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Portfoliotools.

Developer

Timestamp Converter

Convert Unix timestamps to human dates and back, handling seconds and milliseconds, across timezones. Includes the current timestamp, ticking.

Runs entirely in your browser

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How it works

  1. 01Paste a Unix timestamp, or an ISO date, or anything date-like.
  2. 02Read it back in local time, UTC, ISO 8601 and both timestamp units.

Questions

Seconds or milliseconds?
Detected from the length: ten digits or fewer is treated as seconds, longer as milliseconds. Getting this wrong is what puts a date in 1970 or in the year 55000, so the guess is worth making explicit — the interpretation used is always shown.
What is the 2038 problem?
Systems storing Unix time in a signed 32-bit integer overflow on 19 January 2038. Anything modern uses 64-bit and is unaffected, but old embedded systems and legacy databases still hit it.
Is there a catch — a limit, a watermark, a sign-up?
None. Because the work happens on your machine rather than a server, there is no per-file cost to recover and therefore nothing to meter. No account, no queue, no watermark.