in telerik you can set the date format by using
DateInput-DateFormat="dd/MM/yyyy"
for example :
<telerik:raddatepicker id="txtfromdate" skin="WebBlue" mindate="0001-01-01" xmlns:telerik="#unknown">
runat="server" Width="50%" DateInput-DateFormat="dd/MM/yyyy">
</telerik:raddatepicker>