postgresql - How to subtract seconds from postgres datetime -

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say have column of type datetime value "2014-04-14 12:17:55.772" & need subtract seconds "2" seconds o/p "12:17:53".

select '2014-04-14 12:17:55.772'::timestamp - interval '2 seconds';

for greater flexibility possible mutiply interval

select '2014-04-14 12:17:55.772'::timestamp - 2 * interval '1 second';

if want truncate second

select date_trunc(     'second',      '2014-04-14 12:17:55.772'::timestamp - interval '2 seconds' );

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