Free online calculator
World clock
Compare times across cities.
World clock
Current time in selected cities — updates every second.
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How to use this calculator
- 1
See default cities
New York, London, Kyiv, and Tokyo appear on first load.
- 2
Add a city
Open the city picker, choose from the list, and it appears in the grid.
- 3
Remove a city
Click the × on any city card to remove it from the view.
- 4
Selection is saved
Your city list is saved in your browser and restored on your next visit.
FAQ
Does it handle daylight saving time? +
Yes. The clock uses your browser's Intl.DateTimeFormat API with the city's IANA time zone, which automatically applies the correct offset for the current date including DST transitions.
Can I add cities not in the list? +
Version 1 supports a preset list of 29 major cities. Custom city entry is planned for a future release.
Where does the time data come from? +
All times are computed in your browser using the JavaScript Intl API — no external time service is called. The accuracy depends on your device clock.
Is my city selection saved? +
Yes, the selection is stored in localStorage under a versioned key and restored automatically on your next visit.
Does the clock update automatically? +
Yes. The time for all displayed cities updates every second using a JavaScript interval.
About this calculator
This world clock shows the current time and date for up to 29 major cities simultaneously, with live UTC offset for the active daylight saving period. Use it to schedule remote calls, plan travel arrivals, or check overlap between time zones before sending a message.
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