Pick the zones
Choose the source zone where the event happens and the target zone of the person you are coordinating with.
Unit converters
Time Zone Converter (World Clock)
Free online time zone converter and world clock
Convert a time
Local processingConverted time
World clock
Pick a date above to see the world clock table.
Press Ctrl or Command and Enter to run the tool.
About this tool
About this tool
Time Zone Converter maps a wall-clock time in one IANA time zone to the exact instant in another zone using the browser Intl API, including current daylight saving offsets. Choose any two zones from the full IANA list, set a date and time, and read the converted time plus a world clock table. Everything is calculated locally; no requests are sent.
Find the right moment for calls, meetings, and deadlines across time zones. Pick the source zone, the target zone, and a date and time, and the tool returns the exact equivalent instant, automatically accounting for daylight saving rules. A reference table shows the same moment in major cities around the world.
Built for daily work
- Schedule a call between colleagues on different continents.
- Convert a webinar time to your local zone before registering.
- Check store opening hours in another country.
- Plan a delivery or handover window across zones.
How to use this tool
How to use this tool
Set the date and time
Enter the local date and time in the source zone. Daylight saving offsets are applied automatically for that date.
Read the result
The converted time appears with the target zone offset, and the world clock table shows the same instant in major cities.
Key features
Key features
Full IANA zone list
Every zone from the browser time zone database is available, not just a handful of cities, so regional zones are covered.
Daylight saving aware
Offsets are computed for the exact date you choose, so summer and winter conversions both come out right.
World clock table
A reference panel shows the same instant across major world cities for quick scanning.
Local computation
Zone math uses the Intl API inside your browser. No server lookup, no data leaving the page.
Practical use cases
Practical use cases
- Schedule a call between colleagues on different continents.
- Convert a webinar time to your local zone before registering.
- Check store opening hours in another country.
- Plan a delivery or handover window across zones.
- Translate a flight arrival time to the destination local time.
Private by default
For local tools, input is processed in your browser and is not sent to application analytics.
Data processing noticeTechnical details
Technical details
ProcessingLocal browser processing (Intl API)
Zone sourceIANA time zone database via Intl.supportedValuesOf
Daylight savingAutomatic per selected date
Reference tableMajor world cities at the same instant
Limitations and important notes
Limitations and important notes
- Older browsers may expose a shorter zone list; a curated fallback list is used then.
- Future rule changes published after the browser update are not reflected.
- The tool converts instants, not recurring schedule rules.
Frequently asked questions
Frequently asked questions
It computes the offset for the exact date you enter using the IANA database, so a date in July and a date in January get their correct seasonal offsets.
The full IANA list covers countries, regions, and historical names. If your city is not listed, choose the country region that matches it, for example America/New_York for Eastern US time.
No. The calculation uses only the zones, date, and time you enter, so the result is the same on any device.
Yes. Once the page loads, zone conversion uses browser built-ins and needs no connection.
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