PART 2 - INTERNATIONAL CRIMES AND OFFENCES AGAINST ADMINISTRATION OF JUSTICE
Jurisdiction to try international crimes
8.
Jurisdiction in respect of international crimes—
(1) Proceedings may be brought for an offence—
(a)against section 9 or section 10, if the act constituting the offence charged is alleged to have occurred—
(i)on or after the commencement of this section; or
(ii)on or after the applicable date but before the commencement of this section; and would have been an offence under the law of New Zealand in force at the time the act occurred, had it occurred in New Zealand; and
(b)against section 11, if the act constituting the offence charged is alleged to have occurred on or after the commencement of this section; and
Jurisdiction ratione temporis
Non-retroactivity
Nullum crimen sine lege
EDIT.