Time zone
CHADT
Chatham Daylight Time
Chatham Daylight Time (CHADT) follows the unique UTC+12:45 offset used by New Zealand’s Chatham Islands—one of the few time zones worldwide with a 45-minute increment. While clocks may feel familiar to mainland New Zealanders, local schedules and connections shift when daylight saving ends, so global collaborators should double-check timing between late September and early April.
Thursday, June 18, 2026
Current offset
UTC+12:45
Standard · +1245
Daylight saving
Not observed
Year-round standard time
IANA zones
0
None observe daylight saving
DST offset
—
No summer variant
About CHADT
A fixed, year-round offset.
Chatham Daylight Time (CHADT) follows the unique UTC+12:45 offset used by New Zealand’s Chatham Islands—one of the few time zones worldwide with a 45-minute increment. While clocks may feel familiar to mainland New Zealanders, local schedules and connections shift when daylight saving ends, so global collaborators should double-check timing between late September and early April.
Convert
CHADT to the world's clocks.
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 does Chatham use a 45‑minute offset instead of a full hour?
- The Chatham Islands lie far east of mainland New Zealand, geographically closer to UTC+13:00 than UTC+12:00. To better match sunrise and sunset times, the standard offset was set at UTC+12:45—making it one of the rare time zones with a quarter‑hour difference from UTC.
- Is CHADT used anywhere besides the Chatham Islands?
- No. CHADT applies only to the Pacific/Chatham time zone, which covers the Chatham Islands archipelago. No other regions or countries legally observe this exact offset.
- When does CHADT switch to/from standard time?
- Daylight saving ends on the last Sunday in September at 03:45 local time (+1245), when clocks move back to UTC+13:45. It resumes on the first Sunday in April at 02:45 (+1345), shifting forward to UTC+12:45 again.
- How should I schedule meetings with someone on Chatham Island?
- Always confirm the date with your contact or use a trustworthy world clock. Rules are simple but easy to miss: from April to September they’re on UTC+12:45; for the rest of the year they shift to UTC+13:45.
- What happens during the ‘gap’ around the time change?
- Because clocks move backward by one hour, times between 03:45 and 02:45 (the following day) repeat itself. Some digital systems skip or duplicate events, so critical tasks like flights or deadlines are usually anchored to UTC.
- Does CHADT follow mainland New Zealand’s daylight saving rules?
- Conceptually yes—same spring-forward, fall-back pattern—but with a 45-minute twist. Instead of shifting between UTC+12 and +13, CHADT switches between +12:45 and +13:45.
- Do devices automatically update for CHADT?
- Most modern devices handle it correctly viatz database updates, but older systems or custom calendars may still show the wrong offset. Manually verify annually if precision matters.
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