How to create a Value Set with Date Format of YYYY only

Summary:

I am attempting to setup a DFF to display a date in YYYY format.

I am creating the Value Set as;

Validation Type: Format Only

Value Data Type: Date

I am creating the DFF as;

Data Type: Date

Display Type: Date/Time

Content (required):

After completing the setup I can see that the default display is DD/MM/YYYY

I'd like to only have the values showing as YYYY

Version (include the version you are using, if applicable):

21D

Code Snippet (add any code snippets that support your topic, if applicable):