Timezone Converter

The Timezone Converter is a free online tool that converts a date and time from one time zone to another, showing the equivalent moment along with its UTC offset in a clean, readable format. Pick a date, choose a source zone and a target zone, and the answer appears instantly.

It relies on your browser's built-in Intl engine, so daylight saving time is handled automatically and nothing you enter ever leaves your device.

How to convert between time zones

1. Choose the date and time you want to convert.
2. Select the From time zone (it defaults to your local zone).
3. Select the To time zone you want the equivalent time in.
4. Read the converted time, its UTC offset, and the matching moment in UTC.
5. Use Swap to reverse the direction or Copy Result to save it.

Why time zone conversion is tricky

Converting time is rarely as simple as adding or subtracting a fixed number of hours. Offsets shift twice a year in regions that observe daylight saving, and the exact dates differ between countries.

Some zones use half-hour or even 45-minute offsets, and a few change their rules from year to year. Doing this by hand invites mistakes, especially when scheduling across several regions.

How does this tool get it right?

This converter delegates the hard part to the Intl.DateTimeFormat API, which ships inside every modern browser and carries a full IANA time zone database.

Because the offset is computed for the specific date you select, transitions such as spring-forward and fall-back are applied automatically. You never have to remember when a country switches its clocks.

Understanding UTC offsets

Every zone is described by how far it sits ahead of or behind Coordinated Universal Time, written as something like UTC+09:00 or UTC-05:00. The converter shows this offset next to each result so the relationship is obvious.

Because the offset reflects the chosen date, you will see it change for the same city depending on whether daylight saving is active, which is exactly what makes manual conversion so error-prone.

What is the world clock for?

Below the converter, a small world clock shows the moment you selected across a dozen major cities at once. It is handy for planning a call or a launch that spans several regions.

Each city lists the local date, time, and current offset, updating whenever you change the date above.

Common uses for a timezone converter

Remote teams use it to pick meeting times that work for everyone. Travelers use it to figure out arrival times and to call home without waking anyone.

Developers use it to reason about timestamps, and event organizers use it to publish start times that make sense worldwide. Any task that spans regions benefits from a quick, reliable conversion.

Related date and time tools

Time work rarely stops at one conversion. Turn epoch values into human-readable dates with the Unix Timestamp Converter, measure the span between two dates with the Date Difference Calculator, and work out someone's exact age with the Age Calculator.

Frequently Asked Questions

How does the timezone converter handle daylight saving time?

It uses your browser's built-in Intl engine, which knows the daylight saving rules for every IANA time zone. Because the offset is calculated for the specific date you choose, spring-forward and fall-back transitions are applied automatically and the result is always correct for that moment.

Which time zones can I convert between?

You can convert between any two IANA time zones. When your browser supports it, the dropdowns are populated with the full list of supported zones; otherwise the tool falls back to about forty common zones covering the Americas, Europe, Africa, Asia, and Oceania.

What does the UTC offset shown next to the time mean?

The UTC offset, such as UTC+05:30 or UTC-08:00, tells you how far the target zone is ahead of or behind Coordinated Universal Time on the selected date. Because offsets change with daylight saving, the value reflects the exact date you picked, not a fixed number.

Why does the source zone default to my local time?

The tool reads your device's time zone using Intl.DateTimeFormat().resolvedOptions().timeZone and sets it as the default source zone. This makes the most common task, converting from where you are to somewhere else, quick, though you can change it at any time.

Is the conversion accurate for past and future dates?

Yes. The Intl engine applies the daylight saving and offset rules that were or will be in effect for the date you select, so historical and upcoming conversions are handled correctly, within the limits of the browser's time zone database.

Is my data sent to a server?

No. All conversions happen locally in your browser using JavaScript's Intl API. No date, time, or time zone selection is uploaded, logged, or stored, so the tool works offline once the page has loaded.