High charts Plot lines not working on IE10 ?

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Hello,

can anyone here help me out of this situation ?

i am trying to plot lines on high charts . it works fine on Google chrome,IE9 but not working for IE10. below is the code for plotting lines.

xAxis: {
    maxZoom: 60 * 60 * 1000, // one hour
    title: {
        text: 'Hours'
    },
    type: 'datetime',
    labels: {
        formatter: function () { return Highcharts.dateFormat('%H', this.value); }
    },
    plotLines: [{
        value: startDate,
        width: 4,
        color: 'red'
    },
    {
        value: endDate,
        width: 4,
        color: 'green'
    }]
},

i am supplying the startDate and endDate in milliseconds as the x-axis is of type:- datetime .

Thanks.