Technical Specifications & Standards
Official chronometric properties, ISO standards, and international database registry identifiers for Bhutan Time:
Daylight Saving Time (DST) Transitions
⬆️ Spring Forward (Clocks Advance)
None (High mountain valleys maintain stable solar day cycles without seasonal clock shifts)
⬇️ Fall Back (Clocks Return)
None
Observing Jurisdictions & Subdivisions
1 Sovereign NationsSovereign nations, administrative subdivisions, and regional territories officially operating under BTT:
Regional Subdivisions & Territory Details
Financial Markets & Trading Hours
Thimphu hydro-generation and banking desks coordinate energy exports directly with transmission grids across eastern India and Bangladesh.
Local Hours: 09:00 - 15:00 BTT
UTC Window: 03:00 - 11:00 UTC
Major Cities in BTT
Primary metropolitan centers and financial hubs observing this time zone:
Adoption History & Astronomical Facts
Year Established: 1987
Standardized by royal government decree in 1987 on the 90th meridian east, aligning the Buddhist kingdom with the natural solar zenith over the central valleys.
Crossing the ornate border gate between the Indian town of Jaigaon (IST, UTC+5:30) and the Bhutanese commercial hub of Phuntsholing (BTT, UTC+6) advances your watch by exactly thirty minutes.
Frequently Asked Questions about BTT
What is the time difference between Bhutan and India?
Bhutan is 30 minutes ahead of India. When it is 12:00 noon in New Delhi or Kolkata (IST, UTC+5:30), it is 12:30 PM in Thimphu (BTT, UTC+6).
Does Bhutan share its time zone with Bangladesh?
Yes. Bhutan and Bangladesh both operate on UTC+6 throughout the entire year, sharing the exact same clock time.
Does Bhutan observe Daylight Saving Time?
No. Bhutan remains on Bhutan Time (UTC+6) every day of the year without daylight saving changes.