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
German Unity Day the first Prussian coronation of the king, which should not fall into the shadow of a united German holiday." On 31 July 1919, the Weimar Constitution would be accepted in its form by the Weimar National Congress. In memorial of this "Hour of birth of democracy", the 11 August was created as Constitution Day, because the President of the Empire, Friedrich Ebert, signed the constitution on this day. Shortly after the Nazis took power in 1933 (the so-called "Machtergreifung"), May Day (1 May) was established as a national holiday in the "German Reich". It was already celebrated as a "Day