Hi Robyn,
Thank you for writing.
This input mode is not supported by RadDateTimePicker. You should enter 0-2/1-9/9-9, e.g. digits delimiter digits delimiter digits in order to enter the date. The behavior that you expect can be achieved using RadMaskedTextBox with Standard mask and Mask "##/##/####". In this case you cannot have validation of the input.
I hope this helps.
Kind regards,
Peter
the Telerik team
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