Free World Clock Online

World Clock: See the Current Time in Any City or Timezone at a Glance

A world clock keeps several places on the planet visible at once, each card ticking forward in real time so you can see what hour it actually is in Tokyo, London, or São Paulo without doing any mental math. This tool starts you off with nine major cities already loaded — New York, London, Tokyo, Sydney, Dubai, Los Angeles, Paris, Singapore, and São Paulo — and every clock updates once a second, driven entirely by JavaScript running in your browser tab rather than a server somewhere refreshing a page for you.

It's a different job from converting a single appointment time from one zone to another: this page answers "what time is it right now, everywhere I care about," continuously, while a separate tool on this site — the timezone converter — answers "if it's 2pm on this particular date in Chicago, what time is that in Berlin." Reach for the clock when you want a live, always-on view of several places at once; reach for the converter when you're pinning down one specific date and time. Both share the same underlying timezone math, and both are also exposed as a metered API endpoint for anyone building the same lookups into their own application.

How the World Clock Works

The page is a grid of city cards plus a search box for adding more:

1. Nine default cities load automatically the moment the page opens, each showing a large, continuously updating clock alongside the current weekday and date in that city.
2. Type a city or region name into the search field to filter the full list of IANA timezone identifiers your browser supports — matches appear in a dropdown, and clicking one adds a new card to the grid instantly.
3. Every card includes a small trash-can icon; clicking it removes that city from your grid without affecting any of the others.
4. Each card's background and icon shift between a light, sun-lit look and a dark, moon-lit look depending on whether the local hour in that city currently falls between 6am and 6pm — a quick visual cue for whether it's a reasonable time to call someone there.
5. A short abbreviation tucked into the corner of each card — things like EST, GMT+1, or JST — shows the timezone label your browser reports for that zone at this exact moment.

Nothing here needs a sign-in or a saved profile: the set of cities you've added lives only in the current browser tab, and closing the page or reloading it resets the grid back to the nine defaults.

When You'd Reach for a World Clock

A handful of everyday situations explain why this kind of always-on multi-city view gets used constantly:

• Distributed teams checking overlap hours. A team split across three or four offices can glance at one grid to see who's likely at their desk right now, instead of separately recalling each colleague's offset.
• Planning a call before you schedule it. Seeing that it's already 9pm in Singapore while it's only 8am in Los Angeles makes an awkward call time obvious before you send the invite, rather than after someone complains.
• Travelers keeping a home-base reference. Someone on a trip can keep their home city's card pinned alongside their current location to judge when it's safe to call family without waking them.
• Watching market or event opening times. Traders, streamers, and anyone tracking a live broadcast that starts at a fixed local time in another country can watch that city's clock approach the start hour directly.
• Simple curiosity about a far-off place. Sometimes you just want to know whether it's daytime or the middle of the night somewhere specific, and a glance at the sun or moon icon answers that instantly.

Why the Clock Stays Accurate Through Daylight Saving Changes

Timezones aren't fixed offsets from UTC — a large share of them shift by an hour twice a year for Daylight Saving Time, and the exact dates those shifts happen vary by country and sometimes by region within a country. This tool never hardcodes an offset for any city; instead it asks the browser's built-in timezone database, the same IANA data that powers date formatting across the web platform, what the correct offset is for that zone at this specific instant. That's why New York's card can correctly show itself five hours behind UTC in January and only four hours behind in July, without the tool needing any seasonal adjustment logic of its own — the browser already knows the rule for exactly when America/New_York switches between standard and daylight time.

Zone behavior	What it means for the clock
Observes DST (e.g. America/New_York, Europe/London)	Offset from UTC shifts by an hour on the switch dates; the card adjusts automatically
Never observes DST (e.g. Asia/Tokyo, most of Asia and Africa)	Offset from UTC stays constant all year
Half-hour or 45-minute offset (e.g. Asia/Kolkata, Asia/Kathmandu)	Displayed and computed exactly, not rounded to the nearest whole hour
Southern Hemisphere DST (e.g. Australia/Sydney)	Shifts on the opposite months from Northern Hemisphere zones, since their summer falls in December-February

One consequence worth knowing: a city name doesn't always map to a single timezone identifier the way you'd expect, and a country can span several. The United States alone covers six distinct zones once Alaska and Hawaii are included, and searching by the specific identifier — America/Denver rather than just "Denver time" — is the more reliable way to add exactly the zone you mean.

What the Zone-Lookup API Adds Beyond the Page

The browser page is built for a person glancing at a grid, but the same offset-and-local-time lookup is also available as a direct request: pass a comma-separated list of up to 50 IANA timezone identifiers and, optionally, a specific instant to compute for — omit that instant and the response defaults to the current moment, the same as the live grid does. What comes back is a small array, one entry per zone, each carrying that zone's current UTC offset and its local wall-clock reading at the requested instant.

That's useful anywhere nobody is actually sitting in front of a browser tab watching the clocks tick: a support dashboard showing each regional team's current local time next to their ticket queue, a status page footer listing "last updated" across several regional times at once, or a scheduled job that logs what the local time was in a dozen offices the moment an incident started. Because the lookup accepts a specific instant rather than always defaulting to right now, it also works for reconstructing what the local time in a given city was at some point in the past — handy for annotating historical log entries or support tickets with a reporter's likely local time instead of only a bare UTC timestamp.

Every call is metered at the same flat rate whether the request lists one zone or the full fifty, so batching an entire team's cities into a single call is more efficient than looping the endpoint once per city.

Common Misreadings of a Multi-City Clock

A few mistakes come up often enough to flag directly. Assuming every offset is a whole number of hours trips people up with zones like India or Nepal that sit on a half-hour or 45-minute boundary rather than a clean hour mark. Assuming a country uses one timezone everywhere is another — Russia spans eleven zones and the continental United States spans four, so picking "the" zone for a large country can be flatly wrong depending on which city within it you actually mean. And forgetting that Southern Hemisphere countries flip their Daylight Saving schedule relative to the Northern Hemisphere means a card for Sydney might already be past its own switch date while New York's card hasn't reached its own yet, even though both zones observe DST.

Checking Multiple Times by Hand vs. Using This Clock

There's more than one way to figure out what time it is somewhere else, and each has tradeoffs:

• Mental math with a fixed offset. Memorizing "London is five hours ahead" works until the Daylight Saving dates in the US and the UK don't line up for a few weeks each spring and fall, during which the true offset briefly changes to four or six hours instead of five.
• A phone's built-in clock app. Most phones let you add a handful of world clock entries, which works well for a short, fixed list of places but is slower to search and add a new city to on the fly than typing into a browser tab.
• Searching a single city's time in a search engine. Quick for one lookup, but it doesn't give you a live, continuously updating side-by-side view of several places the way a dedicated grid does.
• A spreadsheet with manual offset columns. Common in scheduling templates, but any DST-observing zone in that spreadsheet needs its offset column corrected by hand twice a year or the whole sheet quietly drifts an hour off for weeks.
• This tool's API. An application that needs to display the current local time in a set of cities — a scheduling widget, a support dashboard, a shipping tracker — can request the same zone lookups programmatically instead of re-deriving offsets itself; see the API documentation for the request parameters and how usage is metered.

Does this world clock save the cities I add?

No. The list of cities on your grid exists only in the current browser tab's memory. Reloading the page, closing the tab, or visiting from a different device brings back the nine default cities rather than any custom list from an earlier visit.

How does the tool know when a city switches in or out of Daylight Saving Time?

It doesn't track DST rules itself — it asks the browser's built-in timezone database for the correct offset at the current moment, and that database already encodes exactly when each zone's clocks move forward or back. As long as the browser's timezone data is current, the switch happens automatically with no action needed on this page.

Can I add any city in the world, or only the nine shown by default?

Any timezone your browser recognizes can be added through the search box, which covers essentially every populated region on Earth via the standard IANA timezone identifiers, not just the nine starting cities.

Is this the same as the timezone converter tool?

They share the same DST-aware timezone lookups but answer different questions. This page shows the current, continuously updating time in a list of places; the separate timezone converter is for translating one specific date and time you type in from one zone into another, which isn't something this live grid is built to do.

Related Time Tools

If you need to work out what a specific appointment time becomes in another zone rather than just watching the current time tick by, the timezone converter handles that one-off translation directly. Once you've settled on a date across zones, the day of week calculator confirms which weekday it actually falls on, and the countdown timer can count down to that moment from wherever you're watching it.