关于PL/SQL的一个问题

declare
       type test1_type is record
       (
            minute smallint,
            hour smallint
       );
      
       type test2_type is record
       (
            day date,
            time test1_type,
            place char(20),
            purpose char(50)
       );
      
       type test3_type is record
       (
            day date,
            time test1_type,
            bus_fare char(15)
       );
      
       metting test2_type;
       seminar test2_type;
       part test3_type;
begin
     metting.day := '11-12-2002';
     metting.time.minute := 45;
     metting.time.hour := 10;
    
     seminar.time := metting.time;
     part.time := metting.time;
end;

每次编译的时候总提示无效的月份，请高手指点……