ISO 8601 Duration Parser & Builder
Parse ISO 8601 durations (P3Y2M10DT2H30M15S) and build canonical strings from numeric inputs.
About this tool
Two-tab tool. Parse mode: paste an ISO 8601 duration and decode it to years/months/weeks/days/hours/minutes/seconds plus a humanised summary. Build mode: type numeric fields and emit the canonical ISO 8601 duration with zero parts omitted. Supports the alternate week form (PnW).