SQL> alter session set nls_date_format = 'dd.mm.yyyy hh24:mi:ss';

Session altered.

SQL> create table test
  2    (isbn varchar2(30),
  3     date_entered date default sysdate
  4    );

Table created.

SQL> insert into test (isbn) values ('1234');

1 row created.

SQL> select * From test;

ISBN                           DATE_ENTERED
------------------------------ -------------------
1234                           13.02.2018 19:45:34

SQL>