c# 차트 x좌표 날짜 나오게 하기

 private void button1_Click(object sender, EventArgs e)
        {
            var s = new Series();
            s.ChartType = SeriesChartType.Line;

            var d = new DateTime(2013, 04, 01);

            s.Points.AddXY(d, 3);
            s.Points.AddXY(d.AddMonths(-1), 2);
            s.Points.AddXY(d.AddMonths(-2), 1);
            s.Points.AddXY(d.AddMonths(-3), 4);

            chart1.Series.Clear();
            chart1.Series.Add(s);


            chart1.Series[0].XValueType = ChartValueType.DateTime;
           chart1.ChartAreas[0].AxisX.LabelStyle.Format = "yyyy-MM-dd";
           
            chart1.ChartAreas[0].AxisX.Interval = 1;
            chart1.ChartAreas[0].AxisX.IntervalType = DateTimeIntervalType.Months;
            chart1.ChartAreas[0].AxisX.IntervalOffset = 1;

            chart1.Series[0].XValueType = ChartValueType.DateTime;
     

        /  DateTime minDate = new DateTime(2013, 01, 01).AddSeconds(-1);
            DateTime maxDate = new DateTime(2013, 05, 01); // or DateTime.Now;
            chart1.ChartAreas[0].AxisX.Minimum = minDate.ToOADate();
            chart1.ChartAreas[0].AxisX.Maximum = maxDate.ToOADate();
        }