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Timezone Converter — Free Online World Clock & Meeting Planner

Convert any date and time between IANA timezones. DST-aware, shareable, runs entirely in your browser.

Free No signup Client-side Privacy friendly Updated

Source

UTC:

Converted

  • No matches.
  • No target timezones. Click Add timezone to start.

How to use

  1. 1 Pick the source timezone, date, and time you want to convert from.
  2. 2 Click "Add timezone" to add target zones — search by city or region name.
  3. 3 Each row shows the equivalent local time, UTC offset, and difference from the source.
  4. 4 Click the copy icon to copy a single row, or "Copy link" to share the whole conversion.

Why use this tool

  • IANA timezone database via your browser — covers all named zones, including DST transitions and historical offsets.
  • Saves your target zone list locally — your meeting roster sticks around between sessions.
  • Shareable URLs encode the source instant and target list — perfect for "what time is this for everyone" messages.
  • Pure client-side — no server roundtrip, no tracking of your schedule.

Frequently asked questions

Does it handle daylight saving time?

Yes. The browser's built-in IANA timezone data drives every conversion, so DST start/end transitions, half-hour offsets (India, Nepal), and 45-minute zones (Nepal, Chatham) are all correct for the specific instant being converted.

What if my chosen time falls inside a DST "spring forward" gap?

That local time technically does not exist. The converter resolves it to the nearest valid UTC instant, so you will see a result — but be aware the wall clock skipped that hour locally.

Can I share a converted time with someone?

Yes — click "Copy link". The URL encodes your source zone, date, time, and target list, so the recipient lands on the same conversion you saw.

Is the timezone list complete?

On modern browsers (Chrome 99+, Firefox 93+, Safari 15.4+) the list uses Intl.supportedValuesOf and includes every IANA zone — typically around 400 entries. Older browsers fall back to a 22-zone shortlist of common ones.

Does this work offline?

Yes after the first load. All conversion runs in your browser using built-in Intl APIs — no API call, no server dependency.

What is Timezone Converter?

A Timezone Converter is a tool that maps a date and time in one IANA timezone (for example, "America/New_York") to its equivalent moment in another (for example, "Asia/Tokyo"). DST-aware converters apply the correct offset for the chosen day, including the spring-forward and fall-back transitions. Multi-city comparison lets meeting planners see one moment across every participant's wall clock.

Features

IANA + DST-aware

Uses the IANA time-zone database, so offsets and daylight-saving transitions are correct for each date.

Multi-city planner

Compare one moment across several cities at once to schedule cross-region meetings.

Shareable links

Every conversion encodes to a URL you can paste into a calendar invite or chat.

Example

Input

2026-03-15 09:00  America/New_York (EDT, UTC−4)

Output

2026-03-15 22:00  Asia/Tokyo (JST, UTC+9)   — 13 hours ahead

Common use cases

  1. 1

    Schedule a global meeting

    Find a time that works across New York, London, and Tokyo without manual offset math.

  2. 2

    Convert a deadline

    Translate a "5 PM PT" submission cutoff into your own local time, DST included.

  3. 3

    Plan travel & calls

    See what time it will be at your destination when you land or dial in.

How Timezone Converter compares to alternatives

Timezone Converter versus typical browser and desktop alternatives — features compared at a glance.
Feature Zerethon Tools Typical online tools Desktop apps
IANA timezone database Yes Sometimes Yes
DST transitions handled Yes Sometimes Yes
Multi-city comparison Yes Rarely Sometimes
Shareable URLs Yes Rarely No
Runs offline Yes (after load) No Yes
Free Yes Yes Often free
Summary

Zerethon's timezone converter maps a date and time in one IANA timezone (e.g. "America/New_York") to its equivalent moment in another (e.g. "Asia/Tokyo"), in your browser. It is DST-aware — the correct offset is applied for the chosen day, including spring-forward and fall-back transitions — and multi-city comparison shows one moment across every participant's wall clock.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. Timezone Converter runs entirely client-side — no server upload, no logging, no tracking of your input.

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