Re datetime filters: If the datetimes are ISO formatted strings, would regex matching not work for basic filtering? where json_field.datetime similar to '

Re datetime filters: If the datetimes are ISO formatted strings, would regex matching not work for basic filtering? where json_field.datetime similar to '2016-07-.*' Of course, it'll probably be slow-tastic, and less convenient than native datetime manipulation, but hey, maybe it's enough to get unblocked?