the_modified_time( string $format = '' )

function the_modified_time($d = '') {
	/**
	 * Filters the localized time a post was last modified, for display.
	 *
	 * @since WP-2.0.0
	 *
	 * @param string $get_the_modified_time The formatted time.
	 * @param string $d                     The time format. Accepts 'G', 'U',
	 *                                      or php date format. Defaults to value
	 *                                      specified in 'time_format' option.
	 */
	echo apply_filters( 'the_modified_time', get_the_modified_time($d), $d );
}