Time Difference Converter

Find the time difference between any two cities, with daylight saving and half-hour offsets applied for the date you choose. A 24-hour overlap strip shows when both working days meet.

Popular pairs

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The gap is only half the answer

Knowing that Sydney is nine hours ahead of London does not tell you when to book the call. This page gives you the difference in plain words, then lays out all 24 hours side by side and shades the ones that sit inside office hours for both places. You get the number and the slot in the same glance.

50+ cities · live DST · exact offsets

Why use this time difference converter?

Daylight saving handled for you

Offsets are read for the exact date you choose, straight from the IANA time zone rules in your browser. No hard-coded gaps that go stale for three weeks every spring.

Half-hour and 45-minute zones kept exact

India at UTC+05:30, Nepal at UTC+05:45, and central Australia at UTC+09:30 are reported as they are, never rounded to the nearest hour.

A meeting planner built in

The 24-hour strip pairs every hour in one place with its match in the other and colours the overlap, so a workable slot is obvious without counting on your fingers.

Day changes called out

When a time crosses midnight, the result says next day or previous day next to the clock. That single label prevents the most common cross-border booking error.

How this Time Difference Converter works

Pick two places and the page asks your browser what the clocks read in each one. That question goes to the IANA time zone database, the same list behind Windows, macOS, Android, and iOS, so the answer already accounts for daylight saving, half-hour offsets, and every clock change a country has announced.

Reading live offsets matters more than it sounds. New York sits five hours behind London for most of the year, but for about three weeks each spring and autumn the gap is four, because the two countries change their clocks on different dates. Any converter with a hard-coded 5 is wrong during those weeks. This one recalculates for the date you selected.

Not every offset is a whole hour either. India runs at UTC+05:30, Nepal at UTC+05:45, and central Australia at UTC+09:30. The page reports those exactly, and it labels a result that lands on the day before or the day after the date you entered, which is where most scheduling mistakes come from.

Under the summary sits a strip covering all 24 hours. Each column pairs one hour in the first place with the matching hour in the second. Columns turn green when both sides are between 09:00 and 18:00, amber when one side is early or late but awake, and grey when someone would be asleep. That answers the question behind the search, which is not what the difference is but when the two of you can actually talk.

How to use this Time Difference Converter

1

Choose the two places

Pick a city in each dropdown, or tap one of the popular pairs. The page starts on your own time zone, so you usually only need to set the second one.

2

Set the date and time you care about

It opens on the current moment. Change the date if you are planning ahead, because a clock change on either side can move the gap by an hour.

3

Read the gap, then pick a slot

The summary says which place is ahead and by how much. The 24-hour strip below shades the hours that fall inside office time in both places.

Example Usage

Checking where a 9 pm call in New Delhi lands in Tokyo:

Input
From: New Delhi, 21:00 · To: Tokyo
Output
Tokyo is 3 hours and 30 minutes ahead of New Delhi New Delhi 21:00 UTC+05:30 Tokyo 00:30 UTC+09:00 (next day)

Frequently Asked Questions

How do I work out the time difference between two countries?
Subtract one UTC offset from the other. London at UTC+00:00 and New Delhi at UTC+05:30 are five and a half hours apart. Doing it by hand goes wrong when one side is on daylight saving and the other is not, which is why this page reads both offsets for the exact date you pick.
Why does the gap between New York and London change during the year?
Both countries change their clocks, but not on the same weekend. The United States moves forward in the second week of March and back in the first week of November. The United Kingdom moves in late March and late October. For roughly three weeks a year the usual five-hour gap becomes four.
Does the tool handle daylight saving on its own?
Yes. It uses the time zone rules built into your browser, which come from the IANA database. That database tracks every clock change each country has announced, so you do not have to remember which places are currently on summer time.
Which places are not a whole number of hours from UTC?
India and Sri Lanka run at UTC+05:30, Nepal at UTC+05:45, Iran at UTC+03:30, Newfoundland at UTC-03:30, and central Australia at UTC+09:30. Parts of Western Australia use UTC+08:45. The page reports these exactly rather than rounding to the nearest hour.
Why does the result say next day or previous day?
Because the gap pushed the clock past midnight. A 9 pm call in New Delhi lands at 12:30 am in Tokyo, which is already tomorrow there. Missing that is the most common scheduling mistake, so the label sits next to the time rather than in a footnote.
What is the difference between UTC and GMT?
For everyday scheduling they are the same. GMT is a time zone that the UK uses in winter. UTC is the global reference standard that every other offset is measured against, kept in step with atomic clocks. If a meeting invite says 14:00 UTC, treat it as 14:00 GMT.
How do I find a meeting time that works for both sides?
Use the 24-hour strip under the result. Each column pairs one hour in the first place with the matching hour in the second. Green columns fall inside 09:00 to 18:00 for both, so anything green is bookable without asking someone to start early or stay late.
What if there are no green hours at all?
That happens with pairs like Sydney and Los Angeles, where the working days barely touch. Look at the amber columns instead. Those mark hours that are early or late for one side but still awake, and they are usually the fairest compromise if you alternate who takes the awkward slot.
Do all countries change their clocks?
No, and fewer do each year. India, China, Japan, Singapore, most of Africa, and almost all of South America keep one offset all year. Within countries that do change, some regions opt out: Arizona and Queensland both stay on standard time while their neighbours move.
Can I check a time difference for a date in the future?
Yes. Change the date field and the offsets are recalculated for that day. This is worth doing for anything booked more than a month out, since a call that sits at 3 pm today can move to 2 pm after a clock change.
My city is not in the list. What should I pick?
Choose any city that shares your offset and your clock-change rules, which usually means the largest city in your own country. A user in Manchester picks London, and a user in San Diego picks Los Angeles. The result is identical because they sit in the same zone.
Is my location or my search history stored?
No. The page reads your time zone from your browser to fill in a sensible starting value, and that reading never leaves the page. There is no account, no logging, and nothing is sent to a server.

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