Oracle 23c

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alter session set nls_date_format = 'SYYYY-MM-DD HH24:MI:SS'
select TO_DATE('01/01/2016 00:00:00','MM/DD/YYYY HH24:MI:SS'),
  dump(TO_DATE('01/01/2016 00:00:00','MM/DD/YYYY HH24:MI:SS'), 1016)
from dual;


TO_DATE('01/01/201600:00:00','MM/DD/YYYYHH24:MI:SS')
DUMP(TO_DATE('01/01/201600:00:00','MM/DD/YYYYHH24:MI:SS'),1016)


 2016-01-01 00:00:00
Typ=13 Len=8: e0,7,1,1,0,0,0,0


select TO_DATE('01/01/2016','MM/DD/YYYY'),
  dump(TO_DATE('01/01/2016','MM/DD/YYYY'), 1016)
from dual;


TO_DATE('01/01/2016','MM/DD/YYYY')
DUMP(TO_DATE('01/01/2016','MM/DD/YYYY'),1016)


 2016-01-01 00:00:00
Typ=13 Len=8: e0,7,1,1,0,0,0,0