logs: change timestamp to ISO (#1708)

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

pkg/router/functionHandler_test.go

@@ -28,6 +28,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
 	fv1 "github.com/fission/fission/pkg/apis/core/v1"
@@ -57,7 +58,11 @@ func TestFunctionProxying(t *testing.T) {
 	log.Printf("Created backend svc at %v", backendURL)
 
 	fnMeta := metav1.ObjectMeta{Name: "foo", Namespace: metav1.NamespaceDefault}
-	logger, err := zap.NewDevelopment()
+
+	config := zap.NewDevelopmentConfig()
+	config.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
+	logger, err := config.Build()
+
 	panicIf(err)
 
 	fmap := makeFunctionServiceMap(logger, 0)
@@ -96,7 +101,10 @@ func TestFunctionProxying(t *testing.T) {
 }
 
 func TestProxyErrorHandler(t *testing.T) {
-	logger, err := zap.NewDevelopment()
+	config := zap.NewDevelopmentConfig()
+	config.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
+	logger, err := config.Build()
+
 	assert.Nil(t, err)
 
 	fh := &functionHandler{