139 lines
2.6 KiB
Markdown
139 lines
2.6 KiB
Markdown
<!--
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@license Apache-2.0
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Copyright (c) 2018 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# isoWeeksInYear
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> Determine the number of [ISO weeks][iso-week-date] in a year according to the [Gregorian calendar][gregorian-calendar].
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<section class="usage">
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## Usage
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```javascript
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var isoWeeksInYear = require( '@stdlib/time/iso-weeks-in-year' );
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```
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#### isoWeeksInYear( \[value] )
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Returns the number of [ISO weeks][iso-week-date] in a year according to the [Gregorian calendar][gregorian-calendar].
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```javascript
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var num = isoWeeksInYear();
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// returns <number>
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```
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By default, the function returns the number of [ISO weeks][iso-week-date] in the current year (according to local time). To determine the number of [ISO weeks][iso-week-date] for a particular year, provide either a year or a [`Date`][date-object] object.
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```javascript
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var num = isoWeeksInYear( new Date() );
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// returns <number>
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num = isoWeeksInYear( 2015 );
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// returns 53
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num = isoWeeksInYear( 2017 );
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// returns 52
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```
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</section>
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<!-- /.usage -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var isoWeeksInYear = require( '@stdlib/time/iso-weeks-in-year' );
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var v;
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var i;
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for ( i = 0; i < 2021; i++ ) {
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v = isoWeeksInYear( i );
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console.log( 'The year %d has %d ISO weeks.', i, v );
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}
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```
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</section>
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<!-- /.examples -->
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* * *
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<section class="cli">
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## CLI
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<section class="usage">
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### Usage
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```text
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Usage: iso-weeks-in-year [options] [year]
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Options:
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-h, --help Print this message.
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-V, --version Print the package version.
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```
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</section>
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<!-- /.usage -->
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<section class="examples">
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### Examples
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```bash
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$ iso-weeks-in-year
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<number>
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```
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For a specific year,
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```bash
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$ iso-weeks-in-year 2015
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53
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```
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</section>
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<!-- /.examples -->
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</section>
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<!-- /.cli -->
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<section class="links">
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[iso-week-date]: https://en.wikipedia.org/wiki/ISO_week_date
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[gregorian-calendar]: https://en.wikipedia.org/wiki/Gregorian_calendar
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[date-object]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date
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</section>
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<!-- /.links -->
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