When the user types 0 in with the month selected , the entire date time values goes blank and shows the format. It is reproducible on your demo
https://demos.telerik.com/blazor-ui/datetimepicker/incremental-steps
to reproduce,
- click inside the date shown on the example on the above page to select the year
- press tab until the month is highlighted
- press 0
- entire date is cleared and the format is shown