diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/src/time/weeks.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/time/weeks.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,11 @@
+d3.time.weeks = d3_time_range(d3.time.week, function(date) {
+  date.setDate(date.getDate() + 7);
+}, function(date) {
+  return ~~((date - new Date(date.getFullYear(), 0, 1)) / 6048e5);
+});
+
+d3.time.weeks.utc = d3_time_range(d3.time.week.utc, function(date) {
+  date.setUTCDate(date.getUTCDate() + 7);
+}, function(date) {
+  return ~~((date - Date.UTC(date.getUTCFullYear(), 0, 1)) / 6048e5);
+});