RSS Pubdate usage / mailchimp

I created a mail chimp rss driven newsletter with the rss feed of event made easy.

I want an newsletter triggered each time there is a new event.
but when “RSS Pubdate usage” is “yes” I got this error:

This feed does not validate.
line 16, column 40: pubDate must be an RFC-822 date-time: ven, 13 Jan 2017 16:21:34 +0000 (4 occurrences) [help]
<pubDate>ven, 13 Jan 2017 16:21:34 +0000</pubDate>
^

When i put RSS Pubdate usage “no” the feed validate but the rss driven newsletter is not triggered.

Can you help with this issue?