The “King’s birthday” can mean two different things: King Charles III’s actual date of birth, and his official birthday used for ceremonies and public holidays in different countries.

King Charles III’s real birthday

  • King Charles III was born on 14 November 1948.
  • That date is sometimes called his actual or unofficial birthday, as opposed to the official one marked by parades.

King’s Official Birthday in the UK

  • In the United Kingdom, the King’s Official Birthday is celebrated in June , tied to the Trooping the Colour parade.
  • Recent official birthday dates in the UK have been mid‑June Saturdays, for example 15 June 2024 , 14 June 2025 , and 20 June 2026.

King’s Birthday as a public holiday (Australia & NZ)

  • In Australia , the King’s Birthday public holiday is usually the second Monday in June , but Queensland and Western Australia use dates in September or October instead.
  • In New Zealand , the King’s Birthday public holiday falls on the first Monday in June.

Other “King’s Day” examples

  • In the Netherlands , King’s Day (Koningsdag) is a separate event: it is celebrated on 27 April (or 26 April if the 27th is a Sunday) for King Willem‑Alexander’s birthday.

Quick recap

  • Actual birthday of King Charles III: 14 November.
  • UK “King’s Official Birthday” (Trooping the Colour): a Saturday in June (date varies by year).
  • Australia/NZ “King’s Birthday” public holiday: early June Monday in most places, with some Australian states using September/October instead.

If you say where you are (UK, Australia, NZ, Netherlands, etc.), the exact “King’s birthday” date for your country and year can be pinned down more precisely.