Well, after being disappointed by the Scheduled Departure feature this morning, I investigated it a bit. Scheduled Departure is hard coded to complete charging at 6:00AM (it is even stated in the release notes).
The only thing you get with Scheduled Departure is cabin climate complete at the time you set in the settings. You cannot change the scheduled time to have charging complete.
I guess it is back to using the Stats app for a simulation of this function. Very disappointed in Tesla's implementation.