daysInMonth

Determine the number of days in a month.

Usage

var daysInMonth = require( '@stdlib/time/days-in-month' );

daysInMonth( [month[, year]] )

Returns the number of days in a month.

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

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

var num = daysInMonth( 2 );
// returns <number>

num = daysInMonth( 2, 2016 );
// returns 29

num = daysInMonth( 2, 2017 );
// returns 28

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

var num = daysInMonth( 2, 2016 );
// returns 29

num = daysInMonth( 'feb', 2016 );
// returns 29

num = daysInMonth( 'february', 2016 );
// returns 29

The function also supports providing a Date object.

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

Examples

var daysInMonth = require( '@stdlib/time/days-in-month' );

var v;
var i;

for ( i = 0; i < 2021; i++ ) {
    v = daysInMonth( 'feb', i );
    console.log( 'In the year %d, February has %d days.', i, v );
}

CLI

Usage

Usage: daysinmonth [options] [month] [year]

Options:

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

Examples

$ daysinmonth
<number>

For a specific month,

$ daysinmonth 2
<number>

For a specific month and year,

$ daysinmonth 2 2016
29