Jacinda Ardern's resignation from Parliament will come in to effect from 15 April.
On the first sitting of Parliament for the year, Speaker Adrian Rurawhe noted he had received Ardern's letter of resignation for her seat in the House.
It will come into effect 11.59pm on 15 April.
The Mt Albert MP stunned New Zealanders last month when she announced she would step down as prime minister.
She indicated then she would delay her departure from Parliament to avoid the need for a by-election in her electorate.
Parliament can choose not to hold a by-election if an electorate MP resigns within six months of a general election.