diff --git a/src/pkg/net/http/export_test.go b/src/pkg/net/http/export_test.go
index 271ff4df9c..22b7f27968 100644
--- a/src/pkg/net/http/export_test.go
+++ b/src/pkg/net/http/export_test.go
@@ -16,6 +16,8 @@ func NewLoggingConn(baseName string, c net.Conn) net.Conn {
 	return newLoggingConn(baseName, c)
 }
 
+var ExportAppendTime = appendTime
+
 func (t *Transport) NumPendingRequestsForTesting() int {
 	t.reqMu.Lock()
 	defer t.reqMu.Unlock()
diff --git a/src/pkg/net/http/serve_test.go b/src/pkg/net/http/serve_test.go
index c7c842b2fd..d5ee6e0e8a 100644
--- a/src/pkg/net/http/serve_test.go
+++ b/src/pkg/net/http/serve_test.go
@@ -2080,6 +2080,19 @@ func TestResponseWriterWriteStringAllocs(t *testing.T) {
 	}
 }
 
+func TestAppendTime(t *testing.T) {
+	var b [len(TimeFormat)]byte
+	t1 := time.Date(2013, 9, 21, 15, 41, 0, 0, time.FixedZone("CEST", 2*60*60))
+	res := ExportAppendTime(b[:0], t1)
+	t2, err := ParseTime(string(res))
+	if err != nil {
+		t.Fatalf("Error parsing time: %s", err)
+	}
+	if !t1.Equal(t2) {
+		t.Fatalf("Times differ; expected: %v, got %v (%s)", t1, t2, string(res))
+	}
+}
+
 func BenchmarkClientServer(b *testing.B) {
 	b.ReportAllocs()
 	b.StopTimer()
diff --git a/src/pkg/net/http/server.go b/src/pkg/net/http/server.go
index 67f175fd6e..cc0b4e237b 100644
--- a/src/pkg/net/http/server.go
+++ b/src/pkg/net/http/server.go
@@ -530,11 +530,12 @@ func (ecr *expectContinueReader) Close() error {
 // It is like time.RFC1123 but hard codes GMT as the time zone.
 const TimeFormat = "Mon, 02 Jan 2006 15:04:05 GMT"
 
-// appendTime is a non-allocating version of []byte(time.Now().UTC().Format(TimeFormat))
+// appendTime is a non-allocating version of []byte(t.UTC().Format(TimeFormat))
 func appendTime(b []byte, t time.Time) []byte {
 	const days = "SunMonTueWedThuFriSat"
 	const months = "JanFebMarAprMayJunJulAugSepOctNovDec"
 
+	t = t.UTC()
 	yy, mm, dd := t.Date()
 	hh, mn, ss := t.Clock()
 	day := days[3*t.Weekday():]