The SelectedDateFormat property (Long or Short) allows you to control how the Date value of the column is displayed to the end user.
CType(MyDataGrid.Columns.DataColumns("AdmittanceDate"), DateColumn).SelectedDateFormat = DatePickerFormat.Long
((DateColumn)(MyDataGrid.Columns.DataColumns["AdmittanceDate"])).SelectedDateFormat = DatePickerFormat.Long;
<ig:DateColumn Key="AdmittanceDate" SelectedDateFormat="Long"/>
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2