diff --git a/date/util.go b/date/util.go
index 0432681..6646146 100644
--- a/date/util.go
+++ b/date/util.go
@@ -73,6 +73,8 @@ var (
 // HolidayProvider is a function that returns if a given time falls on a holiday.
 type HolidayProvider func(time.Time) bool
 
+func DefaultHolidayProvider(_ time.Time) bool { return false }
+
 // IsNYSEHoliday returns if a date was/is on a nyse holiday day.
 func IsNYSEHoliday(t time.Time) bool {
 	te := t.In(Eastern())
@@ -241,6 +243,10 @@ func NextMarketOpen(after, openTime time.Time, isHoliday HolidayProvider) time.T
 	afterEastern := after.In(Eastern())
 	todaysOpen := On(openTime, afterEastern)
 
+	if isHoliday == nil {
+		isHoliday = DefaultHolidayProvider
+	}
+
 	if afterEastern.Before(todaysOpen) && IsWeekDay(todaysOpen.Weekday()) && !isHoliday(todaysOpen) {
 		return todaysOpen
 	}
@@ -262,6 +268,10 @@ func NextMarketOpen(after, openTime time.Time, isHoliday HolidayProvider) time.T
 func NextMarketClose(after, closeTime time.Time, isHoliday HolidayProvider) time.Time {
 	afterEastern := after.In(Eastern())
 
+	if isHoliday == nil {
+		isHoliday = DefaultHolidayProvider
+	}
+
 	todaysClose := On(closeTime, afterEastern)
 	if afterEastern.Before(todaysClose) && IsWeekDay(todaysClose.Weekday()) && !isHoliday(todaysClose) {
 		return todaysClose
@@ -292,7 +302,7 @@ func CalculateMarketSecondsBetween(start, end, marketOpen, marketClose time.Time
 		seconds += int64(startMarketClose.Sub(se) / time.Second)
 	}
 
-	cursor := NextMarketOpen(startMarketClose, marketClose, isHoliday)
+	cursor := NextMarketOpen(startMarketClose, marketOpen, isHoliday)
 	for BeforeDate(cursor, ee) {
 		if IsWeekDay(cursor.Weekday()) && !isHoliday(cursor) {
 			close := NextMarketClose(cursor, marketClose, isHoliday)
diff --git a/date/util_test.go b/date/util_test.go
index 9f9da52..7310cec 100644
--- a/date/util_test.go
+++ b/date/util_test.go
@@ -34,15 +34,15 @@ func TestNextMarketOpen(t *testing.T) {
 
 	weekend := time.Date(2016, 07, 23, 9, 31, 0, 0, Eastern())
 
-	assert.True(todayOpen.Equal(NextMarketOpen(beforeOpen)))
-	assert.True(tomorrowOpen.Equal(NextMarketOpen(afterOpen)))
-	assert.True(mondayOpen.Equal(NextMarketOpen(afterFriday)))
-	assert.True(mondayOpen.Equal(NextMarketOpen(weekend)))
+	assert.True(todayOpen.Equal(NextMarketOpen(beforeOpen, NYSEOpen, IsNYSEHoliday)))
+	assert.True(tomorrowOpen.Equal(NextMarketOpen(afterOpen, NYSEOpen, IsNYSEHoliday)))
+	assert.True(mondayOpen.Equal(NextMarketOpen(afterFriday, NYSEOpen, IsNYSEHoliday)))
+	assert.True(mondayOpen.Equal(NextMarketOpen(weekend, NYSEOpen, IsNYSEHoliday)))
 
 	testRegression := time.Date(2016, 07, 18, 16, 0, 0, 0, Eastern())
 	shouldbe := time.Date(2016, 07, 19, 9, 30, 0, 0, Eastern())
 
-	assert.True(shouldbe.Equal(NextMarketOpen(testRegression)))
+	assert.True(shouldbe.Equal(NextMarketOpen(testRegression, NYSEOpen, IsNYSEHoliday)))
 }
 
 func TestNextMarketClose(t *testing.T) {
@@ -59,10 +59,10 @@ func TestNextMarketClose(t *testing.T) {
 
 	weekend := time.Date(2016, 07, 23, 9, 31, 0, 0, Eastern())
 
-	assert.True(todayClose.Equal(NextMarketClose(beforeClose)))
-	assert.True(tomorrowClose.Equal(NextMarketClose(afterClose)))
-	assert.True(mondayClose.Equal(NextMarketClose(afterFriday)))
-	assert.True(mondayClose.Equal(NextMarketClose(weekend)))
+	assert.True(todayClose.Equal(NextMarketClose(beforeClose, NYSEClose, IsNYSEHoliday)))
+	assert.True(tomorrowClose.Equal(NextMarketClose(afterClose, NYSEClose, IsNYSEHoliday)))
+	assert.True(mondayClose.Equal(NextMarketClose(afterFriday, NYSEClose, IsNYSEHoliday)))
+	assert.True(mondayClose.Equal(NextMarketClose(weekend, NYSEClose, IsNYSEHoliday)))
 }
 
 func TestCalculateMarketSecondsBetween(t *testing.T) {
@@ -73,7 +73,7 @@ func TestCalculateMarketSecondsBetween(t *testing.T) {
 
 	shouldbe := 5 * 6.5 * 60 * 60
 
-	assert.Equal(shouldbe, CalculateMarketSecondsBetween(start, end))
+	assert.Equal(shouldbe, CalculateMarketSecondsBetween(start, end, NYSEOpen, NYSEClose, IsNYSEHoliday))
 }
 
 func TestCalculateMarketSecondsBetweenLTM(t *testing.T) {
@@ -83,5 +83,5 @@ func TestCalculateMarketSecondsBetweenLTM(t *testing.T) {
 	end := time.Date(2016, 07, 01, 9, 30, 0, 0, Eastern())
 
 	shouldbe := 253 * 6.5 * 60 * 60 //253 full market days since this date last year.
-	assert.Equal(shouldbe, CalculateMarketSecondsBetween(start, end))
+	assert.Equal(shouldbe, CalculateMarketSecondsBetween(start, end, NYSEOpen, NYSEClose, IsNYSEHoliday))
 }
diff --git a/examples/stock_analysis/main.go b/examples/stock_analysis/main.go
index 89fc527..69a4501 100644
--- a/examples/stock_analysis/main.go
+++ b/examples/stock_analysis/main.go
@@ -47,7 +47,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 		YAxis: chart.YAxis{
 			Style: chart.Style{Show: true},
-			Range: chart.Range{
+			Range: &chart.ContinuousRange{
 				Max: 220.0,
 				Min: 180.0,
 			},