What the official record says
This Act is the Canterbury Earthquake Commemoration Day Act . This Act comes into force on the day after the date on which it receives the Royal assent. The purpose of this Act is to provide for— a day of commemoration in respect of the devastating consequences of the Canterbury earthquake and, in particular, the aftershock on 22 February 2011 at 12.51 pm; and the commemoration day to be observed as a public holiday in those parts of Canterbury that observe Christchurch Show Day as Canterbury Anniversary Day in accordance with the Holidays Act 2003. In this Act, unless the context otherwise requires,— has the meaning given by section 4(1) of the Canterbury Earthquake Response and Recovery Act 2010 means the day— observed in northern and central Canterbury as Canterbury Anniversary Day in a