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Duration Converter
Convert a duration between seconds, ISO 8601, clock time and words.
A bare number is read as seconds. 1h 30m, PT1H30M and 01:30:00 all work too.
Quick Tool Overview
The Duration Converter reads a length of time however it is written — 5400, "1h 30m", PT1H30M, 01:30:00 — and returns all the others, including the ISO 8601 form that turns up in Kubernetes and XML schemas without ever being explained there.
- What it does
- Converts a duration between every notation
- You give it
- A duration in any form
- You get back
- Seconds, ISO 8601, clock time and words
- Best for
- Config files, APIs and timeouts
About the Duration Converter
Enter a duration however it comes — 5400, "1h 30m", PT1H30M, 01:30:00 — and get it in every other form, plus a breakdown into whole units.
The ISO 8601 duration is the one most people meet without being introduced. PT1H30M is one hour and thirty minutes; P1DT2H is one day and two hours; the T separates the date part from the time part, which is what stops the M in P1M (one month) meaning the same as the M in PT1M (one minute). It turns up in Kubernetes manifests, XML schemas, YouTube API responses and JSON schema definitions, and it is rarely explained where it appears.
Key features of the Duration Converter
ISO 8601 durations
Both read and written, including the T that separates months from minutes — the commonest mistake in a hand-written one.
Reads four notations
A bare number, a written duration, ISO 8601 and clock time, with the reading it chose stated explicitly.
Honest about months
Months and years use conventional averages, because their real length depends on which one you mean — the page says so rather than implying precision.
Broken into whole units
Weeks, days, hours, minutes, seconds and milliseconds, as well as each total on its own.
Plain English too
"1 hour and 30 minutes", ready to put in an interface.
How to use the Duration Converter
-
1
Enter a duration
5400, 1h 30m, PT1H30M or 01:30:00 — all are understood.
-
2
See how it was read
The page says which notation it recognised, so a bare number is never silently misread.
-
3
Read the conversions
Milliseconds, seconds, minutes, hours and days, plus ISO, clock and written forms.
-
4
Copy the form you need
Click any value to take it.
Frequently asked questions
One hour and thirty minutes. P opens the duration, T separates the date part from the time part, and each number is followed by its unit. P1DT2H30M is one day, two hours and thirty minutes.
Because M means months before the T and minutes after it. P1M is one month; PT1M is one minute. Leaving the T out is the commonest mistake in a hand-written ISO duration.
As conventional averages — 30.44 days and 365.25 days — because their real length depends on which month or year you mean. For anything that must be exact, calculate between two actual dates instead.
This reads it as seconds, which is what almost every configuration file means. If you meant milliseconds, add the unit — 5000ms — and the page will say how it read your input either way.
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