plsql - Removing the millisecond from the timestamp -

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i need convert timestamp date in pl sql. input '2016-08-01t09:16:47.000' webservice, require '8/01/2016 9:16:47 am'. i take input varchar2.

it can "am" or "pm".

i tried using select trunc(to_timestamp('2016-08-01t09:16:47.000','yyyy-mm-dd"t"hh24:mi:ss.ff3')) dual; time part removed.

select to_char(to_timestamp('08/01/2016 09:16:47.000000000 am', 'mm/dd/yyyy hh:mi:ss.ff am'),'mm/dd/yyyy hh:mi:ss am') dual;

edit: works or pm

select to_char(to_timestamp('08/01/2016 09:16:47.000000000 pm', 'mm/dd/yyyy hh:mi:ss.ff am'),'mm/dd/yyyy hh:mi:ss am') dual;

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