[Solved]-Highcharts: How can I achiveve multiple rows on chart labels?-Highcharts

You can simply add another xAxis, linked it to the first one and set appropriate tick interval. Check demo I posted you below.

Code:

Highcharts.stockChart('container', {
  xAxis: [{
    type: 'datetime',
    tickInterval: 3 * 3600 * 1000, // 3 hours
    labels: {
      formatter: function() {
        return Highcharts.dateFormat('%H:%M', this.value);
      }
    }
  }, {
    offset: 40,
    type: 'datetime',
    linkedTo: 0,
    tickInterval: 24 * 3600 * 1000 // one day
  }],
  series: [{
    data: data
  }]
});

Demo:
https://jsfiddle.net/ngp5o98u/

Api reference:
https://api.highcharts.com/highcharts/xAxis.linkedTo