<asp:BoundField DataField="CreationDate" HeaderText="CreationDate" SortExpression="CreationDate"/>
<asp:boundfield datafield="Your_Date_Column" dataformatstring="{0:d}" htmlencode="false" />
<asp:boundfield datafield="CreationDate" headertext="CreationDate" sortexpression="CreationDate" dataformatstring="{0:dd/MM/yyyy}" />
var
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