Truncate date to only hour / minute

Question

How do i trunc the date in sql server 2008 like this :

I have 2012-01-02 12:04:11.443 and I want only to select 2012-01-02 12:00:00.000 and

Answer 1

declare @D as datetime = '2012-01-02T12:04:11.443'

select dateadd(hour, datediff(hour, 0, @D), 0)
select dateadd(minute, datediff(minute, 0, @D), 0)