[wp-trac] [WordPress Trac] #64443: Show last updated date for locally installed plugins and themes

[WordPress Trac]

#64443: Show last updated date for locally installed plugins and themes
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 Reporter:  iflairwebtechnologies  |      Owner:  (none)
     Type:  enhancement            |     Status:  new
 Priority:  normal                 |  Milestone:  Awaiting Review
Component:  Administration         |    Version:  trunk
 Severity:  normal                 |   Keywords:  has-patch needs-testing
  Focuses:  ui                     |
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 Problem:
 Currently, WordPress does not show when a locally installed plugin or
 theme was last modified.
 This makes it difficult for site owners and developers to identify recent
 local changes such as
 manual edits, deployments, or hotfixes that are not reflected in
 repository update data.

 Proposed Solution:
 Display a "Last updated" date for locally installed plugins and themes
 based on filesystem
 modification time. This information is shown only in the admin UI and does
 not affect update
 checks or permissions.

 Implementation Details:
 - Plugins: Uses the filesystem modification time of the plugin
 file/directory and displays
   the date in the Plugins list table meta row.
 - Themes: Determines the most recent modification time using style.css as
 a primary reference,
   with a fallback scan of the theme directory, and exposes the value to
 the Themes screen UI.
 - Dates are formatted using date_i18n() and include proper translator
 comments.

 Benefits:
 - Helps administrators quickly identify recently changed plugins or themes
 - Useful for debugging, deployments, and staging/production sync checks
 - UI-only enhancement with no impact on core update logic

 Testing:
 - Verified with single-file plugins and directory-based plugins
 - Verified with classic and block themes
 - Tested on fresh installs and modified local themes

 Patch:
 Attached patch implements the above changes.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64443>
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