Time zone · Oceania
CHAST
Chatham Standard Time
Chatham Standard Time (CHAST) covers a single zone in New Zealand—Pacific/Chatham—which follows a unique UTC+12:45 standard offset. During DST, clocks shift forward to +13:45, making it one of the only regions in the world with a non-standard quarter-hour offset and daylight saving.
Saturday, June 6, 2026
Current offset
UTC+12:45
Standard · +1245
Daylight saving
Not active
Returns 27 Sept 2026
IANA zones
1
1 observe DST, 0 don't
DST offset
UTC+13:45
CHADT · +1h
About CHAST
Standard time, with a summer shift.
Chatham Standard Time (CHAST) covers a single zone in New Zealand—Pacific/Chatham—which follows a unique UTC+12:45 standard offset. During DST, clocks shift forward to +13:45, making it one of the only regions in the world with a non-standard quarter-hour offset and daylight saving.
DST schedule · CHAST · CHADT
2026 Sunday · clocks spring forward
Clocks spring forward by one hour · in 4 months.
One year, two clocks
IANA zones · the technical identifiers
The zone that resolve to CHAST.
For software, always store the IANA identifier — never the abbreviation alone. The database keeps these zones distinct because their rules can, and historically did, diverge.
Where CHAST is used
One country.
Frequently asked questions
Common questions about CHAST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Why does the Chatham Islands use a +12:45 offset?
- The Chatham Islands are geographically located 45 minutes ahead of New Zealand's main time zone, resulting in the distinctive UTC+12:45 standard offset.
- Is the Chatham Islands the only place with a 45-minute offset?
- Yes, for practical purposes the Chatham Islands are the only inhabited region using a standard 45-minute offset from UTC, making CHAST truly unique.
- Does CHAST observe daylight saving time?
- Yes, CHAST observes DST, shifting forward by one hour during the New Zealand summer, resulting in a +13:45 offset during that period.
- When does DST start and end in CHAST?
- In the Chatham Islands, DST starts on the last Sunday of September at 03:45 and ends on the first Sunday of April at 02:45 (local time).
- How does living on CHAST affect daily life?
- Residents experience some of the earliest sunrises and sunsets globally, and the unusual offset requires extra attention when scheduling with the mainland or international partners.
- What abbreviation is used for CHAST?
- CHAST stands for Chatham Standard Time and is commonly abbreviated as +1245 in technical contexts.
- Which country governs the Chatham Islands' time zone?
- The Chatham Islands are part of New Zealand, and their time zone is officially managed by the New Zealand government.
- Is CHAST the same as New Zealand Standard Time?
- No, New Zealand Standard Time (NZST) is UTC+12, while CHAST is +12:45, making the Chatham Islands 45 minutes ahead of mainland New Zealand.
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