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Unix Timestamp Converter

What is this tool?

A two-way Unix time converter. Paste a timestamp in seconds or milliseconds to see the date it represents, or pick a date and time to get its epoch value — all computed in your browser with the standard Date and Intl APIs.

When to use it

  • Reading a timestamp value from a log file, API response or database row
  • Converting a human date into the epoch value an API expects
  • Checking what a token's exp or iat claim resolves to
  • Comparing a stored timestamp against the current time
  • Working out a date in UTC when your machine is in another time zone

How to use it

  1. 1To decode a timestamp, paste it into the Timestamp → date field (12+ digits are treated as milliseconds)
  2. 2Read the UTC and local-time results, and copy the ISO 8601 string if you need it
  3. 3To encode a date, pick it in the Date → timestamp field
  4. 4Copy the seconds or milliseconds value from the result
  5. 5Use the live current-epoch clock at the top for a quick 'now' value

Frequently asked questions

Does it handle seconds and milliseconds?

Yes — a value with 12 or more digits is read as milliseconds, anything shorter as seconds.

Which time zone are results shown in?

Both UTC and your browser's local time zone, so you can cross-check without doing the offset maths yourself.

Is the conversion done on a server?

No — it uses your browser's built-in Date and Intl APIs; nothing is transmitted.

What date format does the copy button use?

ISO 8601 (for example 2024-01-15T09:30:00.000Z), which most languages and APIs parse directly.