Timezone Converter

Timezone converter — free, accurate, and private

Working out what time a meeting falls in another part of the world is error-prone in your head, especially once daylight saving time is involved. This converter does it for you: pick a date and time in one timezone and see the exact equivalent in as many other zones as you like, side by side. It runs entirely in your browser using the same timezone data your operating system uses, so nothing is uploaded and it works offline.

It starts in your own timezone with the current date and time already filled in, so you can convert straightaway. Add the cities or regions you care about, and every result updates live as you change the source time.

How to convert between timezones

Choose the source date, the source time, and the timezone they belong to. The converter treats that as a single moment in time and then shows what that same moment looks like on the clock in each of your target zones. For example, 9:00 AM in New York is 2:00 PM in London and 11:00 PM in Tokyo — one instant, three different local times. Add as many target zones as you need and remove any you don't; it's built for lining up a call across several countries at once.

Why the date can change

Because zones are offset from each other by hours, converting a time can push it into the previous or next calendar day. If it's 8:00 AM Wednesday in Tokyo, it's still 6:00 PM Tuesday in New York — the day rolls back. The converter always shows the full weekday and date for each zone, and flags when a result lands on a different day with a "next day" or "previous day" label, so you never book a call for the wrong date. This matters most across the Pacific, where neighbours on the map can be nearly a full day apart on the clock.

Daylight saving time is handled for you

Daylight saving time is where manual conversions go wrong. Countries shift their clocks on different dates — and some don't shift at all — so the gap between two cities isn't fixed. London and New York are usually five hours apart, but for a couple of weeks each spring and autumn, when one has changed and the other hasn't, the gap is four or six hours instead.

This tool doesn't guess at any of that. It uses the timezone database built into your browser and operating system — the same IANA data that powers phones and calendars — which knows the exact DST rules and historical changes for every zone. When you pick a date, the conversion reflects whether DST was actually in effect in each place on that date, so the result is correct even around the awkward changeover weekends.

Planning meetings across countries

The most common use is scheduling: finding a time that works for people in different countries. By adding everyone's zone to the list, you can nudge the source time until the result is a reasonable hour for all of them — not the middle of someone's night. It's equally useful for catching a live broadcast, a sale launch, or a market open stated in another zone; coordinating with family or friends abroad; or planning around flights and travel, where departure and arrival times are given in local time.

Works on your phone

The converter is built mobile-first. The date and time fields use the native pickers, and the timezone menus use the native dropdown, so on a phone you get the familiar controls instead of fiddly typing. Each converted zone is shown as a clear card with the time, date, and offset, and the whole thing updates instantly because it runs locally.

Privacy: everything stays on your device

All the conversion happens in your browser using built-in timezone data. Nothing you enter is uploaded, nothing is stored on a server, and there is no account to create. It works the same online or offline, because it never needs to contact a server in the first place.

Frequently asked questions

How do I convert a time between timezones?

Pick the date, time, and source timezone, then add the timezones you want to see. The tool shows the same moment as a local time in each zone, with the day and date, and updates live as you change the source.

Does it account for daylight saving time?

Yes. It uses the timezone database built into your browser, which knows each zone's DST rules, so conversions are correct for the specific date you choose — including the weeks when countries change clocks on different dates.

Why does the date sometimes change?

Because zones can be many hours apart, a time can fall on the previous or next calendar day in another zone. The converter shows the full date for each zone and flags when it lands on a different day.

Is my data uploaded to a server?

No. Everything runs in your browser — nothing you enter leaves your device, and nothing is stored or sent anywhere.