Hi Dmitry,
We appreciate you for finding the solution by yourself.
Here are the steps to format the TimeSpan in ToolTip. Please take a look into these steps.
1) Initialize the chart with data as you found.
2) Use the 'GetValueByPoint' method to get date time value from double and then convert the time span inside Chart control's MouseMove event. For example have a look at the following code.
[C#]
ChartPoint chpt = chartControl1.ChartArea.GetValueByPoint(new Point(e.X, e.Y));
string dx = chpt.DateX.ToShortDateString();
DateTime[] d = chpt.GetYValuesAsDateTime();
string dy = d[0].ToString("d,hh:mm:ss");
Please have a look into the
Time span sample attached.
Let me know if this helps.
Thanks for using Syncfusion products.
Regards,
Sureshbabu