SQL> select sysdate from dual;
SYSDATE
-------------------
18/05/2007 10:20:21

1 row selected.

SQL> declare dt date;
  2  begin
  3    execute immediate 'begin :dt := sysdate; end;' using out dt;
  4    dbms_output.put_line (dt);
  5  end;
  6  /
18/05/2007 10:23:06

PL/SQL procedure successfully completed.