title: D3 Parsing Error
body: <p>This is likely a very easy question (but I'm new to D3 and trying to go through some of the examples to get a better understanding of how it works).  I'm trying to modify one of the base examples for D3 (<a href="http://bl.ocks.org/mbostock/1667367" rel="nofollow">http://bl.ocks.org/mbostock/1667367</a>).  I've basically kept everything the same... I'm just trying to use a different csv file with my own data (vs. the S&amp;P 500 stock data).  In the example file, the csv file has a date (month year) and a stock price.  In my data, I have a UTC time stamp and a light value (between 0-1000).  Here's a small example of the csv:</p>
  
  <pre><code>date, light
  2013-01-01T09:00:00.000Z,554.22
  2013-01-01T09:01:00.000Z,480.83
  2013-01-01T09:02:00.000Z,433.19
  2013-01-01T09:03:00.000Z,596.89
  2013-01-01T09:04:00.000Z,421.78
  2013-01-01T09:05:00.000Z,461.23
  2013-01-01T09:06:00.000Z,560.04
  </code></pre>
  
  <p>When, I run my code I get an error in the console window saying I have a parsing error (not sure if it's getting caught up in parsing the data or the light value)...  Does anyone see a problem with how I'm setting up the csv file (or how I might be parsing it incorrectly)?  Here's the D3 code I'm working with.</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;meta charset="utf-8"&gt;
  &lt;style&gt;
  
  svg {
    font: 10px sans-serif;
  }
  
  path {
    fill: steelblue;
  }
  
  .axis path,
  .axis line {
    fill: none;
    stroke: #000;
    shape-rendering: crispEdges;
  }
  
  .brush .extent {
    stroke: #fff;
    fill-opacity: .125;
    shape-rendering: crispEdges;
  }
  
  &lt;/style&gt;
  &lt;body&gt;
  &lt;script src="http://d3js.org/d3.v3.min.js"&gt;&lt;/script&gt;
  &lt;script&gt;
  
  var margin = {top: 10, right: 10, bottom: 100, left: 40},
      margin2 = {top: 430, right: 10, bottom: 20, left: 40},
      width = 960 - margin.left - margin.right,
      height = 500 - margin.top - margin.bottom,
      height2 = 500 - margin2.top - margin2.bottom;
  
  var parseDate = d3.time.format("%Y-%m-%dT%H:%M:%S.%LZ").parse;
  
  var x = d3.time.scale().range([0, width]),
      x2 = d3.time.scale().range([0, width]),
      y = d3.scale.linear().range([height, 0]),
      y2 = d3.scale.linear().range([height2, 0]);
  
  var xAxis = d3.svg.axis().scale(x).orient("bottom"),
      xAxis2 = d3.svg.axis().scale(x2).orient("bottom"),
      yAxis = d3.svg.axis().scale(y).orient("left");
  
  var brush = d3.svg.brush()
      .x(x2)
      .on("brush", brush);
  
  var area = d3.svg.area()
      .interpolate("monotone")
      .x(function(d) { return x(d.date); })
      .y0(height)
      .y1(function(d) { return y(d.light); });
  
  var area2 = d3.svg.area()
      .interpolate("monotone")
      .x(function(d) { return x2(d.date); })
      .y0(height2)
      .y1(function(d) { return y2(d.light); });
  
  var svg = d3.select("body").append("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom);
  
  svg.append("defs").append("clipPath")
      .attr("id", "clip")
      .append("rect")
      .attr("width", width)
      .attr("height", height);
  
  var focus = svg.append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
  
  var context = svg.append("g")
      .attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");
  
  d3.csv("Light.csv", function(error, data) {
    console.log(data);
  
    data.forEach(function(d) {
      d.date = parseDate(d.date);
      //d.light = +d.light;
      //console.log(d);
    });
  
    x.domain(d3.extent(data.map(function(d) { return d.date; })));
    y.domain([0, d3.max(data.map(function(d) { return d.light; }))]);
    x2.domain(x.domain());
    y2.domain(y.domain());
  
    focus.append("path")
        .datum(data)
        .attr("clip-path", "url(#clip)")
        .attr("d", area);
  
    focus.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);
  
    focus.append("g")
        .attr("class", "y axis")
        .call(yAxis);
  
    context.append("path")
        .datum(data)
        .attr("d", area2);
  
    context.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height2 + ")")
        .call(xAxis2);
  
    context.append("g")
        .attr("class", "x brush")
        .call(brush)
      .selectAll("rect")
        .attr("y", -6)
        .attr("height", height2 + 7);
  });
  
  function brush() {
    x.domain(brush.empty() ? x2.domain() : brush.extent());
    focus.select("path").attr("d", area);
    focus.select(".x.axis").call(xAxis);
  }
  
  &lt;/script&gt;
  </code></pre>