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

7399function wp_checkdate( $month, $day, $year, $source_date ) {7400	$checkdate = false;7401	if ( is_numeric( $month ) && is_numeric( $day ) && is_numeric( $year ) ) {7402		$checkdate = checkdate( (int) $month, (int) $day, (int) $year );7403	}7404 7405	/**7406	 * Filters whether the given date is valid for the Gregorian calendar.7407	 *7408	 * @since 3.5.07409	 *7410	 * @param bool   $checkdate   Whether the given date is valid.7411	 * @param string $source_date Date to check.7412	 */7413	return apply_filters( 'wp_checkdate', $checkdate, $source_date );7414}