Update FoxPro 2.6 date field

<asp:DetailsView ID="DetailsView1" runat="server" BackColor="White" 
        BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px" CellPadding="4" 
        DataSourceID="Oakstreet" ForeColor="Black" GridLines="Vertical" Height="50px" 
        Width="600px" AutoGenerateEditButton="True" AutoGenerateRows="False">
        <FooterStyle BackColor="#CCCC99" />
        <RowStyle BackColor="#F7F7DE" />
        <PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
        <Fields>
            <asp:BoundField DataField="cust_id" HeaderText="Bill ID #" ReadOnly="True" />
            <asp:BoundField DataField="name" HeaderText="Name" ReadOnly="True"  />
            <asp:BoundField DataField="city" HeaderText="City" ReadOnly="True" />
            <asp:BoundField DataField="state" HeaderText="State" ReadOnly="True" />
            <asp:TemplateField HeaderText="Next Call Date">
                <ItemTemplate>
                    <asp:TextBox ID="next_call" Text='<%# Bind("next_call","{0:yyyy/MM/dd}") %>' Runat="server" ReadOnly="true" Wrap="true" Height="30px" Width="150px" />
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="next_call" Text='<%# Bind("next_call","{0:yyyy/MM/dd}") %>' Runat="server" ReadOnly="false" Wrap="true" Height="30px" Width="150px" />
 
                </EditItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="notes">
                <ItemTemplate>
                    <asp:TextBox ID="notes" Text='<%# Bind("notes") %>' Runat="server" ReadOnly="true" Wrap="true" TextMode="MultiLine" Height="300px" Width="600px" />
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="notes" Text='<%# Bind("notes") %>' Runat="server" ReadOnly="false" Wrap="true" TextMode="MultiLine" Height="300px" Width="600px" />
 
                </EditItemTemplate>
            </asp:TemplateField>
        </Fields>
        <HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
        <EditRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" Wrap="true" Width="600px" Height="100%" />
        <AlternatingRowStyle BackColor="White" />
       
    </asp:DetailsView>
    <asp:SqlDataSource ID="Oakstreet" runat="server" 
        ConnectionString="<%$ ConnectionStrings:OakODBC %>" 
        ProviderName="<%$ ConnectionStrings:OakODBC.ProviderName %>" 
        
        SelectCommand="SELECT cust_id,name,city,state,next_call, notes FROM customrs WHERE cust_id=?" 
        UpdateCommand="update customrs set next_call={^?}, notes=? where cust_id=?">
        <UpdateParameters>
           <asp:Parameter Name="next_call" />
           <asp:Parameter Name="notes" />
           <asp:QueryStringParameter Name="cust_id" QueryStringField="id" DefaultValue="26555" />
        </UpdateParameters>

                                  

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