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🕒 Timezone Converter & World Clock

Convert a datetime across multiple IANA timezones (400+) at once. Default view shows Tokyo, NY, LA, London, Paris, Sydney, Mumbai and Sao Paulo. DST handled automatically, UTC offsets shown, live ticking world clock.

✅ 100% free, no signup, runs entirely in your browser

🔒 About Privacy

City / Timezone Date Time UTC offset DST

📖 How to Use

  1. 1
    Choose a mode
    In "Current time" mode the world clock ticks every second. In "Convert specific datetime" mode the entered datetime is shown in each city local time.
  2. 2
    Add or remove cities
    Pick from 400+ IANA timezones to add cities. Use the X button to remove, or Reset to restore the default 8 cities.
  3. 3
    Check DST and UTC offset
    Each row shows the current UTC offset and whether DST is in effect. Useful for meeting scheduling and server log correlation.

❓ FAQ

What is an IANA timezone?
The IANA Time Zone Database (tz database) defines world timezones using identifiers like Asia/Tokyo and America/New_York. It is the standard used by Linux, macOS, Java, JavaScript and many other systems.
Is DST handled automatically?
Yes. We use the browser Intl.DateTimeFormat API, which applies each timezone DST start and end dates to compute the correct offset.
Is the datetime sent to your server?
No. All conversion and rendering happen entirely in browser JavaScript. No network requests are made.

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🐛 Found a bug or issue with this tool?

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* Browser info (UA / screen / language / URL) is sent automatically to help reproduce the issue