If you have pranksters for friends, please do not allow them to trick you into manually changing the date on your iPhone, iPad or iPod Touch to 1-1-1970. For some odd reason, there’s a bug within Apple’s framework that will prevent 64-bit iOS devices from booting up. This means your device will basically become a paperweight. Yeah, and trying to restore it from iTunes doesn’t solve the problem either.
Apple is investigating the issue, but in the meanwhile – refrain from setting your iPhone 5s, iPad, or iPod touch to 1-1-1970. That is unless you’re under federal investigation and think this is easier than fighting to turn over your encryption key.
Learn more about this issue here.