Technical Specifications & Standards
Official chronometric properties, ISO standards, and international database registry identifiers for Chatham Island Daylight Time:
Daylight Saving Time (DST) Transitions
⬆️ Spring Forward (Clocks Advance)
Clocks advance from CHAST on the last Sunday in September at 02:45
⬇️ Fall Back (Clocks Return)
Clocks return to CHAST on the first Sunday in April at 03:45
Observing Jurisdictions & Subdivisions
1 Sovereign NationsSovereign nations, administrative subdivisions, and regional territories officially operating under CHADT:
Regional Subdivisions & Territory Details
Financial Markets & Trading Hours
Summer seafood processing and conservation monitoring in the southwestern Pacific Ocean.
Local Hours: 08:30 - 16:30 CHADT
UTC Window: 18:45 - 02:45 UTC
Major Cities in CHADT
Primary metropolitan centers and financial hubs observing this time zone:
Adoption History & Astronomical Facts
Year Established: 1974
Adopted alongside New Zealand's national daylight saving legislation in 1974, shifting the islands to UTC+13:45 during the southern hemisphere summer.
During daylight saving time, the Chatham Islands observe UTC+13:45, making them one of the first inhabited places on Earth to welcome each new dawn.
Frequently Asked Questions about CHADT
What is CHADT?
CHADT stands for Chatham Island Daylight Time (UTC+13:45).
When is CHADT observed?
From the last Sunday in September to the first Sunday in April.
What is the standard time counterpart to CHADT?
Chatham Island Standard Time (CHAST, UTC+12:45) is the winter counterpart.