February marks exactly 70 years since Queen Elizabeth II became a monarch.
Her Majesty took to the throne following the death of her father, George VI, on 6 February 1952 when she was just 25 years old.
The Queen spent her Accession Day this year privately on the Sandringham estate in remembrance of her dad.
But the unprecedented Platinum Jubilee celebrations won't commence until the summer.
Instead, the festivities will take place nearly four months after the anniversary, at the beginning of June.
Read more: New Queen's Jubilee 50p coin - how rare is it and how to know if you've got one
A four-day bank holiday weekend will take place from Thursday 2 June.
The late May bank holiday has been moved to the Thursday, with an additional bank holiday added on Friday 3 June to create a four-day weekend.
Pub opening hours are being extended to 1am, while celebrations will include a live gig at Buckingham Palace, a carnival pageant on the streets of London, Jubilee lunches, and the lighting of beacons across the world, reports Chronicle Live.
A nationwide royal bake off competition to design a Platinum Pudding dedicated to the Queen is under way, while The Queen’s Green Canopy project was launched to plant thousands of commemorative trees.
From May 12-15, more than 500 horses and 1,000 performers will stage a 90-minute piece of arena theatre called the Platinum Jubilee Celebration in Windsor.
Members of the armed forces, along with frontline police, fire, emergency services and prison service personnel will be awarded the Platinum Jubilee medal.
Meanwhile stamps, coins, souvenir chinaware and Royal Collection exhibitions will commemorate the occasion, while 39 towns are vying to win Jubilee city status.
A ‘Superbloom’ field of flowers will surround the Tower of London, with 20 million seeds being planted in the moat in the spring to be ready to bloom from June to September.
Here is what else is happening and when...
Thursday 2 and Friday 3 June
The traditional Trooping the Colour Parade for the Queen’s official birthday will take place on Horse Guards Parade to kick off the bank holiday on the Thursday.
The royals usually appear on the Buckingham Palace balcony and watch a flypast.
Just over 1,500 beacons will be lit across the UK and in Commonwealth capital cities, then, on the Friday, St Paul's Cathedral will host a service of thanksgiving for the Queen's reign.
Saturday 4 and Sunday 5 June
It's expected the monarch will attend the Epsom Derby on the Saturday.
That evening, the BBC Platinum Party at the Palace concert promises to feature some of the world’s biggest entertainment stars.
Sunday will see the Platinum Jubilee Pageant, where a dragon puppet larger than a double-decker bus, marching bands and circus acts will be seen on the streets of London.
Nicholas Coleridge, co-chairman of the pageant, called the Jubilee “something of a reopening ceremony for the United Kingdom, following a period of uncertainty and hardship, a catalysing moment of unity and fun”.
Meanwhile, more than 200,000 The Big Jubilee Lunches are expected to be staged across the UK.
The Jubilee celebrations have their own logo, a purple and platinum-coloured seal featuring a stylised crown, incorporating the number 70, created by university student Edward Roberts in a special competition.
Just how much the public will see of the Queen during the celebrations is yet to be confirmed by Buckingham Palace.
By then she'll be 96, and it's expected her family, in particular the Prince of Wales and the Duchess of Cornwall and the Duke and Duchess of Cambridge, will take up most of the official duties.
This Jubilee is poignantly her first without her beloved husband of 73 years the Duke of Edinburgh, who died only 10 months ago.
