To show the associated DateTime values ββon XAxis, you can select the XValueType property.
In your case, Series[0].XValueType = ChartValueType.Time will correctly display time-related values.
To format the values, you can use ChartAreas[0].AxisX.LabelStyle.Format , which translates your values ββinto the desired format, for example HH:mm:ss .
ChartAreas[0].AxisX.LabelStyle.Format ="HH:mm:ss";
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