What it does
Check technical log dates without confusing seconds and milliseconds. Output identifies UTC, the device time zone and the same instant in both units.
When to use it
Use this workflow when the example below matches your task and the documented limits fit your input. Keep the original and review the output before sharing it.
Steps
- Select seconds, milliseconds or ISO 8601.
- Enter an integer or a complete date with Z or an offset.
- Convert and compare ISO, local time zone and both Unix units.
Worked example
Unix: -1 second.
1969-12-31T23:59:59.000Z; -1000 milliseconds.
Common mistakes and limitations
- Integer Unix input; dates within ±8.64e15 ms. ISO input requires a four-digit year and explicit offset.
- Does not parse month names, abbreviated zones or ambiguous local dates; leap seconds are not modeled.
Frequently asked questions
Is my input uploaded?
No. Processing runs in your browser. Visiting the site downloads public software and resources; this tool does not automatically save your input or results.
How do I check the result?
Start with the worked example, compare the output and use synthetic data before processing sensitive information. Downloaded files should be opened in an independent reader.