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A Christchurch City Council spokeswoman said the afternoon service will honour those killed and build on the spirit of unity that came out of the tragedy.
Fifty-one people died as a result of the shootings at the Al Noor and Linwood mosques, and many more were injured.
The national remembrance service will be held at North Hagley Park.
The programme for the service is being put together with input from the people most affected by the attacks, including survivors and the families of the victims.
The service will be jointly led by the local Muslim community, city council, the Government and Ngāi Tūāhuriri as mana whenua.
More details - including the service start time - will be announced in the coming weeks.