the_modified_time()

the_modified_time( string $format = '' )

function the_modified_time( $format = '' ) {
	/**
	 * Filters the localized time a post was last modified, for display.
	 *
	 * @since 2.0.0
	 *
	 * @param string|false $get_the_modified_time The formatted time or false if no post is found.
	 * @param string       $format                Format to use for retrieving the time the post
	 *                                            was modified. Accepts 'G', 'U', or PHP date format.
	 */
	echo apply_filters( 'the_modified_time', get_the_modified_time( $format ), $format );
}