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

select DATE '2016-01-01',
  dump(DATE '2016-01-01', 1016)
from dual;

DATE'2016-01-01'
DUMP(DATE'2016-01-01',1016)

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

select CAST(TIMESTAMP '2016-01-01 00:00:00' AS DATE),
  dump(CAST(TIMESTAMP '2016-01-01 00:00:00' AS DATE), 1016)
from dual;

CAST(TIMESTAMP'2016-01-0100:00:00'ASDATE)
DUMP(CAST(TIMESTAMP'2016-01-0100:00:00'ASDATE),1016)

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