Wikipedia can explain it.
Britain and the British Empire (including the eastern part of what is now the United States) adopted the Gregorian calendar in 1752 by which time it was necessary to correct by 11 days. Wednesday, 2 September 1752 was followed by Thursday, 14 September 1752 to account for 29 February 1700 (Julian). Claims that rioters demanded “Give us our eleven days” grew out of a misinterpretation of a painting by William Hogarth.
I’m just surprised that they had linux in 1752!
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