Which tool should I use?
The quickest way to the right one.
| If you want to… | Use |
|---|---|
| Convert a time between any two zones | Time Zone Converter |
| Convert to or from UTC | UTC Converter |
| Convert to or from GMT | GMT Converter |
| Find a meeting time across zones | Meeting Planner |
UTC, GMT, and daylight saving
UTC (Coordinated Universal Time) is the modern world reference that every time zone is defined against — for example, New York is UTC−5 in winter. GMT (Greenwich Mean Time) is a time zone that happens to match UTC for most everyday purposes, which is why people often use the two interchangeably.
The reason a “simple” time-zone conversion goes wrong is daylight saving: many regions shift by an hour twice a year, and not on the same dates. These tools account for that automatically. If you just need to reformat a single time rather than move it between zones, see the time format converters.
Frequently asked questions
Is UTC the same as GMT?
For everyday use they line up, but they aren’t technically identical: UTC is a precise time standard, while GMT is a time zone. Most conversions treat them as the same offset.
Do these tools account for daylight saving?
Yes. Conversions use each region’s daylight-saving rules, so a time is correct for the date you choose.
What is the world’s reference time?
UTC. Every time zone is expressed as an offset from UTC, such as UTC+1 or UTC−8.
Are the tools free?
Yes, every time-zone tool is free and runs in your browser.
Explore other categories
Every tool here is built and reviewed by Fletcher Langley, with the method shown on each page and examples verified by hand — see our editorial policy.