Unix Timestamp Converter
Epoch seconds and milliseconds to readable dates.
Unix Timestamp Converter turns epoch seconds, milliseconds, microseconds or nanoseconds into a readable date in your local zone and in UTC, and converts a date back into a timestamp. It detects the unit from the magnitude and shows the current epoch time ticking live. All the conversion happens in your browser.
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Runs entirely on your device. No file or text you enter here is uploaded. How to verify it.
How to use Unix Timestamp Converter
- Paste a timestamp in any unit, or pick a date.
- Read the conversion in local time, UTC and ISO 8601.
- Copy the format you need.
Questions about Unix Timestamp Converter
Seconds or milliseconds?
Detected from the magnitude: a ten-digit number is seconds, thirteen digits is milliseconds, sixteen is microseconds. Unix time is defined in seconds; JavaScript, Java and JSON APIs commonly use milliseconds, which is the source of most off-by-1000 bugs.
What is the year 2038 problem?
A signed 32-bit timestamp overflows on 19 January 2038 and wraps to 1901. Anything storing epoch seconds in a 32-bit integer breaks then. The tool warns when a timestamp is near that boundary.
Does it handle negative timestamps?
Yes — dates before 1970 are negative epoch values, and they convert correctly rather than producing an invalid date.
Which time zone does it use?
Your device's zone for the local reading, with UTC and ISO 8601 alongside so there is no ambiguity. The zone comes from the browser rather than a lookup, which is why it stays correct offline.
Can I convert a whole column of timestamps at once?
No — it takes one value at a time, and is built for inspecting that value closely. For a column, a spreadsheet formula or a short script is the better instrument.
Is Unix Timestamp Converter really free, with no limits?
Yes. There is no account, no daily cap, no file-size tier and no watermark, because there is no server cost to recover. The site is funded by clearly disclosed partner recommendations on the Partners page, never by metering the tools.
Are my files or text uploaded when I use Unix Timestamp Converter?
No. Everything is processed by JavaScript running in your browser, on your device. You can verify it: open your browser's developer tools, switch to the Network tab, and use the tool. You will see no request carrying your data — because there is nowhere for it to go.