Her decision over the timing was relayed yesterday to the Council President, Donald Tusk, by Britain's ambassador to the EU, Sir Tim Barrow.
The Prime Minister's letter officially notifying the European Council of the UK's intention to quit under Article 50 of the EU treaties will set in train a two-year negotiation process expected to lead to Britain leaving the EU on March 29 2019.
Tusk said that meeting would strive to achieve "certainty, clarity for all: citizens, companies and member states".
But lawmakers have warned that her government must prepare for the risk they might fail - and for Britain to crash out of the European Union with no agreement in place.
Despite ministers warning that no deal is better than a bad deal, the Lords EU Internal Market Committee has warned of the risk of "serious harm" to Britain's non-financial service sector if the United Kingdom fails to hammer out a trade agreement with Brussels.
The Supreme Court ruled in January that May's government must obtain approval from the British parliament to trigger Article 50, prompting the introduction of emergency legislation.
Chief secretary to the Treasury David Gauke will preside over the Brexit liabilities which are asked for by the European Union once the negotiations begin.
But while Britain is keen to secure a free trade trade deal with the EU as part of the exit negotiation process, the European Council insists it won't discuss any such trade relationship until the United Kingdom agrees to an expensive separation fee.
Britain's Brexit Minister David Davis said that Britons had approved a "historic decision" to leave the European Union after four decades of membership.
The committee's report is entitled Brexit: justice for families, individuals and businesses? .
Opposition Labour leader Jeremy Corbyn said his party accepted the Prime Minister had a mandate to start the process of leaving the EU.
European airports on Tuesday called on Britain and the EU to agree a back-up plan for post-Brexit flying should they fail to agree a new relationship before Britain quits the bloc, saying a return to decades-old traffic rights deals should be avoided.
But Liberal Democrat leader Tim Farron, who is demanding a second referendum on when May agrees terms with the European Union, said: "Theresa May is embarking on an extreme and divisive Brexit".
There was no further detail about exactly what the letter would say at this point.
"No change in our position; we intend and expect to achieve this within a two-year timetable", he said.
Sky News reported last week than the Lords report said: "The UK's long-term prosperity after Brexit relies on safeguarding UK-EU trade in goods".
Mr Barnier said he hoped to begin the process of ratification by the European Parliament by October 2018.
Patty Murray, D-Wash., will vote against the Neil Gorsuch nomination, and join Democrats' filibuster in a bid to block the U.S. Pennsylvania's senior US senator has decided he will not back Judge Neil Gorsuch's nomination to the Supreme Court.
An additional surgery will certainly be another setback for Embiid, who proved outstanding during his belated rookie year. He sustained a bone bruise and partially torn meniscus, which the team initially said would not require surgery.
Singh said, "One of the norms mentioned in the licence is installation of CCTV cameras on the premises of the slaughter house". The BJP fought on a poll plank of shutting down illegal abattoirs, a move that was seen as hurting Muslim-run businesses.
Representative Mark Meadows , chairman of the conservative House Freedom Caucus, said on Sunday that he had not given up on reviving a Republican plan to repeal Obamacare before moving on to tax reform.
Back in 2010, he revealed to The Guardian that "Billboards" concerned a 50-year-old woman whose daughter is murdered. Frances McDormand (Oscar award-winning star of Fargo ) is a mean mother with a dead daughter and a violent attitude.
Wilson finished with 16 despite foul trouble and Allisha Gray acrobatically drove her way to 11 points for top-seeded SC (31-4). Reserve forward Luke Maye was a hero with his last-second jumper against an equally worthy Wildcats on Sunday night.
Rounding off the collection is a selection of SURTE, FLOALT and JORMLIEN door and light panels that range between £55 and £100. Now in a move into a slightly different section of the tech market IKEA are introducing their own line of smart light bulbs.
The section of proposed pipeline under Lake Oahe drew an estimated 10,000 people to camps nearby last November. He says the tribes believe they ultimately will convince a federal judge to shut down the pipeline.
Ads, powered by Twitter's Amplify video ad product, will work in a similar fashion to how ads already work in Twitter video. Live video is prized by advertisers for events that command outsized attention, such as sporting events or the Oscars.
In Omerga towns in Osmanabad , the party called for complete shutdown and also held motorcycle rallies in support of its leader. After every airline refused to book him a seat, the politician was forced to take a train.
Trump signs against U.S. efforts to combat climate change
US President Donald Trump on Tuesday signed an executive order rolling back Obama-era rules aimed at tackling global warming. In 2008 there were 88,000 coal miners in the United States, according to the US Energy Information Administration .
'Serial' team's seven-episode podcast is ready for binging
The show contains gestures toward the tension between the pains of the liberal intelligentsia and the pains of farmland country. That's what the "S" in S-Town stands for, as we learn in the opening moments of one of the year's eeriest new podcasts.
Drake Postpones Concert Due to Illness
The sushi put Drake's stomach in a sickly condition and unfortunately the Toronto MC was left with one choice-to cancel his show. Drake actually chose to postpone his concert in Amsterdam for the third time in three months.
1 dead, 15 injured in Cincinnati nightclub shooting
Someone was shot in the foot there on New Year's Day, and a shooting victim was found in the parking lot in September, WLWT said. A police auto blocks access to the scene of a mass shooting at the Cameo Nightlife club in Cincinnati , Ohio, US.
Guatemala: Fire kills 19 children at a shelter
A further 25 people were injured, suffering first, second and third-degree burns, and were taken to hospitals in Guatemala City. Overcrowding is a common problem in public institutions in Guatemala, including in particular prisons.