--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/time/year.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,7 @@
+d3.time.year = function(date) {
+  return new Date(date.getFullYear(), 0, 1);
+};
+
+d3.time.year.utc = function(date) {
+  return new Date(Date.UTC(date.getUTCFullYear(), 0, 1));
+};