Technical Specifications & Standards
Official chronometric properties, ISO standards, and international database registry identifiers for Cook Islands Time:
Daylight Saving Time (DST) Transitions
⬆️ Spring Forward (Clocks Advance)
None (Discontinued in 1991)
⬇️ Fall Back (Clocks Return)
None
Observing Jurisdictions & Subdivisions
1 Sovereign NationsSovereign nations, administrative subdivisions, and regional territories officially operating under CKT:
Regional Subdivisions & Territory Details
Financial Markets & Trading Hours
Facilitates international offshore trust administration, pearl exports, and tourism in free association with New Zealand.
Local Hours: 09:00 - 15:00 CKT
UTC Window: 19:00 - 01:00 UTC
Major Cities in CKT
Primary metropolitan centers and financial hubs observing this time zone:
Adoption History & Astronomical Facts
Year Established: 1978
The Cook Islands observed UTC-10:30 before moving to UTC-10 on May 5, 1978. Daylight saving was observed briefly between 1978 and 1991 before being discontinued.
Although the Cook Islands is in free association with New Zealand, Rarotonga (UTC-10) is 22 hours behind Wellington (UTC+12) during winter, sitting across the date line.
Frequently Asked Questions about CKT
What is Cook Islands Time?
Cook Islands Time (CKT) is UTC-10, observed across all 15 islands of the Cook Islands.
What is the time difference between the Cook Islands and New Zealand?
The Cook Islands are 22 hours behind New Zealand in winter and 23 hours behind in summer.
Does the Cook Islands observe daylight saving?
No. The Cook Islands discontinued daylight saving in 1991.