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World Time Zone Converter

Convert the time and date from one city or timezone to another.

World Time Zones: A Practical Guide

Use this World Time Zone Converter to quickly find the time difference between cities, adjust for Daylight Saving Time (DST), and plan global meetings. This guide explains UTC vs GMT, why some countries use half-hour offsets, and how to convert times accurately.

How to Use the Converter

  1. Enter a time in the Time (HH:MM) field.
  2. Select the From Time Zone (your source zone).
  3. Choose the To Time Zone (your target zone).
  4. Click Convert Time to see the local time with the correct offset and DST applied.

What Is a Time Zone?

A time zone is a region that observes a uniform standard time for legal, commercial, and social purposes. Time zones are typically defined as offsets from Coordinated Universal Time (UTC), such as UTC−05:00 or UTC+09:00.

UTC vs GMT

UTC (Coordinated Universal Time) is the modern time standard used for global coordination and does not observe DST. GMT (Greenwich Mean Time) is a historical term; in casual use it often matches UTC, but UTC is the official, precise reference.

Daylight Saving Time (DST)

Many regions move clocks forward by one hour in warmer months to extend evening daylight. Our converter uses the browser’s Intl.DateTimeFormat with the IANA database to automatically account for DST rules and historical changes.

Quick Examples

  • 09:00 in America/New_York → what time is it in Europe/London today?
  • 14:30 in Asia/Tokyo → convert to Australia/Sydney accounting for DST.
  • Your local zone (Detected automatically) → UTC for logging or server operations.

Common UTC Offsets

  • UTC−08:00 — America/Los_Angeles (Pacific Time)
  • UTC−05:00 — America/New_York (Eastern Time)
  • UTC±00:00 — Europe/London (may observe BST in summer)
  • UTC+01:00 — Europe/Paris (Central European Time)
  • UTC+05:30 — Asia/Kolkata (half-hour offset)
  • UTC+09:00 — Asia/Tokyo (Japan Standard Time)
  • UTC+10:00 — Australia/Sydney (AEST/AEDT seasonally)

Scheduling Tips for Global Teams

  • Prefer UTC when sharing times in documentation and tools.
  • Specify the time zone name (e.g., America/New_York) instead of ambiguous labels like “PST.”
  • Avoid daylight saving changeover weeks when possible.
  • Use 24-hour time to prevent AM/PM confusion.

FAQ

Why do some places use 30- or 45-minute offsets? Time zones are set by local governments; several regions choose half-hour (e.g., UTC+05:30) or 45-minute offsets for historical or practical reasons.

Does this tool handle DST? Yes. It relies on the IANA time zone database via the browser’s internationalization APIs.

What does UTC± mean? It’s the difference in hours and minutes from Coordinated Universal Time, the global reference standard.

Related Tools

Date Difference Calculator

Day of the Week Calculator

Working Days / Business Days Calculator

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World Time Zone Converter

Convert the time and date from one city or timezone to another.

How to use World Time Zone Converter

Step-by-step guide to using the World Time Zone Converter:

  1. Enter your values. Input the required values in the calculator form
  2. Calculate. The calculator will automatically compute and display your results
  3. Review results. Review the calculated results and any additional information provided

Frequently asked questions

How do I use the World Time Zone Converter?

Simply enter your values in the input fields and the calculator will automatically compute the results. The World Time Zone Converter is designed to be user-friendly and provide instant calculations.

Is the World Time Zone Converter free to use?

Yes, the World Time Zone Converter is completely free to use. No registration or payment is required.

Can I use this calculator on mobile devices?

Yes, the World Time Zone Converter is fully responsive and works perfectly on mobile phones, tablets, and desktop computers.

Are the results from World Time Zone Converter accurate?

Yes, our calculators use standard formulas and are regularly tested for accuracy. However, results should be used for informational purposes and not as a substitute for professional advice.