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Time Zone Converter

Convert any date and time between world time zones, fully DST-aware.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Enter the date and time exactly as it reads on a clock in your source zone, then choose that zone under From zone.
  2. 2.Add one or more target zones from the chips, or use the defaults spanning Europe, Asia, and beyond.
  3. 3.Read the converted local time, date, weekday, and UTC offset for each target — or click Use current time to start from right now.

About Time Zone Converter

The Time Zone Converter turns a single date and time in one part of the world into its exact equivalent everywhere else. Type the moment as it reads on a clock in your source zone, choose that source zone, and add one or more target zones. For each target you instantly get the local time, the calendar date, the weekday, and the current UTC offset — so you can tell at a glance not just what hour it is, but whether the day has rolled over and whether daylight saving time is in effect.

The hard part of time-zone math is daylight saving time (DST), and this tool handles it correctly. A wall-clock time like 12:00 does not correspond to a fixed UTC instant: New York is UTC-5 in January (EST) but UTC-4 in July (EDT), and Europe, Australia, and dozens of other regions shift on their own schedules. Naive converters that assume a constant offset silently produce times that are an hour wrong for months of the year. This converter resolves the real UTC instant for your source wall-clock time using the browser's own IANA time-zone database, then re-derives each target zone's offset at that exact instant. That means January and July give different offsets automatically, and the answer is right on both sides of every DST transition.

Under the hood it uses the standard offset technique built on the JavaScript Intl API. To find a zone's offset at a given instant it formats that instant into the zone's wall-clock reading and measures the gap back to UTC. To go the other way — from a wall-clock time in a source zone to a true UTC instant — it makes an initial guess, checks the zone's offset there, corrects once, and re-checks at the corrected instant so that conversions land correctly even right at a spring-forward or fall-back boundary. Every conversion is validated against golden test values for summer and winter, so you can trust the output.

The converter is built for real scheduling: planning a call with colleagues in Paris, Tokyo, and Kolkata; picking a webinar slot that works across the US, Europe, and Australia; or checking when a deadline expressed in one country's local time actually falls in yours. A one-click "Use current time" button drops in the present moment from your own device so you can answer "what time is it there right now?" instantly. Roughly thirty major IANA zones spanning every continent are ready to pick from, each labeled with its city and standard/daylight abbreviations.

Everything runs entirely in your browser. There is no server, no upload, and no network request — your dates and zones never leave your device, and the tool works offline once the page has loaded. It is pure JavaScript built on the standard Intl date-and-time engine, so it is fast, private, and dependency-free. Whether you are coordinating a global team, booking travel across the international date line, or just settling a debate about what tomorrow looks like on the other side of the planet, this converter gives you an accurate, DST-correct answer in a fraction of a second.

Frequently asked questions

Does it handle daylight saving time correctly?
Yes. It resolves your source wall-clock time to a real UTC instant using the browser's IANA time-zone data, then re-derives each target zone's offset at that exact instant. So the same 12:00 in New York converts differently in January (EST, UTC-5) than in July (EDT, UTC-4), and results are correct on both sides of every DST transition.
Which time zones can I convert between?
Around thirty major IANA zones across every continent, including New York, Los Angeles, London, Paris, Berlin, Dubai, Kolkata, Bangkok, Singapore, Shanghai, Tokyo, Sydney, Auckland, and UTC. Each is labeled with its city and standard/daylight abbreviation so you can pick the right one quickly.
Is my data private?
Completely. The converter runs entirely in your browser using the built-in Intl date engine — pure JavaScript with no external dependencies. Nothing is uploaded, no network request is made, and it works offline once loaded. Your dates and zone choices never leave your device.

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