The Islamic Call to Prayer will be broadcast on radio stations around the country to mark the anniversary of the Christchurch mosque attacks.
It has been three years since 51 people lost their lives at the Al Noor Mosque and Linwood Islamic Centre.
The Christchurch City Council says it is one of the city's "darkest days".
"To everyone who was affected through loss, injury and grief, you are forever in our thoughts," a spokesperson said.
There are a number of radio stations that will be broadcasting the Islamic Call to Prayer (Adhan) at 1.39pm - one of the five call to prayer times for March 15.