how to format datetime in gridview for minutes OR Date

FORMAT MINUTES
<asp:BoundField DataField="HoraAT" HeaderText="Hora" ReadOnly="True" SortExpression="HoraAT" DataFormatString="{0:hh}:{0:mm}" />


FORMAT DATE

<asp:BoundField DataField="CriatedOn" HeaderText="CriatedOn"  DataFormatString="{0:yyyy-MM-dd}"      SortExpression="CriatedOn" Visible="false"/>