About this tool
A Unix timestamp counts seconds (or milliseconds) since January 1, 1970 UTC — the standard way computers represent time internally. This tool converts timestamps to readable dates and vice versa.
How it works
- Paste a timestamp to see it as a UTC date, ISO 8601 string, local time, and relative time.
- Or pick a date and time to get its equivalent Unix timestamp.
- The current timestamp updates on page load for quick copy-paste.
Frequently asked questions
How do I know if my timestamp is seconds or milliseconds?
A 10-digit number is seconds (covers dates up to the year 2286); a 13-digit number is milliseconds. This tool detects it automatically by length.
Why is the Unix epoch January 1, 1970?
It was an arbitrary but convenient reference point chosen by early Unix developers — it predates most systems that use it today, but has stuck as the universal standard.