Time Zone Converter — Convert Time Between Any Zone, Free
Convert any date and time between world time zones instantly. Uses your browser's built-in Intl timezone database, which includes daylight-saving rules for all regions. Runs in your browser: no upload, no account, no logs.
How to use this tool
- Select the source timezone and enter a time.
- Select the target timezone.
- Read the converted time.
Pick a date and time to see it across all time zones.
About Time Zone Converter
The time zone converter takes a single date and time in one zone and instantly shows the equivalent local time in every supported zone at once. You choose a source zone, pick a date, and set a 24-hour time, and the tool lists all the zones with each one's matching wall-clock time, formatted in a readable style such as a weekday, day, month, and time. The source zone is highlighted so you can see your starting point at a glance.
It covers eleven zones spanning the major business hubs: UTC, America/Los_Angeles, America/New_York, Europe/London, Europe/Berlin, Europe/Lisbon, Asia/Dubai, Asia/Kolkata, Asia/Singapore, Asia/Tokyo, and Australia/Sydney. All of the offset and daylight-saving logic comes from your browser's built-in Intl date and time API rather than a hand-maintained table. That matters because the Intl time zone database knows the historical and current rules for when each region springs forward or falls back, so a conversion for a July date and a January date will reflect the correct summer or winter offset for each zone independently.
The conversion happens in two steps. The wall-clock time you enter in the source zone is first turned into a single absolute instant in UTC, accounting for that zone's offset on the chosen date. That instant is then formatted in each target zone using the Intl formatter, which applies each zone's offset for that same moment. This is the reliable way to convert across daylight-saving boundaries, because the tool reasons about one fixed point in time rather than naively adding or subtracting hours.
The main practical use is scheduling: lining up a call, a webinar, a release window, or a deadline across teams in different countries. A few constraints apply. Only the eleven listed zones are available, so you cannot add an arbitrary city or a custom fixed offset. The accuracy of daylight-saving handling depends on how up to date your browser's bundled zone data is, which is almost always current on a modern browser. The tool also corrects a quirk on some platforms where midnight can be reported as hour 24 rather than 0. Everything is computed locally, so the date and time you enter are never sent off your device.
Frequently Asked Questions
- Which time zones can I convert between?
- Eleven zones are supported: UTC, Los Angeles, New York, London, Berlin, Lisbon, Dubai, Kolkata, Singapore, Tokyo, and Sydney. You pick one as the source and the tool shows the matching time in all of the others simultaneously, with the source zone marked so you do not lose track of it.
- How does it know each zone's offset?
- It relies on your browser's built-in Intl time zone database, the same data your operating system uses for clocks and calendars. That database includes daylight-saving rules for every region, so the converter does not depend on any hand-maintained offset table and stays correct as the seasons change.
- Does it handle daylight saving time?
- Yes. The offset for each zone is computed for the specific date you enter, not a fixed annual value. A meeting set in July and the same meeting set in January can therefore show different offsets for the same pair of cities, because summer and winter time are applied per date automatically.
- How does the conversion work internally?
- The time you type is treated as a wall-clock time in the source zone and converted to a single absolute instant in UTC. That one instant is then re-formatted in each target zone. Reasoning about a fixed point in time, rather than adding or subtracting hours by hand, is what makes conversions across daylight-saving boundaries reliable.
- Can I add a city or custom offset that is not listed?
- No. The converter uses a fixed set of eleven preset zones and does not let you enter an arbitrary location or a custom fixed UTC offset. The presets are chosen to cover the major global business regions, which usually serves most cross-team scheduling needs.
- Could the offsets ever be wrong?
- The conversions are only as current as the time zone data shipped with your browser. On an up-to-date modern browser this is reliable, but a very outdated browser could carry stale daylight-saving rules for a region that recently changed its policy. Keeping your browser current avoids this entirely.
- Is my entered time sent to a server?
- No. The conversion runs entirely in your browser using the built-in Intl API, so the date and time you enter never leave your device and no network request is made to produce the results.
Embed this tool on your site
Free. One line of HTML — the tool runs in your visitor's browser, no data sent to anyone.
<iframe src="https://brevio.pro/embed/timezone-converter" width="100%" height="600" loading="lazy" style="border:1px solid #e5e5e5;border-radius:8px" title="Time Zone Converter — brevio"></iframe> <p style="font:12px/1.4 sans-serif"><a href="https://brevio.pro/tools/timezone-converter">Time Zone Converter</a> by <a href="https://brevio.pro">brevio</a></p>