Highcharts - Chart of Time Intervals

Following is an example of a spline chart with symbols.
We have already seen the configuration used to draw a chart in Highcharts Configuration Syntax chapter. Now, let us discuss an example of a spline chart with symbols.
Example

highcharts_spline_time.htm
Live Demo
<html>
   <head>
      <title>Highcharts Tutorial</title>
      <script src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js">
      </script>
      <script src = "https://code.highcharts.com/highcharts.js"></script>  
   </head>
   
   <body>
      <div id = "container" style = "width: 550px; height: 400px; margin: 0 auto"></div>
      <script language = "JavaScript">
         $(document).ready(function() {  
            var chart = {
               type: 'spline'      
            }; 
            var title = {
               text: 'Snow depth at Vikjafjellet, Norway'   
            };
            var subtitle = {
               text: 'Irregular time data in Highcharts JS'
            };
            var xAxis = {
               type: 'datetime',
               dateTimeLabelFormats: { // don't display the dummy year
                  month: '%e. %b',
                  year: '%b'
               },
               title: {
                  text: 'Date'
               }
            };
            var yAxis = {
               title: {
                  text: 'Snow depth (m)'
               },
               min: 0
            };
            var tooltip = {
               headerFormat: '<b>{series.name}</b><br>',
               pointFormat: '{point.x:%e. %b}: {point.y:.2f} m'
            };
            var plotOptions = {
               spline: {
                  marker: {
                     enabled: true
                  }
               }
            };
            var series = [
               {
                  name: 'Winter 2007-2008',
                     // Define the data points. All series have a dummy year
                     // of 1970/71 in order to be compared on the same x axis.
                     // Note that in JavaScript, months start at 0 for January,
                     // 1 for February etc.
                  data: [
                     [Date.UTC(1970,  9, 27), 0   ],
                     [Date.UTC(1970, 10, 10), 0.6 ],
                     [Date.UTC(1970, 10, 18), 0.7 ],
                     [Date.UTC(1970, 11,  2), 0.8 ],
                     [Date.UTC(1970, 11,  9), 0.6 ],
                     [Date.UTC(1970, 11, 16), 0.6 ],
                     [Date.UTC(1970, 11, 28), 0.67],
                     [Date.UTC(1971,  0,  1), 0.81],
                     [Date.UTC(1971,  0,  8), 0.78],
                     [Date.UTC(1971,  0, 12), 0.98],
                     [Date.UTC(1971,  0, 27), 1.84],
                     [Date.UTC(1971,  1, 10), 1.80],
                     [Date.UTC(1971,  1, 18), 1.80],
                     [Date.UTC(1971,  1, 24), 1.92],
                     [Date.UTC(1971,  2,  4), 2.49],
                     [Date.UTC(1971,  2, 11), 2.79],
                     [Date.UTC(1971,  2, 15), 2.73],
                     [Date.UTC(1971,  2, 25), 2.61],
                     [Date.UTC(1971,  3,  2), 2.76],
                     [Date.UTC(1971,  3,  6), 2.82],
                     [Date.UTC(1971,  3, 13), 2.8 ],
                     [Date.UTC(1971,  4,  3), 2.1 ],
                     [Date.UTC(1971,  4, 26), 1.1 ],
                     [Date.UTC(1971,  5,  9), 0.25],
                     [Date.UTC(1971,  5, 12), 0   ]
                  ]
               }, 
               {
                  name: 'Winter 2008-2009',
                  data: [
                     [Date.UTC(1970,  9, 18), 0   ],
                     [Date.UTC(1970,  9, 26), 0.2 ],
                     [Date.UTC(1970, 11,  1), 0.47],
                     [Date.UTC(1970, 11, 11), 0.55],
                     [Date.UTC(1970, 11, 25), 1.38],
                     [Date.UTC(1971,  0,  8), 1.38],
                     [Date.UTC(1971,  0, 15), 1.38],
                     [Date.UTC(1971,  1,  1), 1.38],
                     [Date.UTC(1971,  1,  8), 1.48],
                     [Date.UTC(1971,  1, 21), 1.5 ],
                     [Date.UTC(1971,  2, 12), 1.89],
                     [Date.UTC(1971,  2, 25), 2.0 ],
                     [Date.UTC(1971,  3,  4), 1.94],
                     [Date.UTC(1971,  3,  9), 1.91],
                     [Date.UTC(1971,  3, 13), 1.75],
                     [Date.UTC(1971,  3, 19), 1.6 ],
                     [Date.UTC(1971,  4, 25), 0.6 ],
                     [Date.UTC(1971,  4, 31), 0.35],
                     [Date.UTC(1971,  5,  7), 0   ]
                  ]
               }, 
               {
                  name: 'Winter 2009-2010',
                  data: [
                     [Date.UTC(1970,  9,  9), 0   ],
                     [Date.UTC(1970,  9, 14), 0.15],
                     [Date.UTC(1970, 10, 28), 0.35],
                     [Date.UTC(1970, 11, 12), 0.46],
                     [Date.UTC(1971,  0,  1), 0.59],
                     [Date.UTC(1971,  0, 24), 0.58],
                     [Date.UTC(1971,  1,  1), 0.62],
                     [Date.UTC(1971,  1,  7), 0.65],
                     [Date.UTC(1971,  1, 23), 0.77],
                     [Date.UTC(1971,  2,  8), 0.77],
                     [Date.UTC(1971,  2, 14), 0.79],
                     [Date.UTC(1971,  2, 24), 0.86],
                     [Date.UTC(1971,  3,  4), 0.8 ],
                     [Date.UTC(1971,  3, 18), 0.94],
                     [Date.UTC(1971,  3, 24), 0.9 ],
                     [Date.UTC(1971,  4, 16), 0.39],
                     [Date.UTC(1971,  4, 21), 0   ]
                  ]
               }
            ];
            
            var json = {};
            json.chart = chart;
            json.title = title;
            json.subtitle = subtitle;
            json.tooltip = tooltip;
            json.xAxis = xAxis;
            json.yAxis = yAxis;  
            json.series = series;
            json.plotOptions = plotOptions;
            $('#container').highcharts(json);
         });
      </script>
   </body>
   
</html>
Result

Verify the result.
highcharts_line_charts.htm