(1) Where a provision of a law of the Commonwealth increases the penalty or maximum penalty for an offence, the penalty or maximum penalty as increased applies only to offences committed after the commencement of that provision.
(2) Where a provision of a law of the Commonwealth reduces the
penalty or maximum penalty for an offence, the penalty or maximum penalty as
reduced extends to offences committed before the commencement of that
provision, but the reduction does not affect any penalty imposed before that
commencement.