016-10-13. Right now, the filter seems to be ignored.