I'm surprised I haven't found mention of this yet... Blogger's RSS 2.0 feeds seem to at least occasionally be providing incorrect lastBuildDate information.

I'm working on a project at http://sigfeeder.com which reads lastBuildDate to know when an RSS feed has updated. I've got two testers who are using Blogger/Blogspot, and they've both had this problem. The two blogs are http://munster-iv.blogspot.com/ and http://yt-avatars.blogspot.com/ .

As of when I post this, the first provides a lastBuildDate of Mon, 31 Jul 2006 17:56:23 +0000, whereas the pubDate of the most recent item is Tue, 17 Oct 2006 19:42:00 +0000. For the second, the lastBuildDate is set to Fri, 13 Oct 2006 20:19:10 +0000, whereas the pubDate on the most recent item is Thu, 19 Oct 2006 02:04:00 +0000.

Yes, I *could* write a workaround that checks the pubDate of the first item instead of checking lastBuildDate, but frankly I'd rather not, as this appears to be Blogger's bug to fix. According to http://w3schools.com/rss/rss_tag_lastbuilddate.asp , lastBuildDate should be set to when the feed was last modified. Adding an item most certainly should count as a modification!