Yes. Tap Later beside Where to?, or Reserve on the Services tab, and choose the date and pickup time in Georgetown time. The screen states how far ahead you can book and how much notice is needed. Under Upcoming on the Activity tab, tap Change to move the ride until a driver has taken it, or Cancel. See Schedule a ride for later.
Can I schedule a ride for later?
Yes. Tap Later or Reserve; change it until a driver takes it, cancel it any time.