@@ -7,6 +7,7 @@ import (

 	"github.com/docker/docker/daemon/logger"

 	"github.com/docker/docker/pkg/jsonlog"

+	"github.com/docker/docker/pkg/timeutils"

 )

 // JSONFileLogger is Logger implementation for default docker logging:

@@ -33,7 +34,11 @@ func New(filename string) (logger.Logger, error) {

 func (l *JSONFileLogger) Log(msg *logger.Message) error {

 	l.mu.Lock()

 	defer l.mu.Unlock()

-	err := (&jsonlog.JSONLog{Log: string(msg.Line) + "\n", Stream: msg.Source, Created: msg.Timestamp}).MarshalJSONBuf(l.buf)

+	timestamp, err := timeutils.FastMarshalJSON(msg.Timestamp)

+	if err != nil {

+		return err

+	}

+	err = (&jsonlog.JSONLogBytes{Log: append(msg.Line, '\n'), Stream: msg.Source, Created: timestamp}).MarshalJSONBuf(l.buf)

 	if err != nil {

 		return err

 	}