Intl.DurationFormat.prototype.format()
======================================

**Experimental:** **This is an experimental technology**  
Check the Browser compatibility table carefully before using this in production.

The **`format()`** method of `Intl.DurationFormat` instances formats a duration according to the locale and formatting options of this `Intl.DurationFormat` object.

Syntax
------


```js
format(duration)
```

### Parameters

`duration`

The duration object to be formatted. It should include some or all of the following properties: `months`, `weeks`, `days`, `hours`, `minutes`, `seconds`, `milliseconds`, `microseconds`, `nanoseconds`.

### Return value

A string representing the given `duration` formatted according to the locale and formatting options of this `Intl.DurationFormat` object.

Examples
--------

### Using format()

The following example shows how to create a Duration formatter using the English language.


```js
const duration = {
  years: 1,
  months: 2,
  weeks: 3,
  days: 3,
  hours: 4,
  minutes: 5,
  seconds: 6,
  milliseconds: 7,
  microseconds: 8,
  nanoseconds: 9,
};

// Without options, style defaults to "short"
new Intl.DurationFormat("en").format(duration);
// "1 yr, 2 mths, 3 wks, 3 days, 4 hr, 5 min, 6 sec, 7 ms, 8 μs, 9 ns"

// With style set to "long"
new Intl.DurationFormat("en", { style: "long" }).format(duration);
// "1 year, 2 months, 3 weeks, 3 days, 4 hours, 5 minutes, 6 seconds, 7 milliseconds, 8 microseconds, 9 nanoseconds"

// With style set to "narrow"
new Intl.DurationFormat("en", { style: "narrow" }).format(duration);
// "1y 2mo 3w 3d 4h 5m 6s 7ms 8μs 9ns"
```

### Using format() with different locales and styles


```js
const duration = {
  hours: 1,
  minutes: 46,
  seconds: 40,
};

// With style set to "long" and locale "fr-FR"
new Intl.DurationFormat("fr-FR", { style: "long" }).format(duration);
// "1 heure, 46 minutes et 40 secondes"

// With style set to "short" and locale set to "en"
new Intl.DurationFormat("en", { style: "short" }).format(duration);
// "1 hr, 46 min and 40 sec"

// With style set to "short" and locale set to "pt"
new Intl.DurationFormat("pt", { style: "narrow" }).format(duration);
// "1h 46min 40s"

// With style set to "digital" and locale set to "en"
new Intl.DurationFormat("en", { style: "digital" }).format(duration);
// "1:46:40"

// With style set to "digital", locale set to "en", and hours set to "long"
new Intl.DurationFormat("en", { style: "digital", hours: "long" }).format(
  duration,
);
// "1 hour, 46:40"
```

### Using format() with the fractionalDigits option


```js
const duration = {
  hours: 11,
  minutes: 30,
  seconds: 12,
  milliseconds: 345,
  microseconds: 600,
};

new Intl.DurationFormat("en", { style: "digital" }).format(duration);
// "11:30:12.3456"

new Intl.DurationFormat("en", { style: "digital", fractionalDigits: 5 }).format(
  duration,
);
// "11:30:12.34560"

new Intl.DurationFormat("en", { style: "digital", fractionalDigits: 3 }).format(
  duration,
);
// "11:30:12.346"
```

Specifications
--------------

| Specification |
| --- |
| Intl.DurationFormat # sec-Intl.DurationFormat.prototype.format |

Browser compatibility
---------------------

BCD tables only load in the browser with JavaScript enabled. Enable JavaScript to view data.

See also
--------

* `Intl.DurationFormat`
* `Intl.supportedValuesOf()`
* `Intl`