World Clock

View current time in multiple cities around the world.

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About world clock

World Clock keeps its state in memory and nowhere else. That is why it forgets everything on reload, and why it cannot leak anything.

No server sees this. That is a consequence of how the tool is built rather than a policy someone wrote down, which is the version worth trusting.

You will find it under Clocks, alongside 7 other tools for the same sort of job.

Shows 10 major cities by default or custom IANA timezones.

How to use it

01
Start it
Every control is on the tool itself. Keyboard shortcuts, where there are any, are listed beside it.
02
Watch it run
It updates in the page as you go. Nothing is sent anywhere, so it keeps working with the network off.
03
Close when done
Nothing is stored between visits. Reloading gives you a clean start rather than picking up where you left off.

Examples

Default World Clock
Show current time in major cities worldwide
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Output
=== World Clock ===
Reference: 2026-08-24T09:36:21.943Z

New York         Mon, Aug 24, 2026 at 05:36:21 AM
London           Mon, Aug 24, 2026 at 10:36:21 AM
Paris            Mon, Aug 24, 2026 at 11:36:21 AM
Dubai            Mon, Aug 24, 2026 at 01:36:21 PM
Mumbai           Mon, Aug 24, 2026 at 03:06:21 PM
Singapore        Mon, Aug 24, 2026 at 05:36:21 PM
Tokyo            Mon, Aug 24, 2026 at 06:36:21 PM
Sydney           Mon, Aug 24, 2026 at 07:36:21 PM
Los Angeles      Mon, Aug 24, 2026 at 02:36:21 AM
Chicago          Mon, Aug 24, 2026 at 04:36:21 AM
Questions
Does World Clock work offline?+
Yes. It is JavaScript running in this tab, so once the page has loaded it needs nothing further from the network. Put the machine in flight mode and it carries on. Nothing you do here is sent anywhere, because there is nowhere for it to go.
Does it remember anything between visits?+
No. Reload the page and it starts from nothing. There is no account, no saved state and no cookie holding your last session. That is a deliberate trade: it cannot lose your data because it never keeps any.
Is it accurate?+
Timing comes from performance.now(), the high resolution clock the browser provides, rather than from setInterval, which drifts by a few milliseconds every tick and compounds over minutes. What can still shift things is the browser throttling a tab in the background, so leave it visible if the timing matters.
Does it make a sound?+
Where a sound makes sense, it is generated with the Web Audio API rather than loaded as a file, so there is nothing to download and nothing to block. Browsers refuse to start audio until you have interacted with the page, which is why the first press is what switches it on.
Can I use World Clock on a phone?+
Yes. The controls are sized for touch and the layout collapses to one column on a narrow screen. Bear in mind that a phone locking its screen will suspend the page, and timing stops with it.