wp_checkdate( int $month, int $day, int $year, string $source_date ): bool

Tests if the supplied date is valid for the Gregorian calendar.

Parameters

$monthintrequired: Month number.
$dayintrequired: Day number.
$yearintrequired: Year number.
$source_datestringrequired: The date to filter.

Return

bool True if valid date, false if not valid date.

Source

function wp_checkdate( $month, $day, $year, $source_date ) {
	$checkdate = false;
	if ( is_numeric( $month ) && is_numeric( $day ) && is_numeric( $year ) ) {
		$checkdate = checkdate( (int) $month, (int) $day, (int) $year );
	}

	/**
	 * 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, $source_date );
}

View all references View on Trac View on GitHub

Hooks

apply_filters( ‘wp_checkdate’, bool $checkdate, string $source_date ): Filters whether the given date is valid for the Gregorian calendar.

Uses	Description
apply_filters()`wp-includes/plugin.php`	Calls the callback functions that have been added to a filter hook.

Used by	Description
wp_resolve_post_date()`wp-includes/post.php`	Uses wp_checkdate to return a valid Gregorian-calendar value for post_date.
wp_validate_site_data()`wp-includes/ms-site.php`	Validates data for a site prior to inserting or updating in the database.
WP_Date_Query::validate_date_values()`wp-includes/class-wp-date-query.php`	Validates the given date_query values and triggers errors if something is not valid.
_wp_translate_postdata()`wp-admin/includes/post.php`	Renames `$_POST` data from form names to DB post columns.
WP_Customize_Manager::save()`wp-includes/class-wp-customize-manager.php`	Handles customize_save WP Ajax request to save/update a changeset.
WP_Query::parse_query()`wp-includes/class-wp-query.php`	Parses a query string and sets query type booleans.
redirect_canonical()`wp-includes/canonical.php`	Redirects incoming links to the proper URL based on the site url.