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1 General Part
Chapter 1- Criminal Law and its Application
Article 3
Operation in time of the criminal law
No one may be sentenced for an act that, according to the law into power at the time it was committed, did not constitute a criminal act.
A new law that does not incriminate a criminal act has retroactive effect. If the person has been sentenced, the enforcement of the sentence shall not commence and, if it has commenced, it shall cease.
If a law in force at the time when a criminal act has been committed differs from a subsequent law, the law whose provisions are more favorable to the person who has committed the criminal act shall apply
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.