create table t ( test1 varchar2(22) )
Table created.
insert into t values ( '07/23/2001 02:20:55 AM' )
1 row(s) inserted.
select to_char(test1, 'hh:mi:ss')
from t
ORA-01722: invalid numberMore Details: https://docs.oracle.com/error-help/db/ora-01722