WordPress at a glance
функция не описана

WP_Query::is_month() public WP 3.1.0

Is the query for an existing month archive?

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

Хуков нет.

Возвращает

true/false. Whether the query is for an existing month archive.

Использование

$WP_Query = new WP_Query();
$WP_Query->is_month();

Changelog

Since 3.1.0 Introduced.

Код WP_Query::is_month() WP 5.5.1

<?php
public function is_month() {
	return (bool) $this->is_month;
}