Change record status: 
Project: 
Introduced in branch: 
8.x
Introduced in version: 
8.0
Description: 

A new EntityChangedInterface has been added to be used by entities which have changed timestamp information to track / provide. The interface exposes the changed timestamp via the getChangedTime() method. Implement this interface and provide this method if your entity has changed timestamp tracking, eg:

<?php
use Drupal\Core\Entity\ContentEntityInterface;
use
Drupal\Core\Entity\EntityChangedInterface;
interface
YourContentEntityInterface extends ContentEntityInterface, EntityChangedInterface {
// ...
}
?>

The EntityChangedInterface may be used in the future to facilitate edit overwrite protection on content entities as well as better caching.

Impacts: 
Module developers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done