Part I. General Provisions
Introductory Provisions
Section 3. If the criminal legislation has been amended in the period following the commission of an act, the penal provisions in force at the time of its commission shall be applicable to the act unless otherwise provided.
The penal provisions in force at the time a particular issue is decided shall be applicable when they lead to a decision more favourable to the person charged than the provisions in force at the time of commission of the act. However, in the case of an appeal, interlocutory appeal, or a petition for reopening a case, no account shall be taken of provisions that come into force only after the decision occasioning the appeal, interlocutory appeal, or petition for reopening the case, has been made.
If a prosecution or execution of sentence has been lawfully commenced, no account shall be taken of the fact that by a subsequent enactment the right to prosecute or to execute sentence is statute-barred or the prosecution is made dependent on an application by the aggrieved person or is left to him.
The time-limit prescribed by a new statute for an aggrieved person's right to prosecute or to apply for a prosecution shall in no case begin to run until the said statute comes into force.
EDIT.