Theresa May scheduled Brexit on 27th March

British prime minister Theresa May will trigger article 50 of the Lisbon Treaty, the formal notification of the United Kingdom’s intention to leave the European Union, on March 29th, a spokesman for the British leader said on Monday. 
More than 40 years after the UK joined the EU and nine months since it voted to quit it, Britain’s envoy to the bloc, Tim Barrow, informed EU President Donald Tusk on Monday of her plan to invoke Article 50 of the Lisbon Treaty, the mechanism for quitting that has never been used.

The EU is “ready to begin negotiations,” European Commission spokesman Margaritis Schinas told reporters in Brussels. Article 50 of the Lisbon Treaty sets out how an EU country might voluntarily leave the union. Article 50 says: “Any member state may decide to withdraw from the union in accordance with its own constitutional requirements.” It's the first time a country invokes article 50.

The loss of Britain to the bloc has created speculation that other states might decide to follow suit, something Juncker strongly disagreed with in an interview published on Sunday.
"They will all see from the UK's example that leaving the EU is a bad idea," Juncker told German newspaper Bild am Sonntag.

No details of the letter submitted to Tusk’s office were disclosed. EU leaders plan an initial response within two days before convening a summit to ratify guidelines for their chief Brexit negotiator, Michel Barnier.

The announcement comes a day after European Commission President Jean-Claude Juncker warned that other member states will "realize it's not worth leaving" the EU after they see the deal the UK gets.
Later this week, EU leaders will gather in Rome to mark the 60th anniversary of the Treaties of Rome, which established the European Economic Community – the initial forerunner to the EU. Mrs May is not attending the event.