From c2b7fb3902b9069e24a79343bcad464941e54625 Mon Sep 17 00:00:00 2001
From: Dmitry Chestnykh <dchest@gmail.com>
Date: Sun, 22 Sep 2013 19:53:55 -0700
Subject: [PATCH] net/http: send correct time in Date header.

Date header indicated that it contained GMT time,
however it actually sent local time. Fixed by
converting time to UTC.

Also fixes incorrect comment in appendTime().

Regression since CL 9432046.

R=golang-dev, dave, bradfitz
CC=golang-dev
https://golang.org/cl/13386047
---
 src/pkg/net/http/export_test.go |  2 ++
 src/pkg/net/http/serve_test.go  | 13 +++++++++++++
 src/pkg/net/http/server.go      |  3 ++-
 3 files changed, 17 insertions(+), 1 deletion(-)

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():]
-- 
2.50.0