Convert Varchar2 datatype Date Value To Date Datatype

Hello,
I have a date value like the following as varchar2 datatype.
31-DEC-10 08.40.53 AMI would like to convert this to_date as date datatype.
How could I do this?

Use the right format mask?
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/functions183.htm#SQLRF06132
SQL> select to_date('31-DEC-10 08.40.53 AM', 'dd-mon-yy hh.mi.ss am')
2 from dual;
TO_DATE('31-DEC-100
31-12-2010 08:40:53
1 row selected.
SQL> declare
2    dt date;
3 begin
4    dt := to_date('31-DEC-10 08.40.53 AM', 'dd-mon-yy hh.mi.ss am');
5    dbms_output.put_line(to_char(dt, 'dd-mm-yyyy hh24:mi:ss'));
6 end;
7 /
31-12-2010 08:40:53
PL/SQL procedure successfully completed.

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