WordPress at a glance
function is not described

WP_Query::is_day() public WP 3.1.0

Is the query for an existing day archive?

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

No Hooks.

Return

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

Usage

global $wp_query;
$wp_query->is_day();

Changelog

Since 3.1.0 Introduced.

Code of WP_Query::is_day() WP 5.6

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