RSS <lastBuildDate> tag
Usage
Specifies the most recent time the content of an RSS feed was modified.
Example
RSS feed with lastBuildDate:
<?xml version="1.0" encoding="ISO-8859-1" ?>
<rss version="2.0">
<channel>
<title>Landofcode.com web tutorials updates</title>
<link>http://www.landofcode.com</link>
<description>Web development tutorials</description>
<lastBuildDate>Fri, 2 Feb 2009 10:32:14 EST</lastBuildDate>
<item>
<title>Site usability</title>
<link>http://www.landofcode.com/usability.html</link>
<description>Learn how to improve the usability of your site</description>
</item>
<item>
<title>New HTML tutorials</title>
<link>http://www.landofcode.com/html-tutorials/</link>
<description>Five new HTML tutorials have been added</description>
</item>
</channel>
</rss>