Determination of the day of the week ISO 8601. The day designated with 7 may also be counted as "0", by applying the arithmetic modulo 7, which calculates the remainder of a number after division by 7. Thus, the number 7 is treated as 0, 8 as 1, 9 as 2, 18 as 4 and so on. If Sunday is counted as day 1, then 7 days later (i.e. day 8) is also a Sunday, and day 18 is the same as day 4, which is a Wednesday since this falls three days after Sunday. The basic approach of nearly all of the methods to calculate the
Day of the German-speaking Community Day of the German-speaking Community The Day of the German-speaking Community is a holiday in Belgium celebrated on 15 November each year. It is a public holiday for the German-speaking Community of Belgium but it is not celebrated elsewhere in the country. The equivalents of the other communities are the Day of the Flemish Community (11 July) and the Day of the French-speaking Community (27 September). The ceremony coincides with the King's Feast. The German-speaking Community measures over 853 km (329 sq miles) in the Belgian region of Wallonia, and is made up of two territories consisting of nine municipalities.