bytesconv.go
func ParseHTTPDate(date []byte) (time.Time, error) {
	return time.Parse(time.RFC1123, b2s(date))
}
func ParseHTTPDate(date []byte) (time.Time, error) {
	return time.Parse(time.RFC1123, b2s(date))
}
// ParseHTTPDate parses HTTP-compliant (RFC1123) date.