§5 — Coming into operation of enactments

[(1) Where any Central Act is not expressed to come into operation on a particular day, then it shall come into operation on the day on which it receives the assent,— (a) in the case of a Central Act made before the commencement of the Constitution, of the Governor-General, and (b) in the case of an Act of Parliament, of the President.] * * * * * (3) Unless the contrary is expressed, a [Central Act] or Regulation shall be construed as coming into operation immediately on the expiration of the day preceding its commencement.