The actor discussed what he has learned from his relationship with the singer on a podcast hosted by Jay Shetty
"Ultimately, the 17th of October ... provides sufficient time for parties to plan around the range of circumstances we will be campaigning under," Ardern said at a news conference.
"We are all in the same boat. We are all campaigning in the same environment," Ardern said.
New Zealand on Monday recorded nine new cases of Covid-19, taking the number of active cases to 78. There have now been a total of 1,280 cases in the country, and 22 deaths.
The election was scheduled for September 19 and New Zealand law requires it to be held by November 21. Advance voting will now start on October 3.
Deputy Prime Minister Winston Peters, who had called for a delay, said "common sense has prevailed".
The leader of the populist New Zealand First party delivered government to Labour through a coalition deal after no party won a majority at the 2017 election.
BORDER FAILURE?
Her rivals are hoping Ardern loses some of her appeal once economic hardships caused by the lockdown begin to bite.
New Zealand has fared far better than most countries during the pandemic but an abrupt resurgence of Covid-19 last week in Auckland prompted Ardern to extend a lockdown for the city's 1.7 million residents until August 26, while social distancing rules are in place in other towns and cities.
The origin of the new outbreak is still unknown. Authorities said previously that it could have been through an Americold cold-storage facility where one of the infected individuals worked.
Tests of surfaces in the facility are under way to identify the genome sequence. Australian authorities are also investigating if there is any link to an Americold facility in the Australian city of Melbourne, where COVID-19 cases have surged in recent weeks.
"Right now the focus must be on finding out exactly what failed so catastrophically at the border so we can be sure it won't happen again," National Party leader Judith Collins said on Twitter.
New Zealanders celebrated when authorities eliminated community transmission of the coronavirus at the start of the pandemic with a hard lockdown that forced almost everyone to stay at home.
The government extended a wage subsidy scheme and mortgage deferral programme to support businesses and jobs affected by the lockdown.
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