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About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

dayOfYear

NPM version Build Status Coverage Status

Determine the day of the year.

Usage

import dayOfYear from 'https://cdn.jsdelivr.net/gh/stdlib-js/time-day-of-year@esm/index.mjs';

dayOfYear( [month[, day, year]] )

Returns the day of the year.

var num = dayOfYear();
// returns <number>

By default, the function returns the day of the year for the current date (according to local time). To determine the day of the year for a particular day, provide month, day, and year arguments.

var num = dayOfYear( 12, 31, 2016 );
// returns 366

num = dayOfYear( 12, 31, 2017 );
// returns 365

A month may be either a month's integer value, three letter abbreviation, or full name (case insensitive).

var num = dayOfYear( 12, 31, 2016 );
// returns 366

num = dayOfYear( 'dec', 31, 2016 );
// returns 366

num = dayOfYear( 'december', 31, 2016 );
// returns 366

The function also supports providing a Date object.

var num = dayOfYear( new Date() );
// returns <number>

Examples

<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">

import dayOfYear from 'https://cdn.jsdelivr.net/gh/stdlib-js/time-day-of-year@esm/index.mjs';

var v;
var i;

for ( i = 0; i < 2021; i++ ) {
    v = dayOfYear( 'Dec', 31, i );
    console.log( 'In the year %d, December 31 is day number %d.', i, v );
}

</script>
</body>
</html>

See Also


Notice

This package is part of stdlib, a standard library with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.