multiple criteria for calculations

I have a spreadsheet that I am trying to have automatically calculate a total based on certain criteria:
I want the amount under the per diem amount column W to return a value based on if P is entered in column V. If this is for partial it will depend on departure and arrival times. If departure is after 6:00 AM no breakfast per diem is paid, if departure is after 11:00 AM no lunch is paid. If arrival is before 2:00 PM no lunch. If arrival is before 7:00 PM no dinner. If the user enters a 1 or 2 in column U, 1 uses out of state per diem breakdown located in cells I38:I40. In state uses a 2 and is located in cells E38:E40.

Please Help