Index: wp-includes/feed-atom-comments.php
===================================================================
--- wp-includes/feed-atom-comments.php	(revision 5480)
+++ wp-includes/feed-atom-comments.php	(working copy)
@@ -20,7 +20,7 @@
 	<updated><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_lastcommentmodified('GMT')); ?></updated>
 	<generator uri="http://wordpress.org/" version="<?php bloginfo('version'); ?>">WordPress</generator>
 
-	<link rel="alternate" type="<?php bloginfo_rss('html_type'); ?>" content="<?php bloginfo_rss('home'); ?>" />
+	<link rel="alternate" type="<?php bloginfo_rss('html_type'); ?>" href="<?php bloginfo_rss('home'); ?>" />
 	<link rel="self" type="application/atom+xml" href="<?php bloginfo_rss('comments_atom_url'); ?>" />
 	<id><?php bloginfo_rss('comments_atom_url'); ?></id>
 
@@ -49,8 +49,8 @@
 		</author>
 
 		<id><?php comment_link(); ?></id>
-		<updated><?php echo mysql2date('D, d M Y H:i:s +0000', get_comment_time('Y-m-d H:i:s', true), false); ?></updated>
-		<published><?php echo mysql2date('D, d M Y H:i:s +0000', get_comment_time('Y-m-d H:i:s', true), false); ?></published>
+		<updated><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_comment_time('Y-m-d H:i:s', true), false); ?></updated>
+		<published><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_comment_time('Y-m-d H:i:s', true), false); ?></published>
 <?php if (!empty($comment_post->post_password) && $_COOKIE['wp-postpass'] != $comment_post->post_password) : ?>
 		<content type="html" xml:base="<?php comment_link(); ?>"><![CDATA[<?php echo get_the_password_form(); ?>]]></content>
 <?php else : // post pass ?>