Timezone Converter — schedule across any two cities

A timezone converter answers one deceptively simple question: if it's a certain time here, what time is it there? That question gets harder the moment two people work in different countries, because clocks don't just shift by a clean number of hours — they shift by 30 or 45 minutes in some regions, and the shift itself changes twice a year wherever daylight saving time applies. This tool does the conversion for you using your browser's built-in timezone database, so you get an accurate answer without memorizing UTC offsets or guessing whether a country is "ahead" or "behind" this week.

At Arb Digital we build and market websites for teams that operate across borders — support desks with agents in three countries, marketing teams coordinating launches, agencies syncing with overseas clients — and a wrong meeting time is one of the most common, most avoidable ways a first impression gets ruined. This page exists so that never has to happen to you.

What This Timezone Converter Does

Enter a date and time, pick the timezone that time belongs to, and pick the timezone you want to see it in. The tool reads your input as a local "wall clock" time in the source zone — the way a clock on the wall in that city would actually display it — and translates it into the equivalent wall clock time in the destination zone, accounting for that zone's exact current UTC offset, including any daylight saving adjustment in effect on that specific date. It also shows the UTC time (the neutral reference every timezone is measured against), your own device's local time for comparison, and whether the destination zone is currently observing daylight saving.

Because it reads the offset live from your browser's timezone data rather than a static lookup table you hardcode, it stays correct even as daylight saving start and end dates shift, and even for the handful of countries that have changed their rules in recent years.

How to Use It

1. Leave the date and time blank for "right now." The converter defaults to the current moment if you don't set a date and time.
2. Pick the source timezone. This is the city or region the date/time you entered actually belongs to — for example, if a colleague in London tells you "let's talk at 3pm," set the source to London.
3. Pick the destination timezone. This is where you (or your other meeting participant) actually are.
4. Click Convert Time. The result shows the equivalent local time, the UTC time, the raw hour difference between the two zones, and whether the destination is currently in daylight saving time.
5. Recheck close to the meeting date if you're planning weeks ahead — see the DST section below for why the gap between two zones isn't always fixed.

How the Conversion Actually Works

Every timezone on Earth is defined as an offset from UTC (Coordinated Universal Time), the modern successor to Greenwich Mean Time and the reference point the whole system hangs off. New York is UTC-5 in winter and UTC-4 in summer. Karachi is a fixed UTC+5 all year. India is UTC+5:30 — a 30-minute offset that surprises a lot of people used to whole-hour zones. Nepal goes further and sits at UTC+5:45. Behind the scenes, this tool converts your entered time into a true UTC instant using the source zone's offset on that exact calendar date, then re-renders that same instant using the destination zone's offset on that date. That two-step process — local time to UTC, then UTC to a different local time — is exactly how the IANA Time Zone Database that browsers, phones, and servers all rely on handles it internally, which is why the result matches what a phone in that city would actually show.

This matters because a "timezone" is really two things layered together: a base UTC offset, and a set of rules about when daylight saving shifts that offset. A converter that only knows the base offset will be wrong for roughly half the year in any zone that observes daylight saving — which is most of North America and Europe, but not all of it.

Daylight Saving Time: Where Meeting Scheduling Breaks

Daylight saving time (DST) is the single biggest source of scheduling errors between countries, and the reason is almost never the math — it's the calendar. The United States and Canada currently shift clocks on the second Sunday of March and the first Sunday of November. The European Union shifts on the last Sunday of March and the last Sunday of October. Those dates don't line up. For roughly three weeks each spring and each autumn, the US has already changed its clocks while Europe hasn't, or vice versa — which means the "usual" hour gap between, say, New York and London (5 hours) temporarily becomes 4 hours, and any recurring meeting invite that assumed a fixed offset silently lands an hour off for everyone on one side of the call.

A second, quieter trap: many countries near the equator, and a growing number of others, don't observe daylight saving at all. Pakistan, India, China, and most of Africa keep one offset year-round. If you're scheduling between a DST-observing country and a non-DST country, the gap between them changes twice a year even though only one side's clock actually moved. This is exactly the kind of detail that trips up global teams, and it's why "just remember it's usually an 8-hour difference" eventually produces a missed call.

A third trap is the "same day, different day" problem. Because of how offsets stack with the calendar, converting a late-evening time from one zone to a zone many hours ahead often rolls into the next calendar date — 11pm Tuesday in Los Angeles is already Wednesday afternoon in Singapore. Calendar invites that only show a time and not a date are a frequent cause of a meeting quietly happening a day earlier or later than one side expected.

Why Fixed UTC Offset Tables Go Stale

It's tempting to build a spreadsheet of "City X is UTC+5, City Y is UTC-8" and treat it as permanent. That approach breaks in three ways: daylight saving flips the offset twice a year for many cities; a handful of countries have changed their DST rules or abolished DST entirely within the last decade (several US states have debated ending the twice-yearly switch, and countries occasionally realign for political or economic reasons); and some cities you'd assume share a zone with a neighboring country actually don't, because timezone borders follow political boundaries, not longitude lines. Software that reads from a maintained timezone database — as this tool does through your browser — sidesteps all three problems, because the underlying data is updated by international maintainers whenever a country changes its rules, and your browser picks up those updates automatically.

Common Real-World Uses

• Scheduling client calls across a US-based agency and an overseas client, without doing mental math at 11pm.
• Coordinating product launches so a "9am release" lands at a sensible hour in every market, not the middle of the night somewhere.
• Planning international travel — working out what time you'll land relative to home, or when to call family back home.
• Remote and distributed teams figuring out a fair rotating meeting time so the same region isn't always stuck with the 6am slot.
• Live events and webinars advertised to a global audience, where you need to publish several local start times.

Common Mistakes to Avoid

• Assuming a fixed hour gap year-round. The offset between two zones can change twice a year if only one of them observes daylight saving.
• Forgetting the date can roll over. A conversion across a large gap can push the time into the previous or next calendar day — always double check the date, not just the hour.
• Confusing a city with its country's only zone. Large countries like the USA, Russia, and Australia span multiple zones — "US time" alone isn't enough information.
• Ignoring half-hour and 45-minute offsets. India, Iran, and Nepal don't sit on whole-hour boundaries, which breaks naive "add N hours" math.
• Scheduling a recurring meeting once and never revisiting it. A recurring weekly call across a DST boundary needs to be re-checked when either region's clocks change.

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Frequently Asked Questions

A Note on Precision

One reason we built this as a live calculation rather than a static lookup chart is that timezone rules are not permanent. Countries occasionally shorten, extend, or abolish daylight saving; borders of a timezone can be redrawn when a region aligns itself with a neighboring country for trade or logistics reasons; and even long-standing offsets like Venezuela's or parts of Australia's have moved within the last twenty years. A printed chart is correct on the day it's printed and slowly drifts out of date. A calculation that pulls from your device's maintained timezone database updates itself the moment your operating system does, which is typically within days of any official change being announced anywhere in the world.

This is also why we'd caution against copying a timezone gap you calculated once into a permanent note or recurring calendar entry without a source. "Karachi is 10 hours ahead of New York" is true on some days and false on others, purely because New York observes daylight saving and Karachi does not. Re-running the conversion for the actual date in question — rather than trusting a memorized rule of thumb — is the only way to be certain, and it takes about as long as typing the date into the fields above.

This tool runs entirely in your browser using built-in JavaScript. Nothing you enter is uploaded, stored, or sent to any server.