var options = {
          series: [{
          name: "sales",
          data: [{
            x: '2019/01/01',
            y: 400
          }, {
            x: '2019/04/01',
            y: 430
          }, {
            x: '2019/07/01',
            y: 448
          }, {
            x: '2019/10/01',
            y: 470
          }, {
            x: '2020/01/01',
            y: 540
          }, {
            x: '2020/04/01',
            y: 580
          }, {
            x: '2020/07/01',
            y: 690
          }, {
            x: '2020/10/01',
            y: 690
          }]
        }],
          chart: {
          type: 'bar',
          height: 380
        },
        xaxis: {
          type: 'category',
          labels: {
            formatter: function(val) {
              return "Q" + dayjs(val).quarter()
            }
          },
          group: {
            style: {
              fontSize: '10px',
              fontWeight: 700
            },
            groups: [
              { title: '2019', cols: 4 },
              { title: '2020', cols: 4 }
            ]
          }
        },
        title: {
            text: 'Grouped Labels on the X-axis',
        },
        tooltip: {
          x: {
            formatter: function(val) {
              return "Q" + dayjs(val).quarter() + " " + dayjs(val).format("YYYY")
            }  
          }
        },
        };

        var chart = new ApexCharts(document.querySelector("#chart"), options);
        chart.render();