Ticket #20262: 20262.4.diff

src/wp-includes/comment.php

@@ -3104 +3104 @@
         if ( ! in_array( $post->post_type, $post_types ) )
                 return $open;
 
+        // Undated drafts should not show up as comments closed.
+        if ( $post->post_date_gmt === '0000-00-00 00:00:00' ) {
+                return $open;
+        }
+
         if ( time() - strtotime( $post->post_date_gmt ) > ( $days_old * DAY_IN_SECONDS ) )
                 return false;