Convert Unix timestamp to date
Paste one or more Unix timestamps and get each one as a UTC date in ISO 8601. Runs in this tab. Nothing leaves it.
Input
Plain text, one Unix timestamp per line. Blank lines are ignored and surrounding spaces are trimmed. Up to 1 MB and 10,000 lines.
Output
CSV with a header input,unit,iso_utc. One row per timestamp, in the order given. A magnitude at or above 100000000000 is read as milliseconds, otherwise as seconds. The date is UTC in ISO 8601 at seconds precision and milliseconds are truncated.
Limits
- UTC only. No time zone, no locale, no offset.
- Digits with an optional leading minus. Years 0001 to 9999.
- No date to timestamp, no natural language dates.
How this was made
The page, the manifest, the fixtures and this README came from the synthesis stub. The core transform was written by hand into the stub registry: there is no model in this factory, and the stub refuses any PRD it has no hand written entry for.
Errors
Every error names the field, the rule, and shows a small valid example. A line that is not a timestamp is named by its line number. There is no support desk.
Nothing stored
This runs in your browser tab. No upload, no cookie, no local storage, no analytics of the payload. Close the tab and it is gone.