can't use date w/time for in a selection range filter

My records are

1. 2021-06-17 16:20:18
2. 2021-06-17 16:02:27
3. 2021-06-17 17:16:49

only want to select the record 1 & 2.

but below sql not work, how to do

select * from

where per_employees_x     

creation_date >= TO_DATE(:p_ee_creation_date_fm, 'YYYY-MM-DD HH24:MI:SS')

AND creation_date<= TO_DATE(:p_ee_creation_date_to, 'YYYY-MM-DD HH24:MI:SS')