Queen's Day

Koningsdag
People dressed in orange on the canals of Amsterdam in 2010
Observed by	Kingdom of the Netherlands (Netherlands, Aruba, Curaçao, Sint Maarten)
Type	National holiday
Significance	Birthday of King Willem-Alexander of the Netherlands
Celebrations	Partying, wearing orange costumes, flea markets, concerts and traditional local gatherings
Date	27 April (26 April if 27 April is a Sunday)
Frequency	annual

Koningsdag (Dutch pronunciation: [ˈkoːnɪŋsˌdɑx] ( listen)) or King's Day is a national holiday in the Kingdom of the Netherlands. Celebrated on 27 April (26 April if the 27th is a Sunday), the date marks the birth of King Willem-Alexander.

Up until 2013, when Queen Beatrix abdicated and was succeeded by her son Willem-Alexander, the holiday was known as Koninginnedag (Dutch pronunciation: [koːnɪˈŋɪnəˌdɑx] ( listen)) or Queen's Day and was celebrated on 30 April.

The holiday was initially observed on 31 August 1885 as Prinsessedag or Princess's Day, the fifth birthday of Princess Wilhelmina, heir to the Dutch throne. On her accession in November 1890 the holiday acquired the name Koninginnedag, first celebrated on 31 August 1891. In September 1948, Wilhelmina's daughter Juliana ascended to the throne and the holiday was moved to Queen Juliana's birthday, 30 April. The holiday was celebrated on this date from 1949.