Want to go back in time to Jan. 1, 1970? Just make sure you don't do it on your iPhone.
Changing the Date & Time settings to that fateful date will disable your device, Apple users report. And good luck trying to get it to restart: Connecting the disabled phone to your computer and trying to reboot it via iTunes won't work.
One chagrined user posted about his device's demise on an online Apple help forum:
"Hello, I was playing around with my Date & Time settings and I changed the time to January 1st 1970. I shutdown my phone and restarted it, the result is a bricked iPhone. I've tried restoring, updating, but nothing seems to be working."