The Birthday of His Majesty the King is observed in the UK on November 14, celebrating the actual birthday of King Charles III, who was born on this date in 1948. This occasion is marked by the flying of the Union Flag on all government buildings, making it a flag day. The tradition of celebrating the sovereign's birthday began in 1748 during the reign of King George II, and while the official birthday is celebrated with public festivities in June, the actual birthday remains significant. The event is also recognized as a public holiday in the Falkland Islands. King Charles III ascended the throne following the death of his mother, Queen Elizabeth II, in 2022, and he became the oldest person to do so at the age of 73.