Q: I tried the retro theme on my phone and restarted it and it has been stuck on the white screen with the black apple for about 5 hours now. What's should I do?

Catoierogers,

If you changed the date to May 1970 or earlier and can’t restart your iPhone, iPad, or iPod touch - Apple Support

I set my iOS device to January 1, 1970...

another one bites the dust,

   another one bites the dust,

(key in appropriate music accompaniment)

Courcoul wrote:

 

another one bites the dust,

   another one bites the dust,

 

(key in appropriate music accompaniment)

Really? Do you have to put that in there?

Tell me: is there ANY sane reason why you would need to set a phone's clock to 1 Jan 1970 at this point in time and space?

No - I have little time to "play games" with my phone myself but I feel for some of these people - long ago I was taught that "pushing buttons never permanently harms a computer" - Guess it is time to revisit that

Here is the article for your situation.

If you changed the date to May 1970 or earlier and can’t restart your iPhone, iPad, or iPod touch - Apple Support