WordPress at a glance
function is not described

WP_Locale::get_month() public WP 2.1.0

Retrieve the full translated month by month number.

The $month_number parameter has to be a string because it must have the '0' in front of any number that is less than 10. Starts from '01' and ends at '12'.

You can use an integer instead and it will add the '0' before the numbers less than 10 for you.

{} It's a method of the class: WP_Locale{}

No Hooks.

Return

String. Translated full month name.

Usage

$WP_Locale = new WP_Locale();
$WP_Locale->get_month( $month_number );
$month_number(string/int) (required)
'01' through '12'.

Changelog

Since 2.1.0 Introduced.

Code of WP_Locale::get_month() WP 5.5.3

<?php
public function get_month( $month_number ) {
	return $this->month[ zeroise( $month_number, 2 ) ];
}