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
Three-Day Week the Tories said they had all the answers?" The Conservatives ran against Labour Prime Minister James Callaghan who on his arrival back from a conference in Guadeloupe played down the crisis. The Conservatives' message prevailed, and Margaret Thatcher became prime minister. Their main campaign slogan was "Labour Isn't Working". Three-Day Week The Three-Day Week was one of several measures introduced in the United Kingdom by the Conservative Government to conserve electricity, the generation of which was severely restricted owing to industrial action by coal miners. The effect was that from 1 January until 7 March 1974 (also the same month