Some councils are testing tsunami warning systems as daylight saving starts.
Christchurch's tsunami warning siren system will be tested at 11am on Sunday with the 45 sirens sounding for up to three minutes.
Each year Christchurch City Council tests the coastal siren network on the Sundays that Daylight Saving begins and ends.
The sirens will only be heard within a few blocks of the beach.
Napier City Council is testing its emergency sirens for about five minutes from noon on Sunday.
The council is asking residents to respond to a survey about the test so it can identify any blackspots.
A siren was installed in Ahuriri last year following feedback from that community.
The council holds two siren tests each year, the other being a weekday, midday test, usually in April when daylight saving ends.
New Zealand daylight saving begins when clocks go forward an hour at 2am on Sunday to become 3am.
The extra hour of daylight in the evenings will run until April 3, 2016, when clocks go back an hour at 3am to 2am.
The change to daylight saving is also a good time for residents to check their household emergency plans, survival kits and home smoke alarms.