I was able to reproduce the observed issue. I have logged this issue in our Feedback Portal. You can track its progress, subscribe for status changes and add your comment to it here
. I have also updated your Telerik Points
To workaround this you need to set the Min/Max date of the provider:
provider = TryCast(radTimePicker1.TimePickerElement.MaskedEditBox.Provider, FreeFormDateTimeProvider)
I hope this will be useful. Let me know if you have additional questions.