hi,
Datagrid code with check box and date field
<asp

ataGrid id="grdAuthors" runat="server" Width="626px">
<Columns>
<asp:TemplateColumn>
<ItemTemplate>
<asp:CheckBox ID="chkbox" Runat="server"></asp:CheckBox>
</ItemTemplate>
</asp:TemplateColumn>
<asp:BoundColumn DataField="Date" HeaderText="Date"
></asp:BoundColumn>
</Columns>
</asp

ataGrid>
and with dataItemBound event of grid u can write code as below
string _lblDate = e.Item.Cells[1].Text.ToString(); //date column
CheckBox _chkBox = (CheckBox)e.Item.FindControl("chkbox");
if(_chkBox != null)
{
if(_lblDate == "True")//Here u can check if some date text is
//bound with the label
{
_chkBox.Checked = true;
}
}