This Date Will Brick Your iPhone

If you set your iPhone's date to January-1-1970 and reboot it, your iPhone will be bricked.

You don't believe me? 

If you don't believe me, go head and pick up your iPhone. Then go to the Settings app, tap the General menu, choose Date & Time, and turn off the Set Automatically option. From there, you’ll have to scroll through the menu until it reaches as far back as it goes. After that, go back to the General menu then go back into the Date & Time settings and scroll backwards again. You'll have to repeat this process until you reach 1970.

Then set the date to January-1-1970. Now reboot it. Once you reboot, your device will not come back on.

Does it affects all the iOS devices?

This bug affects any iOS device that uses a 64-bit processor and is running iOS 8 or newer, including iPhones, iPads, and iPod touches. For those unsure, 64 bit processors are the A7, A8, A8X, A9, and A9X (iPhone 5s or later, for instance). If you use a 32 bit device, you're in the clear.

Here is the video showing the bug: