What is UTC?
UTC is the global time standard that timestamps and servers use, with no daylight saving. Learn UTC vs GMT and convert a timestamp free.
UTC (Coordinated Universal Time) is the primary time standard the world sets clocks by. Servers, logs, and Unix timestamps use UTC because it is unambiguous — it never shifts for daylight saving and does not depend on where you are.
Why systems use UTC
If every server stored time in its local zone, comparing events across regions would be a nightmare of offsets and daylight-saving jumps. Storing everything in UTC gives one consistent timeline; you only convert to a local zone when displaying a time to a person.
UTC vs GMT
In casual use UTC and GMT refer to the same clock time. Technically UTC is a precise standard kept by atomic clocks (with occasional leap seconds), while GMT is a timezone. For engineering, always think in UTC.
Offsets and daylight saving
Local times are written as UTC plus or minus an offset (e.g. UTC-5). Daylight saving changes that offset seasonally — another reason to store the underlying moment in UTC and compute the local display on the fly.
Try it now — free, no signup
Use the timestamp converter in your browser. Then, when you need it at scale with an API key and higher limits, grab the full Eveses API.