The Prince of Wales will be officially announced as the UK's new monarch Saturday at 9pm (NZT).
Prince Charles automatically became King the moment following the death of his mother, Queen Elizabeth II.
READ MORE: Queen Elizabeth II dies aged 96
However there will be multi-stage process publicly announcing his new title of King Charles III.
The Accession Council, which is made up of senior Cabinet ministers, judges and leaders of the Church of England, and will meet, without Charles, at the State Apartments of St James's Palace in London at 9pm (NZT) to formally proclaim him as the new sovereign.
The Queen’s son, now king Charles III, led tributes to his “beloved mother”. (Source: 1News)
As the new monarch, Charles will then make a declaration and sign an oath to uphold the security of the Church in Scotland.
Then, at 10pm (NZT), an announcement, known as the Principal Proclamation will be publicly read out from the palace balcony overlooking Friary Court, by the Garter King of Arms.
READ MORE: Charles is the King - what happens next?
A second public proclamation will then be read out the City of London, at the Royal Exchange at 11pm (NZT).
Lastly, further proclamations declaring Charles as monarch will be read in Scotland, Northern Ireland and Wales at 11pm NZT on Sunday, September 11.
The Queen visited NZ 10 times during her reign. (Source: 1News)
Charles, at 73, is the oldest person to ever assume the British throne and will be the head of state for the UK and 14 other countries, including Australia, Canada, New Zealand and Papua New Guinea.
However, it may be months or even longer before Charles’ formal coronation. In Elizabeth’s case, her coronation came on June 2, 1953 -- 16 months after her accession on February 6, 1952, when her father, King George VI, died.
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Prince Charles Philip Arthur George was born November 14, 1948, in Buckingham Palace.
When his mother acceded to the throne in 1952, the 3-year-old prince became the Duke of Cornwall.
READ MORE: Key milestones in Queen Elizabeth's 70-year reign
He became Prince of Wales at 20.
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