-- Oracle:
SELECT TO_DATE('2012-12-10','YYYY-MM-DD')+7 FROM DUAL;
-- SQLServer:
SELECT convert(varchar(12),dateadd(day,7,cast('2012-12-10' as datetime)),23);
-- MySQL:
SELECT DATE_ADD(DATE_FORMAT('2014-10-10','%Y-%m-%d'),INTERVAL 7 DAY);
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