Queen Elizabeth II celebrates two birthdays a year - lucky for some.
Her real one is April 21, but it's officially celebrated on the second Saturday of June in the UK.
In the past, official celebrations to mark a King or Queen's birthday have been held on a day that isn't their actual birthday.
Why? It all comes down to the weather.
Summer is the only time for a proper parade and in the UK, the weather in June looks more promising.
New Zealand
New Zealanders celebrate the Queen's Birthday on the first Monday of June each year.
Queen's Birthday is a day off for the general population. Schools, government offices and most businesses are closed.
The tradition of the British monarch celebrating two birthdays stems back to 1748.
If a British monarch has a birthday that doesn't fall in the UK summer months, they can have a second official birthday.
According to Te Ara, until 1937, the actual birthday of the sovereign was celebrated. But it changed when George VI took the crown.
"George VI’s birthday was 14 December, but it was initially agreed to observe it on 9 June. The Sovereign’s Birthday Observance Act 1937 made the day of jubilation the first Monday of June, and this has continued during the reign of Elizabeth II."
Canada
Canada celebrates their Queen's birthday weekend on the last Monday of May.
Victoria Day is a federal public holiday in honour of Queen Victoria's birthday. It has since been celebrated as the official birthday of Canada's sovereign.
It's also informally considered to be the beginning of the summer season in Canada.
Australia
Australia celebrates their Queen's Birthday public holiday on the second Monday of June - but only in some states.
- Australia Capital Territory (ACT)
- New South Wales (NSW)
- Northern Territory (NT)
- South Australia (SA)
- Tasmania (TAS)
- Victoria (VIC)
Western Australia celebrates their own public holiday on the first Monday of June, so their Queen's Birthday public holiday is marked on the last Monday of September.
Queensland celebrates their Birthday of the Sovereign on the first Monday in October.
