World Timezones

Compare current times across cities and zones when scheduling calls, launches or travel across regions.

Who this is for

Anyone whose working day crosses a timezone: booking a call between Sydney and London without doing the arithmetic twice, working out whether a colleague in Manila is still online, lining a flight arrival up against a hotel check-in, or scheduling a release so it does not land in the middle of someone's night. It is just as useful in reverse — checking what your own 9am looks like to everyone else before you send the invite.

How to use World Timezones

1. Search for a city or timezone name.
2. Pin places you care about when the UI supports pins.
3. Compare the displayed local times.
4. Re-check around daylight-saving change dates.

Worked examples

Example 1. Pin London and Tokyo for an Asia–Europe meeting window.

Example 2. Compare a US city with an Australian city for a product launch hour.

Example 3. Search a secondary city when the primary zone name is unfamiliar.

Daylight saving

DST rules change. This page relies on timezone data available to the browser/OS. After major rule changes, update your device software for best accuracy.

Where these times come from

Every clock on this page is calculated from your own device's clock and converted using the timezone database built into your browser. Nothing is fetched from a server, which is why the page keeps working with the network off and never waits on a round trip — but it also means that if your computer's clock is wrong, every city shown here is wrong by the same amount. If the numbers look out by minutes rather than hours, check your own clock before anything else.

Because the browser supplies the timezone rules, daylight saving transitions come from the same source your operating system uses and update when it updates. A device that has not been patched in a long time can still hold outdated rules for countries that have since moved their daylight saving dates.

Common mistakes

Forgetting daylight saving is the classic. The gap between two cities is not fixed: London and Sydney sit 9, 10 or 11 hours apart depending on the month, because the two hemispheres change their clocks in opposite directions. Assuming a country has one timezone is the next — Australia runs several and includes half-hour offsets, and the United States spans four before you count territories. Quoting a time without naming the zone is the third; "3pm" in an email to three countries will be read three different ways.

Tips

Pin the handful of cities you actually deal with and switch to Pinned only, so you are not reading past forty rows to find the two that matter. When you agree a time, write it with the zone attached and a second city in brackets — "3pm AEST (5am BST)" removes the ambiguity that causes missed calls. If you are booking more than a fortnight ahead, check again nearer the date: a daylight saving change in between will shift the gap by an hour without either party doing anything.

Accessibility notes

Times are rendered as text rather than as clock faces, so a screen reader announces them directly and you can select and copy any of them. The city list is an ordinary scrollable list reachable by keyboard. Colour is not used to carry meaning on its own — day and night are stated in the text — so the page still reads correctly if you cannot distinguish the shades.

Limitations (honest)

• City search depends on the built-in places list.
• Device clock errors will show as wrong local times everywhere.
• Not a legal authority for historical timezone offsets decades ago.
• Requires JavaScript in a modern browser.

Privacy

Nothing you do here is sent anywhere. The clocks are calculated from your own device's clock using the timezone data built into your browser, and your pinned cities are remembered in this browser rather than in an account. There is no server call involved in showing a time, which is why the page keeps working offline. Advertising cookies and the choices available to you are covered in the Privacy Policy and in the consent notice shown on your first visit.

Related tools on ToolsAre.Us

Once you have settled on a time, the Countdown builds a shareable countdown to it in a named timezone, and the RSVP tool collects yes/no replies for it. For timing something in the room rather than across the world, use the Stopwatch and Timer. The full tool list is on the home page.

FAQ

More help: World Timezones FAQ · All tools · Contact · About