For the purposes of this Act, a period expressed in months and dating from an event ends:
(a) on the day, in the relevant subsequent month, which has the same number as the day of the event; or
(b) if the relevant subsequent month has no day with the same number--on the last day of the month.
Note: For example, a period of 3 months from an event on 30 September ends on 30 December under this rule.