Duration Converter
Convert a duration between seconds, minutes, hours, clock notation and ISO 8601 — 90m, 01:30:00 and PT1H30M all read the same.
Enter something above to see the result.
One duration, every notation
Enter a span in whichever form you have it — 90m, 1h 30m, 01:30:00, PT1H30M or a bare number of seconds — and every other representation appears.
The ISO 8601 form is what JSON Schema, Kubernetes manifests and calendar formats expect; the clock form is what a log or a spreadsheet shows.
Frequently asked questions
Is a bare number read as seconds or milliseconds?
Seconds, which is the more common convention for a duration. Add "ms" explicitly for milliseconds.
Why is there no month or year?
Neither has a fixed length — a month is 28 to 31 days — so converting them to seconds would be a guess rather than a conversion.
Related tools
Time Zone ConverterSee one instant across every major time zone at once, with the offset that actually applied on that date.Epoch & Unix Timestamp ConverterConvert a Unix timestamp to a human-readable date in any time zone, and back again — seconds, milliseconds or microseconds.Cron Expression ParserRead a cron expression in plain words, field by field, before it runs in production at the wrong time.