stdFracSecond9 | 8<<stdArgShift: ".99999999",
	stdFracSecond9 | 9<<stdArgShift: ".999999999",
}

var Quote = quote

var AppendInt = appendInt
var AppendFormatAny = Time.appendFormat
var AppendFormatRFC3339 = Time.appendFormatRFC3339
var ParseAny = parse

// with the second most popular format only being used 8% of the time.
// The overwhelming use of RFC 3339 compared to all other formats justifies
// the addition of logic to optimize formatting and parsing.

func (t Time) appendFormatRFC3339(b []byte, nanos bool) []byte {
	_, offset, abs := t.locabs()

	// Format date.
	year, month, day, _ := absDate(abs, true)
	b = appendInt(b, year, 4)
	b = append(b, '-')
	b = appendInt(b, int(month), 2)

			loc = FixedZone("", tzOffset)
		}
		ts := Unix(sec, nsec).In(loc)

		got := AppendFormatRFC3339(ts, nil, false)
		want := AppendFormatAny(ts, nil, RFC3339)
		if !bytes.Equal(got, want) {
			t.Errorf("Format(%s, RFC3339) mismatch:\n\tgot:  %s\n\twant: %s", ts, got, want)
		}

		gotNanos := AppendFormatRFC3339(ts, nil, true)
		wantNanos := AppendFormatAny(ts, nil, RFC3339Nano)

func (t Time) AppendFormat(b []byte, layout string) []byte {
	// Optimize for RFC3339 as it accounts for over half of all representations.
	switch layout {
	case RFC3339:
		return t.appendFormatRFC3339(b, false)
	case RFC3339Nano:
		return t.appendFormatRFC3339(b, true)
	default:
		return t.appendFormat(b, layout)
	}
}

func (t Time) appendFormat(b []byte, layout string) []byte {
	var (
		name, offset, abs = t.locabs()