What can be done with the JSON "expires": "0001-01-01T00:00:00Z" field

When using the API, we can retrieve the below information for each dashboard. Expires appears to be set to the same default field for every dashboard. What can be done with the expired field? Can it just be set to expire the dashboard at a certain date and time, or could we do anything else with it?

    "expires": "0001-01-01T00:00:00Z",
    "created": "2021-07-07T09:08:18Z",
    "updated": "2021-07-07T16:03:26Z",