General Part
Section 1.
Criminal legislation
Chapter 2.
Operation of the criminal law in time and space
Article 13. Retroactive effect of criminal law.
1. The law eliminating the criminality of the act, mitigating the punishment or improving the status of the criminal in any way, has retroactive effect, i.e., this law is extended to the persons who committed this act before this law had taken effect, including those persons who are serving the punishment or served the punishment, but have a record of conviction.
2. The law stipulating the criminality of the act, making the punishment more severe or worsening the status of the criminal in any other way, has no retroactive effect.
3. The law partially mitigating the punishment and, in the meantime, partially making the punishment more severe has retroactive effect only in respect to the part which mitigates the punishment .
EDIT.