diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/src/time/years.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/time/years.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,11 @@
+d3.time.years = d3_time_range(d3.time.year, function(date) {
+  date.setFullYear(date.getFullYear() + 1);
+}, function(date) {
+  return date.getFullYear();
+});
+
+d3.time.years.utc = d3_time_range(d3.time.year.utc, function(date) {
+  date.setUTCFullYear(date.getUTCFullYear() + 1);
+}, function(date) {
+  return date.getUTCFullYear();
+});