Monday 02 Jan New Year's Day OBS
Tuesday 03 Jan New Year's Day OBS
Monday 06 Feb Waitangi Day
Thursday 05 Apr Abbreviated Trading
Friday 06 Apr Good Friday
Monday 09 Apr Easter Monday
Wednesday 25 Apr ANZAC Day
Monday 04 Jun Queens Birthday
Monday 22 Oct Labour Day
Tuesday 25 Dec Christmas Day
Wednesday 26 Dec Boxing Day
Source: https://www.nzx.com/markets/NZSX/trading_hours