Crystal Report, showing record of current day only

Question

Geeks, 
     I am using crystal report in my project in which i am having some btns (month,Day,Year) like when i click any btn among them report data should be shown only of that current month or day or year.  i did this somehow for month btn .

private void button4_Click(object sender, EventArgs e)

        {//month

            crystalReportViewer1.ReportSource = null;

            DateTime dtFrom = new DateTime(DateTime.Today.Year, DateTime.Today.Month, 1);

            DateTime dtTo = dtFrom.AddMonths(1).AddDays(-1);

            

            if (ReportName == "SalesReport")

            {

                Report.RecordSelectionFormula = String.Format("{0} >= CDate({1:yyyy,MM,dd}) And {0} <= CDate({2:yyyy,MM,dd})", "{BILLH.B_date}", dtFrom, dtTo);

                crystalReportViewer1.ReportSource = this.Report;

                crystalReportViewer1.Refresh();

            }

            else if (ReportName == "PurchaseReport")

            {

                Report.RecordSelectionFormula = String.Format("{0} >= CDate({1:yyyy,MM,dd}) And {0} <= CDate({2:yyyy,MM,dd})", "{PRO_BILL.P_purdate}", dtFrom, dtTo);

                crystalReportViewer1.ReportSource = this.Report;

                crystalReportViewer1.Refresh();

            }

this code is working fine for month but now i want to do same for DAY btn ,i help me in this . thanks in advance .