Officially dating crossword
Wednesday, 2 September 1752, was followed by Thursday, 14 September 1752.Claims that rioters demanded "Give us our eleven days" grew out of a misinterpretation of a painting by William Hogarth.Instead of 12 days, only 11 were skipped, and the day of the week was repeated on successive days, because at the same time the International Date Line was moved, from following Alaska's eastern border with Canada to following its new western border, now with Russia.
Some more modern sources, often more academic ones, also use the "1661/62" style for the period between 1 January and 25 March for years before the introduction of the Gregorian calendar in England. Great Britain, Ireland and the British Empire (including much of what is now the eastern part of the United States) adopted the Gregorian calendar in 1752, by which time it was necessary to correct by 11 days.
This change was implemented subsequently in Protestant and Orthodox countries, usually at much later dates.