Epoch / Unix Timestamp Converter
Convert Unix timestamps (seconds or milliseconds) to human-readable UTC dates and back.
Runs in your browser — files never leave your device
ISO 8601 (UTC)
2021-01-01T00:00:00.000Z
UTC string
Fri, 01 Jan 2021 00:00:00 GMT
How it works
Enter a Unix timestamp to see the equivalent UTC date in ISO and human-readable form.
All conversion is local and matches the ZoolTools app.
Frequently asked questions
- Seconds or milliseconds?
- Both — pick the unit. Unix timestamps are usually in seconds; JavaScript uses milliseconds.
- Which timezone is shown?
- UTC, for an unambiguous, stable result.
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