Unix Timestamp Converter Online — Epoch ↔ Date
Live Unix time, bidirectional epoch ↔ date convert (including local datetime), and a copy-ready format matrix (ISO, RFC 2822, SQL, relative). UTC or browser local — all in your browser, no upload.
How conversion works
After load, empty fields follow the live clock in the format matrix. Type an epoch, ISO date, or local datetime and the other fields update live (no Convert click required). Formats include epoch s/ms, ISO 8601, RFC 2822 (English tokens), SQL-like datetime, locale string, and relative time. Clear returns to live-now. Precision beyond milliseconds (e.g. 16+ digit under auto) is rejected — JavaScript Date is ms-only.
Options
Examples
Epoch seconds → ISO (UTC)
Input
Output
ISO date → epoch
Input
Output
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Need identifiers for fixtures? Use the UUID generator. Scheduling jobs? Check next runs with the cron parser. Number bases? Try the number base converter.
Unix timestamp FAQ
Epoch conversion questions
How does auto unit detection work?
About 10 absolute digits → seconds; 11–15 → milliseconds. Sixteen or more digits under Auto are rejected (too precise for Date). Force Milliseconds to treat a 10-digit value as ms instead of seconds.
Is my data uploaded?
No. Conversion runs entirely in your browser.
Do I need to click Convert?
No. Epoch, ISO text, and local datetime stay in sync as you type (light debounce). Clear restores the live-now matrix.
UTC vs local — and what about Local date/time?
Prefer UTC for logs and APIs. Display timezone switches the format matrix. The Local date/time control always edits browser wall clock for that Instant — it is never labeled as UTC.
Can I convert microseconds or nanoseconds?
No. JavaScript Date is millisecond precision; values that look like µs/ns under Auto are rejected rather than silently truncated.
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