diff --git a/amazon_transcribe_handler.go b/amazon_transcribe_handler.go
index eeb0d11..ee6b65a 100644
--- a/amazon_transcribe_handler.go
+++ b/amazon_transcribe_handler.go
@@ -6,6 +6,7 @@ import (
 	"errors"
 	"io"
 	"sync"
+	"time"
 
 	"github.com/aws/aws-sdk-go/service/transcribestreamingservice"
 	zlog "github.com/rs/zerolog/log"
@@ -77,6 +78,11 @@ func (ar *AwsResult) SetMessage(message string) *AwsResult {
 	return ar
 }
 
+func (ar *AwsResult) SetTimestamp() *AwsResult {
+	ar.Timestamp = time.Now().UTC().Format(time.RFC3339Nano)
+	return ar
+}
+
 func (h *AmazonTranscribeHandler) UpdateRetryCount() int {
 	defer h.mu.Unlock()
 	h.mu.Lock()
@@ -170,6 +176,7 @@ func (h *AmazonTranscribeHandler) Handle(ctx context.Context, reader io.Reader)
 									message = *alt.Transcript
 								}
 								result.SetMessage(message)
+								result.SetTimestamp()
 								if err := encoder.Encode(result); err != nil {
 									w.CloseWithError(err)
 									return
diff --git a/handler.go b/handler.go
index cec4245..fa32c10 100644
--- a/handler.go
+++ b/handler.go
@@ -25,9 +25,10 @@ var (
 )
 
 type TranscriptionResult struct {
-	Message string `json:"message,omitempty"`
-	Reason  string `json:"reason,omitempty"`
-	Type    string `json:"type"`
+	Message   string `json:"message,omitempty"`
+	Reason    string `json:"reason,omitempty"`
+	Type      string `json:"type"`
+	Timestamp string `json:"timestamp"`
 }
 
 func NewSuzuErrorResponse(err error) TranscriptionResult {
diff --git a/speech_to_text_handler.go b/speech_to_text_handler.go
index 5c85fd6..4a50034 100644
--- a/speech_to_text_handler.go
+++ b/speech_to_text_handler.go
@@ -8,6 +8,7 @@ import (
 	"io"
 	"strings"
 	"sync"
+	"time"
 
 	zlog "github.com/rs/zerolog/log"
 
@@ -73,6 +74,11 @@ func (gr *GcpResult) SetMessage(message string) *GcpResult {
 	return gr
 }
 
+func (gr *GcpResult) SetTimestamp() *GcpResult {
+	gr.Timestamp = time.Now().UTC().Format(time.RFC3339Nano)
+	return gr
+}
+
 func (h *SpeechToTextHandler) UpdateRetryCount() int {
 	defer h.mu.Unlock()
 	h.mu.Lock()
@@ -240,6 +246,7 @@ func (h *SpeechToTextHandler) Handle(ctx context.Context, reader io.Reader) (*io
 						}
 						transcript := alternative.Transcript
 						result.SetMessage(transcript)
+						result.SetTimestamp()
 						if err := encoder.Encode(result); err != nil {
 							w.CloseWithError(err)
 							return
diff --git a/test_handler.go b/test_handler.go
index e264439..d616660 100644
--- a/test_handler.go
+++ b/test_handler.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"sync"
+	"time"
 
 	zlog "github.com/rs/zerolog/log"
 )
@@ -55,6 +56,11 @@ func NewTestResult(channelID, message string) TestResult {
 	}
 }
 
+func (tr *TestResult) SetTimestamp() *TestResult {
+	tr.Timestamp = time.Now().UTC().Format(time.RFC3339Nano)
+	return tr
+}
+
 func (h *TestHandler) UpdateRetryCount() int {
 	defer h.mu.Unlock()
 	h.mu.Lock()
@@ -114,6 +120,7 @@ func (h *TestHandler) Handle(ctx context.Context, reader io.Reader) (*io.PipeRea
 						return
 					}
 				} else {
+					result.SetTimestamp()
 					if err := encoder.Encode(result); err != nil {
 						w.CloseWithError(err)
 						return