CHADT — Chatham Island Daylight Time
See what CHADT means, where it is used, how DST affects it, and compare or convert Chatham Islands time with other zones.
How to Convert CHADT to Other Time Zones
Open the CHADT converter page: Go to https://www.xconvert.com/time-converter/chadt-time-zone to load the visual comparison grid with Chatham Island Daylight Time already shown. This page is useful when you need to line up a call, shipment update, or travel connection involving New Zealand’s Chatham Islands, which run on one of the world’s most unusual daylight offsets at UTC+13:45.
Add comparison cities with the “+ Add City” button: Click + Add City and search for places such as Auckland, Wellington, and Sydney if you are comparing mainland New Zealand operations with Chatham Islands schedules, or add London and New York for international client coordination. This is especially helpful for aviation, government services, fisheries logistics, and remote teams that need to see how Chatham’s 45-minute offset difference from standard hourly zones affects meeting windows.
Drag on the grid to select a working time range: Click Select if needed, then drag across the CHADT row to highlight a block such as 9:00 AM to 11:00 AM CHADT; the purple selection will instantly show the matching local times in every added city. For example, 9:00 AM CHADT is 8:15 AM in Auckland during NZDT, and that same quarter-hour difference matters when confirming whether a morning operations check-in from the Chatham Islands still fits mainland New Zealand office hours.
Export or share the selected time: After selecting the range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. That makes it easy to send a precise meeting slot to a distributed team, add a charter flight coordination window to calendars, or share a link so everyone sees the same CHADT-based time block in their own local zone automatically.
About Chatham Island Daylight Time (CHADT)
CHADT stands for Chatham Island Daylight Time, the daylight saving time observed in the Chatham Islands, a remote part of New Zealand located in the South Pacific southeast of the main islands. Its exact offset is UTC+13:45, which means local time is 13 hours and 45 minutes ahead of Coordinated Universal Time. That quarter-hour offset makes CHADT unusual, because most world time zones differ from UTC by whole hours or half hours rather than 45 minutes.
CHADT is used specifically in the Chatham Islands region, including the settlement of Waitangi, Chatham Island, during the daylight saving season. The islands have a small population of roughly 600 people, and despite their remote location, accurate time conversion matters for transport links, public administration, weather services, fishing activity, and communications with mainland New Zealand, which uses NZDT (UTC+13:00) during its own daylight saving period.
Compared with UTC, CHADT is straightforward mathematically but easy to misread because of the :45 offset. If it is 12:00 noon UTC, it is 1:45 AM the next day in CHADT. CHADT is also 45 minutes ahead of mainland New Zealand daylight time, so when it is 9:00 AM in Auckland during NZDT, it is 9:45 AM in the Chatham Islands.
CHADT and Daylight Saving Time
CHADT is the daylight saving time used in the Chatham Islands, and outside the DST season the region switches to CHAST — Chatham Island Standard Time, which is UTC+12:45. The daylight shift adds one hour, moving the islands from UTC+12:45 to UTC+13:45 for the warmer part of the year.
For the current year, 2026, the Chatham Islands observe daylight saving on a schedule tied to New Zealand’s seasonal clock changes but adjusted to local Chatham time. CHADT began on Sunday, 28 September 2025, at 2:45 AM CHAST, when clocks moved forward to 3:45 AM CHADT. It ends on Sunday, 5 April 2026, at 3:45 AM CHADT, when clocks move back to 2:45 AM CHAST.
This timing matters for scheduling because the offset changes from UTC+13:45 in summer to UTC+12:45 in winter. If you are planning travel, shipping, or a recurring meeting, a slot that works in January may be one hour different in May, even though the location is the same. For organizations coordinating with Wellington, Christchurch, or Auckland, the Chatham Islands remain 45 minutes ahead of mainland New Zealand both in standard time and daylight time.
Frequently Asked Questions
What does CHADT stand for?
CHADT stands for Chatham Island Daylight Time. It is the daylight saving time used in the Chatham Islands of New Zealand during the summer season, and its official UTC offset is UTC+13:45.
Is CHADT the same as GMT?
No, CHADT is not the same as GMT. GMT is effectively UTC+0, while CHADT is UTC+13:45, so CHADT is 13 hours and 45 minutes ahead of GMT; when it is 9:00 AM GMT, it is 10:45 PM CHADT on the same calendar day.
Which cities use CHADT?
CHADT is used in the Chatham Islands, not across a large list of major global cities. The principal settlement typically referenced is Waitangi, Chatham Island, and the time zone applies to the wider Chatham Islands region during daylight saving months.
What is the UTC offset for CHADT?
The exact UTC offset for CHADT is +13:45. That means you add 13 hours and 45 minutes to UTC to get local Chatham Islands daylight time, so 6:00 PM UTC becomes 7:45 AM CHADT the next day.
When does CHADT change?
CHADT changes when the Chatham Islands leave daylight saving time and return to CHAST (UTC+12:45). In 2026, the switch back happens on Sunday, 5 April 2026, when clocks move from 3:45 AM CHADT back to 2:45 AM CHAST; the most recent switch into CHADT occurred on Sunday, 28 September 2025.
Is CHADT the same as New Zealand time?
Not exactly. During daylight saving, mainland New Zealand uses NZDT (UTC+13:00), while the Chatham Islands use CHADT (UTC+13:45), so the Chatham Islands are 45 minutes ahead; when it is 8:00 AM in Wellington, it is 8:45 AM in the Chatham Islands.
Why does CHADT have a 45-minute offset?
CHADT follows the long-established local time system used in the Chatham Islands, which is based on a 45-minute difference rather than a full hour from mainland New Zealand. This unusual offset reflects the islands’ separate regional timekeeping practice and is maintained consistently in both standard time (CHAST, UTC+12:45) and daylight time (CHADT, UTC+13:45).