Unix Timestamp Converter – Epoch to Date & Back

The number of seconds elapsed since January 1, 1970 00:00:00 UTC (the Unix epoch). It's the universal way to represent dates in programming.

Unix time counts seconds since 1 January 1970 UTC. JavaScript's Date.now() returns milliseconds instead, so its values have 13 digits. Python's time.time() and the shell command date +%s return seconds.

In JavaScript use Math.floor(Date.now() / 1000). In Python use int(time.time()). In a Linux or macOS terminal run date +%s.

Systems that store Unix time in a signed 32-bit integer overflow at 03:14:07 UTC on 19 January 2038. Modern systems use 64-bit values, which avoids the problem.

Yes. Negative values represent dates before 1 January 1970 UTC.

Paste the number into the Unix Timestamp Converter. A 10-digit value is read as seconds and a 13-digit value as milliseconds, then shown as a readable date in the timezone you choose, plus the ISO 8601 form.