What the official record says
This Act is the Incorporated Societies Act . comes into force on the day after the date of Royal assent. The rest of this Act comes into force on a date or dates to be appointed by the Governor-General by Order in Council, and 1 or more Orders in Council may be made appointing different dates for different provisions and for different purposes. However,— to and any item, or any part of an item, in that has not earlier been brought into force comes into force on the fourth anniversary of the date of Royal assent; and any other provision to which applies that has not earlier been brought into force comes into force on the expiry of the 18-month period that starts on the date of Royal assent. An Order in Council made under this section is secondary legislation ( Part 3 of the Legislation Act