SQL Server GROUP BY datetime ignore hour minute and a select with a date and sum value

Question

I have a table with two fields - datetime and int. I want to do a group by on the datetime only on the date ignoring the hour and minute.

Answer 1

-- I like this as the data type and the format remains consistent with a date time data type

;with cte as(
    select 
        cast(utcdate as date) UtcDay, DATEPART(hour, utcdate) UtcHour, count(*) as Counts
    from dbo.mytable cd 
    where utcdate between '2014-01-14' and '2014-01-15'
    group by
        cast(utcdate as date), DATEPART(hour, utcdate)
)
select dateadd(hour, utchour, cast(utcday as datetime)) as UTCDateHour, Counts
from cte