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Time-Zone Converter

Convert a stated local date and time between named world time zones.

Time

Friendly Windows-style names are shown for readability. Conversions still use the matching IANA time zone and its daylight-saving rules.

ResultMonday, 20 July 2026 at 4:00:00 AM EDT (UTC-04:00)The destination time reflects the selected date and applicable daylight-saving rules.Daylight-saving time is active on this date: Dublin, Edinburgh, Lisbon, London is UTC+01:00 instead of its standard UTC+00:00; Eastern Time (US & Canada) is UTC-04:00 instead of its standard UTC-05:00.

Calculations happen locally in your browser.

How to use this calculator

  1. Choose a familiar Windows-style UTC label for the source and destination, then enter the local source date and time. The matching IANA identifier remains in use behind the label.
  2. Review the live result and use Copy result when you need to share it.

How the calculation works

The converter asks the built-in Intl time-zone database for the applicable offset, including daylight-saving rules. Nonexistent spring-forward times are rejected.

Formula

The converter asks the built-in Intl time-zone database for the applicable offset, including daylight-saving rules. Nonexistent spring-forward times are rejected.

Step-by-step calculation

  1. Choose a familiar Windows-style UTC label for the source and destination, then enter the local source date and time. The matching IANA identifier remains in use behind the label.
  2. The converter asks the built-in Intl time-zone database for the applicable offset, including daylight-saving rules. Nonexistent spring-forward times are rejected.
  3. Check the displayed result, then copy it if needed.

Worked example

9:00 AM in Dublin on 20 July 2026 converts to 4:00 AM in New York.

Risk guidance

Frequently asked questions

Does this tool send my inputs anywhere?

No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.

How should I use the result?

Check that the entered units and values match your situation, especially around dates, breaks, and rounding.

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