Timezone Converter & World Clock
Compare multiple time zones side by side, find meeting times, and track daylight saving changes.
About This Tool
The Timezone Converter & World Clock lets you compare multiple time zones simultaneously in a clean table view. Whether you are scheduling a standup with a distributed team or checking business hours in another country, this tool makes cross-timezone coordination effortless.
All calculations are powered by the browser's native Intl.DateTimeFormat API and the IANA Time Zone Database. This means results are always accurate, including automatic handling of daylight saving time transitions. No external API calls are made — your queries stay entirely on your device.
The Meeting Planner feature highlights overlapping business hours (9 AM – 5 PM) across all selected zones, helping you pick the best slot for everyone. Need to convert a specific Unix timestamp instead? Try the <Link href={getLocalePath(locale, "/tools/timestamp-converter")} className="text-primary underline underline-offset-2"
Timestamp Converter . For batch conversions of multiple timestamps, use the <Link href={getLocalePath(locale, "/tools/timestamp-batch")} className="text-primary underline underline-offset-2"
Timestamp Batch Converter .
The tool starts with a sensible set of default zones (UTC, New York, London, Tokyo) and lets you search from over 50 major cities worldwide. All processing happens client-side — your timezone selections are never transmitted to any server. If you need to schedule recurring tasks, check out the <Link href={getLocalePath(locale, "/tools/cron-builder")} className="text-primary underline underline-offset-2"
Cron Expression Builder for visual cron schedule creation.
How to Use
- The default zones (UTC, New York, London, Tokyo) are shown automatically with live-updating times.
- Type a city or timezone name in the search box and click Add to add it to the comparison table.
- Click the trash icon next to any timezone to remove it from the list.
- In the Meeting Planner section, pick a date and time to see the equivalent time across all zones.
- Green-highlighted cells indicate times within business hours (9 AM – 5 PM local).
- Press Ctrl+Shift+C to copy all current times to your clipboard.
FAQ
Is my data safe?
Yes. All time calculations run in your browser using the built-in Intl.DateTimeFormat API. No data is sent to any server.
How does daylight saving time (DST) affect the results?
The tool uses the browser's native timezone database (IANA), which includes all DST transition rules. When a timezone is observing DST, the offset changes automatically and a DST indicator is shown.
How many time zones can I compare at once?
You can add as many time zones as you need. The table scrolls horizontally on smaller screens to accommodate all columns.
Can I use this to schedule meetings across time zones?
Yes. Use the Meeting Planner section to pick a date and time, and the tool will show the corresponding time in every added timezone. Business hours (9 AM - 5 PM) are highlighted so you can find overlap.
Does this tool work offline?
Yes. Since all calculations use the browser's built-in Intl API, the tool works without an internet connection after the page has loaded.
What timezone database does this use?
The tool relies on the IANA Time Zone Database bundled with your browser's JavaScript engine. This is the same database used by major operating systems and is updated regularly.
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