World Clock
Compare the current civil time across selected IANA time zones. Processing takes place locally in your browser.
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What World Clock does
Compare the current civil time across selected IANA time zones.
Worked example
Input
New York, London and Tokyo
Result
Current local date, time and UTC offset for each city
How the date or time is calculated
One current instant is formatted under each zone’s offset and daylight-saving rules supplied by the browser.
Useful workflows
- Check schedules, intervals or calendar labels before transferring them to another system.
- Compare UTC with a named local time zone instead of relying on an unexplained offset.
- Copy a result together with its date format and counting convention for later review.
Limits and important checks
- Time-zone rules can change by government decision; device/browser data may be outdated.
- Ambiguous numeric dates such as 03/04/2026 should be entered with an unambiguous format.
- For legal, payroll, travel or financial deadlines, confirm the result against the responsible authority or system.
Frequently asked questions
Which time zone is used?
The selected zone is used when shown. Otherwise the page normally uses the browser device’s current local time zone; review the displayed offset.
Why is another calendar one day or one hour different?
Check inclusive counting, midnight boundaries, daylight-saving rules, seconds versus milliseconds and the selected calendar system.
Processing takes place locally in your browser.