Dica Oracle - Quando a role foi criada?

SQL> desc dba_roles;
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 ROLE                                      NOT NULL VARCHAR2(30)
 PASSWORD_REQUIRED                                  VARCHAR2(8)
 AUTHENTICATION_TYPE                                VARCHAR2(11)

SQL> select to_char(ctime,'dd/mm/yyyy hh24:mi:ss') created from sys.user$ where name='RESOURCE';

CREATED
-------------------
16/10/2017 11:15:38