I have a query to fetch date diff between 2 datetime as :
SELECT DATEDIFF(DAY, @CreatedDate , GETDATE()) Ex : SELECT DATEDIFF(DAY, \'2013-03-13 00:00:00.00
Apparently you can subtract the number of days you want from a datetime.
SELECT GETDATE() - 1 2016-12-25 15:24:50.403