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

This seems to work:

select [Rounded Time] =
    dateadd(mi,datediff(mi,0,dateadd(ss,30,a.DT)),0)

from
    (
    select dt = convert(datetime,'8:24:29.997')
    union all
    select dt = convert(datetime,'8:24:30.000')
    ) a

Results:

Rounded Time                                           
------------------------------------------------------ 
1900-01-01 08:24:00.000
1900-01-01 08:25:00.000

(2 row(s) affected)