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 which the two parts of the community belonged before Belgian independence. A decree adopted on 1 October 1990 and published on 15 November 1990 prescribed the arms, the flag, the colours and the Community day, which was to be celebrated on 15 November. Here is an English translation of the original version of the decree: Article 1. The Day of the German-speaking Community shall be celebrated every year on 15 November. Article 2. The German-speaking Community shall bear the following arms: Article 3. The flag of the German-speaking Community shall be hoisted on 15 November on the official buildings of