Here is a sample code. It allows to edit a row only if inserted time  and the editing time are  between 08:00 hrs and 14:00 hrs on a date.  You may customize this and use asper your actual requirements.

in form

<form id="form1" runat="server">
    <asp:GridView ID="GridView1" runat="server" PageSize="2"
        AutoGenerateColumns="False" DataSourceID="SqlDataSource1"
        onrowdatabound="GridView1_RowDataBound">
        <Columns>
            <asp:BoundField DataField="insertedAT" HeaderText="insertedAT"
                SortExpression="insertedAT" />
            <asp:BoundField DataField="insertedby" HeaderText="insertedby"
                SortExpression="insertedby" />
            <asp:TemplateField HeaderText="Edit">
                <ItemTemplate>
                    <asp:Button ID="EditButton" runat="server" Height="26px" Text="Edit" CommandName ="Edit"/>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
    <br />
    <asp:SqlDataSource ID="SqlDataSource1" runat="server"
        ConnectionString="<%$ ConnectionStrings:TestConnectionString %>"
        SelectCommand="SELECT [insertedAT], [insertedby] FROM [timecheck]"></asp:SqlDataSource>
    <br />
    </form>

C#

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            Button btnEdit = (Button)(e.Row.FindControl("EditButton"));
            DateTime insertedTime = Convert.ToDateTime(e.Row.Cells[0].Text.Trim());
            DateTime editTime = DateTime.Now;
            DateTime thisDay = DateTime.Today;
            
            string  AllowedEditS1 = thisDay.ToString("dd-MM-yyyy") + " 08:00";
            string AllowedEditE1 = thisDay.ToString("dd-MM-yyyy") + " 14:00";
            DateTime allowedEditStart1 = Convert.ToDateTime(AllowedEditS1);
            DateTime allowedEditEnd1 = Convert.ToDateTime(AllowedEditE1);
            bool isTimeBetween = insertedTime >= allowedEditStart1 && insertedTime <= allowedEditEnd1;
            bool editAllowed = editTime >= allowedEditStart1 && editTime <= allowedEditEnd1;
           
            if (isTimeBetween == true && editAllowed == false)
            {

                btnEdit.Enabled = false;
               
            }

        }