highchart----zoomselect

   chart: {
        renderTo: 'container',
        zoomType: 'y',
        events: {
        selection: function(event) {
                if (event.xAxis) {
                    $report.html('Last selection:<br/>min: '+ Highcharts.dateFormat('%Y-%m-%d', event.xAxis[0].min) +
                    ', max: '+ Highcharts.dateFormat('%Y-%m-%d', event.xAxis[0].max));
                } else {
                    $report.html ('Selection reset');
                }
        }
        }
    },