if zone < 0 {
		b = append(b, '-')
		zone = -zone
	} else {
		b = append(b, '+')
	}
	b = appendInt(b, zone/60, 2)
	b = append(b, ':')
	b = appendInt(b, zone%60, 2)
	return b
}

func (t Time) appendStrictRFC3339(b []byte) ([]byte, error) {
	n0 := len(b)
	b = t.appendFormatRFC3339(b, true)

	// Not all valid Go timestamps can be serialized as valid RFC 3339.
	// Explicitly check for these edge cases.

// (e.g., the year is out of range), then an error is reported.
func (t Time) MarshalJSON() ([]byte, error) {
	b := make([]byte, 0, len(RFC3339Nano)+len(`""`))
	b = append(b, '"')
	b, err := t.appendStrictRFC3339(b)
	b = append(b, '"')
	if err != nil {
		return nil, errors.New("Time.MarshalJSON: " + err.Error())
	}
	return b, nil
}

// UnmarshalJSON implements the [json.Unmarshaler] interface.