-- 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