How do I format a timestamp in the control-panel list?

[chucktrukk]

I have a field called linked_at

      - handle: linked_at
        field:
          type: integer
          display: LinkedAt
          validate: required

How can I show this in the control-panel list as "Y-m-d"

[jackmcdade]

You're using an integer field which can only show integers (whole numbers), so that isn't possible. If you want an actual date/time thing to show, you can use the date fieldtype and you can control the formatting in the options.