June 10 and 11 are the days earmarked for extra drinking time - the Queen’s official birthday, typically a given Saturday in June.
On her actual birthday, which is April 21, she will become the first living British monarch to reach the age of 90.
The big announcement came as David Cameron addressed MPs in the House of Commons for Prime Minister’s questions today.
He said: “We will be extending pub opening hours on the 10th and 11th of June to mark Her Majesty the Queen’s 90th birthday.”
The dates – a Saturday and Sunday – will see a weekend of national celebration which will see the Queen attend a Birthday Parade on the Saturday, and a Patron’s Lunch on Sunday.
Other birthday events include a four-day pageant from May 12-15, at Home Park in Windsor Castle.