This change was indeed introduced in Windows 11. To restore the full date and time, you can follow these steps:
1. Right-click on the taskbar and select Taskbar settings.
2. Scroll down to the 'Notification area' section and click on 'Turn system icons on or off'.
3. Toggle the switch for 'Clock' to 'On'.
This should restore the full date and time on your taskbar.
