Technical Specifications & Standards
Official chronometric properties, ISO standards, and international database registry identifiers for Indian Ocean Time:
Daylight Saving Time (DST) Transitions
⬆️ Spring Forward (Clocks Advance)
None
⬇️ Fall Back (Clocks Return)
None
Observing Jurisdictions & Subdivisions
1 Sovereign NationsSovereign nations, administrative subdivisions, and regional territories officially operating under IOT:
Regional Subdivisions & Territory Details
Financial Markets & Trading Hours
Oversees joint UK-US naval support facility logistics, satellite tracking, and trans-oceanic military communications.
Local Hours: 08:00 - 17:00 IOT
UTC Window: 02:00 - 11:00 UTC
Major Cities in IOT
Primary metropolitan centers and financial hubs observing this time zone:
Adoption History & Astronomical Facts
Year Established: 1965
Established when the British Indian Ocean Territory was organized in 1965, setting civil and defense timetables on UTC+6 to reflect the Chagos Archipelago's longitude at 72° East.
Diego Garcia is an equatorial coral atoll enclosing a 21-kilometer lagoon that serves as a deep-water anchorage and strategic logistics node in the central Indian Ocean.
Frequently Asked Questions about IOT
What is Indian Ocean Time?
Indian Ocean Time (IOT) is UTC+6, observed in the British Indian Ocean Territory across the Chagos Archipelago.
Does Diego Garcia observe Daylight Saving Time?
No. Diego Garcia stays on UTC+6 all year.
What is the time difference between London and Diego Garcia?
Diego Garcia is 6 hours ahead of London in winter (GMT) and 5 hours ahead in summer (BST).