title: HighCharts - timeseries chart - irregular datetime interval on xAxis
body: <p>I need to make a chart on  which xAxis is of type 'datetime', but have irregular intervals:</p>
  
  <p><a href="http://jsfiddle.net/cz6rL/" rel="nofollow">http://jsfiddle.net/cz6rL/</a></p>
  
  <p>this is the code:</p>
  
  <pre><code>$(function () {
    $('#chart1').highcharts({
        chart: {
        zoomType: 'x',
        spacingRight: 20
        },
        title: {
        text: 'Incomes/Outcomes'
        },
        subtitle: {
        text: document.ontouchstart === undefined ?
            'Click and drag in the plot area to zoom in' :
            'Pinch the chart to zoom in'
        },
        xAxis: {
        type: 'datetime',
        minRange: 15 * 24 * 3600000,
  
        title: {
            text: null
        }
        },
        yAxis: {
        title: {
            text: 'Euro(€)'
        }
        },
        tooltip: {
        shared: true
        },
        legend: {
        enabled: true
        },
        plotOptions: {
        area: {
            fillColor: {
            linearGradient: { x1: 0, y1: 0, x2: 0, y2: 1},
            stops: [
                [0, Highcharts.getOptions().colors[9]],
                [1, Highcharts.Color(Highcharts.getOptions().colors[0]).setOpacity(0).get('rgba')]
            ]
            },
            //lineWidth: 1,
            marker: {
            enabled: false
            },
            shadow: false,
            states: {
            hover: {
                lineWidth: 1
            }
            },
            threshold: null
        }
        },
  
        series: [{
        type: 'area',
  
        pointInterval: 24 * 3600 * 1000,
        pointStart: Date.UTC(2014, 0, 01),
        data: [["31/12/2013", 345.2], ["09/01/2014", 494.79999999999995], ["20/01/2014", 137.2], ["22/01/2014", 210.0], 
        ["23/01/2014", 220.4], ["24/01/2014", 871.0], ["28/01/2014", 420.0], ["30/01/2014", 420.0], ["31/01/2014", 2057.15], 
        ["05/02/2014", 191.2], ["06/02/2014", 81.6], ["07/02/2014", 295.2], ["11/02/2014", 135.12], ["12/02/2014", 189.2], 
        ["13/02/2014", 210.0], ["14/02/2014", 315.2], ["17/02/2014", 462.79999999999995], ["18/02/2014", 544.4], 
        ["19/02/2014", 715.4399999999999], ["20/02/2014", 971.2], ["21/02/2014", 418.0], ["02/02/2015", 366.0]]
        }]
    });     
    });
  </code></pre>
  
  <p>you can see that series values do not correspond to xAxis values. How can I fix it: having same days on xAxis or having months corresponding to series values days?</p>
  
  <p>thanks
  Luke</p>