The horizontal axis displays the hours from 12:00 to 12:55 instead of specific calendar dates

This script creates a highchart that includes 2 Y axes and 1 X axis:

$('#main_chart').highcharts({
      chart: {
          zoomType: 'xy'
      },
      title: {
          text: 'Overview'
      },
      xAxis: [{
          type: 'datetime'
      }],
      yAxis: [{ // Primary yAxis
          labels: {
              format: '${value}',
              style: {
                  color: Highcharts.getOptions().colors[1]
              }
          },
          title: {
              text: 'Y1',
              style: {
                  color: Highcharts.getOptions().colors[1]
              }
          }
      }, { // Secondary yAxis
          title: {
              text: 'Y2',
              style: {
                  color: Highcharts.getOptions().colors[0]
              }
          },
          labels: {
              style: {
                  color: Highcharts.getOptions().colors[0]
              }
          },
          opposite: true
      }],
      tooltip: {
          shared: true
      },
      legend: {
          layout: 'vertical',
          align: 'left',
          x: 120,
          verticalAlign: 'top',
          y: 100,
          floating: true,
          backgroundColor: (Highcharts.theme && Highcharts.theme.legendBackgroundColor) || '#FFFFFF'
      },
      scrollbar: {
        enabled: true
      },
      series: [{
          name: 'Y1',
          data: y1Data
      }
      ,{
          name: 'Y2',
          data: y2Data
      }
      ]        
  });

y1Data and y2Data refer to arrays containing nested arrays like 

[[1426525200, 2], [1426611600, 0], [1426698000, 0]...]
where the first element represents a date. The dates are consecutive with a daily increment:

1 Mar 2015, 2 Mar 2015, 3 Mar 2015....

However, only the time from 12:00 to 12:55 is shown on the X-axis and nothing else:

I expect to see the dates from 

1 Mar 2015, 2 Mar 2015, 3 Mar 2015.... EndDate
. Additionally, why is there a negative value of $20 displayed? There should not be any negative values in the dataset.

javascriptchartshighcharts

Answer №1

When defining data, it is important to either provide a timestamp in milliseconds (not seconds) or use the JavaScript Date object instead:

var y1Data = [[new Date(), 2], [1426611600000, 0], [Date.UTC(2010, 2, 1), 0]];

In response to your question about $-20, Highcharts utilizes its own algorithm to guess the most suitable axis minimums and maximums. If you are unsatisfied with the result, you can manually set it by using:

yAxis: {
   min: 0,
   ...
}

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