Time Zone Converter

Time Zone Converter

Accurate • No API
Last updated: March 18, 2026
Converted Time
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Relative Day
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e.g., “Next day” or “Previous day”
Offset Difference
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Δ between zones at selected time
World Clock Live • 24 cities
Times update automatically. Click a city to set it as “From” or “To”.

What Is a Time Zone Converter?

A time zone converter is an online tool that translates a specific date and time from one region's local clock to another. Whether you're scheduling a video call between New York and Tokyo, checking when a live stream starts in your city, or planning a flight layover, a converter removes the guesswork from crossing time zone boundaries.

Our free time zone converter supports all 400+ IANA time zones — from America/New_York and Europe/London to Asia/Kolkata and Pacific/Auckland. It automatically adjusts for Daylight Saving Time (DST) transitions, so you always see the correct offset for the exact date you select — not just a static number.

Unlike basic calculators that show a fixed UTC offset, this tool accounts for the fact that offsets change throughout the year. For example, New York is UTC−5 in winter (EST) but UTC−4 in summer (EDT), while London shifts from UTC+0 (GMT) to UTC+1 (BST). Our converter handles all of these shifts seamlessly using the same IANA time zone database trusted by operating systems, cloud platforms, and calendar apps worldwide.

How to Use the Converter

  • Choose your source city or time zone and set the date and time.
  • Add one or more destination cities to compare side by side.
  • Use the arrows to shift by hours or days to preview future schedules.
  • Copy times to share with your team, or screenshot the table for quick reference.

Tip: If you’re planning a meeting, try the Meeting Planner—it highlights overlapping working hours for multiple time zones.

Why Our Time Zone Conversions Are Accurate

Time zone rules are surprisingly complex. Governments change DST schedules, countries adopt new offsets, and some regions use non-standard half-hour or quarter-hour offsets (like India at UTC+5:30 or Nepal at UTC+5:45). A reliable converter must track all of these edge cases — and ours does.

We use the IANA Time Zone Database (also called the Olson database or tz database), which is maintained by a global community of contributors and adopted by Linux, macOS, Android, iOS, and every major cloud platform. When a government announces a rule change, it gets incorporated into the database and pushed to browsers through regular updates.

Our converter interprets your selected time as wall clock time in the source zone. It resolves the exact UTC instant that wall time represents — handling ambiguous times during fall-back and nonexistent times during spring-forward — then displays the result in your destination zone. This approach avoids the common pitfall of applying a static offset that ignores seasonal changes.

If you ever notice a discrepancy, try refreshing the page to pick up the latest browser timezone data. You can also report it and we will investigate.

What’s the difference between GMT, UTC, and local time?

UTC is the global reference standard. GMT is historically similar to UTC. Local time is UTC adjusted by a region’s time zone offset and DST rules.

Does the converter handle Daylight Saving Time automatically?

Yes. The results reflect current and future DST changes based on the date you select.

Why do I see different offsets at different times of the year?

Because some areas change clocks for DST while others don’t. Always set your meeting date to see the correct offset.

Can I compare more than two cities?

Absolutely. Add as many destinations as you need, then scan the table for overlapping hours.

How do I share a time with someone in another time zone?

Pick your date/time, add their city, then copy the table row or take a screenshot. You can also paste the exact UTC time to avoid confusion.

What time zone database do you use?

We use the IANA time zone database, which is the same standard used by most operating systems and cloud platforms.

Why does my city show multiple time zones?

Some countries span multiple zones. Select the specific region/city (e.g., America/Indiana rather than just 'Indiana') for precise results.

Is the World Clock live?

Yes. The clock reflects the current local time in each selected zone and adjusts automatically for DST changes.

Meeting Planner Overlap of working hours
Green = both 9:00–17:00, Yellow = one working, Red = neither.
Hour blocks (Zone A local day)
FAQ Clear answers
Do you use any external APIs?

No. Everything runs in your browser using the system’s IANA time zone database. This keeps it fast, private, and reliable.

Is daylight saving time handled correctly?

Yes. Conversions use the correct offset for the exact date and time you pick, including DST transitions.

Can I plan meetings across time zones?

Yes. Use the meeting planner to find overlapping 9–5 hours. You can adjust the zones to match your team.

How we handle DST transitions

The converter uses official IANA time zone rules, which include daylight saving adjustments. When a location enters or leaves DST, conversions automatically reflect the correct offset, including edge cases like skipped or repeated hours during clock changes.

Sources & Methodology DST‑aware

This tool converts time zones using the IANA time zone database rules (including daylight saving transitions) and the browser’s built‑in internationalization engine. No personal data is sent to a server.

Related reads: Daylight Saving Time • Abbreviations vs IANA IDs

Example use case

Scheduling a meeting between New York and London during the spring DST switch can be confusing. This tool ensures you see the correct time difference even when one region has changed clocks and the other has not yet.