How filter Date Column data in Devexpress XPO XPDataView

public string GetCreatedDate(string period, string column, string customFilterFrom = null, string                CustomFilterTo = null)
        {

            string date = string.Empty; string filterexp = string.Empty;
            DateTime dt = DateTime.Today;
            switch (period.ToUpper())
            {

                case "CUSTOM":
                    date = new BetweenOperator(column, Convert.ToDateTime(customFilterFrom.Replace("/", "-                                  ")),       Convert.ToDateTime(CustomFilterTo.Replace("/", "-"))).ToString();

                    break;
                case "TODAY":
                    date = new BetweenOperator(column, dt, dt.AddDays(1)).ToString(); //string.Format("[{1}]                                    = #{0}#", dt, column);//.ToString("MM/dd/yyyy")
                    break;
                case "LASTDAY":
                     date = new BetweenOperator(column,dt.AddDays(-1),dt).ToString();
                    break;
                case "THISYEAR":
                    date = new BetweenOperator(column, new DateTime(DateTime.Now.Year, 4, 1),                                                      dt.AddDays(1)).ToString();
                    break;

                case "THISMONTH":
                    date = new BetweenOperator(column, new DateTime(DateTime.Now.Year,                                                             DateTime.Now.Month, 1), dt.AddDays(1)).ToString();
                    break;
                case "LASTMONTH":
                    date = new BetweenOperator(column, new DateTime(DateTime.Now.Year,                                                            DateTime.Now.Month, 1).AddMonths(-1), new DateTime(DateTime.Today.Year,                                          DateTime.Today.Month, 1).AddDays(-1)).ToString();
             
                    break;
                case "THISWEEK":
                    int days = (DateTime.Now.DayOfWeek - DayOfWeek.Sunday) - 1;
                    DateTime thisweek = DateTime.Now.AddDays(-(days));
                    date = new BetweenOperator(column, thisweek, thisweek.AddDays(days)).ToString();
                    break;
                case "LASTWEEK":
                    int diff = (DateTime.Now.DayOfWeek - DayOfWeek.Sunday) + 6;
                    DateTime mondayOfLastWeek = DateTime.Now.AddDays(-diff);
                    date = new BetweenOperator(column, mondayOfLastWeek,                                                                                 mondayOfLastWeek.AddDays(diff -6)).ToString();
                     break;
                default:
                    date = string.Format("[{0}] = '{1}'", column, period);
                    break;

            }
            return date;
        }

Refer my original post in devexpress : Unable to filter date values in xpo DataSource