Inform user when plugin was updated (how many dates ago was the update released)

[Daedalon]

On wp-admin/update-core.php when there are new plugin updates, it would be useful to mention when the update was released. This would make life easier for admins who have a policy of only installing updates of certain maturity, eg. at least 7 days old. Such policies are used to ensure updating only to versions that don't introduce critical bugs.

Currently the age of the update is shown only by clicking to open update details in modal window, which then needs to be closed. So in order to check for the respective ages of 7 updates, admin needs to click back-and-forth 14 times to decide which plugins to update. Because everyone hates breaking a stable site, this effort required leads to some admins to go through the list less often, and then run less up-to-date plugins, which can cause problems in itself.

Current output of plugin list:

Contact Form 7
You have version 3.3.3 installed. Update to 3.4. [View version 3.4 details.]
Compatibility with WordPress 3.5.1: 100% (according to its author)

Suggested output:

Contact Form 7
You have version 3.3.3 installed. Update to 3.4. [View version 3.4 details.]
Compatibility with WordPress 3.5.1: 100% (according to its author). This update was released 9 days ago.

[SergeyBiryukov]

Related: #18821

[chriscct7]

Closing as maybelater. Complete lack of interest on the feature on the ticket over the last 2 years. Feel free to reopen when more interest re-emerges (particularly if there's a patch)