Index: wp-admin/includes/comment.php
===================================================================
--- wp-admin/includes/comment.php	(revision 7596)
+++ wp-admin/includes/comment.php	(working copy)
@@ -21,7 +21,7 @@
 	$_POST['comment_content'] = $_POST['content'];
 	$_POST['comment_ID'] = (int) $_POST['comment_ID'];
 
-	foreach ( array ('aa', 'mm', 'jj', 'hh', 'mm') as $timeunit ) {
+	foreach ( array ('aa', 'mm', 'jj', 'hh', 'mn') as $timeunit ) {
 		if ( !empty( $_POST['hidden_' . $timeunit] ) && $_POST['hidden_' . $timeunit] != $_POST[$timeunit] ) {
 			$_POST['edit_date'] = '1';
 			break;