Time Zone Converter
UTC
09:28
Sunday
September 28, 2025
Europe/London
10:28 AM
Sunday
September 28, 2025
About this Tool
Never get confused by time zones again. The Time Zone Converter allows you to instantly see what time it will be in another part of the world. It is perfect for scheduling international meetings, planning travel, or coordinating with friends and family globally.
This tool leverages your browser's built-in Internationalization API (Intl) to perform accurate timezone conversions. It takes a specific date and time, treats it as being in the "From" timezone, and then calculates the equivalent date and time in the "To" timezone, accounting for complexities like Daylight Saving Time (DST).
- Select the date and time you want to convert using the input fields.
- Choose your starting timezone from the "From" dropdown and your target timezone from the "To" dropdown.
- The tool will instantly display the converted date and time for both locations in a clear, side-by-side view.
- The time difference in hours between the two zones is shown right below the selectors.
- Click the swap button between the dropdowns to quickly reverse the conversion.
- A project manager in New York can schedule a video call with a developer in Berlin by checking the corresponding work hours.
- A traveler can find out the local time of their arrival city before they land.
- Someone can wish their friend in another country a "Happy Birthday" at the right local time.
- Side-by-side display for easy comparison of two timezones.
- Calculates and shows the exact hour difference between the selected zones.
- Comprehensive, grouped list of IANA timezones for easy selection.
- Displays the converted day of the week, which is crucial for future or past dates.
- Real-time updates as you change the date, time, or timezones.
- A swap button to quickly invert the "From" and "To" locations.
The core of this tool is the `Intl.DateTimeFormat` object in JavaScript. By providing a specific IANA timezone name (e.g., "America/New_York" or "Europe/Paris"), we can format a single date object to display the correct local time for that zone. The tool creates a date object from your input and then uses formatters for both the "From" and "To" zones to display the results.
What are IANA timezones?
IANA (Internet Assigned Numbers Authority) timezones are standardized names like "America/New_York" that represent specific geographical regions. They are the most reliable way to handle timezones in software because they automatically account for local time rules and Daylight Saving Time changes.
Why is the day of the week different after conversion?
When you convert between timezones with a large hour difference, it's common for the time to cross over midnight, resulting in a different day. For example, 10 PM on Tuesday in Los Angeles is already 7 AM on Wednesday in Paris.
All calculations and data processing for this tool are performed locally in your browser. We do not send any of your data to our servers, ensuring your information remains private and secure.