Technical Specifications & Standards
Official chronometric properties, ISO standards, and international database registry identifiers for Coordinated Universal Time:
Daylight Saving Time (DST) Transitions
⬆️ Spring Forward (Clocks Advance)
None (UTC never shifts for daylight saving)
⬇️ Fall Back (Clocks Return)
None
Observing Jurisdictions & Subdivisions
4 Sovereign NationsSovereign nations, administrative subdivisions, and regional territories officially operating under UTC:
Regional Subdivisions & Territory Details
Financial Markets & Trading Hours
Used as the benchmark time by air traffic controllers, weather satellites, database server logs, and the SWIFT interbank messaging network.
Local Hours: Sunday 22:00 UTC - Friday 22:00 UTC
UTC Window: Universal Zero Offset Baseline
Local Hours: 24/7/365 Continuous
UTC Window: Universal Zero Offset Baseline
Major Cities in UTC
Primary metropolitan centers and financial hubs observing this time zone:
Adoption History & Astronomical Facts
Year Established: 1960
Formalized in 1960 by the International Radio Consultative Committee. The time is calculated by the International Bureau of Weights and Measures (BIPM) in Sèvres, France, using weighted averages from over 400 cesium atomic clocks located in national metrology laboratories worldwide.
The acronym 'UTC' was deliberately chosen as an international compromise. English speakers pushed for 'CUT' (Coordinated Universal Time) and French speakers insisted on 'TUC' (Temps Universel Coordonné). The International Telecommunication Union settled on 'UTC' so that neither language received preference.
Frequently Asked Questions about UTC
What does UTC stand for?
UTC stands for Coordinated Universal Time. It is the primary atomic time standard used to synchronize clocks around the globe.
What is the difference between UTC and GMT?
UTC is an atomic time scale kept by high-precision atomic clocks, whereas GMT is a historical astronomical time zone tied to the Earth's rotation at Greenwich. For standard civil clocks, both show the exact same hour and minute.
Does UTC observe daylight saving time?
No. UTC never shifts for daylight saving time; it remains uniform throughout the year.