Use Post Updated Date Plugin to display the Last Updated Date in WordPress Posts.
Plugin Tag: last-modified
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Show modified Date in admin lists
Show modified date column in the lists of pages and posts in the WordPress admin panel.
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Last Modified Timestamp
Adds the last modified time to the admin interface as well as a [last-modified] shortcode to use on the front-end.
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WP Last Modified Info
Ultimate Last Modified Plugin for WordPress with Gutenberg support. Use shortcodes to show last modified info on WP 4.7+ sites.
