Random ISO 8601 Duration Generator
Includes calendar and time components, e.g. P1Y6M or P2DT3H.
ISO 8601 duration generated locally in your browser.
ISO 8601 durations for APIs and fixtures
Generate a random, syntactically valid ISO 8601 duration in the P…T… period format — strings like PT45M, P2DT3H, or P1Y6M that show up in video lengths, subscription and billing periods, retention windows, and schema-validated config.
Zero-valued components are omitted so every value stays canonical, and the T separator only ever appears when a time component follows it. Enable time only for the PT… shape that most APIs expect.