logs: change timestamp to ISO (#1708)

Co-authored-by: Vishal <vishal-biyani@users.noreply.github.com>

environments/tensorflow-serving/server.go

@@ -16,6 +16,7 @@ import (
 
 	"github.com/pkg/errors"
 	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 )
 
 const (
@@ -188,7 +189,11 @@ func readinessProbeHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func main() {
-	logger, err := zap.NewProduction()
+
+	config := zap.NewProductionConfig()
+	config.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
+	logger, err := config.Build()
+
 	if err != nil {
 		log.Fatalf("can't initialize zap logger: %v", err)
 	}