One Direction have unveiled details of 1D day (Picture: ITV)

MetroOne Direction have unveiled details of 1D day (Picture: ITV)MetroHarry Styles, Zayn Malik, Louis Tomlinson, Liam Payne and Niall Horan will take over YouTube and Google+ this Saturday from 7pm till 2am as they celebrate themselves and their fans. '1D Day is all about giving back to our amazing fans for supporting us ...