February 20, 2016: David Cameron announces the date for the referendum on leaving the EU.
June 23, 2016: Great Britain votes to leave the EU.
July 13, 2016: Theresa May becomes Prime Minister after overcoming Boris Johnson and Michael Gove's challenges.
March 29, 2017: woman May officially informs the EU that the UK is launching the Article 50 process to leave the bloc.
June 8, 2017: The Tories are losing their majority in the early elections that Ms. May called to strengthen her hand on Brexit. Ms. May manages to stay in power, supported by the DUP.
November 2018: Ms. May eventually concludes a resignation agreement with the EU that is approved by the cabinet – although Esther McVey and Dominic Raab are stepping down.
December 2018: Ms. May sees a vote of no confidence in her leadership triggered by Tory MP angry over her Brexit deal.
15.-16. January 2019: Ms. May loses the first Commons vote on her Brexit deal with a massive 230 votes. But she sees a Labor vote with no confidence in the government.
March 12, 2019: Despite optimizations after talks with the EU, Ms. May's deal is rejected for the second time with 149 votes.
March 29, 2019: Ms. May's deal is rejected for the third time with 58 votes.
May 24, 2019: Ms. May announces she will step down on June 7th, triggering a Tory leadership contest.
July 23rd to 24th, 2019: Mr Johnson wins the Tory leadership, becomes Prime Minister and eventually signs a new deal with the EU.
October 22, 2019: MPs approve of Mr Johnson's deal on second reading in a major breakthrough – but they are voting on his proposed schedule and vowing to try to change the bill later. The Prime Minister responds by pausing the legislation and calling for an election.
October 29, 2019: MPs will eventually vote for an election after the SNP and Lib Dems broke their ranks to vote in favor, which forced the Labor leadership to agree.
December 12, 2019: The Tories win an impressive 80 majority after vowing to complete Brexit during the campaign. Jeremy Corbyn's Labor is seeing its worst performance since 1935 after sitting on the fence over Brexit saying there should be a second referendum and he wants to stay neutral.
December 20, 2019: The reshaped Commons passes Mr Johnson's Resignation Act with a 124 majority.
January 9th: The EU Withdrawal Agreement Act has completed its Commons phase and has been sent to the House of Lords.
22nd of January: The EU Withdrawal Act completed its progress through Parliament after the Commons overturned peer-to-peer amendments and the Lords admitted defeat.
January 24th: Mr Johnson signs the ratified Withdrawal Agreement in another symbolic step.
January 29th: MEPs approve the withdrawal agreement from 621 to 49. Amid emotional scenes in Brussels, some hands join hands to sing a final refrain by Auld Lang Syne.
January 23, 11 p.m .: The UK is officially leaving the EU – although it will remain bound by the bloc's rules for at least 11 months during the transition period.
5. March: The first round of trade talks between the UK and the EU is concluded.
June 30th: Downing Street is opposed to the option to extend the Brexit transition period as Mr Johnson repeatedly insists that it will end on December 31, with or without a trade deal.
August 21: Michel Barnier says that after months of negotiating a standstill, talks have actually moved "backwards" as both sides admit that a deal seems unlikely.