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Convert a Unix Timestamp to a Readable Date

Convert a Unix timestamp to a readable date and back, in your timezone or UTC.

Most tools run entirely on your device

Current time

All conversion runs in your browser.

About converting timestamps

Unix timestamps — a count of seconds (or milliseconds) since January 1, 1970 — are how most systems store dates internally, but they're meaningless to read at a glance. This tool converts between a Unix timestamp and a human-readable date and time, in either direction.

Conversion uses your browser's built-in JavaScript Date handling, respecting your local timezone (with a toggle for UTC) — entirely client-side, so there's no lag waiting on a server round trip for something this simple.

Supported files

No file — enter a timestamp or a date. Produces the converted value in the other direction, instantly.

Is my file uploaded?

Yes, completely private. Conversion happens entirely in your browser.

How to use the Timestamp Converter

  1. 1

    Enter a value

    Type a Unix timestamp to get a date, or a date to get a timestamp.

  2. 2

    Read the conversions

    See it in seconds, milliseconds, ISO 8601, UTC, your local time, and relative.

  3. 3

    Use it

    Copy whichever format your code or system needs.

Timestamp Converter — frequently asked questions

Does it accept seconds or milliseconds?+

Both — it detects which based on the magnitude of the number.

What timezone is 'local'?+

Your device's timezone. UTC and ISO are also shown.

Is there a free Unix timestamp converter online?+

Yes — this tool converts the timestamp entirely in your browser, free and with nothing uploaded.

Is my data sent anywhere?+

No — conversion uses your browser's own JavaScript Date handling; nothing is sent to a server.

Do you upload my files to a server?+

No — every tool here processes your files entirely on your device, and nothing is uploaded to a server. The only exception is the AI tools, which send the extracted text (not the file) to Claude to do their work.

Is there a file size limit?+

There's no artificial limit we impose, but since processing happens in your browser, very large files (500+ MB or 1,000+ pages) are limited by your device's memory rather than by us.