4 files changed, 4 insertions, 4 deletions
diff --git a/src/runtime/gc_test.go b/src/runtime/gc_test.go
index 122818fbfe..0b2c972d3f 100644
--- a/src/runtime/gc_test.go
+++ b/src/runtime/gc_test.go
@@ -689,7 +689,7 @@ func BenchmarkReadMemStatsLatency(b *testing.B) {
 		time.Sleep(100 * time.Millisecond)
 		start := time.Now()
 		runtime.ReadMemStats(&ms)
-		latencies = append(latencies, time.Now().Sub(start))
+		latencies = append(latencies, time.Since(start))
 	}
 	// Make sure to stop the timer before we wait! The load created above
 	// is very heavy-weight and not easy to stop, so we could end up
diff --git a/src/runtime/metrics_test.go b/src/runtime/metrics_test.go
index b4d921b82e..d981c8ee00 100644
--- a/src/runtime/metrics_test.go
+++ b/src/runtime/metrics_test.go
@@ -375,7 +375,7 @@ func BenchmarkReadMetricsLatency(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		start := time.Now()
 		metrics.Read(samples)
-		latencies = append(latencies, time.Now().Sub(start))
+		latencies = append(latencies, time.Since(start))
 	}
 	// Make sure to stop the timer before we wait! The load created above
 	// is very heavy-weight and not easy to stop, so we could end up
diff --git a/src/runtime/runtime_test.go b/src/runtime/runtime_test.go
index 018a8dbaa6..2faf06e2b9 100644
--- a/src/runtime/runtime_test.go
+++ b/src/runtime/runtime_test.go
@@ -377,7 +377,7 @@ func BenchmarkGoroutineProfile(b *testing.B) {
 				if !ok {
 					b.Fatal("goroutine profile failed")
 				}
-				latencies = append(latencies, time.Now().Sub(start))
+				latencies = append(latencies, time.Since(start))
 			}
 			b.StopTimer()
 
diff --git a/src/runtime/testdata/testprog/gc.go b/src/runtime/testdata/testprog/gc.go
index 0f44575381..5dc85fbb62 100644
--- a/src/runtime/testdata/testprog/gc.go
+++ b/src/runtime/testdata/testprog/gc.go
@@ -396,7 +396,7 @@ func gcMemoryLimit(gcPercent int) {
 		// should do considerably better than this bound.
 		bound := int64(myLimit + 16<<20)
 		start := time.Now()
-		for time.Now().Sub(start) < 200*time.Millisecond {
+		for time.Since(start) < 200*time.Millisecond {
 			metrics.Read(m[:])
 			retained := int64(m[0].Value.Uint64() - m[1].Value.Uint64())
 			if retained > bound {