A simple bug in iPhone founded by Zach Straley on YouTube shows that if you set the time and date to January 1, 1970 will brick your iPhone.
The iOS device will fail to boot, stuck at display of Apple logo.
This glitch got lot of attention on reddit with people experimenting on their iPhone devices to see if it worked. This glitch works on any iOS device that uses a 64-bit processor and is running iOS 8 or newer, including iPhones, iPads, and iPod touches. To avoid this, simply let your iPhone automatically set the time.
For people who tried this for fun and got their iPhone bricked had to visit to their local Apple store and replace their iPhone under warranty.
Other way to fix this problem is to wait until the battery die and then plug the charger in iPhone and reset. You can see blue screen for about 3 seconds after few minutes. This worked for few people and didn’t work for others.