What happened April 2019 AD in United Kingdom

The first alternative offered was that if MPs rejected May's deal in the next week, Brexit would be due to occur by 12 April 2019, with, or without, a deal—or alternatively another extension be asked for and a commitment to participate in the 2019 European Parliament elections given.

Following the failure of the UK Parliament to approve the Withdrawal Agreement by 29 March, the UK was required to leave the EU on 12 April 2019.