The OLEAutomation DateTime equivalent (which is used in RadChart, retrieved by the DateTime.ToOADate
method) represents one day as the number one. So this line:
Chart5.PlotArea.XAxis.AddRange(startTime, endTime, 3600/30);
sets a step which is 120 days. I am not sure if this is the expected setting. In addition, I can see that on initial load, when Session["rtstime"] is not set, the start and end values will be very close or identical -- both are set to DateTime.Now.ToOADate().
Please, check these and let us know if the issue remains.
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