National day Day may be celebrated any day between 15 April and 15 May. Another example is Thailand which celebrates the birthday of the king on 28 July. This date will change on the accession of the heir to the throne. Most national days can be categorized in two large blocks: Denmark and the United Kingdom are among the few countries that do not have designated national days (though Constitution Day has many of the same features of a national day in Denmark's case). Importance attached to the national day as well as the degree to which it is celebrated vary greatly
National Day of Sweden National Day of Sweden National Day of Sweden () is a national holiday observed in Sweden on 6 June every year. Prior to 1983, the day was celebrated as the Swedish Flag Day (). At that time, the day was renamed the Swedish national day by the Riksdag. The tradition of celebrating this date began 1916 at the Stockholm Olympic Stadium, in honour of the election of King Gustav Vasa in 1523, as this was considered the foundation of modern Sweden. Some question the validity of this as a national holiday, as it was not observed as a holiday until