As DateTimeText is a string property it seems like when DateTime is converted to the string the time is also converted. So what you can try is using StringFormat when you convert the DateTime to string and hide the time.
Also you can manipulete the CultureInfo for example:
CultureInfo info = new System.Globalization.CultureInfo("en-US");
info.DateTimeFormat.LongDatePattern = "M/d/yy";
dateTimePicker.Culture = info;
Nevertheless if you don't need specifically to use the DateTimeText you can use SelectedValue.
If you have any troubles with implementing one of the above suggestions it would be best if you can send us more info about your scenario so we would be able to provide you with more detailed help.
the Telerik team