Thank you for contacting us.
This issue is only visual, SelectedValue still contains the input datetime value. 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 in one of our future releases. You can track this progress in our Public Issue Tracking System (PITS) with Issue ID = 2863.
Please do not hesitate to contact us if you require any further information.
All the best,
the Telerik team
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