# timeInterval

#### signature: `timeInterval(scheduler: *): Observable<TimeInterval<any>> | WebSocketSubject<T> | Observable<T>`

## Convert an Observable that emits items into one that emits indications of the amount of time elapsed between those emissions

### Examples

**Example 1: Time between mouse clicks**

( [StackBlitz](https://stackblitz.com/edit/rxjs-time-interval?file=index.ts\&devtoolsheight=50) )

```js
// RxJS v6+
import { fromEvent } from 'rxjs';
import { timeInterval, tap } from 'rxjs/operators';

fromEvent(document, 'mousedown')
  .pipe(timeInterval(), tap(console.log))
  .subscribe(
    i =>
      (document.body.innerText = `milliseconds since last click: ${i.interval}`)
  );
```

### Related Recipes

* [Click Ninja Game](/learn-rxjs/recipes/click-ninja-game.md)

### Additional Resources

* [timeInterval](https://rxjs.dev/api/operators/timeInterval) 📰 - Official docs

***

> 📁 Source Code: <https://github.com/ReactiveX/rxjs/blob/master/packages/rxjs/src/internal/operators/timeInterval.ts>


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