[punchilla]

Hello,
it was simple :)
just this code works :

    for( var i = 0; i < charts.length; i++){
      charts[i].options.axisX = {
        labelAngle: 0,
        crosshair: {
          enabled: true,
          snapToDataPoint: true,
          valueFormatString: "HH:mm"
        }
      }
    }

    syncCharts(charts, true, true, true); // syncCharts(charts, syncToolTip, syncCrosshair, syncAxisXRange)

    for( var i = 0; i < charts.length; i++){
      charts[i].render();
    }