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Unix timestamp converter

Understand machine timestamps. Simple, private, right in your browser.

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Save the inputs and settings you choose. Nothing is uploaded until you select Save.

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Choose a file explicitly. Your tool’s open files are never uploaded automatically. PDF, PNG, JPEG, WebP, TXT, CSV and JSON are supported.

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A LITTLE GUIDANCE

How to use this tool

  1. Choose timestamp-to-date or ISO-date-to-timestamp.
  2. Set seconds or milliseconds, or enter an ISO date with an explicit UTC offset.
  3. Calculate the UTC and selected-zone representations.

A worked example

0 seconds → 1970-01-01T00:00:00Z; 1000 milliseconds → 1970-01-01T00:00:01Z.

What to know

Timestamp zero is 1970-01-01T00:00:00Z. Seconds may include milliseconds as a fractional part. ISO input must include Z or an offset; sub-millisecond precision is rejected.

Supported inputs and limits

Whole-millisecond precision within the Temporal instant range.

Where is my data processed?

In your browser. Cloud saving is optional: only the supported inputs, settings or files you explicitly choose are uploaded. Download or save anything you want to keep before closing the page. Read our privacy details.

Further reading

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