declare @t table(d datetime)
insert @t values('2012-01-01 09:00'),('2012-01-01 10:00'),('2012-01-01 11:00')
select cast(d as time) from @t where cast(d as time) between '10:00' and '13:00'
declare @t table(d datetime)
insert @t values('2012-01-01 09:00'),('2012-01-01 10:00'),('2012-01-01 11:00')
select cast(d as time) from @t where cast(d as time) between '10:00' and '13:00'