https://boiteaoutilsinformatique.fr/en/tools/timestamp-unix-converter-date/
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IT Tool

Unix Timestamp / Date Converter

Convert a Unix timestamp to a readable date, or convert a date to a timestamp in seconds or milliseconds.

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Date · Unix Epoch

Unix Timestamp / Date Converter

Convert a Unix timestamp to a readable date, or convert a date to seconds and milliseconds since January 1, 1970 UTC.

13-digit values are automatically interpreted as milliseconds.

Seconds or milliseconds?

A standard Unix timestamp counts seconds elapsed since January 1, 1970 at 00:00:00 UTC. JavaScript and some APIs use milliseconds instead, which normally produces a 13-digit value.

The UTC conversion is independent of time zone. The local time shown depends on the settings of the device opening the tool.

Practical guidance

Use the result with confidence

Recommended workflow

  1. Use a non-sensitive representative input for Unix timestamp conversion.
  2. Run the operation and review the result before copying or exporting it.
  3. Validate the output in the target application or environment before relying on it.

What to verify

  • Confirm the scope, units and input values before interpreting the output.
  • Separate the observed result from the operational decision that follows from it.
  • Validate the conclusion against the real target system, logs or configuration before changing production.
FAQ

Questions about this tool

What should I verify when using Unix timestamp conversion?

Check the source unit or encoding, the target representation and any sign, timezone, delimiter or permission convention that applies.

Can the converted value be ambiguous?

Yes. Units, character encodings, timestamps and permission notations can be interpreted differently when context is missing.

How do I validate the conversion?

Convert a known reference value first, then compare the result with the target system or specification.

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