Can I filter out older posts?

Hi,
I’m using the RSS to post feature of your plugin and my problem is that some of the RSS feeds have really old posts in them and they also get published now. I’d like to know if it’s possible to make the plugin only publish posts made today, or maybe those that are a few days old.

Thank you.

http://wordpress.org/extend/plugins/wp-rss-multi-importer/