protected void Page_Load(object sender, System.EventArgs e)
                       {
                           FpSpread1.Sheets[0].Cells[1, 1].Value = DateTime.Now;
                       }

protected void Button1_Click(object sender, EventArgs e)
        {
            //Date Occurs CF
            FarPoint.Web.Spread.TimePeriodConditionalFormattingRule time = new FarPoint.Web.Spread.TimePeriodConditionalFormattingRule(FarPoint.Web.Spread.TimePeriod.Last7Days);
            time.TimePeriod = FarPoint.Web.Spread.TimePeriod.Last7Days;
            time.ForeColor = Color.Magenta;
            FpSpread1.ActiveSheetView.SetConditionalFormatting(1, 1, time);
        }

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
            FpSpread1.Sheets(0).Cells(1, 1).Value = Date.Now
        End Sub

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
            'Date Occurs CF
            Dim time As New FarPoint.Web.Spread.TimePeriodConditionalFormattingRule(FarPoint.Web.Spread.TimePeriod.Last7Days)
            time.TimePeriod = FarPoint.Web.Spread.TimePeriod.Last7Days
            time.ForeColor = Drawing.Color.DarkMagenta
            FpSpread1.ActiveSheetView.SetConditionalFormatting(1, 1, time)
        End Sub