When displaying a date field that it's a facet having a human readable label is more user friendly as opposed to a ISO8601 datestamp.
Expose the format_date for all date fields in facets and don't constrain it just to date range facets.
Create a facet field from a date
Ensure that it's not a range field
Enter a date format such as Y-m-d
Search for some content, note how the formatted date is displayed as opposed to the full timestamp
The UI for configuring a date type facet field changes a bit by bubbling up the date format to live outside of the range facet fieldset
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