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 the German-speaking area ("Gebiet") of Belgium; outside this area, it shall be hoisted on the buildings which, because of their use, are ascribed to the German-speaking Community or are temporarily put at its disposal. In the German-speaking area of Belgium, the flag shall be further hoisted on the administrative buildings under the same conditions and on the same days as the Belgian national flag. Source: Official website 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