title: Highchart area with date pointStart
body: <p>i'm trying to build a area chart with single data series and date pointStart</p>
  
  <p><a href="https://i.stack.imgur.com/i2obO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/i2obO.png" alt="enter image description here"></a></p>
  
  <p>now i'm trying to change plotOption.area.pointStart as <code>new Date(epoch*1000)</code> format, my current code is : </p>
  
  <pre><code>Highcharts.chart('container', {
      chart: {
          type: 'area'
      },
      title: {
          text: ''
      },
      xAxis: {
          type: 'datetime',
          tickInterval: 24 * 3600 * 1000
      },
      yAxis: {
          title: {
              text: ''
          },
          labels: {
              formatter: function () {
                  return this.value / 1000 + 'k';
              }
          }
      },
      tooltip: {
          pointFormat: '{series.name} had stockpiled &lt;b&gt;{point.y:,.0f}&lt;/b&gt;&lt;br/&gt;warheads in {point.x}'
      },
      plotOptions: {
          area: {
              pointStart: new Date(1562716800*1000),
              pointInterval: 24 * 3600 * 1000,
              marker: {
                  enabled: false,
                  symbol: 'circle',
                  radius: 2,
                  states: {
                      hover: {
                          enabled: true
                      }
                  }
              }
          }
      },
      series: [{
          name: 'Incoming Chat',
          showInLegend: false,
          data: [245, 212, 0]
      }]
  });
  </code></pre>
  
  <p>i don't know but the chart only show single date like : </p>
  
  <p><a href="https://i.stack.imgur.com/uvnog.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uvnog.png" alt="enter image description here"></a></p>