function the_modified_date( $format = '', $before = '', $after = '', $display = true ) {
$the_modified_date = $before . get_the_modified_date( $format ) . $after;
/**
* Filters the date a post was last modified for display.
*
* @since 2.1.0
*
* @param string|false $the_modified_date The last modified date or false if no post is found.
* @param string $format PHP date format.
* @param string $before HTML output before the date.
* @param string $after HTML output after the date.
*/