Change record status: 
Project: 
Introduced in branch: 
9.4.x
Introduced in version: 
9.4.0
Description: 

The core/drupal.date asset library supports browsers that are no longer supported by Drupal. Accordingly this library is deprecated. In addition, Drupal\Core\Render\Element\Date::processDate(), which adds data attribute data-drupal-date-format, is deprecated. The data attribute will no longer appear in markup.

There is no replacement.

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