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Date & time

Time Zone Converter

Convert an exact timestamp to another time zone, including the daylight-saving offset for that instant.

Date conventions explained belowClear start and end values
Date workspace
Date workspace

Check which endpoints and calendar conventions are included.

See the method

Choose your dates and times

Runs on your device

Your time calculation

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter source timestamp with utc offset, destination iana time zone.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

An explicit UTC offset identifies one instant. The browser’s time-zone database formats that instant in the selected IANA zone, applying its date-specific daylight-saving rules.

A WORKED EXAMPLE

Using source timestamp with utc offset = 2026-09-21T14:00:00Z, destination iana time zone = America/New_York, the result is Monday, 21 September 2026 at 10:00:00 GMT-4. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

A local time can occur twice or not occur at all when clocks change. An explicit offset such as Z or −04:00 identifies one instant without guessing.

What to keep in mind

Uses your browser’s time-zone database. Historical rules may differ between browser versions; no ambiguous local time without an offset is accepted.

Common questions

Why does the source require an offset?

A local time can occur twice or not occur at all when clocks change. An explicit offset such as Z or −04:00 identifies one instant without guessing.

Where do I get a zone name?

Use IANA names such as Europe/London, America/Los_Angeles or Asia/Tokyo. A label like EST alone may be ambiguous.

Methodology maintained by ClarityKit. How these tools are built and checked.