Version 7.3 of Ultimate Post List Pro (UPLP) gives you some options to control the date of the last modification of a post.
Like the release date of a post (as known as publication date) you can
- sort posts by last modified date,
- show or hide the date of the last modification of the post,
- set the modification date clickable, pointing to the month archive,
- place the date at every position, e.g. after the post title or before the post thumbnail,
- align the date left, right or centered.