(1) An Amending agreement commences—
(a) when the notice of making of the Amending agreement is published in the Government Gazette under section 18; or
(b) if a later day is specified in the Amending agreement, on that later day.
(2) A variation commences—
(a) when the notice of making of the variation is published in the Government Gazette under section 18; or
(b) if a later day is specified in the variation statement, on that later day.