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Text utilities

Unix Timestamp Converter

Convert Unix seconds or milliseconds to an exact UTC date and time.

Text stays in your browserCopy your result

Input workspace

Runs on your device

OUTPUT WORKSPACE

Your result

Let’s calculate.

Use the Calculate button to see your result.

Your content is processed locally.

How to use this tool

  1. Enter unix timestamp, timestamp unit.
  2. Select Update result to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Convert seconds to milliseconds if needed, then format the date in ISO 8601 UTC.

A WORKED EXAMPLE

Timestamp 0 corresponds to 1970-01-01T00:00:00.000Z.

What to keep in mind

Unix time does not encode a time zone and does not count leap seconds. Values outside the JavaScript date range are rejected.

Common questions

How does this tool handle my input?

Processing happens in your browser. Your pasted content is not uploaded, included in URLs or stored as a calculation history.

What input should I use?

Unix timestamp: use the example already shown, then replace it with your own content. Unix time does not encode a time zone and does not count leap seconds. Values outside the JavaScript date range are rejected.

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