New Zealand uses New Zealand Standard Time (NZST), UTC+12, for its main islands. In summer (September to April, southern hemisphere), it advances to New Zealand Daylight Time (NZDT), UTC+13.
The Chatham Islands, a small archipelago about 800 kilometers east of the main islands, use their own timezone: UTC+12:45 in winter, UTC+13:45 in summer. The Chatham Islands are one of the very few places on Earth with a 45-minute offset from the hour.
This makes New Zealand home to two timezone identifiers: Pacific/Auckland and Pacific/Chatham.
Why UTC+12:45 for the Chathams?
The Chatham Islands sit at about 176 degrees West longitude. The International Date Line, which theoretically runs at 180 degrees, bends around the Chathams so they stay in the same calendar day as New Zealand. But their geographic position, further east than mainland New Zealand’s 174 degrees East, means they’re slightly further ahead in solar time.
UTC+12:45 is a 45-minute offset ahead of mainland New Zealand Standard Time. The reasoning follows the same logic as Nepal’s UTC+5:45: a 30-minute offset would be close but not quite right; the hour would be too much. The compromise is 45 minutes.
The IANA identifier Pacific/Chatham exists specifically because no other timezone has these rules. The Chatham Islands have their own entry in the database because they need it.
One of the first to see the new day
New Zealand at UTC+12 (UTC+13 in summer) is consistently among the first inhabited places on Earth to greet each new year. Auckland, Wellington, and Christchurch see the new year’s fireworks before almost everyone else on the planet, and these celebrations are often broadcast internationally as a preview of what’s coming.
At UTC+13 in summer, New Zealand is 13 hours ahead of London in winter (when the UK is at UTC+0). When it is noon on December 31 in London, it is already 1am on January 1 in Auckland. New Zealand is literally in tomorrow.
The Māori calendar
The Māori people, who arrived in New Zealand approximately 700 to 1000 years ago from eastern Polynesia, organized time around Maramataka: the Māori lunar calendar. Maramataka literally means “the turning of the moon” and was a sophisticated system for tracking agricultural, fishing, and planting activities based on lunar phases and star positions.
The Pleiades star cluster (Matariki in Māori) was particularly important: its predawn appearance in late May or June marked the Māori New Year, a time for remembrance of those who had died and for planting and preparation. Matariki has been revived as a public holiday in New Zealand since 2022, the first time an indigenous calendar event has become a national public holiday in the country.
The date of Matariki changes each year, following the lunar-stellar calendar rather than the Gregorian calendar. This means New Zealand has both fixed-date public holidays (Waitangi Day, Anzac Day) and one variable-date holiday determined by indigenous astronomical observation. The IANA database records the fixed UTC+12/+13 offset; Matariki moves within it according to Māori reckoning.
The Chatham Islands: a different world
The Chatham Islands have about 600 permanent residents. They are remote enough that the New Zealand government considers them a distinct administrative area. The islands are home to the Moriori people, the original inhabitants who arrived before the Māori, and who suffered near-genocide when Māori invaders arrived from mainland New Zealand in 1835.
The Moriori had developed a pacific culture (the Nunuku’s Law forbade warfare) that proved catastrophically unsuited to violent invasion. Their population was reduced from perhaps 2,000 to 101 by 1870. The Moriori revival and recognition of their distinct identity has been an ongoing process in New Zealand’s broader Treaty of Waitangi reconciliation framework.
A community of 600 people on islands that are 45 minutes ahead of mainland New Zealand and 45 minutes further ahead than that in summer. UTC+13:45 at the peak. An extreme edge of the calendar.
Hobbiton and movie time
Peter Jackson’s Lord of the Rings trilogy (2001-2003) and The Hobbit trilogy (2012-2014), filmed in New Zealand, created a global association between New Zealand’s landscape and the fictional world of Middle-earth. The Hobbiton set near Matamata on the North Island has become a permanent tourist attraction.
The films operated on local New Zealand time. The production company, Weta Workshop, is based in Wellington. International partners in the United States and UK coordinated on the 12-13 hour offset, with New Zealand a full day ahead of Los Angeles for much of the year. Conference calls between Wellington and Los Angeles require bridging that gap: when it’s Monday afternoon in Wellington, it’s Sunday afternoon in Los Angeles.
