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
The First Day on the Somme often quoted as the definitive tally for 1 July. Throughout the book Middlebrook uses quotations from soldiers involved in the fighting on the day, following ten men's stories. These men presenting a cross-section of the British Army of 1916 — Regular Army, New Army and Territorial Force — with ranks from privates up to battalion commander (lieutenant colonel). The First Day on the Somme The First Day on the Somme () is a First World War military history book by Martin Middlebrook, first published in 1971 and still in print, which is regarded as a seminal work in the field