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Batch Timestamp Converter

Convert lines of Unix seconds or milliseconds to ISO dates, or reverse the conversion.

Convert in your browser · No sign-up

Maximum 1000 lines; blank lines are preserved. ISO input requires an explicit offset or Z. Seconds are floored, including before 1970.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Result

Add your input or load an example, then run the tool. Your result will appear here.

How to use

  1. Convert lines of Unix seconds or milliseconds to ISO dates, or reverse the conversion.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

0 → 1970-01-01T00:00:00.000Z

Details and limitations

Text stays in your browser; it is not sent to a conversion server.

Format references

Tool page updated: