🌍 Time Zone Converter

Convert any time between the world's major time zones.

CURRENT TIME IN SELECTED ZONES

The Time Zone Converter lets you convert any time from your local time zone to any city in the world. Select a time and source zone, then add destination cities to see the converted times side by side — perfect for scheduling international meetings or tracking world markets.

How to use the time zone converter

Set the source time and the source city in the top row — by default it pre-fills with your computer's current time and detected zone. Add destination cities from the dropdown; each is added as a row showing what your chosen source time becomes locally there. Add as many cities as you need for a global team meeting. Toggle the 12/24-hour format with the small switch. The "current time in selected zones" panel below ticks live, useful for "is it a sensible hour to call them?" checks.

How time zone math works

Every zone is defined as an offset from UTC. London winter is UTC+0; New York is UTC-5; Tokyo is UTC+9; Sydney is UTC+10 or +11 depending on the season. To convert, the tool turns your input into a UTC instant, then formats that instant in each destination zone using the browser's Intl.DateTimeFormat with a named IANA zone (like Europe/London). IANA zones encode the full DST history, so when daylight saving rules change, the converter is correct without you having to think about it.

Frequently Asked Questions

What is UTC / GMT?
UTC (Coordinated Universal Time) is the world's primary time standard. GMT (Greenwich Mean Time) is essentially the same. All time zones are defined as an offset from UTC — for example, New York is UTC-5 in winter and UTC-4 in summer.
What is daylight saving time?
Daylight Saving Time (DST) is when clocks are moved forward 1 hour in spring and back 1 hour in autumn to extend evening daylight. This converter uses your browser's time zone data which handles DST automatically.
How many time zones are there?
There are 24 standard time zones (based on every 15° of longitude) but in practice over 38 unique offsets are used globally, including half-hour and quarter-hour offsets like India (UTC+5:30) and Nepal (UTC+5:45).
Why does the converted time look an hour off?
DST starts and ends on different dates in different countries. Around late March or early November the gap between, say, London and New York can briefly be 4 hours instead of the usual 5. The tool handles this automatically — what looks "off" is usually correct.
Can I find a meeting time that works for three zones?
Yes — slide the source time around until each destination row shows a sensible local hour for that team. Mid-morning UTC tends to be the most universally workable slot.

Common uses

Scheduling cross-border calls, picking a livestream slot that works in multiple regions, planning international travel arrival times, tracking financial market opens (London 8 AM, New York 9:30 AM, Tokyo 9 AM local), or just figuring out whether a friend overseas is awake before you message them.

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