How does Random Duration Generator make its random choices?

The integer count of selected base units is chosen with secure rejection sampling across the inclusive range.

Does Random Duration Generator upload my inputs or results?

No. Values stay in the current browser tab and are not placed in the URL, analytics, storage, or network requests.

When should I use Random Duration Generator?

Use it for timeout fixtures, exercise intervals, scheduling examples, or test cases that need valid duration formatting.

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Random Duration Generator

Generate durations inside an exact range and display each value in machine and human-readable units. The complete workflow runs locally in this browser, with visible controls and a result you can inspect before copying or downloading.

LOCAL WORKBENCH

Generate a result

No upload · no account · no URL storage

Choose your settings, then select Generate.

How it works

Convert both endpoints into an integer base-unit interval without losing the selected granularity.
Draw each base-unit count uniformly from the inclusive interval.
Format the same value as a component duration and optional ISO 8601 string.

Worked example

3,665 seconds is shown as 1 hour 1 minute 5 seconds and, when enabled, PT1H1M5S.

Limits and interpretation

The largest supported input represents one year at the selected unit's configured cap.
Durations are elapsed quantities and do not account for calendar months, daylight saving changes, or leap seconds.
A batch contains at most 1,000 results.

Privacy

Your inputs and generated results stay in this browser. This tool does not put them in a URL, analytics event, server log, or external request.

Frequently asked questions

How does Random Duration Generator make its random choices?: The integer count of selected base units is chosen with secure rejection sampling across the inclusive range.
Does Random Duration Generator upload my inputs or results?: No. Values stay in the current browser tab and are not placed in the URL, analytics, storage, or network requests.
When should I use Random Duration Generator?: Use it for timeout fixtures, exercise intervals, scheduling examples, or test cases that need valid duration formatting.