I've looked at a number of threads on this but none have fixed my problem. The DateFormatString="{0:dd MMM yyyy}" is not being applied. This is a date field in the database and it is currently being displayed as mm/dd/
Here's the column definition:
<telerik:GridDateTimeColumn UniqueName="RECORDSTARTDATE" HeaderText="Record Start Date" DataField="RECORDSTARTDATE" ShowFilterIcon="false" DataFormatString="{0:dd MMM yyyy}" DataType="System.DateTime" HtmlEncode="false" ItemStyle-CssClass="center" CurrentFilterFunction="GreaterThanOrEqualTo" HeaderStyle-Width="120px" />