func (t Time) MarshalCBOR() ([]byte, error) {
	if t.IsZero() {
		return cbor.Marshal(nil)
	}

	return cbor.Marshal(t.UTC().Format(time.RFC3339))
}

// ToUnstructured implements the value.UnstructuredConverter interface.
func (t Time) ToUnstructured() interface{} {
	if t.IsZero() {
		return nil
	}
	buf := make([]byte, 0, len(time.RFC3339))
	buf = t.UTC().AppendFormat(buf, time.RFC3339)
	return string(buf)
}