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World Clock Calculator

Free world clock — compare local times across cities, see who is awake or at work, and find the meeting hour that works for everyone.

Pick up to 6 cities (3 selected):

The lit half is in daylight; the dashed line is the terminator, where sunrise and sunset are happening right now.

🇬🇧 London

21:00

Tue 06 Oct

UTC+1

🇺🇸 New York

16:00

Tue 06 Oct

UTC-4 · -5h vs London

🇯🇵 Tokyo

05:00

Wed 07 Oct

UTC+9 · +8h vs London

No hour works for everyone during 9–18

Someone will need to take the call outside normal hours — the amber band shows who is at least awake.

Times come from your device's own time-zone database, so daylight saving is applied automatically and correctly — including the weeks when regions have already switched and others have not. Working hours are assumed to be 09:00–18:00 local, which is a convention rather than a rule.

Instant insight

3 zones spanning 13 hours
Every zone here sits on a whole hour, so the arithmetic is simple — but do not assume that of any zone you have not checked.
With a spread this wide there may be no hour that is reasonable for everyone. Rotate which region takes the awkward slot.
Offsets are not fixed properties of a place
Daylight saving moves many zones twice a year, and the northern and southern hemispheres change on different dates — so the gap between two cities varies through the year.
For a recurring meeting, re-check the offsets after each clock change.

Worked out in your browser — nothing is sent anywhere.

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Common world clock

New York → London = 5 hours ahead
London → New York = 5 hours behind
London → Tokyo = 9 hours ahead
New York → Los Angeles = 3 hours behind
London → Sydney = 10 hours ahead
New York → Tokyo = 14 hours ahead
London → Dubai = 4 hours ahead
London → Mumbai = 5½ hours ahead
Kigali → London = 2 hours behind
Kigali → New York = 7 hours behind
UTC → New York = 5 hours behind
UTC → Tokyo = 9 hours ahead

Everyday Uses

Scheduling international meetings

Find the overlap where everyone is genuinely at work, rather than guessing and apologising later.

Planning travel calls

Check what time it will be at home before promising to ring, so you don't wake anyone.

Working with distributed teams

See at a glance who is awake right now before sending a message expecting a quick reply.

Calling family abroad

Confirm the local time and date on the other end before dialling.

Linking classrooms

Find a lesson slot that works for two schools in different countries.

Following live events

Convert a broadcast time into your own so you don't miss the start.

Frequently Asked Questions

How do I find a meeting time that works across time zones?

Select the cities involved and the calculator shows each one's local time on a shared 24-hour band, with working hours (09:00–18:00) shaded. Where the green bands line up is when everyone is at their desk. If no hour overlaps, it says so — and the amber band shows who at least would be awake, which is usually the basis for a fair compromise.

Does this handle daylight saving time correctly?

Yes, and this is where most time-zone tools go wrong. Times are read from your device's own IANA time-zone database rather than from stored UTC offsets, so daylight saving is applied automatically. That matters most in the two or three weeks each spring and autumn when some regions have switched and others have not — the period when manual offset tables quietly give the wrong answer.

Why is the difference between two cities not a whole number of hours?

Several zones run on 30- or 45-minute offsets. India is UTC+5:30, Nepal is UTC+5:45, parts of Australia are UTC+9:30, and the Chatham Islands are UTC+12:45. These are genuine offsets, not errors. The calculator shows fractional differences rather than rounding them, because rounding is how meetings get missed.

Can I check a specific future time rather than right now?

Yes — switch to 'A specific time', enter the hour and choose which city it refers to. Every other city updates to show what that instant is locally. This is the reliable way to schedule: pick the time in your own zone and read off what it means for everyone else, rather than doing the arithmetic mentally.

Why does one city show a different date?

Because the world spans more than 24 hours of offsets. When it is Monday evening in Los Angeles it is already Tuesday afternoon in Tokyo. Each card shows its own weekday and date for exactly this reason — a meeting agreed for 'Tuesday 9am' can land on different calendar days for different attendees, which is a common and avoidable scheduling error.

What counts as working hours here?

The green band is 09:00–18:00 local and the amber band is 07:00–22:00. These are conventions, not rules, and they vary by culture and role — many countries take a long midday break, and plenty of people work outside them. Treat the bands as a starting point for a conversation rather than a verdict.