Date in RSS Feed

Okay, I’ve searched and am just not finding an answer. I need to have the date of a post in my RSS feeds. I cannot see how to add it.

My site, which uses Feedburner, doesn’t show it:
http://feeds.feedburner.com/123InternetMarketing

Nor does my client who isn’t using Feedburner, doesn’t show it either:
http://www.poolspalmbeaches.com/?feed=rss

Where on earth is the place (or what is the code) for adding the date into the RSS Feed?

I appreciate any assistance.
-Elizabeth