US President Donald Trump is to visit the UK on Friday July 13, after previously cancelling a trip amid claims he would face mass protests.
It will not be the full-blown state visit Mr Trump was promised when Prime Minister Theresa May visited the White House in January last year.
But an invitation to a state visit still stands, the BBC understands.
BBC North America editor Jon Sopel said he understood the president was likely to meet the Queen during the visit.
Mr Trump will hold talks with Mrs May, Downing Street said, with further details to be "set out in due course".
The prime minister said she was "looking forward to welcoming President Trump to the United Kingdom for a working visit on July 13".
'Unity over division'
The July date follows the Nato summit in Brussels which the president is expected to attend.
Downing Street and the White House hoped to co-ordinate releasing details of the trip, but Mr Trump's spokeswoman Sarah Sanders apparently let slip the information first.
UK ambassador Sir Kim Darroch confirmed the date on Twitter, saying he was "delighted" that Mr Trump would visit the UK.
Mr Trump cancelled a planned trip to London to open the new US embassy in Vauxhall earlier this year, complaining the move to an "off location" south of the Thames had been a "bad deal".
But critics said his decision may have been driven by a fear of protests.
Foreign Secretary Boris Johnson tweeted that it was "fantastic" news that Mr Trump would "at last" be visiting Britain.
Ben Harris-Quinney, chairman of the Bow Group, said: "A visit to London by the president is likely to draw major protests, crime and disorder, and we do not wish to see Britain or President Trump embarrassed by this.
"It is important that the people of the United States and its government know there are many in Britain who strongly support the president and the special relationship, and wish for President Trump to be afforded the warmest of welcomes.
"Sadly that will not be the case in London."
Theresa May was the first foreign leader to visit Mr Trump in the White House following his inauguration in January 2017.
She conveyed an invitation from the Queen for Mr Trump to come for a state visit - a formal occasion with much pomp and ceremony.
Mr Trump accepted the invitation but a date has yet to be set, amid speculation it has been postponed indefinitely.
Plans for a working visit to the UK in 2018 were announced when Mr Trump met Mrs May at the World Economic Forum in Davos in January.
BBC North America editor Jon Sopel said Mrs May would have lots of business to discuss with Mr Trump, from the framework of a future trade deal to his plans for tariffs on steel and aluminium.
But he added, after the high-profile visit by French President Emmanuel Macron to Washington DC this week - and with German Chancellor Angela Merkel flying in for a US visit on Thursday - the "optics" of such a visit were important and Britain would not want to get left behind..