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Developer utility

Unix Timestamp Converter

Convert Unix seconds or milliseconds into ISO 8601, UTC, local time, and a relative description.

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Local processing

All date conversion uses this device. The page sends no timestamp request.

Unix seconds—
Unix milliseconds—
ISO 8601—
UTC—
Local date and time—
Relative to now—
convert a local date to Unix time

A date without an offset is interpreted in your browser's local timezone.

How to use it

  1. Paste a whole-number Unix value.
  2. Use automatic detection or choose the unit explicitly.
  3. Check UTC and local output before storing or comparing dates.

Seconds or milliseconds?

Current Unix seconds normally contain 10 digits; milliseconds normally contain 13. Explicit units are safest for historical and far-future dates.