Hello dung dinh,
Thank you for contacting us.
Thank you for reporting this bug, it helps us in improving our products. I am glad to give you points for reporting this abnormal behavior of our RadDateTimePicker control. We will fix this bug in one of our future releases. You can track this progress in our Public Issue Tracking System (PITS) with Issue ID = 2813.
Attached you can find a sample project that shows how to work around this issue. Sorry for any inconvenience caused.
Please do not hesitate to contact us if you require any further information.
All the best,
the Telerik team
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