The COVID-19 outbreak in Auckland has forced the suspension of political campaigning and prompted calls to postpone the general election.
The election will now be held on 17 October.
It follows calls from coalition partner New Zealand First and both opposition partners to delay the election because of the effects COVID-19 restrictions would have on electioneering.
Jacinda Ardern said she would not change the election date again.
If a further outbreak followed: "My view is we will be sticking with the date we have," she said.
