How to retrieve all Recurrence instances, when "Ends Never" option is chosen?

ej.Schedule.prototype.filterAppointments = function (filterConditions) {
    // here we are storing the default filtering range and current date in other variables
    var oldRenderStart = this._dateRender[0];
    var oldRenderEnd = this._dateRender[this._dateRender.length - 1];
    var oldDate = this.currentDate();
    // here we are assigning the new filtering range and current date
    var newRenderStart = new Date(filterConditions[0].value).getTime();
    this._dateRender[0] = newRenderStart;
    var newRenderEnd = new Date(filterConditions[1].value).getTime();
    this._dateRender[this._dateRender.length - 1] = newRenderEnd;
    this.currentDate(new Date(filterConditions[0].value));
    this._dataProcessing(this._currentAppointmentData);
    var result, queryManagar = ej.Query(), matchcaseVal;
    if (!ej.isNullOrUndefined(filterConditions)) {
        var firstFilterCondition = filterConditions[0];
        matchcaseVal = ej.isNullOrUndefined(firstFilterCondition.matchcase) ? true : firstFilterCondition.matchcase;
        var predicate = ej.Predicate(firstFilterCondition.field, firstFilterCondition.operator, firstFilterCondition.value, matchcaseVal);
        for (var i = 1; i < filterConditions.length; i++) {
            matchcaseVal = ej.isNullOrUndefined(filterConditions[i].matchcase) ? true : filterConditions[i].matchcase;
            predicate = predicate[filterConditions[i].predicate](filterConditions[i].field, filterConditions[i].operator, filterConditions[i].value, matchcaseVal);
        }
        queryManagar.where(predicate);
        if ((this.dataSource() instanceof ej.DataManager)) {
            result = queryManagar;
        }
        else
            result = ej.DataManager(this._processed).executeLocal(queryManagar);
    }
    // here we are again assigning the default filtering range and current date values
    this._dateRender[0] = oldRenderStart;
    this._dateRender[this._dateRender.length - 1] = oldRenderEnd;
    this.currentDate(new Date(oldDate));
    this._dataProcessing(this._currentAppointmentData);
    return result;
}