logs: change timestamp to ISO (#1708)

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

pkg/router/router_test.go

@@ -23,6 +23,7 @@ import (
 	"time"
 
 	"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"
@@ -43,7 +44,9 @@ func TestRouter(t *testing.T) {
 	testResponseString := "hi"
 	testServiceUrl := createBackendService(testResponseString)
 
-	logger, err := zap.NewDevelopment()
+	config := zap.NewDevelopmentConfig()
+	config.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
+	logger, err := config.Build()
 	panicIf(err)
 
 	// set up the cache with this fake service