APEX

While executing the below query I am getting the output with fractional seconds

    select to_timestamp_tz(systimestamp,'DD-MM-YY HH12:MI:SS.FF AM TZH:TZM') from dual;

Output :

01-MAY-15 02.54.55.364000000 PM +05:30

I want the output without fractional seconds like :

01-MAY-15 02:56:21 PM +05:30

Could you please suggest how can I get the output without fractional seconds.

I can not change the NLS settings.

Thanks.