THIS is definitely for the 'don't try this one at home' department.

And more importantly don't tell you kids about it (though they probably already know).

A post has been doing the rounds on social media suggesting iPhone users set their system time to January 1, 1970 in order to see a retro Apple start-up screen.

The last line in the post should be taken literally: Be prepared for a wild ride.

According to numerous tech blogs and articles, doing what it says will actually kill your device, making it unable to boot.

It's even beyond saving with an iTunes restore.

According to Fairfax, the bug only affects devices with 64-bit chips, including, meaning iPhone 5S, iPad Air, iPad Mini 2 and iPod Touch 2015 and newer.

If you want to see what happens, YouTube user Zach Straley demonstrates what sending your iPhone back 46 years will do.

Tech website Ars Technica reports that the fault occurs because January 1, 1970, is the first day of Unix time.

Unix-like systems (such as the iPhone) keep track of the time in terms of the number of seconds that have passed since that first day.

Setting that value to zero, causes some serious issues for Apple devices.

Some online are saying the issue resolves itself once the internal clock progresses to a certain point, which differs depending on your time zone.

Others have reported that certain SIM cards will jump-start devices to life.

There's also a suggestion that completely draining the battery will help.

But the best idea is don't do it - or let you kids do it!