Extracting hours from a DateTime (SQL Server 2005)

Question

I can extract the month and day by using Day(Date()), Month(Date()). I can\'t extract hours, with HOUR(Date()). I get the following er

Answer 1

select case when [am or _pm] ='PM' and datepart(HOUR,time_received)<>12 
           then dateadd(hour,12,time_received) 
           else time_received 
       END 
from table

works