CleanorTools
Time

World Clock

Details

How to use World Clock

What the tool does, how to run it, and what to expect from the result.

How to track the time in several cities at once

The board starts with your own detected time zone plus Los Angeles, New York, London, and Tokyo. Every row ticks once a second and shows the local date, the live UTC offset for that instant, and the time.

You can add any of the 44 curated zones and remove any row you do not need. All of it is computed with the browser's built-in Intl time-zone support, so no request leaves your device.

  • Open the tool; your local zone is detected and added to the top of the board.
  • Choose a city from the "Add a time zone" dropdown and click Add zone.
  • Switch between 24-hour and 12-hour display with the clock format selector.
  • Read each row's UTC offset label to see whether that city is currently on daylight saving.
  • Click Remove on any row you do not need; the board resets on reload.
Tips

Getting a better result out of World Clock

Specific settings and thresholds, not general advice.

  • Your own zone is detected with Intl.DateTimeFormat().resolvedOptions().timeZone and pinned to the top of the board automatically, so the first row is always your reference point.
  • The picker offers 44 curated IANA zones, from Honolulu to Auckland, covering every major offset. It is a shortlist, not the full IANA database of 400-plus zones, so a city on an unusual offset may not be listed.
  • Each row shows the live UTC offset computed for that exact instant, not a static number. That is why Sydney can read UTC+11:00 in January and UTC+10:00 in July: the offset is derived from the browser's own time-zone database, which knows the DST rules.
  • The clock is only as right as your device clock. A laptop whose system time has drifted, or one set to the wrong zone, makes every row on the board wrong by the same amount, and nothing here corrects for that.
  • Offsets that are not whole hours are real and are handled: Kolkata is UTC+05:30, Tehran and Kathmandu have half and quarter-hour offsets. Never build scheduling logic that assumes an offset is an integer number of hours.
Limits

What World Clock does not do

The honest boundary, so you do not lose time finding it yourself.

  • 44 preset zones only, no free-text city search and no custom IANA zone entry.
  • The board is not saved; your chosen zones reset on reload.
  • No meeting planner view, no overlap-of-working-hours grid.
  • No time-server sync, so a wrong device clock makes every row wrong.
At a glance

Who World Clock is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

Remote teams tracking time across regions.

Ideal for

Using the world clock without installing anything or signing up.

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

How accurate is this clock?

It is exactly as accurate as your device's clock. The tool reads the current instant from your system every second and formats it into each zone using the browser's time-zone database. It does not query an NTP or time server, so if your machine is a minute fast, every city on the board is a minute fast.

Where do the daylight-saving rules come from?

From your browser and operating system, which ship the IANA time-zone database. That is why the offset shown for a city changes with the season without anything being downloaded, and it is also why a very old, unpatched device can show a wrong offset for a country that has recently changed its DST rules.

My city is not in the list. What can I do?

Pick any city on the same IANA zone; the time will be identical. The list is a curated 44 zones covering the world's major offsets, not the full IANA set. There is no free-text entry, so if you need an obscure zone, choose the nearest listed city that shares its rules.

Do my chosen cities stay on the board next time?

No. The board lives in page state and resets to the defaults on reload, plus your own detected zone. There is no local storage and no account, so nothing about where you are or who you work with is retained.

Why does one of the rows show an offset like UTC+05:30?

Because some zones are genuinely offset by a fraction of an hour. India is UTC+05:30 year-round, Nepal is UTC+05:45, and parts of Australia use half-hour offsets. The tool computes the offset in minutes and renders it as hours and minutes, which is the only correct way to show it.

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