My RSS template based the sample RSS template out puts the same date for every item in the feed (even though they were posted on different dates).
feed://craftemergency.org/site/rss/
{preload_replace:master_channel_name="news_blog"}
{exp:rss:feed channel="{master_channel_name}"}
<?xml version="1.0" encoding="{encoding}"?>
<rss version="2.0"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
xmlns:admin="http://webns.net/mvcb/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:content="http://purl.org/rss/1.0/modules/content/">
<channel>
<title>CERF+ News</title>
<link>{channel_url}</link>
<description>{channel_description}</description>
<image>
<url>{site_url}images/clogo.png</url>
<title>CERF+</title>
<link>{site_url}</link>
</image>
<dc:language>{channel_language}</dc:language>
<dc:creator>{email}</dc:creator>
<dc:rights>Copyright {gmt_date format="%Y"}</dc:rights>
<dc:date>{gmt_date format="%Y-%m-%dT%H:%i%Q"}</dc:date>
<admin:generatorAgent rdf:resource="http://expressionengine.com/" >
{exp:channel:entries channel="{master_channel_name}" limit="10" dynamic_start="on" disable="member_data|pagination" status="Home Page|Open|Current Focus Home"}
<item>
<title><![CDATA[{title}]]></title>
<link>{title_permalink='news/view'}</link>
<guid>{title_permalink='news/view'}#When:{gmt_entry_date format="%H:%i:%sZ"}</guid>
<description><![CDATA[{blog_content}]]></description>
<dc:subject><![CDATA[{categories backspace="1"}{category_name}, {/categories}]]></dc:subject>
<dc:date>{gmt_entry_date format="%Y-%m-%dT%H:%i%Q"}</dc:date>
</item>
{/exp:channel:entries}
</channel>
</rss>
{/exp:rss:feed}