UTC
Coordinated Universal Time
UTC+0 — No daylight saving time
Abbreviation
UTC
UTC Offset
UTC+0
Full Name
Coordinated Universal Time
DST
No
About UTC — Coordinated Universal Time
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is maintained by a network of over 400 atomic clocks in 70 national laboratories worldwide, coordinated by the International Bureau of Weights and Measures (BIPM). UTC replaced Greenwich Mean Time (GMT) as the world standard in 1972 and serves as the reference point from which all other time zones are calculated. UTC+0 is observed as a local time in Iceland, Ghana, and several West African nations, and is used universally in aviation, maritime navigation, computing, and international broadcasting.
Countries Using UTC
- Used worldwide as the international time standard
Major Cities in UTC
Conversion Examples for UTC
| UTC Time | UTC (UTC+0) |
|---|---|
| 00:00 UTC | 00:00 UTC |
| 06:00 UTC | 06:00 UTC |
| 09:00 UTC | 09:00 UTC |
| 12:00 UTC | 12:00 UTC |
| 15:00 UTC | 15:00 UTC |
| 18:00 UTC | 18:00 UTC |
| 21:00 UTC | 21:00 UTC |
Related Time Zones
Tools
About UTC (UTC)
UTC (UTC+0) is a standard time zone designation used by Used worldwide as the international time standard. Time zone abbreviations like UTC refer to a specific UTC offset rather than a geographic region — multiple time zones around the world may share the same offset while using different local names.
When scheduling internationally, it is more reliable to refer to a city name or IANA time zone identifier (like America/New_York or Asia/Dubai) than to a short abbreviation, since abbreviations are not globally standardised and can be ambiguous — for example, CST refers to both Central Standard Time (UTC−6) in North America and China Standard Time (UTC+8).
Use the conversion table on this page to see what any UTC hour maps to in UTC, and use the tools below to convert between UTC and any other time zone or city in real time.
UTC Offset vs IANA Time Zone: What's the Difference?
UTC Offset
A UTC offset like UTC+4 or UTC−5 is a simple number expressing how many hours and minutes a location is ahead of or behind Coordinated Universal Time. It is fixed and does not carry any information about DST rules or transitions.
IANA Time Zone
An IANA identifier like Europe/London or Asia/Tokyo is a database entry that includes the full history of UTC offset changes, DST rules, and historical exceptions for that location. IANA identifiers should always be preferred in software and scheduling systems.
Convert UTC Time
UTC — Frequently Asked Questions
UTC (Coordinated Universal Time) is the world's primary time standard, maintained by atomic clocks and used as the reference point for all other time zones. It replaced GMT as the international standard in 1972.
UTC and GMT are both UTC+0, but they differ technically. UTC is maintained by atomic clocks and is the international civil standard. GMT is a time zone based on solar time at the Greenwich meridian. For practical purposes of telling the time, they are identical.
Iceland (year-round), Ghana, Ivory Coast, Senegal, Guinea, Togo, Burkina Faso, Mali, Sierra Leone, and several other West African countries use UTC+0 as their permanent local time.
UTC provides a single unambiguous reference time that eliminates confusion caused by different time zones and daylight saving schedules. Aviation uses UTC (called Zulu time) for flight plans and communications. Computing systems log events in UTC to allow accurate cross-timezone comparison.