We are in the process of upgrading our controls to Telerik. We had noticed a behavior that we did not want to happen, this was related to DatePicker control changing the value of the date if incorrect format was entered, we solved this by having EnableSmartParsing to false in our Telerik Theme so that it applies to all DatePicker controls.
Now we have some instances of date controls that are defined with specific DateFormat/DisplayDateFormat like below:
<telerik:RadDatePicker ID="dpId" DateInput-DisplayDateFormat="y" DateInput-DateFormat="y" runat="server"></telerik:RadDatePicker> or
<telerik:RadDatePicker ID="dpFrom" DateInput-DateFormat="MM/yyyy" DateInput-DisplayDateFormat="MMM, yyyy" runat="server"></telerik:RadDatePicker>
<telerik:RadDatePicker runat="server"
DatePopupButton-Visible="false"
PopupDirection="BottomLeft"
ShowPopupOnFocus="true"
DateInput-EnabledStyle-HorizontalAlign="Left"
DateInput-EnableSmartParsing="false"
MinDate="0001-01-01">
</telerik:RadDatePicker>