diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/src/time/scale.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/time/scale.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,123 @@
+// TODO nice
+function d3_time_scale(linear, methods, format) {
+
+  function scale(x) {
+    return linear(x);
+  }
+
+  scale.invert = function(x) {
+    return d3_time_scaleDate(linear.invert(x));
+  };
+
+  scale.domain = function(x) {
+    if (!arguments.length) return linear.domain().map(d3_time_scaleDate);
+    linear.domain(x);
+    return scale;
+  };
+
+  scale.ticks = function(m, k) {
+    var extent = d3_time_scaleExtent(scale.domain());
+    if (typeof m !== "function") {
+      var span = extent[1] - extent[0],
+          target = span / m,
+          i = d3.bisect(d3_time_scaleSteps, target, 1, d3_time_scaleSteps.length - 1);
+      if (Math.log(target / d3_time_scaleSteps[i - 1]) < Math.log(d3_time_scaleSteps[i] / target)) --i;
+      m = methods[i];
+      k = m[1];
+      m = m[0];
+    }
+    return m(extent[0], extent[1], k);
+  };
+
+  scale.tickFormat = function() {
+    return format;
+  };
+
+  scale.copy = function() {
+    return d3_time_scale(linear.copy(), methods, format);
+  };
+
+  // TOOD expose d3_scale_linear_rebind?
+  scale.range = d3.rebind(scale, linear.range);
+  scale.rangeRound = d3.rebind(scale, linear.rangeRound);
+  scale.interpolate = d3.rebind(scale, linear.interpolate);
+  scale.clamp = d3.rebind(scale, linear.clamp);
+
+  return scale;
+}
+
+// TODO expose d3_scaleExtent?
+function d3_time_scaleExtent(domain) {
+  var start = domain[0], stop = domain[domain.length - 1];
+  return start < stop ? [start, stop] : [stop, start];
+}
+
+function d3_time_scaleDate(t) {
+  return new Date(t);
+}
+
+function d3_time_scaleFormat(formats) {
+  return function(date) {
+    var i = formats.length - 1, f = formats[i];
+    while (!f[1](date)) f = formats[--i];
+    return f[0](date);
+  };
+}
+
+var d3_time_scaleSteps = [
+  1e3,    // 1-second
+  5e3,    // 5-second
+  15e3,   // 15-second
+  3e4,    // 30-second
+  6e4,    // 1-minute
+  3e5,    // 5-minute
+  9e5,    // 15-minute
+  18e5,   // 30-minute
+  36e5,   // 1-hour
+  108e5,  // 3-hour
+  216e5,  // 6-hour
+  432e5,  // 12-hour
+  864e5,  // 1-day
+  1728e5, // 2-day
+  6048e5, // 1-week
+  1728e6, // 1-month
+  7776e6, // 3-month
+  31536e6 // 1-year
+];
+
+var d3_time_scaleLocalMethods = [
+  [d3.time.seconds, 1],
+  [d3.time.seconds, 5],
+  [d3.time.seconds, 15],
+  [d3.time.seconds, 30],
+  [d3.time.minutes, 1],
+  [d3.time.minutes, 5],
+  [d3.time.minutes, 15],
+  [d3.time.minutes, 30],
+  [d3.time.hours, 1],
+  [d3.time.hours, 3],
+  [d3.time.hours, 6],
+  [d3.time.hours, 12],
+  [d3.time.days, 1],
+  [d3.time.days, 2],
+  [d3.time.weeks, 1],
+  [d3.time.months, 1],
+  [d3.time.months, 3],
+  [d3.time.years, 1]
+];
+
+var d3_time_scaleLocalFormats = [
+  [d3.time.format("%Y"), function(d) { return true; }],
+  [d3.time.format("%B"), function(d) { return d.getMonth(); }],
+  [d3.time.format("%b %d"), function(d) { return d.getDate() != 1; }],
+  [d3.time.format("%a %d"), function(d) { return d.getDay() && d.getDate() != 1; }],
+  [d3.time.format("%I %p"), function(d) { return d.getHours(); }],
+  [d3.time.format("%I:%M"), function(d) { return d.getMinutes(); }],
+  [d3.time.format(":%S"), function(d) { return d.getSeconds() || d.getMilliseconds(); }]
+];
+
+var d3_time_scaleLocalFormat = d3_time_scaleFormat(d3_time_scaleLocalFormats);
+
+d3.time.scale = function() {
+  return d3_time_scale(d3.scale.linear(), d3_time_scaleLocalMethods, d3_time_scaleLocalFormat);
+};