7. Objection to proceedings.

It shall not be an objection to any proceedings taken against a person by virtue of the provisions of sections 6 and 7 that under the law in force at the time when and in the place where he is alleged to commit the act of which he was accused or of which he was convicted he could not have been punished therefor.

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.