Nevermind, I was mistaken, it works.

My code is pretty much the same:

IRenderLabel:

context)

{

.Empty;

];

.FromOADate(dataValue);

label = dt.ToString("HH:mm");

label;

Here's the graph code:

DateTime

xValueDateTime;

DateTime.TryParse(xygValueCombo.XValue.ToString(), out xValueDateTime);

double xAOValue = xValueDateTime.ToOADate();

series.Points.Add(

new XYDataPoint(xAOValue, yDoubleValue, xValueDateTime.ToString("HH:mm"), false));

and finally...

graph.Axis.X.Labels.ItemFormatString =

"<MY_VALUE>";

Hashtable myLabelHashTable = new Hashtable();

myLabelHashTable.Add(

"MY_VALUE", new DateTimeLabelRender());

graph.LabelHash = myLabelHashTable;

I tried:

     this.ultraChart1.ChartType = ChartType.ScatterChart;

            XYSeries series = new XYSeries();

            for (int i = 0; i < 10; i++)

            {

                series.Points.Add(new XYDataPoint(DateTime.Now.AddMinutes(i).ToOADate(), i, i.ToString(), false));

            }

            this.ultraChart1.Series.Add(series);

            this.ultraChart1.Axis.X.Labels.ItemFormatString = "<MY_VALUE>";

            Hashtable MyLabelHashTable = new Hashtable();

            MyLabelHashTable.Add("MY_VALUE", new MyLabelRenderer());

            this.ultraChart1.LabelHash = MyLabelHashTable;

…

public class MyLabelRenderer : IRenderLabel

    {

        public string ToString(Hashtable context)

        {

            double dataValue = (double)context["DATA_VALUE"];

            DateTime datetime = DateTime.FromOADate(dataValue);

            return datetime.ToString();

        }

    }

And it seems ok. Can you send us your code, so we can investigate it?

This works for me but when the double value of the axis gets passed to my class that implements IRenderLabel, the value is truncated resulting in a different time when I call

DateTime.FromOADate(axisValue)

Why is the axisValue being passed to the IRenderLabel interface being truncated?