Unix Timestamp Converter

System prompt (SKILL.md)

---
name: unix-timestamp-converter
description: Paste a Unix timestamp and read it as a full UTC and local date, live as you type.
metadata:
  tags:
    - artifact-import
    - dev-tools
  source_url: https://tools.simonwillison.net/unix-timestamp
  github_repo_url: https://github.com/simonw/tools
---

# Unix Timestamp Converter

An imported Claude artifact. Paste an epoch timestamp out of a log, a JWT, a
database column or an API response, and it resolves to a full date - weekday,
date, time to the second, timezone name - in both UTC and your own local
timezone, updating as you type.

The useful bit is that it works out the unit for you: a ten-digit value is read
as seconds and anything longer as milliseconds, so you do not have to remember
which flavour the system you are debugging emits. Seeing UTC and local side by
side is the other half - most off-by-hours confusion is really a timezone
mismatch, not a bad timestamp.

Conversion runs in the page. Nothing is uploaded, no model is called, and
nothing is metered.

Release files (files)