Convert any date and time between two timezones. Handles daylight-saving automatically. Essential for scheduling meetings across regions.
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How it works
We interpret your input as a wall-clock time in the source timezone, calculate the equivalent UTC instant, then re-format it for the target timezone. Because the browser has the IANA timezone rules built in, DST transitions are handled correctly.
Key features
- Any pair of IANA timezones
- Automatic DST handling
- Full date + time input
- Human-readable output with weekday and timezone name
Common use cases
Meeting scheduling
"3 PM Tokyo → what time in London?"
Flight arrival calculation
Convert departure and arrival times between origin and destination timezones.
Live event planning
Announce a webinar with a converted time for each major region.
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Pro tips
- ◆When in doubt, share UTC — it's unambiguous.
- ◆Note that GMT and UTC are almost identical but not synonymous — GMT observes British summer time in some contexts.
Common mistakes to avoid
- ✕Forgetting DST — the UK is UTC+0 in winter but UTC+1 in summer.
Frequently asked questions
What's the difference between UTC and GMT?▼
For most practical purposes they are identical. Technically UTC is defined by atomic clocks and GMT is astronomical.
Which timezones are supported?▼
All ~400 IANA timezone identifiers that your browser knows.
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