But what will happen after the Halloween divorce from the EU? Here's everything you need to know.
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EU bosses agreed the new deadline after Theresa May's deal was defeated.
She was granted an extension until Thursday October 31 — Halloween — after lengthy talks with squabbling EU leaders in Brussels on April 10.
New Prime Minister, Boris Johnson, is intent on delivering Brexit on or before the deadline, and has warned MPs to prepare for a no-deal Brexit if a deal can't be reached.
Despite being dealt a major blow when the Lords approved legislation blocking a No Deal Brexit, the PM vowed he would "never" postpone Brexit's looming October 31 deadline.
The bill orders Mr Johnson to ask for a Brexit delay until January 31 next year if no agreement has been reached by October 19 and MPs do not back No Deal. It is expected to receive Royal Assent on Monday.
But BoJo wrote to Tory members saying he would not carry out Parliament's instructions to ask for another extension - saying he was only bound "in theory" by the law passed on Friday.
He added: "They just passed a law that would force me to beg Brussels for an extension to the Brexit deadline. This is something I will never do."
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Theresa May announced her resignation on May 24, 2019. after her leaving plan was rejected three
The departing PM met US President Donald Trump during his state visit to the UK in the final days before she stepped down.
As she told the nation she was stepping down, she added: "I will shortly leave the job that it has been the honour of my life to hold – the second female Prime Minister but certainly not the last.
"I do so with no ill-will, but with enormous and enduring gratitude to have had the opportunity to serve the country I love."
Boris Johnson was announced as her replacement on July 22 and became the official Prime Minster after Theresa May resigned to the queen on the afternoon of Wednesday July 23.
What has Boris Johnson said about Brexit?
The new Tory leader said he was "impatient" to get cracking with Brexit and the domestic agenda in the wake of his historic win.
In his first address, he said: "I think we know that we can do [Brexit] and that the people of this country are trusting in us to do it and we know that we will do it."
Boris said in March that he'd reluctantly back the prime minister's deal to prevent Parliament from "stealing Brexit".
Before this, he had resigned from his position as foreign secretary in July 2018 saying May was leading the UK into a "semi-Brexit" with the "status of a colony".
The new PM was clear that he objected to a "soft Brexit" adding the Brexit "dream is dying, suffocated by needless self-doubt."
What will happen next?
The Lords have approved legislation blocking a No Deal, which could force the Prime Minister to seek a three-month Brexit extension.
The legislation has been presented by Labour MP Hilary Benn, and has been signed by opposition leaders and recently-sacked Conservatives, including Alistair Burt and Philip Hammond.
It requires the Government to either reach a deal - or gain Parliament's approval for a no-deal Brexit by October 19.
If the Government does not do either by the October deadline, the legislation would then require the Prime Minister to write to the EU to request another extension.
The date for this extension, as suggested in the bill, would be 31 January 2020.
If the EU suggests another date then the legislation requires the Prime Minister to accept this - unless the Commons votes against the proposed date.
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https://www.thesun.co.uk/news/brexit/7803607/what-new-brexit-deadline-happening-what-happens-next/
