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Time Zone Converter

Convert times between 400+ time zones with automatic DST handling. 100% client-side, uses IANA database via Intl API.

UTCsource
UTC
12:06:54
Sun, Oct 11, 2026 · UTC+00:00
India (IST)
Asia/Kolkata
17:36:54
Sun, Oct 11, 2026 · UTC+05:30
New York
America/New_York
08:06:54
Sun, Oct 11, 2026 · UTC-04:00
London
Europe/London
13:06:54
Sun, Oct 11, 2026 · UTC+01:00
Tokyo
Asia/Tokyo
21:06:54
Sun, Oct 11, 2026 · UTC+09:00
Sydney
Australia/Sydney
23:06:54
Sun, Oct 11, 2026 · UTC+11:00
🔒 100% private: All conversions happen in your browser using the Intl API and the IANA time zone database. Automatic DST handling. No data sent to any server.

About Time Zone Converter

Time zone conversion is essential in a globally connected world: scheduling meetings across continents, coordinating with remote teams, planning travel, and understanding when to call a colleague in another country. Unlike fixed UTC offsets, real time zones follow political and historical rules — including daylight saving time (DST) — that change every year. The IANA time zone database (also called tzdata or zoneinfo) tracks all of these rules for over 400 zones worldwide. This tool uses the browser's Intl API to access that database, so conversions are always accurate — including current DST status — without a server or API key.

How It Works

  1. Enter a date and time (or use "Now").
  2. Choose the source time zone.
  3. See the converted time across all your added target zones.
  4. Add or remove zones to compare as many as you need.

✨ Key Features

  • ✓400+ IANA time zones
  • ✓Automatic daylight saving time (DST) handling
  • ✓Convert from any time zone to any other
  • ✓World clock view — see current time in multiple zones
  • ✓Add/remove zones dynamically
  • ✓Live clock updates every second
  • ✓UTC offset display
  • ✓12-hour and 24-hour formats
  • ✓Copy converted times
  • ✓Search zones by city or country
  • ✓100% client-side — uses browser's Intl API

🎯 Common Use Cases

  • →Scheduling meetings across international teams
  • →Finding a good time to call a colleague abroad
  • →Converting UTC timestamps to local time
  • →Planning travel itineraries
  • →Checking what time it is for a client in another country
  • →Coordinating live events (webinars, launches) globally
  • →Verifying DST transitions
  • →Building a personal world clock dashboard

💡 Advanced Tips & Pro Insights

  • ▸Time zones are identified by IANA names like "America/New_York", "Europe/London", "Asia/Kolkata". These are more reliable than abbreviations (like EST/PST) which are ambiguous.
  • ▸DST rules change frequently. The IANA database is updated several times per year as countries adjust their rules. Browsers update automatically.
  • ▸UTC is the reference time zone (offset 0). "GMT" (Greenwich Mean Time) is technically a time standard, not a time zone, but is often used interchangeably with UTC.
  • ▸India (Asia/Kolkata) uses IST with a +5:30 offset — a rare 30-minute offset. Nepal (Asia/Kathmandu) uses +5:45.
  • ▸Some zones have changed their names or offsets historically (e.g., Asia/Calcutta → Asia/Kolkata). Most browsers accept both.
  • ▸For scheduling, always specify both the date and time zone explicitly. "3 PM" without a time zone is ambiguous.

Frequently Asked Questions

Is this Time Zone Converter free?▾
Yes, this time zone converter is completely free with no signup, email, or usage limits.
Is my data safe?▾
Yes, 100% safe. All conversion happens in your browser using the built-in Intl API. Nothing is sent to any server.
Does it handle daylight saving time (DST)?▾
Yes. This tool uses the IANA time zone database via the browser's Intl API, which includes current DST rules. All conversions automatically account for DST transitions.
What is the difference between UTC and GMT?▾
UTC (Coordinated Universal Time) is the modern time standard used by computers and the internet. GMT (Greenwich Mean Time) is an older astronomical time standard. In practice, they refer to the same time, but "UTC" is preferred in technical contexts.
Why do time zones have names like "America/New_York"?▾
These are IANA time zone names (from the tz database). They are unambiguous and include the continent and city. Abbreviations like "EST" or "PST" are ambiguous — "CST" could mean Central Standard Time (US), China Standard Time, or Cuba Standard Time.
Why does India have a 30-minute offset (IST = UTC+5:30)?▾
India spans a wide geographic area but uses a single time zone, IST (Indian Standard Time), with a +5:30 offset to split the difference. This was adopted in 1947 to unify the country under one time. Nepal uses +5:45 for similar reasons.
How do I schedule a meeting across many time zones?▾
Add all the relevant zones to the tool, then adjust the date and time until everyone's working hours overlap. Or start with a target time in one zone and see the corresponding times in all the others.
Are the conversions accurate to the second?▾
Yes — Intl.DateTimeFormat uses the browser's full time zone database. There can be a small delay in live clock updates (up to 1 second), but conversions are exact.