diff --git a/src/testing/benchmark.go b/src/testing/benchmark.go
index d592afbf87..2d0de180d7 100644
--- a/src/testing/benchmark.go
+++ b/src/testing/benchmark.go
@@ -86,7 +86,7 @@ func (b *B) StartTimer() {
 // want to measure.
 func (b *B) StopTimer() {
 	if b.timerOn {
-		b.duration += time.Now().Sub(b.start)
+		b.duration += time.Since(b.start)
 		runtime.ReadMemStats(&memStats)
 		b.netAllocs += memStats.Mallocs - b.startAllocs
 		b.netBytes += memStats.TotalAlloc - b.startBytes
diff --git a/src/testing/example.go b/src/testing/example.go
index e5bce7af4e..b9955500e6 100644
--- a/src/testing/example.go
+++ b/src/testing/example.go
@@ -87,7 +87,7 @@ func runExample(eg InternalExample) (ok bool) {
 
 	// Clean up in a deferred call so we can recover if the example panics.
 	defer func() {
-		dstr := fmtDuration(time.Now().Sub(start))
+		dstr := fmtDuration(time.Since(start))
 
 		// Close pipe, restore stdout, get output.
 		w.Close()
diff --git a/src/testing/testing.go b/src/testing/testing.go
index 8b4bfc31a8..a170cd0fd9 100644
--- a/src/testing/testing.go
+++ b/src/testing/testing.go
@@ -701,7 +701,7 @@ func tRunner(t *T, fn func(t *T)) {
 			t.Errorf("race detected during execution of test")
 		}
 
-		t.duration += time.Now().Sub(t.start)
+		t.duration += time.Since(t.start)
 		// If the test panicked, print any test output before dying.
 		err := recover()
 		if !t.finished && err == nil {