Subtract two dates in Microsoft SQL Server

SubtractTwoDates.sql

select CreatedDate , * from dbo_Customers 
where
(DATEDIFF(day, CAST(CreatedDate as date), GETDATE())) > 180

-- day is for the intervals, could be minute, hour.
-- using 180 days (6 months) for testing.
-- The CreatedDate is of type DateTime (datetime2).
-- using Table dbo_Customers

In C#

SqlFunctions.DateDiff("day", c.CreatedDate, SqlFunctions.GetUtcDate()) > 180