(1)  If an enactment increases the penalty for an offence or the maximum or minimum penalty for an offence, the increase applies only to offences committed after the commencement of the provisions of the enactment effecting the increase.

(2)  If an enactment reduces the penalty for an offence or the maximum or minimum penalty for an offence, the reduction extends to offences committed before the commencement of the provisions of the enactment effecting the reduction for which no penalty had been imposed at that commencement.