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World Clock · Time Converter · Working Hours

Compare Time Zones

Compare times across cities. Plan meetings. Work without timezone confusion.

World Clock

Add your first city

Search 170 major cities. Your selections are saved automatically.

How to convert time between time zones

  1. Open Timezone Converter

    Go to timezone-converter.hanoon.app in your browser.

  2. Select time zones

    Choose the source and target time zones from the dropdown lists.

  3. Enter the time

    Type or select the time you want to convert. The converted time appears instantly.

Frequently asked questions

How do I convert time between time zones?

In the Converter tab, choose a source city and target cities, then enter a date and time. Seoul 09:00 is London 00:00 on 2026-01-15, but London 01:00 on 2026-07-15. In each example, London is on the same calendar date as Seoul.

What is the overlap view?

The Working Hours tab shows overlapping business hours across multiple time zones, helping you find the best meeting times.

Does it account for daylight saving time?

Yes. The tool uses your browser’s IANA time-zone rules and warns about nearby offset changes. In New York, 2026-03-08 02:30 does not exist: a warning appears and conversion results are hidden until you choose another time. On 2026-11-01, 01:30 occurs twice. The first occurrence, UTC-04:00, is selected by default; you can choose the second, UTC-05:00.

Is my data sent to a server?

Cities, work hours, and the last tab may be stored in this browser. Only when you copy a share link are cities, tab, date, time, source, and hours encoded in a versioned #s= fragment. Fragments are not sent in HTTP requests; the fragment is moved to memory and removed before analytics starts. Legacy query links may reach the initial page request, but they are accepted once and cleaned before providers start. The tool, dialog, and clipboard fallback are masked from Clarity. Anonymous GA and Clarity measurement starts by default; Continue without cookies disables analytics storage while cookieless measurement continues.

How many time zones are supported?

The directory includes 170 major cities representing 156 IANA time zones.