diff --git a/charts/wchart/data_series_set_simple_set.go b/charts/wchart/data_series_set_simple_set.go
index 0bb2197..fb30d06 100644
--- a/charts/wchart/data_series_set_simple_set.go
+++ b/charts/wchart/data_series_set_simple_set.go
@@ -30,7 +30,7 @@ func DSSToChart(data statictimeseries.DataSeriesSet, opts ChartOptions) chart.Ch
 		}
 		times := timeutil.TimeSeriesSlice(
 			timeutil.Month,
-			statictimeseries.DataSeriesItemTimes(&series))
+			series.ItemTimes())
 		ts.XValues = times
 		yvalues := []float64{}
 		for _, t := range times {
diff --git a/data/statictimeseries/data_series.go b/data/statictimeseries/data_series.go
index 1d89b33..2a27e39 100644
--- a/data/statictimeseries/data_series.go
+++ b/data/statictimeseries/data_series.go
@@ -211,7 +211,7 @@ func (ds *DataSeries) DeleteByTime(dt time.Time) {
 	delete(ds.ItemMap, dt.Format(time.RFC3339))
 }
 
-func (ds *DataSeries) ToMonth() DataSeries {
+func (ds *DataSeries) ToMonth(inflate bool) DataSeries {
 	newDataSeries := DataSeries{
 		SeriesName: ds.SeriesName,
 		ItemMap:    map[string]DataItem{},
@@ -225,16 +225,29 @@ func (ds *DataSeries) ToMonth() DataSeries {
 			Value:      item.Value,
 			ValueFloat: item.ValueFloat})
 	}
+	if inflate {
+		timeSeries := timeutil.TimeSeriesSlice(
+			timeutil.Month,
+			newDataSeries.ItemTimes())
+		for _, dt := range timeSeries {
+			newDataSeries.AddItem(DataItem{
+				SeriesName: newDataSeries.SeriesName,
+				Time:       dt,
+				IsFloat:    newDataSeries.IsFloat,
+				Value:      0,
+				ValueFloat: 0.0})
+		}
+	}
 	return newDataSeries
 }
 
-func (ds *DataSeries) ToMonthCumulative(timesInput ...time.Time) (DataSeries, error) {
+func (ds *DataSeries) ToMonthCumulative(inflate bool, timesInput ...time.Time) (DataSeries, error) {
 	newDataSeries := DataSeries{
 		SeriesName: ds.SeriesName,
 		ItemMap:    map[string]DataItem{},
 		IsFloat:    ds.IsFloat,
 		Interval:   timeutil.Month}
-	dsMonth := ds.ToMonth()
+	dsMonth := ds.ToMonth(inflate)
 	var min time.Time
 	var max time.Time
 	var err error
@@ -335,9 +348,9 @@ func (ds *DataSeries) WriteXLSX(filename, sheetname, col1, col2 string) error {
 		Rows:      rows})
 }
 
-func AggregateSeries(s1 DataSeries) DataSeries {
+func AggregateSeries(series DataSeries) DataSeries {
 	aggregate := NewDataSeries()
-	sortedItems := s1.ItemsSorted()
+	sortedItems := series.ItemsSorted()
 	sum := int64(0)
 	for _, atomicItem := range sortedItems {
 		aggregateItem := DataItem{
@@ -351,11 +364,11 @@ func AggregateSeries(s1 DataSeries) DataSeries {
 	return aggregate
 }
 
-func DataSeriesTimeSeries(series *DataSeries, interval timeutil.Interval) []time.Time {
-	return timeutil.TimeSeriesSlice(interval, DataSeriesItemTimes(series))
+func (series *DataSeries) TimeSeries(interval timeutil.Interval) []time.Time {
+	return timeutil.TimeSeriesSlice(interval, series.ItemTimes())
 }
 
-func DataSeriesItemTimes(series *DataSeries) []time.Time {
+func (series *DataSeries) ItemTimes() []time.Time {
 	times := []time.Time{}
 	for _, item := range series.ItemMap {
 		times = append(times, item.Time)
@@ -363,12 +376,14 @@ func DataSeriesItemTimes(series *DataSeries) []time.Time {
 	return times
 }
 
+/*
 func DataSeriesMinMaxTimes(series *DataSeries) (time.Time, time.Time) {
 	return timeutil.SliceMinMax(DataSeriesItemTimes(series))
 }
+*/
 
 func (series *DataSeries) MinMaxTimes() (time.Time, time.Time) {
-	return DataSeriesMinMaxTimes(series)
+	return timeutil.SliceMinMax(series.ItemTimes())
 }
 
 func (ds *DataSeries) Stats() point.PointSet {
diff --git a/data/statictimeseries/data_series_set_mod.go b/data/statictimeseries/data_series_set_mod.go
index 4756362..41f3793 100644
--- a/data/statictimeseries/data_series_set_mod.go
+++ b/data/statictimeseries/data_series_set_mod.go
@@ -6,7 +6,7 @@ import (
 	"github.com/grokify/simplego/time/timeutil"
 )
 
-func (set *DataSeriesSet) ToMonth() DataSeriesSet {
+func (set *DataSeriesSet) ToMonth(inflate bool) DataSeriesSet {
 	newDss := DataSeriesSet{
 		Name:     set.Name,
 		Series:   map[string]DataSeries{},
@@ -14,13 +14,13 @@ func (set *DataSeriesSet) ToMonth() DataSeriesSet {
 		Interval: timeutil.Month,
 		Order:    set.Order}
 	for name, ds := range set.Series {
-		newDss.Series[name] = ds.ToMonth()
+		newDss.Series[name] = ds.ToMonth(inflate)
 	}
 	newDss.Times = newDss.GetTimeSlice(true)
 	return newDss
 }
 
-func (set *DataSeriesSet) ToMonthCumulative(popLast bool) (DataSeriesSet, error) {
+func (set *DataSeriesSet) ToMonthCumulative(popLast, inflate bool) (DataSeriesSet, error) {
 	newDss := DataSeriesSet{
 		Name:     set.Name,
 		Series:   map[string]DataSeries{},
@@ -28,7 +28,7 @@ func (set *DataSeriesSet) ToMonthCumulative(popLast bool) (DataSeriesSet, error)
 		Interval: timeutil.Month,
 		Order:    set.Order}
 	for name, ds := range set.Series {
-		newDs, err := ds.ToMonthCumulative(newDss.Times...)
+		newDs, err := ds.ToMonthCumulative(inflate, newDss.Times...)
 		if err != nil {
 			return newDss, err
 		}