Z

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.

AI Summary

Timezone Converter is a free developer utility by Zerethon Tools. Convert any date and time between IANA timezones. DST-aware, shareable, runs entirely in your browser. Runs entirely in the browser — no signup, no upload.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

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