Every year on the first Monday in June, New Zealand celebrates the Queen's Birthday Holiday. The date of the holiday differs from the real birthday of the reigning Queen Elizabeth II (April 21, 1926) and does not coincide with public holidays in other countries of the British Commonwealth.
Why is there such a discrepancy in dates? Everything is very simple - the reason for this was the weather conditions in England. So, to avoid inclement weather that threatened to spoil the festivities, even the English King Edward VII (Edward VII, November 9, 1841 - May 6, 1910) set his birthday to be celebrated at the beginning of summer. Since then, all English monarchs have done this.
Unfortunately, for New Zealand, located in the Southern Hemisphere, bad weather cannot be avoided. In June, winter begins here - usually in the form of long torrential rains. But, since the weather is far from being as depressing as in England, and also due to large public events in honor of the holiday, they did not change the date.