diff --git a/staging/src/k8s.io/apiserver/pkg/server/options/encryptionconfig/config.go b/staging/src/k8s.io/apiserver/pkg/server/options/encryptionconfig/config.go
index 82b245a7a82..4413ace2fce 100644
--- a/staging/src/k8s.io/apiserver/pkg/server/options/encryptionconfig/config.go
+++ b/staging/src/k8s.io/apiserver/pkg/server/options/encryptionconfig/config.go
@@ -135,7 +135,7 @@ func (h *kmsPluginProbe) Check() error {
 	h.l.Lock()
 	defer h.l.Unlock()
 
-	if (time.Now().Sub(h.lastResponse.received)) < kmsPluginHealthzTTL {
+	if (time.Since(h.lastResponse.received)) < kmsPluginHealthzTTL {
 		return h.lastResponse.err
 	}
 
diff --git a/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/aggregator.go b/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/aggregator.go
index db026594831..1be3d0c939d 100644
--- a/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/aggregator.go
+++ b/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/aggregator.go
@@ -108,7 +108,7 @@ func BuildAndRegisterAggregator(downloader *Downloader, delegationTarget server.
 	// Build initial spec to serve.
 	klog.V(2).Infof("Building initial OpenAPI spec")
 	defer func(start time.Time) {
-		duration := time.Now().Sub(start)
+		duration := time.Since(start)
 		klog.V(2).Infof("Finished initial OpenAPI spec generation after %v", duration)
 
 		regenerationCounter.With(map[string]string{"apiservice": "*", "reason": "startup"})
@@ -222,7 +222,7 @@ func (s *specAggregator) tryUpdatingServiceSpecs(specInfo *openAPISpecInfo) erro
 	}
 	klog.V(2).Infof("Updating OpenAPI spec because %s is updated", specInfo.apiService.Name)
 	defer func(start time.Time) {
-		duration := time.Now().Sub(start)
+		duration := time.Since(start)
 		klog.V(2).Infof("Finished OpenAPI spec generation after %v", duration)
 
 		reason := "add"
@@ -254,7 +254,7 @@ func (s *specAggregator) tryDeleteServiceSpecs(apiServiceName string) error {
 	delete(s.openAPISpecs, apiServiceName)
 	klog.V(2).Infof("Updating OpenAPI spec because %s is removed", apiServiceName)
 	defer func(start time.Time) {
-		duration := time.Now().Sub(start)
+		duration := time.Since(start)
 		klog.V(2).Infof("Finished OpenAPI spec generation after %v", duration)
 
 		regenerationCounter.With(map[string]string{"apiservice": apiServiceName, "reason": "delete"})