select *
from TicketItem
where s_item IN('Coffee', 'Espresso', 'Double Espresso', 'Decaf Espresso', 'Cappucino', 'Latte', 'Iced Coffee', 'sm coffee pot', 'lg coffee pot')
and dt_when >= dateadd(Quarter, datediff(quarter, 0, getdate()), 0)
and hour(dt_when) = 7

This query chokes on the 'hour' giving:
Msg 195, Level 15, State 10, Line 15
'hour' is not a recognized built-in function name.