ElementStacks

HTML

<script src="http://highcharts.com/js/testing.js"></script>
<div id="container" style="height: 400px"></div>

JavaScript

var chart = new Highcharts.Chart({
    chart: {
        renderTo: 'container'
    },
    tooltip: {
        formatter: function(){
            return '<b>' + Highcharts.dateFormat('%m/%d/%Y %l:%M:%S %p', this.x) + '</b><br/>' +
                    this.series.name + ': ' + Highcharts.numberFormat(this.y, 2) ;
        }
    },
    xAxis: {
        type: 'datetime'
    },
    series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
        pointStart: Date.UTC(2011,0,1),
        pointInterval: 24 * 3600 * 1000
    }]
});