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ToolWrenConvert any date and time from one time zone to another, and see a live world clock for major cities. Daylight saving is handled for you.
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Time Zone is a free, private online tool that lets you convert a time from one time zone to another and compare a live world clock across major cities. It runs entirely in your browser, so nothing you enter is uploaded to a server.
Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.
Pick a date and time, a source zone and a target zone, and the converter shows the matching local time in the target zone along with the exact hour difference. A live world clock below shows the current time in cities worldwide.
The converter uses your browser’s built-in time zone database, so it applies daylight saving time (DST) correctly for the specific date you choose — the offset in July can differ from January for the same city.
Scheduling international meetings, calls and webinars, planning travel, coordinating remote teams, catching live streams and knowing when markets open around the world.
A time zone converter takes a moment in time expressed in one place and tells you the equivalent local time somewhere else. Because different regions run their clocks at different offsets from Coordinated Universal Time (UTC) - and many shift by an hour for daylight saving in summer - working this out by hand is error-prone. This tool does it precisely, converting between any two zones and showing the exact hour difference, plus a live world clock for major cities.
Every time zone is defined as an offset from UTC, the global reference standard that never changes for daylight saving. London is UTC+0 in winter, New York is UTC-5, Tokyo is UTC+9, and India is UTC+5:30 (not all offsets are whole hours). To convert between two cities you find each one’s offset for the chosen date and apply the difference. UTC itself is the successor to GMT and is what servers, aviation and international standards use to avoid ambiguity.
Many countries move their clocks forward an hour in spring and back in autumn, but they do it on different dates, and some do not observe it at all. That means the difference between two cities is not constant: London and New York are usually five hours apart, but for a few weeks each year - when one has switched and the other has not - they are four or six. This converter uses your browser’s built-in IANA time zone database, so it applies the correct rule for the exact date you pick rather than assuming a fixed offset.
Getting a time zone wrong means missing a meeting, a flight, a market open or a live event. Remote teams, international clients, webinars and travel bookings all depend on converting times correctly. A one-hour daylight-saving slip is one of the most common scheduling mistakes, which is exactly the case a good converter is built to catch.
Enter the date and time, choose the zone it is in and the zone you want it in, and read the converted time and hour difference instantly - use Swap to reverse the direction, or Now to start from the current moment. The live world clock underneath shows the current time across major cities at a glance. Everything runs in your browser using local time zone data, so nothing you enter is uploaded, and it keeps working offline once the page has loaded.