--- a/templates/fancy.html	Sun Feb 07 22:32:30 2016 +0800
+++ b/templates/fancy.html	Sun Feb 07 22:55:52 2016 +0800
@@ -52,6 +52,7 @@
         size: {height: 500},
         tooltip: {format: {title: function(x) { return x; }}},
         data: JSON.parse(document.getElementById('data').firstChild.nodeValue)
+        axis: {x: {tick: {format: function(x) { return -x; }}}},
       });
     </script>
   </body>

--- a/viewer.py	Sun Feb 07 22:32:30 2016 +0800
+++ b/viewer.py	Sun Feb 07 22:55:52 2016 +0800
@@ -248,7 +248,7 @@
         results, _ = self.getresults(changesets, marks=marks, colors=False)
         json = []
         for cset in changesets:
-            item = {'rev': cset['rev']}
+            item = {'rev': -cset['rev']}
             for mark in marks:
                 values = results.get(cset['node'], {}).get(mark, None)
                 if values is not None: