}

func appendFourDigits(dst []byte, v int) []byte {
	return append(dst,
		byte('0'+(v/1000)%10),
		byte('0'+(v/100)%10),
		byte('0'+(v/10)%10),
		byte('0'+v%10))
}

func outsideUTCRange(t time.Time) bool {
	year := t.Year()
	return year < 1950 || year >= 2050
}

func makeUTCTime(t time.Time) (e encoder, err error) {
	dst := make([]byte, 0, 18)

	dst, err = appendUTCTime(dst, t)