Timezone Converter

Accurate cross-timezone conversion

Using the browser's built-in IANA timezone database, the converter correctly accounts for each zone's UTC offset and daylight-saving rules at the chosen date. Swap source and target with one click.

It's ideal for scheduling calls, coordinating launches, or simply working out what time it is somewhere else.

Common uses

• Scheduling international meetings
• Coordinating remote teams
• Planning calls across continents

Key features at a glance

• Convert a time between any two IANA timezones
• Accurate UTC offsets and daylight-saving handling
• Swap source and target with one click
• Uses the browser's built-in timezone database
• Runs entirely in your browser
• Works offline once the page has loaded

Why timezone conversion is tricky

Converting a time between regions is harder than adding a fixed number of hours, because time zones are political as much as geographical. Offsets from UTC are not always whole hours — India is UTC+5:30 and Nepal UTC+5:45 — and the boundaries between zones follow borders rather than neat lines of longitude. A naive conversion that assumes simple hour offsets quietly produces wrong times.

Daylight saving time compounds the difficulty. Many regions shift their clocks forward in spring and back in autumn, but the exact dates differ by country and change over the years, and some places do not observe it at all. The result of a conversion therefore depends not just on the two zones but on the specific date. This tool relies on the IANA timezone database, which encodes all these rules, to get it right.

What the IANA timezone database does

Behind accurate timezone conversion sits the IANA time zone database, a continuously maintained record of every zone's offset and its full history of daylight-saving rules and political changes. Zones are identified by names like America/New_York or Asia/Tokyo rather than ambiguous abbreviations, because abbreviations like CST can mean several different things in different parts of the world.

Your browser ships with this database built in, which is what lets the converter compute the correct local time for any zone on any date, applying the daylight-saving rules that were in effect then. Because the database is updated as governments change their rules, conversions stay accurate even as the world's timekeeping shifts. This is far more reliable than memorizing offsets, which go stale.

Scheduling across time zones

The practical reason most people convert times is to schedule something across regions — a meeting, a call, a livestream, a deadline. The risk is real: a misconverted meeting time means someone joins an hour late or in the middle of the night. Converting the exact moment from one participant's zone to another's removes that uncertainty and lets everyone agree on a single instant.

A useful habit when coordinating across many zones is to anchor on UTC, the global reference, and convert from there to each local time. This avoids chaining error-prone conversions between regions. Whether you are planning a team standup, a webinar for a global audience, or a launch, converting carefully against accurate daylight-saving data is what keeps everyone in sync.

Tips for converting time zones

• Remember some offsets are half or quarter hours, not whole hours
• Daylight saving means the result depends on the specific date
• Use full IANA zone names rather than ambiguous abbreviations
• Anchor multi-region scheduling on UTC to avoid chained errors
• Double-check around the spring and autumn DST changeovers

Why choose our timezone converter?

Our converter is completely free with no signup, no limits, and no subscription. It runs entirely in your browser using the built-in IANA data, so conversions are instant and accurate, and the tool works offline.

It is one of more than 200 free tools on ToopTools, and you can pin it to your My Workspace, a personalized workspace where you keep the tools you use most in a single dashboard. Beside the world clock and other time tools, it makes coordinating across regions effortless.

Common use cases

People use the timezone converter to schedule international meetings and calls, to coordinate remote teams spread across continents, and to plan launches and events for audiences in different regions. It turns 'what time is that for them?' into an exact answer.

Travelers convert arrival and departure times, sports fans work out when a live event airs locally, and anyone with friends or family abroad checks a good time to call. Because it handles daylight saving and unusual offsets correctly, the converted time is one you can rely on.

Is the timezone converter free?

Yes. It is completely free with no account, no sign-up, and no usage limits. Convert as many times as you like at no cost.

Does it handle daylight saving time?

Yes. It uses the IANA timezone database to apply the correct daylight-saving rules for each zone on the specific date you choose, so the converted time accounts for any seasonal clock changes.

Why is the offset not a whole number of hours?

Some regions use offsets of 30 or 45 minutes — India is UTC+5:30 and Nepal UTC+5:45, for example. The converter handles these fractional offsets correctly, unlike a simple hour-based calculation.

Why use IANA zone names instead of abbreviations?

Abbreviations like CST are ambiguous and can refer to several different zones worldwide. Full IANA names like America/Chicago identify a zone unambiguously along with its complete daylight-saving history.

How should I schedule a meeting across many time zones?

Anchor on UTC and convert to each participant's local time, rather than chaining conversions between regions. This reduces errors, and double-checking around DST changeovers avoids the occasional one-hour slip.

Can I swap the source and target zones?

Yes. A single click swaps the source and target timezones, so you can instantly convert in the opposite direction without re-entering anything.

Are my conversions kept private?

Yes. Everything is computed in your browser and nothing is uploaded, so the times you enter stay private and the tool works without an internet connection.

How do I convert a time from one time zone to another?

Pick the source zone and time, choose the target zone, and the converter instantly shows the equivalent local time, automatically accounting for daylight saving. Swap the two zones with one click to convert in the opposite direction.

Does the timezone converter work offline?

Yes. The conversion runs entirely in your browser using built-in time zone data, so once the page has loaded the tool works without an internet connection, and nothing you enter is uploaded — it stays private on your own device.