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ISO Designator Duration Inspector
Inspect an uppercase duration subset with exact fixed seconds and separate calendar components requiring an anchor.
Uppercase designator duration (text)
Complete exact JSON report
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter Uppercase designator duration, such as P1DT2H3M4.5S or P2W.
- Select Inspect duration.
- Download duration-report.json to inspect every original component, presence flag and exact fixed/calendar totals.
Examples
P1Y2M3DT4H5M6.125S has fixedPartSeconds2191249/8; nonzero years/months make needsAnchor=true and totalDurationSeconds=null.
Limitations
- Up to 200 input units, 9 integer digits per component, 1–9 fractional digits on seconds only, 64 KiB report and a 30-second processing limit.
- Use ordered nonnegative uppercase designators PnYnMnDTnHnMnS or standalone PnW. No signs, whitespace, mixed weeks, decimal commas or bare P/T.
- No implicit carries, month-to-day conversion, timezone application or full ISO 8601 conformance claim.
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