Updating rss feed times without changing content

[mickey11]

my question is like the title reads

If I have an rss feed in an xml file and from time to time I update the pubdate and time. Will this have a positive effect on my website in terms of the rss aggregators coming to my site thinking that it was recently updated and creating links to these pages or will they be able to determine that there is nothing new by comparing it to the old page that they may have stored. thus doing nothing or maybe even hurting the website.

[bobjones]

I'd suspect that if you change the date, and ping rss aggregators, they'll publish the content, which then becomes 99.9% duplicate content.