Determination of the day of the week possible to do all the calculations in one's head with a little practice). None of the methods given here perform range checks, so unreasonable dates will produce erroneous results. Every seventh day in a month has the same name as the previous: "Corresponding months" are those months within the calendar year that start on the same day of the week. For example, September and December correspond, because September 1 falls on the same day as December 1. Months can only correspond if the number of days between their first days is divisible by 7, or in other words, if their
Labor Day such as school and sports begin about this time. In the United States, many school districts resume classes around the Labor Day holiday weekend (see First day of school). Many begin the week before, making Labor Day weekend the first three-day weekend of the school calendar, while others return the Tuesday following Labor Day, allowing families one final getaway before the school year begins. Many districts across the Midwest are opting to begin school after Labor Day. In the U.S. state of Virginia, the amusement park industry has successfully lobbied for legislation requiring most school districts in the state to