Did you configure the RSS import properly? After you've chosen the class to use for RSS import and clicked the "Set" button, you will be presented a bunch of select boxes to map content attributes ("published" and "modified" are 2 of them) to fields in the RSS feed. If you want your RSS objects to have their published dates to equal the published date in the feed, then choose Item - PubDate from the "published" select box. If this does not work as intended, then please report it in our issue tracker at http://issues.ez.no