Hello Kiran Ghanwat,
The problem stems from the fact that RadChart uses a constant step, that is always the same when graphing the datetime data while months by definition are not uniform at all. Some months are 31 days, others 30, February is 28. When using a uniform step with non-uniform periods you are bound to see some side effects like the one described in your ticket.
With that said, we realize months are an important time period and are currently looking for ways to better implement support for them. We might have a treat for you in the Q2 release :) Stay tuned!
All the best,
the Telerik team
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