My atom feed validates  and shows in various browsers fine (the
published date). I'm using the atom_feed_helper  very minimally
modified and am on Rails 2.1. I am also using Feedbuner as the xml
+rss alternate link in the meta section.
Whenever I subscribe to the feed in google reader, it also shows the
posts as the date I uploaded my application to the production server.
So in other words, if I uploaded today, google reader will show today
for all the posts.
I examined the output XML to something Mephisto would put out, and it
looks very similar. I tried tweaking the date format using strftime.
I've thrown away the atom_builder code and did some older RSS code
from dzone snippets and elsewhere, also making sure they validate.
Yet despite all that, I still can't get the dates to show up in google
reader correctly! Agghh. Any ideas?
* access feed directly: http://webandy.com/feed