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# daysInYear

> Determine the number of days in a year according to the [Gregorian calendar][gregorian-calendar].

<section class="usage">

## Usage

```javascript
var daysInYear = require( '@stdlib/time/days-in-year' );
```

#### daysInYear( \[value] )

Returns the number of days in a year according to the [Gregorian calendar][gregorian-calendar].

```javascript
var num = daysInYear();
// returns <number>
```

By default, the function returns the number of days in the current year (according to local time). To determine the number of days for a particular year, provide either a year or a [`Date`][date-object] object.

```javascript
var num = daysInYear( new Date() );
// returns <number>

num = daysInYear( 2000 );
// returns 366

num = daysInYear( 2017 );
// returns 365
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   The function's return value is a generalization and does **not** take into account inaccuracies due to daylight savings conventions, crossing timezones, or other complications with time and dates. 

</section>

<!-- /.notes -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var daysInYear = require( '@stdlib/time/days-in-year' );

var v;
var i;

for ( i = 0; i < 2021; i++ ) {
    v = daysInYear( i );
    console.log( 'The year %d has %d days.', i, v );
}
```

</section>

<!-- /.examples -->

* * *

<section class="cli">

## CLI

<section class="usage">

### Usage

```text
Usage: days-in-year [options] [year]

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
```

</section>

<!-- /.usage -->

<section class="examples">

### Examples

```bash
$ days-in-year
<number>
```

For a specific year,

```bash
$ days-in-year 2016
366
```

</section>

<!-- /.examples -->

</section>

<!-- /.cli -->

<section class="links">

[gregorian-calendar]: https://en.wikipedia.org/wiki/Gregorian_calendar

[date-object]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date

</section>

<!-- /.links -->