Is UTC+00:00 the same as GMT?

For civil purposes they agree to within a second. Prefer UTC for technical writing; reserve GMT for the UK winter clock or historical context. See the UTC vs GMT guide for the full distinction.

Why is my offset different from last week?

Most often a daylight saving transition. The place did not move; the active offset from UTC did. Check the city page for the next clock change.

Can two cities share an offset but not a time zone?

Yes. An offset is only a number. Different IANA zones can show the same UTC±HH:MM today and diverge when one observes daylight saving and the other does not.

How to read a UTC offset

An offset such as UTC+09:00 tells you how far a local clock sits from Coordinated Universal Time right now. It is precise for a moment — and incomplete as a lasting label for a place.

Last updated 2026-08-09 · Written by the NowZones publisher in Denmark. Offsets and DST examples use the IANA Time Zone Database via the same libraries as the city clocks. This is editorial explanation, not legal, medical, or aviation advice.

The UTC±HH:MM form

Positive offsets are east of the UTC meridian: Tokyo at UTC+09:00 is nine hours ahead of Coordinated Universal Time. Negative offsets are west: New York in winter is typically UTC−05:00.

Minutes matter. India uses UTC+05:30 and Iran UTC+03:30, so treating every zone as a whole hour silently mis-schedules a large share of the world.

Write the sign and both digits. "UTC+5" is informal; "UTC+05:00" is unambiguous in documents and APIs.

Offsets move with daylight saving

Many regions change offset twice a year without changing their time zone identity. London is Europe/London all year, but the active offset flips between UTC+00:00 and UTC+01:00.

An invitation that says only "UTC−05:00" does not say whether the city will still be on that offset next month. Anchoring to a city or IANA id carries the seasonal rules with it.

Places without daylight saving — Tokyo, Delhi, Shanghai, Lagos — keep a stable offset year-round, which makes recurring cross-border meetings easier when the other side is the one that jumps.

Prefer zones over bare offsets

Store and share IANA identifiers (America/New_York, Asia/Kolkata) whenever software is involved. Convert to a numeric offset only for display at a specific instant.

Browse current city times on this site, or use the converter when you need "when it is 09:00 here, what time is it there?" without doing the arithmetic by hand.

If you must quote an offset in prose, pair it with a city name and a date — "Paris on 15 July (UTC+02:00)" — so a reader can reconstruct what you meant.

Try the tools

Frequently asked questions

Is UTC+00:00 the same as GMT?: For civil purposes they agree to within a second. Prefer UTC for technical writing; reserve GMT for the UK winter clock or historical context. See the UTC vs GMT guide for the full distinction.
Why is my offset different from last week?: Most often a daylight saving transition. The place did not move; the active offset from UTC did. Check the city page for the next clock change.
Can two cities share an offset but not a time zone?: Yes. An offset is only a number. Different IANA zones can show the same UTC±HH:MM today and diverge when one observes daylight saving and the other does not.