Hotel transfers help needed?

i am going to turkey to see some family and will be using a transfers company for the first time-but i am not sure i have filled in the information for my pick up correctly and am hoping somebody more experienced can help me.i am flying back to the uk at 1.20am on the 10th of july and on the booking form i have put for Departure date in destination 9th of july as this is the day i need to head back to the airport.but do they need the day my flight departs or the day i want to go back to the airpot?thanks