Enter seconds, milliseconds, microseconds, or nanoseconds since the Unix epoch.
Convert Unix timestamps to readable dates and dates to Unix time in your browser.
Both directions resolve to the same instant, so every format is listed at once — Unix seconds and milliseconds alongside local time, UTC, ISO 8601, and RFC 2822. Add extra timezones, batch-convert a whole list at once with CSV export, or grab a ready-to-paste code snippet. Relative time is measured against your device clock and updates every second.
Seconds-based timestamps have 10 digits for current dates (e.g. 1735689600); milliseconds have 13, microseconds 16, nanoseconds 19. Leave the unit on Auto and this tool detects which one you pasted from its magnitude.
Systems storing Unix time as a signed 32-bit integer overflow on January 19, 2038. Most modern systems use 64-bit timestamps, which avoids this.
A timestamp identifies a single instant with no timezone attached — it's rendered into local time only at display. That's what makes it reliable for comparing events across servers in different regions.
Epoch time is a number of seconds since 1970-01-01 UTC. ISO 8601 (e.g. 2026-08-17T00:00:00Z) is a human-readable date-time string.
Yes — enter a negative number and it resolves to a date before January 1, 1970 normally.
No — conversion runs entirely in your browser.