Prime Minister Jacinda Ardern has confirmed the General Election will be held on 17 October.

“The Electoral Commission, via the Ministry of Justice, has advised me that a safe and accessible election is achievable on this date. This short delay gives the Commission more time to prepare including freeing up facilities for early voting during school holidays,” Jacinda Ardern said. ...

https://www.beehive.govt.nz/release/election-be-held-17-october

See also

New Zealand Electoral Commission