This is the way RadDateTimePicker work at the moment, the properties you have used restrict just the dates selected from the calendar. We decided to leave more space for customization and that is why we have not restricted the date parsing in such specific scenarios. However you can easily manipulate it with some code using the ParseDateTimeValue
event. With it you can set the range for the parsing. You can take a look at this help article
for more info. You can also create a custom message, for example "Date not in allowed range".
Let me know if you have further questions.
All the best,
the Telerik team
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