World Clock
Add a city and it starts ticking. We handle the time difference for you.
Search for a city above to add your first clock.
One glance across every time zone
Coordinating anything across borders — a video call, a product launch, a market open, a flight — means answering "what time is it there, right now?" without doing hour arithmetic in your head. This world clock shows your own time alongside any cities you add, each with a live clock, an offset from you, and a Yesterday / Today / Tomorrow label so you can see at a glance whether a city has already crossed into the next calendar day.
How to use it
- Type a city into Add a city and pick it from the suggestions.
- Choose 12-hour or 24-hour display.
- Your cities and format choice are saved locally, so the same board is waiting on your next visit. Nothing is uploaded and no account is needed.
How the times are worked out
Every clock is derived from your own device's clock, then shifted into each city's zone using your browser's built-in IANA time-zone database. That database already encodes each country's daylight-saving rules and the exact dates they switch, so the tool never stores fixed offsets — when a city springs forward or falls back, its clock updates on its own. Offsets are computed in minutes, not whole hours, so half- and quarter-hour zones display exactly.
Worked examples
Standard-time UTC offsets for common cities
Offsets shift by an hour wherever daylight saving applies, so the live clock is always the source of truth; this table is a standard-time reference.
| City | Standard offset (UTC) | Observes DST? |
|---|---|---|
| Los Angeles | −8:00 | Yes |
| New York | −5:00 | Yes |
| London | +0:00 | Yes |
| Paris / Berlin | +1:00 | Yes |
| Mumbai | +5:30 | No |
| Kathmandu | +5:45 | No |
| Singapore | +8:00 | No |
| Tokyo / Seoul | +9:00 | No |
| Sydney | +10:00 | Yes |
Common mistakes
- Assuming a fixed offset. "New York is always 5 hours behind London" breaks twice a year — the offset is not constant, which is why hard-coding it causes missed meetings.
- Forgetting the date can differ. A 9:00 AM slot for you may already be the next evening for a teammate; the Yesterday / Today / Tomorrow label exists to catch exactly this.
- Rounding half-hour zones. India, Nepal, Iran and parts of Australia are not on whole-hour offsets; treating them as such leaves you 30–45 minutes off.
- Expecting DST everywhere. The northern and southern hemispheres switch in opposite seasons, and much of Asia, including Japan, Korea and India, does not change at all.
How accurate is it?
Each clock is exactly as accurate as your own device, because it starts from your system time and only shifts the zone. If a city looks a few minutes off, check that your computer or phone is set to sync its clock automatically over the network — this is a time-zone converter, not an independent atomic time source.
Sources & further reading
Frequently asked questions
Is daylight saving time (DST) handled automatically?
Yes. This world clock never stores fixed offsets. It reads the live time for each city from your browser's built-in IANA time zone database, which already knows every country's daylight saving rules and the exact dates they switch. So when a city springs forward or falls back, its clock here updates on its own — you never have to adjust anything.
How are 30- and 45-minute offsets like India +5:30 or Nepal +5:45 calculated?
The offset badge is worked out in minutes, not whole hours, by comparing each city's wall-clock time with yours. That means half-hour and quarter-hour zones such as India (+5:30), Nepal (+5:45), Iran (+3:30) and parts of Australia (+9:30) are shown exactly, instead of being rounded to the nearest hour like some clocks do.
Is my list of cities saved?
Yes, inside your own browser. The cities you add and your 12- or 24-hour choice are stored locally with localStorage on your device, so they are still there on your next visit. Nothing is uploaded to a server and no account is needed. In private browsing the list simply resets when you close the tab.
How accurate is the time shown?
Every clock is calculated from your device's own clock and then shifted into each city's time zone, so the world clock is exactly as accurate as your computer or phone. If a city looks off by a few minutes, check that your device is set to update its clock automatically over the network.
How do I use the Yesterday / Today / Tomorrow labels to schedule meetings?
The label under each city tells you whether that city is on a different calendar day from you right now — handy when you book a call across time zones. If a teammate's city shows Tomorrow, a 9 a.m. slot for you may already be their next evening, so you can pick a time that is daytime for everyone using the sun and moon icons.