diff --git a/transform/meta_for_each_test.go b/transform/meta_for_each_test.go
index ac666667..96a00e9d 100644
--- a/transform/meta_for_each_test.go
+++ b/transform/meta_for_each_test.go
@@ -202,7 +202,7 @@ var metaForEachTests = []struct {
 		},
 		[]byte(`{"a":["2021-03-06T00:02:57Z","2021-03-06T00:03:57Z","2021-03-06T00:04:57Z"]}`),
 		[][]byte{
-			[]byte(`{"a":["2021-03-06T00:02:57Z","2021-03-06T00:03:57Z","2021-03-06T00:04:57Z"],"b":["1614988977000","1614989037000","1614989097000"]}`),
+			[]byte(`{"a":["2021-03-06T00:02:57Z","2021-03-06T00:03:57Z","2021-03-06T00:04:57Z"],"b":["1614988977000000000","1614989037000000000","1614989097000000000"]}`),
 		},
 	},
 }
diff --git a/transform/time.go b/transform/time.go
index 84c545b5..3a894379 100644
--- a/transform/time.go
+++ b/transform/time.go
@@ -60,12 +60,12 @@ func (c *timePatternConfig) Validate() error {
 }
 
 func timeUnixToBytes(t time.Time) []byte {
-	return []byte(fmt.Sprintf("%d", t.UnixMilli()))
+	return []byte(fmt.Sprintf("%d", t.UnixNano()))
 }
 
-// timeUnixToStr converts a UnixMilli timestamp to a string.
-func timeUnixToStr(timeInt64 int64, timeFmt string, loc string) (string, error) {
-	timeDate := time.UnixMilli(timeInt64)
+// timeUnixToStr converts a UnixNano timestamp to a string.
+func timeUnixToStr(ts int64, timeFmt string, loc string) (string, error) {
+	timeDate := time.Unix(0, ts)
 
 	if loc != "" {
 		ll, err := time.LoadLocation(loc)
diff --git a/transform/time_from_string.go b/transform/time_from_string.go
index 154a588c..bf6b37f2 100644
--- a/transform/time_from_string.go
+++ b/transform/time_from_string.go
@@ -27,8 +27,6 @@ func newTimeFromString(_ context.Context, cfg config.Config) (*timeFromString, e
 	return &tf, nil
 }
 
-// timeFromString is a transform that converts a pattern-based string
-// format to a UnixMilli timestamp.
 type timeFromString struct {
 	conf     timePatternConfig
 	isObject bool
@@ -56,7 +54,7 @@ func (tf *timeFromString) Transform(ctx context.Context, msg *message.Message) (
 	}
 
 	if tf.isObject {
-		if err := msg.SetValue(tf.conf.Object.SetKey, date.UnixMilli()); err != nil {
+		if err := msg.SetValue(tf.conf.Object.SetKey, date.UnixNano()); err != nil {
 			return nil, fmt.Errorf("transform: time_from_string: %v", err)
 		}
 	} else {
diff --git a/transform/time_from_string_test.go b/transform/time_from_string_test.go
index 61ea265b..e6e9e1f5 100644
--- a/transform/time_from_string_test.go
+++ b/transform/time_from_string_test.go
@@ -27,7 +27,7 @@ var timeFromStringTests = []struct {
 		},
 		[]byte(`2021-12-19T01:31:30.000Z`),
 		[][]byte{
-			[]byte(`1639877490000`),
+			[]byte(`1639877490000000000`),
 		},
 	},
 	{
@@ -41,7 +41,7 @@ var timeFromStringTests = []struct {
 		},
 		[]byte(`2021-12-19T01:31:30.000Z`),
 		[][]byte{
-			[]byte(`1639895490000`),
+			[]byte(`1639895490000000000`),
 		},
 	},
 	// object tests
@@ -58,7 +58,7 @@ var timeFromStringTests = []struct {
 		},
 		[]byte(`{"a":"2021-12-19T01:31:30.000Z"}`),
 		[][]byte{
-			[]byte(`{"a":1639877490000}`),
+			[]byte(`{"a":1639877490000000000}`),
 		},
 	},
 }
diff --git a/transform/time_from_unix.go b/transform/time_from_unix.go
index 4cc4963e..49af4fc0 100644
--- a/transform/time_from_unix.go
+++ b/transform/time_from_unix.go
@@ -28,8 +28,6 @@ func newTimeFromUnix(_ context.Context, cfg config.Config) (*timeFromUnix, error
 	return &tf, nil
 }
 
-// TimeFromUnix is a transform that converts a UnixMilli timestamp to a
-// Unix timestamp.
 type timeFromUnix struct {
 	conf     timeUnixConfig
 	isObject bool
@@ -51,16 +49,16 @@ func (tf *timeFromUnix) Transform(ctx context.Context, msg *message.Message) ([]
 		return []*message.Message{msg}, nil
 	}
 
-	// Convert Unix to UnixMilli.
+	// Convert Unix to UnixNano.
 	date := time.Unix(value.Int(), 0)
-	milli := date.UnixMilli()
+	ns := date.UnixNano()
 
 	if tf.isObject {
-		if err := msg.SetValue(tf.conf.Object.SetKey, milli); err != nil {
+		if err := msg.SetValue(tf.conf.Object.SetKey, ns); err != nil {
 			return nil, fmt.Errorf("transform: time_from_unix: %v", err)
 		}
 	} else {
-		value := []byte(fmt.Sprintf("%d", milli))
+		value := []byte(fmt.Sprintf("%d", ns))
 		msg.SetData(value)
 	}
 
diff --git a/transform/time_from_unix_test.go b/transform/time_from_unix_test.go
index b700b907..868503de 100644
--- a/transform/time_from_unix_test.go
+++ b/transform/time_from_unix_test.go
@@ -26,7 +26,7 @@ var timeUnixFromTests = []struct {
 		},
 		[]byte(`1639895490`),
 		[][]byte{
-			[]byte(`1639895490000`),
+			[]byte(`1639895490000000000`),
 		},
 		nil,
 	},
@@ -43,7 +43,7 @@ var timeUnixFromTests = []struct {
 		},
 		[]byte(`{"a":1639877490}`),
 		[][]byte{
-			[]byte(`{"a":1639877490000}`),
+			[]byte(`{"a":1639877490000000000}`),
 		},
 		nil,
 	},
diff --git a/transform/time_now.go b/transform/time_now.go
index f205c038..73e032ef 100644
--- a/transform/time_now.go
+++ b/transform/time_now.go
@@ -54,7 +54,7 @@ func (tf *timeNow) Transform(ctx context.Context, msg *message.Message) ([]*mess
 	date := time.Now()
 
 	if tf.hasObjectSetKey {
-		if err := msg.SetValue(tf.conf.Object.SetKey, date.UnixMilli()); err != nil {
+		if err := msg.SetValue(tf.conf.Object.SetKey, date.UnixNano()); err != nil {
 			return nil, fmt.Errorf("time: now: %v", err)
 		}
 
diff --git a/transform/time_to_string.go b/transform/time_to_string.go
index 6e056336..d7728832 100644
--- a/transform/time_to_string.go
+++ b/transform/time_to_string.go
@@ -27,8 +27,6 @@ func newTimeToString(_ context.Context, cfg config.Config) (*timeToString, error
 	return &tf, nil
 }
 
-// timeToString is a transform that converts a Unix timestamp to a
-// pattern-based string format.
 type timeToString struct {
 	conf     timePatternConfig
 	isObject bool
diff --git a/transform/time_to_string_test.go b/transform/time_to_string_test.go
index dc20864c..395140f5 100644
--- a/transform/time_to_string_test.go
+++ b/transform/time_to_string_test.go
@@ -25,7 +25,7 @@ var timeToStringTests = []struct {
 				"format": timeDefaultFmt,
 			},
 		},
-		[]byte(`1639877490000`),
+		[]byte(`1639877490000000000`),
 		[][]byte{
 			[]byte(`2021-12-19T01:31:30.000Z`),
 		},
@@ -39,7 +39,7 @@ var timeToStringTests = []struct {
 				"location": "America/New_York",
 			},
 		},
-		[]byte(`1639895490000`),
+		[]byte(`1639895490000000000`),
 		[][]byte{
 			[]byte(`2021-12-19T01:31:30.000Z`),
 		},
@@ -56,7 +56,7 @@ var timeToStringTests = []struct {
 				"format": timeDefaultFmt,
 			},
 		},
-		[]byte(`{"a":1639877490000}`),
+		[]byte(`{"a":1639877490000000000}`),
 		[][]byte{
 			[]byte(`{"a":"2021-12-19T01:31:30.000Z"}`),
 		},
diff --git a/transform/time_to_unix.go b/transform/time_to_unix.go
index a83bcb9c..60564aa6 100644
--- a/transform/time_to_unix.go
+++ b/transform/time_to_unix.go
@@ -28,8 +28,6 @@ func newTimeToUnix(_ context.Context, cfg config.Config) (*timeToUnix, error) {
 	return &tf, nil
 }
 
-// timeToUnix is a transform that converts a Unix timestamp to a
-// UnixMilli timestamp.
 type timeToUnix struct {
 	conf     timeUnixConfig
 	isObject bool
@@ -51,8 +49,8 @@ func (tf *timeToUnix) Transform(ctx context.Context, msg *message.Message) ([]*m
 		return []*message.Message{msg}, nil
 	}
 
-	// Convert UnixMilli to Unix.
-	date := time.UnixMilli(value.Int())
+	// Convert UnixNano to Unix.
+	date := time.Unix(0, value.Int())
 	unix := date.Unix()
 
 	if tf.isObject {
diff --git a/transform/time_to_unix_test.go b/transform/time_to_unix_test.go
index 9cae50aa..3dcf042f 100644
--- a/transform/time_to_unix_test.go
+++ b/transform/time_to_unix_test.go
@@ -23,7 +23,7 @@ var timeToUnixTests = []struct {
 		config.Config{
 			Settings: map[string]interface{}{},
 		},
-		[]byte(`1639895490000`),
+		[]byte(`1639895490000000000`),
 		[][]byte{
 			[]byte(`1639895490`),
 		},
@@ -39,7 +39,7 @@ var timeToUnixTests = []struct {
 				},
 			},
 		},
-		[]byte(`{"a":1639877490000}`),
+		[]byte(`{"a":1639877490000000000}`),
 		[][]byte{
 			[]byte(`{"a":1639877490}`),
 		},
diff --git a/transform/transform_test.go b/transform/transform_test.go
index d4b3751d..bf41756e 100644
--- a/transform/transform_test.go
+++ b/transform/transform_test.go
@@ -74,7 +74,7 @@ var transformTests = []struct {
 				"format": "2006-01-02T15:04:05.000000Z",
 			},
 		},
-		[]byte(`1639877490000`),
+		[]byte(`1639877490000000000`),
 		[][]byte{
 			[]byte(`2021-12-19T01:31:30.000000Z`),
 		},