Best approach to remove time part of datetime in SQL Server

Question

Which method provides the best performance when removing the time portion from a datetime field in SQL Server?

a) select DATEADD(dd, DATEDIFF(dd, 0, getdate(         


        

Answer 1

In SQL Server 2008, there is a DATE datetype (also a TIME datatype).

CAST(GetDate() as DATE)

or

declare @Dt as DATE = GetDate()