Oracle 11g Release 2

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create table mytable(created_date timestamp);
  
insert into mytable
select to_timestamp('04-Mar-20 05:21:15.772000','dd-Mon-rr hh24:mi:ss.ff') from dual union all
select to_timestamp('28-Feb-20 01.15.25.702700','dd-Mon-rr hh24:mi:ss.ff') from dual;
 
2 rows affected

select created_date
  from mytable
 where cast(created_date as date) <= date'2020-02-28';
 
select created_date
  from mytable
 where trunc(cast(created_date as date)) <= date'2020-02-28'; 
 


CREATED_DATE


28-FEB-20 01.15.25.702700 AM