When the certificate was last modified.
{ "$schema": "https://json-schema.org/draft/2020-12/schema", "$id": "#/components/schemas/tls-certificates-and-hostnames_modified_on", "title": "tls-certificates-and-hostnames_modified_on", "description": "When the certificate was last modified.", "example": "2014-01-01T05:20:00Z", "format": "date-time", "readOnly": true, "type": "string" }