John,
The current script just reports what is in the <lastBuildDate></lastBuildDate> in the RSS feed. Like <lastBuildDate>Sat, 08 Dec 2007 19:28:22 </lastBuildDate>
in your current warnings for CAZ061
Since it's a standard GMT formatted date (with the GMT implied), I can add it to the rss-advisory-test-c.php script if you like. You'll need to set a $timeZone parameter to make it work.
Give me a bit and I'll post an updated script.
Best regards,
Ken