Chatham Daylight Time

Frequently asked questions

Common questions about CHADT, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].

Why is Chatham's time zone 45 minutes ahead of New Zealand's?

The Chatham Islands' geographical position far east of mainland New Zealand led to a compromise time zone that aligns more closely with their actual solar time, resulting in the unusual UTC+12:45 offset.

Is Chatham Daylight Time used in mainland New Zealand?

No, not at all. Only the Chatham Islands observe this offset—everywhere else in New Zealand uses New Zealand Standard Time or NZDT during summer months.

How do people schedule meetings between Chatham Islands and Auckland?

Because Chatham is 45 minutes ahead, coordinating across these zones requires extra attention to detail—a meeting at noon in Auckland would already be 12:45 in the Chathams.

Does daylight saving affect the Chatham Islands differently than mainland?

Yes—while both regions spring forward during DST, Chatham moves to UTC+13:30 instead of NZ’s usual +13:00, creating a full hour and fifteen minute gap between Chathams and mainland.

Are there any other places on Earth with a 45-minute offset?

Almost none—Chatham is joined only by Nepal (UTC+5:45), making these two countries among the very few using non-standard quarter-hour offsets globally.

What’s life like in terms of sunrise and sunset for residents?

Because the Chathams are so far east and use this unique time zone, sunrises and sunsets occur earlier than on the mainland, giving residents a distinctive start and end to each day.

How do businesses in the Chatham Islands handle national or international time coordination?

Most communicate using clear reference points—often double-checking times with mainland partners to avoid confusion caused by the unusual offset or daylight saving transitions.

Do digital clocks or devices usually show this time zone correctly?

Not always; some systems default to NZST unless specifically set for Pacific/Chatham—the islands’ small population means errors occasionally slip through automated updates.

What happens if you travel from Auckland to the Chatham Islands?

You'll adjust your watch forward by 45 minutes—a small but noticeable shift that highlights just how unique this archipelago's place in global timekeeping truly is.