Index: modules/comment/comment.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/comment/comment.module,v
retrieving revision 1.634
diff -u -p -r1.634 comment.module
--- modules/comment/comment.module	3 Jun 2008 16:30:20 -0000	1.634
+++ modules/comment/comment.module	7 Jun 2008 13:48:57 -0000
@@ -739,7 +739,10 @@ function comment_save($edit) {
           }
         }
 
-        $edit['timestamp'] = time();
+        if (empty($edit['timestamp'])) {
+          $edit['timestamp'] = time();
+        }
+
         if ($edit['uid'] === $user->uid) { // '===' Need to modify anonymous users as well.
           $edit['name'] = $user->name;
         }