Resetting The Date Could Crash iPhones And iPads Permanently
A new bug in Apple’s mobile operating system iOS could cause iPhones or iPads to crash permanently — though it does require users to manually reset the date to January 1970.
The bug was first revealed in a video on YouTube by Zach Straley, which shows an iPhone 6 crashing simply by resetting the date. It takes quite a bit of scrolling in the Settings menu to reset the date as far back as January 1970 but once you do, and you reboot your iPhone, the device won't come back on.