Issue #29: use time.UTC instead of time.LoadLocation, since this call may fail on systems without certain config files

bytesconv.go

@@ -12,14 +12,6 @@ import (
 	"unsafe"
 )
 
-var gmtLocation = func() *time.Location {
-	x, err := time.LoadLocation("GMT")
-	if err != nil {
-		panic(fmt.Sprintf("cannot load GMT location: %s", err))
-	}
-	return x
-}()
-
 // AppendIPv4 appends string representation of the given ip v4 to dst
 // and returns the extended dst.
 func AppendIPv4(dst []byte, ip net.IP) []byte {
@@ -78,7 +70,9 @@ func ParseIPv4(dst net.IP, ipStr []byte) (net.IP, error) {
 // AppendHTTPDate appends HTTP-compliant (RFC1123) representation of date
 // to dst and returns the extended dst.
 func AppendHTTPDate(dst []byte, date time.Time) []byte {
-	return date.In(gmtLocation).AppendFormat(dst, time.RFC1123)
+	dst = date.In(time.UTC).AppendFormat(dst, time.RFC1123)
+	copy(dst[len(dst)-3:], strGMT)
+	return dst
 }
 
 // ParseHTTPDate parses HTTP-compliant (RFC1123) date.

cookie.go

@@ -218,7 +218,7 @@ func (c *Cookie) ParseBytes(src []byte) error {
 		switch {
 		case bytes.Equal(strCookieExpires, kv.key):
 			v := unsafeBytesToStr(kv.value)
-			exptime, err := time.ParseInLocation(time.RFC1123, v, gmtLocation)
+			exptime, err := time.ParseInLocation(time.RFC1123, v, time.UTC)
 			if err != nil {
 				return err
 			}

fs.go

@@ -938,7 +938,7 @@ func fsLastModified(path string) (time.Time, error) {
 }
 
 func fsModTime(t time.Time) time.Time {
-	return t.In(gmtLocation).Truncate(time.Second)
+	return t.In(time.UTC).Truncate(time.Second)
 }
 
 var (

strings.go

@@ -18,6 +18,7 @@ var (
 	strHTTP11           = []byte("HTTP/1.1")
 	strColonSlashSlash  = []byte("://")
 	strColonSpace       = []byte(": ")
+	strGMT              = []byte("GMT")
 
 	strResponseContinue = []byte("HTTP/1.1 100 Continue\r\n\r\n")