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 in East Germany, even with the name "Day of the German Unity". Since 1963, it was proclaimed by the President of the Federal Republic as "National Day of Memorial of the German People". However by the mid-1960s as hope faded that the two Germanies would ever be re-united, this date became more of a holiday and opportunity to drink than a day to consider national unity. In the year 1990, the "Day of German Unity" was celebrated twice, on this date and on October 3. In East Germany, the Founding Day in 1949 would be celebrated on 7 October as