Changing publish date of feed

I am trying to figure out how to process a rss feed and have the publsh dates of the items change to "now".  I know that I can use magpierss to do this, but I wanted to see if I can do this in Yahoo Pipes. 

I created this pipe, which should do what I want, and it looks like it is working in the debugger.  But, when you look at the resulting rss output, the publish date of the items aren't changed.