Setup so my new theme is applied and used at certain time.

I know that you can type a post up and change the timestamp to a time in the future and hit post, so that way you can have the post be active when that that time comes.

But lets say I have a new theme, and I want it to be applied in 4 days at exactly 12:00 Midnight, how would I go about making it so that would automatically happen? So that way I don’t have to stay up at that time, and make the change myself. Is there any way to auto task theme changes?