diff --git a/builder/filter/filter_test.go b/builder/filter/filter_test.go
index deaafc3..15613c8 100644
--- a/builder/filter/filter_test.go
+++ b/builder/filter/filter_test.go
@@ -1,9 +1,12 @@
 package filter
 
 import (
-	"testing"
-
+	"encoding/json"
+	"github.com/grafadruid/go-druid/builder"
+	"github.com/grafadruid/go-druid/builder/intervals"
 	"github.com/stretchr/testify/assert"
+	"testing"
+	"time"
 )
 
 func TestLoadUnsupportedType(t *testing.T) {
@@ -11,7 +14,67 @@ func TestLoadUnsupportedType(t *testing.T) {
 
 	f, err := Load([]byte("{\"type\": \"blahblahType\"}"))
 
-	assert.Nil(f, "filter should be nil")
-	assert.NotNil(err, "error should not be nil")
-	assert.Error(err, "unsupported filter type")
+	assert.Nil(f,
+		"filter should be nil")
+	assert.NotNil(err,
+		"error should not be nil")
+	assert.Error(err,
+		"unsupported filter type")
+}
+
+func TestNewInterval(t *testing.T) {
+	location, _ := time.LoadLocation("UTC")
+	start, _ := time.ParseInLocation(time.RFC3339Nano,
+		"2022-06-16T08:28:53.33441Z",
+		location)
+	end, _ := time.ParseInLocation(time.RFC3339Nano,
+		"2022-06-16T15:28:53.33441Z",
+		location)
+	// simple interval
+	i := intervals.NewInterval().SetInterval(start,
+		end)
+	filter1 := NewSelector().SetDimension("countryName").SetValue("France")
+	filterInterval := NewInterval().SetIntervals([]*intervals.Interval{i}).SetDimension("__time")
+	filters := NewOr().SetFields([]builder.Filter{filter1, filterInterval})
+
+	t.Run("marshal filter with interval",
+		func(t *testing.T) {
+			f, err := json.Marshal(filters)
+			assert.Nil(t,
+				err)
+
+			assert.Nil(t,
+				err)
+			assert.Equal(t,
+				`{"type":"or","fields":[{"type":"selector","dimension":"countryName","value":"France"},{"type":"interval","dimension":"__time","intervals":["2022-06-16T08:28:53.33441Z/2022-06-16T15:28:53.33441Z"]}]}`,
+				string(f),
+				"filter with time interval")
+		})
+
+	t.Run("marshal load marshal filter with interval",
+		func(t *testing.T) {
+			f, err := json.Marshal(filters)
+			assert.Nil(t,
+				err)
+
+			filterWithIntervalObj, err := Load(f)
+			assert.Nil(t,
+				err)
+			assert.NotNil(t,
+				filterWithIntervalObj)
+			assert.Equal(t,
+				filters,
+				filterWithIntervalObj)
+
+			fJson, err := json.Marshal(filterWithIntervalObj)
+			assert.Nil(t,
+				err)
+
+			assert.Nil(t,
+				err)
+			assert.Equal(t,
+				`{"type":"or","fields":[{"type":"selector","dimension":"countryName","value":"France"},{"type":"interval","dimension":"__time","intervals":["2022-06-16T08:28:53.33441Z/2022-06-16T15:28:53.33441Z"]}]}`,
+				string(fJson),
+				"filter with time interval")
+		})
 }
diff --git a/builder/filter/interval.go b/builder/filter/interval.go
index f31f221..1b2bcd3 100644
--- a/builder/filter/interval.go
+++ b/builder/filter/interval.go
@@ -10,10 +10,10 @@ import (
 
 type Interval struct {
 	Base
-	Dimension    string               `json:"dimension,omitempty"`
-	Intervals    builder.Intervals    `json:"intervals,omitempty"`
-	ExtractionFn builder.ExtractionFn `json:"extractionFn,omitempty"`
-	FilterTuning *FilterTuning        `json:"filterTuning,omitempty"`
+	Dimension    string                `json:"dimension,omitempty"`
+	Intervals    []*intervals.Interval `json:"intervals,omitempty"`
+	ExtractionFn builder.ExtractionFn  `json:"extractionFn,omitempty"`
+	FilterTuning *FilterTuning         `json:"filterTuning,omitempty"`
 }
 
 func NewInterval() *Interval {
@@ -27,7 +27,7 @@ func (i *Interval) SetDimension(dimension string) *Interval {
 	return i
 }
 
-func (i *Interval) SetIntervals(intervals builder.Intervals) *Interval {
+func (i *Interval) SetIntervals(intervals []*intervals.Interval) *Interval {
 	i.Intervals = intervals
 	return i
 }
@@ -51,7 +51,8 @@ func (i *Interval) UnmarshalJSON(data []byte) error {
 		ExtractionFn json.RawMessage `json:"extractionFn,omitempty"`
 		FilterTuning *FilterTuning   `json:"filterTuning,omitempty"`
 	}
-	if err = json.Unmarshal(data, &tmp); err != nil {
+	if err = json.Unmarshal(data,
+		&tmp); err != nil {
 		return err
 	}
 	var e builder.ExtractionFn
@@ -61,9 +62,10 @@ func (i *Interval) UnmarshalJSON(data []byte) error {
 			return err
 		}
 	}
-	var ii builder.Intervals
+	var ii []*intervals.Interval
 	if tmp.Intervals != nil {
-		ii, err = intervals.Load(tmp.Intervals)
+		err = json.Unmarshal(tmp.Intervals,
+			&ii)
 		if err != nil {
 			return err
 		}
diff --git a/builder/intervals/default.go b/builder/intervals/default.go
index 1257152..d0cb1a2 100644
--- a/builder/intervals/default.go
+++ b/builder/intervals/default.go
@@ -1,7 +1,5 @@
 package intervals
 
-import "encoding/json"
-
 type Intervals struct {
 	Base
 	Intervals []*Interval `json:"intervals,omitempty"`
@@ -17,7 +15,3 @@ func (i *Intervals) SetIntervals(intervals []*Interval) *Intervals {
 	i.Intervals = intervals
 	return i
 }
-
-func (i *Intervals) MarshalJSON() ([]byte, error) {
-	return json.Marshal(i.Intervals)
-}
diff --git a/builder/intervals/intervals_test.go b/builder/intervals/intervals_test.go
index 91511aa..5353b77 100644
--- a/builder/intervals/intervals_test.go
+++ b/builder/intervals/intervals_test.go
@@ -1,17 +1,103 @@
 package intervals
 
 import (
+	"encoding/json"
+	"fmt"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 )
 
-func TestLoadUnsupportedType(t *testing.T) {
+func TestIntervals_Load(t *testing.T) {
 	assert := assert.New(t)
+	t.Run("test unsupported type",
+		func(t *testing.T) {
+			f, err := Load([]byte("{\"type\": \"blahblahType\"}"))
 
-	f, err := Load([]byte("{\"type\": \"blahblahType\"}"))
+			assert.Nil(f,
+				"filter should be nil")
+			assert.NotNil(err,
+				"error should not be nil")
+			assert.Error(err,
+				"unsupported intervals type")
+		})
 
-	assert.Nil(f, "filter should be nil")
-	assert.NotNil(err, "error should not be nil")
-	assert.Error(err, "unsupported intervals type")
+	t.Run("simple interval not supported",
+		func(t *testing.T) {
+			f, err := Load([]byte(`"2022-06-16T08:28:53.33441Z/2022-06-16T15:28:53.33441Z"`))
+
+			assert.Nil(f,
+				"filter should be nil")
+			assert.NotNil(err,
+				"error should not be nil")
+			assert.Error(err,
+				"unsupported intervals type")
+		})
+
+	t.Run("complex interval supported",
+		func(t *testing.T) {
+			f, err := Load([]byte(`{"type":"intervals","intervals":["2022-06-16T08:28:53.33441Z/2022-06-16T15:28:53.33441Z"]}`))
+			location, _ := time.LoadLocation("UTC")
+			start, _ := time.ParseInLocation(time.RFC3339Nano,
+				"2022-06-16T08:28:53.33441Z",
+				location)
+			end, _ := time.ParseInLocation(time.RFC3339Nano,
+				"2022-06-16T15:28:53.33441Z",
+				location)
+			// simple interval
+			interval := NewInterval().SetInterval(start,
+				end)
+			// complex intervals
+			intervals := NewIntervals().SetIntervals([]*Interval{interval})
+
+			assert.Nil(err,
+				"error should be nil")
+			assert.Equal(intervals,
+				f,
+				"loaded intervals match the built intervals")
+		})
+}
+
+func TestIntervals_MarshalJSON(t *testing.T) {
+	location, _ := time.LoadLocation("UTC")
+	start, _ := time.ParseInLocation(time.RFC3339Nano,
+		"2022-06-16T08:28:53.33441Z",
+		location)
+	end, _ := time.ParseInLocation(time.RFC3339Nano,
+		"2022-06-16T15:28:53.33441Z",
+		location)
+	// simple interval
+	interval := NewInterval().SetInterval(start,
+		end)
+	// complex intervals
+	intervals := NewIntervals().SetIntervals([]*Interval{interval})
+
+	t.Run("simple interval returns a string",
+		func(t *testing.T) {
+			f, err := json.Marshal(interval)
+			if err != nil {
+				fmt.Println(err.Error())
+			}
+			assert.Nil(t,
+				err)
+			assert.Equal(t,
+				`"2022-06-16T08:28:53.33441Z/2022-06-16T15:28:53.33441Z"`,
+				string(f),
+				"simple interval returns a string")
+		})
+
+	t.Run("marshal generates complex interval type",
+		func(t *testing.T) {
+			f, err := json.Marshal(intervals)
+			if err != nil {
+				fmt.Println(err.Error())
+			}
+			assert.Nil(t,
+				err)
+			assert.Equal(t,
+				`{"type":"intervals","intervals":["2022-06-16T08:28:53.33441Z/2022-06-16T15:28:53.33441Z"]}`,
+				string(f),
+				"complex interval returns a struct")
+		})
 }