Unix Timestamp Converter

Convert Unix epoch timestamps in seconds, milliseconds, microseconds or nanoseconds to human-readable dates, and dates back to epochs. Shows ISO 8601, UTC, local time and relative time.

Runs locally · nothing uploaded

The Unix Timestamp Converter runs entirely in your browser, so it needs JavaScript. Turn JavaScript on to use it; the guide and FAQs below are available either way.

How to use the Unix Timestamp Converter

1
Enter an epoch number or a date. The unit (seconds, ms, µs or ns) is detected from its size.
2
Read the ISO 8601, UTC, local and relative times.
3
Copy the current Unix time, or press Use to convert it.

What happens to your data

Conversion uses your browser's Date and Intl APIs. Nothing is sent anywhere.

Frequently asked questions

Seconds or milliseconds?

Unix time is usually seconds (10 digits today); JavaScript uses milliseconds (13 digits). The converter detects which one you entered.

Which date formats can I enter?

ISO 8601 such as 2026-01-01T00:00:00Z, RFC 2822, and other formats your browser's Date parser understands.