stock Stock date in the legend

HTML

<script src="http://www.amcharts.com/lib/amstock.js" type="text/javascript"></script>
<div id="date" style="float:right; margin-bottom: -30px;">-</div>
<div id="chartdiv" style="width: 100%; height: 355px;"></div>

CSS

body
{
    font-size:12px;
    color:#000000;
    background-color:#ffffff;
    font-family:verdana,helvetica,arial,sans-serif;
}

.amChartsButtonSelected
{
   background-color:#CC0000;
   border-style:solid;
   border-color:#CC0000;
   border-width:1px;
   color:#FFFFFF;
  -moz-border-radius: 5px;
  border-radius: 5px;
  margin: 1px;   
}

.amChartsButton
{
   background-color:#EEEEEE;
   border-style:solid;
   border-color:#CCCCCC;
   border-width:1px;
   color:#000000;
  -moz-border-radius: 5px;
  border-radius: 5px;
  margin: 1px;  
}

.amChartsCompareList
{
   border-style:solid;
   border-color:#CCCCCC;
   border-width:1px;
}

JavaScript

var chartData1 = [];
var chartData2 = [];
var chartData3 = [];
var chartData4 = [];

function generateChartData() {
    var firstDate = new Date();
    firstDate.setDate(firstDate.getDate() - 500);
    firstDate.setHours(0, 0, 0, 0);

    for (var i = 0; i < 500; i++) {
        var newDate = new Date(firstDate);
        newDate.setDate(newDate.getDate() + i);

        var a1 = Math.round(Math.random() * (40 + i)) + 100 + i;
        var b1 = Math.round(Math.random() * (1000 + i)) + 500 + i * 2;

        var a2 = Math.round(Math.random() * (100 + i)) + 200 + i;
        var b2 = Math.round(Math.random() * (1000 + i)) + 600 + i * 2;

        var a3 = Math.round(Math.random() * (100 + i)) + 200;
        var b3 = Math.round(Math.random() * (1000 + i)) + 600 + i * 2;

        var a4 = Math.round(Math.random() * (100 + i)) + 200 + i;
        var b4 = Math.round(Math.random() * (100 + i)) + 600 + i;

        chartData1.push({
            date: newDate,
            value: a1,
            volume: b1
        });
        chartData2.push({
            date: newDate,
            value: a2,
            volume: b2
        });
        chartData3.push({
            date: newDate,
            value: a3,
            volume: b3
        });
        chartData4.push({
            date: newDate,
            value: a4,
            volume: b4
        });
    }
}

AmCharts.ready(function() {
    generateChartData();
    createStockChart();
});

function createStockChart() {
    var chart = new AmCharts.AmStockChart();
    chart.pathToImages = "http://www.amcharts.com/lib/images/";

    // DATASETS //////////////////////////////////////////
    // create data sets first
    var dataSet1 = new AmCharts.DataSet();
    dataSet1.title = "first data set";
    dataSet1.fieldMappings = [{
        fromField: "value",
        toField: "value"},
    {
        fromField: "volume",
        toField: "volume"}];
    dataSet1.dataProvider = chartData1;
    dataSet1.categoryField = "date";

    var dataSet2...