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
German-American Day designating October 6, 1987, as German-American Day. It became when President Reagan signed it on August 18. A proclamation (#) to this effect was issued October 2, 1987, by President Reagan in a formal ceremony in the White House Rose Garden, at which time the President called on Americans to observe the Day with appropriate ceremonies and activities. Presidents since then have continued to make proclamations to observe German-American Day. German-American Day German-American Day () is a holiday in the United States, observed annually on October 6 under . German-American Day, which celebrates German American heritage, commemorates the date in