Part 1
Jurisdiction

10A Criminal enactments not to have retrospective effect

Notwithstanding any other enactment or rule of law to the contrary, no person shall be liable in any criminal proceedings in respect of an act or omission by him if, at the time of the act or omission, the act or omission by him did not constitute an offence.

Article 11
Jurisdiction ratione temporis
2. If a State becomes a Party to this Statute after its entry into force, the Court may exercise its jurisdiction only with respect to crimes committed after the entry into force of this Statute for that State, unless that State has made a declaration under article 12, paragraph 3.

Article 24
Non-retroactivity ratione personae
1. No person shall be criminally responsible under this Statute for conduct prior to the entry into force of the Statute.
2. In the event of a change in the law applicable to a given case prior to a final judgement, the law more favourable to the person being investigated, prosecuted or convicted shall apply.