sql - Convert yyyy/mm/dd into dd/mm/yyyy hh24:MI:SS -

i'm trying convert data in format 2016/06/26 26/06/2016 00:00:00 trying few option time getting error "invalid months name", idea/advice? thanks

select to_date('2016/05/07 00:00:00','mm/dd/yyyy hh24:mi:ss') dual 

in order convert string date need convert first date. problems trying format string not date. specific case be:

--convert first date select to_date('2016/05/07 00:00:00','yyyy/mm/dd hh24:mi:ss')    dual  --then convert string in format want: select to_char( to_date('2016/05/07 00:00:00','yyyy/mm/dd hh24:mi:ss'),                 'mm/dd/yyyy hh24:mi:ss' )   dual  --since want date:  --then convert string in format want: select to_date( to_char( to_date('2016/05/07 00:00:00',                                  'yyyy/mm/dd hh24:mi:ss'),                          'mm/dd/yyyy hh24:mi:ss' )                 'mm/dd/yyyy hh24:mi:ss' )    dual 

if want convert string date no matter format, use first select showed. @boneist in comments pointing out.