Determination of the day of the week day of the week begins by starting from an ‘anchor date’: a known pair (such as January 1, 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week. One standard approach is to look up (or calculate, using a known rule) the value of the first day of the week of a given century, look up (or calculate, using a method of congruence) an adjustment for the month, calculate the number of leap years
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.