README
dayOfYear
Determine the day of the year.
Installation
npm install @stdlib/time-day-of-year
Usage
var dayOfYear = require( '@stdlib/time-day-of-year' );
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
var dayOfYear = require( '@stdlib/time-day-of-year' );
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 );
}
CLI
Installation
To use the module as a general utility, install the module globally
npm install -g @stdlib/time-day-of-year
Usage
Usage: day-of-year [options] [<month> <day> <year>]
Options:
-h, --help Print this message.
-V, --version Print the package version.
Examples
$ day-of-year
<number>
For a specific date,
$ day-of-year 12 31 2016
366
Notice
This package is part of stdlib, a standard library for JavaScript and Node.js, 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.
Community
License
See LICENSE.
Copyright
Copyright © 2016-2022. The Stdlib Authors.