I have a column with a bunch of times in the "10:00 AM" format. In the next column I have corresponding sales for that time. I need to sum all the sales for each time period (i.e. 10:00 AM, 10:30 AM, 11:00 AM, etc.)

In a similar example, I used this formula with MONTH, but I can't figure out what to use for time values:
=SUM(IF(MONTH($C$5:$C$4244)=11,$I$5:$I$4244))

Thanks in advance.