(1) Where an Act of the Oireachtas or any particular enactment contained in any such Act is expressed to come into operation on a day subsequent to the date of the passing of such Act, the following provisions shall have effect, that is to say: -
(a) if the day on which such Act or such enactment (as the case may be) comes into operation is to be fixed or ascertained in any particular manner, the instrument, act, or thing whereby such day is fixed or ascertained may, subject to any restrictions imposed by such Act, be made or done at any time after the passing of such Act;
(b) if such Act confers a power to make or do, for the purposes of such Act or such enactment (as the case may be), any instrument, act, or thing the making or doing of which is necessary or expedient to enable such Act or enactment to have full force and effect immediately upon its coming into operation, such power may, subject to any restrictions imposed by such Act, be exercised at any time after the passing