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HeyTools

Converters

Timestamp Converter

Convert Unix timestamps to ISO and locale dates, or parse a date string back to epoch seconds. Supports seconds and milliseconds, plus a one-click “now” mode.

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How to use

  1. Pick Unix → Date, Date → Unix, or Now
  2. Enter a timestamp or date string if needed
  3. Copy Unix, ISO, or locale output

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Frequently asked questions

Seconds or milliseconds?

Absolute values under 1e12 are treated as seconds; larger values are treated as milliseconds—so both common API formats work.

What outputs do I get?

Each conversion shows Unix seconds, an ISO-8601 UTC string, and a locale-formatted date from your browser settings.

Is conversion private?

Yes. Parsing and formatting run entirely in your browser; nothing is uploaded.