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Windows FILETIME Converter

Convert Windows FILETIME 100-nanosecond ticks to ISO UTC and back without losing the sub-millisecond part.

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FILETIME starts at 1601-01-01 UTC. ISO input requires Z and allows up to seven fractional digits; negative FILETIME values are rejected.

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

How to use

  1. Convert Windows FILETIME 100-nanosecond ticks to ISO UTC and back without losing the sub-millisecond part.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

116444736000000000 ⇄ 1970-01-01T00:00:00.0000000Z

Details and limitations

FILETIME starts at 1601-01-01 UTC. ISO input requires Z and allows up to seven fractional digits; negative FILETIME values are rejected.

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

FAQ

Windows FILETIME Converter — What are the supported inputs and limits?

FILETIME starts at 1601-01-01 UTC. ISO input requires Z and allows up to seven fractional digits; negative FILETIME values are rejected.

Format references

Tool page updated: