Following is the chronology of Brexit as the UK is set to leave the European Union at 2300 GMT on Friday, more than three and a half years since the country voted for it in a referendum in 2016.
January 23, 2013: Prime Minister David Cameron promises an in-out referendum on EU membership if his Conservative Party wins the 2015 General Election.
May 7, 2015: The Conservatives make sweeping gains over the Labour Party and secure a majority in the House of Commons.
June 23, 2016: The UK votes in a crucial referendum to leave the EU with 52 per cent of the public supporting Brexit. David Cameron, resign as prime minister.
July 13, 2016 : Theresa May wins the Conservative Party leadership contest and becomes prime minister
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