[Plugin: RSSImport] Specific publishing date

Great plugin. I am looking for a way to only display items from a specific (published) date. Something like this:

[RSSImport display=”5″ feedurl=”http://bueltge.de/feed/” pubdate=”2011-04-01″]

So in this example only the feed items published on 2011-04-01 will be displayed.

Is this possible?

http://wordpress.org/extend/plugins/rss-import/