alci1969

Last Revision Date Widget adds a useful widget which you can use to see the last revision date of your post/page.
<h4>Usage</h4>
Simply go to <code>Appearance > Widgets</code> and drag “Last Revision Widget” to the sidebar of your choice.

Last Revision Date Widget

Easily add a last revision date widget to your WordPress site sidebar.

Robin W

This Plugin changes the ‘freshness ‘ that bbPress displays on topic and forum lists (eg 4 hours ago) to the date of the last post to that forum or topic (eg 17th January 2014 at 5.15pm).
It also allows you to set the heading for this new date format.
The existing (bbpress) Recent Topics widget works with date, but a revised Recent Replies Widget to display the date format called (Last Post) Recent Replies is included.

bbp last post

After trying to code things myself (to keep the number of plugins down), I found it easier simply to install this.

Very happy, it works perfectly

For bbPress - changes the freshness displays to date

Last Revision Date Widget vs bbp last post