wp_checkdate() WordPress Function

function wp_checkdate( $month, $day, $year, $source_date ) {
	/**
	 * Filters whether the given date is valid for the Gregorian calendar.
	 *
	 * @since 3.5.0
	 *
	 * @param bool   $checkdate   Whether the given date is valid.
	 * @param string $source_date Date to check.
	 */
	return apply_filters( 'wp_checkdate', checkdate( $month, $day, $year ), $source_date );
}
Uses	Description
wp-includes/functions.php:wp_checkdate	Filters whether the given date is valid for the Gregorian calendar.
wp-includes/plugin.php:apply_filters()	Calls the callback functions that have been added to a filter hook.
Used By	Description
wp-includes/post.php:wp_resolve_post_date()	Uses wp_checkdate to return a valid Gregorian-calendar value for post_date.
wp-includes/ms-site.php:wp_validate_site_data()	Validates data for a site prior to inserting or updating in the database.
wp-includes/class-wp-date-query.php:WP_Date_Query::validate_date_values()	Validates the given date_query values and triggers errors if something is not valid.
wp-admin/includes/post.php:_wp_translate_postdata()	Renames `$_POST` data from form names to DB post columns.
wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::save()	Handles customize_save WP Ajax request to save/update a changeset.
wp-includes/class-wp-query.php:WP_Query::parse_query()	Parse a query string and set query type booleans.
wp-includes/canonical.php:redirect_canonical()	Redirects incoming links to the proper URL based on the site url.