Que fait ISO 8601 Duration Calculator ?
ISO 8601 Duration Calculator permet de convertir des données ou des fichiers dans le navigateur et présente clairement le résultat et ses limites. Fonctions vérifiées : ISO duration output, Negative durations, Exact milliseconds, Local-time inputs.
Elapsed duration is not calendar duration
Use this page for exact milliseconds and fixed 24-hour-day arithmetic. Do not use it for business days, billing months, age calculations, or recurring calendar rules.
Comment l’utiliser ?
- Enter complete Start date and time and End date and time values in the browser’s current zone.
- Select Calculate; reversing the values produces a negative duration.
- Copy the ISO day/time form together with total days, hours, or milliseconds required by the next system.
Exemple réel d’entrée et de sortie
Measure one day, one hour, one minute, and one second
Entrée
Start: 2026-01-01 00:00:00
End: 2026-01-02 01:01:01Sortie
ISO 8601 duration: P1DT1H1M1S
Total hours: 25.017
Milliseconds: 90,061,000The calculation subtracts the two instants and expresses full 24-hour days plus the remaining time.
Erreurs fréquentes et corrections
| Symptôme | Cause probable | Correction |
|---|---|---|
| A month-long interval is not shown as P1M. | Months have different lengths, while this page reports exact elapsed 24-hour days. | Use a calendar-aware date library when month or year units must follow calendar arithmetic. |
| The elapsed hours around a DST change are not 24 for adjacent local dates. | Browser-local times can cross an offset transition. | Use Time Zone Converter to inspect the instants and choose UTC inputs for fixed elapsed-time calculations. |
Important behavior of Duration Calculator
Limite propre à cet outil : Elapsed days are exact 24-hour units; calendar months and business-day rules are intentionally excluded.
Normes et références d’implémentation
- W3C XML Schema — duration (opens in a new tab)Documents the PnYnMnDTnHnMnS lexical family used for duration values.
- MDN — datetime-local input (opens in a new tab)Explains why a datetime-local value contains no time-zone identifier.
Duration Calculator — FAQ
Does the Duration Calculator upload my input?
No. Processing runs in the current browser tab, and the page does not send tool input to a KitLumi processing endpoint.
What input does the Duration Calculator accept?
It accepts a start and end date with seconds. The workspace checks the input and reports malformed or unsupported values before it produces a result.
What does the Duration Calculator produce?
It produces ISO 8601 days/time notation plus total days, hours, and milliseconds. Copy and download controls appear when the output format supports them.
What limitation should I know?
Elapsed days are exact 24-hour units; calendar months and business-day rules are intentionally excluded.
Quelles modifications ?
Mise à jour substantielle : Duration Calculator: Added ISO duration output, Negative durations, Exact milliseconds, Local-time inputs, responsive controls, explicit runtime disclosure, and task-specific examples and limitations.