#18: pre_link_description

pre_link_description.php

<?php
/**
 * Replace link description with last-edited date and time
 *
 * @see sanitize_bookmark_field()
 *
 * @param string $value The original link description.
 *
 * @return string The last-edited date and time.
 */
function wpdocs_pre_link_description( $value ) {
	// Combines date_format and time_format together
	$date_time_format = sprintf( '%1$s, %2$s', get_option( 'date_format' ), get_option( 'time_format' ) );

	// Combines 'Last Edited: ' with the localized date/time format
	$last_edited = sprintf( __( 'Last Edited: %s', 'yourtextdomain' ), date_i18n( $date_time_format ) );

	return esc_attr( $last_edited );
}
add_filter( 'pre_link_description', 'wpdocs_pre_link_description' );