Timestamp

Convert Unix timestamps and dates.

A free Unix timestamp converter between timestamps and dates, with multi-timezone display, ISO 8601 / RFC formats and date arithmetic. All calculations run locally in your browser.

How to use

1. Enter a Unix timestamp (seconds or milliseconds) or a date string; click Now to insert the current time.
2. Pick a time zone to see the matching local time.
3. Use the day/hour/minute buttons under Date math to add or subtract.
4. Copy any format from the result — Unix (s/ms), ISO 8601, UTC and more.

FAQ

Does it tell seconds from milliseconds automatically?

Yes. A 10-digit number is parsed as seconds and a 13-digit one as milliseconds; you can also paste a date string directly.

Does it handle time zones?

Yes. You can display the time in Local, UTC and several common zones such as New York, London, Shanghai and Tokyo.

Does it need internet, and is my data safe?

No network is needed for the math — it all happens locally in the browser, and the values you enter are never uploaded.

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