Thursday 1 Jan New Year's Day:
Friday 2 Jan New Year's Day Holiday:
Friday 6 Feb Waitangi Day:
Friday 10 Apr Good Friday:
Monday 13 Apr Easter Monday:
Saturday 25 Apr ANZAC Day:
Monday 1 Jun Queens Birthday:
Monday 26 Oct Labour Day:
Friday 25 Dec Christmas Day:
Monday 28 Dec Boxing Day:
Source: http://www.nzx.com/markets/key_dates/trading_hours