SQL & PL/SQL

hi
i try use "DATE" as column name
i know what this isn't good, but it's interesting moment =)

create table t( "DATE" date);
insert into t values (sysdate);

sql query work fine

select "DATE" from t
16.02.2011 15:38:25

but in plsql block not work

declare
 t date; 
begin
    select t."DATE"
       into t from ttt;
    dbms_output.put_line(t);
end; 

any idea why?

alex