IANAL, but given this case is in an ACT court the ACT’s Legislation Act 2001 [0] (perhaps better named than ‘Acts Interpretation Act 1901’) is probably the more relevant piece of legislation in this case, and defines a ‘month’ like this:

  "month" means a period beginning at the start of any day of one of the calendar months and ending—

  (a) immediately before the start of the corresponding day of the next calendar month; or

  (b) if there is no such corresponding day—at the end of the next calendar month.

  Examples

  1 The period beginning at the start of 8 May 2014 and ending at midnight on 7 June 2014 is a month.

  2 The period beginning at the start of 30 January 2014 and ending at midnight on 28 February 2014 is a month. The month ends on the last day of February because in that year, February does not have a day corresponding to 29 January (because 2014 is not a leap year). If the period began at the start of 30 January 2016 (ie a leap year), the month would end at midnight on 29 February 2016.

  Note: An example is part of the Act, is not exhaustive and may extend, but does not limit, the meaning of the provision in which it appears (see Legislation Act, s 126 and s 132).

Example 2 is extremely relevant.

[0] http://www.austlii.edu.au/cgi-bin/viewdoc/au/legis/act/conso...