BREXIT By facebooker_1031837527178190 Jun 23, 2016 Referendum in the United Kingdom Jun 24, 2016 Prime Minister David Cameron's upcoming resignation Jul 13, 2016 Theresa May as Prime Minister Mar 29, 2017 Brexit's notification letter Jun 19, 2017 Start of formal negotiations Dec 8, 2017 Start of the second phase of negotiations Nov 25, 2018 Validation of the agreement by EU leaders Jan 15, 2019 Rejection of the Agreement by the House of Commons Mar 12, 2019 Second rejection of Theresa May's agreement Mar 29, 2019 Third rejection of Theresa May's agreement Apr 11, 2019 Brexit postponed to October 31 May 23, 2019 Brexit Party victorious in European elections Jul 24, 2019 Boris Johnson as Prime Minister Oct 17, 2019 Announcement of an agreement between the UK and the EU Oct 28, 2019 EU approves further postponement of Brexit Jan 9, 2020 British MPs give green light to Brexit Jan 31, 2020 UK-EU divorce