diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/src/time/hours.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/time/hours.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,11 @@
+d3.time.hours = d3_time_range(d3.time.hour, d3_time_hoursStep, function(date) {
+  return date.getHours();
+});
+
+d3.time.hours.utc = d3_time_range(d3.time.hour.utc, d3_time_hoursStep, function(date) {
+  return date.getUTCHours();
+});
+
+function d3_time_hoursStep(date) {
+  date.setTime(date.getTime() + 36e5);
+}